US2413653A

US2413653A - Refrigerant compressor valve arrangement

Info

Publication number: US2413653A
Application number: US510315A
Authority: US
Inventors: Francis I Rataiczak
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1943-11-15
Filing date: 1943-11-15
Publication date: 1946-12-31
Anticipated expiration: 1963-12-31

Description

3 1946- I F. RATAIC'ZAK 2,413,653

REFhIGERANT COMPRESSOR VALVE ARRANGEMENT Filed NOV. 15, 1943 Hll 44 4 is: I MI 40 I INVENTOR.

Patented Dec. 31, 194% para "r v w th REFRIGERANT UDMPRESSQR VALVE ARRANGEMENT Francis 1. Rataicaak, Dayton, t'iliio, assignmto General Motorsflomration, Dayton, Ohio, a

corporation of Delaware Application November 15, 1943, Serial No. 510.315

s c ion. 82-415) This invention relates to refrigerating appa-- ratus andmore particularly to an improved refrigerant compressor valve arrangement for use v in a refrigerating system.

This application is directed to an improvement over the arrangement disclosed in my copending application Serial Number 394,645; filed May 28, 1941.

More particularly it is an object of this invention 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 description, reference being had to the accompanying drawing, wherein a preferred form of the present invention is clearly shown.

In the drawing:

Fig. 1 somewhat diarrammatically shows a refrigerating system including a compressor constructed in accordance with my invention;

Fig. 2 is a fragmentary sectional view on a enlarged scale showing the valve'assembly.

Referring now to the drawing in which I have shown a preferred embodiment of my invention reference numeral ill designates generally ahermetically sealed motor compressor unit. Reference numeral i2 designates a substantially cupshaped stamped sheet metal casing which forms the main support for both the compressor assembly generally designated by the reference numeral 86 and the motor stator iii. Reference numeral l8 designates a conventional motor rotor. A stamped sheet metal end cap i'i encloses the upper end of the cup-shaped casing 82 and forms therewith a high pressure refrigerant vapor chamber. The end cap it is welded or otherwise secured to the main casing 52. Heat conducting fins 2! may be secured to the outside of the casing element 52 to help dissipate the heat. The high pressure gas flows through the condenser 26 in which it is condensed and collects in liquid phase in the receiver 22. The liquid refrigerant flows from the receiver 22 into the evaporator 24 through a conventional refrigerant flow control device 28. The refrigerant flow control device may be of any conventional construction and is preferably of the fixed restrictor type in which the high pressure liquid refrigerant is required to flow through a long narrow capillary passage. v

Th refrigerant vaporized in the evaporator 24 returns to the compressor through the element 28 which communicates with a passage 30 formed in the compressor mounting block 82. The upper end of the passage 30 is provided with an enlarged portion 38 in which a check valve assembly generally designated by the reference numeral 38 is mounted. The check valve assembly Bil comprises a tubular element 10 provided with an internal 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 member 46 is provided which is formed out of a fiat 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 valv plate 44 but also serve to limit the downward movement of the element it within the element 40. The outer diameter of the element is slightly less than the diameter of the passage in which it is mounted whereby the element at is free to adjust itself within the passage W. A neoprene gasket 53 is provided as shown-and serves to provide a gas tight joint between the outer wall of the element 40 and the wall of the passage 30.

The valve assembly 38 is held in place in the recesses by the compressor and plate element til which is secured to the block 32 and one or more additional blocks 39, which in turn are welded or otherwise secured to the bottom wall of the casing l2. The bottom surface of the compressor and plate 50 is a lapped surface whereas the top surfaces of the mounting blocks 82 and 33 are merely rough cut surfaces. 'The term "rough cut surface as used herein is intended to designate a surface such a produced by the ordinary cuftirg tool of a latheas distinguished from a highly polished or lapped surface. It has been found that the

blocks

32 and 39 may be used to accurately support the compressor in true perpendicular relationship with respect to the axis of the central o ening of th motor stator, even thoueh not all of the tool marks have been removed from the upper surface of the mounting blocks.

The upper end surface 51 of the element to is 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 asket 53 is such that when th compressor is fastened onto the

mounting blocks

32 and 39 by one or more bolts 53, the surface 51 is held firmly in engagement with the machined sur ace of the compressor end plate element 50. By virtue of this arrangement it is obvious that the valve assembly 88 is held in erant vapor from place solely by the compressor end plate It whereby in the event of valve failure, the damaged valve part or parts may be replaced with a minimum amount of difliculty.

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 il which include the main bearing 5%. The compressed refrigerant leaves the compressor, through the outlet 80 which discharges into the interior of the main motor-compressor casing II, in accordance with standard practice whereby ing the compressor corresponds to the highside pressure.

The compressor assembly i4 shown in the drawthe pressure surround-' elements is: are provided with lugs m and m which are bent over so as to hold the motor sta- .tor in proper position within the casing if.

The foregoing construction reduces the number of parts required and simplifies the machin-- might be adopted, as'may come within the scope of the claims which follow. I

ing is intended to represent any conventional rohaving a bottom inlet port such as the port 18. In view of the fact that many of the details of the compressor are immaterial to my present invention, it is not deemed necessary to give a detailed description of the. compressor and its mode of operation. in this application. For a more detailed description of the compressor construction shown herein reference is hereby made to my aforementioned copending application.

The end plate 80 is provided with a tapered passage 18 which conveys the low pressure refrigthe inlet valve assembly to the compression chamber 88. By virtue of the taperin the walls of the passage I8, any slight misalignment between the end plate 50 and the inlet valve 38 will not interfere with the free flow of refrigerant from the inlet valve to the compression chamber. The mounting block 32 is provided with'a refrigerant charging plug 88 which has a first passage 88 communicating with the compressor inlet passage 30 and a second passage 88 communicating with the passage 90 in the mounting block 32. The lower end plate 50 of thecompressor is cut away as at 92 so as to provide a passage from the high pressure refrigerant chamber to the passage 88 and the passage l8. The outer ends of the

passages

88 and 88 are sealed by means of a plug 94 and a lead plated copper gasket 98. The gasket 96 is provided with apertures $8 in alignment with the

passages

88 and 88. The plug 94 is provided with a single passage I80 through which refrigerant and/ orlubricant may be added to or removed from the refrigerant system upon partially unscrewing the plug 84. By virtue of this arrangement, both the high side and the low side of the refrigerating system may be very quickly evacuated prior to chargingthe tary compressor 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 devices it has been customary to provide a press fitbetween the outer shell of the compressor and the motor stator. In such an arrangement, it is very difficult to properly hold the motor stator What is claimed is aafollows: 1 i. In a refrigerating system, a compressor, a casing enclosing said compressor, said compressor having an inlet port in one wall thereof and having a lapped surface adjacent tosaid inlet port, means for discharging the compressed refrigerant into said casing, a compressor mounting block secured to said casing and having a low pressure refrigerant vapor passage therein communicating with said inlet port, means providing a gastight seal between the passage in said mounting block and said compressor including a tubular insert in said vapor passage having a lapped surface inengagement with the lapped surface on said compressor, and a gasket means between said tubular insert. and the wall of said passage, said gasket means serving to urge said tubular insert into sealing engagement with the lapped surface on said compressor. f

2. In a sealed motor compressor mechanism, the combination, a casing, a compressor within said casing having a port in one wall thereof, said compressor having a smooth outer surface adjacent said port, a compressor mounting block projecting through one wall of said casing'and having a refrigerant passage in alignment with said port, and a valve assembly disposed within said refrigerant pe and held in place therein by the compressor. said valve assembly including means forming a gas tight sealwith said smooth surface.

3. In a compressor mechanism. the combination, a casing, a compressor within said casing having a port in one wall'thereof, a compressor I mounting block projecting through one wall of said casing and having a refrigerant'passage in alignment with said port. a valve assembly disposed within said refrigerant paseage and held in place therein by the compressor, said compressor and said valve assembly including opposed smooth surfaces, and resilient means holding said opposed surfaces in sealin engagement with one another.

4. In a sealed motor compressor mechanism, the combination, a casing, compressor mounting blocks secured within said casing, a refrigerant passage through one of said blocks, a valve assembly disposed within said passage, resilient in lace unless a very heavy cast iron frame or the equivalent is used, and once the motor stator is inserted, it is very dimcult to remove it for inspection or repair purposes. 'By virtue of the clamping arrangement shown, a light weight sheet metal casing may be used and the final sizing operation may be performed merely by forcing a die of proper size onto the open end of the casing so as to deform the projecting portion of the clamps ill! the necessary amount. This arrangement of parts and method of. sizing eliminates the necessity for turning the inner surface of the outer shell i2 to size on a lathe. The clamping means for biasing said valveassembly so as to project beyond the surface of said block, the projecting portion of said valve assembly including a smooth sealing surface, a compressor assembly having an inlet port in alignment with said passage and having a smooth surface in engagement with the smooth surface on said valve assembly.

5. In combination, a casing, a compressor mounting block within said casing, a refrigerant passage in said mounting block, a valve assembly disposed substantially within said passage, a motor stator disposed within said casing having a central opening therein, the upper surface of said mounting block comprising a' rough cut surface aeiaeee tral opening, a compressor assembly disposed within said casing and having a smooth surface arranged at right angles to the axis of said cenresting on said compressor mounting block and 7 having a port communicating with said refrigerant passage,'said valve assembly including an element having a smooth surface in sealing en gagement with said first named smooth surface, and a motor rotor disposed within said central opening in driving engagement with said com pressor. p 1

6. In combination, a compressor, a casing en closing said compressor, said compressor having a a prising a tubular member having a lapped end surface in engagement with said first named 'lapped surface, and means biasing said lapped surfaces into sealing contact with one another. FRANCIS I. RATAICZAK.