Dishwasher

A dishwasher comprising:

• a tub that defines a washing space;
• a sump disposed below the tub and configured to store washing water received from the tub;
• a pump configured to supply the washing water stored in the sump to the washing space;
• and
• a spray arm rotatably disposed in the tub or the sump and configured to discharge the washing water from the pump into the washing space,
• wherein the spray arm comprises:
• a first blade that defines a spray channel configured to carry the washing water, the first blade being configured to spray the washing water into the washing space, and
• a second blade that defines a bubble generating channel configured to generate microbubbles in the washing water, the second blade being configured to supply the washing water including the microbubbles to the washing space, and
• wherein the second blade comprises:
• an upper wall that faces upward,
• a lower wall that faces downward, and
• a side wall that connects the upper wall and the lower wall to each other, the side wall defining a first discharge hole configured to discharge the washing water including the microbubbles to the washing space.

A dishwasher comprising:

• a tub that defines a washing space;
• a sump disposed below the tub and configured to store washing water received from the tub;
• a pump configured to supply the washing water stored in the sump to the washing space;
• and
• a spray arm rotatably disposed in the tub or the sump and configured to discharge the washing water from the pump into the washing space,
• wherein the spray arm comprises:
• a first blade that defines a spray channel configured to carry the washing water, the first blade being configured to spray the washing water into the washing space,
• a second blade that defines a bubble generating channel configured to generate microbubbles, the second blade being configured to supply the washing water including the microbubbles to the washing space, and
• a hub that defines a supply channel configured to supply the washing water discharged from the pump to the spray channel or the bubble generating channel,
• wherein the spray arm defines a vertical hole that is opened in an up-down direction,
• wherein the second blade comprises an inner side wall that surrounds the vertical hole, and
• wherein the bubble generating channel comprises:
• a connection channel disposed at an upstream end portion of the inner side wall and connected to the supply channel,
• a buffer chamber connected to the connection channel, the buffer chamber defining a first channel width that increases toward the upstream end portion of the inner side wall,
• a pair of air intake channels that are connected to the buffer chamber and arranged along the inner side wall,
• a discharge channel connected to each of the pair of air intake channels, the discharge channel defining a second channel width that increases toward a downstream end portion of the inner side wall, and
• a first discharge hole defined at the downstream end portion of the inner side wall and configured to discharge the washing water including the microbubbles from the discharge channel to an outside of the spray arm.