US3008629A

US3008629A - Compressor

Info

Publication number: US3008629A
Application number: US687977A
Authority: US
Inventors: Karl M Gerteis
Original assignee: Carrier Corp
Current assignee: Carrier Corp
Priority date: 1957-10-03
Filing date: 1957-10-03
Publication date: 1961-11-14
Anticipated expiration: 1978-11-14
Also published as: CH367926A; DE1195009B

Description

Nov. 14, 1961 K. M. GERTEIS COMPRESSOR Filed Oct. 3, 1957 2 Sheets-Sheet 1 FIGJ INVENTOR. KARL M-GERTEIS ATTORNEY FIG.3 //////////////////////////4 Nov. 14, 1961 K. M. GERTEIS 3,008,529

COMPRESSOR Filed Oct. 3, 1957 2 Sheets-Sheet 2 KARL M- GERTEIS BYWJQ ATTORNEY United States Patent I 3,008,629 COMPRESSOR Karl M. Gerteis, Syracuse, N.Y., assignor to Carrier Corporation, Syracuse, N.Y., a corporation of Delaware Filed Oct. 3, 1957, Ser. No. 687,977 25 Claims. (Cl. 230-58) This invention relates to hermetic compressors and,

. more particularly, to welded 'shell type hermetic compressors wherein the motor is connected to a vertically disposed crankshaft which is operatively connected to a plurality of pistons disposed in cylinders located beneath the motor.

With the broader acceptance and use of air conditioning and refrigeration systems, not only has the industry become more competitive, but a greater number of design restrictions have been placed on equipment fabricated. With respect to compressors of these systems, the primary objective is to provide a compressor which will be dependable and inexpensive to produce. An important objective is to provide a compressor of such compactness as to enhance its versatility for use in various air conditioning and refrigeration units wherein space considerations are of great consequence.

Generally, in multiple cylinder compressors, each cylinder is provided with a cast iron head member which is placed in communication with the other head members of the compressor by means of a cast iron or sheet metal manifold. Not only are these cast members expensive to manufacture, but they require extensive sealing surfaces and fastening means to maintain them in position.

The present invention is directed to a multiple cylinder unit, wherein the cylinders are arranged in a radial orientation in an arrangement whereby individual head members are not required for the cylinders. In the present invention, a single shell envelops the cylinder section of the compressor incorporating therein the functions of a cylinder head and a manifold. Incorporated also in this construction is a unique mufliing arrangement.

The chief object of the present invention is to provide an improved hermetic reciprocating compressor.

Another object of the invention is to provide a compressor employing an annular cylinder head which is common to all the cylinders and incorporates therein the function of a manifold.

A still further object of the invention is to provide a compressor having a combined annular head and manifold construction incorporating therein means for substantially mufiling the pulsating character of the gases.

A further object of the invention is to provide a compressor having an improved valve assembly.

A still further object of the invention is to provide a compressor having an improved valve retaining means. These and other objects of the invention will be made more apparent from the following description.

The present invention relates to a reciprocating compressor comprising a compressor block having a vertically extending crankshaft journalled therein. The block defines a plurality of cylinders in which pistons are reciprocatingly mounted. These pistons are operatively connected to the crankshaft. Encompassing a portion of the compressor block is an annular shell which is in sealing contact with flanges provided on the cylinder block to define an annular cavity encompassing said cylinders. Valve plate assemblies are provided at the end of the cylinders and spring means are provided between said valve assemblies and the shell to bias the valve assemblies in position. This construction thereby provides an annular space into which the discharge gases from all the cylinders are passed and further this space incorporates a 1 into which the discharge gases from the cylinders 19 and a 3,008,629 Patented Nov. 14, 1961 "ice plurality of partitions joined by restricted openings which FIGURE 1 is a sectional view of a compressor employing the present invention.

FIGURE 2 is a fragmentary view in section of the valve assembly employed in the present invention.

FIGURE 3 is a developed view in section of the annular space comprising the cylinder heads and manifold of the present invention including a desired mufller configuration. FIGURE 4 is a view of the discharge valve of the present invention.

FIGURE 5 is a view of the suction valve of the present invention.

FIGURE 6 is a view of the discharge valve movement limiting means, and,

FIGURE 7 is a view in plan of the valve retaining means showin in FIGURE 2.

Referring to FIGURE 1, there is shown the compressor embodying the present invention. The compressor 2 comprises an upper shell 4 and a lower shell 5. These shells are provided with flange sections 6 and 7 which are intended to meet in a sealed connection. Also included in the compressor is a third shell 8 having a flange 9 which is joined to flanges '6 and 7 by means of an annular weld 10. By this construction, a hermetic housing is formed.

The shell 8 has provided therein suitable openings :11 in the flange 9 which permit communication between the upper and lower portions of the housing for a purpose tobe described more fully hereinafter. The shell 8 also has a lower opening 12. Mounted within the inner shell 8 is a compressor block 15 which consists of a motor flange portion 16 and a crankcase flange portion 17 divided by a suitable partition 18. Located in the compressor block 15 are

suitable cylinders

19 and 20. The present invention is designed to be a four-cylinder radial compressor. However, other cylinder arrangements may be utilized without extending beyond the scope of the present invention. Suitable pistons 21 and 22 are reciprocatingly mounted within the

cylinders

19 and 20 and these pistons have mounted therein suitable wrist-pins 23 and 24 which are connected to the connecting rods 25 and 26. The connecting rods are journalled on the eccentric portion of the crankshaft 30. I

At the extremity of the

various cylinders

19 and 20 there are located suitable valve assemblies 31 and 32 which will be described more fully hereinafter. These valve assemblies are retained within their respective posi-v tions by suitable spring retainers, which will also be more fully described hereinafter. These spring retainers 33 and 34 are biased between the valve assemblies 31 and 32 and the shell 8, thereby retaining the valve assemblies in position upon the shoulder provided therefor in the various 20 are passed after passing through the valve assemblies 31 and 32. Suitable cavities are formed by partitionswithin this annular space 41 to provide a plurality of spaces connected by constricted openings which will be I more fully described herein-after.

During normal operation of this compressor, gas is introduced into the hermetic shell construction through the opening 63 which introduces suction gas into the motor compartment 13 of the compressor. This gas ultimately passes over the motor, cooling the motor. The

gas is then introduced into the various cylinders by means 'of the suction ports 45 which are located at the juncture of the partition '18 and the flange 16. This construction will be described more fully hereinafter.

The partition 18 of the compressor block has provided therein a bearing 46 into which the crankshaft 30 is rotatably mounted. This crankshaft 30 comprises a straight portion which is adapted to be connected to the motor 56, bearing portion 51 which is adapted to be rotatably journalled within the bearing 46 and an eccentric portion adapted to be connected to the various connecting rods which are operatively associated with the pistons. Below the eccentric portion there is a counterweight section 53 which is an irregular portion designed to aid in counteracting the unbalance of the eccentric portion of the shaft. Below this counterweight section 53, there is located the lower bearing portion 54 which fits within the bearing block 64 to be more fully described hereinafter.

Considering the motor 56, this motor comprises a stator 57 which is mounted within the motor flange portion 16 of the compressor block. The stator is inductively associated with the rotor 58 which is force-fitted onto the crankshaft section 50. Attached to the rotor 58' is a suitable counterweight 59 which is also intended to aid in counteracting the unbalance of the eccentric portion 52 of the crankshaft 30.

In order to introduce electric current into the stator 57, a suitable hermetic plug 60 is provided in the shell of the compressor. Extending from this plug 60 are a plurality of conductors 61 which are connected to the stator 57.

The crankshaft 30 is mounted within a lower bearing block 64 which has a lower bearing insert 65 which is adapted to journal the section 54 of the crankshaft. This lower bearing insert is maintained in position by a suitable snap-ring 62 which is seated within the compressor block itself. This bearing block includes the bearing insert 65 and a thrust bearing 66 which has a central hole 67, the function of which will be described hereinafter.

Located in the lower portion of the crankshaft adjacent the bearing portion 54, is a concentric hole 68 which constitutes the eye of the impeller of the pump which lubricates the various hearings in the compressor. The eye is a vertically extending hole from which extends the radial hole 69 which is in communication with the annular space 71. This space is below the bearing insert 65 and is in communication by means of a passage 72 with a bypass filter 73, which is, in turn, in communication With the crankcase 14-.

In communication with the radial hole 69 is the vertical passage 70, which is also in communication with the lower bearing surface of the compressor, the upper bearing surface of the bearing 46 and the various connecting rod bearings providing lubrication for these surfaces in a manner to be described more fully hereinafter.

Referring to FIGURE 2 there is shown an enlarged sectional view of a suitable valve assembly arranged in the end of a cylinder. The cylinder 19 extends outwardly and has a shoulder 91; an annular recess 90 is formed in the shoulder which is in communication with the suction port 45. This port is an opening passing substantially at the juncture of the partition 18 and the flange 16 and is in communication with the motor compartment 13. By this route suction gas passes through the suction port 45 into the annular space 90 below the valve assembly 31.

The valve assembly 31 is provided with an annular channel 94 having a general U-shape cross-section, leg 94' of the U being in communication with the annular space 90.

The other leg 94" of the channel 94 is in communicationthis annular section 101 is the S-shaped section 102 which has the ends of the 8 attached to the annular portion. At'

the extreme center of the S shape, there is an opening 103 which is adapted to be connected to the valve plate 31' by means of the rivet 98. In spaced relationship along the periphery of the annular member 101 of the valve member are protuberances 104.

It will be noted that by this particular configuration, the S shaped member is an elongated beam portion which is subject to deflection upon the suction stroke of the compressor piston. As this occurs, the annular portion 101 of the valve is in spaced relation from the valve plate 31. In order to limit the movement of this valve an inner spaced shoulder 92 is provided within the cylinder. This shoulder is adapted to engage the protuberances 104 and thereby limit the movement of the valve member 95 during operation.

Referring to FIGURE 2, the valve plate '31 is provided with an inner circle of discharge ports 93 which pass directly through the plate. Engaging the plate at the upper portion and covering the series of openings 93 is the valve member 96 which is the discharge valve in the present invention. Referring to FIGURE 4, there is shown a plan view of this particular valve member.

The valve member comprises an annular seating portion 105 which is also connected to an inner S-shaped portion 106 having a center hole 107. This particular valve functions in much the same fashion as the suction valve shown in FIGURE 5. However, this particular valve is not provided with any peripheral protuberances. In order to limit the motion of the valve during operation, a valve retainer 97 is provided.

This valve retainer is illustrated in FIGURE 6 and comprises an annular portion 110 which is a flanged portion adapted to engage the plate 31'. At the inner portion thereof is a second seat 111 having an opening 111' which engages the valve member 96. This particular portion is adapted to be connected to the valve plate by means of the rivet 98. Between the portion 111 and the annular engaging surface 110 is an annular planar portion 112 which is spaced substantially from the valve plate 31. This portion 112 is provided with a plurality of spaced opening-s for the purpose of permitting the discharge gases from the cylinder to pass through the valve plate and into the annular chamber between the compressor block and the annular shell 8. This spring retainer limits the movement of the valve member 96 in much the same fashion as the shoulder 92 and protuberance 104 of the suction valve. A more detailed description of the valve assembly is given in my copending application Serial No. 687,975, filed October 3, 1957, now US. Patent No. 2,935,248, issued May 3, 1960.

In order to maintain the valve assembly 31 against the shoulder 91, the spring member 33 is provided. As is illustrated in FIGURE 2, this spring member is biased against the shell member 3 and urges the valve plate 31 against the shoulder 91.

Referring to FIGURE 7 there is shown a plan view of the spring member. 33. From this View it is noted that the spring member 33 comprises an inner dome-shaped portion 114 having a plurality of legs 115 extending therefrom. It will be noted that the dome-sl1aped portion 114- is in contact with the shell 8, while the radially extending leg portions 115 are in engagement with the member 97 of the valve assembly. the leg portions 115 of the spring member 33 provide spaces therebetween through which the discharge gases may pass into the annular chamber between the com-.

pressor block'and the shell 8.

Referring to FIGURE 3, there is shown a developed view of the periphery of the compressor block illustrating the projection of the various cylinders passing through said cylinder block. The compressor as shown is a four cylinder compressor; however, other numbers of cylinders may be utilized. The cylinders '19 and 20 appear in It will be noted that;

all

FIGURE 1. Cylinders 19' and 20 do not appear in FIGURE 1 because they are either in front of or behind the crankshaft. From this view it is apparent that the cylinders are spaced longitudinally. along the crankshaft. Connecting the various cylinders are radially extending partitions 80, 81 and 82. It will be noted that by this orientation of partitions an upper annular cavity 83 is formed into which the

cylinders

19, 19, 20 and 20 discharge gases. TheSe gases then flow through the constricted opening 84 into the cavity 85. From the cavity 85 the gases pass through the constricted opening 86 into the cavity 87 and then through the constricted opening 88 into cavity 89 and the cavity 89 as can be seen from FIGURE 1 is connected to the discharge tube 42 which pases through the

shells

8 and 5. By passing the pulsating gases fed into the chamber 83 through the series of cavities and constricted openings, the gas is expanded from cavity to cavity so that the gas passing from the cavity 89 is at a substantially even pressure, having lost most of its pulsation.

Considering the operation of the compressor, electric current is introduced through the plug 60 and this current is passed through the conductor 61 into the stator 57 of the motor 56. This causes the rotor 58 to rotate, thereby imparting rotation to the crankshaft 30. Since the connecting rods 25 and 26 are connected to the eccentric portion of the crankshaft 30, and since the opposite ends of these connecting rods are connected to the wrist-pins 23 and 24 which are attached to the pistons 21 and 22, reciprocation of these pistons within the

cylinders

19 and 20 occurs, causing the compression of the gas therein.

Initially gases are introduced through the opening 63 into the motor compartment 13 where the suction gases pass over the motor 56, cooling said motor and then passing into the openings 45 of the various cylinders in the compressor. These suction openings 45 lie at the juncture of the flange 16 and the partition =18 which separates the crankcase and the motor compartment of the compressor. Referring to FIGURE 2, the gas passing through the opening 45 enters the substantially annular recess 90 within the shoulder portion 91 of the cylinder. The gas enters the U shaped annular passage 94 within the valve plates 31 and on the suction stroke of the piston, the valve member 95 is deflected, causing the gas to flow into the cylinder. The movement of the valve 95 is limited by the protuberances 105 and the second spaced shoulder 92 within the cylinder. On the compression stroke the valve member 95 is urged against the valve plate 31 and the gas passes through the :annularly disposed openings 93 causing the valve member 96 to deflect, permitting the gas to flow into the annular space between the compressor block and the shell 8. The gas passes through the openings in the valve retaining plate 97 and the valve retaining spring 33. The gas passes through the valve plate, then enters the manifold chamber as illustrated in FIGURE 3.

Referring to FIGURE 3, the gas passes into the annular cavity 83 and passes through the previously mentioned

cavities

85, 87 and 89 which are connected by the

openings

84, 86 and 88. The cavity 89 is connected to the discharge tube 42 illustrated in FIGURE 1. As the gas is continually constricted and expanded through the various openings and cavities, the pulsating nature of the gas which is strongly evident in the annular space 83 is substantinally muffled.

Lubrication of the compressor is carried out by circulating the lubricant in the lower section of the shell which constitutes the oil sump 76, having an approximate level of 77. As the crankshaft rotates, the oil passes through the hole 67 in the thrust bearing 66 into the concentric opening 68 in the lower portion of the crankshaft 30. This oil passes from the opening 68 into the lateral hole 69 where a portion of the oil is centrifugally passed outwardly into the annular space 71. The

oil then flows from this annular cavity into the passage 72 through the bypass filter 73 and into the crankcase 14.

The remainder of the lubricant passes from the radial hole 69 into the vertical passage 70 up to the bearing 65, the connecting rod bearings and to the upper bearing 46.

It will be noted that the discharge gas bypasses the piston thereby placing'the crankcase at a gas pressure greater than suction gas pressure whereas the motor compartment 13 is at substantially suction gas pressure. Because of the difference of pressure acting upon the oil sump 76 the present construction would cause the displacement of oil from the crankcase into the annular passage which lies between the

shells

5 and 8 thereby providing an annular space for the storage of oil. This construction is more fully described in the co-pending application Serial No. 687,976 filed October 3, 1957, in the names of Karl M. Gerteis and Robert W. Ayling.

In view of the foregoing description, it will be appreciated that a reciprocating compressor construction has been illustrated which obviates the need of individual cast cylinder heads utilizing extensive fastening means such as bolts which require machining of the connected elements. The requirement for an extensive manifold system including amufiler is also obviated'because of the simplified construction wherein the compressor block and a third shell provide a combination manifold and compressor head which requires no threaded fasteners. This particular construction furthermore perm-its a simplified valve assembly construction having an inexpensive valve retaining means which is never in danger of loosening While I have described a preferred embodiment of my invention, it will be understood my invention is not limited thereto since it may be otherwise embodied within the scope of the following claims.

I claim:

1. In a reciprocating compressor, the combination of a compressor block, a vertically extending crankshaft journaled in said block, said block defining a crankcase and a motor cavity, a partition separating said cavity and crankcase, a motor mounted in said motor cavity and connected to the crankshaft, a plurality of cylinders radially extending from said crankcase through said block, a cylindrical shell in sealing engagement with said block defining an annular space encompassing said cylinders, said cylinders each having a first shoulder, said shoulder having an annularrecess in communication with the motor cavity, a valve assembly mounted in sealing engagement against said shoulder, and spring means located between the shell and the valve assemblies for biasing the valve assemblies in position.

2 The compressor according to claim 1 in which the spr ng means comprises a dome-shaped section, a plu rahty of legs radially extending from said dome-shaped section, the edge of said legs being in engagement With the valve plate and the dome being in engagement with the shell.

3. The compressor according to claim 1 in which partitlons extend in the annular space defined by the shell and the block to further define a plurality of cavities connected by constricted openings whereby gases passing from the cylinders will be subjected to a mufliing effect.

4. The compressor, according to claim 1, in which partitions extend in the annular space defined by the shell and the block to divide said space into a first annular cavity in direct communication with the cylinders and a plurality of cavities in communication with said annular cavity by means of constricted openings in said partitions.

5 The compressor, according to claim 4, in which the cavities are connected in series.

6. In a reciprocating compressor, the combination of an upper shell, a lower shell, said upper and lower shells being connected to form a sealed housing, a third shell located in said sealed housing forming an annular space between the third shell and the lower shell, said third shell being formed of sheet metal, a compressor block telescopically received by said third shell, a vertically extending crankshaft journaled in said block, said block defining at least one cylinder, a piston reciprocatingly mounted in said cylinder, said piston'being operatively connected to said crankshaft, said cylinder block being in sealing engagement with said third shell to define an annular cavity encompassing said cylinder, means including a valve plate assembly separating the annular cavity from the cylinder and a discharge tube extending from the annular cavity between the compressor block and the third shell through said third shell and said lower shell.

7. In a reciprocating compressor, the combination of an upper shell having a flange, a lower shell having a flange, an inner shell having a flange, said flanges being connected to form a sealed housing with the inner shell eing located within said housing so as to form an annular cavity between said inner shell and said lower shell, a compressor block telescopically received by said inner shell and having a plurality of spaced flanges in sealing engagement with the inner shell so as to define an annular cavity between the compressor block and the inner shell, said block defining at least one cylinder extending radially through said block and encompassed by said last mentioned cavity, valve means adjacent the radially outer portion of said cylinder, said valve means including a discharge opening in communication with said annular cavity whereby said inner shell forms a discharge manifold, a vertically extending crankshaft journaled in said block, a crankcase formed in said block and encompassed by said inner shell, a piston reciprocatingly mounted in said cylinder, said piston being operatively connected to said crankshaft, the lower portion of the sealed housing including the annular cavity between the lower and inner shells being adapted to act as an oil sump and a discharge tube extending from said annular cavity located between the compressor block and inner shell and extending through the inner shell, the lower shell, and the annular cavity therebetween.

8. The compressor according to claim 7 including a motor located in the upper portion of the housing connected to said vertically extending crankshaft, means for passing suction gas into said housing, said flange of the inner shell having a plurality of openings placing the upper section of the housing in communication with said oil sump.

9. A compressor according to claim 7 wherein the means providing sealing engagement between said inner shell and said telescopically received compressor block comprises a radially outwardly facing annular groove in said flanges and an O-ring in said groove, said O-rings being adapted to sealingly engage said flanges and said shell whereby said compressor may be easily assembled by inserting said block into said shell.

10. In a reciprocating compressor, the combination of a compressor block, a crankshaft journalled in said block, said block defining at least one radially disposed cylinder, a piston reciprocatingly mounted in said cylinder, said piston being operatively connected to said crankshaft, an annular shell member surrounding said block in sealing engagement therewith to define an annular cavity between said shell and said block, a removable valve plate assembly having a discharge valve opening therein adjacent the radially outer portion of said cylinder, said discharge opening communicating with said annular cavity whereby said annular cavity forms a discharge manifold about said cylinder and spring means for retaining said valve plate assembly in position, said spring means disposed between said valve plate assembly and said annular shell and biasing said valve plate assembly in sealing engagement with said cylinder.

11. A compressor as defined in claim 10 wherein said spring comprises a generally dome-shaped resilient member having a plurality of legs extending from an upper dome-shaped portion, said legs being in spaced engagement with said valve plate assembly and said upper domeshaped portion being in engagement with said annular shell member.

12. In a reciprocating compressor, the combination of a compressor block, a crankshaft journalled in said block, said block defining a plurality of radially extending cylinders, a plurality of pistons reciprocatingly mounted in said cylinders, a plurality of connecting rods connecting the crankshaft with said pistons, a cylindrical shell in sealing engagement with the block to define an annular space between said shell and said block, said annular space encompassing said cylinders, said cylindrical shell being open at one end thereof, said compressor block being telescopically received within said annular shell, a removable valve plate assembly having a discharge opening therein disposed adjacent the radially outer portion of each of said cylinders, said discharge openings con necting with said annular cavity whereby said annular cavity forms a discharge manifold about said cylinders, disc springs located in contact with each of said valve plate assemblies and said annular shell for retaining said valve plate assemblies in position.

13. A compressor as defined in claim 12 wherein said springs comprise a generally dome-shaped resilient member having a plurality of legs extending from an upper.

dome-shaped portion, said legs being in spaced engagement with said valve plate assembly and said upper domeshaped portion being in engagement with said annular shell member.

14. A reciprocating compressor, a compressor block, a crankshaft journalled in said block, a plurality of radially disposed cylinders in said block, a piston mounted in each of said cylinders, said pistons being operatively connected to said crankshaft, a cylindrical shell surrounding and in sealing engagement with said block defining an annular space between said block and said shell, said annular space surrounding said cylinders, a discharge valve assembly adjacent the radially outer end of each of said cylinders, said discharge valve assembly being in communication with said annular space whereby said space serves as a discharge manifold, radially extending partitions disposed within said annular space and dividing said space into a plurality of cavities, said cavities beng connected by constricted openings whereby gases from said cylinders are subjected to a mufiling efliect.

15,. A compressor according to claim 14 wherein one of said cavities is annular in from and in direct communication with each of said cylinders and the others are in restricted communication with said annular cavity by means of constricted openings in said partitions.

16. A compressor according to claim 15 wherein all of said cavities are in series connection.

17. In a compressor, a body, a shaft rotatably mounted in said body, a motor stator secured to said body, a motor rotor secured to said shaft, a plurality of cylinders in said body, said cylinders being arranged radially of the axis of said shaft, a piston working in each cylinder, piston rods pivotally connected to said pistons and to said shaft, a first flange on said body atone side of and extending outwardly beyond said cylinders, a second flange on said body at the other side of said cylinders, an annular member in sealed engagement with said first flange and said second flange to provide an annular discharge manifold in fluid communication with said cylinders, a sealed casing enclosing said body, said motor and said annular member, and resilient means on said sealed casing supporting said body, said motor and said annular member spaced from the walls of said sealed casing, and a discharge conduit secured to and in fluid communication with the discharge manifold and extending through said sealed casing.

18. The combination defined in claim 17 in which the discharge conduit is secured to said annular member in fluid communication with the discharge manifold and extends through said sealed casing.

19. The combination defined in claim 17 in which said resilient means comprises a flange extending outwardly from said annular member in engagement with said sealed casing to support said body in said sealed casing.

20. In a reciprocating compressor, the combination of a compressor block, a crankshaft journalled in said block, said block defining at least one radially disposed cylinder, a piston reciprocatingly mounted in said cylinder, said piston being operatively connected to said crankshaft, an annular shell member surrounding said block in sealing engagement therewith to define an annular cavity between said shell and said block, a removable valve plate assembly having a discharge valve opening therein adjacent the radially outer portion of said cylinder, said discharge opening communicating with said annular cavity whereby said annular cavity forms a discharge manifold about said cylinder, means for retaining said valve plate assembly in position, and said valve plate assembly being disposed in sealing engagement with said cylinder block.

21. In a compressor, a casing, a body in said casing, a shaft rotatably mounted in said body, a motor in said casing having a stator secured to said body and a rotor secured to said shaft, a plurality of cylinders on said body, said cylinders being arranged radially of the axis of said shaft, a piston working in each cylinder, piston r-ods pivotally connected to said pistons and to said shaft, a first flange on said body at one side of and extending outwardly beyond said cylinders, a second flange on said body at the other side of said cylinders, an annular memher in said casing in sealed engagement with said first flange and said second flange to provide an annular discharge manifold in fluid communication with said cylinders, a suction valve in each of said cylinders to control the flow of gas to said cylinders, a discharge valve cage in each of said cylinders, a discharge valve in each discharge valve cage to control the flow of gas from said cylinders to the discharge manifold, and a discharge conduit secured to and in fluid communication with the discharge manifold and extending through said casing.

22. In a reciprocating compressor, the combination of an upper shell, a lower shell, said upper and lower shells being connected to form a sealed housing, a third shell located insaid sealed housing forming an annular space between the third shell and the lower shell, said third shell being formed of sheet metal, a compressor block telescopically received by said third shell, a vertically ex tending crankshaft journaled in said block, said block defining at least one cylinder, a piston reciprocatingly mounted in said cylinder, said piston being operatively connected to said crankshaft, said cylinder block being in sealing engagement with said third shell to define an annular cavity encompassing said cylinder, means including a valve plate assembly separating the annular cavity from the cylinder and a discharge tube extending from the annular cavity between the compressor block and the third shell through said lower shell.

23. In a compressor, a body, a shaft rotatably mounted in said body, a motor stator within said body, a motor rotor secured to said shaft, a plurality of cylinders in said body, said cylinders being arranged radially of the axis of said shaft, a piston working in each cylinder, piston rods pivotally connected to said pistons and to said shaft,

a first flange on said body at one side of and extending outwardly bey ond said cylinders, a second flange on said body at the other side of said cylinders, an annular member in sealed engagement with said first flange and said second flange to provide an annular discharge manifold in fluid communication with said cylinders, a sealed casing enclosing said body, said motor and said annular memher, and means on said sealed casing supporting said body, and said annular member spaced from the walls of said sealed casing, and a discharge conduit secured to and in fluid communication with the discharge manifold and extending through said sealed casing.

24. In a compressor, a casing, a body in said casing, a shaft rotatably mounted in said body, a motor in said casing having a stator and a rotor secured to said shaft, a plurality of cylinders on said body, said cylinders being arranged radially of the axis of said shaft, a piston working in each cylinder, piston rods pivotally connected to said pistons and to said shaft, a first flange on said body at one side of and extending outwardly beyond said cylinders, a second flange on said body at the other side of said cylinders, an annular member in said casing in sealed engagement with said first flange and said second flange U0 provide an annular discharge manifold in fluid communication with said cylinders, a suction valve in each of said cylinders to control the flow of gas to said cylinders, a discharge valve cage in each of said cylinders, a discharge valve in each discharge valve cage to control the flow of gas from said cylinders to the discharge manifold, and a discharge conduit secured to and in fluid communication with the discharge manifold and extending through said casing.

25. In a reciprocating compressor, the combination of an upper shell, a lower shell, said upper and lower shells being connected to form a sealed housing, a third shell located in said sealed housing forming an annular space between the third shell and the lower shell, a compressor block telescopically received by said third shell, a vertically extending crankshaft journaled in said block, said block defining at least one cylinder, a piston reciprocatingly mounted in said cylinder, said piston being operatively connected to said crankshaft, said cylinder block being in sealing engagement with said third shell to define an annular cavity encompassing said cylinder, means including a valve plate assembly separating the annular cavity from the cylinder and a discharge passage extending from the annular cavity between the compressor block and the third shell through said housing.

References Cited in the file of this patent UNITED STATES PATENTS 1,292,283 Faber Jan. 21, 1919 1,665,052 Cadwell Apr. 3, 1928 1,821,688 Bourne Sept. 1, 1931 2,053,593 Zista et a1. Sept. 8, 1936 2,199,486 Doeg May 7, 1940 2,304,999 Gonzalez Dec. 15, 1942 2,494,606 Anderson Jan. 17, 1950 2,638,914 Flaith et al. May 19, 1953 2,674,406 Heckendorf Apr. 6, 1954 2,676,753 Britton Apr. 27, 1954 2,818,816 Christensen Jan. 7, 1958 UNITED STATES PIATENT'OFFICE CERTIFICATE OF CORRECTION Patent N0. 3,008,629 November 14,, I961 Karl M. Gerteis It is hereby certified that error appears in the above numbered petent requiring correction and that the said Letters Patent should read as corrected below.

Column 2, line 19, for "showin" read shown column 6, line 11, for "pressure" read pressures column 8, line 48, for "from" read form Signed and sealedithi's 17th day of April 1962,

(SEAL) Attest:

ESTON G. JOHNSON DAVID L. LADD Attesting Officer Commissioner of Patents