US2735613A

US2735613A - Calling

Info

Publication number: US2735613A
Authority: US
Publication date: 1956-02-21
Anticipated expiration: 1973-02-21

Description

Feb. 21, 1956 J CALUNG REFRIGERATION UNIT 3 Sheets-Sheet Original Filed June 23, 1945 Int/6722 @4 70 Cal [i7 9 PMQ:

Feb. 21, 1956 J, cALLlNG 2,735,613

REFRIGERATION UNIT Feb. 21, 1956 J, AL 2,735,613

REFRIGERATION UNIT Original Filed June 25, 1945 3 Sheets-Sheet 5 \j/27L 661162759 I Q a United States Patent REFRIGERATION UNIT John Calling, Evansville, Ind.

Original application June 23, 1945, Serial No. 601,195. Divided and this application January 22, 1952, Serial No. 267,572

4 Claims. (Cl. 230-2t16) This invention relates to hermetic compressors for refrigerators, but more particularly to the means for mounting motor-compressor units within hermetically sealed metallic housings and for collecting and distributing lubricating oil therewithin.

This application is a division of co-pending U. S. application Serial No. 601,195 filed June 23, 1945, now abandoned, which describes a hermetically-sealed unit wherein the motor-compressor is resiliently mounted within a housing by means similar to that described in the instant application.

Heretofore it has usually been the practice to press fit the motor-compressor unit into the housing, or to space the motor-compressor unit from the housing walls by means of coil springs. Neither of these arrangements, however, has been entirely effective in solving two of the important problems encountered in such units, i. e., that of mounting the motor-compressor unit so that it has very little movement with respect to the housing, and that of providing a mounting wherein the noise due to operation of the compressor valves and the vibration of the motor is not transmitted to the housing and thereby unduly amplified. In the former case, while there is no danger of breaking the suction or liquid lines connected to the remainder of the refrigerating apparatus or of the electrical conductors, because of vibration, the compressor is excessively noisy by virtue of the sounding board effect of the housing. In the case of the coil spring mounting, the movement of the motor-compressor unit is so violent that the refrigerant lines are very often broken. Furthermore, even the coil spring mounting does not effectively reduce the transmission of sound waves to the housing.

In sealed units of this character an additional problem is encountered in providing lubrication to all the moving parts therein. Because of the relative movement of the motor-compressor with respect to the housing, and be cause of the sealed nature of the construction it is not entirely practical to run connections from the inside to the outside for lubrication purposes. As a consequence such units usually are sealed with a small quantity of lubricating oil therein that intermixes with the refrigerant and endeavors to provide a splash type of lubrication for the moving parts thereof. Arrangements of this character, however, have not proven entirely satisfactory because all of the moving parts do not get the complete lubrication they require; hence excessive and unwarranted wear is to be expected in some of the components thereof.

Accordingly, it is the principal object of this invention to provide a hermetically sealed motor-compressor unit of improved design which is relatively quiet in operation and which provides adequate lubrication for all moving parts thereof.

Another object is to provide an improved means for circulating lubricant between various parts of the motorcompressor unit.

A further object is to provide an improved means for collecting and distributing lubricant in a hermeticallysealed motor-compressor unit.

A yet still further object is to provide a novel means for mounting the motor-compressor unit within the housing in spaced relation thereto so as to eliminate the transmission of sound waves from the motor-compressor unit to the housing and at the same time limit to a very slight degree the relative movement of the motor-compressor unit and the housing.

Qther objects and features of the invention will become apparent as the disclosure of a preferred form there of is set forth in the following detailed description and accompanying sheets of drawing, in which:

Fig. 1 is a vertical section through a hermetic compressor embodying the invention;

Fig. 2 is a section taken on the line 2--2 of Fig. 1;

Fig. 3 is a section taken on the line 33 of Fig. 1 with the oil collecting and distributing shield removed;

Fig. 4 is a section taken substantially on the line 4-4 of Fig. 3;

Fig. 5 is a section taken on the line 55 of Fig. 1; and

Fig. 6 is the same type of view as Fig. 5 showing a modified resilient support between the motor frame structure and the casing.

Referring to the drawings in more detail, the compressor is carried by a hermetically sealed housing indicated in its entirety by the reference character 10. Said housing is made up of two casing members 11 and 12. The casing member 11 has a cylindrical portion 13 'of substantial length joined at one end in an eccentric relation to a plate 14 which is circular at its outside edge. Said plate fits against and is welded to a flange 15 formed on a cylindrical portion 16 of the casing member 12. The cylindrical portion 16 is joined to a curved head portion 17 which completes the casing member 12. The cylindrical portion 13 of the casing member 10 is completed by an end portion 18, said portion being concave toward the inside of the casing member. A bracket 19 secured to the end portion 18 of the casing member 11 provides means for connecting the housing to an upstanding bracket 20, the connection being in the form of a block 21 of resilient material and a bolt 22 extending through the bracket 19, the block 21 and the upstanding bracket 20. Opposite the bracket 20, the other end of the housing 10 is supported by upstanding brackets 23. Blocks of resilient material 24 fitted against said bracket also engage brackets 25 extending downwardly from the cylindrical portion 16 of the casing member 12. Bolts 26 extend through the

brackets

23 and 25 and through the blocks 24 of resilient material fitted therebetween. The

brackets

20 and 23 are supported by any suitable base structure as indicated by the reference character 26'. The motor-compressor unit within the housing 10 is supported generally by a unitary frame structure 27. Said frame structure includes a cylindrical motor housing portion 28 extending into the cylindrical portion 13 in spaced relation with respect thereto. Fig. 1 indicates diagrammatically a stationary portion 29 of the motor structure which is rigidly secured to said housing portion 28.

An annular recess 30 is formed around the end of the motor housing portion 28 of the frame structure, said recess forming a seat for circumferentially spaced arcuate blocks 31 as shown in Figs. 1 and 5. A second series of similar blocks 32 are fitted within the cylindrical portion 13 of the casing member 11, circumferentially spaced therein and being alternately located with respect to the blocks 31, whereby the spacing is equal between the

alternate blocks

31 and 32. A resilient band 33, preferably of spring steel or similar material, is mounted midspacers way of the annular space between the cylindrical wall of therecess 30 and the inside cylindrical wall of the overlapping portion of the cylindrical casing portion 13. Said resilient bandis secured by suitable .mean s,-:-Sllhas rivets 34 to the blocks 31 and Iii-whereby the blocksor contact members and the band form a unit-whichmay be handled as such during assembly and disassembly. It will be understood that said construction; gives a firm support for the frame structure 27 while being; capable of-absorbing vibrations which would be transmitted by a rigid assembly to the housing 10.

Fig. 6 shows a modified support for the motor end of the frame structure 27, said modification consisting of a singleundulated band 35 of resilient material such as spring steel stock. Circumferentiallyspaeed arcuate portions 36 engage the inside wall of the cylindrical casing portion 13. Said arcuate p rtions 36are joined byangw larly disposed connecting portions 37 with circumferential arcuate portions 38 which engage the wall of therecess '3 by pr p r selection ofma ri Lan y rr n ing the angular; walls3f7 in predetermined angular relation, this form f th device p o i e an etfective res ie support for the frame structure of the motor-compressor unit.

At'the end of the frame structure 27, remote, from the m t r, n ff et pw d y x e i g po 3 s -1 i vided with a compressor cylinder 4!], A piston 41' rrnonnted in said cylinder is joined by a connecting rod 42-with an eccentric formed on a motor-shaft 44. Said motor shaft; extends through a bearing portion offthe frame structure including an outer sleeve 45 and an axially spaced inner sleeve 46. Said shaft 44 carries the rotating parts of the electric motoras indicated diagrammatically by the reference character 47. The shaft 44 is provided with an integral counterweight 48 to counterbalance the eccentric 43.

The motor shaft 44 is formed with an internal bore 49 extending inwardly from its outer end. The eccentric 43 is formed with a bore 50 connecting with the bore 49 for metering lubricant to a conduit 51, rifle drilled in the connecting rod 42. An orifice 52' connecting with the bore;4 9 is provided to deliver lubricant to an annular recess 53 formed in the frame structure betweenthe bearings45 and 46.

To provide for collecting lubricant and distributing it to the bore 49. for distribution therefrom as set forth, an oil collecting receptacle 54 is provided. S aid receptacle includes an arcuate outer wall SS secured by an upwardly extending member 56 to a portion of the frame structure 27. Said receptacle also includes arcuate end walls 57 and angularly extending troughs 58 formed at the bottom and extending inwardly to a fitting 59 which I is fitted in the bore 49 of the motor shaft 44 and rotates therewith. Said member contacts an inner wall-6 0-which is a part of the trough 58 to provide a substantial lubri: cant type seal; whereby thecollected lubricant will be delivered tothe bore 49. To complete-the oil collecting and distributing system an oil fiinger 61 in the form of a Hat circular disk is secured on the end of the motor shaft 44 for rotation therewith. A substantial portion of the oil coming in contact with said disk is thrown into the arcuate area occupied by the receptacle 55. The

arcuate end walls 57 of said receptacle overlap the edge of the' disk 61 whereby oil discharged from said disk is collected.

The compressor, end of the motor'compresscr unit is resiliently supported in the casing member 16 of the housing as best shown in Fig. 3. Laterally projecting ears or brackets 62 which are formed integrally with the frame structure 27 provide abutting means for upper springs 63 and lower springs 64. .The lower springs are. seated. in cups65 supported by brackets 66 which are rigidly secured by welding to the circular portion 1450f the casing member 11. By securing said brackets to the casing member 11, the casing member 16 may be rethe casing member 16 being slightly spaced a t-its outer edge with respect thereto. Said deflector is provided with right angle securing portions 69 at its' ends, said portions being aperturedand being fitted between the upper surfaces ofthe brackets 66 and the lower surfaces of the cups 65. The spring pressure acts to hold the defiector 69 securely in position on the brackets 66. It will be noted that the deflector 69,- is positioned inv clearance relationship with respect tothe counterweight.

For delivering refrigerant gas to-be compressed to the housing 10, a threadedfitting' 70 is secured toithe circular portion 14 of the casing member. 11. vRefrigerant. gas is delivered through this fitting directly-into the interior of the housing 10. For deliverin compressed. gas :from

thehousing 10 a fitting 71 is secured to the circulanportion 14 of the. casing member-10. Said fitting within the housing is secured to-a conduit 72. Said conduit, as

shown in Fig. 2, extends around the cylindrical portion vides a simple yet effective arrangement for collecting lubricating oil and facilitating the distribution thereof to the moving parts of the motor-compressor within the.

housing, and-which, furthermore, provides a resilient mounting that gives the necessary freedom of movement. for the motor-compressor unit withouttransmitting undue vibration and noise to the housing therefor. The construction is simple vand easy to manufacture and assemble, and as allthe mounting parts including the compressed refrigerant conduit are carried by onemember. of the housing, operation of theunit may be observed without-the other casingmember of the housing unit being. imposition. The scope of the inventionis indicated in .the appended claims.

What-is claimed is:

1. In a refrigerating device having a casing: providing an-oilreservoir' in the lowerportion thereof andaframe structure resiliently mounted'within the casing and supporting a compressor, a shaft rotatably carried;bythe frame in a ho'nzontal position above the. oil. reservoirv in the casing; means for. supplying oil from the; reservoir.

to the, shaft comprising an oil flinger disk carried by the.

shaft. proximate one end .thereof'forrotation therewith:

and of such size as to dip :into the reservoir, a receptacle secured to the frame structure, independently of the: easing; and disposed so as to encircle'substantially thev upper half of the; disk and constructed andarranged to. catch oil flung; against the interior surface thereof by porting. a, compressor, a shaft rotatably carried. -by..the. frame :in a ho'rizontalrposition above the oil reservoir.

in the casing, means for supplying oil from thereservoir to the shaft "comprising an oil flinger'disk; carried by the shaft proximate onc e'nd thereof-for rotation therewith and of such size as to dip into the reservoir, areceptacle disposed so as to encircle substantially the upper half of the disk and constructed and arranged to catch oil flung against the interior surface thereof by the disk, said receptacle being secured to the frame structure independently of the casing and resiliently positioned against an end portion of the shaft whereby oil caught in the receptacle is constrained against leakage back into the reservoir, and means including an inclined trough adjacent the lower portion of the receptacle for directing oil collected therein to the shaft.

3. In a refrigerating device having a casing providing an oil reservoir in the lower section thereof and a frame structure supporting a compressor and being resiliently mounted within the casing, a shaft rotatably carried by the frame in a horizontal position above the oil reservoir in the casing and provided with a bore extending inwardly from an opening in one end thereof, an oil flinger disk carried by the shaft proximate one end thereof for rotation therewith and of such size as to dip into the reservoir, a semicircular receptacle secured to the frame independently of the casing and disposed so as to encircle substantially the upper half of the disk and arranged to trap oil flung against the interior surfaces of the receptacle by the disk, said receptacle being fashioned with an arcuate shaped outer wall the lower portion of which extends below the horizontal plane of the shaft and arcuate end walls extending inwardly from the outer wall and angularly extending troughs at the bottom of the walls wherein oil trapped by the receptacle is collected, and having said troughs sloped toward the bore opening in the shaft whereby oil collected in the receptacle may flow by gravity into said bore in the shaft.

4. In a refrigerating device having a casing providing an oil reservoir in the lower section thereof and a frame structure supporting a compressor and being resiliently mounted within the casing, a shaft rotatably carried by the frame in a horizontal position above the oil reservoir in the casing and provided with a bore extending inwardly from an openng in one end thereof, an oil flinger disk carried by the shaft proximate one end thereof for rotation therewith and of such size as to dip into the reservoir, a semicircular receptacle secured to the frame independently of the casing and concentrically disposed with respect to the shaft so as to trap oil flung thereinto by the disk, said receptacle being fashioned with an arcuate shaped outer wall the lower portion of which extends below the horizontal plane of the shaft and a rear wall spaced from the outer wall and a bottom Wall joining said outer and rear walls and so arranged as to provide an oil collecting canal proximate the lower portion of the receptacle, said rear wall having the upper edge thereof disposed above the horizontal plane of the shaft and provided with an opening therein in axial align ment with said shaft, and oil communicating means including a fitting secured in the open end of the shaft and projecting through the opening in the receptacle rear wall whereby oil collected in the canal of the receptacle is conveyed to the bore of the shaft.

References Cited in the file of this patent UNITED STATES PATENTS 920,421 Boland May 4, 1909 2,008,581 Dennison et a1 July 16, 1935 2,043,215 Smith June 2, 1936 2,298,749 Buschmann Oct. 13, 1942 2,300,973 Rogers Nov. 3, 1942 2,500,751 Halfvarson Mar. 14, 1950