US1728183A - Refrigerating apparatus - Google Patents

Description

Filed May so, 1928 attomwqi Patented Sept. 17, 1929 UNITED" STATES PATENT OFFICE JESSE G. KING, OF DAYTON, OHIO, ASSIGNOR TO 'FRIGIDAIRE CORPORATION, 01'

DAYTON, OHIO, A. CORPORATION 01! DELAWARE REFRIGERATING APPARATUS Application filed Kay 30,

This invention relates to refrigerating apparatus and more particularly to.an apparatus for installation in what is commonly called an ice cream counter.

6 An object of this invention is to provide" a fitting for adapting a standard evaporator so that it may be used in a system where several temperatures are to be obtained.-

Another object of this inventionv is to pro vide an evaporator or cooling unit with a fitting adapting it to be used with systems for furnishing several different temperatures, for instance, in an ice cream cabinet."

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanylng drawings, wherein a preferred form of embodiment of the present invention is clearly shown.

In the drawings:

Fig. 1 is a view partly in elevation, partly in section and partly diagrammatic of a refrigerating system embodying my invention, and

Fig. 2 is a view-in elevation of one type of standard evaporator adapted to be changed for use in said system.

A refrigerating system embodying features of my invention is generall designated as 20. It may comprise a re gerant liquefying unit which, in this embodiment, may comprise a compressor 21 delivering compressed refrigerant to a condenser 22. The refrigerant condensed inthe condenser 22 is stored in the receiver23 fromwhich it is delivered as required. to an evaporator generally designated as 24. The evaporator 24 is-adapted to feed chilled liquid refrigerant to a body to be cooled, in this case shown as a sirup rail 25, from whence liquid refrigerant is delivered to a second evaporator 26. Refrigerant evaporated in evaporator 26 is returned thru the pipe 27 to the compressor 21, for instance, thru the crankcase. A portion of the refrigerant delivered to the evaporator 24 is evaporated therein, and this evaporated refrigerant leaves the evaporator thru the "pipe '28, fitting 29, valve 30, pipe 31, and automatic valve 32 back to the compressor 21. The valve 32 remainder of the 1928. Serial No. 281,605.

is an automatic valve adapted to maintain a pressure in evaporator 24 somewhat higher than the pressure in evaporator 26. Thus the evaporator 24 is maintained at a higher temperature and may be used to coolthe supplies requiring relatively higher temperatures, such as. the water, while the evaporator 26 may be used for the coldest temperatures required, for instance, to cool the brine for maintaining the ice cream in no a frozen condition.

The evaporation of the refrigerant in evaporator 24 chills the liquid refrigerant in said evaporator. A art. ofthe chilled liquid refrigerant may e taken thru the 06 pipe 33 and thru the branch 34 to the pipe 35 which may be used to cool the sirup in the various containers of the sirup rail 25. The refrigerant thence passes to the inlet '36 of the evaporator 26 provided with a float controlled valve, not shown, in evaporator 26. The difference in pressure maintained between evaporator 24 and the evaporator 26 by means of the valve 32 causes the flow of liquid refrigerant thru the pipe 35. Thus it is .seen that several different temperatures may be maintained in the cabinet, as for in-- stance, the zone cooled by the evaporator 24, the zone cooled by pipe 35 and the zone cooled by the evaporator 26. p Means for rendering the operation of the refrigerant liquefying a paratus automatic may be provided. For t is purpose a motor 39 may drive the compressor 21 thru some medium such as the belt 40. An expansible 86 bellows 41 may be connected to the pipe 27 by means of the pipe 42, The expansible bellows 41 is adapted to operate a snap switch 43 which controls the starting and stopping of the electric motor 39. In.this 00 particular embodiment, the bellows 41 is actuatedby the ressure prevailing in the evaporator 26. Since the evaporator 26 is to be maintained at the lowest pressure, the

system is automatically 96 maintained at its proper pressure because theflow of the refrigerant is in the direction of the lowest pressure, which, in this 3 is in 1 9 evaporator 26 and the return 11116 27,-

' 15 is ada In order that a standard evaporator may be used for making this type ofinstallation the fitting 29 is adapted to be placed in theusual evaporated refrigerant outlet 5 of a standard evaporator: In Fig. 2 is shown a type of standard evaporator which may be changed by my improved fitting in order to adapt it to the system herein described. As shown, this evaporator is similar to evaporator 26. It may be provided with afloat controlled inlet 45 and an evaporated refrigerant outlet needle valve fitting 30. The inlet and the outlet fittings are adapted to be mounted on a, plate 47, which ted to receive the inlet and the outlet fittings in the proper openings. 'In order to adapt this evaporator for the system heretofore described it is only necessary to unscrew the fitting 30 from the plate 47 The fitting 29 may then be placed in the opening left by the fitting 30 and thereafter the regular fitting 30 maybe inserted in the fitting 29. 1

The fitting 29 may be made by providing a lpassage 48 for the evaporated'refrigerant. e .fitting may have a shouldered reduced endfor insertion into the late and a shouldered enlarge}? tpening or receiving the fitting 30. e ttings 29 and 30 may be 30 secured to the. late 47 by means of bolts 30 passing thru th fittings. A branch 49 may be made in'said fitting 29. This branch 49 may have a tube 33 soldered'thereto so that-no evaporated refri erant may pass out 35 of the branch 49. In acing the fitting 29 -on the late 47, the tu e 33 maybe first inserted t u the tube 28' and ma be bent into the position shown inFig. 1 a ter the fitting 29 has'been bolted, in place as herein before 4o described. Thereafter, the plate 47 ma be 3 attached to the evaporator. The end e the tube 33 may be cut at a angle, as shown,

in order to insure that the en of the pipe is not closed by the walls of the evaporator.

'45 The branch 49 may then have the fitting 34, which may be of the needle valve variety, screwed fthereto'to which the pipe 35 may be connected.

While the form of embodiment of the pres.-

50 ent invention as herein disclosed, constitutes a preferred form,'it is to be understood that other vforms might be adopted, all comin -withinthe scope of the claims which fo ow. y

What is claimed is as follows:

1. A coolin unit comprising a float chamber, a re igerant 'inlet, a float contrpl led valve in saidinlet, an em rated refrigerant outlet having its termina above the normal liquid level in said unit, a fitting said outlet provided with a tube extending)below said normal liquid level and with a ranch for delivering liquid refrigerant from said tube.

05 2. A-cooling unit comprising a liquid refri erant chamber, an automaticall contro ed refrigerant inlet in said cham er, an evaporated refrigerant outlet havin its terminal above the normal liquid love in said unit, a fittin in said outlet provided with a tube exten in below said normal liquid level and with a ranch for delivering liquid refrigerant from said tube.

3. A cooling unit comprisin a float chamber, a refrigerant inlet, a oat controlled valve in said inlet, an evaporated refrigerant outlet having its terminal above the normal liquid level in said unit, a fitting in said outlet provided with an extension below said normal liquid level and with a branch for delivering liquid refrigerant from said extension.

4. -A fitting to be placed inthe regulation evaporated refrigerant outlet of an evaporator, said fitting being provided with an extension adapted to extend below the normal liquid refrigerant level in said evaporator andbeing provided with a branch for delivering liquid refrigerant from said extension and with a branch for delivering evaporated refrigerant from said evaporator.

5. 'A plate for making refrigerant conduit connections with an evaporator said plate being provided with a liquid refrigerant, automatically controlled inlet, an evaporated refrigerant outlet and a fitting adapted to be placed in said evaporated refri erant outlet, said fitting being provided with an. extension passing thru said outlet and adapted to extend below the normal liquid level in said evaporator, and-with branches for evaporated refrigerant and chilled liquid refrigerant respectively.

In testimony whereof I hereto afiix' my signature.

' JESSE G. KING.

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