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Патент USA US3091033

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May 28, 1963
w L. CARLSON, JR
3,091,023
METHOD OF Ml-IKING A CAPILLARY TUBE FLUID
FILLED TRANSMISSION SYSTEM
Filed Sept. 19, 1960
SYSTEM FILLED WITH FLUID
I"
I3
les
FiJ
7
CA PI LLARY TUBE
ROLLED
IO
5
EXCESS FLUID AS
VOLUME OF CAPILLARY
DECREASES
ll
l0
* IG/V
'3
SYSTEM SEALED
CAPILLARY TUBE
NOT
FILLED
.
FLUID
OLLED
RW|TH
FILLED
FLU|D
INVENTOR.
WILLIAM L. CARLSON, JR.
By/ézwww
A TTOR/VE)’
atent
l
(ice
3,091,923
Patented May 28, 1963
‘2
tion wherein the capillary’ tube is rolled to decrease the
3 0§1,023
.
METHOD OF MAKING: A CAPTLLARY TUBE FLUll)
FILLED TRANSMISSION §YSTEM
William L. Carlson, JL, Bloomington, Minn, assignor t0
Minneapolis-Honeywell Regulator Company, Minne
apolis, Minn, a corporation of Delaware
Filed Sept. 19, 1960, Ser. No. 57,006
6 Claims. (Cl. 29-400)
The present invention is concerned with a novel method
cross-sectional area of the internal bore.
FIGURE 3 is a View of the system which has been
sealed after the cross-sectional area of the capillary tube is
reduced and the excessive ?uid in the system has been
removed.
FIGURE 4 is a cross-sectional showing of the capillary
tube which is not ?lled with?uid.
FIGURE 5 is a cross-sectional view of the capillary
tube with the ?uid ?ll.
FIGURE 6 is a cross-sectional view of the capillary
of making a capillary tube ?uid transmission system; in
particular, the method involves the ?lling of the transmis
tube ‘after the rolling operation with the cross-sectional
sion system with ?uid, and after the capillary tube is ?lled,
area of the bore reduced.
H
H
the tube is rolled to decrease the'bore volume.
Referring to FIGURE 1, a capillary ?uid ?lled trans
Heretofore, when capillary ?uid transmissions were 15 mission system is shown. A capillary tube 10 which
made, a capillary tube was attached at one end to a sens
ing bulb and at the other end to an actuator. After the
might be of any length and have a cross-sectional area as
shown in FIGURE 4 is connected at one end to a bulb or
housing of the ?uid was completely assembled, the non
temperature responsive element 11, and at the other end
compressible ?uid was placed into the housing to ?ll the
to an actuator 12. The temperature responsive bulb is
sensing bulb, the capillary tube, and the actuator. Obvi 20 hollow; so that, when the bulb is ?lled with a medium 17
ously, care must be taken to insure that no compressible
?uid or air remains in the system.
such as a vapor or a noncompressible liquid which changes
in volume upon a change in temperature, a response in
dicative of temperature is obtained. The actuator is of
In such a capillary ?uid transmission system, the output
of the actuator depends upon the increase in volume of
a conventional type which hasa means responsive or dia
the'?uid in the bulb or sensing element. When the volume 25 phragm 19' to a'change in volume of the ?uid ‘therein.
of the ?uid in the capillary tube is substantially large as
One particular type of actuator has a ?exible diaphragm
compared to the volume of the ?uid in the bulb, the
across one side so a change in volume of the ?uid therein
effect of temperature on the capillary tube is quite ‘great.
produces a mechanical movement of the diaphragm and
Often the change in temperature of the capillary tube
thus an associated apparatus. With the housing of the
introduces an error in the system which cannot be 30 system connected as shown, the bulb, the capillary tube,
tolerated.
and the actuator are ?lled with the ?ll medium 17 through
Several schemes have been proposed for compensating
a tube 13 attached to the bulb.
for the effect of the temperature change of the capillary
Since the cross-sectional area of the internal bore 18
tube; however, these schemes are often quite complicated
of the capillary tube is quite large little di?iculty is ex~
35
and tend to increase the cost of the manufacture of such
a system. If the volume of the capillary tube is small in
proportion to the volume of the temperature bulb or sens
ing unit, the error introduced into the system by a change
perienced in completely ?lling the system with a noncom
pressible ?uid. Obviously, when a liquid is used, if an air
bubble or any other compressible ?uid is left in the hous
ing or introduced during the ?lling operation, a change in
in the temperature of the capillary tube is small and can
volume of the ?uid in bulb 11 will not have the correct
be tolerated. The dimension of the internal bore of the 40 effect upon the output of actuator 12. As long as the
capillary tube can be reduced; however, the smaller the
cross-sectional area of the capillary tube is substantially
bore of the capillary tube, the more di?icult the normal
as shown in FIGURE 4 or has a relatively large cross
?lling of the system with ?uid becomes without the intro
sectional, area dimension, the ?lling operation without the
duction of a compressible ?uid such as air.
introduction of any air is relatively simple.
The present invention provides for a ?uid ?lled system"
After the system is completely ?lled with ?uid, the
which has a capillary tube with a very small internal bore
capillary tube is rolled as shown in FIG. 2. The schematic
dimension; and yet, the possibility of introducing a com
showing of the rolling operation involves a ?xed roller 14
pressible ?uid into the system when the system is ?lled
and a movable roller 15 which is spring biased toward
with noncompressible ?uid is lessened. The housing for 50 roller 14 by a compression spring 20. The type of load
the system is connected in a normal manner with a sens
ing on roller 15 can vary with the particular type of capil
ing unit, a capillary tube, and an actuator; however, the
lary tube; however, a constant downward force on roller
internal bore of the capillary tube is quite large. The sys
15 has been found to maintain the internal bore dimen
tem is then ?lled with noncompressible ?uid, and the capil
sion of the capillary tube relatively constant. While the
lary tube is rolled to decrease the cross-sectional area of 55 rolling operation in FIGURE 2 is shown schematically,
the internal bore. As the capillary tube is rolled, the ex
the rolling operation may involve a number of passes hack
cess noncompressi-ble ?uid is bled off of the system.
and forth over the complete length of the capillary tube
When the capillary tube has reached a desired dimension,
until the dimension or internal bore 18 of the capillary
the system is sealed.
tube is substantially as shown in FIGURE 6. During the
Therefore, an object of the present invention is to pro 60 rolling operation, the volume of ?uid in the capillary tube
vide an improved method of making a capillary, ?uid ?lled
is decreased, and the excess ?uid of this system is removed
transmission system.
through the tube 13.
Another object of the present invention is to provide an
After the capillary tube has reached a desired internal
improved method of making a capillary ?uid transmission
bore dimension as shown in FIGURE 6, the system is
system with a minimum volume of ?uid in the capillary 65 sealed at tube 13 in an appropriate manner. The sealed
tube.
?uid transmission system is shown in FIGURE 3 with the
These and other objects will become apparent ‘upon the
reduced cross-sectional area capillary tube.
study of the speci?cation and drawings in which:
The method has been described as applied to a capillary
FIGURE 1 is a view of the ?uid ?lled system having a
liquid transmission system; however, the invention is ap
70
bulb, a capillary tube, and an actuator.
plicable to other ?uid ?lled capillary tube systems whether
FIGURE 2 is a schematic showing of the rolling opera
vapor or liquid is used ‘as the ?ll, and the intention is to
3,091,023
limit the invention by the scope‘of the appended claims in
which I claim:
1. The method of making a thermostat element having
a remote bulb connected by a ?uid ?lled system to an
‘actuator, which consists of attaching a bulb and an actua
tor to opposite ends of a length of tube, ?lling the bulb,
tube and actuator with relatively noncompressible ?uid,
4
manner to insure that there is no compressible ?uid there
in, ?lling the tube with noncompressible ?uid, rolling the
tube with a constant pressure" to reduce the cross-section
area of the bore of the capillary tube, and sealing the tube
to prevent the noncompressible ?uid vfrom escaping when
the volume of the ?uid is increased.
5. The method of making a thermostat element having
rolling the tube to reduce the cross-sectional area of the
a remote bulb connected by a medium ?lled system to an
?uid in a sensing unit is re?ected to a pressure operated
cross-sectional area ‘of the tube bore and, the volume of
actuator which consists of attaching a bulb and an actuator
tube bore, and sealing the system to prevent ?uid loss
10 to opposite ends of a length of tube comprising the steps
when the ?uid in said bulb increases in volume.
of, ?lling the bulb, tube and actuator with a ?u-id medium,
2. In a method of making a noncompressible ?uid ?lled
rolling the tube with a constant pressure to reduce the
control apparatus in which the increase in volume of the
?uid medium therein, and sealing the system to prevent
control device by a capillary tube connection, attaching a
sensing unit and a pressure operated control device to the 15 loss of medium when the medium in said bulb increases
in volume.
opposite ends of a length of tube, ?lling the sensing unit,
6. The method of making a ?uid ?lled capillary tube
the tubing, and the control device with a noncompressible
having a bore size ‘which is difficult to insure that all of
?uid with a free opening to allow ?uid to escape, rolling
the undesired ?uid is removed, ?lling the tube with the ,
the tubing to decrease the size of the opening throughout
desired ?uid, rolling the tube to reduce the cross-sectional
the tubing, and sealing the free opening.
area of the bore and the volume of ?uid contained therein,
3. The method of making a noncompressible ?uid ?lled
and sealing the tube.
'
capillary tube having a bore size which is di?icult to in
sure that all the compressible ?uid is removed, ?lling the
References Cited in the ?le of this patent
tube with noncompressible ?uid, rolling the tube to re
UNITED STATES PATENTS
25
duce the bore cross sectional area, and'sealing the tube.
1,827,766
Rosenburgh __________ __ Oct. 20, 1931
4. The method of making a noncompressible ?uid ?lled
2,047,296
Squires _______________ __ July 14, 1936
capillary tube having a bore size which is so small that
2,366,141
Alder-fer _____________ .__. Dec. 26, 1944
dit?culty is experienced in ?lling the‘capillary in a normal
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