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Патент USA US2106668

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Jan-25, 1938.
P. H. THOMPSON. 2D
2,106,668
THERMOSTATIC FITTING
‘Filed Nov. 21, 1935
i
Patented Jan. 25, 1938
2,106,668?
UNITED STATES PATENT OFFICE
2,106,668
THERMO‘S TATIC FITTING
Parke H. Thompson, II, Maplewood, Mo., as
signor to Alco- Valve Company, Inc., St. Louis,
Mo., a corporation of Missouri
Application November 21, 1935, Serial No. 50,991
'7 Claims.
This invention relates to thermostatic ?ttings
of general applicability, but especially designed
duits, and corresponding to the temperature of
the refrigerant within the conduit.
Prior to the advent of the present invention,
A further object of the invention, in connec
tion with that form in which the bulb follows the
bend of a ?tting, is to position the bulb so that
its surface will be angularly impinged by the ?ow
ing refrigerant, thereby scouring away any sur
face ?lm of inert refrigerant which ordinarily
to be intercalated in refrigerant-carrying con
some manufacturers of mechanical refrigerators
would cling to the bulb.
have been content to merely place the thermostat
in the refrigerated chamber, where it responds to
the temperature of the refrigerated atmosphere.
Others have effected a compromise by clamping
the thermostat against the refrigerant conduit, so
that it responds to the composite temperature of
the refrigerant and the atmosphere of the refrig
erated chamber, but the placing of the thermo
Another object of the invention. is to locate the
bulb in the conduit closer to the bottom wall than
to the other walls, so that it will be bathed in a 10
stratum of the denser gas.
Other objects of the invention will appear as
the following description of a preferred and prac
tical embodiment thereof proceeds.
static element in either of these locations is un
of which the same characters of reference have
satisfactory, for it responds to spurious condi
been employed to designate identical parts:
tions, such as caused by the momentary opening
of the refrigerator door.
It has been proposed to enclose the thermo
static bulb within the refrigerant conduit, but
the means for doing so, up to the present time,
have been difficult or expensive'to construct and
install, or have formed an obstacle to the normal
?ow of the refrigerant.
The general object of the present invention is
to provide a ?tting, either of straight or bent
In the drawing, throughout the several ?gures
Figure 1 is a longitudinal diametrical section
through a straight ?tting embodying the prin
ciples of the present invention;
20
Figure 2 is a cross section taken along the line
2--2 of. Figure 1;
v
Figure 3 is a longitudinal diametrical section
through an elbow-shaped ?tting;
.
Figure 4 is a vertical axial section taken at 25
right angles to the view shown in Figure 3, the '
lower portion being broken away;
form, adapted to be interposed between the ad
Figure 5 is a cross section similar to that of
jacent ends of a refrigerant conduit so as to form
Figure 2, but showing a slightly modi?ed form of
the invention; and
30
30 part of the said conduit, and enclosing as a uni
tary part thereof, a thermostatic bulb spaced from
the walls of said ?tting and having an end con
struction which minimizes its obstruction to the
?ow of refrigerant through‘the conduit.
Another object of the invention is to provide
35
Figure 6 is a cross section taken along the line 6-—6 of Figure l.
>
a ?tting having a thermostatic bulb arranged
Referring now in detail to the several ?gures,
and ?rst adverting to that form of the invention
illustrated in Figures 1 and 2, the ?tting l is con
stituted by standard end connections 2 and 3,.
therein and supported laterally from the walls
which may be similar and, as shown, are threaded
of said ?tting.
and of the solderless type, it being understood
_
A further object of the invention is the provi
sion in a thermostatic ?tting, as described, of lat
eral posts supporting the bulb, the‘posts being
hollow so that one can form a portion of the tube
which places the bulb in communication with the
control element of the thermostat, while the other
45 post may be utilized for ?lling the bulb and its
appurtenant instrumentalities with the volatile
?uid.
Still another object of the invention is to
streamline the ends of the bulb so that the ?ow
50 ing refrigerant does not create eddies'and back
pressure at the forward end of the bulb, and
causing the refrigerant to follow the surface of
the bulb to its rearward end, making the thermo
stat extremely sensitive to the temperature of
55 the ?owing refrigerant.
of course that the construction of the connec
tions as shown is exemplary only and that any 40
other form may be employed without transcend
ing the scope of the invention.
Said connections are provided at either inner
end with annular rabbets 4 and 5, constituting a
seat for the ends of the cylindrical section or
barrel 6, which cylindrical section is preferably
soldered to the end connections as is indicated
at ‘I.
'
The end connections are bored as at 8, so as
to make the ?tting a continuation of the refrig 50
erant or other conduit in ‘which the ?tting is
intercalated. The diameter of they intermediate
section or barrel 6 is larger than the diameter of
the bores 8.
Within the barrel 6 is a thermostatic bulb or‘ 55
2,.
..
capsule 9.
This was inserted into the barrel 6
2,106,668
before the latter was secured to the end connec
tions 2 and 3, and secured in place within said
barrel by means of posts l0 and II, which pass
laterally from the interior of said barrel to the
exterior through apertures I2 and I3 formed in
a wall of the barrel. The posts are suitably se
cured to the wall of the barrel 5 by solder or any
other suitable means. The posts l0 and‘ H are
preferably hollow, and one of the posts, for ex
ample, the post l9, forms a continuation on the
outside of barrel of the tube M which leads to the
coming gas, so that the gas impinges at an angle
upon the surface of said bulb, in the zone indi
cated by the brace l1, scouring this portion of
the bulb I8 thoroughly and removing the inert
gaseous refrigerant which would ordinarily cling
to the bulb l8 through skin ?lm. This makes the
bulb extremely quick in its response to the
changes in temperature in the ?owing refriger
ant.
'
>
It is obvious that in constructing that form of 10
the invention shown in Figure 3, the bulb [8, to—
gether with the posts l0 and II are made suffi
ciently short to pass into the barrel 2|, are in
troduced into said barrel and the posts aligned
with apertures suitably placed in the wall of said 1,5
expansible motor, not shown, actuated by the
thermostatic element.
The thermal insulation of the bulb 9 is assisted
by making the posts of metal of low conductivity . barrel and then pushed slightly so as to extend
and by restricting their cross section to the mini
through to the outside of said barrel where the
mum area so as to reduce the rate of heat ex
. change with the metal of the enveloping conduit
20 to a minimum. Since it may be desirable to pro
vide auxiliary support for posts of such restricted
cross section, ?ller pieces 25, see Figure 1, may be
provided surrounding the posts I0 and II and
against which the tube 9 rests. The ?ller pieces
are preferably of non-conductive material such
as a phenolic condensation product and they may
be streamlined in the direction of ?ow through
the conduit, as indicated at 26 in Figure 6.
The wall of the tube 9 is preferably made as
30 thin as possible so as to obviate any substantial
metallic reservoir of latent heat which would re
tard the response of the thermostat to tempera
ture changes of the fluid within the conduit.
The tube II also may be hollow and serves as
35 a means of ?lling the thermostatic capsule with
volatile ?uid. Upon completion of the ?lling op
eration, the post I I is permanently sealed off.
It will be observed in Figure 1 that the oppo
site ends of the bulb 9 are tapered, coming sub
stantially to a point at IS. The ends of the bulb
may thus be described as streamlined, which
shape operates to cleave the ?owing refrigerant
gas ‘so as to prevent eddies and back pressure
against the anterior end of the bulb 9.
The
45 gas thus cleft flows with substantially undimin
ished Velocity, through the annular space l6, be
tween the bulb 9 and the inner surface of the
barrel 6, and exits from the ?tting by way of
the end connection 3. The posterior end of the
bulb 9 is streamlined so as to direct the flowing
gas down close to the surface of the thermostat
in the rear, thereby making the bulb substantially
one hundred percent efficient in its response to
temperature variations of the refrigerant. .
Figures 3 and 4 show an elbow ?tting adapted
to be interposed between adjacent‘ ends of a re~
frigerant conduit and to form a bend in said
conduit. In this form of the invention, the end
‘conections 2 and 3 are the same as in that form
60 of the invention ?rst described.
The barrel 2|,
as shown, has the form of a long sweeping right
angled curve or elbow. It is soldered to the end
connections in the same manner as ‘in Figure 1,
and the bulb is likewise streamlined at the ends.
The bulb is supported away from the sides of the
barrel 2| by the hollow posts l0 and II which
extend laterally through the side wall of the ?t
ting. The posts lead respectively to the tube I0
which serves the expansible element, not shown,
70 and to a ?lling source, not shown, by means of
which the bulb I8 is charged with volatile ?uid,
after which the tube l l is sealed off. >
The form of the invention illustrated in Figure
3 has the advantage that the surface of the bulb
‘is disposed at an angle to the direction of ‘the in
post I0 is then connected so as to form part
of the tube 24. After the bulb l8 has been ?lled,
the post Il may be sealed off by pinching it to 20
gether or by soldering, or in any other suitable
manner.
Figure 5 shows a slight variant of the inven
tion applicable either to the straight or bent type
?tting, in which the bulb I9 is eccentrically 25
mounted within the barrel 20, so as to lie closer to
the bottom wall of the said barrel than to the
other walls. In this position, it is bathed by the
stratum of the denser gas passing through the
30
conduit.
It is obvious that the ‘above invention realizes
the construction of 'a' thermostatic ?tting which
isisimple and inexpensive to construct, easily in
stalled, and which offers the minimum of resist;
ance to the ?ow of the refrigerant gas through 35
the conduit in which it is interposed. It will be
understood to those skilled in the art that the
spec1?c details of construction and the arrange~
ments of the parts as herein disclosed and de
scribed is merely by way of example and not to 40
be construed as limiting the scope of the inven
tion as claimed.
-
What I claim is:
1. Thermostatic ?tting comprising an open
ended tube, nipples at the ends of said tube and 45
connected thereto, said nipples being threaded for
connection to a conduit, a thermostatic bulb in
said tube, posts extending through a wall of said
tube in longitudinally spaced relation support
ing said bulb adjacent its ends in spaced relation 50
to the wall of said tube, said posts being hollow
and communicating with said bulb, one of said
posts communicating externally of said ?tting
with an expansible actuator operated by said 55
thermostatic bulb and the other being sealed hav
lng served as a means for charging volatile ?uid
into said bulb.
,
'
2. Thermostatic ?tting comprising a conduit, a
thermostatic bulb in said-conduit, a hollow post 60
Supporting said bulb in spaced relation to said
conduit, the material of said post being of mini
mum cross sectional area to throttle the exchange
of heat through its metallic mass, and auxiliary
supporting ‘means comprising spacing pieces of 65
thermally non-conductive material surrounding
said post and engaging said bulb and conduit.
v3. Thermostatic ?tting comprising an open
ended tube, nipples at the ends of said tube and
connected thereto, said nipples being adapted for
connection to a conduit, a thermostatic bulb ex
tending longitudinally in said tube, having
wedge-shaped ends confronting the bores of said
nipples, posts extendingthrough a wall of said
tube in longitudinal spaced-‘relation supporting
2,106,668
3
said bulb adjacent its ends in spaced relation to _ said bulb having wedge-shaped endsv confronting
the wall of said tube, said posts being hollow and
communicating with said bulb, one of said posts
communicating externally of said ?tting with an
expansible actuator operated by said thermostat,
and the other being sealed, having served as a
means for charging volatile ?uid into said bulb.
4. Thermostatic ?tting comprising an open
ended tube, nipples at the ends of said tube and
10 connected thereto, said nipples being adapted for
the bores of said nipples.
6. Thermostatic ?tting comprising a conduit, a
thermostatic bulb in said conduit spaced from the
walls thereof, a tube communicating with said
bulb and adapted to lead ?uid under pressurev
therefrom to a thermostatically controlled device, '
and an element made of thermally non-conductive
material surrounding saidtube and supporting
said bulb in heat insulating relation to the me
10
connection to a conduit, a thermostatic bulb in
tallic mass of said ?tting.
said tube, said tube and bulb being curvilinear
about a common center, posts extending through
7. Thermostatic ?tting comprising an open,
ended tube, a thermostatic bulb in said tube,
posts extending through a wall of said tube in
a wall of said tube in longitudinally spaced rela
15 tion supporting said bulb adjacent its ends in
spaced relation to the wall of said tube, said
posts being hollow and communicating with said
bulb, one of said posts communicating exter
20 nally of said ?tting with an expansible actuator
operated by said thermostat, and the other being
sealed, having served as a means for charging
volatile ?uid into said bulb.
5. Thermostatic ?tting as claimed in claim 4,
'
'
longitudinally spaced relation supporting said 15'
bulb adjacent its ends in spaced relation to the
wall of said tube, said posts being hollow and
communicating with said bulb, one of said posts
communicating externally of said ?tting with an
expansible actuator operated by said thermo 20
static bulb and the other being sealed, having
served as a means for charging volatile ?uid into
said bulb.
_
PARKE H. THOMPSON, II.
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