A dishwasher in one embodiment is provided with a spray arm, and the spray arm is provided individually with areas configured to spray water to a first spray area and a second spray area, and sprays water to the first spray area to entirely wash objects to be washed accommodated in the dishwasher and sprays water to the second spray area to wash objects to be washed with remaining contaminants by applying a great impact on the object to be washed with remaining contaminants.

The present disclosure relates to a dish washer having a heat pump, and the dish washer may include a washing tank having an accommodation space for storing dishes therein; an injection arm disposed inside the washing tank, and provided with a plurality of nozzles to inject washing water or air to the dishes according to a washing stroke and a drying stroke; a duct unit that defines a passage for delivering air to the injection arm; a suction fan that suctions the air and supplies the air to the injection arm; and an air heating element provided inside the duct unit to heat the air to be supplied to the injection arm, wherein the injection arm is rotatably mounted about a rotary shaft, and the plurality of nozzles rotate the injection arm by a pressure that injects the air.

A nozzle assembly and a dishwasher having the same. The dishwasher includes a main body, a wash tub, and at least one first nozzle assembly to wash the objects received in the wash tub. The first nozzle assembly includes a main nozzle configured to be rotatable about a rotation axis thereof, plural injection holes, a first flow path defined in the main nozzle for movement of wash water to be sprayed out toward the objects, a sub nozzle provided at the main nozzle, the sub nozzle internally defining a second flow path for movement of wash water to be sprayed out in a radial direction of the main nozzle, and a valve coupled to the main nozzle to open or close the second flow path. Providing the nozzle assembly with the first and second flow paths independent of each other may reduce noise due to collision of wash water.

A dishwasher for treating dishes according to an automatic cycle of operation includes a tub at least partially defining a treating chamber with an access opening, a sump fluidly coupled to the tub, and a liquid recirculation circuit fluidly coupling the sump to the treating chamber. The liquid recirculation circuit includes at least one rotating spray tube having a longitudinal body axis defining a rotational axis. A plurality of spray nozzles are provided in the rotating spray tube.

Disclosed herein is a dish washing machine. The dish washing machine includes a washing tub in which dishes are stored, a nozzle provided at one side of the washing tub to spray washing water, a vane configured to move in the washing tub and deflect the washing water sprayed from the nozzle toward the dishes, a vane holder movably combined with a rail configured to guide a movement of the vane and configured to support the vane, a driving source configured to generate power for driving the vane to reciprocate, a belt driven to transfer the power generated by the driving source to the vane, and a direction changing member with one end configured to rotate with respect to the vane holder and another end configured to rotatably move with the belt when a movement direction of the vane is changed.

Spray arm assemblies for dishwasher appliances are provided. A spray arm assembly includes a first spray arm. The first spray arm includes an arm member, the arm member defining an interior and a plurality of apertures in fluid communication with the interior. The arm member further extends along and is rotatable about a longitudinal axis. The spray arm assembly further includes a central housing defining and rotatable about a central axis, the central axis generally perpendicular to the longitudinal axis. In some embodiments, the spray arm assembly further includes a bevel drive assembly disposed within the central housing. The bevel drive assembly is configured to rotate the arm member about the longitudinal axis when the central housing rotates about the central axis. The bevel drive assembly includes a drive member, an axle member, and an idler member, the axle member mounted to the arm member.

A system and method for cleaning a dish, comprising: capturing at least one image of said dish using at least one camera; computing a bounding polygon for a dirty region in said image, wherein said dirty region is a region of said dish containing unwanted material that needs to be removed; computing a three dimensional representation of said bounding polygon by estimating three dimensional locations of multiple points within said bounding polygon; computing a spray pattern within said three dimensional representation of said bounding polygon such that the spray pattern substantially covers all regions of said three dimensional representation; and spraying a fluid on said dirty region of said dish with a nozzle, wherein said nozzle is reoriented or relocated such that said fluid reaches at least one location within said three dimensional representation of said bounding polygon according to said spray pattern, whereby dirty regions of said dish are targeted for a fast and efficient cleaning of said dish.

A dishwasher may include a tub configured to accommodate one or more items to be washed, a spray arm rotatably mounted to the tub, and configured to spray water onto the one or more items to be washed, a sump disposed at a bottom surface of the tub and configured to store water and to supply stored water to the spray arm, a fixed gear unit fixed to the tub with gear teeth arranged along an outer circumferential surface of the fixed gear unit, a rotary gear unit rotatably mounted on the spray arm and configured to engage the gear teeth of the fixed gear unit, and a link member connected to the rotary gear unit and the spray arm, where the spray arm may include, a main arm with a pair of arms, and a pair of auxiliary arms rotatably connected to the main arm.

A spraying apparatus and a dish-washing machine. The spraying apparatus comprises: a spraying pipe, a water injection nozzle being provided on the spraying pipe; a drive mechanism, the drive mechanism comprising a driving gear and a driven gear engaging with the driving gear, and the driven gear being connected to the spraying pipe to drive the spraying pipe to rotate; a driving mechanism, the driving mechanism being connected to the driving gear to drive the driving gear to rotate. The rotation of the spraying pipe in the spraying apparatus is stable and reliable, and control precision of a spraying region is high.

A system and method for cleaning a dish, comprising: illuminating said dish with a light source; capturing an image of said dish with a camera; inspecting said image to determine if said dish is clean; and estimating locations of dirty regions on said dish; spraying a fluid with a first nozzle on said dish with a predetermined spray distribution, wherein said first nozzle can reorient or relocate to spray said fluid on any region of said dish visible in said image; and spraying a fluid with a second nozzle on said dish with a spray distribution having a smaller coverage than that of said first nozzle, wherein said second nozzle is relocated or reoriented such that the fluid reaches said dirty regions at said locations on said dish; whereby dirty regions of said dish are targeted for a fast and efficient cleaning of said dish.