Rotatable water pipe joint and assembly method thereof

A rotatable water pipe joint, comprising:

• An outer adapter having a cylindrical shaft rotating cavity;
• An inner adapter pivotably disposed within the shaft rotating cavity of the outer adapter;
• and
• A rolling assembly arranged between the outer adapter and the inner adapter, the rolling assembly being sleeved on the outer side of the inner adapter and being positioned on the inner side of the outer adapter, and reducing friction between the outer adapter and the inner adapter in a rolling manner;
• wherein the outer adapter comprises an outer sleeve, a sleeve fixing end, and a sleeve extending end, wherein the sleeve fixing end integrally extends outward along an axial direction from one end of the outer sleeve, and the sleeve extending end integrally extends outward along the axial direction from the other end of the outer sleeve, wherein a fixed accommodating cavity is formed at an outer side of the outer sleeve by the sleeve fixing end, and an extended accommodating cavity is formed at the outer side of the outer sleeve by the sleeve extending end;
• wherein the inner adapter comprises an inner shaft barrel, a connecting end, and a boss, wherein the connecting end integrally extends outward from one end of the inner shaft barrel along an axial direction of the inner shaft barrel, and the boss integrally extends outward from the other end of the inner shaft barrel along the axial direction of the inner shaft barrel, wherein the inner shaft barrel is sleeved on an inner side of the outer sleeve, wherein the boss is located in the fixed accommodating cavity, and wherein the connecting end protrudes from the sleeve extending end of the outer adapter to an exterior of the extended accommodating cavity;
• further comprising a limiting ring disposed at an end of the inner shaft barrel inside the sleeve extending end of the outer adapter for limiting displacement of the inner adapter along a rotation axis;
• and
• wherein the rolling assembly comprises:
• (a) a first ball set located in the fixed accommodating cavity, the first ball set being disposed (i) axially between the boss and said one end of the outer sleeve, and (ii) radially between an outer diameter surface of the inner shaft barrel and an inner diameter surface of the outer sleeve;
• and
• (b) a second ball set located in the extended accommodating cavity, the second ball set being disposed (i) axially between the limiting ring and the other end of the outer sleeve, and (ii) radially between the outer diameter surface of the inner shaft barrel and the inner diameter surface of the outer sleeve.