Patent ID: 9733020
Date: 2017-08-15
CPC Classifications: B22F,B30B,F27D

Claim:
1. A pressing arrangement for hot pressing, comprising: a pressure vessel including a furnace chamber adapted to hold articles, which furnace chamber is provided inside the pressure vessel; a heat insulated casing arranged to surround said furnace chamber; a bottom insulating portion arranged beneath said furnace chamber; a fan having an adjustable number of revolutions, said fan being arranged to provide a flow of pressure medium into said furnace chamber and a circulation of said pressure medium within the furnace chamber when operated; and at least one valveless feeding passage having an outlet located at a radial and vertical distance relative said fan, said at least one valveless feeding passage being arranged to provide a connection during at least a steady state and a cooling state between a region, inside said pressure vessel and beneath said bottom insulating portion, and an inlet of said fan so as to enable, by increasing the number of revolutions of said fan to generate a sufficient pressure difference between said region and a passage above said bottom insulating portion and below said furnace chamber, a flow of pressure medium from said region to said inlet for mixing said flow from said region with a flow of pressure medium in said passage, wherein said flow can be controlled by adjusting said number of revolutions of said fan, wherein said at least one valveless feeding passage is at least one conduit arranged in said bottom insulating portion at a radial distance from a central axis of said fan and wherein a respective outlet of said conduit is located in connection to a passage above said bottom insulating portion.