| 摘要 |
<p>The object of the present invention is a vacuum furnace for thermal treatment, particularly for quenching of metal workpieces made of various grades of steel and alloys. According to the invention the furnace has on the perimeter of the heating chamber flat rectangular elements (1) made of a resistive heating material which secures dimensional and thermal stability. Except for the element situated at the back wall of the furnace, the elements (1) have on their edges a seal (2) of ceramic material, being at the time a current insulator. They are connected by links (4) of a material of good electric conductivity. Each element (1) is divided into segment (1a) of equal size so that a slot (5) is created, insulating each of them electrically. Apertures (6) are made in each segment to allow the flow of gas. The space between the internal wall of the heating chamber and the elements (1) mounted on it is the gas collector (7) from which the cooling gas is forced into the work space of the heating chamber through aperture (6) and slots (5). The furnace is equipped with an element being at the same time a heater and gas collector which makes it possible to increase the work space of the heating chamber without increasing the overall dimensions of the furnace.</p> |
