US2175914A - Refrigerating apparatus - Google Patents

Description

Oct 1%), 19339.

L. A. PHILIPP 2,175,914

REFRIGERATING APPARATUS Filed Aug. 25, 1938 2 Sheets-Sheet 1 A}; V au- INVENTOR. Lamw'm: fl. PHIL/PP BY W W ATTOR NEY.

L. A. PHILIPP 2,175,914

REFRIGERATING APPARATUS Oct. 10, 1939.

Filed Aug. 25, 1938 2 Sheets-Sheet 2 INVENTOR. Lawlemcz H. PmuPP ATTORNEY.

Patented Oct. 10, 1939 UNITED STATES PATENT OFFICE REFRIGERATING APPARATUS Lawrence A. Philipn, Detroit, Mich, assignor to Nash-Kelvinator Corporation, Detroit, Mich", a corporation of Maryland Application August 25, 1938, Serial No. 226,814

Claims." .(Cl. 62-115) The invention consists in providing a suitable condenser substantially enclosing the side walls of a sealed casing, so that at least three side walls of the sealed casing are enclosed by the condenser, and providing a fan with a shroud which is attached to the free ends of the condenser. Upon the operation of the fan air will be drawn through the condenser causing the air to absorb the heat emanating from the walls of the sealed casing and thereby cooling the motorcompressor unit.

The invention further consists in providing a jacket, preferably, composed of a coil of tubing, having thermal contact with the sealed casing thereof. Connected to the ends ofthe tubing is a secondary condenser disposed above the coil of tubing and over the top of the sealed casing. The jacket or tubing is charged with a quantity of any suitable fluid capable of absorbing heat in such a system, for example, sulphur dioxide, or other refrigerant agents, and even water may be employed. The liquid refrigerant in the tubing or jacket upon boiling, due to the extraction of heat from the sealed casing, will pass into the secondary condenser in the form of vapor, where it will condense and return to the tubing or jacket.

The invention consists of certain novel features of construction and combinations of parts which will be hereinafter described and set forth in the appended claims.

, In the accompanying drawings:

Figure 1 is a view partly in elevation and partly in vertical section illustrating the invention;

Figure 2 is a top plan view with the secondary condenser removed;

Figure 3 is a plan view of the secondary condenser; and

by entirely encircling the side wall or walls shell l0, andan annular ring 20 engages the lower end of the motor I! and a' cover or button plate 2| for supporting the motor l1 and compressor l8 as a unit within the shell. The bottom or cover plate 2| is attached to the flange ll of the shell by bolts 22-22 for closing the shell l0 and for hermetically sealing the motor-compressor unit within the shell Ill.

The vaporized refrigerant is returned from an evaporator l2 of a refrigerating system to the shell l0, by a conduit 23 connected by a suitable coupling 24 to the cover 2|. The refrigerant then passes through another conduit 25 into the interior of the shell Ill. The refrigerant in shell I0 passes through compressor intake conduit 26, which has its inlet end in open communication with conduit 25, and this vaporized refrigerant is compressed by the compressor Id. The compressed refrigerant is conducted from the compressor by conduits 21 and 28 to a condenser 29. The conduits 21 and 28 are connected by a suitable coupling 30 carried by thecover 2| for conducting the refrigerant from the compressor I8 to the condenser 29. The refrigerant vapor will be condensed in the condenser 29, and the liquid refrigerant will be conducted by a conduit 3| to a suitable receiver and float mechanism l3 before being delivered to the evaporator l2 by means of a conduit 32 which connects the receiver with theevaporator.

The condenser 29, as shown in Figures 1 and 2 is preferably made in three sections, or of a construction to encompass, at least, three sides or walls of the casing l0 containing the motor-compressor unit. Two of the sections 33, 34 are connected to the intermediate section 35 by suitable couplings 36-36. The refrigerantdelivered from the compressor, is conducted to the condenser section 33 by the conduit 28 which is connected thereto by a coupling 31.

The refrigerant vapor on entering the condenser section 33 will flow therefrom into condenser section 35 and then into condenser section 34 from where it will be discharged through conduit 3| to-the high side float chamber or receiver |3 the refrigerant being condensed during its passage through said sections. Each of the condenser sections 29 is composed of sinuous tubes 38 which are rigidly secured between end plates 39-39. The tubes 38 of the condenser sections are provided with suitable fins 40 forming heat dissipating surfaces.

A shroud 4| is connected to the free ends of the condenser sections 33 and 34 and extends across the remaining or fourth side of the sealed casing l0, so that the three condenser sections 33, 34 and 35 and the shroud 4i encircle the sealed casing l0. The shroud is provided with a tubular opening 42 in which is disposed a fan 44 conected to a motor 45, driven from -a suitable source of power.

Encircling the casing it, of the compressormotor unit, is a coil of tubing 46 which is charged with a quantity of fluid capable of absorbing heat. Any suitable refrigerant fluid may be employed, such as sulphur dioxide or even water. The ends 41-41 of the coiled tubing are connected to the headers 48-48 of a secondary condenser 50 disposed across the top of the sealed casing Ill preferably at a slight angle, so that one of the headers 4'! will be at a higher elevation thanthe other. The condenser 50, may be of any preferred construction, but as illustrated. consists of headers 48-48 having a series of tubes 5l--5l interposed therebetween and connected to the headers for the circulation of the cooling agent. The tubes 5| are provided with fins 52 for dissipating the heat.

The refrigerant or cooling agent contained in the coiled tubing 48 will circulate and be caused to boil within the tubing as the heat is extracted from the sealed casing Ill and motor-compressor units l 1-48, and the vapors emanating from the cooling medium will enter the condenser 50 through one of the tubes 41, where the vapors will condense'and the condensed liquid will return through the other tube 41 from the condenser to the coiled tube ;46 for further circulation and cooling. The coiled tube 48 and condenser II therefore act as a heat exchanger for the sealed casing ll of the motor-compressor unit in extracting the heat generated 'during the operation of the unit.

The several units or sections of the condenser 29 encompassing three sides of the sealed casing l0, and the fan 44 and shroud 4| at one end thereof, provide an enclosure, so that as the fan 44 is driven, air is drawn through the several condenser sections 33, 34 and I5 aroimd the walls or sides of the sealed casing, and at the same time air is being drawn through the secondary condenser 50 positioned within the area of the condenser 29 and over the top of the sealed casing. Therefore, heat is being extracted from the condensers 29 and 5| and from the top and side walls of the sealed casing ll, at the same time by the suction created by the fan 44 in drawing the air over the sealed casing. Furthermore, the sealed casing is being additionally cooled by the cooling medium of the coiled tubing 40. In this manner heat is being dissipated from the motor-compressor unit and its sealed casing by a compact arrangement of the several condensers, and making it possible to employ such a system in the machine compartment of a domestic refrigerator cabinet. I

In Figure 4 is disclosed a condenser which may be employed in lieu of that shown in Figures 1 and 2. This condenser is constructed of a bank of sinuous tubing BI, and adapted to enclose three join the intermediate portion. Pins 51 are prosaid sealed casing and connected to the combe readily accomplished by inserting the condensing unit in the machine compartment of a household refrigerator and providing a flue for inducing a flow of natural air convection currents over the condensing unit and through the 5 flue. In this case it may be desirable to extend the condenser around all four sides of the motor compressor unit instead of only three sides. In this case the four sided condenser may be spaced laterally and vertically from the bottomof the 1 dome so that air may pass upwardly through the condenser and about the dome. A refrigerator cabinet utilizing a flue construction suitable for use in connection with the condensing unit disclosed herein is as disclosed in Patent No. 1,673, 1 082 to Alfred S. Lewis, patented June 12, 1928.

By providing coils 46 which surround the motor compressor unit a very emcient heat removal arrangement is provided. Coils 48 may be rigidly secured to the compressor dome by fusion, such as welding or soldering. By utilizing the secondary condenser for cooling the compressor, effective cooling takes placeand the secondary condenser does not transmit noises from the motor compressor unit as is the case where large heat transfer flns are secured to the motor-compressor dome to dissipate heat from the dome.

Although only a preferred form of the invention has been illustrated and that form described in detail, it will be apparent to those skilled in 3 the art that various modifications may be made therein without departing from the spirit of the invention or from the scope of the appended claims.

What I claim is: 3

1. Refrigerant apparatus, comprising a sealed casing housing a motor-compressor unit, a condenser for receiving a refrigerant fluid discharged from said compressor, means for containing a cooling fluid associated with said casing in heat exchange relation therewith, and a condenser connected to said means and overlying said casing for radiating the heat absorbed therey.

2. Refrigerant apparatus, comprising a sealed casing housing a motor-compressor unit, a condenser substantially enclosing the side walls of said sealed casing and connected to the compressor for receiving compressed refrigerant therefrom, means for containing a cooling fluid associated with said casing in heat exchange relation therewith, a condenser connected to said means and overlying said casing for radiating the heat absorbed thereby, and means for drawing air through said condensers and over the walls of said casing for extracting the heat therefrom.

3. Refrigerant apparatus, comprising a sealed; casing housing a motor-compressor unit, a condenser substantially enclosing the side walls of pressor for receiving compressed refrigerant therefrom, means for containing a cooling fluid associated with said casing in heat exchange relation therewith, a condenser connected to said means and overlying said casing for radiating the heat absorbed thereby, a shroud arranged at a side of said casing and connected to said first mentioned condenser for forming an enclosure for said casing, said shroud'having an opening therein, and a power driven fan positioned adjacent said shroud opening for drawing air through said condensers and over the walls and top of said casing for extracting the heat therefrom.

4. Refrigerating apparatus, comprising a scaled casing housing a motor-compressor unit;

annour a condenser encom three sides of said sealed casing and for receiving compressed reirigerant from said compresso a shroud arranged at the remaining side of said casing and connected to the condenser for forming an enclosure-for said casing, said shroud having an opening therein, and a power driven faii' positioned with respect to the opening of the shroud for drawing air through said condenser and shroud and over the sides of said casing Ior extracting the heat thereof;

5. Refrigerating apparatus, comprising a casing housing a motor-compressor unit, means for containing a cooling fluid associated with said casing in heat exchange relation therewith, a condenser connected to said means and overly n at least part of said casing for radiating the heat absorbed thereby, and a condenser for receiving fluid discharged from the compressor and positioned along the side wall of said casing.

mwnmcn a, PmuPP.

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