Micro bubble generating device

A micro bubble generating device, disposed at one end of a liquid supply device, the micro bubble generating device comprising:

• a water inlet unit, comprising at least one first passage penetrating the water inlet unit, and a side of the water inlet unit penetrated by the first passage being provided with a first connecting surface;
• a water outlet unit, comprising at least one second passage penetrating the water outlet unit, a side of the water outlet unit penetrated by the second passage being provided with a second connecting surface, the second connecting surface facing the first connecting surface, wherein the water inlet unit is disposed on the water outlet unit, and the second passage communicates with the first passage;
• an air inlet groove, formed between the first connecting surface of the water inlet unit and the second connecting surface of the water outlet unit, and the air inlet groove comprising a third passage and a first accommodating chamber circumferentially disposed around the third passage;
• and
• a first sleeve, disposed at a side of the water outlet unit opposite to the second connecting surface, the first sleeve being formed with a first side wall parallel to a first direction, an end of the first sleeve being formed with a first flange parallel to a second direction, and the first direction being orthogonal to the second direction;
• wherein the first connecting surface and the second connecting surface partially abut against each other;
• and
• wherein the first accommodating chamber has a first spacing between the first connecting surface and the second connecting surface, the third passage has a second spacing between the first connecting surface and the second connecting surface, and the first spacing is different from the second spacing.