Fountain core and fountain device having fountain core

A fountain device comprising:

• a fountain core (100) comprising:
• a hydraulic portion (110);
• and
• a power supply (120) for providing power to the hydraulic portion (110),
• wherein the hydraulic portion (110) comprises:
• a water pump to pump an amount of water from a water inlet (110a) at a lower portion of the hydraulic portion (110) and spray the water via a plurality of water spouts (1311) at an upper portion of the hydraulic portion (110) to form a water spray;
• and
• a floating portion (200) that is inflatable and foldable configured to cause the fountain device to float on a water surface when the floating portion (200) is inflated,
• wherein the floating portion (200) comprises a core mounting hole (240) that holds the fountain core (100), so that the fountain core (100) can form the water spray by the hydraulic portion (110) in a state that the fountain device floats on a water surface,
• wherein the plurality of water spouts are arranged on a top surface of the fountain core (100) in such a manner as to form at least two water spraying groups located at least two concentric circles with radii different from each other respectively, wherein the at least two concentric circles form at least one inner concentric circle and at least one outer concentric circle arranged in an outwardly radial direction,
• wherein the water spouts, which are located at the at least two concentric circles are arranged to be staggered from each other along a circumferential direction of the at least two concentric circles, and
• wherein the water spouts are configured to produce a disordered movement of the fountain device in a horizontal direction on the water surface.