US3147914A

US3147914A - Compressor

Info

Publication number: US3147914A
Application number: US182869A
Authority: US
Inventors: Bernard W Hatten; Benjamin E Solomon
Original assignee: Westinghouse Electric Corp
Current assignee: CBS Corp
Priority date: 1962-03-27
Filing date: 1962-03-27
Publication date: 1964-09-08
Anticipated expiration: 1981-09-08
Also published as: ES282561A1

Description

p 8, 1964 B. w. HATTEN ETAL 3,147,914

COMPRESSOR Fild March 27, 1962 a 0 Mo non I Ill/l Il/N Berpdrcj W. Hcflen 8 United States Patent 3,147,914 COMPRESSOR Bernard W. Hatten and Beniarnin E. Solomon, Columbus, Ohio, assignors to Westinghouse Electric Corporatlon, East Pittsburgh, Pa., a corporation of Pennsylvania Filed Mar. 27, 1962, Ser. No. 182,369 6 Claims. (Cl. 230-232) This invention relates to the reduction of noise in motor-compressor units, for example, hermetically sealed motor-compressor units for use in home refrigerators, freezers, air conditioners, and the like.

It has heretofore been recognized that the body of oil present in the lower portion of the shell of such motorcompressor units provides a solid path for transmission to the shell of noise originating in the compressor and that this solid path could be broken up to a considerable and worthwhile extent by generating bubbles in the oil body with consequent reduction in the amount of noise transmitted through the oil to the lower portion of the shell. The bubbles also provide increased absorption (or damping) of pressure pulsation in the gas above the oil body, thus reducing the excitation of the upper portion of the shell.

One previously used method of bubbling the oil was to discharge suction gas into the body of oil through a perforated tube whose perforations were below the surface of the oil body. Another such method was to disturb the oil by means of a screen kicker extending downward from the connecting rod. This kicker also provided lubrication, and was distinguished by the interrupted action as it entered the oil during only a portion of each piston cycle.

The present invention provides a less expensive and more satisfactory means for producing bubbles in the body of oil and involves the disposition of the motor rotor relative to the body of oil such that a portion of the rotor, or of structure carried by the rotor, is partially submerged in the oil body. Consequently, when the motor is running, the submerged portion of the rotor, or of the structure carried thereby, continuously churns and aerates or gasifies the oil, producing a high degree of bubbling or foaming of the oil, thus materially reducing the sound transmitting ability of the body of oil.

In one form of the invention the lower end ring portion of the rotor conductors is the partially submerged structure. In another form of the invention the end ring portion of the rotor conductors is above the surface of the body of oil, but carries downwardly extending lugs which are partially submerged in the oil. In yet another, and preferred, form of the invention an oil stirrer of disclike shape is secured on the rotor shaft just above the surface of the body of oil and has one or more peripheral fingers or blades or other stirring members perforated or otherwise suitable for producing bubbles extending downwardly into the oil to agitate and foam the latter whenever the motor is running.

An object of the present invention is to reduce the transmission of noise from a hermetically-sealed motor-compressor unit to its sealing shell via a body of oil bridging the space between the unit and its shell.

Another object of the invention is to continuously mechanically agitate the body of oil in a hermetically-sealed motor-compressor unit while the unit is running.

Yet another object of the invention is to continuously stir a body of oil in a motor-compressor unit.

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

FIG. 1 is a vertical sectional view of a motor-compressor unit incorporating oil-stirring means constructed in accordance with the present invention;

FIG. 2 is a fragmentary vertical sectional view of a motor-compressor unit utilizing a modified oil-stirring means of the invention;

FIG. 3 is a view similar to FIG. 2, showing yet another embodiment of the invention, and

FIG. 4 is a perspective view of the stirrer of FIG. 3.

As shown in FIG. 1 of the drawing, the invention is utilized in a hermetic refrigeration compressor, or motorcompressor unit, comprising a two-part shell or case 10 having upper and lower sections 11 and 12, respectively, of sheet metal or light material which are secured together as by brazing, welding or other suitable means to provide a hermetically sealed joint.

The shell it houses a compressor 13 and electric motor 14 for driving the compressor 13. A frame 16 is provided for supporting the compressor and motor in predetermined operative relationship and includes a portion 17 receiving the compressor cylinder 18 and also including a motorsupporting portion 19 having an upper half 21 which mates with a lower half 22 to engage and support the motor 14. The

frame halves

21 and 22 may be retained in assembled relation by any suitable means, for example, by a flange 20 on the lower half which telescopically receives the lower edge of the upper half 21.

A plurality of screws 23 extend through the motor stator 24 to secure the latter to the lower half 22 of the frame portion 19. A spider 25 is formed integral with the frame lower half 22 and has a central portion 26 which provides a combined journal and thrust bearing for the lower end of a vertically disposed motor shaft 27 to which is fixedly secured the rotor 28 of the electric motor 14. The upper end of the shaft 27 is journaled in a bearing 29 carried by the upper half 21 of the frame portion 19.

The shaft 27 includes an upwardly extending crank arm 31 disposed eccentrically with respect to the longitudinal axis of the shaft 27, this crank arm 31 carrying the free end of a connecting rod 32 through which reciprocatory motion is imparted to a compressor piston 33 disposed in the compressor cylinder 18.

The entire frame 16 and the motor and compressor units supported thereby are in turn supported resiliently from the shell 10 by lugs 34 integral with the frame 16 and resting upon springs 35 which in turn rest upon lugs or brackets 36 provided on the inner side walls of the shell 10.

It will be seen that the shell 10 contains a body 38 of lubricant, as is customary in such hermetically sealed motor-compressor units, for lubrication of the rotating and reciprocating motor and compressor parts in a manner well known and hence not described herein.

It will be noted that in this illustrated arrangement the compressor 13 is mounted above the electric motor 14 with the result that the motor may be so disposed with respect to the body 38 of lubricant in the bottom of the shell that the lower end of the rotor end ring 39 extends below the surface of the body of lubricant. Consequently, during running of the motor the submerged part of the rotor end ring 39 agitates the body of lubricant and generates large quantities of bubbles therein to provide the required sound deadening effect.

Referring now to the construction illustrated in FIG. 2, the general arrangement of the motor and compressor is identical to that shown and described in connection with FIG. 1 except that the lower end of the rotor end ring 39 is disposed slightly above the surface of the body 38 of lubricant and that the agitation of the lubricant to produce the desired mass of bubbles is effected by the provision of one or more lugs or fingers 41 extending downwardly from the lower end ring into and below the surface of the lubricant.

The modification of FIGS. 3 and 4 differs from the arrangements previously described in connection with FIGS. 1 and 2 in that a stirrer 43, preferably formed as a sheet metal stamping, is mounted on the lower portion of the motor shaft 27 below the rotor but above the combined thrust and journal bearing 26. This stirrer is provided with a collar 44 which closely engages the shaft 27 with a press fit so that the stirrer rotates with the shaft. The

stirrer is also provided with one or more fingers 45 which project or extend downwardly into the body 38 of lubricant to agitate the latter during operation of the motor, with the result that large quantities of bubbles are continuously generated during motor operation to pro vide the desired sound deadening effect.

While the fingers 4.5 have been herein illustrated as lying in a circle coaxial with the longitudinal axis of the shaft 27, it will be apparent that the fingers may be turned slightly out of the circle to give them a working angle or pitch to provide greater stirring or agitating action and obviously this angle may be uniform for all of the fingers or may vary from finger to finger both in direction and in degree. Also the cross section of each blade may be either flat or curved.

While the invention has been shown in several forms, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications without departing from the spirit thereof.

What is claimed is:

1. In refrigeration apparatus,

a gas-containing shell,

a motor-compressor unit mounted within said shell in spaced relation to the latter,

a body ofoil within said shell,

said motor-compressor unit including a motor rotor rotatable about a vertical axis, and a motor stator extending into the body of oil for transfer of heat from the motor to the oil,

a motor-compressor shaft mounted within said rotor,

the lower end of said rotor being disposed in said body of oil, whereby during rotation the oil is foamed thereby reducing sound transmission therethrough from the motor-compressor unit to the shell.

2. In refrigeration apparatus,

a gasscontaining shell,

a motor-compressor unit resiliently mounted within said shell in spaced relation to the latter,

a bodyjof oil within said shell, said motor-compressor unit including amotor stator extending into the body 7 of oil for transfer of heat from the motor to the oil,

a motor rotor rotatable about a vertical axis,

a shaft mounted within. said rotor, and

a lug depending from the rotor into the body of oil for agitating the oil to produce foaming of the latrter, thereby reducing the transmission of sound therethr-ough from the motor-compressor unit to the she 1.

3. In refrigeration apparatus,

a gas-containing shell,

a body of oil within said shell, said motor-compressor unit including a motor stator extending into the body of oil for transfer of heat from the motor to the oil,

a motor rotor core rotatable about a vertical axis and spaced from the body of oil,

a compressor shaft mounted in said rotor core, and

a lug depending from said rotor core into said body of oil for agitating the latter to produce foaming thereof, thereby reducing transmission of sound therethrough from the motor-compressor unit to the shell.

4-. In refrigeration apparatus,

a gas-containing shell,

a body of oil in said shell,

a motor-compressor unit mounted within said shell in spaced relation to the latter with the motor of said unit disposed below the compressor thereof, said motor having a stator extending into the body of oil for transfer of heat from the motor to the oil,

a rotor, a shaft mounted in said rotor and rotatable about a vertical axis, and said rotor including a member extending downwardly into said body of oil for agitating the latter to produce foaming thereof, whereby transmission of sound therethrough from the motor-compressor unit to the shell is reduced.

5. In refrigeration apparatus,

a gas-containing shell,

2. body of oil in said shell,

a motor-compressor unit resiliently mounted within said shell in spaced relation to the latter with the motor of said unit disposed below the compressor thereof, said motor having a stator extending into the body of oil for transfer of heat from the motor to the oil,

a rotor,

a shaft mounted in said rotor and rotatable about a vertical axis, said rotor having a lug projecting downwardly therefrom into said body of oil for agitating the latter to produce foaming thereof, thereby reducing transmission of sound from the motor-compressor unit to the shell via the body of oil.

6. In refrigeration apparatus,

a gas-containing shell,

a body of oil insaid shell,

a motor-compressor unit resiliently mounted within said shell in spaced relation to the latter with the motor of said'unit disposed below the compressor thereof, said motor including a stator extending into the body of oil for transfer of heat from the motor to the oil,

a shaft rotatable about a vertical axis, and

a stirrer secured to the lower terminal portion of said shaft and rotatable therewith, said stirrer including a plurality of lugs extending into said body of oil for agitating the latter to effect foaming thereof, said lugs lying in planes generally tangential to a circle concentric with the axis of rotation of said shaft.

References Cited in the file of this patent UNITED STATES PATENTS 2,199,415 Philipp May 7, 1940 2,990,111 Bohn June 27, 1961 2,996,240 Stocklein et al. Aug. 15, 1961

Claims

1. IN REFRIGERATION APPARATUS, A GAS-CONTAINING SHELL, A MOTOR-COMPRESSOR UNIT MOUNTED WITHIN SAID SHELL IN SPACED RELATION TO THE LATTER, A BODY OF OIL WITHIN SAID SHELL, SAID MOTOR-COMPRESSOR UNIT INCLUDING A MOTOR ROTOR ROTATABLE ABOUT A VERTICAL AXIS, AND A MOTOR STATOR EXTENDING INTO THE BODY OF OIL FOR TRANSFER OF HEAT FROM THE MOTOR TO THE OIL, A MOTOR-COMPRESSOR SHAFT MOUNTED WITHIN SAID ROTOR, THE LOWER END OF SAID ROTOR BEING DISPOSED IN SAID BODY OF OIL, WHEREBY DURING ROTATION THE OIL IS FOAMED THEREBY REDUCING SOUND TRANSMISSION THERETHROUGH FROM THE MOTOR-COMPRESSOR UNIT TO THE SHELL.