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Патент USA US2122640

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‘Patented July 5, 1938
2,122,640
[UNITED ‘STATES
("at
I
PATENT OFFICE
' 2,122,640
DRAFT STABILIZER
Edward A. Field and Edward A. Field, Jr.,
'
Chicago, Ill.
, Application July 26, 1935, Serial No. 33,242
5 Claims. , (Cl. 236-—45)
The counterbalance is so arranged in rela
signed by us for embodiment in the draft stabilizer
of Letters Patent No. 1,855,228, issued to us April
tion to the gate that the degree of opening of
the gate varies substantially in accordance with
the variation of draft therefor, thus maintaining
26, 1932, and No. 1,873,567 issued to us August
23, 1932, and we have illustrated them as so em
a substantially constant draft in the ?rebox.
bodied.
The "relation of the counterweight and gate is
substantially that described and claimed in our
Patent No. 1,783,418, issued December 2, 1930.
At the bottom of the outlet opening of the
stabilizer housing, we provide a shelf I6 disposed 10
parallel to the top of the housing and between
this shelf and the top of the housing we dispose
a plurality of louvers ll, these louvers being in
.
The main object of the invention is to provide
a draft stabilizer well adapted for use in large
power plants which is highly effective and not
likely to become clogged or rendered inaccurate
by accumulations of dust or ash on the control
gate or other parts‘.
, .
>
*
A further object is to provide a stabilizer ap
15
paratus having these advantages which is very
simple and economical in its parts.
Objects relating to details and economies of
our invention will appear from the description
to follow. The invention-is de?ned and pointed
out in the claims.
20
'
A structure which is a preferred embodiment
of our invention is illustrated in the accompany
ing drawing, in which:
Fig. 1 is a view of a draft stabilizer embodying
our invention, the stabilizer housing and breech
25 ing with which it is associated being shown in
vertical transverse section.
Fig. 2 is a fragmentary front perspective view
with the gate and its counterbalance omitted.
In the accompanying drawing, I represents the
30
'
Our present improvements are especially de
breeching of a power plant or heating system, the
direction of flow therein being indicated by the
arrow 2. The breeching has an opening 3 in one
side wall thereof.
The stabilizer housing 4 is mounted on the side
of the breeching as by means of the clamps 5, this
35 housing being provided with an inlet opening 6
‘and an outlet opening 1 registering with the
opening 3 in the breeching wall.
The stabilizer gate or damper 8 is provided
with a pivot member 9 rockingly or pivotally sup
40 ported on the ledge-like member H1 at the bottom
of the inlet opening, this being in the structure
illustrated a part of an angle iron frame sur
rounding the opening. The gate is thus support
ed to swing inwardly in opening and its upper end
45 is substantially spaced from the ~ top of the
stabilizer housing.
The gate is provided with a downwardly pro
jecting arm I i on which is mounted a supporting
frame l2 for the adjustable weight indicated at
‘This weight is shifted along the supporting
frame by means of the screw l4 driven from the
motor l5. The automatic control mechanism for
the motor is preferably that shown in our said
1 Patent No. 1,855,228 and is, therefore, not further
55 illustrated and described herein.
50 13.
clined in thedirection of flow of the ?ow within
the breeching. In the embodiment illustrated, 15
there is a space “3 of greater width than the
spaces between the louvers, this space 18 being
at the rear end of the opening relative to the
direction of flow within the breeching. There is
no necessity for louvers at this point because of 20
the fact that there is always an inward ?ow of
air at this location. In a housing unprovided with
louvers, the smoke will eddy into the housing at
the side nearest the boiler or furnace, but as
long as the gate of the control housing is open 25
even a slight amount, the air passing the gate
tends to crowd over to the side of the housing far
thest from the boiler; i. e., it tends to pass through
the space 18; and this ?ow of air will prevent the
entrance of smoke at that point. The louver 30
blades are provided to prevent entrance of smoke
throughout the rest of the area of the opening and
are very effective, especially when the amount of
air entering the housing through the gate is
small.
This particular arrangement of louvers with 35
the wider space described results in a very
efficient operation, the deposit of soot or cin
ders or ash within the housing and on the gate
being very effectively prevented.
40
We have illustrated and described our im
provements in a highly practical embodiment.
We have not attempted to illustrate or describe
other embodiments or adaptations as we believe
this disclosure will enable those skilled in the 45
art to embody or adapt our improvements as
may be desired.
Having thus described our invention, What we
claim as new and desire to secure by Letters
50
Patent, is:
1. In a draft stabilizer, the combination with
a breeching having a side opening therein, of a
stabilizer housing having an inlet opening in its
front wall and an outlet opening in its rear wall
registering with said opening in said breeching, 55
2,122,640
there being a shelf projecting into the housing
at the bottom of the outlet opening, a plurality
of vertically disposed spaced louvers disposed
said outlet opening disposed within the stabilizer
housing, the louvers being inclined in the direc
tion of flow within the breeching, there being
within the stabilizer housing between said shelf
a space at the rear end of the opening relative
'and'the top of the housing, the louvers being
inclined in the direction of ?ow within the
to the flow within the breeching of greater width
breeching, there being a space at the rear end of
the opening relative to the flow within the’
terbalanced gate for said inlet opening pivoted
at its lower end to swing inwardly in opening.
4. In a draft stabilizer, the combination with
breeching of greater width than the spaces be
10 tween the louvers, and a counterbalanced gate for
than the spaces between the louvers, and a coun
a horizontally disposed breeching having a side 10
said inlet opening pivoted at its lower end to
swing inwardly in opening, the upper end of the.
opening therein, of a ‘stabilizer housing having
gate being substantially below the top of the
opening in its rear wall registering with said
opening in said breeching, a plurality of ver
housing and the upper ends of the louvers.
2. In a draft stabilizer, the combination with
a breeching having a side opening therein, of
a stabilizer housing having an inlet opening in
its front wall and an outlet opening in its rear
wall registering with said opening in said breech,
20 ing, there being a shelf projecting into the hous
ing at the bottom of the outlet opening, a plu
15
rality of vertically disposed spaced louvers dis
posed within the stabilizer housing between said
shelf and the top of the housing, the louvers be
25 ing inclined in the direction of flow within the
breeching, and a counterbalanced gate for said
inlet opening pivoted at its lower end to swing
inwardly in opening, the upper end of the gate
being substantially below the top of the housing
30 and the upper ends of the louvers.
3. In a draft stabilizer, the combination with a
' breeching having a side opening therein, of a sta
bilizer housing having an inlet opening in its rear
wall registering with said opening in said breech
35 ing, a plurality of vertically disposed louvers for
an inlet opening in its front wall and an outlet
tically disposed louvers Within said housing with 15
their edges substantially flush with the breech
ing opening, the louvers being inclined toward
the breeching and in the direction of ?ow within
the breeching, and a counterbalanced gate for 20
said inlet opening pivoted at its lower end to
swing inwardly in opening.
7
5. In a draft stabilizer, the combination with
a breeching having a side opening therein, of a
stabilizer housing having an inlet opening in its
front wall provided with a draft responsive in 25
let gate and an outlet opening in its rear wall
registering with said breeching opening, and a
plurality of substantially parallel louvers within
said housing with their rear edges closely adja
cent to the breeching opening, the louvers being 30
inclined toward the breeching and in the direc
tion of ?ow within the breeching.
EDWARD A. FIELD.
EDWARD A. FIELD, JR.
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