Browse Prior Art Database

Hot-Air Nozzle Assembly

IP.com Disclosure Number: IPCOM000119842D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 3 page(s) / 65K

Publishing Venue

IBM

Related People

Poteran, CC: AUTHOR [+2]

Abstract

This device is used for the assembly of a double-sided card edge connector to a fully populated, printed circuit card. Two hot-air nozzle assemblies are required for a one-step soldering operation.

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This is the abbreviated version, containing approximately 100% of the total text.

Hot-Air Nozzle Assembly

      This device is used for the assembly of a double-sided
card edge connector to a fully populated, printed circuit card. Two
hot-air nozzle assemblies are required for a one-step soldering
operation.

      Air enters the manifold 1 and flows into a stainless steel tube
2 (Fig. 1).  Stainless steel tube 2 is surrounded by a "C"-shaped
quartz tube 3 (Fig. 2).  Quartz tube 3 is used to minimize heat
transfer losses.  As air flows through the tube 2, it is partially
diverted by baffles (Fig. 4).  A portion of the air in the tube is
directed toward the nozzle 7, while the rest continues flowing
through the tube until it reaches a concave plug 4 (Fig. 5).  Once
the air hits the plug 4, it is directed back over the tube 2 (Fig.
5) as well as downward.  The air reaches the nozzle 7 where it is
guided downward through the exit holes (Fig. 3).  The combination of
tube 2 (Fig. 1), plug 4 (Fig. 5), and nozzle 7 (Figs. 2 and 3)
working together results in a square-shaped temperature profile as
well as even air flow over the entire length of nozzle 7 (Fig. 1).
Isolation bar 6 (Figs. 1 and 2) and insulation 5 (Figs. 1 and 2)
reduce heat transfer through the top of the assembly.  This protects
the actuation mechanism from heat damage and prevents heat transfer
losses.