A micro-bubble generating device, comprising:
- an adapter coupling head including a water inlet, a water outlet and a first air flow channel, and the first air flow channel disposed within the adapter coupling head is used to guide the external ambient air;
- an accelerating tube including a convex part forming in a front end of the accelerating tube, a concave part forming in a back end of the accelerating tube, a second air flow channel forming within the accelerating tube is connected to the first air flow channel and extending from the convex part to a middle section of the accelerating tube, a water flow channel forming within the accelerating tube and extending from the convex part to the middle section of the accelerating tube, an inner tube forming within the accelerating tube and extending from the middle section of the accelerating tube to the concave part, at least one opening forming on a wall of the accelerating tube and connected within the inner tube, and the convex part is connected with the water outlet to let the water flow channel form a route and the route is connected with the inner tube, the water flow channel contains an exit which is used to generate a first spiral water flow rotation around the outer wall of the accelerating tube and the first spiral water flows rotation passes through the at least one opening forming on the wall of the accelerating tube to generate an second spiral water flow rotation in the inner tube, the second spiral water flow rotation comprises a compressed air flow from the second air flow channel, a water flow direction from the exit of the water flow channel and an axis of the radial direction of a circular form a first angle and the first angle is between 0° and 180°, the number of the axis of the radial direction is equal to the number of the installation of the water flow channel;
- a venturi tube with a hollow shape and including a first inlet end, a front end section, a middle section, a back end section and a first outlet end, and the first inlet end is connected with the concave part of the accelerating tube, an internal diameter within the middle section is uniform, the internal diameter at the front end section becomes shrunken toward the middle section and the internal diameter within the back end section becomes shrunken toward the middle section;
- a conical net including a conical portion connected with the back end section and the conical portion having a plurality of cutting holes, the plurality of cutting holes ia used to cut the compressed air flow from the second air flow channel to form a plurality of micron bubbles;
- and
- a shell covering the adapter coupling head, the accelerating tube, the venturi tube and the conical net;
- wherein when the water sequentially passes the adapter coupling head, the accelerating tube, the venturi tube and the conical net, the water passing the water flow channel performs a first accelerating circular motion around an external wall of the accelerating tube, and flows to the inner tube from the at least one opening and performs a second accelerating circular motion within the inner tube.