| 摘要 |
PURPOSE:To enable circulation of heat medium without utilizing a pump or the like by installing non-return valves at the outlet and inlet of a heating tank respectively and utilizing heating of the heat medium in the tank. CONSTITUTION:When the heat medium in a heating tank 1 is heated by heating means 2 consisting of an electric heater or the like, internal pressure in tank 1 is increased due to thermal expansion of the heat medium, thereby a non-return valve 7 is opened to discharge the heat medium into a return path 4. When the liquid level of an expansion tank 6 rises and a predetermined value of liquid level is attained, heating of heating means 2 is stopped by detector 9 or 10. Owing to this operation, internal pressure of tank 1 is decreased and existing heat medium from tank 6 to tank 1 flows to the direction indicated by arrows in the attached figure by liquid pressure in expansion tank 6, and opens non-return valve 8 and thus heat medium flown through radiator 3 will flow into heating tank 1. Operation described above is repeated and heat medium is circulated toward the direction indicated by arrows in the figure attached herewith. |
