Dec-~31, 1946- I F. |. RATAIC'ZAK 2,413,653 REFhIGERANT COMPRESSOR VALVE ARRANGEMENT Filed NOV. 15, 1943 ‘ 2/ 3” ‘ 4 ' 4'3 32 84 as 9a z; f , 57s. 57 ,48 m L Hll\\ ‘ “' 88 _ \ ___ is: I MI l'l 44 42 40 :3 a2 I INVENTOR. Patented Dec. 31, 194% ’ para "r v with oar 2,413,653 REFRIGERANT UDMPRESSQR VALVE ARRANGEMENT 1 / ' Francis 1. Rataicaak, Dayton, t'iliio, assignm- to General Motors?omration, Dayton, Ohio, a I. corporation of Delaware ' Application November 15, 1943, Serial No. 510.315v ‘ sc ion. 82-415) 2 . This invention relates to refrigerating appa-~ larged portion 38 in which a check valve assembly _ ratus andmore particularly to an improved re generally designated by the reference numeral 38 frigerant compressor valve arrangement for use v is mounted. ' The check valve assembly Bil com prises a tubular element 10 provided with an in in a refrigerating system. _ This application is directed to an improvement over the ‘arrangement disclosed in my copending application Serial Number 394,645; ?led May 28, 1941. ' ' More particularly it is an object of this inven tion to reduce the amount of labor required in machining the parts of a compressor. ' Further objects-and advantages of the present invention will be apparent from the following de scription, reference being had to the accompany ing drawing, wherein a‘ preferred form of the 15 present invention is clearly shown. ' In the drawing: ternal shoulder which provides a valve seat 62. A valve plate 44 cooperates with the seat 62 in accordance with well-known practice. A combination valve stop and valve guide mem ber 46 is provided which is formed out of a ?at piece of stamped sheet metal material and bent into the shape shown. The element it includes three or more pointed projections 68 which serve , as stops for limiting the upward movement of the valve plate 44 and alsoincludes a plurality of valve guide members 5| which not only serve to guide the valve plate 44 but also serve to limit the downward movement of the element fit within the Fig. 1 somewhat diarrammatically shows a re frigerating system including a compressor con structed in accordance with my invention; Fig. 2 is a fragmentary sectional view on a element 40. The outer diameter of the element 60 is slightly less than the diameter of the pas 20 sage in which it is mounted whereby the element at is free to adjust itself within the passage W. enlarged scale showing the valve'assembly. ' A neoprene gasket 53 is provided as shown-and Referring now to the drawing in which I have serves to provide a gas tight joint between the shown a preferred embodiment of my invention outer wall of the element 40 and the wall of the reference numeral ill designates generally a‘her 25 passage 30. , ‘' metically sealed motor compressor unit. Refer The valve assembly 38v is held in place in the ence numeral i2 designates a substantially cup recesses by the compressor and plate element til shaped stamped sheet metal ‘casing which forms which is secured to the block 32 and one or more the main support for both the compressor as additional blocks 39, which in turn are welded sembly generally designated by the reference 30 or otherwise secured to the bottom wall of the numeral 86 and the motor stator iii. Reference casing l2. The bottom surface of the compressor numeral l8 designates a conventional motor ro and plate 50 is a lapped surface whereas the top tor. A stamped sheet metal end cap i'i encloses surfaces of the mounting blocks 82 and 33 are the upper end of the cup-shaped casing 82 and merely rough cut surfaces. 'The term "rough cut forms therewith a high pressure refrigerant va surface” as used herein is intended to designate por chamber. The end cap it is welded or other a surface such as produced by the ordinary cuf wise secured to the main casing 52. Heat con tirg tool of a latheas distinguished from a highly ducting fins 2! may be secured to the outside of polished‘ or lapped surface. It has been found the casing element 52 to help dissipate the heat. that the blocks 32 and 39 may be used to accurate~ The high pressure gas ?ows through the con 40 ly support the compressor in true perpendicular denser 26 in which it is condensed and collects relationship with respect to the axis of the cen- ' in liquid phase in the receiver 22. The liquid tral opening of the motor stator, even thoueh not refrigerant flows from the receiver 22 into the all of the tool marks have been removed from the evaporator 24 through a conventional refrigerant upper surface of the mounting blocks. flow control device 28. The refrigerant flow con 45 The upper end surface 51 of the element to is trol device may be of any conventional construc tion and is preferably of the ?xed restrictor type in which the high pressure liquid refrigerant is required to flow through a long narrow capillary passage. . ‘ v a lapped surface which when pressed against the lapped surface on the end plate Elli formsa gas tight seal between the element All and end plate so. The thickness of the gasket 53 is such that ‘ 50 when the compressor is fastened onto the mount The refrigerant vaporized in the evaporator 24 ing blocks 32 and 39 by one or more bolts 53, the returns to the compressor through the element surface 51 is held ?rmly in engagement with the 28 which communicates with a passage 30 formed machined surface of the compressor end plate in the compressor mounting block 82. The upper element 50. By virtue of this arrangement it is end of the passage 30 is provided with an en 65 obvious that the valve assembly 88 is held in 4 elements is: are provided with lugs m and m place solely by the compressor end plate It where which are bent over so as to hold the motor sta ' .tor in proper position within the casing if. by in the event of valve failure, the damaged valve part or parts may be replaced with a mini mum amount of di?iculty. The foregoing construction reduces, the num ber of parts required and simpli?es the machining operations onsthe few parts which are re quired thereby cutting the cost of assembly con - As shown in Fig. 1 the compressor assembly Ill comprises a lower end plate I.’ a cylinder ole- ment 5! and an upper end'plate ilhwhich includes siderably. the main bearing 5%. The compressed refriger ant leaves the compressor,“ through the outlet ' - ' - While the form of embodiment of the inven tion as herein disclosed constitutes a preferred 80 which discharges into the interior of the main form, it is to be understood that other forms motor-compressor casing II, in accordance with _ - might be adopted, as'may come within the scope the pressure surround-' standard practice whereby , ing the compressor corresponds to the highside of the claims which follow. What is claimed is aafollows: I ' 1 i. In a refrigerating system, a compressor, a The ‘compressor assembly i4 shown in the draw’ 15 casing enclosing said compressor, said compres ing is intended to represent any conventional ro- ' ‘ sor having an inlet port in one wall thereof and pressure. ~ tary compressor having a bottom inlet port such as the port 18. In view of the fact that many of having a lapped surface adjacent to- said inlet‘ - port, means for discharging the compressed re~ the details of the compressor are immaterial to frigerant into said casing, a compressor mount 20 my present invention, it ‘is not deemed neces sary to give a detailed description of the. com pressor and its mode of operation. in this appli cation. For a more detailed description of’ the compressor construction shown herein reference is ing block secured to said casing and having a low pressure refrigerant vapor passage therein communicating with said inlet port, means pro viding a gastight seal between the passage in said mounting block and said compressor including a hereby made to my aforementioned copending 25 tubular insert in said vapor passage having a application. ' _ lapped surface inengagement with the lapped . The end plate 80 is provided with a tapered surface on said compressor, and a gasket means passage 18 which conveys the low pressure refrig between said tubular insert. and the wall of said ‘erant vapor from the inlet valve assembly to the‘ 30 passage, said gasket means serving to urge said compression chamber 88. By virtue of the taper tubular insert into sealing engagement with the in the walls of the passage ‘I8, any slight misalign lapped surface on said compressor. f - ment between the end plate 50 and the inlet valve 2. In a sealed motor compressor mechanism, 38 will not interfere with the free flow of refrig the combination, a casing, a compressor within erant from the inlet valve to the compression 35 said casing having a port in one wall thereof, said compressor having a smooth outer ‘surface The mounting block 32 is provided with'a re adjacent said port, a compressor mounting block frigerant charging plug 88 which has a ?rst pas ' projecting through one wall of said casing'and sage 88 communicating with the compressor in ' having a refrigerant passage in alignment with let passage 30 and a second passage 88 communi 40 said port, and a valve assembly disposed within cating with the passage 90 in the mounting block said refrigerant pe and held in place therein 32. The lower end plate 50 of the’compressor is by the compressor. said valve assembly including cut away as at 92 so as to provide a passage from means forming a gas tight seal‘with said smooth chamber. \ , _ ' the high ‘pressure refrigerant chamber to the surface. . , passage 88 and the passage l8. The outer ends 3. In a compressor mechanism. the combina of the passages 88 and 88 are sealed by means is tion, a casing, a compressor within said casing of a plug 94 and a lead plated copper gasket having a port in‘ one wall'thereof, a compressor I 98. ‘The gasket 96 is provided with apertures $8 mounting block projecting through one wall of in alignment with the passages 88 and 88. The said casing and having a refrigerant'passage in plug 94 is provided with a single passage I80 alignment with said port. a valve assembly dis 50 through which refrigerant and/,or‘lubricant may posed within said refrigerant paseage and held be added to or removed from the vrefrigerant sys ‘ in place therein by the compressor, said compres tem upon partially unscrewing the plug 84. By sor and said valve assembly including opposed virtue of this arrangement, both the high side smooth surfaces, and resilient means holding said and the low side of the refrigerating system may opposed surfaces in sealing engagement with one 55 be very quickly evacuated prior to chargingthe another. ' ’ system with refrigerant'and lubricant. The motor stator I8 is held in place by means ‘of special clamps such as I02. In the prior art 4. In a sealed motor compressor mechanism, the combination, a casing, compressor mounting ‘blocks secured within said casing, a refrigerant devices it has been customary to provide a press passage through one of said blocks, a valve as ?tbetween the outer shell of the compressor and 60- sembly disposed within said passage, resilient the motor stator. In such an arrangement, it is means for biasing said valveassembly so as to very difficult to properly hold the motor stator project beyond the surface of said block, the pro in place unless a very heavy cast iron frame or . jecting portion of said valve assembly including the equivalent is used, and once the motor stator a smooth sealing surface, a compressor assembly 65 is inserted, it is very dimcult to remove it for in having an inlet port in alignment with said pas spection or repair purposes. 'By virtue of the sage and having a smooth surface in engagement clamping arrangement shown, a light weight sheet with the smooth surface on said valve assembly. metal casing may be used and the final sizing op 5. In‘ combination, a casing, a . compressor eration may be performed merely by forcing a die of proper size onto the open end of the casing 70 mounting block within said casing, a refrigerant passage in said mounting block, a valve assembly so as to deform the projecting portion of the disposed substantially within said passage, a mo clamps ill! the necessary amount. This arrange tor stator disposed within said casing having a ment of parts and method of. sizing eliminates central opening therein, the upper surface of said the necessity for turning the inner surface of the outer shell i2 to size on a lathe. The clamping 75 mounting block comprising a' rough cut surface aeiaeee . - 6 arranged at right ‘angles to the axis of said cen- ' tral opening, a compressor assembly disposed within said casing and having a smooth surface wall member having a ?uid passage therein, a compressor mounting member abutting said wall member and having a fluid passage substantially in alignment with said ?rst named passage, one resting on said compressor mounting block and 7 having a port communicating with said refriger 5 of’ said members having a lapped surface adja ant passage,'said valve assembly including an cent said passage, the other of said members have ing an enlargement in its ?uid passage, a valve element having a smooth surface in sealing en» gagement with said ?rst named smooth surface, assembly disposed within said enlargement com and a motor rotor disposed within said central prising a tubular ‘member having a lapped end . opening in driving engagement with said comm pressor. ‘ _ - p 1 6. In combination, a compressor, a casing en» closing said compressor, said compressor having a a surface in engagement with said ?rst named 'lapped surface, and means biasing said lapped surfaces into sealing contact with one another. FRANCIS I. RATAICZAK.