Liquefaction promoting apparatus having vibrable and oscillable spring

A liquefaction promoting apparatus to be disposed on a pipeline of a heat pump system for the purpose of stirring and uniformly mixing fluid containing refrigerant and refrigerator oil circulating therein comprising:

• a cylindrical housing having a body part, and an upper and a lower dome-shaped end plates each sealing the upper and the lower end of said body part;
• an upper tube having one end connectable to the pipeline and the other end penetrating said upper dome-shaped end plate at a distant position from the central axis and extending to the periphery of the upper end of said body part, allowing the fluid to flow therethrough;
• a lower tube having one end connectable to the pipeline and the other end penetrating said lower dome-shaped end plate in the vicinity of the central axis and extending to the periphery of the upper end of said body part, allowing the fluid to flow therethrough;
• a large coil spring with a diameter 1 to 10 mm smaller than the inner diameter of said body part which is accommodated coaxially in said body part, the large coil spring having its upper and lower ends fixed thereon and its middle part unfixed so as to be vibrable and oscillable;
• wherein the middle part of said large coil spring is allowed to vibrate and oscillate by kinetic energy of the flowing fluid, thereby stirring the fluid.