Vapor Phase Fountain for Component Rework
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18
The Vapor Phase Fountain uses the latent heat of vaporization of a liquid to transfer heat rapidly into individual components, which then asymptotically approach a temperature equal to that of the vapor. The maximum temperature of that component and associated hardware is, therefore, determined by the choice of liquid used to generate the vapors. The vapors in turn will melt the solder and allow the component to be reworked. The fountain 11 consists of a reservoir which contains heaters 12 submersed in the working fluid. A funnel 13, partially fabricated from or lined with a relatively poor heat conductor, is placed on top of the reservoir. A set of cooling coils 14 are attached inside the reservoir or funnel 13. Coils 14 are water-cooled and prevent vapor loss once the rework cycle has been completed.