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.

Example intelligent dishwashing systems and methods are described. In one implementation, a system includes an imaging system configured to capture at least one image of an article of dishware. A processing system analyzes the at least one image to determine a presence and a location of a stain on the article of dishware. Responsive to determining the presence of a stain, a cleaning system is configured to clean the location of the stain on the article of dishware.

A warewash machine includes a chamber with a wash zone and front, left and right access openings. At least one spray arm is disposed to spray liquid toward the wash zone. A multi-sided hood assembly includes movable front, left, right and top wall sections, and is movable between a lowered and closed position for washing and a raised open position for inlet and outlet of wares. A stationary chamber rear wall includes an outlet opening fluidly connected with a vapor extraction unit at a back side of the rear wall. The vapor extraction unit includes an enclosure with a condenser therein, wherein incoming water to the machine from a cold water input passes through the condenser, wherein the enclosure includes an air outlet to surrounding ambient environment and at least one air mover.

An air jet generator according to an embodiment of the present invention includes: an impeller which applies centrifugal force to washing water flowing in a forward direction; a decompression portion which decreases a pressure of the washing water that flows; an air suction portion which is opened to allow air to flow into the decompression portion; a pressing portion which increases pressure so as to crush the air introduced from the air suction portion; an air tap which has a plurality of holes so as to crush the air contained in the washing water that passed through the pressing portion; and a reverse spray nozzle which sprays the washing water toward the air tap in a reverse direction.

Provided are a dish washing machine capable of effectively removing garbage which remains at the bottom of a washing tub and a filter and a method of controlling the same. When washing water is sprayed from a nozzle while a vane is positioned at a reference position during a drainage operation, since a deflection angle of the vane is bent back and the washing water is strongly sprayed toward a rear wall of a washing tub, the washing water may form a fast and strong water current over a bottom plate of the washing tub, and the fast and strong water current may remove garbage which remains at a filter while flowing over the bottom of the washing tub. Also, even when an excessive amount of garbage is accumulated at a filter at a top end of a sump and blocks the filter during a washing operation such as preliminary washing, main washing, etc., the filter is automatically washed using a small amount of water, thereby eliminating inconvenience of a user to directly separate and wash the filter. Also, washing performance may be effectively improved by precisely determining whether degradation in washing performance caused by a poor circulation of washing water occurs due to a filter blockage or generation of bubbles.

A heavy duty washing apparatus for cleaning cooking substrates including hotplates and grills comprising: a. a self-contained housing allowing readily movability; b. a plurality of functionally interconnected stations for receiving supply of water, a chemical cleaning agent composition and a pressurised fluid; c. a pressurising station and a temperature conditioning station; d. a foam generator in the housing using controlling feeds from the plurality of interconnected stations and functionally engaging with the pressurising station and the temperature conditioning station for providing an effective chemical cleaning agent composition for conditioning one or more of the supply of water, the chemical cleaning agent composition and the pressurised fluid and e. a washing compartment adapted to receive one or more of the cooking substrates in a stackable substantially planar spaced array; wherein the effective chemical cleaning agent composition allows for cleaning over an effective cleaning time in a chemical, aerobic and physical manner cooking residues on the cooking substrates by retaining of said foam layer for a predetermined period in contact with the cooking surfaces, and rinsing the foam layer with preselected conditioned high temperature and/or pressurised water to remove chemical and food residues.

A turbidity sensor assembly for a dishwasher appliance is provided. The turbidity sensor assembly measures the turbidity of wash fluid in a manner similar to conventional turbidity sensors, but also includes an integral water level indicator. The water level indicator is an opaque buoyant ball that rises and falls with the water level to provide a water level indication that can be used to shut off the drain pump when the sump is empty. More specifically, when the water level drops below a predetermined level, the opaque ball blocks the transmission of light between the emitter and receiver of the turbidity sensor, thus indicating that the sump is almost empty. As a result, the pump operating during a drain cycle need only operate long enough to drain the sump, and this may be achieved without an additional measuring device or complicated control system.

A conveyor warewasher includes at least one spray zone with multiple nozzles for spraying liquid onto wares passing therethrough, the spray zone including a tank for collecting sprayed liquid. The tank includes a drain outlet at the bottom of the tank for draining of the tank and a drain stop movable between a drain outlet closed position and a drain outlet open position. A drain control assembly includes a drain actuator operatively connected to cause movement of the drain stop between the drain outlet closed position and the drain outlet open position, and the drain actuator is moved by a powered device.

An automatic dishwasher having a wash tub defining at least a portion of a wash chamber, a first sprayer mounted within the wash chamber for rotatable movement therein, a liquid flow path fluidly coupling the wash chamber to the first sprayer, a valve assembly located within the liquid flow path and having a valve element rotatable about a first axis of rotation and between at least first and second positions to selectively divert liquid in the liquid flow path to the first sprayer and a drive system.

A household dishwasher appliance includes a wash tub with a sump, an electrically powered pump in fluid communication with the sump, a piezo microphone mechanically coupled to a portion of the wash tub, and a controller operatively coupled to the electrically powered pump and the piezo microphone. The controller is configured to operate the electrically powered pump to drain wash fluid from the sump, receive an audio signal from the piezo microphone, and diagnose a clog condition of a drain hose by analyzing the audio signal.