US2672736A - Compressor cooling in refrigerating apparatus - Google Patents

Description

March 23, 1954 A. PHILIPF COMPRESSOR COOLING IN REFRIGERATING APPARATUS Filed Aug. 31 1950 INVENTOR. Amvemw/Q s wpp Patented Mar. 23, 1954 UNITED STATES PATENT OFFICE 2,672,736" coMPREssoR COOLING INREFRIGERATING Lawrence. A, Philipp,

Nash-Kelvinator C Detroit, Mich., assignor torporation netroit, Michal a corporation. of Maryland Applicafimr Ali'g'list li l, 1950 SeriaI No'Z 1823608 3 Claims.. (Cl. 62-1174) 'I'hisinvention relates to refrigerating appara tusra-nd more particularly to dissipating heatfrom said apparatus during'the operation thereof;

ant motor-compressor unit.

Another object of my invention is to pl'OVidGi'fol: a refrigerating system installed in a refrigerator cabinet,

motor-compressor unitof a refrigerating system by placing a plurality of L-shaped secondary refrigerating systems-inspa-ced apart relation about thecasing of the motor-compressor unitso as to dissipate the; heat from: the motor compresson unit-into the ambient air about said uniti- Furtherv objects and: advantages. of. the present invention. will be apparent from; the following-- olescription reference being had to the accompany-- ingf drawings, wherein a; present invention is; clearly shown In the drawings:

Fig..lisa schematic illustration of a refrigerating' system embo ying features of my invention; Figi 2-is a'top'vie'w'ofa motbr com'pressor unit shown in Fig rangement" for motor-compressor unit; and:

Fig.= 3 is a? diagrammatic illustration of? a cabinet with the' system disclosed Fig. 1 installed in: said cabinet.

Referringto designates; in

the drawings; the numeral? general, a refrigerating" system which includes a motor-compressor unit 2 2; condenserf 24 and evaporator 26: The motor-compressor unit 22 includes a casing 30 which houses tacting relationship with the casing 30. The comside is connected to preferredform of the During operation ofthe motor compressor unit; gaseous refrigerant is Withdrawn from the evap orator 25 through the vapor return conduit 45 where'it enters the compressor and is compr'es'sed and discharged into conduit' dfl," which conducts the compressed refrigerant to the condenser 24;

ithe'condenser and tensive-use.

During operation of the motor-compressor unit there is considerableheat' generated within: the casingdueto the mechanical and frictionallosses of the compressor and due to' electrical losses of the" electric motor'3z'.

In many instances: it is" desirable to provide: means fordissip'ating heat from the motor-compres'sor unit so: as'to prolongthelife of th'emotor windings and; the compressor; In this connec-- tion',-. I have provideda pluralityof secondary-re frigerating systems 50 and,- as shown, four of preferably brazed to the Preferably; thesesystems: are L-shaped and arranged" inverted fashion with"; the vertical por tion 54-.ofthe libeing securedr to the casing-arid the: horizontal leg- 56' extending outwardly away from the casing: Fins; 58 are secured to each hori'zontallleg to aid in' dissipating heat from: the tubing. As noted iniFi'g; 2, theup-pe'r partof the casing is smaller than the lower'part thereof and the upper part" is eccentrically positioned witfi respecttbthelower partrthereof; It will' be noted portion of the casing.

During operation, when the aforesaid" heatis generated within the casing and must be" dissiof the secondary refrigerating systems where the the tubing with the aid of the heat transfer surfaces provided by the fins 58. This arrangement materially afiects the cooling of the upper portion of the casing so as to prevent over-heating and reduced life of motor windings and also conducts heat away from the interior of the casing and away from the compresor unit proper.

In addition to the above characteristics of my invention, it will be noted that the secondary systems are secured to and carried by the motorcompressor unit without the aid of additional means, so that same may be readily removed with the compressor and originally shipped for installation along with the compressor.

This particular arrangement of dissipating the heat from the motor-compressor unit is also advantageous when installed in the cabinet 60 of the type disclosed in Fig. 3, which cabinet may be the same as that disclosed and described in my Patent No. 2,485,066, issued October 18, 1949. This cabinet includes a food storage compartment 62 and a sloping rear wall section 64. Th sloping rear Wall section 84 provides a machinery compartment 66 at the rear of said wall in which the motor-compressor unit 2.2 is located. At the rear of the machinery compartment 66 is placed the condenser 24, which is carried by a sheet of metal member 68, which may be like the sheet metal member disclosed in the aforesaid patent, to sup port the condenser and motor-compressor unit, as disclosed and described in said patent.

With the installation of the motor-compressor unit in the angularly shaped machinery compartment, it will be noted that the sloping or angular wall 64, together with the sheet'rnetal member 68, provides an upwardly inclined. flue so that air may enter the bottom opening of the machinery compartment 66 and pass over the motorcompressor unit and condenser, thereby causing the heat to flow through said flue. In accordance with the present invention, the secondary refrigerating system dissipates heat from the motor-compressor unit from various sides of the motor-compressor unit into the angularly formed machinery compartment or upwardly inclined flue, so as to create and induce the upward flow of air through the flue and over the motoroornpress-or unit and about the condenser.

From the foregoing it will be noted that I have provided a new and improved arrangement for dissipating heat from a motor-compressor unit. Also, it will be noted that I have utilized this characteristic for increasing the flow of heat throug the flue of the cabinet in which the motor-compressor unit is installed. It will also i be noted that I have provided this improved arrangement by the use of independent secondary refrigerating systems which are secured to and entirely carried by the motor-compressor unit.

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 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.

I claim:

1. In refrigerating apparatus, a cabinet-having a cooling compartment and a machinery compartment, a wall member spaced from a wall of said cabinet in overlying relationship to said machinery compartment forming therewith an upwardly tapering fiue to induce flow of heat away from said machinery compartment, a refrigerant evaporator arranged to absorb heat from said cooling compartment, a refrigerant motor-compressor unit in said machinery compartment operatively connected to said evaporator, a refrigerant condenser operatively connected to the motor-compressor unit and to said evaporator, and a secondary refrigerating system having a portion in thermal heat conducting relationship with said motor-compressor unit and a portion extending outwardly therefrom into said flue and terminating therein below the apex of said tapering flue to aid in inducing the flow of air through said flue and about said condenser and motorcompressor unit.

2. In refrigerating apparatus, a cabinet having a cooling compartment and a machinery compartment, a wall member spaced from a wall of said cabinet in overlying relationship to said machinery compartment forming therewith an upwardly extending flue to induce flow of heat away from said machinery compartment, a refrigerant evaporator arranged to absorb heat from said cooling compartment, a refrigerant motor-compressor unit in said machinery compartment operatively connected to said evaporator, a refrigerant condenser operatively connected to the motor-compressor unit and to said evaporator, and a secondary refrigerating system having a portion in thermal heat conducting relationship with said motor-compressor unit and a portion extending outwardly therefrom into said flue" and terminating therein below the upper extremity of said machinery compartment to aid in inducing the flow of air through said flue and about said condenser and motor-compressor unit.

3. Refrigerating apparatus comprising, a refrigerant compressor, an electric motor connected to drive said compressor, said motor and compressor generating heat, a casing enclosing said motor and compressor in heat conducting relationship and having a dome, a plurality of inverted L-shaped tubes attached to the dome in heat conducting relationship and each containing a quantity of refrigerant, said inverted L-shaped tubes each having a vertical leg in contact only with said dome and each having a horizontal leg extending a distance less than the diameter of said dome, and means sealing opposite ends of said tubes.

LAWRENCE A. PHILIPP.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,883,921 Hull Oct. 25, 1932 1,922,091 Hull Aug. 15, 1933 2,250,648 Phillip July 29, 1941 2,438,114 Dennedy Mar. 23, 1948 2,445,988 Ayers July 27, 1948 2,484,310 Phillip Oct. 11, 1949 2,561,305 Limpert et al. July 1'7, 1951

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