Heat-driven pump

A heat-driven pump for transporting liquid by a function of bubbles produced by vaporization and condensation of the liquid under heating, said pump comprising:

• a liquid charging portion having a sequence of an inlet pipe, an inlet-side check valve, and a charging pipe;
• a bubble forming portion connected to said liquid charging portion for vaporizing and condensating the liquid;
• and
• a liquid discharging portion connected to said bubble forming portion and having a sequence of a discharging pipe, an outlet-side check valve and an outlet pipe;
• said bubble forming portion comprising:
• a vapor-liquid exchange chamber formed between said charging pipe and said discharging pipe by expanding the cross section of said pipes to have a volume greater than the possible maximum volume of a bubble in said chamber;
• and
• a heating portion fixed to only one side of said vapor-liquid exchange chamber for receiving heat supplied from outside and having a liquid cavity therein which communicates with said vapor-liquid exchange chamber;
• a bubble being generated and developed to drive the liquid to cause the interface of the bubble and liquid to be moved along the internal surface of said liquid cavity to form a thin liquid layer on the internal surface of said liquid cavity to realize a vaporization from said thin liquid layer, wherein the developed bubble is expanded by the received heat into said vapor-liquid exchange chamber, a corresponding volume of liquid in said vapor-liquid exchange chamber is accordingly discharged, the expanded bubble is displaced upwardly by buoyancy exerted on the bubble to cause a deformation of the bubble, an amount of new liquid is introduced into said liquid cavity, and said bubble is eliminated by cooling by said introduced new liquid, so that a successive pumping of the liquid is carried out.