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Патент USA US3052051

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sePt- 4, 1962
Filed June 11, 1959
4 Sheets-Sheet 1
Sept. 4, 1962
Filed June 11, 1959
4 Sheets-Sheet 2
~43 TERM/g5
Sept. 4, 1962
Filed June 11, 1959
4 Sheets-Sheet 3
Sept. 4, 1962
Filed June 11, 1959
4 Sheets-Sheet 4
Patented Sept. 4, 1962
FIG. 4 is an enlarged fragmentary isometric view of
Bruno J. Falanga, Lawrence, and Grenville B. Gerrish,
M_elrose, Mass; said Falanga assignor to Western Elec
trrc Company, Incorporated, New York, N.Y., a corpo
ration of New York
Filed June 11, 1959, Ser. No. 819,772
2 Claims. (Cl. 34—202)
the oven structure.
The oven includes a base 10 supported on rollers 11.
A main housing 12 mounted on the base ‘10 has a blower
or fan 14 mounted therein. A shaft 15 of the fan '14
is journalled in suitable bearings 16 and has a pulley 17
mounted on its outer end. A motor 18 mounted on the
base 10 has a pulley 19 mounted on its shaft 20 and
connected to the pulley 17 by a belt 21. The circulating
This invention relates to ovens, particularly industrial 10 system, including the fan, has a tubular member 22 ex
tending from an inlet 23 of the fan 14 to a vertical
ovens, for heat treating materials at controlled elevated
hollow portion 24.
A hollow receptacle 26 disposed in registration with an
Various materials to be conditioned for use must be
aperture 27 in the back Wall of the main housing 12,
subjected to controlled elevated temperatures. When such
treatments involve pyrolizing processes, toxic gases may 15 receives suitable ?lters 28. The aperture 27 is a makeup
'be generated presenting the problem of removing the
air inlet for the circulating system, the air passing through
gases from the treating area while maintaining the area
at the desired temperature.
The object of the present invention is an oven which,
the ?lters 28 and through a tubular passageway 29 into
although simple in structure, is highly e?icient in provid
ing a solution to this problem.
In accordance with the object, the invention comprises
an oven having a material treating chamber mounted
the tubular member 22. The circulating system for the
oven also includes a tubular member 31 extending from
the outlet end 32 of the fan upwardly and then hori
zontally at 33 where it connects with a vertical portion 34,
aligned with the portion 24, and with a portion 35. The
portion 35 is separated for a portion of its length from
the portion 33 by a partition 35’, at the right end of which
within a heated air circulating system which transfers heat
through the chamber Wall to the heat treating area with 25 the portion 35 joins the portion 33 and the portion 34.
The right one-third of the portion 33 and its connection
out contaminating the air so that it may be recirculated
with the vertical portion 34 may be de?ned as a by-pass
repeatedly through the heater. A portion of the heated
33' for a reason hereinafter described. A damper 36
circulating air is diverted to and through the chamber to
pivotally supported at 37 is disposed in the horizontal por
an exhaust outlet to supply heat directly to the articles
being treated and to carry away the toxic or other ob 30 tion 33 at the exit end of the by-pass 33'.
The circulating system and substantially all of the
jectionable gases generated in the process.
structure within the main housing 12 is surrounded with a
In one oven, according to the invention, which is par
suitable insulating material 38. For the purpose of illus
ticularly adapted for pyrolizing anodes for tantalum ca
pacitors, the treating chamber is an elongated tubular 35 tration only, FIG. 2 is shown with a portion of this insulat
ing material removed in the area between tubular mem
structure of heat conducting material closed at its ends
ber 31, extending upwardly from the outlet 32 of the fan,
and provided with a longitudinal opening for admitting
and the recirculating portions 24- and 34 to illustrate in
articles to be treated. If desired, a cooling jacket may
FIG. 2 the contours of the portions and a heating cham
surround this opening to protect portions of the article
from the heat of the chamber. A hot air circulating sys 40 ber 39 disposed therebetween.
The heating chamber 39 is widened to provide an in—
tem with rows of inlet and outlet apertures in the treating
chamber, as well as in the intermediate chamber which
terior which, although substantially equal in depth is
larger in cross-sectional area than the cross-sectional area
of the tubular member 31 to allow the air to remain
in the heating chamber a su?icient length of time, or to
45 move therethrough at a greatly reduced rate of speed,
to heat the air to the desired temperature, such as a
Other ducts, connecting the heating chamber with the
maximum temperature of 1,000° F. The heating cham
circulating system and with an exhaust, divert some of
ber 39 may be heated in any suitable manner such as by
the heated air into the chamber where it transfers heat
one or more heating coils 40. Furthermore, the areas or
directly to the articles and produces sui?cient pressure to
substantially surrounds the treating chamber, causes a
continuous flow of hot air around the outside surface of
the treating chamber to maintain it at the desired tem
force out the generated gases. By proper regulation of the
heater and control of the proportion of the air recir
culated, the oven may be operated at high e?iciency by
minimizing the heat lost through the exhaust.
Other objects and advantages will be apparent from the 55
following detailed description when considered in conjunc
tion with the accompanying drawings wherein:
portions 24 and 34 are ?ared outwardly, respectively, to
correspond with the width of the heating chamber 39 to
allow the recirculated air to spread out and ?ll the heat
ing chamber. The portion 24 retards movement of the
large body of air leaving the heating unit and starting its
next circuit.
With reference to FIG. 1, the arrows illustrate the
travel of the heated air upon leaving the fan through a
FIG. 1 is a vertical sectional view of the oven taken
thermal coil 41 into an inlet 42 and out of an outlet 43.
near the back of the oven;
FIG. 2 is a vertical sectional view taken along the line 60 The thermal coil 41 is of a commercially known type con
nected to a variable control unit 44. The inlet ‘42 is con
2—2 of FIG. 1;
nected to the portion 33 in advance of the damper 36
FIG. 3 is an enlarged fragmentary sectional view of
at the ‘by-pass 33' and the outlet 43 is connected to the
the portion of the oven including the treating chamber and
portion 35 as shown in FIGS. '1 and 2. The damper 36
the adjacent structure; and
disposed at the entrance end of the by-pass 33’ controls
the percentage of heated air directed through the inlet 42.
If the damper is open wide or horizontal, almost all the
air will be recirculated through the by-pass 33' with al
most none of the air entering the inlet 42, whereas if the
damper is closed (vertical) all of the air will be caused
to move through the inlet '42.
holder 49 with the supports 48 therein closes the opening
50. The cooling jacket 63 is hollow as at 65 for the cir
culation of coolant such as water through an inlet 66
from a supply, not shown, through the cooling jacket 63
and through an outlet 67 back to the supply.
The unit 44 is also of a
commercially known type and when set, it is adapted
The oven may be readied for operation in advance of
to maintain a predetermined selectively variable tempera
the insertion ‘of the material or articles to be treated by
ture in the heating chamber. The thermal coil 41 aiiected 10 energizing the heating coils 40 to bring the temperature
by the temperature changes in the vertical member 31
in the heating unit 39 to that desired. The unit 44 is set
causes the unit 44 to close one or more circuits through
to maintain the temperature in advance of the treating
the heating coils 40 when the temperature in the system,
chamber 45 at a given level. The motor 18 may be ener
including the heating chamber, drops below a given value
gized and the group of articles 46 in their holder 49 may
and holds the circuits closed until the temperature returns 15 be inserted in the oven to locate the portions to be treated
to the given value. The unit 44 is adjustably set to the
‘in the treating chamber 45.
desired given temperature. The circuits are represented
The articles will remain in the heating chamber a pre
by a cable 68, portions of which are shown in FIGS. 1
determined length of time during which there is a con
and 2.
tinuous recirculation of air at a predetermined elevated
The inlet 42 and the outlet 43 are shown in FIG. 3. 20 temperature through the oven. A predetermined portion
In this ?gure it appears that the inlet 42 and the out
of this circulating air is directed into the treating cham
let 43- are vertically aligned but they are disposed in stag
ber in a path directed away vfrom the articles but caused
gered relation as illustrated in FIG. 1.
to ?ll the treating chamber to cause an internal heating
‘FIGURE 3 illustrates a treating chamber 45 which is
of the chamber through a continuous passing of air
of sufficient length as somewhat illustrated in FIG. 4, to 25 through the chamber.
receive 32 articles 46 disposed upon leads 47 extending
An important purpose of this small percentage of the
outwardly from their mountings 48 which are carried
total air, circulated and recirculated, which in the present
temporarily by a holder 49. The treating chamber 45 is
instance is 30%, is to remove gases resulting from the
formed of heat conducting material, such as stainless steel,
treatment of the materials from the treating chamber.
and is closed at both ends but has a longitudinal open 30 At the same time, the major portion of the heated air is
ing 50 for receiving the row of spaced articles or material
recirculated in such a manner that it is caused to ?ow
46 to be treated. An intermediate or circulating chamber
about the heat conducting material of the treating cham
51 surrounds the major portion of the treating chamber
45 and is disposed in between outer ‘chambers 52 and 53.
ber, applying an external heat to the treating chamber
constantly to retain the predetermined temperature with
Walls 54 of the circulating intermediate ‘chamber, formed 35 in the treating chamber. The recirculated portion, or in
of simiiar heat conductive material, extend the full length
the present instance, the 70% of the heated air is re
of the treating chamber 45 and the outer chambers 52
circulated through the heating unit where it is reheated,
and 53 so as to be closed ‘by the ends which close the
for example, to a temperature in excess of that required
treating chamber 45 and outer chambers 52 and 53.
for the treating chamber, ‘so that the pulling in of an ad
Longitudinal rows of apertures 55 in the bottom wall
ditional 30% of air at room temperature through the
54 of the intermediate chamber 51 serve as inlet ducts
?lters 28 and mixed with the super heated recirculating
for forced air coming into the outer chamber 52 from
air, will result in air ?owing into and around the treating
the inlet ‘42. Other rows of apertures 56 in the upper
chamber at a temperature desired for treating the mate
wall 54 of the intermediate chamber 51 serve as outlet
rial or articles 46.
ducts for the air passing from the circulating intermediate 45
The temperature of the air is controlled through the
chamber through the outer chamber 53 and through the
unit 44 and the percentage of recirculation of the air is
‘outlet ‘43. The inlet ducts 55 and the outlet ducts 56
controlled partially through the sizes of the apertures 59
cause the circulating chamber 51 to be an air passageway
and 61 and also by the damper 36.
which is under the control of the damper 36. The damper
It is to be understood that the above described ar
36 is disposed in the system downstream of the inlet 42
rangements are simply illustrative of the application of
and the inlet ducts 55 adjacent the entrance end of the
the principles of the invention. Numerous other ar
by-pass 33’. Therefore, the angular position of the
rangements may be readily devised by those skilled in the
damper 36 controls the ?ow of heated air through the
art which will embody the principles of the invention and
circulating chamber 51 and about and through the treating
fall within the spirit and scope thereof.
What is claimed is:
chamber 45 via the apertures 55, 57, and 59.
A row of apertures or bypassing ducts 57 allow a per
1. An oven for heat treating a material, carried by a
support Iof a given size which material expels a gas
centage of the heated air to be forced to travel through a
when ‘subjected to a predetermined temperature com
vertical passageway or feeding line 58 and through spaced
prising a treating chamber substantially circular in cross
rows of inlet ducts 59 to enter the treating chamber 45.
The inlet ducts 59 are staggered or disposed in two rows, 60 section and having a material receiving opening adapted
to be closed by the support for the material, the treating
as illustrated in FIG. 4, but both rows are positioned back
chamber being formed of heat conducting material and
of a ba?’ie-plate 60‘ so that all air entering the treating
having an inlet duct adjacent one side of the opening and
chamber will be directed away from the article or mate
an ‘outlet duct 'adjacent the opposing side of the opening,
rial46. Rows of exhaust or outlet ducts 61, which are
larger than the inlet ducts 59, permit air and gases mixed 65 an ‘air circulating system including a circulating chamber
therewith to pass from the treating chamber 45 through
an exhaust line 62. The inlet ducts 59, in the present
instance, are substantially one-half the diameter of the
de?ning an air passage partially surrounding the treating
chamber and having inlet and outlet openings disposed
at opposing sides of the treating chamber so that heated
air passing through the circulating chamber from the
outlet ducts 61.
70 inlet to the outlet openings will have to move about and
A cooling jacket or shield ‘63 has an elongated aper
externally heat the treating chamber, a feeding line
ture 64 therein through which the articles 46 on their
open to ‘the inlet lduot, an exhaust line open from the out
leads 47 and their supports ‘48 may extend, to protect the
let duct to the atmosphere, a by-passing duct connected
supports against the heat of the treating chamber and
to the feeding line to ‘direct 'a given percentage of the
cool the air escaping from the treating chamber. The 75 heated air through the inlet duct into and through the
treating chamber to internally heat the treating cham
ber and cause exhausting yof gases expelled ‘from the mate
rial to pass through the outlet duct and the exhaust line,
an air heating unit ‘in the air circulating system to heat
the air therein to a predetermined elevated temperature,
and means ‘to cause the heated air to ?ow continuously
through the system with :a given percentage of the heated
air to ?ow through the circulating chamber to externally
heat the treating chamber and the remaining percentage
of the heated air to ?ow through the by passing duct.
to circulate through ‘the treating chamber in a path away
from :the material to the outlet duct.
References Cited in the ?le of this patent
Nichols _____________ __ Mar. 21, 1933
Otis _________________ __ Jan. 28, 1936
McBean _____________ __ Dec. 26, 1944
Huggins _____________ __ Feb‘. 10, 1953
Italy ________________ __ Feb. 15, 1951
France ______________ __ Apr. 29, 1954
2. An even according to claim 1 in which a ba?le
is mounted adjacent the opening in the treating chamber
and extends between the inlet ‘duct and the material to
de?ect the heated air away from the material and cause it
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