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US 4,054,239 AGranted
Process for fabricating a heat exchanger
AssigneeCarrier Corporation
InventorJames J. Watson, Jr.
Life of this patent
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Abstract
An ultrasonic dip soldering process for bonding the tubular joints of a heat exchanger made up of tubular components joined together to form flow circuits within a fan coil. The joints are positioned adjacent to one of the tube sheets of the fan coil structure and the joints preheated by means of a remote heating process. The joints are then immersed in a molten bath of solder and treated to ultrasonic energy while in the bath.
Claims9
In the fabrication of a heat exchanger wherein a number of tubular components are joined together to form flow circuits within a fan coil, the process of joining the components comprising
- providing telescoped socket joints between the tubular components positioned adjacent to at least one tube sheet of the fan coil,
- directing a high speed jet of flammable gas at the tube sheet whereby the jet is redirected by the tube sheet to form a blanket of gas about the outside of the tubular joints,
- maintaining the speed of the jet traveling between its source and the tube sheet at a velocity sufficient to prevent the gas from mixing with ambient air and thus being ignited,
- igniting the blanket formed at the tube sheet to heat the joints within the blanket region to a predetermined temperature,
- immersing the preheated joints in a bath of liquid solder, and
- exposing the bath to ultrasonic energy while the joints are immersed therein.
3 more elements
Dependencies are inferred from the claim text.