Title: Heap pipe vacuum furnace

Abstract: A vacuum furnace heats articles by radiation from a condenser portion of a heat pipe. The heat pipe further includes an adiabatic portion passing through the enclosing wall of the furnace and an evaporator portion outside the enclosure. The evaporator portion is preferably heated by a gas-fired burner which may surround it, and the heat pipe acts as a flux converter accepting heat outside the enclosure and delivering heat inside the enclosure to the articles to be heated. The condenser portion of the heat pipe may be panel-shaped and is disposed adjacent the articles to be heat-treated. In the more elaborate forms of the invention involving condenser panels, the condenser panel, or each condenser panel where several heat pipes are used, is a cylindrical section which partially, or substantially completely, surrounds the articles. The evaporator portion and the condenser portion of the heat pipe are connected by the adiabatic portion which is so arranged that heat loss is minimized at the point where the heat pipe passes through the furnace enclosure.

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Inventors: Lazaridis, Lazaros J. (Lincoln, MA, US)

Application Number: 417653
Filing Date: 1973-11-20
Publication_date: 1976-03-30
Assignee: Thermo Electron Corporation (Waltham, MA)
Primary Class(es): 432/205 165/104.26, 392/394, 432/91
Other Classes:
US Patent Ref:

2237519	Apr, 1941	Bolling	432/91.
2705137	Mar, 1955	Haltmeier	432/205.
3160404	Dec, 1964	Potenzo et al.	13/31.
3209062	Sep, 1965	Scholz	165/105.
3257492	Jun, 1966	Westeren	13/31.
3270250	Aug, 1966	Davis	165/105.
3378449	Apr, 1968	Roberts et al.	165/105.
3613774	Oct, 1971	Blis, Jr.	165/105.
3677329	Jul, 1972	Kirkpatrick	165/105.
3712053	Jan, 1973	Kofink	165/105.

Other Refs:
Primary Examiner: Davis, Jr., Albert W.
Assistant Examiner:
Attorney: Neal; James L.