DE1060889B - Liftable and lowerable cooling hood for controlled cooling in the hood furnace annealing operation to cover over an inner protective cover to maintain the protective gas atmosphere in the annealed material - Google Patents

Description

GERMAN

kl. 18c 8/90

INTERNAT. KL. C 21 d

PATENT OFFICE

R15779VI / 18C

REGISTRATION DATE: JANUARY 11, 1955

NOTICE
THE REGISTRATION
AND ISSUE OF THE
AÜSLEGE5 CHRIFT:

JULY 9, 1959

The invention relates to a cooling hood used in the bell-type furnace annealing operation, such as those for Shortening of the cooling times, especially in the case of protective gas annealing, to be cooled under a protective hood Annealed stacks are used and placed over the inner protective hood, with cold air now from the room by a fan arranged on the hood, optionally controllable by the The annular space formed between the protective hood and the cooling hood is promoted and the exhaust air heated in this way is preferred can be blown off upwards. The cooling is improved in this way with under protective hoods with protective gas filling ■ still standing by circulating this protective gas through an im The furnace base accelerates the moving impeller, whereby the protective gas stores the heat from the stack of items to be annealed to the protective hood wall cooled from the outside by the cooling hood operation.

The novelty is that the cooling hood is not only suitable for operation with flowing fresh air is instructed, but that return lines for circulation and organs for fresh air supply within an optionally insulated hood jacket or above the hood jacket as well in these controllable heating elements are provided, which not only accelerate or slow down cooling, but also a controlled program cooling, optionally held in temperature levels in Allow connection with known temperature switching and control devices.

When annealing in hood furnaces, as series and round systems with hoods that can be raised and lowered or bases are known, it is easier to use for shortening or influencing the cooling rate Cooling hoods are common, which over the annealing material or over a tightly enclosing the annealing material against the ingress of air inner protective hood can be put on, with facilities for room air supply and hot air discharge, z. B. with arranged in the hood ceiling fan, or devices for sprinkling or spraying with water and similar cooling liquids or those for the nebulization of Cooling liquids and the humidification of the cooling air can be used. Furthermore, proposals are known use a liftable and lowerable cooling hood with a circulator to cool items that are stacked in a ring, which form concentric annular spaces for counter-rotating air movement that carry cooling lines Air duct insert, which has a central tube dipping into the middle of the stack of annealing materials and a cooling air circulation via an open ring stack or via a special protective hood with a central cavity. All of these aforementioned cooling devices are for bell-type furnace operation Cooling hood that can be raised and lowered

for controlled cooling

in bell-type annealing operation

to slip over

via an inner protective hood

to maintain the protective gas atmosphere

in the annealing material

Applicant:

Hans Werner Rohrwasser,
Wuppertal-Barmen, Höhne 19th

Hans Werner Rohrwasser, Wuppertal-Barmen,
has been named as the inventor

however, not set up for any controllable program cooling with specific hold times or Can only be used in conjunction with special hoods. Finally, other suggestions still refer to the immediate cooling of the annealing material in the hood furnace itself during the annealing time of the temperature effect exposed air guide cylinders as well as annealing material cooling by means of re-cooling protective gas ; but these methods have not found widespread use either. The heating and cooling in such systems by protective gas, which is heated or cooled in separate systems, also appears can only be used advantageously for special purposes and at low temperatures.

In contrast to all these cooling methods in a standing room atmosphere, under cooling hoods with fresh air, Spraying or misting operation or in systems with protective gas recooling is the proposal according to the invention to a cooling hood with heatable circulating air and controllable fresh air operation, with the cooling air from bottom to top or from above can flow downwards.

It belongs within the scope of the invention, the circulator inside or outside the hood casing for circulation in one direction or the other and instead of ducts for return air to provide a double jacket as well as the cooling hood expediently as a double jacket Train intermediate insulation.

909 560/283

Claims (1)

In the drawing, the circulating, cooling and holding hood according to the invention is shown in Fig. 1 for rising cooling or circulating air and in, .Fig. 2 for sloping cooling or circulating air, for example. wisely pointed out. The cooling hood formed from a double sheet metal jacket with intermediate insulation is provided on its ceiling with a circulator δ and at its lower end with an annular slot c , which is used for simple cooling air operation and in the circulator installation for rising cooling air according to FIG the hot air through outlet port p on the ceiling to escape, while at the Umwälzereinbau for downward flowing cooling air in FIG. 2 serves for hot air discharge, wherein the cold air is sucked g by arranged at the upper end of the circulating air lines closable openings. Instead of a ring slot can c distributed over the periphery or d arranged openings are used for the same purpose in the lower ends of the circulation pipes. For the use of the circulating air cooling mode, these lower openings c for cold air access and the upper openings p for hot air outlet according to FIG. 1 or these upper openings g for cold air access and the lower openings c for hot air outlet according to FIG. 2 are completely or partially closed and the slide f of the circulating air circuits close, according to FIG. 1 on the pressure side of the circulator and according to FIG. 2 on the suction and pressure side of the circulator, circulating air return lines are wholly or partially opened. For program cooling, the fresh air openings c, g built into these circulating air lines, as shown in Fig. 1 and upper according to Fig. 2, as well as the exhaust air openings p on the cooling hood are regulated by appropriate slides and, if necessary, the heating devices to be installed on the pressure side of the circulating air lines e are operated . It is therefore no problem, the cooling hood according to the invention only with fresh air or At times only with uncooled, cooled by the addition of fresh air or additionally heated by heating to operate, to compensate for undesired heat losses and to operate a controlled cooling program. The annealing material stack i is located under the protective hood h on the base k in a known manner, whereby protective gas can be supplied and removed by the circulator built into the base in an likewise known manner, as well as through connections r. From the inner and outer directions of circulation of circulating air and protective gas, indicated by arrows, which can run in cocurrent according to FIG. 1 or in countercurrent according to FIG Cooling can be driven with temperature levels and temperature holding times. ¹ S claim: Liftable and lowerable cooling hood for controlled cooling in hood-type furnace annealing operation to slip over an inner protective hood to maintain the protective gas atmosphere in the annealing material, the cooling hood being provided with a fan located in the upper ceiling opening for circulation and with means for cooling the cooling air, characterized that for the return of the cooling air to the circulator (b) the lower edge and the upper ceiling connecting air circulation lines (d) are provided, in these air circulation lines designed as channels in the hood jacket or as pipes above the hood jacket manually or automatically adjustable throttle points (/ ), Air heater (e) and fresh air supply (g) and on the lower edge of the cooling hood (a) for hot air discharge or cold air supply lockable ring slots (c) as well as lockable exhaust air sockets on the ceiling (ρ) are arranged. Considered publications:
German Patent Nos. 722 948, 709 607;
Austrian Patent No. 113 665;
Swiss Patent No. 115 755;
U.S. Patent Nos. 2,529,609, 2,479,814, 325,677; German patent application L9126VI / 18c (be made known on June 11th 1952). 1 sheet of drawings © 909 560/283 6. 59