US2415011A - Motor compressor assembly - Google Patents

Description

Jan. 2s, 1947. E. F. HUBACKER 2,415,011

uoTon couPREssoR AssmLY Filed Se'pl..^ 18, 1942 2 Sheets-Shao?. 1

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Jw- 28, 1 947- E. F. HUBACKER UOTOR COPRESSOR ASSEMBLY Find-sept. 1a, 1942 2 Sheets-Shut 2 .l

. frff'acef JZMW d@ Patented `ian. 28, 1.947

MOTOR COMPRESSOR ASSEMBLY Earl F. Hubacker, Highland llark. Mich., as-

signor to Borg-Warner Corporation, Chicagm, Ill., a corporation of Illinois I Application September 18, 1942, Serial No. 453,891

This invention relates to motor compressor units and particularly to an improved arrange,- ment having special application as a refrigerant compressor. i I

It is a general object to provide an improved arrangement oi elements forming a sealed housing compressor assembly having the minimum overall coaxial dimension while maintaining a high efficiency of operation and effecting a reduction in the cost of manufacture over that of similar units of present manufacture.`

It is an object to accomplish the above by a special arrangement of unloading valve structure operable in response to a predetermined speed of rotation to -thus lower the required starting torque of the motor compressor unit and consequently make it possible to efiectan economy in the weight and material requiredin the construction of the unit.

It is a more detailed object to -provide in a motor compressor unit of the above type an improved lubricating arrangement for insuring the delivery of the necessary lubricant to eachoi the vital moving parts. Y

It is another particular object to provide in a motor compressor unit oi the above type a special arrangement of bearings which will effect an improved distribution of bearing load and hence reduce the required capacity of the individual bearing.

It wis still another object to provide an arrangement for taking advantage of the reaction effect of the discharge gases and further reducing the power requirements of the motor with a consequent reduction in cost and increase in efciency.

Another detailed object is the provision of the above-described compact arrangement of elements making it possible to employ identical dome stampings comprising the sealed housing thus eliminating the extra cost involved in 'Droviding twi` different shapes and sizes of stampings as well as making it possible to reduce the overall height of the refrigerator cabinet and compressor assembly forming the complete refrigerator unit.

Other and more particular objects, advantages and uses of my invention will become apparent from a reading of the following specification taken in connection with the accompanying drawings forming a part thereof and wherein- Fig. l is a coaxial cross-section view of a compact motor compressor unit forming a preferred embodiment of my invention and bringing out to particular advantage the location of the com- 2 pressor withinthe axialconiines of the motor rotor andstator windings;

Fig. 2 is a broken-away cross-section view taken substantially on the line 2-2 of Fig. 1

. and bringing out to advantagetheparticular relation of the rotating compressor cylinder, the embraced eccentric about which the cylinder rotates and particularly the centrifugally responsive divider unloading valve structure;

Fig. 3 is a broken-away cross-section view o! the structure including and associated with the centrifugally responsive divider unloading blade and showing the blade in the unloading position; y Fig. 4 is an elevation view taken substantially on theline 4`l oi Fig. 2 with certain of the structure broken away bringing out to particular advantage the operation of the compressor discharge valve asy well as the passage in the rotating compressor cylinder for conveying the compressed refrigerant to thedome of the compressor.

Referring in'greater detail to the iigures of the drawings, I0 indicates generally a refrigerant motor compressor unit including a pair of identical dome stampings `II and I2 formed ci sheet metal and requiring but a single set of dies. as by welding at I3. Received Within the dome members Il and I2 is a motor and compressor supporting bowl-like frame indicated generally at I4 which may be a casting and which is given a pressed fit Within the dome members.` Frame member Il includes side portions I6 embraceably receiving the stator laminations I1 of the motor and windings Ila carried thereby, said frame further including a coaxially extending shaft I8 supporting the combination motor rotor and compressor indicated generally at 2I for rotation there-about as will appear.

This combination motor rotor and compressor unit 2I in its construction and arrangement forms a particular part of the present invention.

A rotatable annular ring 22 is formed therein with a compressor cylinder 23. Mounted on the external periphery of ring 22, as by means of a pressed fit, are a plurality of motor rotor laminations24 having the function of cooperating with the stationary field laminations and windings and effecting the rotation of the annular ring 22. The inner periphery 23 of this rotatable ring or the compressor cylinder embraces a ring 25 which in turn rotates about an eccentric 26 formed on the vertical supporting shaft I8, this eccentrically mounted ring 25 being further arranged for engagement by the blade of a spe- These stampings may be fastened together:

l plates sz and sa in the. cylinder 23.

body 1I) in engagement Awith the valve seat formed therein against which it is urged by means of a spring 1I.

For' the purpose of effecting `the necessary lubrication of the critical parts a sleeve 12 is pressed about a depending rim 13 extending from lower closure plate 3| `downwardly about shaft I8 to a point slightly below the normal oil level within frame member I4. Since the pressure within the frame I4 above the liquid levelf14 is always greater than that existing within the cylinder 23 on the lower pressure side of said cylinder, the oil will be forced up between sleeve 12 .and shaft I8, between `the bearing 32 and shaft I8, between the eccentric 26 and ring 25 and'between the ends of the roller 25 and Cylinder end Also the oil :will be forced up between the shaft I and bearing 34 between the upper revolving' seal bearing between bearing plate 3B and the upper end of the shaft I8 into the suction passage.

' The other usual necessary elements required to produce an operative compressor assembly will, of course, be employed but Yneed, not be described here in further detail than to mention that the same include the connection E2 `for delivering the compressed refrigerant to the conto move said blade-like portion into engagement with said compressor means upon rotation of said Aannular compressor ring at a predetermined speed, a plurality of motor rotor defining laminations embracingly received about" the external periphery of said annular rotatable compressor ring and fixed thereto cooperating with said field windings 4foreiiecting rotation of said annular compressor ring, and means for delivering refrigerant to .be compressed to said cylindrical chamber on one side of said divider" blade-like portion and means on the other side of said divider blade-like portion for discharging the compressed. refrigerant from `said cylindrical chamber into saldenclosing housing.`

2. In a motor compressor unit, `means defining a sealably `enclosing housing, a motor and compressor assembly mounting frame supportably carried within said enclosing housing and comprising a surrounding wall portion having a pressed fitwithin saidv housing, motor stator -l animations and fieid windings mounted within said wall portion for xed support thereby, said duit (not shown) leading to the condenser, the

connection ISB forthe conduit leading fromthe evaporator to the check valve assembly 51', -as well as the electrical connection indicated generally at 64 leading to the motor windings.

While I have described my invention in connection with a specific embodiment thereof, it is to be understood thatthls is by way of example rather than by way of limitation and' that the same -is to be defined4 by the' appendedclaims which should be given a scope commensurate with the prior art.

I claim: i

l. In a motor compressor-unit including means defining a sealed enclosing housing, a motor and compressor assembly supportably carried within said enclosing housing, said assembly comprising motor stator laminations and field windings, means' forming a non-rotatable shaft extending upwardly in axial relation within said eld laminations and windings, means defining a compressor body and motor rotor combination for rotation on said shaftl Ain axial relation to each other within said field laminations and windings, said last named means comprising an annular rotatable ring formed therein with a cylindrical compressor chamber, means adjacent the axial extremities'of said cylindrical compressor chamber defining bearings for rotatably mounting said compressor body and rotor on said shaft, compressor means eccentric to said shaft and jour naled thereon between said bearings Within said cylindrical compressor chamber, means defining a divider blade assembly carried within said annular rotatable ring, said last named means including a blade-like portion arcuately adjustable into and out of engagement with the outer periphery of said compressor means, spring means urging said blade-like portion in a direction away from engagement. with said compressor means with a predetermined torque, a pocket in the portion of said divider blade opposite said bladelike portion for receiving material having higher specific gravity than the material of said divider blade. for effecting predetermined weightv distribution of said divider blade assembly, centrifugally responsive means including said pocket and said higher specific gravity material effective frame means having a non-rotatable shaft extending therefrom upwardly inV axial relation within said field laminations andwindings,` means.'

defining a compressor body and motorzcombination for rotation on said shaft within said field laminationsand windings, said means comprising 'an annularrotatable ring member formed therein with a` cylindrical compressor'chamber, means closing the opposite extremities of said compressor chamber and having bearings therein for rotatably mounting said annular ring member on said shaft, cylinder defining means eceentrically arranged on said shaftwithin said compressor chamber between the extremities thereof, means defining a. divider blade assembly rotatably carried on the inner periphery of said rotatable compressor ring, said means including a blade-like portion arcuately adjustable into and out of engagement with the outer periphery of said eccentric cylinder defining means, spring means urging said blade-like portion in adirection away from engagement with said eccentric cylinder defining means with a predetermined torque, a pocket in the portion of said divider blade opposite said blade-like portion for receiving material having higher specific gravity than the material of said divider blade for effecting predetermined weight distribution of said divider blade assembly, centrifugally-responsive means including said higher specific -gravity material effective to move said blade-like portion in opposition to the urge of said spring meansv into engagementA with said eccentric cylinder .upon the rotation of said cylindrical ring at a predetermined speed, a plurality of motor rotor `defining laminations embracingly received about the external periphery of said rotatable compressor ring and fixed thereto for cooperation with said field windings for'effecting rotation of said rotatable compressor ring, and means for delivering refrigerant to said cylindrical chamber on one side of said divider blade-like portion and means on the other side of said divider bladelike portion for discharging the compressed refrigerant from said cylindrical chamber into said enclosing housing.

3. `In a` motor compressor unit, including means defining a sealed enclosing housing, a motor and compressor assembly supportably carried within said enclosing housing, said compressor comprising an annular rotatable ring formed therein with a cylindrical compressing 7 chamber, means dening a. cylindrical member eccentrically arranged within said compressing chamber, means defining a divider blade assembly including a blade-like portion, means supporting said blade-like assembly on said annular rotatable ring for arcuate movement of said blade-like portion into and out of engagement with the outer periphery of said eccentrically disposed member fory dividing said chamber into a high pressure zone and a low pressure zone, spring means urging said blade-like portion in a direction away from engagement with the periphery of said eccentrically arranged cylindrical member with a predetermined torque, said blade assembly further including a pocket having therein a material of higher speciiic gravity than the material defining the divider blade assembly to provide centrifugally-responsive means eiective to move said blade-like portion into engagement with said eccentricallyarranged cylindrical member in opposition to the action of said chamber, means carried by said shaft dening a cylindrical member eccentrically arranged within said compressor chamber, means closing the terminal portions of said annular ring including bearings supporting said ring for rotation on said shaft, means defining a divider blade assembly carried by said annular rotatable ring, said divider blade assembly including a bladelike portion arcuately adjustable into and out of engagement with the outer periphery of said eccentrically disposed cylindrical member for dividing said compressor chamber into a high pressure zone and a low pressure zone, spring means urging said blade-like portion in a direction away from engagement with the periphery of said eccentrically arranged cylindrical member with a predetermined torque, said divider spring upon the rotation voi' said annular ring.

ata predetermined speed,and means for deliver- "ing refrigerant to said compressor to be compressed and means for delivering compressed refrigerant therefrom.

4. In' .a motorv compressor unit including meansI deiining a' sealed enclosing sheet metal housing, a -motor and compressor assembly supportably carried within said enclosing housing said-assembly comprising a bowl-like rigid frame the radial outer periphery of said frame being press fitted within said housing, a supporting shaft carried by said frame and extending in non-rotatable coaxial relation thereto, said compressor comprising an annular rotatable ring formed therein with a cylindrical compressor blade assembly including a pocket having therein a material of higher specific gravity than the material defining the divider blade assembly to provide centrifugally-responsive means eil'ective to move said blade-like portion into engagement with said eccentrically arranged cylindrical member upon the rotation of said annular ring at a predetermined speed, said motor comprising a plurality of metal laminations embracingly received about periphery of said annular ring and xed thereto, a second plurality of metal laminations surrounding said first-named laminations in radially spaced relation thereto and pressl iitted within said frame, motor windings associated with said laminations for producing the rotation of said annular ring, and means for introducing low pressure fluid to said low pressure zone and means for removing compressed iiuid from said high pressure zone.

EARL F. HUBACKER..-

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