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Патент USA US2124620

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July 26, 1938.
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I
J. KIRGAN
coN'T'RoL'MEANs
FOR
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THERMO-COMPRESSORS
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2,124,620
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Filed Feb. _l6, 1937
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INVENTOR.
- John [fir-jazz,
BY
Hrs’ ATTORNEY
Patented July 26, 1938
2,124,620
UNITED STATES PATENT OFFICE ’
2,124,620
CONTROL MEANS» FOR THERMO
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COMPRESSOR-S
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John Kirgan, Easton, Pa,, assignor to, Ingersoll
Rand Company, Jersey ‘City, N. J., a corpora
tion- of New Jersey
I Application February'16, 1937, Serial No. 125,996 a
4 Claims. ,(Cl. 230-111)
.
This invention relates to thermo-compressors, vwith a diaphragm 24 against which pressure
and more particularly to devices acting respon
may be applied for moving the valve IS in opposi
sively to pressure conditions in a thermo-compres
tion to the spring 23. A casing 25 to which the
sor to control its operation.
diaphragm is affixed, forms a chamber 26 be
A few of the objects of the invention are to
prevent waste of power in a thermo-compressor,
and to assure positive control of the power supply.
Other objects will be in part obvious and in
part pointed out hereinafter.
In the drawing, in which similar reference
characters denote similar parts,
Figure 1 is a view, in elevation and partly in
section. of apparatus embodying control 'means
constructed in accordance with the practice of
’ the invention, and
Figure 2 is a similar View showing a modi?ed
form of the invention.
Referring more particularly to the drawing and
especially to Figure 1, the invention is shown
embodied in a refrigerating system comprising
an evaporator, fragmentarily shown at II], a con
denser I I, and a thermo-compressor, indicated in
general by I2, connected to convey vapor from
the evaporator to the condenser.
The thermo-compressor may be of any desired
construction, and is shown as including a casing
l3 forming a passage°|4 opening at one end into
the evaporator l0 and at the other end into the
condenser ||. Discharge nozzles for steam or
other power ?uid, one being shown at l5, are posi
tioned in the passage |4 near the end which opens
into the evaporator. The casing l3 may be sealed
around the nozzles in any well known manner,
and a pipe I6 provided with a control valve |1
, will serve to convey steam to the nozzles.
In practice both the evaporator l0 and con
denser I I may be kept under high vacuum by the
compressor | 2 and by a condenser vacuum pump
(not shown), and refrigerant exposed to the vac
11 O uum in the evaporator may be partially vaporized
and chilled for refrigerating purposes.
In accordance with the practice of the inven
tion, and to obviate waste of power in the com
pressor, suitable means are provided for auto
matically and accurately controlling the amount
tween itself and the diaphragm, and a pipe 21
serves to convey suitable pressure ?uid, com
pressed air, for example, from an external source
(not shown) to the chamber 26. A small vent
29 in the casing 25 serves to prevent trapping
10“
of pressure ?uid in the diaphragm chamber.
A control member comprising a valve 28 and
a valve casing 30, is interposed in the pipe 21 to
determine the pressure of the ?uid delivered to
the chamber 26. This valve is shown as of the
needle type, and the stem 3| of the valve extends 15
outside of the valve casing and may be provided
with a collar 32 to serve as an abutment for a
spring 33. The spring also bears against the
casing 38 and acts to urge the valve 28 toward
open position.
,
A pressure-responsive device for actuating the
valve 28 is illustrated in the form of a U-shaped
manometer vessel 34 in which is placed a. quantity
of mercury 35 or other ?uid medium. One'arm
of the manometer forms a chamber 36 which may
be sealed, or if desired, placed in communication
with the evaporator ID or the inlet to the thermo
compressor passage I4. The other arm of the
manometer forms a chamber 31 into which a pipe
38 leads from the condenser II or from a. point ,
near the outlet of the passage l4.
A piston or ?oat member 39 is preferably posi
tioned in the chamber 31 to be actuated by the
mercury 35. A rod 40 connected to the ?oat ex
tends through a gland to the outside of the vessel
34, and a rod 4| is pivotally connected at one end
to the ?oat rod 48 and at its other end to the
stem 3| of the valve 28. The rod 4| is also ful
crumed, as indicated by 42, intermediate the
aforesaid pivotal connections to enable the mo
tion of the ?oat 39 to» be transmitted from the rod.
40 to the valve stem 3|.
In operation, the inlet and discharge pressures
of the thermo-compressor |2 will rise or fall as
the amount af vapor formed in the evaporator I0 .»
increases or decreases due to variations in refrig
erating load, or as the pressure in the condenser
of steam admitted to the nozzles |5. In its pre
ferred form, a throttle valve I8 is interposed in
the steam supply pipe l6 and arranged to be varies due to changes in cooling water tempera
automatically controlled by a power medium, the ture, for example.
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strength of which is varied in accordance with
The mercury in the chamber 31 will be sub- "
pressure conditions in the compressor.
jected to whatever pressure conditions exist at
In the construction illustrated, the valve I8 the, discharge end of the compressor, and the
is within a casing l9 and is preferably provided - chamber 36 may be under vacuum, as by prior
with a stop 20 to prevent its complete closure. ?lling of the manometer with mercury and in
55 The stem 2| of the valve extends outside of the
verting to the position shown. When the dis
casing l9 and terminates in a head 22 to provide charge pressure increases, the mercury will be
an abutment for a spring member 23 which bears depressed in the chamber 31 and forced into the
against the casing 9 and acts to urge the valve chamber 36. The ?oat 39 will fall and its mo
toward open position.
tion will be transmitted by links 48 and 4| to
The head 22 of the valve stem is in abutment 7 move the valve 28 toward closed position. Less 60
60
2,124,620
pressor is well known to be constant for a given.
' pressure ?uid will now be supplied to the chamber
26 and the spring 213" will actrto urge the valve i8
' suction pressure, and the power supplied to the
‘compressor needi'only‘be increased if the suction
pressure decreases; the discharge pressure. in
to that of the’ steam supplied to the valvel8, will _ creases, or'the differential between the two pres’
toward’open
Thus'more positiomlj
steam ‘at a pressure somewhatcloser
be delivered to the nozzles l5, to enable‘the com ‘sures increases.‘ In the present invention these
pressor I2 to overcome the increased.vdischargey,ry ,pressure.v ?uctuations are made use of to effect
pressure.‘ Whenthe condenser pressure again -' ‘stepper steam to the compressor only in the ,
decreases, the pressure onthe diaphragm 22 will {amounts necessary, and‘ waste of steam is thus
'10 be increased to move thevalve l8' toward’closed"
pl‘révelntfed-‘v
’ position, and thusthe stean'ii maybe regulated in’ " "
accordance with the'demand therefor; '
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"I‘t1will'belapparent to, those skilled in the" art
to‘ which this invention appertains that other
,_
If it is desired that'the ,valve 18' be actuated " arrangements and combinations may be made for
in accordance with the pressure differentialybe-s- _ accomplishing like results.- It will be understood,
15
tween the inlet and discharge ends ofitheipas
'7 thereforathat the scope and spirit of the inven:
sage I 4, connection (not shown). may be made be
,tion is not to be limited to the speci?c vforms
,described, but is to be interpreted only by the
tween the manometer chamber 36 and the evapo- ’
terms-in which the appended'claims are. ex
rator 10, and the mercury will, in- this instance,
- move from one manometer chamber to the other ~
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pressed.
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20 and actuate the ?oat ~38 as the said pressure dif
ferential
varies,
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In the modi?cationillustrated in Figure 2 the
manometer is formed by. two separate vessels 43
' 1, The combination vwith a thermo-compressor,
and means to admitpower ?uid to the compressor
including a control member, of means to admit a
power medium to the control member for actuat
and 44 :connected by a ?exible tube 5| and’ con
25 taining a quantity of mercury'35.v The vessel 43 .ing the same, a U-shaped vessel for a trans 25'
is supported in a ?xed position and the. other mission medium, means actuated by the trans
vessel 44, is movable vertically in a. guideway 45. ' mission medium to control the last-named means,
VA part-li?extends from the bottom of the movable .means communicating between the vessel and the
,vessel and carries a rod- ?‘lpivotally‘ connected to ‘compressor to subject thejtransmission medium
solely. to the total discharge pressure of the com
30 the rod 451 for actuating the valve 28,'and a head
pressor, thereby to actuate ‘the transmission
48 at the end of the rod 41 forms an“ abutment
against which a spring 49 bears to resist the down- ,
ward movement of the vessel :44.
35
The vessel 43 encloses a chamber 36’ which’
may be sealed, or if desired, placed in communica
tion with the evaporator. 10, and the vessel 44
lencloses'a chamber 31’ which isconnected by a
'?exible tube 50~withthe>condenser l3. The ?exi
ble tube 5| between the-chambers 36’, and 31"con
~nects the bottoms thereof and serves as a pas
sage for conveying the mercury 35 from. one
chamber to the other; j
'In _ operation,
when
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condenser ' pressure
in
creases the mercury is‘displaced .fronrthe cham
ber 31' into the chamber~3,6’ and theweight of the
movable vessel,“ and‘ its contents is decreased.
The spring 49 then causesthe container 44 to
rise and the valve 28 to move toward‘clo'sed
"position, and this-in turn decreases the pressure
‘acting on the diaphragm 24vto-cause'the valve 18
:to bemore fully opened.
7
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'In thermo-compressors which operate at both
inlet and discharge under high vacuum such as is
medium.
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2,. The combination with a thermo-compressor,
and'means to admit power. ?uid to the’ com?
pressor including a control member, of means to
admit a power medium to the control member for
actuating the same, a U-shaped vessel containing
a transmission medium, means actuated by the
transmission medium to control the last-named
vmeans, means to seal one arm of the vessel, and
means communicating between the other, arm of
the vessel and the compressor to subjectthe trans
mission medium solely to the total discharge pres
sure of the compressor thereby to actuate the
_ latter medium.
3. The combination With'a thermo-compressor,
and means to admit power ?uid to-the compressor »
including a control member, of means to admit
a power medium to the control member for ac
tuating the same, a device to control the last
named :meanspseparate vessels having a con
nection for‘transmitting a ?uid medium there
between, and means to subject the ?uidmedium '
inethe vessels to pressure conditions in the com
it has‘ been found that the. ?uctuations in the ;pressor for displacingthe ?uidmediumirom one
'inlet and discharge pressures are of suchsmall. vessel to ‘the other, one of said vessels being in
encountered in water-vapor refrigerating systems,
magnitude, that they cannot be conveniently di
rectly appliedto actuatedevices .for controlling
the ?ow of steam to the compressor.
60
Accord
ingly, provision is made for multiplying the varia
tionsrin these pressures; and vfor using the ,in
creased variation to controls. suitablepower
?xed position, and the other vesselbeing mov—j
able and having connections to control said de
vice in accordance with the amount of ?uid
medium present in the latter vessel.
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4. The combination with a thermo-compressor,"
and ,aimeans-to admitpower ?uid to the com- _
including .a control member, of a'means
medium for, actuating, an automaticsteamivalve 'pressor
to admit a power medium to said control member
[8. The multiplied pressure variations give a
65 very‘sensitive control, and the power medium;
illustratively disclosed herein as pressurev ?uid,
can be conveyed ,for substantial. distances with
out appreciable loss of e?ect, thereby, assuring
for actuating thev same, a device comprising a 65
pair of inter-communicating vessels containing a
liquid having connections whereby the level of
the liquidlin the vessels ?uctuates solely inac
cordance w-iththe total discharge pressure of the
positive control of the power supply and enabling
the pressure-responsive manometers to be posi compressor, and means acting to control‘the ad- . 0
tioned as close to the controlling pressures as is
mission means in response to variations of said
practicable.
liquid level.
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'rThe evacuating capacity of a thermo-com
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JOHN KIRGAN.
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