US2215991A - Refrigeration apparatus - Google Patents

Description

Sept. 2 19 w. B. ANDERSON ET AL 2,215,991

REFRIGERATION APPARATUS Filed April 8, 1959 2 SheetsSheet l INVENTOR GEORGE E.- HANNER 5,

WM. 5. ANDERSON- ATTORNZ FIG- 2.

% ESS'ESI Sept. 24, 1940. w ANDERSON AL 2,215,991

REFRIGERATION APPARATUS Filed April 8, 1959 2 Sheets-Sheet 2 WT E INVENTOR GEORGE E. HANNER 6 WM. 5- ANDERSOM ATTOR EY Patented Sept. 24, 1940 UNITED STATES PATENT OFFICE REFRIGERATION APPARATUS I of Pennsylvania Application April 8, 1939, Serial No. 266,768

3 Claims. (01. 62-115) 7 the U-shaped, cooling fins 21. The portions 34 This invention relates to refrigerating apparatus and more especially to a refrigerant compressing and condensing apparatus arranged in a unitary structure.

One object of the invention is to provide a refrigerant compressing and condensing unit which is economical to construct and assemble.

Another objectis to provide a unitary assembly of a motor-compressor housing, a condenser, and a fan, which assembly provides superior cooling facilities for the condenser and the housing.

These and other objects are effected by our invention as will be apparent from the following description and claims taken in connection with the accompanying drawings forming a part of this application, in which:

Fig. 1 is a plan view of the refrigerant compressing and condensing unit of this invention;

Fig, 2 is an elevation of the unit with parts broken away;

Fig. 3 is a section on the line IIIIII of Fig. 1 with a motor casing in elevation;

Fig. 4 is a section on the line IV IV of Fig. 1; and,

Fig. 5 is a plan view of the shroud members in the same relative position as shown in Fig. 1.

Referring now to the drawings fora detailed description of the invention, the reference numeral l represents a generally cup-shaped sheet metal casing having a portion H of reduced diameter into which a motor I2 is pressed. The motor l2 comprises a motor frame |3, a field winding 4 on the frame l3, a shaft bearing I in the frame l3, a crankshaft l6 journaled therein, and a rotor secured on the crankshaft IS. A reciprocating compressor i3 is secured to the frame l3 by means ofia tongue and groove connection I9 and by further means not shown in the drawings. The compressor l8 comprises 9. cylinder 2|, a piston 22 therein, a valve chamber 23, a connecting rod 24 secured to a pin 25 on the crankshaft I5 for reciprocating the piston 22, and an oil scoop 26 at the base of the connecting rod 24. The cup-shapedcasing |0,is closed by a cover 20, so that the casing comprises a hermetically-sealed container for the motor l2 and the compressor I8. The reduced portion H of the casing ll) which houses the motor I2 is provided with U-shaped sheet metal cooling fins 21 comprising legs, the extremities 29 of which are bent outwardly to lie flatly against the casing l0.

and are welded thereto. v

A shroud 3| comprising two formed sheet metal members 32 and 33 (best shown in Fig. 5) is secured at one end to the central bent portion of of the shroud members 32 and 33 which contact the fins 21 are bulged outwardly to fit closely over the central bent portion of the cooling fins 21. The shroud members 32 and 33 are secured to the cooling fins 21 preferably by spot welding shown at 35. The other ends of the two shroud members 32 and 33 are formed into two parallel and spaced apart surfaces 36 between which a condenser 3'|is secured. The condenser 31 comprises parallel and spaced apart strips of metal 38 through which a refrigerant conduit 39 is passed back and forth. The parallel surface portions 36 of the shroud 3| are slotted to fit over the projecting loops 4| of the refrigerating conduit 39. Each of the parallel surface portions 36 is also provided with an outwardly turnedfiange 42.

Thetwo shroud members 32 and 33 are formed to provide an opening 29 at the top of the unit through which a fan 43, a motor 44, and a portion of a hanger 45 which supports the motor 44 may be inserted. The motor 44 is secured to the hanger 45 by tap screws 46 and the hanger 45 is secured at the edges of the opening 29 by tap screws 4'! after the fan 43, motor 44, and a portion of the hanger 45 are inserted through the opening 29. The portion of the opening 29 adjacent the condenser 31 is closed by a cover plate 48 which is secured to the shroud members by means of tap screws 49. A similar plate 5|.is secured between the shroud members 32 and 33 at the bottom of the shroud 3|. 1 The plates insure that all of the air circulated by the fan is drawn througlithe condenser 31.

The refrigerant conduit 39 of the condenser 31 is connected with the valve chamber 23 of the compressor l8 through a tube 52 which passes through the wall of the casing l0 and is brazed therein to form a leakproof joint. A further tube 53 is brazed into the walls of the casing H) and communicates with the interior thereof. The valve chamber 23 of the compressor I8 is also provided with a short downwardly turned tube 54- which communicates with the interior of the valve chamber 23 and the interior of the casing H).

In the operation of the unit, the refrigerant vapor enters the container ||I through the tube 53 and'passes from there through the tube 54 into the valve chamber 23, is compressed in the cylinder 2| and forced through the tube 52 to the condenser 31 wherein it is liquefied and thereafter passes through an outlet tube 55 to the refrigerating apparatus (not shown). V

A protective device 55 is secured on the outside of the casing l0 adjacent to the motor I2 by forcing its edges beneath the specially formed extremities 5'! of two adjacent fins 21. This protective device 56 is prov ded with a thermostatic element (not shown), which interrupts the electric current conducting path to the motor l2 when the casing I0 exceeds a predetermined temperature in a manner well understood in the art. This protective device 56 is inserted in the electrical circuit of the motor I! to interrupt the current supply thereof, when the temperature of the motor l2 becomes dangerously" high such as may occur through a break-down in the apparatus.

The enlarged portion of the container H) which houses the compressor I8 is provided with two formed brackets 6| at its base which extend in opposite directions. Each of these brackets 61, at its extremity, is provided with a rubber mounting 62 which supports this portion of the apparatus. A yoke 63 ,is secured to the outwardly turned fianges42 of the shroud members 32 and and a similar rubber mounting 54 is secured at the center portion of the yoke 63. The rubber mountings 62 and 64 provide a mounting for the unit and are described in greater detail in the application of Elliott E. Grover, Serial No. 250,192, filed January 10, 1939, and assigned to the assignee of the present application.

It will be observed that the heat of the motor [2 is readily conducted through the thin walls of the casing l0 then across the contacting surface 28 of the cooling fins 21 to the fins 21 themselves. A portion of the heat of the fins 21 is also conducted across the contacting surface 34 of the shroud 3| to the remainder of the shroud 3|. The fan 43 draws the cooling air through the condenser 31 and then passes it through the shoud 3| to the fins 2'|,and to the casing l0 thereby cooling the condenser 3'! and absorbing the heat of the motor [2 by sweeping across the surfaces of the casing III, the fins 21 and the interior surfacepf the shroud 3I.-

It will be apparent that this invention provides a unit which includes the condenser, the

compressor, the motor for driving the compressor, the cooling fan, and a shroud which guides the air of the cooling fan, absorbs heat from the motor and unites the elements in a structure which may be supported at its ends from vibration mountings without the use of intermediate supporting structure. The construction of the unit also facilitates the assemblyof the fan and or as are specifically set forth in the appended claims.

What we claim is:

1. In refrigerant liquefying apparatus, the combination of a compressor, a motor for driving the same, a metal casing enclosing said motor and compressor, a portion of said casing being in intimate heat exchange relationship with said motor, U-shaped metal cooling fins on said casing, the legs of said U-shaped fins being bent outwardly at their extremity to be welded flatly against said casing, a shroud secured to and formed to lie flatly against the fins for an appreciable distance, a condenser spaced from said casing, said means for securing shroud to said condenser to unite the condenser and thecasing into an integral structure, an air circulating fan in said shroud between the condenser and the casing, and a motor for driving said fan, said shroud having an opening for insertion of said fan motor and fan, said shroud directing the air of said fan through the condenser and over the cooling fins.

2. In. refrigerant liquefying apparatus, the combination of a compressor, a motor for driving the same,'a casing enclosing said motor and compressor, cooling fins on said casing, a shroud secured to said fins, a condenser spaced from said casing and secured to said shroud, a'motor and fan assembly between said condenser and said casing, said fan circulating air through said condenser and over said fins, said shroud having an opening for inserting said motor and fan assembly, and a hanger secured to the motor of said assembly and detachably secured to said shroud adjacent said opening, said assembly and hanger being removable from said" shroud without disconnecting either said casing or said condenser therefrom.

3. In refrigerant liquefying apparatus, the combination of a compressor, a motor for driving the same, a metal casing enclosing said motor and compressor, a portion of said casing being in intimate heat exchange relationship with said motor, U-shaped cooling fins on said casing, the legs of said U-shaped fins being bent outwardly at their extremity and welded flatly against said portion of the casing, a shroud secured to and formed to lie flatly against the fins for an appreciable distance, a condenser spaced from said casing, said means for securing shroud to said condenser to unite the condenser and the easing into an integral structure, an air circulating fan in said shroud between the condenser and the casing, a motor for driving said fan, said shroud having an opening for insertion of said motor and fan, and a cover'plate for at least a portion of said opening, said shroud directing the air of said fan through the condenser and over the cooling fins.

WILLIAM B. ANDERSON. GEORGE E. HANNER.

CERTIFICATE OF CORRECTION. Patent No. 2,21 ,991. September 21;, 191w.

' WILLIAM B. ANDERSON, ET AL It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: PageZ, sec- 0nd column, lines 15 and A9, claims 1 and 5 respectively, strike out the word "said" before "means" and insert the same after "securing" in same lines; and that the said Letters Pntent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of October, A. D. 191m.

Henry Van Arsdale,

(Seal Acting Commissioner of Patents.

. CERTIFICATE OF CORRECTION. Patent No. 2,21 ,991. September at, 191m.

' WILLIAM B. ANDERSON, ET A It; is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page Z, sec.- ond column, lines 15 and 11.9, claims 1 and 5 respectively, strike out the word "said" before "means" and insert the same after "securing" in same lines; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of October, A. D. 19M).

Henry Van Arsdale,

(Seal Acting Commissioner of Patents.

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