US1572858A - Flooded horizontal refrigerating coil - Google Patents

Description

Feb. 9 i926.

Filed April 2 1925 E S HALSEY FLOODED HORIZONTAL REFRIGERATING COIL Patented Feb. 9, 1926.

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v *FLOODED HOBIZONTAL nnrmennarmecom' Application filed April- 25, 1925. Serial No. 25,827. Y

To all whom, it may concern f i 7 Be it known t-hat I. EDWARD HALsEr,

acitizen of the United States, residing atlVashington, in the District, of Columbia, have invented certain new and useful Improvements in Flooded Horizontal Refrigerating Coils, of which the following is a specification.

The nature of my invention is an elongated horizontally disposed refrigerating coil unit constituted by a compact, continuous series of pipe convolutions preferably .in'the form of a spirallywounddielix, the ends of which pipe connect with a common float chamber, one of said pipe ends "entering below the floatcontrolledrefrigerant liquid level and the -=.other end connect-ing at a higher point preferably above the liquid level. so that the v liquid-can-enter the lower end of pipe by gravity within the lower branch of the pipe and adjacent to the liquid entranceis provided; a [sensitive floating check valve, so that as soon as ebullition is established by the starting up of. a connected compressor-condenser unit (not shown) the agitation from "the expansion and intermittent recessionsof the gas pressure in the lower branch of the pipe will chatter the valve intermittently, seating it and forcing "the gas and liquid-through the successive convolutionsof thefpipe coil and thence back into the upper portion of the float chamber by an intermittent pumping action.

Formerly-it has not-been? found feasible to operate long'pipe coils formed in aseries ofla-teral convolutions from a flooded chamberlof constant level on account of the air or, gas-trapping action of each convolution, especially soiwhen the top; end of any one of all ;convolutions-- extend above, the liquid level maintainedzby; thee-float. For this reason :in commercial applications of the flood? system it has been necessary to form. the refrigerating loops below the liquid level, and 'lead' fi'equenkgas vents .from them. up to the: fioa-trchamberr: ,"III spite of: this dis-Z advantage,-;=the flOOdSYStGHIalIZIS certain deided advantages ov'er that of the expansion. v alvesystem of -.continnous- 1ilowpressure; such as the utilization of a lo.wpressure controlsli-ighenxa'vel age'zefliciency and more rapidfidepressiomofwtemperatur: ,1;

vTl-ie .iobjec-tsf of: theaprresent::invention are to provide anreificient and symmetricallong and' slender. horizontal refrigerating r coil; onv

'ing aconventional float-controlled valve V the flood system tosupply an urgent need. for various commercial installations in which .no present known form of cooling. unit is well adapted or possible of application, such as glass display counters now iced from long, slender ice troughs across the full length at the back of glassvdisplay' counters. Further, the invention contemplates a unit which can be suspended close to the top and extend the full length ofthe counter and v which may be provided with a drain trough attached so aswto make attractive display withoutinterference with the food display space beneath it. v Further objects, arethe' provision of long unitsadaptable to market boxes in which .an overhead ice bunker extendsthe entire length of the box and into which one or more of the coils can be suspended across the top or to one side, leaving adequate space for the storage of food or ice.

Still further objects are, economical 0011- struction and the convenience of designing flat wall coils or frosted coil pipe words for window display.

In the drawings:

Figure 1 is a side elevation partly in section of my preferred form of refrigerating coil unit. I

t Fig. 2 is an enlarged detail View of the inlet end of the pipe in which the check valve is located.

Fig. {3 is a section on line 3-3, of Figure 1, and I v v Fig. 4 is a side elevation of a modification of my invention in which thepipe coil is laid in a fiat plane.

Referring in detail, to the drawing, C represents a cylindrical float chamber havoperated by the. levenfloat F.. This float valve is; fedtromhthe compressor; through the liquid line indicated-wand thergas irom this chamber-is exhausted-by a; compressor -Sh n)" ne te -w e gasout et pip designated on the drawing. This-portion of. the apparatus is nowemployed lay-the com mercial machine known as Frigidaire ,gIn carrying, out-tiny impr vements I empl y for .my 1 preferred 1 construction the :helically coiled: pipe 1, the lower ibranch; e d Qiiylhich. returns" .within' the convolutions; of the coils to the float chamber-below thejgliquid leytel: determinediby :the'floatas indioa-ted atf 2. The other. end; 10f; .CQil; .enteifsthe} float.

seated or unseated. Thevalve seat may be formed by a union joint between the seat and pin to provide convenient inspection or replacement of the ball. The "helical coil is made rigid and secured to the float chamber 'by means of three spaced rods 8 soldered respectively to each convolution of the coil.

Soldered to the lower horizontal branch of the coil is a heat-absorbing fin 7 of sheet copper soldered to the coil by a series of lugs 9. The function of this heat-absorbing fin is to concentrate the transmission of heat to the lower liquid filled 'branch of the coil at its points of juncture therewith, thereby concentrating and accelerating ebullition at these points. The metal drip trough 10, desirable if the coil is suspended directly over produce on display and being attached by copper straps making intimate thermal contact to the coil, it also acts: as a heat absorbing surface to augment or substitute the effect of thatof fin 7 just described. From this construction it is obvious that at each spasmodic expansion of gas in this lower branch the check will be closed and a portion of its liquidcontents will be discharged with gas into one of the succeeding convolutions and upon a recession of each gas convulsion the ball will be unseated, allowing a new portion of li uid to pass the check valve, thus establis ing a repeating intermittent pumping action and consequent circulation throughout the coil, thereby discharging any air or gas that may accumulate in the upper portion of the pipe convolutions into the float chamber, from whence they are withdrawn by the come pressor in a continuous cycle.

The modification shown by Figure 4 is introduced to indicate that the coils may be made up into various shapes, such as word writing or flat coils, as may be desired.

Also the coils ma be wound of larger diameter than the oat chamber and the float chamber be enveloped by the convolutions of the coil, and is obviously subject to many other modifications.

,What I claim is: I

1. An evaporator comprising a refrigerating float chamber; means for maintaining a constant refrigerant level in such chamber; a refrigerating coil having a series of traps extending outwardl from said chamber in a closed circuit t erewith; one end of said coil connecting tosaid chamber be:

low the liquid level therein and its other end entering said chamber above the liquid level; a check valve in the coil adapted to restrict flow of the liquid in one direction;

a liquid supply pipe connected to said chamber, and means for conducting vaporized refrigerant from said chamber whereby the continuous exhaust of vapor from said chamber w1ll.cause spasmodic convulsive ebullition in the lower portion of each succeeding tra of said circuit with intermittent seating and unseating'of said valve to cause Hour of all alternate slugs of liquid and gas throughout said closed circuit in a continuous flow. a

2. An evaporator comprising a refrigerating float chamber; means for maintaining a constant refrigerant level in such chamber; a continuous conduit having a series of traps extending outwardly from said chamber and having an end connected to said chamber below the liquid level therein and having a second end connected to said chamber above the li uid ,level, movable means to restrict flow o the fluid in one direction through the conduit, and means for conducting vaporized refrigerant from said chamber to effect spasmodic convulsive ebullition'of liquid in the conduit with intermittent movement of said restricting means to effect flow of alternate slugs of liquid and gas throughout the conduit in a continuous 3. An evaporator comprising a refrigerating float chamber; means for maintaining a constant refrigerant level in such chamber; a refrigerating coil having a series of traps extending outwardly.) from said chamber in a closedcircuit, therewith; one end of said coil connecting to said chamber below the liquid level therein and its' other end entering said chamber above the liquid level; a check valve in the coil adapted to restrict flow of the liquid in one direction; a liquid supply ipe connected to said chamber, means or conducting vaporized refrigerant from said" chamber whereby the continuous exhaust of vapor from said chamber will cause spasmodic convulsive ebullition in the lower portion of each succeeding convolution of said circuit withintermittent seating and "unseating tion at parts of' a rcfrigorati said chamber and having an end connected to said chamber below the liquid level therein and having a second end connected to said chamber above the liquid-level, movable means to restrict flow of the fluid in one direction through the conduit, and means for conducting va from said chamber-to e ect spasmodic convulsive ebullition of liquid in the conduit with intermittent movement of said restricting means to effect flow of alternate slugs of liquid and gas throughout the con- 'duit in a continuous flow, and heat-absorbing means associated with the conduit to effect heating of the liquid and thereby ac-.

celerate ebullition.

5; evaporator comprising a refrigerating float chamber; means for maintaininga constant refrigerant level; in such chamber; a continuous, conduit having. a

.series of traps extending outwardly from' said chamber and having an end connected to said chamber below the liquid level therein and having a second end connected to said chamber above the .liquid level, movable means to restrict flow of the fluid in one direction, through the conduit, means- -"for conducting vzgm ri'zed-refrigerant from said chamber to e ect asmodic convulsive ebullition of liquidin t e conduit with .in-

terniittent movement of said restricting- -means to efiect flow of alternate slugs of liquid and gas throughout the conduit in a continuous'flow, and. a combined drip collector and heat absorbing means associated with the conduit.

6. An evaporator comprising arefrigerating float -chamber; means for maintaim ing .a constant refrigerant level in such chamber; a continuous conduit having a series of traps extending outwardly {from said chamber and having an end connected rized refrigerant "pended in a body 0 plate dispose 'in and having a second end connected to said chamber above the liquid level, movable means to restrict flow of the fluid in one direction through the conduit, means for conducting vaporized refrigerant from said chamber to eifeet spasmodic convulsive ebullition of liquid in the conduit with intermittent movement of said restricting means to effect flow of alternate\ slugs of liquid and gas throughout the conduit in a continuous flow, and a combined drip collector and heat absorbing means thermally connected to'the' conduit at a plurality of spaced points so as to accentuate convulsive ebullition at such concentrated points.

7. In combination with a refrigerating unit, a refrigerating eva orating duct.conne'cted therewith ada te to be freely susvertically di osed .cuprous heat absorbing close and substantially parallel to said duct and in intimate thermal contact with said duct at a plurality of points along its length, whereby the heat;

absorption creased. 7

8. In combination with a refrigerating unit, a refrigerant evaporating duct connected therewith, and arranged to facilitate a free downward circulation of air past it, a relatively wide and vertically dlsposed metal heat absorbing fin arranged parallel property of said duct is indownward convection currents of the surrounding air, the absorption of heattherefrom and to'increase egaporation of the refrigerant in' the rtion of. said duct ifaihermally united with said heat absorbing n.

In testimon whereof I afiix m signature. y EDWARD S. H ALSEY.

airto be cooled, a

with and soldered to said duct to accentuate

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