US2515033A

US2515033A - Reciprocating pump and compressor

Info

Publication number: US2515033A
Application number: US163813A
Authority: US
Inventors: Connor Arthur Albert
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-05-25
Filing date: 1950-05-24
Publication date: 1950-07-11
Anticipated expiration: 1967-07-11

Description

A. A. CONNOR 2,515,033

July 11, 1950 Filed May 24. 1950 INVENTOR ARTHQR A. CONNOR ATTORNEYS A. A. CONNOR RECIPROCATING PUMP AND COMPRESSOR July 11, 1950 5 Sheets-Sheet 2 Filed May 24, 1950' INVENTOR ARTHUR A. CONNOR W ATTORNEYS July 11, 1950 A. A. CONNOR RECIPROCATING PUMP AND COMPRESSOR 5 Sheets-Sheet 5 Filed May 24, 1950 INVENTOR ARTHUR A. CONNOR [lg/1% 4 ATTZQNE July 11, 1950 A. A. CONNOR 2,515,033

RECIPROCATING PUMP AND COMPRESSOR Filed May 24, 1950 5 Sheets-Sheet 4 INVENTOR ARTHUR A. CONNOR Maw ATTORNEYS July 11, 1950 A. A. CONNOR 1 2,515,033

REC'IPROCATING PUMP AND COMPRESSOR Filed May 24, 1950 5 Sheets-Sheet 5 INVENTOR ATTORNEYS ARTHUR A CONNOR Patented July 11, 1950 2,515,033 RECIPROCA-T-ING PUMP AND COMPRESSOR Arthur'Albert Connor, Hove, Eng and Application May-24, 1950, Serial No. 163,813 ln fireat Britain May 2-5, 1948' 2 l i s- This invention relatesto reciprocating pumps and compressors for the delivery, pressurising pr suction of liquids .or .gases, of the kind compris ing a'rotatable cylinder block having. a plurality of radial cylinder bores each housing a piston whichv is reciprocated therein by slidablyengaging a guide member disposed .eccentrically to the axis of. rotation of the block. and rotated by the frictional engagement .of the pistons.

The object of the present invention is topmvide asimplified construction of uch a, pump.

According. to the .present invention,..the pump comprises a cylindrical casing, one end of which is detachable and carries a fixed valve shaft .on which the cylinder block rotates, and the 'pther end of which carries a fixed stub shaft, eccentrically disposed with respect to the said valve shaft, and on which a cup-shaped guide is rotatably carried, said stub-shaft also serving .as a bearing for adriving shaft coupled to the cylinder block.

The pistons engage with the guide member .or the like on the inner periphery thereof :by centrifugal force when the pump is running.

The valve shaft has axial passages which communicate at their inner end with the cylinder bores, the cylinder block and valve shaft together forming a rotary valve.

In .asimple embodiment of the invention, the shaft comprises two bores passing inwardly from its external end parallel with each other and with the axis of the shaft and communicating each with a slot cut in the periphery of the end of the valve shaft inside the casing, the two slots being diametrically opposed.

The external ends of the two holes in the shaft form the inlet and outlet ports of the pump, and the'slots in the shaft coact with passages in the cylinder block leading to the bores therein.

The guide member is a cup shaped annulus, having its internal diameter greater than the outside diameter of the cylinder block, and rotatable on the stub shaft fast to the end of the casing. The internal circumference of the cupshaped guide member encloses the pistons in the cylinder block and serves to retain them therein. The stub shaft on which the cup shaped member is mounted is pierced by an eccentric axial hole through which hole passes the driving shaft.

The slots in the valve haft are so arranged as to allow fluid to .be drawn through one part thereof and into the bores of the cylinder block by the outward displacement of the'corresponding pistonduringthenrsthalf .of a cycle, and

The valve shaft ca ry n t e cyl nde b ock may he provided with .a suitable lubr tion channel or cha n l to perm t the f ow .Q -e l to the b arin surface between the nde blocs and the said shaftvAs on o t valve l ts ou in "the said shaft is for the intake side of the pump the pressure v at'or near said slot .is reduced. Furthermore, thecasing, in which th cylinderiblock-revolves. is sea d or sub antiall sealedyth e w ll he a pre sure bu up insid it due to leakage past the pistons. When the ylinderlolock revo v s at hi h spe d. a yoil present is flung to the periphery of the casing inside and a suitable outlet can ,beprovided to ap .offsome of this oil at this-po n II" a c nction is made between the tappin point and the above mentioned lubrication channel where provided, the difference in pressure ,-is considerable and can provide an adequate ;fiow o f oil from the casingtothe cylinder block bearing, thereby reatly increasin the .effiei ncyof th pump and providing anautoma i l brication and coolin means. -for the hearing.

The rotation ;of the guide'member permits a very-small relative rotation between-the pistons and :the said guide member, whereby frictional losses are greatly reduced, and :the pump is very quiet. in; operation.

in order thatthe invention may be more fully understood, a construction thereof is shown: by wayof example in the accompanying drawings, wherein:.

. Fig.- 1 shows .a central verti'cal section th'rough apump.

Fig. '2 shows a section taken-on the line I--I of Fig. 1.

Fig.6 shows a front elevation with one-end-of the casing and the cylinder block removed, looking into the casing.

Fig. 4 shows an elevation of;the removable-end of the casing and the cylinderblock.

Fig. 5 shows 'acentral --horiz on ta1 section through part of theend of 'the'casing-a-nd'valve shaft.

Fig. 6 shows a side elevationofthe cylinder block-with one of the pistons thereof removed to show valve passages. I

Fig; '7 shows atypical piston;

Fig.8 shows a central vertical section through a modification .of the pump.

Fig. 9 shows a plan view of a detail of the modification of Fig. 8.

Fig. 10 shows a plan View of another detail of the modification of Fig. 8. t

Fig. 11 shows an elevation of yet another detail of the modification of Fig. 8.

In these figures, I represents a casing having a removable end 2 and support legs 3. A stubshaft 4 is rigidly attached centrally on the inside of the end wall of the casing I by means of screws 5 (only one of which can be seen in Fig. 1). 6 is a cup-shaped annular guide which is rotatably carried on the stub shaft 4. ,A driving shaft I passes rotatably through a bore in the stub shaft 4 offset from its axis andhas on its inner end an inner coupling member "8 which also serves to retain the guide -6 on its' shaft.

The inner coupling member 8 coacts with an tion thereof in the valve shaft 29. 4| are oil outlets in the valve shaft for passage of oil to the bearing surface between the valve shaft and the cylinder block. The air pumped by the device emerges through the union 42 and passes through a pipe 43 and a union 44 to a hollow handle 45 which at its lower end has a stop-cock 46 controlling the flow through a bore 41 leading to a spring loaded'relief valve 48 controlling the flow to a bore 49 which leads back into the interior of the casing through the end wall of part 21.

Q The qperationis as follows:

Whenthe pump is working, and a quantity of oil has been previously introduced generally into by the impeller and is flung radially outwards.

intermediate coupling member 9 loosely engaged therewith, which latter in turn coacts by means of tenons H) with slots l l provided inafiange 12 on a cylinder block- 13, insuch a manner that rotation of the driving shaft 1 causes rotation of the cylinder block l3. The block- I3 is r0- tatably mounted on a valve shaft l4--which-is rigidly set in the removable end 2 of the casing. At the centre of the cylinder block-l3 is arranged a Phosphor bronze or like bearing ring I3*. 15 represents four equally spaced radial cylinder ibores each receiving a solid piston 16 and hav i ing at their inner -end two valve passages I1 spaced axially-of the cylinder block. These are arranged to coactwith valveslots [8 in such a manner as toform a rotary valve whenthe cylinder block I3 is rotated with respect to the valve shaft 14. *Each valve slot leads by means of an axial bore [9 to the outer surface of the end 2 of the casing. One such bore IQ for the output of the pumplthe lower one-in Fig. 5) has a widened portion 20 at its outer end to receive a screw threaded union 2l- (shown only in Fig. 5) which isalso adapted to retainin position a cover plate 22 (in Fig. 5.) serving to compress a felt or like washer 23 (in Fig. 5) against the end2 of the casing in such a manner as to form a filter for the-upper bore I=9 in Fig. 5. Said filter also serves as a silencer for the air intake. The pistons [6 have peripheral grooves 24 whichassist in retaining lubricant-in the bores andserve'to provide a more effective seal between the bores and the pistons. The-l ends of the pistons It are roundedaszat 25'. to enable them to coactwith the inside periphery of the guide 6 with a minimum of friction in all their relative positions. 26 Ban oil filler plug which can be screw threaded into a filler'aperav ture at the upper part of the body of .thecasing and which can carry a dipstick (not shownlafor ascertaining the levelof the lubricating oil.

Figs 8 and 9 show a modification in which.lubrication of the valve shaft is improved 'by'the provision of a forced oil feed. In this figure, a casing for the pump has two parts 21 and 28, part .21 carrying a valve shaft 29 on which is rotatably mounted a cylinder block 30 having pistons 3| in cylinder bores 32. Part 28 carries a stub shaft 33 on which is rotatably mounted a cup-shaped guide 34 coacting with the pistons 3|. 35 is a driving shaft which is coupled to the cylinder block 30by a'coupling member 36-. A disc 31 rotatively coupled to the end of-the driving shaft 35 has a pluralityof cups or. depressed portions 38 and serves" asan oil. 'irnpelleia' 39 is an oil feed channellin thepart .21; and is another oil feed channel forming a continua- Some of it passes into the open upper end of the oil channel 39 and passes down the said channel to the channel 40 in the valve shaft.

For the purpose of ensuring: that oilwill :pass' lets 4| to the adjacent bearing surfaces; .Any'

oil which gets fed out with the'compressed air passes through the 'pipe 43 to the handle :45-and runs downwardly thereinto the stop-cock 46 and from there can flow back through the adjustable spring-loaded relief valvef48to the;bore 49, and is thereby returned to the inside of the :casing.

The path of the lubrication oil is. indicatedby the arrows. I

Fig. 10 is a plan view of part '28 of the casing and shows (in broken line) a baiile-BU arranged on; the inside upper wallof the casing neara filling hole 5| to prevent'oil escaping.through'saidfilling hole. :"i

Fig. 11 is an elevation of part 28 of the casing seen from the outside of the pump to-showthe the hollow handle, and a'relief valve in th'e'casing' connected by bores to 'thejstop c ock and the inside of the casing, whereby oil carried out through the outlet union is collected in thefhollov'v handle and returned through the st'op-cocli-a'n'd relief valve to the inside oi-thecasing' a rotary cylinder block rotatably' carried on tne'sa'i valve shaft and forming a rotary valvetherewith. a plurality of radial cylinder bores infthe cylinder block, a piston in each saidl bora a stub-shaft fixedly mounted on thelother end for the casing ecce'n trically withrespecuto the said valve shaft, a cup-shaped guide rotatably carried bysaid stub shaft and driven by slidable engageinentwith the outer ends of the pistons a driving shaft'for the cylinder block carried in an eccentric bore in the said stub-shaft; and coupling means between saiddriving shaft and the cylinder block, whereby when the cylinderblock is rotatedby the driving shaft the pistonsin said blockp'are' urgedloute wardly by centrifugalforce .to slidablyengage the pped u d gan i ar i her v,reci qc e 1 e. i g r., pre- I 1 A. pump comprising a casing having 5 lindricai portion and two ends one or which is detachable, a valve shaft fixedly mounted on said detachable end and having an outlet union, a hollow handle mounted on the casing and in communication with the outlet union, a stop-cock in the hollow handle, and a relief valve in the casing connected by bores to the stop-cock and the inside of the casing, whereby oil carried out through the outlet union is collected in the hollow handle and returned through the stop-cock and relief valve to the inside of the casing, axial passages and axially-separated slots in the valve shaft, a rotary cylinder block rotatably carried on the valve shaft, valve passages in the cylinder block whereby the cylinder block forms a rotary valve with the valve shaft, a plurality of radial cylinder bores in the cylinder block, a piston in each said bore, a stub-shaft fixedly mounted on the other end for the casing eccentrically with respect to the valve shaft, a cup-shaped guide rotatably carried by said stub-shaft and driven by slidable engagement with the outer ends of the pistons, a driving shaft for the cylinder block carried in an eccentric bore in the stub-shaft, a loose couplin member for the driving shaft and the cylinder block, a slotted circular flange on the cylinder block, and tenons on the coupling member to engage in the slots of the flange, the pistons in theg cylinder block being urged outwardly by centrif-ugal force when the cylinder block is rotated and being reciprocated by slidable engagement with the cup-shaped guide.

ARTHUR ALBERT CONNOR.

REFERENCES CITED ,The following references are of record in the file of this patent: