US1867748A - Refrigerating apparatus - Google Patents

Description

2 SheetsSheet 2 u June-"fez y D. E. MAccABEE REFRIGERATI-NG' APPARATUS Filed July 31, 1928 modities of different characters are main.

- clearly shown.

Patented July. 19, 1932 J UNITED STATES PATENT OFFICE DAVID E. MACCABEE, or narrow, omo, 'assrenoa r0 rmexnamn conrona'rron, or

- narrow, 01110. A conronarron or nnmwaan' REB'BIGEBATING :APPABATUB Application filed July a1, 1928. Serial Ira 296,492.

This inventionrelates to refrigerating apparatus and particularly to soda fountains and similar devices in which var1ous comtained at diiferent temperatures. I

It is one of the objects of the inventionto provide a simplified and economical refrigerating system particularly adapted to soda fountains.

Another object of the invention is to provide an improved and. simplified arrangement for maintaining a number of different temperatures by means of a single refr1g-' erating system. i r

More specifically it is one of the ob ects of the invention to operate a plurality of evaporating elements in series and to ,provide an improved and simplifiedmeans for controlling the amount of liquid refrigerant which enters successive evaporators of the series.

Further objects and. advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is In the drawings:

Fig. 1 is a di am of a refrigerating system embodying t e present invention;

"Fig. 2 is a plan view of a soda fountain havin a refrigerating system constructed in acco ance with the invention; and

Fi 3 is an end elevation of the same.

It is usual to rovide soda fountains with a com artment or storing ice cream which shoul be kept at a temperature of F. or less, a compartment for storing and cooling water on draft which should be maintained'at a temperature of around 40 and a compartment for containers of fountain syrups, fruit juices and the like, commonly called a syrup rail, which should be main tained at a temperature of 559 F. or less.

My invention is concerned withan improved arran ement and method'for mamtaining the a ove mentioned compartments at their individual proper temperatures by means of a single,refr1gerating system or apparatus. i

Referring to Figs. 2 and 3 of the drawin 10 designates an suitable soda fountam which is provide with an ice cream compartment 11, a water compartment 12 and a syrup rail 13 for holding the syrup containers 14. Each of the compartments may be suitably insulated according to the temperatures at which it is to be. maintained. A relatively high pressure evaporator 16 is placed in the water compartment and a relatively low pressure ev'aporatorfl'l placed in the ice cream compartment. Referring to Rig. 1, these evaporators are preferably of the flooded type and each include a header 20 forming a reservoir for liquid refrigerant which is kept at a constant level thereinunder the control of a float valve 22, and refrigerant circulating tubes or coils 23. The evaporators are supplied with liquid refrigerant through liquid lines 26 and-27 connected in parallel to a condensing element generally denoted by 28 which also withdrawsevapov and described in the application of Ernest Dickey Serial No. 7 53,048, filed December 1, 1924. This valve is opened by the pressure elf-refrigerant in the evaporator 16 and automat-ically closes at some predetermined low pressure corresponding, for example, to 35 F. and thus prevents refrigeration of the evaporator below that temperature.

- The condensing element 28 includes any suitable compressor 32 actuated by a motor 33 under the control of a switch 34 which is oper'atedin response to thepressure existing.-

in the va or conduit 29.--- When the pressure existing in this conduit is, above that corres ending to a'temperature of. about"5F. 08. t e switch closes to actuate the'compressor and withdraw the refrigerant from the evap-- 34 orator 17 until the pressure has been reduced to a value corresponding to a predetermined low temperature, for example zero degrees;

' from evaporator 16 only when the pressure regulating valve 81 is open, that is, when the,

temperature of 16 is above 35 F.

The conduit 30 connecting the evaporator 16 and the exhaust conduit 29 includes a portion forming the condensin coil 34' which'is in thermal relation with t e evaporator 17 and a portion 35 forming an evaporator which is in thermal relation with thesyrup rail. Preferably the evaporator 17 is immersed in a non-freezing solution such as brine as is usual in cases of this character,

'and the condensing conduit, 84 is also immersed in the brine.

Whenever refrigerant is withdrawn from the evaporator 16 under control of the pressure regulating valve 31, this refrigerant will be for example at a temperature of 35 F. an a pressure of about 9 pounds .per square inch auge The refrigerant comes in contact with the brine at a temperature, for example of 7 F. This is, of course, cold enough to condense some or a of the refrigerant at this or a lower pressure. The condensed refrigerant is therefore drawn into the conduit 35 associated with the syrup rail and is there evaporated, supplying refrigeration for the syrup. The evaporated refrigerant is finally drawn into the com ressor to be condensed and circulated throug the system again. The temperature at which the syrup rail is maintained is regulated by the amount of refrigerant which is evaporated in a unit of time in the coil 35. This is in turn controlled by the amount of liquid refri erant which is condensed in the coil 34'. ince under certain conditions all of the refrigerant condensed in the coil 34 may not be eva rated in the coil 35 it is desirable to rovidg means for reventing the remaining quid refrigerant fi om being drawn into the vapor conduit 29. This is accomplished by connectin the coil 35 to the conduit 29 through 1: e header 20 of the evaporator 17 as shown in Fig. 1. The header thus forms a trap which collectsany liquid refrigerant discharged from the conduit 35 and permits only gaseous refrigerant to be drawn into the conduit 29.

The above described system provides a very simple and reliable method of coolin the syru rail of a soda fountain and 0 controlling the amount of liquid refrigerant which is admitted to the syrup rail evaporator. f

While the form of embodiment of the invention as hereindisclosed, constitutes a preferred form, it is to be understood that otherforms might be adopted, all comingwithin the sco of the claims which follow.-

What is claimed is as follows:

1. Refrigerating apparatus comprising in combination a refrigerant circulating device, a pair of refrigerating elements connected in series between the outlet and inlet of the circulatin device, and means between the elements or cooling refrigerant issuing from the first element.

2. Refrigerating apparatus comprising in combination a condensing element, a pair of evaporators connected in series between the evaporator.

4. Refrigerating apparatus comprising in combinatlon a condensing element, apair of evaporators connected in series between the out of the gaseous refrigerant 'issuing from the first evaporator, and a third evaporator for evaporating refrigerant from the condenser.

5. The method of, refrigerating which consists in circulatin volatile refrigerant through a pair evaporating said refrigerant in the first evaporator, condensing some or all ofsaid evaporated refrigerant and evaporating said condensed refrigerant in the second evaporator.

6. The method of refrigerating which consists in circulating volatile refrigerant through a pair of evaporators in series, evaporating said refrigerant in the first evaporator, condensiifgrsome or all of said evaporated refrigerant at a pressure no greater than the evaporating pressure and evaporating said condensed refrigerant in the second evaporator.

7. Refrigerating a paratus comprising in o evaporators in series,

et and inlet of the condensing element, a condenser for" condensing at least a portion combination a air 0 evaporators connected I in series, a con ensing element for su plying liquid refrigerant to and with rawin gaseous refrigerant from the series, a thir evaporator connected in arallel circuit rela-,

a condensing con-- in the first element, and evaporatin t a con densed refrigerant in the second e ement of 'the series.

ting

1 9. Refrigerating apparatus-comprising in combination, a pair of e'vaporators, a conduit connecting the evaporators in series, and a third evaporator connected in parallel circuit relation with the series, the conduit being thermally associated with the "third evaporator.

10. Refrigerating apparatus comprisin in combination a pair of evaporators, acon uit connecting the evaporators in series, a container for a non-freezing liquid, and a third evaporator in the container and connected in parallel circuit relation with the series, said conduit passing through said container. 7 11. Refrigerating apparatus comprising in combination a relatively high temperatur= compartment, a relatively low temperature compartment and a compartment to be maintained at an intermediate temperature, means for refrigerating all. such compartmentsin- 'clu'ding an evaporator in the intermediate temperature compartment and an evaporator in the low temperature compartment connected in parallel circuit relation with the first mentioned evaporator, a third evaporator in the high temperature compartment connected in series with the first mentioned evaporator, and means associated with the low. temperature evaporator forcondensing gaseous refrigerant passing from the intermediate temperature evaporator to the high temperature evaporator.

12. A soda fountain comprising in'combination an ice cream compartment, a compartment for circulating water, a compartment for storing syrup and means for refrigerating said compartments including a refrigerant circulating device, an evaporator associated with each compartment, the water compartment evaporator and the syrup compartment evaporator being connected in series with each other and in parallel circuit relation with the ice cream compartment evaporator, and means for condensing gaseous refrigerant issuing from the water com- L said brine tank conne'ctin partment evaporator before such refrigerant enters the syrup compartment evaporator.

13. Apparatus defined in; claim 12 wherein the condensingmeans is a conduit thermally consists'in maintaining a constant supply of liquid refrigerant at low pressure in heat exchan e relation with a compartment to be coole evaporating the refrigerant in response to the refri crating demand of said compartment, with rawing all of said evaporated refrigerant, condensing some or all of said evaporated refrigerant at the evaporating pressure, and evaporating said condensed refrigerant'in thermal association with a second compartment to be cooled.

16, Refrigerating a paratus comprising -1n combination a re rigerating chamber,

ating chamber at the evaporatinglpressure before said refrigerant passes to t e second refrigerating chamber.

' 17. Refrigerating apparatus comprising in combination a pair of evaporators connected in series, a condensing element for supplying liquid refrigerant to and withdrawing gaseous refrigerant from the series,

a third evaporator connected in parallel circuit relation with the series and-a condensing conduit between the evaporators of the series thermally associated with the third evaporator, said apparatusincluding a trap for liquid refrigerant between the series and the condensing element.

a In testimony whereof I hereto ailix my signature. r

DAVID E. MACCABEE.

associated with the ice cream compartment evaporator. r

14. A soda fountain comprisingin combination an ice cream compartment including a brine tank, a compartment for. circulating means for refrigerating said compartments including an evaporator associated with each compartment, and a conduitpassing through the water compartment evaporator-and t e syrup compart- 1 water, a compartment for storing syrup, and

ment evaporatorin series with each other,

the ice cream compartment evaporator being connected in parallel circuit relation wlth said series.

-15.' The method of refrigerating which

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