The present disclosure relates to an intelligent positive and negative pressure system and an operation method therefor, and an intelligent positive and negative pressure electric appliance. The system comprises a positive and negative pressure intelligent fresh-keeping refrigerator, a positive and negative pressure intelligent washing machine, a positive and negative pressure dish washing and fruit and vegetable cleaning machine, a positive and negative pressure range hood, a positive and negative pressure baking and frying microwave oven, a positive and negative pressure fresh-keeping compartment container, a positive and negative pressure fresh-keeping warehouse, a positive and negative pressure disinfection machine, and a positive and negative pressure module cabinet. By means of the positive and negative pressure system, a fluid and a carried substance thereof are regulated and controlled by means of positive and negative pressure, so as to affect an object in a specific space in a targeted manner.

A dishwasher includes: a cabinet defining an external appearance of the dishwasher; a tub disposed in the cabinet to form a space where to wash dishes; a heat exchange module disposed between the tub and the cabinet to form a space in which external air flows, and configured to supply the external air to the tub; and a condensing module disposed between the heat exchange module and the cabinet and configured to perform heat exchange of air discharged from the tub with the external air flowing in the heat exchange module and discharge heat-exchanged air to an outside of the cabinet.

A dishwasher includes: a cabinet defining an external appearance of the dishwasher; a tub disposed in the cabinet to form a space where to wash dishes; a heat exchanger disposed between the tub and the cabinet to form a space in which external air flows; and a condensing module disposed between the heat exchanger and the cabinet and configured to exchange heat of air discharged from the tub with the external air flowing in the heat exchanger such that the heat-exchanged air flows into the tub.

A warewash machine for washing wares includes a chamber for receiving wares, the chamber having at least one wash zone with an associated spray system for spraying liquid onto wares passing therethrough, wherein a downstream drying zone includes a blower for blowing air onto wares passing therethrough. The blower includes an ambient intake operatively connected to an ambient air flow path, a machine intake operatively connected to an internal machine air flow path and an exhaust intake operatively connected to a machine exhaust air flow path.

A dishwasher includes: a cabinet defining an external appearance of the dishwasher; a tub disposed in the cabinet to form a space where to wash dishes, and having an exhaust hole formed on an upper surface of the tub; and an external air flow unit forming a flow path, along which external air is introduced and discharged, and having an inflow hole formed above the exhaust hole to communicate with the tub, wherein the external air flow unit takes a shape in which a cross-sectional area of the flow path decreases in an upstream side of the inflow hole in a flow direction of the external air and increases in a downstream side of the inflow hole.

A dishwasher, a door assembly for the dishwasher and a method of drying the dishware in the dishwasher are provided. The dishwasher may include a tub portion adapted to hold dishware. The dishwasher may also include a duct having an inlet proximate to the top of the tub portion. The duct may be configured to receive warm air and vaporized water from within the tub portion. The dishwasher may further include a single blower configured to direct the warm air and vaporized water into the duct during a drying cycle. The blower may be configured to operate in a cyclic manner. In various embodiments, the blower may be configured to operate in a reverse direction for at least a portion of the drying cycle.

Strategies for providing aesthetically acceptable ventilation for appliances requiring ventilation are described. In one or more implementations, a notch is cut along the upper edge of a cabinet toe kick to allow ambient air to enter and exit an air cavity disposed behind the toe kick. A fence or trim piece is then installed in front of the notch to hide the notch from view and to create a labyrinth vent allowing ambient air to enter and exit the air cavity. This ambient air flow is required for proper operation of appliances requiring ventilation.

A distribution cap is configured to couple to a nozzle of a dish washer and to guide air from the nozzle to be discharged in a discharge direction. The distribution cap includes a fitting pipe configured to couple to the nozzle, a first bypass pipe that is connected to the fitting pipe and extends in a direction different from the discharge direction, where the first bypass pipe is configured to be positioned above the nozzle based on the fitting pipe being coupled to the nozzle, and a second bypass pipe that extends from an end portion of the first bypass pipe in the discharge direction, where the second bypass pipe defines a discharge opening at an end portion thereof.

A dishwasher is provided including a washing chamber with a sump and a hydraulic arrangement. The hydraulic arrangement may include the sump, a circulation pump, one or more spray arrangements, and a washing liquid storage tank. The circulation pump may include an inlet and a first outlet, the inlet being connected to the sump and the first outlet being connected to the one or more spray arrangements, wherein the circulation pump may be arranged to pump washing liquid from the sump to the one or more spray arrangements via the first outlet. The circulation pump may include a second outlet connected to the washing liquid storage tank wherein the circulation pump may be further arranged to pump washing liquid from the sump to the washing liquid storage tank via the second outlet.

A dishwasher is disclosed. When the dishwasher performs a drying process, the dishwasher increases a temperature of a washing space before air inside the washing space is discharged, thereby maintaining the temperature of the washing space at an appropriate drying temperature and increasing efficiency of the drying process.