SU1306972A1 - Bell-type furnace bench - Google Patents

Abstract

The invention relates to the design of bell-type furnaces for annealing rolled material collected in the feet in a protective gas environment, in particular to the stands of furnaces with forced circulation of heat-transfer agent. The purpose of the invention is to increase the productivity of the stand due to the intensification of the cooling of the foot rolls and the reduction of the specific consumption of protective gas. The stand of the bell-type furnace contains a lined base, a guide apparatus with an annular cavity to form a closed circulation circuit during the heating of the coils. New is the implementation of an additional volute-shaped cavity in the lined base, in which axial movement of the fan is possible with the formation of a closed circulation loop during the cooling period. In addition, the stand has seals and oil gates. 4 il. (L

Description

The invention relates to the design of bell-type furnaces for the annealing of rolled material collected in the foot in a protective gas environment, in particular to the stands of furnaces with forced circulation of coolant.

The purpose of the invention is to increase the productivity of the stand due to the intensification of the cooling of the foot of the coils and the reduction of the specific flow rate of welded gas.

FIG. 1 shows the stand when operating in heating mode; in fig. 2 - the same in cooling mode; FIG. 3 is a section A-A in FIG. 2; 4 shows the node I in FIG. one,

The stand of the bell-type furnace contains a furious base 1, a guide device 2, a centrifugal fan 3 with an impeller 4 rigidly connected to a heat insulating plug 5 with guide rods 6. A cavity 7 of the coiled form is located below the guide device 2. The cavity 7 is connected to the underframe m. space by means of a hole in the bottom of the guide unit 2, which allows vertical movement of the fan 3c by stopper 5. On the lid 8 of the heat insulating stopper 5 there are seals 9 and 10 made of heat resistant material. The cavity 7 is connected through the channel 11 to the heat exchanger 12, which is connected to the annular collector 13, and through the pipes 14 to the muffled space. The rods 6 are made with the possibility of vertical movement in the guide sub-holders 15 mounted on a stationary cylindrical box 16 fixed on the base 1 of the casing. A cylindrical knife 17, permanently located in a sealing fluid located in a cylindrical duct 16, is attached to the stopper 5. A channel 11, an annular manifold 13 and pipes 14 form a closed circulation loop during the cooling period, an oil-cooled Water duct 16 and form an oil shutter.

The stand works as follows.

When the rolls of the foot heat up, the fan 3 is in the upper position, and the guide apparatus with an annular cavity forms a closed circuit for the circulation of protective gas. The impeller 4 of the fan 3 is located

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in the guide device 2. The plane of the cover 8 of the heat insulating plug 5 with the seal 9 of heat-resistant material is also in the upper position and ensures the sealing of the bottom of the guide apparatus. The cylindrical knife of the water-cooled oil seal is in the sealing fluid at any position of the plug.

When switching to the cooling mode, the fan is moved to the down position. Its impeller is located in the cavity under the guide vane. This ensures the direction of the total flow in the channel 1 1 and further through the heat exchanger 12 to the annular manifold 13, and then through the pipes 14 into the buried space. The bottom cavity of the cork lid and the seal ensures the tightness of the bottom of the cavity. After the cooling process, the charge is removed and the cycle is repeated.

Such a solution allows to intensify the heat exchange process in the cooling process, reduce local resistances, which contributes to an increase in performance of the stand and a reduction in the consumption of protective gas.

Claims (2)

1. A stand of a bell-type furnace for annealing a roll foot, a sheet material containing a lined base, a guide apparatus with an annular cavity forming a closed a circulation circuit during heating, a fan with a heat insulating stopper, protective gas supply means and a heat exchanger located in the circulation circuit, characterized in that, in order to increase bench performance due to the intensification of the coil foot cooling and to reduce the specific protective gas consumption, the lined base has an additional volute-shaped cavity, the fan is rigidly connected to the heat insulating plug and has the ability to move into the additional cavity to form a closed circulation circuit during the cooling period, and annular seals are placed on the upper and lower surfaces of the fan casing. 313069724 2. The stand according to claim 1, of which is a water-cooled oil, which is supplied with a thief. 1 1. / 1 I (If I I  I j j j 72 Tszig.1 P fig.Z srigL