close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2122931

код для вставки
July 5, 1938.
J; E_ DUBE
2,122,931
EXPANSION VALVE WITH AUTOMATIC TEMPERATURE COMPENSATION
Filed July 9, 1934
5 Sheets-Sheet l
5
3mm
WAQAOM
:57
W
WW5
July" 5, 1938.
I J_ E, DUBE
2,122,931
EXPANSION VALVE WITH AUTOMATIC TEMPERATURE COMPENSATION
Filed July 9, 1934
3 Sheets-Sheet 2
p
,2.
61
3mm
W63 M
July 5, v1938.
‘
J. E. DUBE
2,122,931
EXPANSION VALVE WITH AUTOMATIC TEMPERATURE COMPENSATION
Filed July 9, 1954
J06
102 K.
I03
5 Sheets-Sheet 3
[Ml--11 if?
Patented July 5, 1938
2,122,931
UNITED STATES
PATENT OFFICE
2,122,931
EXPANSION VALVE WITH AUTOMATIC TEM
.
PERATURE COMPENSATION
John E. Dube, Knoxville, Tenn, assignor to The
Fulton Sylphon Company, Knoxville, Tenn., a
corporation of Delaware
Application July 9, 1934, Serial No. 734,342
14 Claims.
This invention relates to temperature ‘compen- ,
sating means for automatic pressure-controlling
valves in refrigerating systems, and more par
ticularly to means whereby the absolute pressure
in the evaporator of a refrigerating machine may
be automatically decreased and increased upon
increase and decrease, respectively, of outside
atmospheric temperature.
It has heretofore been proposed to provide the
conduit of a refrigerating machine through
which the liquid refrigerant flows to the evapo
(Cl. 62-3)
2, an inlet pipe 3 for the liquid refrigerant, said
pipe communicating with a recess 4 in which is
disposed a strainer 5. From the recess 4 a pas
sage 6 leads to a chamber ‘I in which the valve
mechanism to be described is located. Suitably 5
formed in a wall of said chamber 1 is a valve
port and valve seat, here shown as provided
by a thimble 8 threaded into an aperture in the
wall of casing I. Valve port 9 communicates
with a chamber II) from which leads a passage 10
II that communicates with any suitable conduit
for conveying the refrigerant to the evaporator.
Chamber It), as here shown, is formed by an
external generally cup-shaped rigid wall i 2
which is suitably attached, as by soldering or 15
brazing, to a rib l3 on the valve casing I. With
rator with a valve which is controlled by a pres
sure responsive device to predetermine automati
cally thepressure in said'evaporator. But it is
‘sometimes desirable to vary the pressure in the
evaporator as the temperature of the atmosphere
outside of the space cooled by the evaporator in » in said wall I! is a‘ pressure responsive member,
creases and decreases, reducing the absolute here shown as a deeply corrugated, expansibie
pressure in the evaporator with increase of said and collapsible, tubular metal wall or bellows I 4
atmospheric temperature and vice versa.
having one end suitably sealed in an aperture of
The present invention has for its object'to pro
the wall I! and its opposite end suitably con
vide automatic means for varying the pressure in , nected to or formed integrally with a relatively
the evaporator upon changes of atmospheric tem , rigid end wall I 5, here shown as provided with
perature. '
‘
a centrally depressed portion l6. Thus the end
Another object of this invention is to provide wall I5 is subjected to the pressure in the cham
a device of the type characterized which is sim
ber l0, which in turn is substantially the pressure
ple in construction, ei?cient in operation, inex
in the evaporator, and owing to the ?exibility
pensive to manufacture, easy to adjust, and sen
sitive and accurate in determining the change in
evaporator pressure that shall accompany
of the tubular wall l4 said end wall l5 may move
in response to changes of pressure in the evap-,
changes of atmospheric temperature.
Pressure responsive wall I5 is loaded by a coil
spring I‘! which reacts between said movable end
wall l5 and an abutment l8, preferably made ad
_
Other objects will appear as __the description
of theinvention proceeds.
The invention is capable of receiving a variety
\ of mechanical expressions, two of which are
shown on the accompanying drawings, but it is
to be expressly understood that the drawings are
for purposes of illustration only, and are not to
orator.
~
justable so as to predetermine the pressure ex
erted on said end wall l5. As here shown said 35
coil spring I1 is centered by the depressed por
tion It of the wall l5 and by a projection l9 on
said abutment l8. Abutment I8 is illustrated
be construed as a definition of the limits of the
as in the form of a screw having a suitable keri'
invention, reference being had to the appended
in its end whereby it may be engaged by a screw
driver or other suitable tool for threading the
same into or out of an aperture 2| formed in
a housing 22 which surrounds the pressure re
sponsive device heretofore described and which
is shown as attached to the valve casing I, by a 45
claims for that purpose.
'
In said drawings, Figs. 1 and 2 illustrate sche
matically two embodiments ofthe present inven
tion, said ?gures showing the relationship and
form of the parts of structures which will au
tomatically vary the pressure in the evaporator
of a refrigerating machine upon changes in at
mospheric temperature, but without attempting
'to show the parts in their proportions as to di
men-sions, volumes, sizes, etc.; and
'
Fig. 3 is a schematic view of a refrigerating
machine equipped with the present invention.‘
In the form shown in Fig. 1, a valve casing I
of any suitable size, construction and material
has suitably attached thereto, as by the coupling
threaded connection 23.
‘
Cooperating with the valve seat 8 is a valve
member 24, here shown in the form of a cone,
and projecting therefrom through the valve port
9 is a stem 25 which engages in the depression 50
IS in the end wall l5. Valve member 24 has
formed thereon or‘suitably attached thereto a
?ange 26 and a rearwardly extending spindle. 21
which is guided in the recess 28 of a ?anged
sleeve 29. Interposed between the ?ange 30 of
2
2,122,931
said sleeve 23 and the ?ange 26 of said valve.
member 24 is a second coil spring 3| which acts
in opposition to the coil spring I1 and tends to
move the valve member 24' toward its seat.
Cooperating with the outer end of said sleeve
29, which constitutes a movable abutment for the
spring 3 I, is the end wall 32 of a motor element of
a thermostatic device, ‘said end wall being shown
as recessed to receive the end of said‘ sleeve 429.
Said motor element as here shown is formed by a
deeply corrugated, expansible and collapsible,
tubular metal wall or bellows 33 suitably attached
to said recessed ‘end wall 32, as by soldering or
brazing, and having its opposite end suitably'at
15 tached, as by soldering or brazing, to a ledge or
rib 34 formed on a threaded plug 35 which closes
the end of the chamber 1.’ Plug 35 has a passage
36 extending therethrough, and suitably attached
in or to said plug, and communicating with said
motor element 33, is a capillary tube ,31 which
leads to and communicates with a bulb 38, of any
suitable size, construction and character, which
is designed to be suitably mounted where it is
subjected to the temperature‘of the atmosphere.
Bulb 38, capillary tube 31 and the motor element
33 are completely ?lled with an expansible liquid,
and in order to minimize error in the response of
the thermostatic ‘device to the temperature of the
atmosphere the volume of the motor element 33
30 and the capillary tube 31 should vbe kept at a
minimum.
'
_
Fig. 3 illustrates diagrammatically an embodi
ment of the present invention applied to the regu
lation of the evaporator pressure in a conventional.
35 refrigerating system wherein the space or box Hill
of a refrigerating machine is shown as containing
an evaporator IDI in communication with the cas
ing I02 of a temperature compensated pressure
controlling valve of the present invention, the
40 same having a bulb I03, comparable to bulb 38 of
Fig. 1, subjected to the temperature of the atmos
phere outside of said space I00. The system as
illustrated also includes the usual or any suitable
compressor I04, driven by motor I05 under the‘
45 control of a thermostatic switch I 06, receiver I01
to change the difference in pressure exerted by
the springs I1 and 3|, and inasmuch as it is de
sired that the pressure p be lowered with an in
crease in atmospheric temperature, the pressure
exerted by the spring 3| should be increased with 5
increases in atmospheric temperature to decrease
the difference in the pressures exertediby said
springs. This is effected by the mechanism'of the
present invention, because under increase. in at
mospheric temperature the liquid in the bulb 33 ll
expands, and as said bulb, the capillary tube 31
and the motor element 33 are completely ?lled
with said liquid, said expansion produces an ex
pansion of the motor element‘ 33, moving the
?anged sleeve element 29 and increasing the ten- 1.
sion of the spring 3|.
This increase in the tension of the spring 3| is
thus equivalent to a decrease in the tension of the
spring I1 which is to balance the pressure p on- the
end wall I5. Hence a new condition of balance 2
is set up whereby the valve member 24 is moved
to open and close the port in seat 8 to maintain
a new pressure p which is lower ‘than that formerly
existing. As the lower pressure is accompanied by
a lower temperature the differential in tempera- 2
ture or heat gradient between the evaporator and
the chamber being cooled thereby is increased,
and greater in?ow of heat into said chamber due
to the increased atmospheric temperature is thus
_ compensated for.
~
3
Conversely, a decrease in atmospheric tempera
ture causes a contraction in volume of the liquid
in said thermostatic device and a consequent de
crease in the tension of said spring 3 I. Hence the .
pressure 12 that is maintained in the chamber III 3
is automatically decreased and increased with in-»
crease and decrease of the atmospheric tempera
ture, respectively, because the di?erence in pres- ,
sure exerted by the springs I1 and 3| is automati- I)
cally decreased and increased respectively with 4
said changes in temperature. In discussing the
balance of pressures no reference has been made
to atmospheric pressure as this may be regarded
as a relatively constant value to be added to the
tension of the spring I1 for any given condition 4
and condenser I08 communicating with evapora _ of equilibrium.
tor IUI through suitable piping I09.
Whereas in the embodiment of Fig. 1 the ?uid
In operation, the pressure responsive device is pressure maintained by the pressure responsive
subjected to the pressure in the chamber I0, here ‘ device is determined by the di?erential pressure
designated 12, and as before noted this is substan
existing between the oppositely acting resilient
50
tially the pressure in the ‘evaporator. In addition means, and the temperature compensating device
to the pressure p, wall I5 is subjected to the pres
varies said differential, the‘ ?uid pressure main
sure or the coil. spring I1 and, through valve mem
tained by the pressure responsive device may be
ber 24' and spindle 25, to the pressure of the coil determined by'the tension of a- single resilient
spring 3|. Therefore, the pressure p, when the means, and the temperature compensation may be
55
pressures are balanced, is equal to the di?erence effected entirely independently of the pressure re
between the pressures exerted by the coil springs sponsive device, by varying the distance between
I1 and 3I,- and the desired pressure to be main
the relatively movable valve member and its valve
tained in the chamber I 0 can be determined by seat so as to vary theextent to which the resilient
means must be ?exed in order to bring about a
60 rotating the threaded abutment I8 so as to adjust
the tension of the spring I1 until the desired differ
predetermined change of pressure. An embodi
ence in pressure exists between the springs I1 and ment of» the invention, operating in the manner
3|. Ii'thereafter the pressure in the chamber III
last'referred to is shown in Fig. 2.
»
@
|
(
g
In this embodiment a valve casing 40 of any
tends to increase the end wall I5 is moved against
suitable size, construction and material has a
-65 the tension of the spring I1 by the combined ac
tion of-Isaid» pressure and the pressure of spring suitable inlet connection for the liquid refrig
3|, spring 3| moving the valve member 24 toward ' erant, shown' at 4|, leading to a valve port 42
its seat 8 until a new balance is established. If formed in a valve seat [43 integrally formed in
the pressure in the chamber l0 decreases end wall or suitably mounted on the valve casing 43.
70 I5 is moved by the spring |1 against the tension Valve port42 communicates with a chamber 44 1
of the spring 3| and said pressure to open valve in casing 40, and‘ leading from said chamber 44
24 until a new balance is established.
To vary the pressure p automatically with
3715'
changes in the temperature of the atmosphere,
the tension of the spring 3| is automatically varied
is an outlet connection 45 of any suitable char
acter that is adapted to be connected to the
evaporator;
'
v
.
‘
As here shown, valve casing 40 is a generally
L-
2,122,931
cylindrical member threaded at one end as shown
at 46, and mounted on said casing by said threads
46 is an end member 41 having an interiorly
threaded aperture 48. Threaded into 'said aper
ture 48 is an exteriorly threaded tubular mem
ber 49 having an inwardly directed ?ange 56 at
its inner end and having suitably‘ secured to its
opposite end a hand grasp 5!, here shown as a
cup-shaped member suitably attached to the end
10 of the threaded .member 49 as by soldering or
brazing. The inner end of said handgrasp 5|
has an inwardly directed flange 52 adapted to act
3
to decrease end wall 58 is moved downwardly, as
viewed in said ?gure, against the tension of
spring‘ 55, and valve member 69 __is moved away
from its seat, admitting more liquid refrigerant,
until equilibrium is reestablished.
In order to adjust the-pressure within the
chamber 44 in accordance with changes of at
mospheric temperature, means are provided for
varying the relationship between the valve mem
ber 69 and its seat 43 independently of the oper 10
ation of the pressure responsive device hereto
fore described. To this end an expansible and
as a stop for a spring-retaining plate 53. Inter
collapsible motor element is interposed between
the threaded stem 68 and the valve member 69,
said expansible and collapsible element being 15
designed to be ‘seated on the inwardly directed shown as formed by a deeply- corrugated tubular
?ange 56, is a coil spring 55 for predetermining metal wall or bellows ‘l6, suitably attached to or
the pressure to be maintained by the pressure formed integrally with end walls ‘H and 12 re
responsive device.
‘spectively connected in any suitable way to said
Said pressure responsive device, as in the em
valve member 69 and said threaded stem 68. In 20
bodiment of Fig. 1, is an expansible and col
terposed between end wall ‘H and a transverse
lapsible member, shown as a deeply corrugated, member 13 attached to the yoke 66 in any suit
tubular metal wall or bellows 56 having its outer able way is a coil spring 14 which imposes a pre
end suitably attached, as by soldering or brazing, determined tension on the expansible and col
to a ?ange member 51 which in turn is suitably lapsible element 16, said transverse member 13 25
attached, as by soldering or brazing, to the end ‘being provided with an aperture 15 through
of the casing 46. The opposite end of said ex
which the valve member 69 projects and wherein
pansible and collapsible member 56 has integral said valve member is guided in its rectilinear
therewith or suitably attached thereto a movable movements. Valve stem 68 is shown as provided
end wall 58 subjected to the pressure within the with a, passage 16 extending therethrough and 30
chamber 44. Attached to said wall 58 exteriorly attached in or suitably connected‘to said pas
thereof is an actuating post 59 and attached to sage 16 is a ?exible capillary tube ‘l1 formed into
said wall 56 interiorly thereof is a stem 60, here a-coil so that it is possessed of axial ?exibility
shown as threaded into said post 59 so as to and suitably anchored to the end wall of the
clamp the end wall 58 between the two. - Stem 66 casing 46 by a bracket 18. Said capillary tube 35
has a shoulder 6i to which the spring-retaining Tl extends through an aperture 19 in a cover
plate 53 is clamped by nut 62 threaded on, the member 86 for the. casing 46, attached to said.
projecting end 63 thereof, and the tension of the casing in any suitable way, and communicates
spring 55 may therefore be varied by threading with a bulb M of any suitable size, construction
the member 49 into and out of its aperture 48. ‘ and character and designed ta be mounted in any 40
A cover 64 for the adjusting mechanism, pref
suitable way where it responds to changes in
erably made of rubber, may be suitably mount
atmospheric temperature. As in the embodiment
posed between said spring-retaining plate 53
15 and a second spring-retaining plate 54, which is
25
30
35
40
ed on the member 41 so as to exclude atmos
of Fig. 1,, expansible and collapsible chamber 16
pheric moisture and avoid interference with
and capillary tube 11 should have a minimum
volume, and said chamber and capillary tube and 45
the bulb 6| are completely ?lled with an expan
45 proper functioning from formation of ice. As in
the embodiment of Fig. 1, the rotatable threaded
element 49 constitutes an adjustable abutment
for the coil spring 55 and predetermines the ten
sion of said spring as applied through the spring
50 plate 53 and stem 66 to the end wall 58. The
pressure to be maintained in chamber 44 is thus
predetermined by the tension of said spring 55,
and when the‘pressure responsive device is in,
equilibrium the pressure of the ?uid in the cham
55 ber 44 as applied to the end wall 58 and indicated
by p is balanced by atmospheric pressure and
the resiliency of said spring 55.
Suitably attached to the post 59, as by a cross
pin 65 projecting through an aperture in said
60 post, is a yoke 66 having its opposite end pro
sible liquid.
Upon an increase of atmospheric temperature
the expansible liquid in the bulb 8| expands,
causing an expansion of the chamber 16 against 50"
the tension of the spring 14 and moving the valve
member 69 nearer to its seat 43, whereby a lower
pressure is maintained in the chamber 44 since
a greater tension of the spring 55 is required to
effect a predetermined opening of the valve. 55
Conversely, a contraction of the liquid in the
bulb ‘8| results in a collapse of the chamber 16
under the action of the spring 14, and the valve
member 69 is moved to a position more remote
from its valve seat 43,_whereby a higher pres 60
sure is maintained in the chamber 44 since a
vided with an interiorly threaded opening 61 in
which is mounted ‘the threaded stem 68 of a smaller vtensioning of the valve 55 is required
valve member 69 movable toward and away from in order to obtain the predetermined valve
the valve seat 43. Therefore, as the pressure g opening.
55 within the chamber 44 is varied yoke 66 is moved
In order to' provide a seal where the valve stem 65
by or against the tension of spring 55 to re-posi
66 and capillary tube 11 pass through the end
tion the valve member 69 with respect to its seat of the cas‘ng 46. and also to avoid the need for
43 and reestablish a balanced pressure on the . a lock nut on the stem 68, a bellows seal 62 is
end wall 58. ' Thus if the pressure in the cham
provided between the stem 68 and the end of
70 ber 44.tends to increase, end wall 56 is moved _the casing 46. As here shown, the bellows 89- is 70
upwardly, as viewed in the ?gure, by the spring suitably attached, as by soldering or brazing, to
55, thereby moving valve member 69 toward its _ end ?anges 83 and 84, although one or both of
seat and decreasing the admission of refrigerant
" to chamber 44 until equilibrium is reestablished;
75 conversely if the pressure in the chamber 44 tends
said ?anges may be formed integrally with the
bellows 82 if preferred, and ?ange 83 is suit- '
ably attached to the stem 68, as by soldering or
4
2,122,931
appended claims for a de?nition of said inven
tion.
What is claimed is:
40 and a. ring nut 85 threaded into a threaded
1. In a refrigerating system having an evapo
aperture in the end of the casing. When ‘ring _
nut 85 is loosened the exteriorly projecting end, rator subjected to the space to be refrigerated,
of the stem 68 may be rotated so as to adjust means for compensating for changes in the
brazing, while ?ange 84 is clamped in a ?uid
-' tight manner between a shoulder on the casing
the position of the stem 68 with respect to the
yoke 66 and thereby initially predetermine the
7 position of the valve member 68 with respect to
10 its valve seat 43. The cover member 80, which
may be made of rubber, excludes atmospheric
moisture and avoids formation of ice in bellows
82 and about the coil of tube 11.
‘ In this embodiment of the invention the valve
15 member 69 closes against the pressure of the
temperature of the atmosphere outside of said
space including an expansion valve for control
ling the ?ow of refrigerant to the evaporator,
a pressure responsive device associated therewith 10
and adapted to effect the opening and closing
of said valve in response‘ to changes of ?uid
pressure in the evaporator, resilient means coop
erating with said pressure responsive device for
predetermining the ?uid pressure to be main
‘ in the embodiment of Fig. l, and the adjustment
tained thereby in the evaporator, and thermo
static means subjected to atmospheric tempera-'
for compensating for changes in atmospheric
temperature are effected ‘entirely independently
junction with said pressure responsive device to
entering liquid, instead of with the pressure as
20 of the pressure responsive device instead of by
adjustment of the differential of the oppositely
acting resilient means which predetermine the
effective ?uid pressure as in the embodiment
of Fig. 1, but as in the embodiment of Fig. l
25 the pressure to be maintained in the evaporator
is determined by the adjustment of an abutment
for the resilient means acting on the pressure
ture outside of said space and acting in con
decrease the ?uid pressure maintained by said 20
pressure responsive device in the evaporator as
the‘ temperature of the‘ atmosphere increases.
2. In a refrigerating system having an evapo
rator subjected to the space to be refrigerated,
means for compensating for changes in the tem 25
perature of the atmosphere outside of said space
including an expansion valve for controlling the
responsive member, and the pressure within the flow of refrigerant to the evaporator, a pressure
chamber 44 /is automatically varied with changes responsive device associated therewith and
30 of atmospheric temperature because under in
adapted to effect the opening and closing of 30
creased atmospheric temperature a smaller ef-, said valve, resilient means cooperating with said
fective fluid pressure is maintained within the pressure responsive device to predetermine the
pressure to be maintained thereby in the evapo~
chamber ‘M, and vice versa.
rator, means to adjust the resilient pressure act
It will therefore be perceived that by the pres
ing on said pressure responsive device to initially 35
35 ent invention means have been provided for au
predetermine the pressure to be maintained
tomatically varying the absolute pressure exist
ing in the evaporator with changes in atmos
pheric temperature, i. e. as the temperature of
the outside air increases, the pressure, and there
40 fore the temperature, in the evaporator is low
ered, so as to increase the temperature differ
ential between the outside air and the evapo
thereby in the evaporator, and thermostatic
means subjected to the temperature of the at»
mosphere outside of said space and acting in
conjunction with said pressure responsive device
to automatically decrease the fluid \pressure
maintained in the evaporator by said pressure
rator, and vice versa, and this has been effected
responsive device as the temperature of the at
by a device2 which is relatively simple in con
mosphere increases.
‘
3. In a refrigerating system having an evapo 45
rator subjected to the space to be refrigerated,
s The pressure to be maintained maybe initially I means for compensating for changes in the tem
struction and which has parts that are inex
pensive to manufacture and easy to' assemble.
predetermined by the adjustment of the abut
' peratureof the atmosphere outside of said space
ment for the resilient means which-predeter
including an expansion valve for controlling the
50 mines the action of the pressure responsive de
flow of refrigerant to the evaporator, a pressure
responsive device associated therewith and
adapted to effect the opening and closing of said
valve, 9. spring exerting a predetermined pressure
vice, and thereafter the pressure will be accu
rately and automatically varied with the atmos
pheric temperature owing to the fact that the
pressure required to close the valve is predeter
55 mined by the de?nite and invariable volumetric
expansion and contraction of the liquid in the
60
65
70
“ 75
on said pressure responsive device, a second
spring acting in opposition to said first named 55
spring andr cooperating therewith whereby the
pressure to be maintained by said pressure re
bulb' subjected to atmospheric temperature.
sponsive device in said evaporator is determined
While the embodiments of the invention illus
by the difference in pressure exerted 'on said
trated on the drawings have been described with pressure
responsive ‘device by said two springs,
considerable particularity, it is to be expressly ' and thermostatic'means subjected to atmospheric 60
understood that the invention is not to be re
temperature outside of said space for auto
stricted thereto, as the same is capable of re
matically varying the adjustment of one of said
ceiving a variety of mechanical expressions, some springs to vary the difference in pressure exerted
of which will now readily suggest themselves to by said springs on said pressure responsive de
65
those skilled in the art, while changes may be , vice to decrease the pressure in said evaporator
made in the details of construction, arrangement as a compensation for an increase in the tem
and proportion of the parts 'without departing perature to which said thermostatic means is
from the spirit of the present invention. Nor is subjected.
the invention to be restricted to' the particular
4. In a refrigerating system having an evapo 70
use selected for Jexemplifying the utility of the rator subjected to the space to be refrigerated,
construction described, as embodiments of the means for compensating for changes in the tem
present invention may be applied to other uses perature of the atmosphere outside of said ‘space
as will now be apparent to those skilled in the including an expansion valve for controlling the
art. Reference is therefore to be had to the flow of refrigerant to the evaporator, a pressure 75
2,122,931
5
responsive device associated therewith and sub
jected to the pressure in the evaporator for
with said ?exible member, a. second spring co
operating with said ?exible member and acting in
e?ecting the opening and closing of said ‘valve, - opposition to said ?rst named spring whereby the
a spring exerting a predetermined pressure .on pressure to be maintained is balanced by the
said pressure responsive device, a second spring difference in pressure exerted by said springs on
acting in opposition to said ?rst named spring said ?exible member, a movable abutment in
and cooperating therewith whereby the pressure dividual to one of said springs, and thermostatic
means subjected to atmospheric temperature
to be maintained by said pressure responsive de
vice is determined by the difference in pressure outside of said space for-varying the position of
10 exerted on said pressure responsive device by said abutment to decrease said difference in pres 10
said two springs, and thermostatic means sub
jected to atmospheric temperature outside of said
space and cooperating with said second named
spring to vary its adjustment and decrease the
15 differential action of said springs on said pres—
sure responsive device as the temperature ‘of the
‘atmosphere is increased.
5. In a refrigerating system having an
evaporator subjected to the space to be re
20 frigerated, means for compensating for changes
in the temperature of the atmosphere outside of
said space including an expansion valve for con
trolling the flow of refrigerant to the evaporator,
a pressure responsive device associated therewith
25 and subjected to the pressure in the'evaporator
for eifect'ing the opening and closing of said
valve, a spring exerting a predetermined pressure
on said pressure responsive device, a second spring
acting in" opposition to said ?rst named spring
30 and.cooperating therewith whereby the pressure
to be maintained by said pressure responsive de
vice is determined by the difference in pressure
exerted on said pressure responsive device by said
two springs, a motor element providing a movable
35 abutment individual to said second named spring,
and a bulb subjected to atmospheric temperature
outside of said space and communicating with
said motor element and constituting therewith a
thermostatic device for moving said abutment
40 and varying the adjustment of said second named
spring to decrease the diiference in pressure of
said springs on said pressure responsive device
as the temperature to which said bulb is sub
jected is increased.
45
'
'
6. In a refrigerating system having an evapora-_
tor subjected to the space to be refrigerated,
means for compensating for changes in the tem
perature of the atmosphere outside of said space
including an expansion valve for controlling the
?ow of refrigerant to the evaporator, a ?exible
member associated with said valve and subjected
to the pressure in the evaporator, a spring acting
in opposition to said pressure and cooperating
with said ?exible member, a second spring co
55 operating with said ?exible’ member and acting
in opposition to said ?rst named spring whereby
the pressure to be maintained is balanced by the
60
65
70
75
sure as said temperature increases.
8. In a refrigerating system having an evapo
rator subjected to the space to be refrigerated,
means for compensating for changes in the tem
perature of the atmosphere outside of said space 15
including an expansion valve for controlling the
?ow of refrigerant to the evaporator including a
valve casing provided with a valve seat, a valve '
member cooperating with said seat, a ?exible
member associated with said valve and sub 20
jected to the pressure in the evaporator, opposed
resilient means cooperating with said ?exible
member and exerting a differential pressure
thereon in opposition to the pressure of said
?uid, a movable abutment individual to one of 25
said resilient means, a motor vessel associated
with said movable abutment, and a bulb subjected
to atmospheric temperature outside of said space
and communicating with said motor vessel, said
bulb and motor element being?lled with an ex
30
pansible liquid whereby increase of temperature
at said bulb expands said liquid and moves said
abutment to decrease said di?erential and de
crease the ?uid pressure in said evaporator re
quired to maintain a balance on said ?exible '
‘member.
9. In a refrigerating system having an evapo
rator subjected to the space to be refrigerated,
means for compensating for changes in the tem
perature of the atmosphere outside of said space 40
including an expansion valve for controlling the
?ow of refrigerating ?uid to the evaporator in
cluding a valve casing provided with a valve port,
a valve member cooperating with said port and
provided with a valve stem, a ?exible member 45
subjected to the pressure in said evaporator and
associated with said stem, a spring cooperating
with said ?exible member and tending to move
said valve in opposition to the pressure of said
?uid, a second spring cooperating therewith to 50
mdve said valve in opposition to said ?rst named
spring whereby the pressure of said ?uid required
to maintain a balance on said ?exible member is
determined by the difference in pressure of said
springs, a movable abutment individual to one of 55
said springs, and thermostatic means subjected
to atmospheric pressure outside of said space and
di?erence in pressure exerted by said springs on . associated with said abutment for moving the
said ?exible member, and thermostatic means same to vary the adjustment of said last named
subjected to atmospheric temperature outside of .spring in conformity with ?uctuations of the
said space for automatically decreasing the temperature to which said thermostat is sub
difference in pressure exerted by said springs up
jected whereby the di?erence in pressure exerted
on increase of temperature at the thermostatic by said springs is decreased in conformity with
means thereby to automatically vary the pres
increases of atmospheric temperature.
sure which will maintain a balanced pressure on
10. In a refrigerating system having an evapo
said ?exible member.
Irator subjected to the space to be refrigerated,
7. In a refrigerating system having an evapo
means for compensating for changes in the tem
rator subjected to the space to be refrigerated, perature of the atmosphere outside of said space
means for compensating for changes in the tem
including an expansion valve for controlling the
perature of the atmosphere outside of said space ?ow of refrigerant to the evaporator, a pressure
including an expansion valve for controlling the responsive device associated therewith and sub
?ow of refrigerant to the evaporator, a ?exible jected to the pressure in the evaporator for
member associated with said valve and subjected . eifecting the opening and closing of said valve,
to the pressure in the evaporator, a spring acting resilient means cooperating with said pressure
in Opposition to said pressure and cooperating responsive device to predetermine the pressure
60
65
70
75
v e
2,122,9s'1
'
to be maintained thereby, and thermostatic
pendently of but in conjunction with said pres
means subjected to ‘the temperature of the at
sure responsive device to decrease-"the ?uid pres
sure required to close said valve as the tempera
ture of the atmosphere increases.
13. In a refrigerating system having an evapo
rator subjected to the space to be refrigerated,
means for compensating for changes in the tem
perature of the atmosphere outside of said space
including an expansion valve for controlling the
flow of refrigerant to the evaporator including a 10
valve member and its seat, a pressure'responsive
mosphere outside of said space and cooperating
with said resilient means to automatically de
crease the resilient pressure exerted by said re
silient means on said pressure responsive device
as the atmospheric temperature increases where
by the pressure maintained by said pressure re
sponsive device in the evaporator is respectively
decreased and increased as the atmospheric tem-,
perature increases and decreases to compensate
for said changes in atmospheric temperature.
device associated therewith and subjected to the
pressure in the evaporator for effecting the open
11. In a refrigerating system having an evapo
rator subjected to the space to be refrigerated, ing and closing of said valve in response to
is means for compensating for changes in the tem changes of ?uid pressure, resilient means coopperature of the atmosphere outside of said space erating with said pressure responsive device for
including an expansion valve for controlling the opening and closing said valve upon predeter
flow of refrigerant 'to the evaporator including a ' mined changes in the ?uid pressure acting on
valve member and its seat, a pressure responsive said pressure responsive device, and thermostatic
means subjected to atmospheric temperature out
20 device associated therewith and subjected to the
pressure in the evaporator for eifecting the open‘ side of said space for relatively moving said valve
ing and closing of saidv valve in response to member and its seat to decrease the eifect of said
changes of ?uid pressure, opposed resilient means resilient means on increase in the‘ temperature
cooperating with said.‘ pressure responsive device to which said thermostatic means is subjected
and vice versa whereby changes of temperature
25 for opening and closing said valve upon prede
termined changes in the fluid pressure acting on at said thermostatic means modify the fluid pres
sure maintained in said evaporator to compensate
said pressure responsive device, a connection be
r
_/
tween said pressure responsive device and said for said changes.
14. In a refrigerating system having an eva valve member including a movable abutment for
30 one of said resilient means, and thermostatic rator subjected to the space to be refrigerated,
means subjected to atmospheric temperature means for compensating for changes in the tem
outside of said space and acting on said movable perature of the atmosphere outside of said space
abutment to vary the adjustment of said resilient including an expansion valve for controlling the
means and decrease the fluid pressure required flow of refrigerant to the evaporator including
a valve member and its seat, a pressure responsive
35 to maintain a balance of pressures on said pres
sure responsive device as the temperature of the device associated therewith and subjected to the
pressure in the evaporator for effecting the open
atmosphere increases.
‘
I
12. In a refrigerating system having an evapo~ ing and closing of said valve in response to
rator subjected to the space to be refrigerated, changes of ?uid pressure, opposed resilient means
cooperating with said pressure responsive de—
40 means for compensating for changes in the tem
‘ perature of the atmosphere outside of said space vice for opening and closing said valve upon
including an expansion valve for controlling the predetermined changes in the ?uid pressure act
flow of refrigerant to the evaporator, a pressure ing on said pressure responsive device, an ad
justable abutment for one of said resilient means,
responsive device associated therewith and sub
and thermostatic means subjected to atmos
45 jected to the pressure in the evaporator for ef
fecting the opening and'closing of said valve in pheric temperature outside of said space and act
response to ct. ‘1885 of ?uid pressure, resilient ing upon increase in temperature to adjust said
abutment and decrease the effect of said resilient
, means cooperating with said pressure responsive
device for opening and closing said valve upon means whereby an increase in said temperature
is accompanied by a compensatingdecrease in
predetermined changes in the ?uid pressure act
50 ing
pressure in said evaporator.
on said pressure responsive device, and ther
mostatic ‘means subjected to atmospheric tem
perature outside of said space and acting inde
~
JOHN E. DUBE.
15
20
25
35
'
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 210 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа