US1915800A - Rotary compressor - Google Patents

Description

June 27, 1933. J.R. PRICE ROTARY COMPRESSOR Filed March 27, 1950 INVENTOR @125 simplicity V Patented June 27, 1933 7' mm PATENT 'ZGEFFIC Z I ,JOH1 \1' :R. 'PBIGE;. OF.-GHARLOTTESVILLE, VIRGINIA ASSIGNOR .TO-M,CELROY-$HEPHERD:

' .eAisonAron-ms, IINQQBPORATED, 7 OF .CHARLOTTESVILLE, VIRGINIA, FA a, eon-201m- ROTARY comrnnsson Y Application rfiled March 27; 1930; Serial no. 439,318.

f+My present invention relates to'fluicl'pumps or compressors of'the rotary typeyandcontempl ates,*forfitsnovel'features,- the provi- V the outlet-port in the cover taken on theline 8 8,1 Fig. 6, looking in the direction of the '-si0n=- ofian improved;- structure I in this'r type YY ofopump,oncompressor, whereby pressure losses ure avoidecl with the consequent inc-reaseefi efficiency. e

A urtherad antagel1es 1n the plOVlslOll of me ansywher'ehy' the compressor or pump may be run at rhigh spee'cls ancl' cleliver' larger volmines of air or other fluid pumped at high pressures Were-given: period oftime; than has heretoliore j loeen *possible'.

' "A further advantage-lies in the means" ro; -1'v'icle'd,' whereby thebl2icles of the rotor are *held 1 i neontaet wdth 'th'e pump -body walls by the air pressures cl'e v elopecllloy: the run ning of the r-otor; low;thus doingdaway w'ith spr-ings, as cur- I further" advantage lies in the cletails of i the rctor' structure, whereby the foregoing" is accomplished, in the simplicity of the housing-structure; the porting thereofyan'd in the of other parts involved. These and othercapaljilitiesw i-ll be apprel'hen'dedas the herein -disclosure proceeds,- and 5 its-is obvious; that modifications may be made herein without departing from t the spirit 7 "thereof, =n0r-the scopeof the-appended'claims..

In the' clrawingi, V v

- Fi'gf1 'isa-"fr0nt end View inelevationeof ithe device,"lookingifrom right*toleft in -F-ig. 2, with the cover; shown in Fig. Q and FF-ig; 6, removeclfito show' the interior 3: assemw FigQ-EZ is a central sectional iew taken on the l ill-e 6f 1; .l g h direclion f arrows 1 Fig. 8 is a side -v1ew"i-n "elevation or: the

"rotoraand' blades, showing the latter in a :horizontal position; i Y i F-ig."- is':aifront:errcl View mainly in elevation gan'cl partly in section of the rotor and 2 :blades, looking ifromright i to; left in Fig. '3 :Figffi is a-Lperspective View of one of the iblacles; whichxare hereinafterrzmore fully' de- *scribed; V I

:Figs. 6 is et-n outsider front View of t e Cover vremoved; I 1

be the pressures high, or

' Fig 7 is aside view'thereof, looking from left i ht in -Fig. 6; 7 r

Fig. '8 is a fragmentary sectional View of arrows and H direction of the arrows r {The air compressor or' fluid' pump com 1 prises a substantially I cylindrical housing having an open flanged end, '\which is closed by'a' cover 2. The housing I hasa closed'en'd I '3, asshown in'Fig'LQ; u OnyWhich is -inte' grally therewithzmoui'itecl aneccentrically located,'-bored hub-"4 in which one-end ofa nection" with a *keye'd' driving "member, not

"shown.

' As shown in Fig.3, the rotor-'shaft fi'may 'The cover *2, as'at' 9, tofit a circular opening in the' finner by i a plurality; of circ umferentially locatecl screws 1'1,"'two -0f are shown in The cover ing 12, Figs; "2 and 7, the*closing' lid I3 of which is attachecl' by screws 14 theretoealso in-an-airtight manner;

a hardened and ground ball ring 17 ,1 between is provided withe manually closed' outwardly extendi h by means of an integral flan e 16a; Fig; '2, and hasfpressed thereon 9 :is'a similar View ofithe inlet port,' I taken on the l1-1'lO"9- 9, Fig.1'6, lookingkin the shaft- 5' ofar0tor 6, is 'rotatably mounted. The shaft-5 extends outwardly in one clirecgtlonfrom' the hub 4, and is slotted with 'afkfey yb f o a' riving'con l i is cylindrically shouldered, ishedface of the'flange10Fig;'2;and'-is ire-1 01 tothe rotor housing 1. in an air tight mane The housing 12 1s.bored=' to receive therei in a hardened and groundball ring l5, which 1 I e "is insetin' said'housing and held thereiri by-a which and the ring 15, are 'inserted aplu- .trality orbs-11s 18, thus to 'torm' a ball bearing for the shaft 16 of the rotor 6 in alinement with the eccentrically located hub 4 and shaft 5. r

The rotor 6, which is cylindrical and of a smaller diameter than the housing bore 19, is thus eccentrically located in said bore 19, as best illustrated in Fig. 1. The rotor 6 is further axially slotted across its full diameter thereof by a continuous blade slot 20, Figs. 1, 3 and 4, into which are mounted two closely fitted and ground blades 2122. Normally, these blades, 21 and 22 in their working positions, as shown in Fig. 1, are spaced apart a distance 23, forming a pressure chamber.

The rotor Ghas arranged therein a pair 1 of opposedly located air duets 2526, Figs.

1 and 4, these ducts being radially located forwardly of each blade 21 2 2, and the inner open ends 2728 of said ducts 25 26 enter the blade slot beyond the center of the rotor 6, this being best indicated, in Fig.

. 4, and thus cause the blades 2122 to be con stantly pressed outwardly, under air pressure, during the running of the pump, doing away with springs, and causing the blades ends to be engaged with thewall 19 of the pump,.in direct proportion to the pressure within the pump, during operation thereof,

which is an advantage. Also, the side thrust ing means for the blades is an important function, since a seal is thereby formed on opposite sides of the slot 20, that is to say between the boundary vtaces of the slot and the flat sides of the blades, to prevent escape of fluid along the said sides and through the chamber 23. This function eliminates retarding influences in the operation of the pump.

The outer ends of the ductsj25-26 are open at the periphery 29 of the rotor 6 and at their intermediate parts, as at 30-31, are controlled by ball valve means, comprising spring seats 3232, which. are formed each by an enlargement of an intermediate portion of the ducts 25-26, upon which seats are located compression springs 33-33, which hold check balls 3434 against bored ball valve plugs 3535, which are threaded ly mounted in enlarged outer portions of the ducts 25-26. As thus constructed, the ball valve assembly at each duct 25, 26, thus described,permits ingress-of compressed fluid to and behind the blade spaces 23, but prevents escape of said fluid therefrom.

To provide an entry into the blade slot 20 to cause the blades 2122 to be continually pressed against the sides of said slot during the operation of the rotor, the blades, as indicatedin the perspective view thereof, in F ig..5, .are provided each on'the side thereof with an air groove 36, which is of sufficient lengthto permit a full stroke of each of the blades 21, 22 during the rotation of the rotor 6; and said grooves, being located onthe when the rotor 6 rotates in thedirection of the arrows A, Figs. land 4, a suction is created in the space B, behind the blade 21, Whilst a fluid pressure is created in the space C in front of the blade 21. On the suction side the chamber B is constantly supplied with fluid, such as atmospheric air, through the inlet port 37 in the cover 2, Figs. 6 and 9, there being a 'coacting portionof. said port 37 ex tending into the housing 1, as at 38, Fig. 1.

This latter portion 38,-"is of only a slight V depth axially, whilst the cover2, Fig. 6, has

the greater portion of the inlet port 37 enclosed therein; this latter portion 37 is formed with an offset wall 39 contouring said inlet port 37,'as shown in Fig. 6, and has therein an opening 40 leading to atmosphere.

The fluid, which is compressed in the space C, isdischarged through a port 41 in the cover 2, as shown in Figs. 6 and 8; the dis charge port 41 extends as 42 into thebody of the housing 1, as shown in Fig. 1, and terminates in said cover 2 in a discharge duct 43, which is exteriorly threaded at the outer end thereof, as shown in Fig. 7, and embodies therein a valve seat 44, and cage 45', enclosing a check valve 46, as shown in dotted lines in Fig. 7.

I claim as my invention and desire to secure by Letters Patent: i

1. In a rotary fluid pump or compressor, a housing, a rotor eccentrically positioned therein to have relative rotation therewith, a slot extending entirely through said rotor, blades, slidably mounted in said slot, in contact with the inner periphery of said housing, a means for producing said relative rotation, thereby forming a fluid pressure space in said pump, and a duct in said rotor,

'2. In a rotary fluid pump or compressor a housing, a slotted member, eccentrically positioned therein, to have relative rotation therewith, blades, each having therein a sidegroove and slidably mounted in said slot, 1n contact with the inner periphery of said housing, a

means for producing said relative rotation, thereby producing a fluid pressure space and a suction space in said pump, a duct in a part of said member, to convey compressed fluid from said pressure space to the said grooves slot extending entirely through said rotor in one side of each ofvsaid blades, to press the same flatwise thereof against thesides of said slot in said member, and a means on'said. duct to check the escape of compressed fluid therethrough to the suction-space when said part is adjacent the latter during the said relative rotation.

3. In a rotary fluid pump or'compressor,

I a housing, a rotoreccentrically positioned therein, to have relative motiontherewith, a

blades, having each a side groove and slidably mounted in said slot, and in contact with the inner periphery of said housing, a means for producing said relative rotation, thereby producing a fluid pressure space and a suc-' tion space in said pump, a duct in a part of said relative rotation. i

said rotor, to conveycompressed fluidfrom said pressure space to sa d grooves 1n one side of each of said blades, to press the same flatwise thereof against the sides'of said slot in said member, and a check valve on said duct, to prevent the escape of compressed fluid therethrough to the suctionspace when said part is adjacent the latter during the 4. In a rotary fluid pump compressor,

a housing, a rotoreccentrically positioned therein, .to have relative rotation therewith,

a slot extending entirely through said rotor,- a pair of blades, having side grooves and slidably mounted in said slot, with'the outer end of each blade in contact 'With'lthe inner pe- I,

- riphery of said housing, a-means for produc- 1 ing said relative rotation, thereby forming a fluid pressure space in said pump, and a duct in said member, dlsposed to convey compressed fluid from a part of said space to the grooved side of eachiof' said blades, in said slot to press said blades flatwise thereof against the side of said slot in said member, thereby preventing leakage of compressed fluid therethrougl 5. In a rotary fluid pump or'co'mp ressor, a housing, a rotary member'eccentrically positioned therein, to have relative rotation thereto, a slot extending through said "rotor blades, slidably mounted in said slot-,and normally spaced onefrom the other but in contact with the inner periphery of said housing, thereby forminga fluid pressure space in said pump, a fluid pressure groove on one side of each of said blades and a duct insaidmember,

to convey compressedfluid tosaid space and to saidgrooves, to pressfeach of said blades flatwise thereof against the sides of said slot in said member, therebypreventing leakage of compressed fluid-therethrough.

'6. In a rotary fluid pump or compressor, a housing, a rotor having a cross slot there- "through, and eccentrically mounted to-rotate in said housing, blades having each a groove of for forming sidepressure chambers; said ,in one side thereof and extending-from the inner end longitudinally and centrally thereblades being separated in operation, to form' at their inner ends an axial pressure chamber in communication with said side pressure chambers {and means for driving said pump and for conveyingcompressed fluid to said pressure chambers for forcing the outerends of said blades into operative engagement with the inner walls of said housing-and for forcing the sides of said blades into sealing constant size andmovable laterally across the ax s of said rotor with the movement of said blades, said blades each having on one side a pressure groove communicating with the central pressure chamber whereby pressure received within said grooves-may force the bladesm'to sealing-engagement with the walls o f said groove, andvalvedports for,

conveying fluid under pressure to said pressurechamber, and means for driving saidf rotor.

dayof March, A. D1930. 1 I a Y I JOHN RPRICE.

Signed at, Charlottesville, in the-county of Albemarle and State of Virginia, this 25th

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