US1794151A

US1794151A - Heat-treating furnace

Info

Publication number: US1794151A
Application number: US397017A
Authority: US
Inventors: Frank T Cope
Original assignee: Electric Furnace Co
Current assignee: Electric Furnace Co
Priority date: 1929-10-03
Filing date: 1929-10-03
Publication date: 1931-02-24
Anticipated expiration: 1948-02-24

Description

7/ Feb. 24, 1931. F. T. COPE HEAT TREATING FURNACE Filed Oct 3mm Fra m z'a e M M m w Patented Feb. 24, 1931 UNITED STATES PATENIT'QFFICE rm: '1'. corn, or sauna, omo, assrenoa'ro ran ELECTRIC summon comramr,

or sum, one, A coaroaarron or onro HEAT-TREATING FURNACE Application filed October 8, 1829. Serial No. 397,017.

The invention relates to heat treating furnaces of'that type in which the articles to be heated or heat treated are carried in a basket or container through which hot airis continually circulated. a

The object of the improvement is to provide a furnace especially adapted for the heat treatment of small articles which are. placed in the furnace ina container or receptacle sealed at both ends, a baflie wall being located between the heating means and the container, and a perforate pressure chamber beinglocated within the receptacle and rovided with a fan or the like for continually orcing heated airthrou h the container, the air within the furnace cl iamber as it is cooled passing downward past the heating means where it is reheated and again circulated upward through the container.

An embodiment of the invention is illustrated in the accompanying drawing, in which The figure is a vertical sectional view throu h afurnace constructed in accordance witht einvention.

Similar numerals refer to similar parts throughout the drawing. 7 The furnace may be of any usual and well known construction, comprising the side walls 10 and bottom wall 11 formed of suitablerefractory material and enclosed in the metallic shell 12, the entire structure being preferably supported spaced above the fioor 13 as by the channel irons 14.

The furnace is preferably provided with a 85 removable roof or crown 16 of suitable refractory material enclosed in the metal shell or frame 17 and preferably provided with the depending flange 18 for normal entrance into the sand sealing channel 19 carried at the upper open end of the furnace proper.

For the purpose of easily removin and. replacing the roof or crown, a verti'ca post 20 may be supported at one side of the furnace and have mounted thereon the sliding bracket 21 provided with the horizontal arm 22 connected to the central portion of the roof frame or shell.

A weighted lever 23 may be rovided for counterbalancing the weight of t e roof when HElSSllED described. Bafiie walls 25 are located'within the furnace chamber and spaced a slight distance from the. heating elements.

These baflie walls terminate, at their upper ends near the upper end of the furnace chamher, the lower ends thereof being extended toward the center of the furnace as at 26 and terminating in a hollow frustum 27.

A fan 28 is located at the base of the frustum, being mounted on the vertical shaft 29 journaled through a suitable bearing 30, in the bottom wall of the furnace, and driven by any suitable means, such as the motor 31 ivivhich may be located within a pit 32 in the oor.

The container or basket, which receives the articles to be heat treated, is adapted to be placed within the bafie walls 25 and rest upon the horizontal portions 26 thereof and is indicated generally at 33, bein preferablyprovided at its lower end with the depending flanges or fins 34: for contact upon the horizontal walls 26.

This container is preferably provided with the central pressure chamber 35 which may be sli htly coned at its lower end as at 36,

where y the container may be easily centered upon the frustum 27.

Openings 37 are formed in the side walls and pressure chamber of the container, the up r end of the tube being closed as by the wall 38 and a removable cover 39 being provided for closing the body portion of the container.

In operating the furnace, the articles to be heat treated are placed within the container 33 and the roof of the furnace is then raised and moved to oneside, permitting the container to be lowered into place as shown in the drawing. 1

The roof is'then replaced upon thefurnace and the fan 28 operated, circulating the air in the direction of the arrows shown in the drawing, the hot air passing upward through the frustum 27 and into the pressure chamber 35,1passing through the openings therein and t rough the container and then out through the open' I 1 of'the container and upward over the b ii wall 25.

As the air 0001s it descends past the heating elements 24 where it is reheated and again circulated through the pressure chamber and container. It will be seen that this 9 tends tomaintain an even temperature in the articles in all parts of the container, thus' vinig each article substantially the sameeat treatment as all of the other articles in the furnace.

near the top of the chamber, a basket provided with rforated side walls for holding material within the baflie walls, and means for circulating air upward into the basket and out throu h the perforated side walls and downwar between the heating means and bafie walls.

2. A furnace including a chamber, heating means at the sides of the chamber, bafile walls aced from the heating means andfrom the bottom of the chamber, and terminating near the top of the chamber, a basket rovided with perforated side walls for hol in Imaterial within the bafiie walls, anda an in the chamber for circulating air upward into the basket and out throu h the perforated side walls and downward etween the heat ing means and bafie walls.

' 3. A furnace includin a'chamber, heating means at the sides the chamber, baffle walls s aced from the heating means and from the gottom of the chamber, and terminating near the to of the chamber, a basket provi ed with per orated side walls for holdmg materi'al within the bafle .walls, and a fan in the bottom of the chamber for circulating air ..upward into the basket and out througlgtheperforated side walls and downward tween the heating means and bafile walls.

a. A furnace including a chamber, heat- M ing means at the sides of the chamber, baf

. fie walls spaced from the heating means and from the bottom of the chamber and extending inwardl adjacent the bottom of the chamber, an terminating near the top'of the chamb r, a hollow frustum at the inner termifor holding material within the baflie walls, said basket having a central, perforate pressure chamber adapted to register with said basket, and means'for circulating air upward through the hollow frustum and pressure,

from the bottom of the chamber and extend-' ing inwardly adjacent the bottom of the chamber, and terminating near the top of the chamber, a hollow frustumat the inner termination of the bafiie walls, a perforate basket for holdin material within the bafiie .walls, said basket having a central, perforate pressure chamber adapted to register with said hollow frustum, a cover for the top of the basket, and a fan at the bottom of the hollow frustum for circulating air u ward through the hollow frustum and per orate pressure chamber, throu h the basket, and downward between t e heating means and bafile walls.

6. A furnace includin a heatin cham-- ber, baflle walls spaced rom the si e walls of the heating chamber and from the top and bottom of the chamber, a material receptacle having a perforate outer wall spaced from the bafile walls, a 'ressure chamber within the receptacle and avin a perforate wall, the top and bottom of t e receptacle being sealed whereby fluid from the pressure chamber must pass through the material in the receptacle, heating means located in the path of t e fluid, and means for circulating air upward through the pressure chamber.

7. A furnace including a. chamber, heating v means at the sides of the chamber, baflie walls space from the heating means and from the bottom of the chamber and extending inwardly adjacent the bottom of the chamber, said baflle walls terminating near the top of the chamber, an air inlet at the inner termination of the baiiie walls, a basket for holding material within the baflle walls and provided with perforated side walls, said basket having a central, perforate pressure chamber ada ted to register with said air inlet, a cover or the top of the basket, and meansfor circulatin'g air upward through the air inlet, outward through the perforate pressure chamber into and through the basket, outward through the perforated side walls of the basg'ket, and downward between the heating means and bafile walls. I

.In testimony that I claim the above, I have hereunto subscribed m name.

. RANK T. COPE.

' nation of the baffle walls, a perforate basket.

at hollow frustum, a cover for the top of the 1