US2001540A - Evaporator for refrigerating systems - Google Patents

Description

May 14, 1935. D. F. NEWMAN 2,001,540

EVAPORATOR FOR REFRIGERATINQ SYSTEMS Filed July 1, 1933 Fig 1.

- Inventor: Delbert F Newm n,

g I Hi Mam-IQ.

Patented May 14, 1935 UNITED STATES PATENT OFFICE Delbert F. Newman,

to General Electric Company,

EVAPORATOR FOR SYS arrnrceaarmo TEMS New York Schenectady, N. Y., assignor a corporation of Application July 1, 1933, Serial No. 678,628

3 Claims.

My invention relates to evaporators for refrigerating systems.

Evaporators for commonly provided with space 6 ing freezing trays refrigerating systems are for accommodatwherein water or desserts may be frozen. It is often desirable to provide a refrigerated shelf within this compartment in order that additional placed therein.

freezing trays may be tion will become apparent as the following description proceeds, and the features of novelty which characterize my invention will be pointed out with particularity in the claims annexed to and forming a part of this specification.

For 'a better understanding of my invention reference may be had to the accompanying drawing in which Fig. l is an elevation partly in section of a refrigerating machine provided with a cooling unit embodying my is a detail perspective view,

invention, and Fig. 2 partly in section, of

the cooling unit shown in Fig. 1.

Referring to Fig. 1, l. have shown a refrigerating machine including a compressor and condenser unit comprising a and a condenser Ii mounted on compressor casing Ill a removable top l2 of a refrigerating cabinet l3. Within the cabinet and suspended from evaporator i4 embodying my machine gaseous refrigerant the top I2 is an invention. In this is compressed by a motor-driven compressor within the casing l0 and passes into the condenser H where it is liquefied and flows to a flow-control device l5 from which it passes in through a conduit I 6 to H of the evaporator.

the flooded type and comprises 9. depending shaped portion i8 having regulated quantities a conduit within a shelf The evaporator I4 is of headers l9 and 20 formed at the upper ends thereof and connected by a tube 2|. The shelf l'l walls 22 of the is secured to the side depending portion l8. Liquid refrigerant passing through the conduit within the shelf i1 flows up conduit 23,

to the header I9 through a and refrigerant vaporized by the absorption of heat within the conduit in the shelf is forced out to the header l liquid refrigerant. The U 9 with the flow of the -shaped portion is is filled with liquid refrigerant, which partially fills the headers i9 and 20a in the header 20.

20 to the level indicated at Upon absorbing heat, the

liquid refrigerant vaporizes and the vaporized conduit 28 communicates with the header is at refrigerant is withdrawn from the evaporator ll by a conduit 24 connecting the header is and the intake of the compressor within the casing ill.

The construction of the evaporator I4 is clearly shown in Fig. 2, which is a perspective view from the rear of the evaporator. The U-shaped portion l8 and the headers I9 and 20 are formed of inner and outer shells 25 and 26 respectively, having horizontal indentations forming the headers i9 and 20. The shell 28 is provided with indentations or corrugations 21 at right angles to the headers and forming refrigerant-circulating passages communicating with the headers at opposite ends of the passages. The edges of the shells 25 and 26 are secured together by folding the edge of the shell 25 over the edge of the shell 26 and by welding or otherwise sealing the joint formed, and the corrugations in the shell 26 are also joined by the shell 25 to resist internal pressure. The shelf I! in the embodiment illustrated comprises a sinuous conduit 28 about which is cast a body of metal 29 of high thermal con-- ductivity such as aluminum. Lugs 30 are provided at the sides of the shelf l1 for securing it by screws 3| to the depending walls 22; The

the rear of the coolingunit through the conduit 23, which is a continuation of conduit 28. At the other side of the shelf, the conduit 22 is connected to the conduit I6 through which refrigerant isjadmitted there In the operation of the refrigerating system shown, refrigerant is compressed in the casing ll, liquefied in the condenser H, and admitted to the conduit IS in regulated quantities by the flow control device l5. Liquid refrigerant passes from the conduit I6 to the conduit 22 and abs'prbs heat from the shelf and articles resting thereon. Any gas which is formed during this absorption of heat will be forced out with the flow of liquid and will not remain to form an insulating layer, which would reduce the heat-absorbing capacity of the evaporator shelf. Refrigerant after 565N113 through the shelf I'I' will flow upward t rough the conduit 23 to the header IS. The level of liquid refrigerant in the cooling unit is maintained in both of the headers i9 and 20 about as shown at 20a. in Fig. 2. 'e indentations of the'U- shaped portion iii are thus maintained filled with liquid refrigerant, and any gas formed by the absorption of heat from the chamber to be cooled or from freezing trays placed on the bottom of the U-shaped portion 18 will rise to the headers intake port of the-compressor within the casing iii. The tube 2| is provided to permit ready passage of gaseous refrigerant between the headers l9 and 20 and thus equalize the pressures therein so as to facilitate the circulation of liquid refrigerant in the evaporator.

An evaporator constructed in accordance with my invention is highly eflicient, as has been pointed out, since gaseous refrigerant carmot remain in the shelf to reduce the absorption of heat by the shelf. The manufacture of the evaporator described herein is simple since the main body of the evaporator may be constructed of sheet metal, and the shelf easily attached thereto.

Although I have shown and described my invention in connection with a compression refrigcrating machine, it will be apparent that it is applicable to other uses, and I do not desire my invention to be limited to the particular construction shown and described, and I intend in the appended claims to cover all modifications within the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

l. A refrigerating system including a flooded evaporator having a header and a depending refrigerant-circulating portion, a cast metal shelf secured to said depending portion and having a refrigerant conduit embedded therein, means for circulating liquid refrigerant through said conduit and for then supplying said liquid refrigerant to said evaporator, and means for withdrawing gaseous refrigerant from said header.

2. A cooling unit for refrigerating machines including an evaporator comprising a U-shaped refrigerant-circulating portion and a header at each end of said portion, means for providing communication between said headers, a shelf secured between the sides of said U-shaped portion, a refrigerant conduit connected to said shelf in heat exchange relation therewith, means for admitting refrigerant to said conduit, means providing communication between said conduit and said evaporator, and means for withdrawing refrigerant from one of said headers.

3. A cooling unit for refrigerating machines including an evaporator comprising a U-shaped refrigerant-circulating portion and a header at each end of said portion, means for providing communication between said headers, a shelf secured between the sides of said U-shaped portion, a sinuous conduit embedded in said shelf, means for admitting refrigerant to said conduit, means providing communication between said conduit and said evaporator, and means for withdrawing refrigerant from one of said headers.

DELBERT F. NEWMAN.

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