Coupling assembly for pipe branching

A coupling assembly comprising:

• an inflow pipe comprising a branch hole for branching of an introduced fluid;
• a branch pipe in communication with the inflow pipe so that the fluid branched off through the branch hole flows;
• and
• a coupler connecting the inflow pipe and the branch pipe,
• wherein the coupler includes a body covering a circumference of the branch hole and comprising a guide rib inserted into the branch hole and a gasket disposed between the body and an outer circumferential surface of the inflow pipe, the gasket comprising a base pressed by a pressing surface of the body to prevent leakage of the fluid being branched off,
• wherein a degree of pressurization against the gasket by the body increases in a direction away from the branch hole,
• wherein the gasket comprises a reinforcement protrusion extending in an axial direction of the branch pipe,
• wherein the reinforcement protrusion comprises one or more expansion grooves extending in a circumferential direction of the branch hole and one or more supply passages configured to guide the fluid so that the fluid is introduced into the one or more expansion grooves,
• wherein the one or more expansion grooves comprise a first expansion groove provided on a side surface of the reinforcement protrusion and open in a radial direction of the branch pipe, and a second expansion groove provided on an upper surface of the reinforcement protrusion and open in the axial direction of the branch pipe,
• wherein the one or more supply passages comprise a first supply passage configured to guide the fluid so that the fluid is primarily introduced into the first expansion groove and a second supply passage configured to guide the fluid so that the fluid is introduced into the second expansion groove after the fluid is introduced into the first expansion groove, and
• wherein the first supply passage and the second supply passage are sequentially arranged along the axial direction.