US1614100A - Compressor - Google Patents

Description

Jan. 11 1927. 1,614,100

J. O. CARREY COMPRESSOR I Filed Feb. 10. 1923 6 s t .s t 1 [n 0622507 Ja/m 4 6x772 Jan. 11,1927. 4JQO J. O. CARREY COMPRESSOR Filed Feb. 10. 1923 I 6 gheets.sheet 2 I v 151216226 0) 4| am 0. h?

1 1927' J. o. CARREY COMPRESSOR Filed Feb.

10: 1925 6 Sheets-Shut Jan. 11 1927.

" J. O. CARREY COMPRESSOR Filed Feb. 10. 1923,

. 6 Sheets-Sheet 1,61 100 Jan. 11, 1927. J Q CARREY v COMPRESSOR.

Filed Feb. 10. 1923 sh tysh t 5 ra l e M 1 Jan. 11 1927.

J. 0. CARREY COMPRESSOR Filed Feb. 10. 1923 s Shets-Sheet 6 pressors and more particularly to compres-' Patented Jan. 11,192?! PATENT OFFE JOHN O. CABREY, OF ST. LOUIS, MISSOURI, ASSIGNOB TO CARREYJMORSE ENGINFE R- ING- COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

comrnnsson.

Application filed February 10, 1923. Serial No. 618,321.

This invention relates generally to comsors for'refrigerating systems.

The objects of my invention are to provide a compressor which is compact in size and of strong and rigid construction, is inexpensive tomanufacture and Operate, and is practically noiseless in operation.

Further objects of my invention are. to provide a compressor in which the solution used as a refrigerant is effectively sealed and the possibility of the refrigerant leaking or escaping from the compressor is reduced to minimum.

Still further objects of my invention are to provide a set of'primary pistons which are operated directly by the driving mechanism and to provide a set of secondary or auxiliary pistons which are utilized to compress the refrigerant and are operated by the first set of pistons through the medium of a suitable fluid placed under pressure by said primary pistons.

'Further objects of the invention are to place in the fluid pressurechambers con- -necting the primary and secondary pistons suitable seallng means whereby the communication between the respective chambers in which said pistons operate is sealed and the passage of the refrigerant from the compression chamber to the primary pistons and the driving mechanism is thereby prevented.

Still further objects of the invention are to provide simple and efiicient valve means for controlling the inlet and outlet ports of the compression chamber and to generally improve upon and simplify the construction of the compressors of the class described and to provide simple and efficient means for positively sealing the circulating system of the refrigerant.

\Vith these and other objects in view, my invention. consists in certain novel features of construction and arrangement of parts hereinafter more fully described and claimed, and illustrated in the accompanying drawings, in which- Figure 1 is an end elevation of the compressor connected to a refrigerating system.

Figure 2 is a vertical cross section through the compressor.

' Figure 3 is a detail sectional view of the primary pistons and the driving connections therefor.

Figure 4 is a horizontal cross section taken on line 4-4 of Figure 2.

Figure 5 is a vertical cross section through the compression chamber showing the compression pistons and the valves operating therein.

Figure 6 is a vertical cross section taken on line 6'6 of Figure 2.

Figure 7 is a detail view showing the improved sealed bearings of the drivlng shaft of the compressor.

Figure 8 is a detail cross sectional view of one of the pressure operated valves.

Figure 9 shows perspective views of the cofinpression pistons and their connecting ro s.

Figure 10 is aperspective view of the sliding valve.

.Figure 11 is a perspective detail view of the stationary member designed to cooperate with the sliding valve.

Figure 12 'is a vertical'cross section taken on line 1'212.of Figure 5.

Figure 13 is an enlarged longitudinal section of a portion of the condensing coil. 1

Figure 14 is a vertical cross section through the same.

Referring by numerals to the accompanying drawings, 10 indicates a circular casing provided at its outer end with an outwardly presented annular flange 11 to whichis adapted to be secured a closure plate 12. The opposite end of casing 10'has secured to it a tubular housing 14 in which is journaled in suitable bearings shaft 15. Casing 10 is supported in suitable brackets 16 which are fixed to the peripheral wall of said casing and are adapted to besecured to a suitable support 17. The tubular housing 14 is preferably supported by a standard 18 which may be formed integral with said housing or secured thereto in any suitable manner. 7 j

The outer end of shaft 15 has fixed thereto a grooved pulley 19 over which passes belt 20 driven by a smaller pulley 21 fixed to the shaft of an electric motor 22. The opposite endof said shaft projects within casing 10 and has fixed thereto an eccentric 24 which is in operative engagement with the inner concaved ends 25 of blocks 26. The outer ends of blocks 26 are convexed as indicated at 27 and are designed to bear against s ring members 28 which are secured at t eir outer ends to box-shaped supports 29. A roller 30 is arrangedin each.

support 29 and is held in position therein by a bolt 31 and each block 26 is provided with a semi-circular recess 26 which forms a seat for hearing 30 so that each block 26 when actuated by eccentric 24 rocks about the axis of roller 30. Supports 29 are tied together by rods 32 and bolts 31 of bearings 30 have secured to their outer ends the ends of a bar 34. Rollers 30 and seats 26 are located on the opposite sides of center lines of blocks 26 so as to \receive the thrust of eccentric 24 and bar 34 serves to distribute this thrust to both supports 29.

Casing 10 is provided with diametrically opposed cylindrical pressure chambers 35 which are in horizontal alignment with blocks 26. Operating in these chambers are pressure pistons36 which are secured at their inner ends by suitable fastening devices 37 to supports 29. Each of these pistons which are preferably formed cup-shaped is provlded in its peripheral wall and near its inner end with a segmental slot 37* which, when its respective piston occupies its innermost position, is adapted-to establish communication between the interior of casing 10 and pressure chamber 35 so that oil may flow through said slot from the casing to the pressure.chamber. The outer end of each cylinder forming the pressure chamber 35 is connected to a diaphragm housing 38 which is arranged concentrically with said pressure chamber and is provided with a. diaphragm or flexible partition wall 39. The opposite end of diaphragm housing 38 is provided with a cylindrical extension 40 to which is secured by a union 41 the lower end of a pipe connection 42. These pipe connections curve upwardly and their upper ends are connected by means of unions 44 to the corresponding ends of a compression hous ing 45. This housing is provided with compression chambers 46 in which operate compression pistons 47 which are held in spaced relation by a connect-ing rod 48, the ends of which are secured to the inner ends of pistons 47 by screws 49.

The diaphragm housings 38 are preferably made in two halves and when the diaphragm 39 is placed in position, the mar ginal edge thereof is securely clamped between the flanged portions of said housing. thereby sealing the communication between the pressure chambers 35 and compression chambers 46. lVhe-n shaft 15 is operated, eccentric 24 revolves in the direction indicated by the arrow in Figures 2 and 3 and imparts, through the cooperation of blocks 26, reciprocating motion to pistons 36. Cas-- ing 10 and pressure chambers 35, housing 38 and-compression chambers 46 and pipe connections 42 are completely filled with suitable liquid such as oilso that when pis ,ton, 36 moves outwardly the liquid contained in pressure chamber 35 and the corresponding half of diaphragm housing 38 is placed under pressure, which pressure is imparted to the liquid contained in the outer half of the diaphragm housing and in the pipe connection 42 and the corresponding compression chamber 46, causing the compression piston 47 in said chamber to move under this pressure inwardly. Pressure pistons 36 being interengaged by means of supports 29 and tie rods 32, the opposite piston 36 moves inwardly into the casing 10, thereby permitting diaphragm 39 located in the corresponding housing 38 to move under the pressure created by the displacement of liquid in the opposite compression chamber by the corresponding compression piston 47 toward the pressure chamber 35.

During the downward movementof eccentric 23 the operation is reversed causing the parts to again move into the positions shown in Figure 2. Thus the pressure is imparted through the liquid contained in the pressure chambers 35 by connections 42 alternately to the opposite compression pistons 47 which are caused thereby to reciprocate in the compression chambers and-compress the fluid contained in the chamber between the inner ends of said pistons 47.

The diaphragms or flexible members 39 are designed to separate the liquids in the pipe connections 42 and pressure chambers 35 but are sufficiently flexible to allowtheir displacement from one side to the other so that the pressure created by pressure pistons.

36 can be successfully transmitted to the liquid contained in pipe connections 42 and compression chambers 46. v

A stationary valve seat member 50 is arranged in housing equidistant from compression chambers 46 and the walls of the outer ends of this member are tapered at 51 to fit the inwardly tapered walls 52 of' the inner ends of Member for sections which, gage the annular shoulders 45 formed in the inlet chamber 54of housing 45.

A sleeve 55 is slidably arranged on connecting rod 48 and the diameter of this sleeve is-less than the diameter of the bore in member 50, thereby forming an annular space '56. The ends wardly flared openings or bores 57 and adapted to be seated in these flared-out bores and closing'bore 56 are valves 58 which are sccured to the ends of sleeve 55. The outer faces of these valves are formed so that they fit snugly within the recessed inner ends of compression pistons 47 when the latter ocoompression pistons 47. convenience is made in two 'cupy their innermost positions, as shown in when screwed together, en-

of this bore terminate in out- 56. An outlet chamber 61 is arranged in housing above inlet chamber 54 and has connected thereto one end of outlet pipe 62. Ports 64 establish communication between the outlet chamber 61 and valve chamber 65, which latter is formed when the compression pistons 47 occupy their extended positions. Ports 64 are normally closed by pressure operated valves 66. Valve 66 is held to its seat in port 64 by a spring 67, the lower end of which rests in a recess formed in said valve while its upper end is seated in a recess formed in a plug 68 which is securely seated in position in housing 45. Valve 66 is preferably provided with a renewable plate 69 which fits in the valve seat and may be renewed when worn out.

In the operation of the machine, assuming the valves tobe in the position shown, in Figure 5,.the fluid to be compressed is admitted to the intake chamber 54 by pipe 59 and passes through openings 60 in member 56 into the annular space 56. The compression piston 47 in the righthand end of the compression chamber 46 is moved to its extreme outward position and the inner end of said piston is spaced away from the corresponding end of member 50, thereby forming valve chamber 65 into which the fluid passes from chamber 56 through the open bore 57. Valve sleeve 55 is of greater length than member so that when one of the valves 58 is engaged by the corresponding piston 47 and moved to its seat 57, the valve carried by the opposite end of said valve sleeve is moved an appropriate distance from its corresponding seat 57.

to permit the fluid to pass therethrough.

lVhen compression pistons 47 are moved in an opposite direction, i. e., in the direction indicated by arrow in Figure 5, valve sleeve 55 is caused to move through its frictional engagement with rod 48 simultaneously with pistons 47 until the righthand valve 58 seats itself in bore 57, thereby closing the communication between the intake chamber 54 and the righthand valve chamber and opening communication between the lefthand chamber 65 and said intake chamber. The continued movement of pistons 47 places the fluid contained in. the righthand valve chamber under pressure and when this pressure reaches a predetermined point it overcomes the spring of the corresponding valve 66, thereby unseating said valve and permitting the fluid to escape under pressure to the outlet chamber 61 and outlet pipe 62. The close fitting engagement of the inclined walls 51 of member 50 and of valve 58 and the inner end of compression piston 47 causes a thorough expulsion of fluid from the valve chamber into the outletchamber. Valves 66 are one-way valves and prevent the back flow of fluid and spring 67 is sufliciently strong to hold the valve to its seat and pre vent the leakage of fluid through ports 64 into the valve chambers so that during each outward stroke of piston 47, fluid is sucked from the intake chamber 54 through ports 60 and the corresponding bore 57 into the valve chamber.

The compression side of each diaphragm housing is provided at its highest point with a filler 70 which is closed by a suitable screw plug and through which the liquid may be introduced into the compression side of the housing and pipe connections 42'and these fillers are located at the highest point in order to allow the air to escape from said housing, thereby preventing the formation of air pockets. The pressure side of each housing has connected thereto at its highest point one end of a bypass pipe 71. Arranged in this pipe is a Valve 72 which controls the communication between the pressure sides of the housings so that the pressure therein may be equalized by opening said valve. This valve is automatically controlled by mechanism contained in box 74 shown in Figure 1, and this mechanism is operated by a pressure valve 74 which is (onnected by a pipe connection 74 to the outlet or pressure chamber 61 of housing 45 or in any othersuitable manner. The level of oil contained in casing 10 is maintained above the highest pointof housing 38, and easing 10 being connected with the pressure side of housings 38 by ports 37 the pressure sides of said housings will at all times be completely filled with oil. The closure plate 12 is apertured near the highest point of the casing and said casing is connected by pipes 75 with a vertically disposed pipe or riser 76, the upper end of which extends above said casing and receives a cap 76 The lower end of pipe 76 is connected by a short pipe 77 to closure plate 12 near the lowermost portion of casing 10, and a valve 78 is arranged in pipe 76 below pipe 77 by means of which the oil may be drained from casing 10 and pressure sides of housings38.

Box 74 is preferably filled with oil and a ill) pipe 79 connects said box to the upper por- 1 tion of pipe 76 and conducts the surplus oil from said box to casing 10 through pipe 76.

Where thecompressor is used in refrigerating systems, outlet pipe 62 is connected to a condensing coil 80 where the refrigerant is cooled and the lower end of this condensing coil is connected. to a sump 81. Leading from this sump is a pipe 82 which conveys the refrigerant to expansion coil 84 from which it is then returned by pipe 85 and pipe 59 to the intake chamber of valve housing 45. Sump 81 is connected by a pipe 86 to a pressure reducer 87 in which the oil is separated from the refrigerant and returned through pipe 88 and pipes 89 to the compression chambers 46. Pipes 89 are provided with suitable openings through which the oil may be introduced into the coinpression chambers and these openings, whei the latter are in o oration, are closed by In 89. Condensing coil 80 is preferably oca d between the electric motor 22 and the Compressor and surrounds pulleys 19 and 21, the coils of the condenser bemg spread for the accommodation of shaft and the motor shaft. Pulley 19 is provided with fan blades 19 and ulley 21 is provided with fan blades 21 w ich as the machine is operated cause air to circulate through said condensing coils.

In Figure 7 is shown an improved bearing for the condensershaft 15. 90 is a hearing which is fixed in tubular member 14.: A bearing'91 is arranged in the outer end of member 14 and the inner end of this bearing is -concaved to receive ball bearing 92. A bearin 94 having the concaved' end engaging ba 1 bearing 92 is spaced from bearing 90 and an expansion spring 95 is interposec between the two bearings and serves to hold bearing 94 in close engagement with hearing 92 and form an effective seal so as to prevent the oil from escaping along shaft 15.

Figures 13 and 14 show details of construction of the condensing coil, wherein means are provided for more readily .dissipating the heat. This means consists of a metallic screen 96 spirally introduced into the coil, thus increasing the surface of the. coil. A-wire member 97 is preferably secured to the screen throughout its length 57 and reinforces the same.

A compressor of my improved construction is noiseless in operation, is automatlc in its action, and can be easily installed.

, The dia hragm member being entirely submerged in liquid is not subjected to pressure but merely separates the liquids of the pressure chambers from the compression chambers so that should any refrigerant escape into the compression housing connections past the compression pistons, thediaphragm members will prevent the refrigerant from entering the casing.

The eccentric and the blocks form an efficient means for driving the pressure pistons and by virtue of the construction thereof the wearing of the operating parts is reduced to minimum. 4

WVhile I have shownxand described the preferred forms of my improved 'compressor, it is obvious that various changes in the size, shape or form in the construction and arrangement of various parts may be made and substituted for those hereindisclosed without departing from the spirit of my invention.

I claim:

1. A compressor comprising in combination a housing having a compression chamber provided with inlet and outlet connections, a pair of oppositely disposed interengaged compression pistons o erating in said chamber, a casing provide with pressure chambers connected with the respective ends of said compression chamber, a ressure piston operatlng in each pressure c am ber, a dia hragm member in each pressure chamber or sealing the communication between said compression chamber and corresponding pressure chamber and permitting transmission of fluid pressure therebetween to actuate said compression pistons, a sleeve fixedly arranged between said compression pistons and having its ends adapted to be engaged by the inner ends of said pistons, said sleeve being provided with ports for establishing communication between said inlet and outlet connections of said compres sion chamber, and a member extending through said sleeve and movable relative thereto and having its ends adapted to enter into cooperating relation with the ends of said sleeve and the inner ends of said compression pistons for controlling the passage of fluid through said sleeve.

2. A compressor comprising in combination a housing having a compression chamber provided with inlet and outlet connections, a pair of oppositely disposed interengaged compression pistons operating in said chamber, a' casing provided with pressure chambers connected with the respective ends of said compression chamber, a pressure piston operating in each pressure chamber, a diaphragm member in each pressure chamber for sealing the communication between said compression chamber and corresponding pressure chamber and permitting transmission of fluid pressure therebetween to actuate said compression pistons, a sleeve fixedly arranged between said compression pistons and having its ends adapted to be engaged by the inner ends of said pistons, said sleeve being provided with ports for establishing communication between said inlet and outlet connections of said compression chamber, a rod extending through said sleeve and fixed to said compression pistons, and a tubular member mounted on said rod and spaced from said sleeve, said tubular member being provided with enlarged ends adapted to close the respective ends of said sleeve during the compression stroke of the correspondingcompression piston, the ends of said sleeve of said tubular member being shaped to fit snugly within the inner end of the respective compression piston whereby the fluid admitted between the ends of said sleeve and said tubular member and the inner end of the corresponding compression piston is discharged by the movement of the latter under pressure through the outlet connections.

3. A compressor comprising in combination a housing having a compression chamber provided with inlet and outlet connections, a pair of oppositely disposed interengaged compression pistons operating in said chamber, a casing provided with pressure chambers connected with the respective ends of said compression chamber, a pressure piston operating in each pressure chamber, a diaphragm member in each pressure chamber for sealing the communication between said compression chamber and corresponding pressure chamber and permitting transmission of fluid pressure therebetween to actuate said compression pistons, a sleeve fixedly arranged between said compression pistons and having its ends adapted to be engaged by the inner ends of said pistons, said sleeve, being provided with ports for establishing communication between said inlet and outlet connections of said compressionmember, a rod extendingsion piston, the ends of said sleeve of said tubular member being shaped to fit snugly within the inner end of the respective compression piston whereby the fluid admitted between the ends of said sleeve and said tubular member and the inner end of the corresponding compression piston is discharged by the movement of the latter under pressure through the outlet connections, andcheck valves for closing said outlet connections during the intake stroke of the compression pistons.

4- In a compressor, compressing means comprising a compression chamber, a pair of spaced oppositely disposed pistons arranged therein, a rod extending between and secured to said pistons, a tubular member loosely mounted on said rod and movable longitudinally relative to said pistons, the inner ends of the'latter being provided with seats for receiving the enlarged ends of said tubular member, and a sleeve fixed in said chamber between said compression pistons, the bore of said sleeve being greater than the diameter of said tubular member to form an annular chamber for admitting fluid through said chamber into the space formed by the inner ends of said pistons and the corresponding ends of said tubular member and said sleeve, said sleeve being provided with seats adapted to receive the enlarged ends of said tubular member, thereby closing the communication through said tubular chamber, the ends of said sleeve being formed to-fit snugly within the inner ends of the respective. pistons so as to expel fluid under pressure therefrom.

5. In a compressor, compressing means comprising a chamber having inlet and outlet connections, a pair of spaced oppositely disposed pistons operating therein, a rod extubular member and the inner ends of said pistons, said sleeve being provided with an annular chamber communicating with said inlet connection and opening toward the ends of said pistons, said tubular member being spaced from said pistons and having lost motion connection therewith so as to close the respective end of said sleeve during the initial movement of the corresponding piston whereby the fluid admitted therebetween is trapped and forced under pressure therefrom through said outlet connection.

6. A compressor'co-mprising a housing having inlet and outlet connections and provided with a compression chamber, a pair of' oppositely disposed interengaged compression pistons operating therein, a casing provided with pressure chambers, a pair of pressure pistons operating therein, flexible means arranged in each pressure chamber for sealing the communication between the. corresponding chambers and adapted to permit the transmission of fluid pressure therebetween, a double-headed valve slidably arranged between said pistons and engageable by the inner ends thereof for closing the inlet port of said compression chamber, and pressure operated valves for controlling the outlet connection of said housing.

7. A compressor comprising a housing having inlet and outlet connections and pro vided with compression chambers, a pair of compression pistons operating therein, a casing provided with pressure chambers, a pair of pressure pistons operating therein, flexible means arranged in each pressure chamber for sealing the communication between the corresponding chambers and adapted to permit the transmission of fluid pressure therebetween, pressure operated valves for controlling the outlet connection of said housing, and valve mechanism arranged in said housing interposed between said compression pistons and cooperating therewith for controlling the inlet connection, said valve mechanism being operable by and in time relation with said compression pistons.

8. A compressor comprising a. housing provided with compression chambers, a pair of compression pistons operatingtherein, a Y

casing provided with pressure chambers, pressure pistons operating therein, means for connecting the pressure chambers with the of fluid between the respective c ambers and adapted to permit the transmission of fluid pressure therebetween, by-pass connections between the ressure chambers, and means controllin said by-pass connection and operable by the pressure created by said compression pistons.

10. A compressor comprising a casfng provided with pressure chambers, pressure istons operating therein, a support fixe to each piston, a roller arranged on each sup port to one side of the axis of said piston, a pair of oppositely disposed blocks having hearings on said rollers and provided with concave inner ends, and a driven eccentrfc arranged in said casing and having its peri he operatively engaging the inner ends blocks.

.11. A compressor comprising a casing provided 'with pressure chambers, pressure pistons operating in said chambers, blocks operatively mounted on the inner ends of said pistons, an eccentric revolubly arranged in said casin and in operative engagement with the mner ends of said; blocks, and means in said pistons for establishing communication between said casing and the respective pressure chambers when said p'istons occupy predetermined positions.

12. A compressor comprising a casing provided with pressure chambers, pressure pistons operating in said chambers, blocks rockingly mounted on the inner ends of said pistons, and an eccentric revolubly arranged in said casing and operatively engaging the inner ends of said blocks, said piston being provided with passageways whereby when the piston occupies a certain position a communication is established between said casing and the corresponding pressure chamber. 13. A compressor comprising a casing with oppositely disposed pressure chambers, pis tons operating therein, supports secured to the inner ends of said pistons, a pair of op positely disposed blocks, the outer ends of which have operative bearings in said supports, the bearing of each block being offset to one side thereof, an eccentric revolubly mounted in said casing and in operative engagement with the inner ends of said blocks,

diaphragm operatively arranged in each housing and dividin the latter intotwo compartments, one 0 which communicates with the corresponding pressure chamber,

compressing means, and pipe connections bctween the other diaphragm compartment and the respective end of said compressing means whereby when the fluid in the pressure chamber is placed under pressure the pressure is transmitted through said diaphragm and the fluid contained .in said pipe connection to said compressing means for actuating the latter.

15. A compressor comprising a casing provided with oppositely disposed pressure chambers, a sectional diaphragm housing connected to the outer end of'each chamber, a compression chamber, compresslng means arranged therein, said compressing means including a pair of spaced pistons, a fixed sleeve provided at its ends with o positely disposed seats, and a tubular mem 'er operatlvely mounted in said sleeve and cooperating with the mner endsof said pistons to trap the flllld therebetween and discharge it under pressure therefrom, pipe connections leading from each diaphragm housing to the corresponding end of the compression chamber, and a diaphragm secured in position between the sections of said housing for sealing the communication between the compression chamber and the respective ends of said pressure chamber and permitting the transmission of fluid pressure between said pressure chambers and said compression chamber.

16. A compressor comprising a casing provided with oppositely disposed pressure chambers, a sectional diaphragm housing connected to the outer end of each chamber, a compression chamber, compressing means aigranged therein, pipe connections leading from each diaphragm housing to the corresponding end of the compression chamber, and a iaphragm secured in position between the sections of said housing for sealing the communication between the compression chamber and the respective pressure chambers and permitting the transmission of fluid pressure between said pressure cham bers and said compression chamber, and means for equalizing the pressure between said pressure chambers.

17. A compressor comprising a casing provided with oppositely disposed pressure chambers, va sectional diaphragm housing connected to the outer end of each chamber, a compression chamber, compressing means arranged therein, pipe connections leading from each diaphragm housing to the corresponding end of the compression chamber,

and sand compression chamber, and by-pass connections between said casing and the pressure side of each diaphragm housing for maintaining the latter completely filled with fluid.

18. A compressor comprising a casing provided with oppositely disposed pressure chambers, a sectional diaphragm housing connected to the outer end of each chamber, a compression chamber, compressing means arranged therein, pipe connections leading from each diaphragm housing to the corresponding end of the compression chamher, a diaphragm secured in position between the sections of said housing for sealing the communication between the compression chamber and the respective pressure chambers and permitting the transmission of fluid pressure between said pressure chambers and said compression chamber, and passageways formed in each pressure, piston for permitting the passage of. fluid from the casing to the pressure sides of the diaphragm housing at appropriate times.

19. A compressor comprising a casing provided with fluid pressure chambers, pressure pistons operating therein, a housing provided with a compression chamber, pipe connections connecting the ressui'e chambers with respective ends 0 said compression chamber, compression pistons in said compression chamber and o erable by the fluid pressure created by sai pressure pistons, means for tying said pistons together, a tubular member having lost motion connection with said istons and cooperating with the inner en s thereof, and a sleeve valve fixed in said compression chamber cooperating with said compression pistons and said tubular member for controlling the communication between the inlet and outlet orts of the compression chamber.

20. na compressor, a housing provided with a compression chamber having inlet each of said stationary carried by t 1e i and outlet ports, a piston operatin in said chamber, and valve means arranged in said housing adapted to be simultaneously engaged with said valve seat and said piston for controlling the communication between said chamber and said ports.

21. In a compressor, a housing provided with a compression chamber havin inlet and outlet ports, a piston operating in said chamber, a stationary valve seat member in saidchamber, a one-way valve controlling the communication between the compression chamber and the outlet port, a stationary valve seat member in said compression chamber, and a valve having frictional operative engagement with said piston and cooperatin with said valve seat member and one,end oi? said piston for controlling the communication between the inlet port and the compression chamber. 22. In a compressor, a housing provided with compression chambers, a pair of oppositely disposed pistons operating in said chamber and connected together, stationary valve seat members arranged in said compression chamber, and a valve operatively mounted between said pistons and adapted to alternately seat itself in the respective valve seats and be engaged by the corresponding piston for com ressing and discharging the fluid from sai compression chambers.

23. In a compressor, a housin with aligned compression ChflIIfiRIS, fluid pressure operated pistons arranged in said chambers, stationary members arranged in said housmg between said pistons and spaced from each other to form an inlet chamber,

members being provided with centrally isposed' openings conprovidcd necting the inlet chamber with a corresponding chamber, a rod connecting said pistons, a sleeve slidably arranged on said rod and having its ends extending through the central openin in said members, and valves ends of said sleeve and adapted to be seated against said members and close the communication between said inlet chamber and the corresponding compression chambers.

In testimony whereof I hereunto aflix my signature this 30th day of January, 1923.

JOHN o. CARREY.

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