Retort furnace for heat treating metal workpieces
A furnace ( 1 ), which, for the heat treatment of metal workpieces, has a tubular metal retort ( 3 ) and a furnace housing ( 2 ) enclosing the retort ( 3 ), the retort ( 3 ) comprising a gastight closable treatment or batch space ( 10 ), which receives the protective and reactive gases, for the heat treatment of the workpieces and a receptacle framework ( 8 ) as a batch receptacle for the positioning thereof, the weight of the batch and the receptacle framework ( 8 ) is decoupled from the retort ( 3 ), the receptacle framework ( 8 ) is connected to means ( 5 ) for support on the furnace housing ( 2 ), and the means ( 5 ) are guided gastight in passages ( 6 ) of a wall ( 2.1 ) of the furnace housing ( 2 ) and a wall ( 3.1 ) of the retort ( 3 ).
1. A retort furnace ( 1 ) for heat treating metal workpieces, having a furnace housing ( 2 ) enclosing a metal retort ( 3 ), the retort ( 3 ) comprising a gastight closable treatment or batch space ( 10 ) for the heat treatment of a batch of the metal workpieces and a receptacle framework ( 8 ) as a batch receptacle for positioning thereof, wherein
a) the weight of the batch of metal workpieces and the receptacle framework ( 8 ) is decoupled from the retort ( 3 ),
b) the receptacle framework ( 8 ) is connected to means ( 5 ) for support on the furnace housing ( 2 ),
c) the support means ( 5 ) are guided in gastight passages ( 6 ) through a wall ( 2 . 1 ) of the furnace housing ( 2 ) and a wall ( 3 . 1 ) of the retort ( 3 ),
d) the gastight passages ( 6 ) comprising pipes ( 6 . 1 ) that extend through the walls ( 2 . 1 , 3 . 1 ), and length-compensating compensators ( 7 ) operably connected to said pipes ( 6 . 10 ).
2. The retort furnace according to claim 1 , wherein the receptacle framework ( 8 ) is connected by a suspension to the support means ( 5 ) for support on the furnace housing ( 2 ).
3. The retort furnace according to claim 1 or 2 , wherein the support means ( 5 ) are supported via crossbeams ( 9 ) on the furnace housing ( 2 ).
4. The retort furnace according to claim 1 wherein the support means ( 5 ) supporting the receptacle framework ( 8 ) and are also connected to the crossbeams ( 9 ) by connecting joints ( 4 ) on the furnace housing ( 2 ).
5. The retort furnace according to claim 1 comprising at least one cooling bag ( 7 . 2 ) that surrounds each of the pipes ( 6 . 1 ).
6. The retort furnace according to claim 1 wherein the pipes ( 6 . 1 ) comprise insulators ( 7 . 3 ).
7. The retort furnace according to claim 1 wherein the pipes ( 6 . 1 ) are each partitioned outside the furnace housing ( 2 ) using removable flange connections ( 6 . 1 . 3 ) into a first or bottom part ( 6 . 1 . 1 ) and a second or top part ( 6 . 1 . 2 ), the first or bottom part ( 6 . 1 . 1 ) extending through at least one of the walls ( 2 . 1 , 3 . 1 ) and the second or top part ( 6 . 1 . 2 ) being connected to the crossbeams ( 9 ).
8. The retort furnace according to claim 7 , wherein the second or top part ( 6 . 1 . 2 ) comprises a folded bellows sleeve ( 7 . 1 ), which performs the function of the compensator ( 7 ).
9. The retort furnace according to claim 8 , wherein the cooling bag ( 7 . 2 ) surrounds the first or bottom part ( 6 . 1 . 1 ).
10. The retort furnace according to claim 9 , wherein each of the pipes ( 6 . 1 ) and each of the associated compensators ( 7 ) is assembled so as to be replaceable.
11. The retort furnace according to claim 1 wherein the retort ( 3 ) having the support means ( 5 ) can be taken out of the furnace housing ( 2 ) without dissembling the furnace housing, the wall ( 2 . 1 ) of the furnace housing ( 2 ) having a removable segment that encompasses at least an area of the passages ( 6 ) for this purpose.