Патент USA US2133875код для вставки
' Oct.f 1s, 1938. c. H.s'rE-Elusj-R'UP4 2,133,875 REFRIGERATING MACHINE Fi1_ed Feb. 17, 1957 l" 94 . ` " : 96 vh‘u/evfcov‘: y Cen-'l H. Steenstr‘up, ' by )Vm/'yé' His f ‘Attorney . Patented Oct. 18, 1938 ` A 2,133,875 « UNITED STATES ~ 2,133,875 Y REFmcEnATmG MAcnnvE Carl H. Steenstrup, Schenectady, N. Y., assignor toGeneral Electric Company, a corporation oi' „ ‘ New York Application February 17, 1937, Serial No. 126,206 5 Claims. (Cl. 2311-232) My invention relates'to compression type re l frigerating machines, and >incre particularly to an improved construction and arrangement of n an intake muilier therefor. ` - Compression type refrigerating machines are frequently provided with a compressor and a driv ing motor enclosed in a casing which'is prefer ably hermetically sealed, thus obviating the ne cessity of using connections with packing glands 10 or the like between the motor land compressor, gaining entrance intovthe intake muiller 'and the ' cylinder ofthe compressor. ' ' » ` Another object of my invention is- to provide ‘ an improved intake muiiier construction for com-' pression type `ïefrigerating machines which em- 5 bodies an arrangement providing for the escape from the intake muiiler of any lubricant accumu lated therein. ' ~ Further «objects and advantages of my inven tion will \become apparent as the following de- 10 and minimizing leakage of refrigerant from the. scription proceeds, and the features of novelty » machine, as any gaseous refrigerant which es which characterize my invention will be pointed _ ' capes from the compressor is confined in the out with particularity in theclaims annexed to enclosing casing. It is desirable that the‘enclos and forming a part of this speciflcation.` _ 15 ing casing be provided with a lubricant reservoir For a better understanding of my invention m for containing a body of lubricant which is re reference may be .had to the accompanying draw- . » circulated to the bearings and moving parts of ing, in which Fig. 1 is a side elevation, partly in~ the motor and compressor during operation of section, of a refrigerating machine embodying the machine without the necessity of variation 20 and replenishment, thus simplifying the main tenance of the machine. In order to minimize the transmission of operating noises of the com my invention; Fig. 2 is a vertical sectional view , or tne'mtake mumer shown in Fig. 1; F1g:3 is a 2° sectional view of the intakemuiiler alongthe line ' ' 3,-3 of Fig. 2; Fig. 4 is a vertical sectional view " pressor through the enclosing casing to a refrig of a modified form of the intake muffler4 shown in . erator cabinet it is desirable 'that an, intake muf Fig. _2; Fig. 5 is a plan view óf the intake muilier 25 fier be associated with the -intake port of the . shown in Fig. 4; and Fig.'6 is a fragmentary side 25. elevational view taken in the direction of the' During the operation of a- refrigerating ma arrow 6 in Fig. 1 of the refrigerating machine. chine of this type it is very important that no Referring to the drawing,A in Fig'. 1 I have. appreciable quantity of Íthe body of lubricant shown a refrigerating machine ofthe household 30 contained in the> lubricant reservoir formed in type provided with a. hermetica'lly rsealed casing the enclosing casing be dr'awn into the cylinder I0 made of an upper casing section II and a of the compressor through the intake muiller, asV lower casing section vI2, the adjacent edges of the presence of lubricant >in the compressor cyl .these casing sections being welded together at inder would give rise to excessive pressures in I3 over-a reinforcing ring I4. `The casing sec- o. B5 the cylinder resulting in damage to the valves tions II and I2 are preferably made of steel and 35 of the compressorylubricant being a non-com -are mounted on a removable cabinet _top I 5. 'A" , pressible fluid. In actual practice, it is diil‘icult to refrigerant compressor I6 and an electric driving prevent lubricant from being drawn into the cyl-- motor I1 therefor are enclosed within `the her- -' inder of the -compressor as the body of lubricant' metically sealed casing Iß. v 'I'he compi-'essorv I6 i0 contained in the lubricant reservoir formed in is secured to the top of the driving -motorv I'I by'40 „ compressor. . , the enclosing casing often becomes `frothy'and a series of bolts I8, thus formingacompact uni » rises considerably above its `normal operating tary structure. This unitary structure is mount- _ n y level in the enclosing casing into the intake zone edin the casing I 0 onthree vertical springs I9,"V of the intake muilier. Furthermore, >during- the i5 assembly >and shipment of -such a refrigerating machine the enclosing casing oftenlbecomes tilt ed from its normally upright. position allowing a portion of the body of lubricant contained .in the 20 and 2|. 'The upper'ends of the springs I9, .20 and 2| are` secured to feetv22, 23 and 2l, respec- 45 tively, these feet being welded to the periphery of the frame ofy the motor I'I- _at equally spaced intervals'. A lubricant reservoir I2a _is formed in ` 1 ' lubricant-reservoir to spill into the intake muilier, -the lower casing section v12 and >contain'zfiïa body i0 from which it is drawn into the cylinder of the of lubricant therein which is recirculated from 50 compressor when the machine is started. -» the lubricant reservoir tó the bearings and mov It is -an object ofmy invention to provide an ~ ing parts of the motor and the compressor-dur improvedarrangement of the intake muiiler in ing operation ‘of the machine. _ .v-Also gaseous re an enclosed compression type refrlg rating ma- `< _ frigerant i5 chine in order to prevent frothy lu riçant from is conñned in the upper portion of-_th‘e enclosing casing Il. ' v . 2 2,188,875 lAs best shown in Fig. 6, the driving motor I1 retracted on lits suction stroke the pressure with- ' has _a substantially vertically disposed shaft 25 i in the cylinder is reduced and gaseous refrigerant which extends above the upper end shield of the is drawn into the cylinder from .the upper portion driving motoí- and reciprocates a compressor pis of the enclosing casing I 0 through the intake t0n 23 in a substantially horizontal cylinder of i muiller 33, the muille box 3| and the intake valve the compressor i3 through a suitable driving of the cylinder. ~When the piston 23 in the com >connection 21. Preferably,.the driving connec - pressor cylinder is moved in the opposite direc tion on its ‘compression stroke the gaseous refrig tion is of the Scotch yoke mechanism type in erant within the cylinder is compressed and dis cluding a crank‘pin 28 and a cross-head 23 slid 10 'ably carried by the end of the piston 23. A coun charged through the exhaust valve of the cylinder terweight 30 is disposed eccentric with respect and the muille box 3| into the exhaust muiller 35. en. 'I'he compressed gaseous refrigerant passes from the exhaust mutller 35 through a conduit 33 _to a condenser 40 which is cooled by natural draft and which surrounds the enclosing casing I0, the con denser having a passage 4|. therein, preferably divided into upper and lower portions which are to the center line of the vertical shaft 25 and counteracts the dynamic unbalancing affect of the crank-pin 23 and the reciprocating piston 23 upon the. u'nitary structure comprising the com pressor I3 and the driving motor _|1, during op eration of the machine. .Intake and exhaust vports are provided in the compressor cylinder in connected in series by a conduit 42. The com pressed gaseous refrigerant is liquefied in the con-4 denser 4|)A and flows therefrom through a conduit 20 43 to a suitable ñow controlling ñoat valve 44. Liquid refrigerant is supplied from the flow con trolling fioat val‘ve 44 through a liquid line 45 to a sheet -metal flooded type evaporator 43.v 'I'he evaporator 43V is supported in the food storage compartment of the refrigerator cabinet by the _heat insulated removable cabinet ,top l5. The liquid refrigerant contained in the evaporator 43 communication with a muflle box 3| secured to 20 the compressor I3 adjacent the outer end of the horizontal cylinder by a series of bolts 32. A cylindrical intake muffler 33 is secured to the lower end of a depending intake conduit 34. the upper end of which is secured to the muille box ‘ 25 3| in communication with the intake. port of the cylinder of the compressor I3. A cylindrical ex haust muiller 35 is secured to the lower end of a depending exhaust conduit 33. the upper end of is vaporized by the absorption o_f heat from arti which is secured to the muille box 3| in com 30 munication with the exhaust port of the cylinder of the compressor I3. A plurality of relatively long restricted tubes 31 havine` return-bend por » tions secured in openings provided inthe intake cles contained in the-food storage compartment in which‘the evaporator is located and the vapor ized refrigerant is collected in a cylindrical header muffler 33 provides communication between the . 41' which _is normally maintained about half full of liquid refrigerant. The vaporized refrigerant upper portion of the enclosing casing I3 and the ` which is accumulated above the level of the liquid 35 refrigerant in the header 41 is returned to the in interior of the intake muiller 33. -' When the refrieerating machine is first started terior of the enclosing casing l0 throughv a suc- l the bndv of lubricant contained in. the lubricant - ~tion conduit 48 which communicates with the reservoir I 2a formed in the enclosing casing I0 'header 41 above the normal liquid level therein. becomes frothy and rises above its normal level inl ` It will be noted that the discharge end 48a of the the enclosing casing due to the reduction of the pressure within the enclosing casing. causing the' gaseous refrigerant absorbed in the body of lubri suction conduit 48 is located above the normal level of the body of lubricant contained in the cant to separate therefrom. Even though .the bodv of .lubricant contained in the lubricant res ing section- I2 of the enclosingicasing I0. The vaporized gaseous refrigerant thus discharged in 45 lubricant reservoir |2a formed in the lower cas- ~ the enclosing; casing I3 is again drawn into the ervoir |2a becomes frothy and rises in the enclos ing casing II! when the machine is started or any intake muii'ier 33 through the tubes 31 communi time during the- operation of the machine‘, it can-` cating with the zone substantially free of frothy not completely ñll the enclosing casing as it will y lubricant in the upper portion of the enclosing be broken up when its upper> level reaches the casingrlil, and the cycle above described is re -50 horizontal plane of movement of the eccentrically peated until the compartment in which the. evap disposed counterweight 30, indicated b_y the‘ broken line 38 in the ùpper portion of the enclos ing casing. 'I'he frothy lubricant coming into 55 contact with the counterweight 33 is thrown out wardly in a radial direction in a thin sheet sub stantially in the plane' indicated by the broken line 38 due to centrifugal force, which further prevents the frothy lubricant in the lower portion 60 of the enclosing casing I3 from rising above this plane. The movement of the counterwei'ght 30 . orator 43 is located is cooled to the desired tem- ._ perature. It will be noted that the upper portion of the enclosing'casing I3, above the level of the body of lubricant in the lubricant reservoir |2a 55 L therein, is normally filled with low pressure gase ous refrigerant. Any gaseous refrigerant which may have been trapped in the body of lubricant while the machine is at rest will be released from this body of lubricant after the machine has run 60 ^ a short time and will _again be mingled with the in the plane substantially normal Ytothe vertical shaft 25 thus suppresses frothing of the lubricant in the upper portion of the enclosing casing and low pressuregaseous refrigerant thereabove. establishes a zone substantially free of frothy and 3, and comprises a series of similar casing lubricant in the upper portion of the enclosing casing above the plane indicated by the broken line 33. The inlet ends of the tubes 31 communi form of the intake-muffler only an upper casing section 33 and a similar lower casing 3| are shown cate with this zone in the upper portion of the 70 enclosing casing II! above the >plane indicated by the broken line 38, thereby positively insuring that no frothy lubricant will be drawn into the intake mumer 33 along with the gaseous'refrigerant dur ing the operation of the machine. - As'the piston 23 in the compressor.. cylinderis Preferably, the intake munler 33 is formed of sheet metal, one formvof which is shown in Figs. 2 ' sections secured together. -In the illustratedl in series, although it will be understood that any desired'number of casing sections may be em 70 ployed kin'seri‘es to obtain the muiliing affect de- ' sired. Each of the casing sections is of cup shaped configuration comprising an end wall, a cylindrical side wall and an outwardly flared open end. The outwardlyñaredeopen‘ eñd 32 of 75 2,183,875 1 the upper casing section 88 receives the end wall then flows from-the lower- chamber 66 through i 63 and ñrmly grips the cylindrical side wall of the >the restricted passage 64 formed in the end wall lower casing section 6|. The_upper and lower 63 of the lower-casing section 6| into the upper casingsection may be soldered or otherwise rig chamber 66 of the muiller casing. 'I‘he gaseous idly secured together. However, I prefer that the refrigerant is then drawn from> the upper ñt between the outwardly flared open end of the _chamber 65 through the depending intake con upper casing section and the cylindrical side wall duit 34 into the muiile box 3| and the intake of of the lower casing section' be sufficiently tight `to r» the compressor I6. Any lubricant gaining en hold the munler casing in assembled relation by trance into-‘the muiiler casing 33 will escape 10 friction. The end wall 63l of the lower casing 6| through Ythe restrl ted aperture 14 provided in l0 constitutes a transverse partition in the mumer the plate 61 and Vdrained back into the lubri ' casing and is provided witha restricted passage _64 therein affording communication between up per and lower chambers 65 and 66, respectively, 15 in the muiiier casing.’ A plate 61 is rigidly se cured in _the outwardly flared open end 68 of the lower casing section 6I by _brazing- or the-like. Thefend of the return-’bend portion of each o‘f the tubes 31 is secured by brazing in openings 63 pro vided in the plate 61. e lower end of the de pending intake conduit 341 secured by brazing in cant reservoir |2a. . _ In an intake mumer vsuch as I have illustrated in Figs. 2 and 3, designed for use in conjunction with a sulphur dioxide refrigerant compressor, 15 d two tubes 31 should be employed to conduct _ gaseous refrigerant into the muiller casing 33. Each of the tubes should have a return-,bend por tion and an overall length approximately 50 times the internal diameter thereof so that an 20 extended reverse-flow muiiling path of restricted a restricted passage 10 'formed in the end 'wall 1| cross-section is formed between the inlet and of the upper casing section 60. The intake con òutlet'ends of the tube. The columns of gaseous duit 34 has an external diameter such that it ` refrigerant in these tubes have a sufliciently high may be. snugly received in either of the restricted inertia that the energy of the wave motion set up 25 passages 10 or 64 in the upper or lower casing' in the gaseous refrigerant within the depending ^ _ section 60 or 6I, respectively, so that when che intake conduit 34 and the chambers 65 and 66 'intake'mufiler is assembled any _of a large number in the muiiler casing is substantially all dissipated of similarly formed casini lsections may be placed in moving such columns of gaseous refrigerant. in any order'in the series. Preferably, each of The volume of the muliierchambers 65Vand 66 30 the tubes 31 is provided with an inlet end or open should be relatively‘large as compared to that. ing 12 disposed at a relatively sharp angle with of- the tubes 31, both the internal diameter ‘and " »- respect to the axis of the extended portion of the héightof each of the chambers being of the the tube invorder to minimize the whistling noises _. order of 9 times the internal diameter of the produced by the entrance of the gaseous refriger tubes 31. Also, the' volume of the muffler casing ant into the tube. Also, the endof the return should be somewhat larger than the volumetric bend portion of each Vof the tubes 31 received in displacement of the piston in the cylinder of the opening 63 formed in the plate 61 is provided the compressor in order to provide a reserve sup with an outlet end ory opening 13. disposed ata ply> of .gaseous refrigerant in the munier casing relatively sharp angle with respect to the axis of ' thereby lminimizing the surges _of gaseous re» 40 the return-bend portion of the tube >in order toV frigerantw into the compressor on the 4suction further minimize the whistling noises produced 'stroke and the accompanying vibratory ' dis by the gaseous refrigerant emerging from the tube-into the lower chamber 66 in the muiiier casing. ~.' . ‘ _ ~ » ' A restricted aperture 14 is provided _in the plate 61 which añords communication between turbances. ' - ~ _ In Figs. 4 and 5 I have shown a modified form of the intake muffler 33 comprising comple mentary upper and lower casing sections 80 and 8|, respectively, _of substantially cup-shaped con the lower chamber- 66 lin the muilier casing and ' ñguration. The upper casing section 80 is pro the interiorof the enclosing casing lilto provide ' vided with an outwardly‘flared open end-82 and for the escape from the lower chamber 66 of any, _' the lower casing section 8|v is provided with an lubricant accumulating therein, and to allow this inwardly flared open end 83, the inwardly flared 50 e lubricant to be drained back into thelubricant open end -83 being received and ñrmly gripped reservoirA I2a formed in the lower casing section within the outwardly flared open end 82. vThese »è I2. The area of the restricted aperture 14 is casing sections may be brazed or otherwise _rigid 55 small asïcompared to theareaof the tubes’31'in -ly secured together. However, I prefer that the order to insure that- the pressure drop through `the restricted aperture 14 is relatively great as. compared to the pressure drop through the tubes 3l. This arrangement insures that substantially no gaseous refrigerant will be> drawn into the lower chamber 66 of the mui'iler casing-„through ‘the restrictive aperture .14, yet lubricant ac cumulating therein will be permitted to escape. The arrangement and construction of the iit between the outwardly flared` op'en end’82 and the inwardly flared open end 83 be suiilciently sa tight to hold the muiller casing in assembled re--_ ‘lation by -friction. A transverse partition. 84 is arranged in the upper casing section’80 in abut 00 ting relationship with the inwardly flared open end 83 of the lower casing section 8i. The par tition 84 is provided with a restricted passage 85 therein forming communicating upper and lower chambers 86 and_81 in the muiller casing. The - intake muffler as above described is described >and claimed in my copending application, Serial ‘ end wall 88 of the upper casing section 88 is pro No. 161,075, ñled August 26, 1937, which is a vided with twg spaced apart openings 83 in I division of the present case. vertical alignment with two spaced apart open- ` Í During the operation of the refrigerating ma-A ings 90 providedy in the transverse .partition 84 chine gaseous refrigerant is drawn into the lower through which two relatively long restricted ‘"jchamber 66 of the `intake mufller 33 from the tubes 3| are inserted in‘to the muffler casing.' 70 zone'substantially free of frothy lubricant in the Each of the tubes 9| extends through the endv _ upper portion of the enclosing casing I8 -through wall 88 _of the upper casing section 88, the upper ' the relatively long restricted tubes 31 having chamber 86, and the transverse partition 84,_into return-bend portions. The gaseous refrigerant the lower chamber 81. 'The tubesßI/are of suf l 4.. 2,138,875 iicient length so as to communicate _with the. serves as a baille for the gaseous refrigerant zone substantially free of frothy lubricant in the upper portion of the enclosing casing Ill, when the intake muilier illustrated in Figs.v 4 and 5 is employed in the refrigerating machine. Pref emerging from the tubes to reverse the direction of flow thereof. The columns of gaseous re frigerant in these tubes have a sufficiently high inertia that the energy of the wave motion set up in the gaseous refrigerant within the depend erably, each of thetubes 9\| is provided with an inlet end or opening 92 disposed ata relatively . ing intake conduit 34 and the chambers 86 and 'y ' sharp angle with respect to the axis of the tube 81 in the mui‘iier casing is substantially all dissi and an outlet end 93 disposed adjacent the end pated in moving- such columns of gaseous re frigerant. The volume of the muiiler chambers 10 wall 94 of the lower casing section 8|. The lower end of the depending intake conduit 34 86 and 81 should be relatively large as compared is secured in an opening 95 provided in the end to that of the tubes 9|, the internal diameter of each of the chambers being of the order of 9 wall 88 of the upper casing section 80. I The end wall 94 of the lower casing section 8| times` the internal diameter of the tubes 9| and the overall height of the two chambers being 15 is provided with a centrally disposed and in wardly extending indentation 96 which defines approximately twice the diameter of the cham an annular reservoir 91 in the end wall 94. A bers.- Also, the volume 'of the mui'iier casing restricted aperture 98 is provided in the'inwardly should be somewhat larger than the volumetric displacement of the piston in the cylinder of _the extending indentation 96 which aiîo‘rds com 20 munication between the lower chamber 81 and 4compressor in, order to provide a‘reserve supply 20 of gaseous refrigerant in the muil'ier casing the interior of the enclosing casing I8 to pro vide -for the .escape from the lower chamber 81 thereby minimizing the surges of -gaseous refrig `of any lubricant accumulated therein, and to erant into the compressor on the suction stroke permit this lubricant to be drained back into and the accompanying vibratory disturbances. the lubricant reservoir |2a formed in the lower casing section I2. It will be observed that the lower ends 93 of the tubes 9| are arranged out - ‘ of alignment with the restricted aperture 98 pro ` vided in the inwardly extending indentation 96 V'to prevent >the gaseous refrigerant emerging from’the outlet ends 93 of the tubes 9| from interfering with the escape of lubricant accumu lating in the annular reservoir 91 throughthe restricted aperture 98. 'I‘he area l of 'the restricted aperture 98 is small as compared to _ the area'of the tubes 9| in order to insure that- the pressure drop through the restricted Vaper _ ture 98 is relatively great as compared to the pressure drop through the tubes 9|. 'I'his ar' rangement insures that substantially no gaseous refrigerant will be drawn into the lower chamber 81 of the muiller casing through "the restricted aperture 98, yet lubricant accumulating therein will be permitted to escape.' ` ' \, During the operation -of the refrigerating ma chine gaseous refrigerant is drawn into the lower- While I have shown a particularl embodiment of my invention in connection with a house hold type of refrigerating machine, I do not de sire my invention to be limited to the. particular construction shown and described, and I intend in the appended claims to cover all modiñcations 80 within the spirit and> scope of my invention. What .I claim as newl and desire to secure by Letters Patent of the United States is: l. A refrigerating machine comprising a com pressor, a motor for driving said compressor, an enclosing casing for said compressor having a lubricant reservoir in the lower portion thereof containing a body of -lubricant and gaseous re frigerant in the upper portion thereof, means >for establishing a zone inthe upper. portion of 40 said enclosing casing substantially free of any ' frothy lubricant present' in said enclosing cas- 4 ‘ ing, an intake muiiler for said compressor, meansl including an inlet opening arranged in said zone for conducting gaseous refrigerant from said zone to said muiller, 'and means for conducting chamber 81 of the intake muiller from the zone gaseous refrigerant from said muiller to said substantially free >of frothy lubricant in the compressor..- - upper portion of the enclosing casing I8 through 2. A refrigerating machine comprising a com-_ pressor, a motor for driving said compressor, an .the relatively long restricted tubes 9|. The gase ous refrigerant flows from the lower chamber 81 enclosing casing for'said compressor having a through the restricted passage 85 formed in the lubricant reservoir in the lower portion thereof `transverse partition 84 into the upper chamber containing a body of .lubricantvand gaseous re 86 of the muffler casing.` The gaseous refrigerant frigerant in the upper portion thereof, means is then drawn from the upper'A chamber 88 operated by said motor for establishing a zone through the depending intake conduit 34 into the in the upper portion of said enclosing casing sub stantially free of any frothy lubricant present in mufile box 3| and the compressor I6. Any lubri cant gaining entrance into the muiilèr casing 8| said enclosing casing, an intake muiiier for -said escapes through the 'restricted aperture 98 pro ~compressor, means including an inlet opening vided in the inwardly extending indentation 86 arranged in said zone for conducting gaseous re and 'is .drained back into the'lubrlcant reser frigerant from said zone to said munier. `and means for conducting gaseous refrigerant from’ voir |2a. l In an intake ’ mumer sucnas :t have inustraœdï’ in Figs; 4 and 5, designed for use in conjunction said muiiier to said compressor. ` 3. A‘refrigerating machine comprising a ver with a sulphur -dioxide refrigerant compressor, - tical shaft motor, ajcompress'or having a cylin ' two tubes 9| should be employed to conduct gase ous refrigerant into the muiiler casing. Each of ' the tubes should have an overall length approxi mately 40 times the internal diameter thereof .70 so that an extended muiiling path of restricted cross-section is formed between the inlet and -, outlet -ends of the tube. Also, the outlet ends of the tubes should extend into the muilier casing der .supported on top of said motor. an enclosing casing for said motorand said compressor having ' a lubricant reservoir in the lower portion thereof e : containing .a body of lubricant and gaseous refrigerant in the upper portion thereof, means in 70 cluding an eccentric counter-weight carried by the upperportion of said shaft for counteracting dynamic unbalance of said compressor and for in close proximity to the end wall 94 of the establishing a zone in the upper portion of said 75. lower casing section 8| so that the end wall _ enclosing casing substantially free ofany frothy 75 _ver V V l 1 5 251334,876 lubricant present in said enclosing casingf, an ì I l5'. `A refrigerating- machine comprising a com intake _muilier for said comp?essor,_ means in pressor; a-motor for driving said compressor, an cluding a relatively long- restricted tube having enclosing casing-forlsaid vcompressor and said an inlet opening arranged in said zone for con 'motor havirigva.v lubricant reservoir formed inv ducting gaseous refrigerant'fro'mv said zone to?l the lower portion .-thereof_containing a body of said muiiler, and means including "a conduitfor' ~- '- lubricant and gaseous refrigerant in the upper - conducting gaseous refrigerant from said mu?‘lerA portion thereof, '.meansoperated -by said motor to said compressor cylinder. ` z -:for establishingäa -zone in the upper portion of 4. A refrigerating machine.comprisingaxcom-l said enclosing- casing substantially free of any 10 pressor, a motor for ,driving c said compressor, >an >1 .frothylubricant‘ present> in said enclosing cas enclosing casing for said compressor -havin'g‘j'av ' lubricant reservoir inv the lowerp'ortion"tlae?cof- conta'imng a'body 0f lubricantì and. gáseous'ré; ` frigerant in the upper- portionnthereof',.means operated by said motor for establishing -a zone l0 "ing,- an intake muiiier for said compressor ar- ' ' ranged in said enclosing lcasing», said muiiier hav- . ing a casing, means constituting a transverse partition in.' said mumer casing and provided with a'restricted passage -therein forming a plurality in' the upper portion of said enclosing -casing„sub-_` ' cfl communicatingchambers in said muiiier cas „ stantially free of any frothy lubricant> present in Qing, a relatively lon‘g restricted tube having an Y 7 said enclosing casing, an intake vmuiiier‘for saidv @inlet opening arranged» in said zone` for con i compressor >arranged in said enclosing casing, " ducting gaseous refrigerant from said zone to 20 means including an inlet opening arrangedl in one of said chambers in said muilier; a restricted said zone for conducting gaseous refrigerant ,from f aperture >in -said muiiler casing and arranged to 20 said zone to said muiiler, a- restricted-'aperture in" provide for the escape from said muffler casing said muilier and arranged to provide for .the- ,' óf any lubricant accumulating therein, and a , 25 escape from said muiiler of any lubricant acci'x-l f conduit for conducting gaseous refrigerant from mulating therein, and means for* conducting gas' another o'f- said chambers in said muiiler casing> 25 . eous refrigerar'rt from said mumer to saidlcòm- f to said compressor. presser. » - J ‘ , CARL H. STEENSTRUP.