US971188A - Rotary pump or air-compressor. - Google Patents

Description

c. R. GEVTHER. ROTARY PUMP 0B. AIB. COMPRESSOR;

APPLICATION FILED JUNE 6. 1910. I 971,188. Patented Septh 27, 1910.

4 SHEETS-SHEET 1.

o. B.; GETHER. ROTARY PUMP 0B AIB GOMPRESSOB..-

' IIIIIIIIIIIIIIIIIII B 6. 1010f 97L188. v Patented sept 27,1910.

4 SHEETS-SHEET 2.

C. R. GETHER.

ROTARY PUMP 0B. AIR COMPRESSOR.

APPLICATION FILED JUNE 6, 1910.

Patented Sept. 27, 1910.

4 SHEETS-SHEET 3.

' c. R. GETHBR. i ROTARY PUMP OE AIR COMPRESSOR.

APPLIOATIOH FILED J' um: 6. M10- Patented v 4 SHEETS-BREST 4- UNITED, sTATEs PATENT OFFICE.

CHARLES n. oETHi-iia, or MILWAUKEE, WISCONSIN.

eri-,isa

To all 'whom 'it concern: Be it lknown that l, CHARLES R. GETHER, a

i citizen of the United States, residing at Miltwo revoluble pistons are so vconnected towaukee, county of Milwaukee, and State of Wisconsin, havey invented lnew and useful Improvements in Rotary' Pumps or Air- Compressors, of which the-following is' a specification. v i

Myv invention relates to improvements in" rotary pumps or air compressors, in which gether that they are ,caused to move alternately faster and sloweraiound a common center within an inclosing cylinder, whereby the fluid to be acted upon will he caused to enter the widening lspace between the oppoing sides of said pistons as they separate, while the iiuid which has previously entered betweenthe opposite sidesoof said pistons will be simultaneously discharged and my present improvement ertains more especially, amongy other things, to the peculiar construction and relative arrangement of the pistons, inlet and outlet ports and bypassesfrom being forced pastthe pistons from one of said ports to the other or from the outlet port to the space between the pistons as they begin to separate.-l l

It will be ui'iderstoodv that althou h the inlet port maybe sudicently open or the admission of tluidl when` thavtwo pistons first separate, soon-"after-ffs'uch Aistons separate said rpo`rt`- becomes partial yA closed'by the slower moving piston .lin front of the same, whereb r `the reei-` admission 'of vHuid is obstructed iorethe fast movin `piston has completed its= revolution, where y with this class of devices as heretofore constructed, the supplyf-'ofjuid is cut 0E oi" limited whereby a vpartialv vacuum is produced;- Also, that as the main outlet ort is not suficientl tobe discharged freelyatthe beginning oi the accelerated' movement of .the rapidly moving piston, especallyggawhen pumping liquids, aconcussionor -`tratti',hanriinrier is.

producedas such rapidly '-'inqving piston ap-r wide open to allow t e liquid or air Specicatioii'offLetters Patent.

Application led Jun'e 6, 1910. Serial No. 565,182.

ROTARY Pinar `on ainfcoiuranss'on. I

Patented sept. '27, i910.

concussion is liable to wreck or damage the Also, that when compressing air machine. or other elastic fluids, by reason of the narrow space between the outlet port and the point of` separation of the pistons the leaka e from the outlet port has a tendency to re ll the space between said pistons, eX- pand, and either escape through the inlet port o r remain where it is and be again and repeatedl compressed.

One o the primary objects therefore of my present improvement is to provide branch ports or b passes, which are so located that when t ye primary ports are partially or wholly closed by the moving pistons, the Huid will be free to temporarily enter and escape through such branch ports whereby. the pump or air compressor wili operate smoothly, easily and with the highest eiciency, and the danger from concussion or water hammer heretofore experienced in machines of this class is entirelyv overcome.

My invention `isexplained by reference to the accompanying drawings, in which- Figure i is a side view, part in section.A

Fig. 2 is an end view. Fig. 3 is a transverse section, drawn on line `:zzof Fig. 1. Fig. 4 is a longitudinal section of the pistons. Fig. 5 is a perspective view of one of the pistons. Fig-6 is a Side View of one end of the cylinder with a portion ofthe covers of the orts Vand icy-passes removed, the position o the pistons being, indicated by dotted lines. Fi s. 7 t0 14 are diagrammatic views of the cy inderypistons, ports and by-passes, show-v ing the relative-position of the pistons to 'each other and said ports and by-passes during one complete revolution of one of said pistons.

`erence numerals .throughout the several views. 1 isiaf driving shaft which is adapted to be driven bya pulley` 2, or in any other convenient manner.

Af and B fare pistons of similar construc- I tion. The piston 'A is rigidly connected to the shaft 5and the piston B is connected in like'manner to the shaft 6, and. said pistons are centrall su ported in alinement. with Seach otherl (y t e .trunnion 7. Motion is communicate from the shaft l to the piston inerhbe'ri through the' dierential gears 8 and 9 and shaft lwhile a similar movementproaches the slowly moving, piston, which i is simultaneously, communicated to the -pis- 4Lik partsaieidentified by the same refl ton member B from the shaft 1 through the differential gears 10 and 11 and shaft 6.

The relative arrangement of the two sets of differential gears 8 and 9 and 10 and 11 to each other is such, that while the shaft 1 moves at a uniform speed, the respective shafts and 6 and piston members A and B move alternately faster and slower, one of said piston members moving slowly and making` a small part of a revolution only, while the other performs a complete revolution, whereby the fluid between the front side 'of the rapidly moving pist-on member and the rear side of the slowly moving piston member is forced out as the rapidly moving piston approaches the other, while a partial vacuum is simultaneously formed between the rear side ofthe rapidly moving piston and the front side of the slowly moving piston, whereby air lor water is caused to flow into the space between such pistons preparatory to being forced out as soon as the relative speed of said piston members is reversed. Thus the fluid acted upon is continuously7 being drawn into the space upon one side of said pistons, while it is simultaneously forced from the space upon the opposing sides of said pistons. The pistons and their supporting shafts are inclosed by the cylinder 15, and the respective ends of the cylinder are closed by the end members 16, 16, which members serve as cylinder heads, as supports for the respective ends of the shaft 1 and as bearings for the ends of the shafts 5 and 6.

29 is a support for one end of shafts 1 and 5 and 'together with the trunnion 7 serves t0 keep said shafts 5 and 6 in alinement with each other.

2O is an inlet port'through which uid is led to the cylinder preparatory to being acted upon by the pistons.

21 is an outlet port through which the fluid is forced from the c linder.

1While the respective in et and outlet ports may be formed in the cylinder heads, they are preferably formed in the cylinder 15 and are adapted to be alternately opened and closed by the revolving pistons as they pass in front of them.

In view of the fact that the inlet port 20 is partially closed by the slowly moving piston A before it is overtaken by the fast movmg piston B, (see Fig. 3'), it becomes necessary in order to admit a full supply of fluid into the space C to provide an auxiliary inlet port or by pass 22, whereby Huid is free to enter the space C after the piston A has entirely closed said port 20. The by pass 22 is provided with an inward openingcheck valve 28, which is closed by the fluid pressure within the space C or by other means and prevents the escape of uid from such space before the piston A has passed the inlet end of said by pass.l In

view also of the fact that the outlet port 21 is nearly closed by the piston A at the beginning of the accelerated movement of the piston B, l have provided an auxiliary port or by pass 24, whereby the fluid in the space D is free to escape through said by pass into the port 21 until said port 21 is more widely opened by the passage of the slowly moving piston A. 25 is an outward opening check valve which serves to prevent fluid which has been driven out through the port 21 by the piston B from returning to the cylinder through the by pass 24. In view ofthe fact that the piston A will have passed the port 21'and that said port will be closed by the piston B before said pistons come together, a small quantity of fluid would, unless otherwise provided for, remain trapped between said pistons after said port 21 is closed. It therefore follows that unless such trapped fluid is released, it will, when a liquid, cause a concussion or so called water hammer, which is liable to break the pump and injuriously affect its working. Also that in case air is being compressed, such trapped air will be repeatedly acted upon and permitted to expand without escaping from the cylinder. In view of these facts, have provided an auxiliary port 26, which is connected with the port 21 by the by pass 27, (see Fig. 6), and said port 26 is so located in advance of and overlapping the port 21 that such fluid as would otherwise become trapped in the space between said pistons A and B will be free to pass out through said port and by-pass to t-he port 21, whereby the concussion and noise is prevented and the machine is caused to move' smoothly and with the highest e'fiency. This port is provided' with an outward o ening cheek valve 28 which prevents the u id from rentering the space between the pistons from which it has been expelled. l

Referring briefly to the iagrammatic views shown in Figs. 7to 14, Fig. 7 shows the relative position of the pistons A and B to the ports and by-passes at the be inning of the accelerated movement of the p1ston B, the inlet port 20 and the outlet port 2l being closed by the pistons A and B, while the fluid in front of B passes out through the by-pass 24 and a partial vacuum is formed in the space C between the pistons A and B. Figs. 8 and 9 show the relative position of the pistons as the inlet port 20 is opened, while the fluid is being forced out both through the port 21 and by-pass 24 and admitted through the port 20. F ig. 10 shows the relative position of the pistons after both inlet and outlet ports are partially open and both by passes 22 and 24 are also opened. Figs. 11 and 12 show the relative position of the pistons to each other and the ports after the piston B has closed the by pass 24. Fig. 13 shows the relative position of the pistons to each other after the outlet port 21 is closed entirely at which point the fluid which becomes .trapped between said pistons, passes out through the port 26, and thence back to the port 21 through the by pass 27 until both istons come close together as shown in ig. 14, while Fig. 14 shows the position of the piston A when and after it has been overtaken by t-he piston B, and until the pistons again begin t-o separate at which point the relative position of said pistons is completely reversed. As soon as the piston B has thus completed its revolution and overtaken the piston A, the speed of the piston A will in like manner be accelerated until it overtakes the piston B and the `movement t-hus describedwill be continuously repeated;

lt will be understood that by thus using the several auxiliary ports and by passes, I am enabled to make the main ports 20 and 21 comparatively narrow vwithout restricting or interfering with the free passage of fluid to and from the cylinder andthat by thus making such ports comparatively narrow, a larger surface area is provided between said ports than it would be possible to provide with larger ports, whereby there is less danger than there might otherwise be of the fluid, which is under pressure, from escaping from one port to the 'other past said pistons or from the outlet port to the openinflr space between the pistons. For

example, if the port 21 were to be increased in width to correspond with the width of the auxiliary port 26 and port 21 combined f( as'inight otherwise be required to prevent the trapping of fluid between said pistons l as they come together) Ithere would not rc-` main enough surface area between the 'inlet and outlet ports to'prevent the escape. -of fluid from one port to the other or from the outlet port to the opening space between the pistons, while by forming the auxiliary ports and by asses and providing the same with check va ves as shown, l am enabled as stated to locate said main ports ata 'sufficient distance apart to prevent such escape of fluid and the loss of thereto.

While my device is adapted to. be used both as an-air compressor and as a liquid pump for brevity of description it is hereinafter referred to in the claims as a pump.

Having thus described my invention, what l claim as new, and desire to secure by Letters Patent, is v 1. ln a pump, the combination with a cylinder, of two pistons extending from its axis to its circumference and from end to end and having substantially equal circumferential Width mounted therein, and adapted to rotate about said axis, means foi` continuously rotating the pistons in the same direction lat alternatelyl faster and slower power incident speeds so that each shall move faster while the other 'moves slower, with such am litudes of the movements of eachv kind t at adjacent faces of the pistons will alternately approach each other until they are close together and recede from each other until the of the pistons at practically the beginning Y of the receding movement and constantly closed to the approaching faces and the outlet port is opened between the a preaching faces of the pistonscuntil the en of the approaching movement and is constantly closed to the receding faces, the ports being separated by a considerable spaceon the interior surface of the cylindery which is covered by` the pistons when they come close together.

2. In a pump," the combination with a cylinder, of two istons extendin/g from its axis to its circum erence, and' fromnend to end and having substantially equal circumferential width mounted therein, and adapted to rotate about said axis, means for continuously rotating the pistons in the same direc tion at alternately faster and slower speeds' so that each shall move faster while the other moves slower, with such amplitudes of the movements of e `h kind that adjacent faces of the istons y'will alternately approach each ot er until they are close together and recede from each other until'the opposite faces are close together, inlet and outlet orts communicating-with said cylinder a apted to be alternatelyT-opened and closed by said pistons asthe'latter revolve in front of them, .anadditional outletport :located at a point slightly Ifin advance of and overlapping said main-I outlet port at and before the 'unctional'pointgpf said pistons, a check valve located in said''port and a b pass leading from said advanced port bac to said main outletl ort adapted to permit between said pistons to escape after said main outletport is closed by the fast moving pist/0n. y v l 3. In a pump, the combination with a cylinder, of two pistons extending from its axis to its circumference and from end to end and havingsubstantially equalV circumferential width mounted therein, and adapted to rotate about said axis, means for continuously rotating the pistons in thesame direction at alternately faster and slower speeds so that eachshall move faster while the other moves slower with such amplitudes of the movements o each kind that adjacent faces the fluid which wou d otherwise be trapped of the pistons will alternately approach each other until they are close together and recede from each other` until the opposite faces are close together, an auxiliary inlet port adapted to admit fluid between said pistons after the main inlet port is partially closed by the slowly moving piston and a check valve located in said auxiliary inlet port.

4. In a pump, the combination with a cylinder, of two pistons extending from itsv axis to its circumference and from end to end and having substantially equal circumferential width mounted therein, and adapted to rotate about said axis, means for ,continuously rotating the pistons in the same direction at alternately faster and slower speeds so that each shall move faster While the other moves slower, with such amplitudes ofthe movements of each kind that adjacent faces of the pistons will alternately approach each other until they are close together and recede from each other until the opposite faces are close together, an outlet port and by pass adapted to permit of the escape of fluid from between said pistons before the main outlet port has been fully opened by the passage of the slowly moving piston and a check valve adapted to close said Voutlet port.

In a pump, the combination with a cylinder, of two pistons extending from its axis to its circumference and from end to end and having substantially equal circum` ferential widthv mounted therein, and adapted to rotate about said axis, means-for continuously rotating the pistons .in the same direction at alternately faster and slower l speeds so that each shall move faster while theother moves slower, with such amplitudes of the movements of each kind that adjacent faces ofthe pistons will alternately approach each other until they are close together and recede from each other until the opposite faces are 'close together, inlet and outlet ports communicating with said cylinder adapted to be alternately opened and-closed by said pistons as the latter revolve in front of them, an auxiliary inletport, a check valve located in said inlet port adapted to admit fluid lbetween said pistons after the main inlet port is practically closed by the slowly moving piston, an outlet port and by pass, a check valve located in said` l outlet port adapted to permit ofthe escape of fluid before the main outlet port is fully opened, and an additional outlet port located ata point slightly in advance of and overlapping said main outlet port at and just before the junctional point of said pistons a check valve located in said additional port and a by pass leading from said additional port back to said ma1n outlet port and adapted -to permit the fluid which is trapped between said pistons to escape after of said driving shaft and one of said piston l supporting shafts, the other end member being adapted to support the other end of said driving shaft and together with the trunnion to support the other piston supporting shaft whereby said pistons and piston supporting shafts are supported and retained in alinement with each-other.

In testimony whereof I 'afx my signature in the presence' of two witnesses.

. CHARLES R. GETHER. Witnesses:

JAS. B. ERWIN,

R. L. FARRING'ION.

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