US1032342A - Rotary pump. - Google Patents

Description

E. MORELL.

ROTARY PUMP.

APPLICATION FILED APR. 9, 1910.

Patented July 9, 1912.

2 SHEETS-SHEET 1 I ZVII/ Y 1 I? y 4 wit case-o 1.. MORBLL.

ROTARY PUMP.

APPLICATION FILED APR. 9, 1910.

Patented July 9, 1912.

Z SHEETS-SHEET 2 Witnesses I 7 Afto r'n ey COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

ROTARY PUMP.

To all whom it may concern:

Be it known that I, ERNST l\I()Rl 1LL, a sub ject of the German Emperor, and residing at Cassel, Germany, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

The present invention relates to improvements in rotary pumps, and more especially in pumps wherein the rotation of the piston is designed to compress a charge of air drawn into the casing, and to subsequently expel the same through the outlet passage leading to the storage tank, the invention residing primarily in the particular construction of the piston and of its associated pressure wings, and in the specific construction and arrangement of the packing members employed in conjunction with said piston and wings.

A structural embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is a transverse vertical sectional view of the improved pump, Fig. 2 is a vertical section taken on the line 22 of Fig. 1, Figs. 3 and 4 are side and end elevations on a reduced scale of one of the piston halves, Fig. 5 is a side elevation of one of the members for packing the ends of the piston halves, Fig. 6 is an enlarged fragmental sectional view illustrating the 1nan' nor of operation of the blades with which the pressure wings are provided, Fig. 7 is a detail plan view of the packing member located at the top of the casing, Fig. 8 is a detail view, partly in section and partly in elevation, of the pressure wings and the ring connecting the same, Fig. 9 is a fragmental sectional view illustrating the action of the packing member shown in Fig. 7, Fig. 10 is a perspective view of one of the packing strips carried by the piston, Fig. 11 is a perspective view of one of the members for packing the side faces of the pressure wings.

In said drawings, A designates generally the casing of the pump, B the rotary piston, C the pressure member carried by the latter, and D the valve mechanism.

The casing A comprises a central cylindrical body portion 1, and cover plates 2 and 3, the several parts just specified being bolted or otherwise connected together. One of the plates, in the present instance the plate 2, is formed with a bearing for the station- Specification of Letters Patent.

Application filed April 9, 1910.

Patented Julyfl, 1912.

Serial No. 554,374.

ary crank shaft 4, while the other plate 3 is provided wit-h a bearing for the drive shaft 5, which latter has its inner terminal reduced and threaded as at 6, and its outer termlnal formed with a feather 7, the last mentioned terminal constituting a seat for a pulley or other driving element, (not shown), to which power may be transmitted from any suitable source. The crank shaft 4 may be advantageously held in position by a clamp nut S fitted on its threaded outer terminal 9 and adapted to be tightened Gaskets 10 are preferably interposed betweem the confrontmg edges of the casing body? against the adjacent face of plate 2.

and the cover plates.

Piston B is located within the interior of the casing and comprises a central cylindrical body portion 11 arranged eccentrically with respect to the casing body, and projecting end portions or trunnions 12 and 18, the latter trunnion having an axial bore 14 which opens into the chamber 15 in the body portion 11. The trunnion 12 is formed with a threaded axial recess wherein the threaded terminal 6 of the drive shaft 5, is seated. The said piston is formed by two counterpart members or halves, one of which is illustrated in Figs. 3 and 4, and is supported by pairs of inner and outer rings 16 and 17, between which series of anti-friction bearings 18 are interposed. The outer rings 17 fit in the concave portions of the cover plates and are thus supported, while the inner rings 16 fit in the trunnions 12 and 13, said trunnions being formed with inclined or beveled circumferential portions 19 which coact with the correspondingly beveled inner faces of said rings 16. To hold rings 16 in place, and to close the piston halves tightly against each other, the terminals 20 of the trunnions are threaded, and carry collars 21 which are designed to be screwed up against saidrings, thereby causing the same to tighten on the beveled portions 19, as will be understood.

The crank shaft 4 projects through the bore 14 of the trunnions 13, and its terminal crank 22 carries a roller 23 which fits within the elongated yoke 24 that connects the two diametrically opposite wings 25 of the pressure member C, said wings projecting outwardly through slots in the piston produced by the mating cutaway portions 26 of the piston halves. (See Fig. 3). The

width of these wings is considerably greater than that of the connecting yoke. In the end of each wing there is formed a series of spaced parallel slots 27 extending inwardly thereof and adapted to receive the sliding blades 28, each series of slots opening into a transverse passage 29 which, at its outer end, communicates with a passage or cavity 30 formed in that portion of the piston body 11, which is directly adjacent thereto. These blades serve to pack the wing ends during rotation of the piston. To pack said wings at the sides thereof, the plates 31 shown in Fig. 11 are provided, which plates are of a grid-like character and comprise inner and outer series of spaced parallel ribs 32 and 33 arranged at right angles to each other and fitting, respectively in series of spaced parallel grooves 34 and'35 formed in the side faces of the wings, as shown in Fig. 10, thefirst series of grooves being arranged transversely of said faces, while the second series are arranged longitudinally and open at their outer ends into the ends of slots 27. At their inner ends, the longitudinal grooves 35 are intersected by cross grooves 36 which receive short packing strips 37.

To pack the end faces of the piston there are provided annular members each composed of counterpart halv es. 3li,l one of which is illustrated iii These half rings rest upon the inner ends of the trunnions 12 and 13 and each is formed with a series of radial slots 39 that intersect the series of concentric arcuate ribs 40 provided upon the inner faces of said half rings, said slots being adapted to register with similar slots 41 formed in the ends of the body portions of the piston halves. The slots 39 and 41 receive U-shaped packing strips 42 whose legs are formed intermediate their ends with pairs of oppositely projecting locking keys 43 that fit in branches 44 of the slots 39. (See Figs. 5 and 10). The arcuate ribs 40 above referred to, are received in correspondingly shaped seats 45 formed in the face thereof at opposite sides.

47 is receivable in a recess 49 formed in the end faces of the piston halves.

The piston body is disposed eccentrically within the hollow body portion of the casing, as originally stated, and its peripheral sur face is adapted to contact with the inner peripheral surface of said portion at the topmost point thereof, as will be seen from Figs. 1 and 2. It becomes necessary, therefore, to provide packing at that point to produce an air-tight joint, and to this end the packing member 46 shown in Fig. 7 is preferably provided. Said member 46 comprises a body 47 of packing material, and series of resilient arms 48 projecting from the lower The body casing body 1, the upper wall of this recess being formed with alternate ribs and grooves 50 and 51, arranged in parallel relation and adapted to respectively coact with the alternating grooves and ribs 52 and 53 with which the top face of said body 47 is provided, the arrangement being such that the contact of the piston with member 46 during its rotation will cause the body 47 to seat snugly in its recess, and the arms 48 to seat in like manner in the depressions 54 provided for the same in the casing wall or surface, as shown in Figs. 1 and 9. The tendency of said arms, however, is to yieldingly force body 47 out of its seat into the position shown in Fig. 9.

The air is drawn into the interior of the casing through an inlet passage 55, is compressed therein as hereinafter described, and is finally expelled through an outlet passage 56, the passage of the compressed air to the outlet being controlled by the valve mechanism D. This mechanism, which is illustrated in Fig. 1, is disposed within a tubular shell or casing 57 fitted, in turn, in a tubular casting 58 constituting an integral extension of the casing body 1. Casing 57 rests at its lower end upon a valve seat 59 which fits in a seat provided therefor in said body 1 and is formed with a plurality of openings 60 communicating with the interior of the casing body. These openings are normally closed by valves 61 whose hollow stems 62 telescopically receive the hollow inner ends of spindles 63, said hollow ends containing expansible coil springs 64. The reduced upper ends of the spindles project through openings formed in the cover plate 65 which is bolted or otherwise suitably fastened to the outer end of the casting 58. The spindles are further provided with collars 66 that are adapted to be drawn up against the inner surface of the cover plate when the nuts 67 threaded upon the projecting outer terminals of said spindles are turned in the proper direction. Communication between the interior of the valve casing 57 and the outlet passage 56 is effected through the medium of an annular passage 69 into which said outlet passage opens at its inner end, the valve casing being formed with a series of ports 70 leading to said an nular passage.

The operation is substantially as follows: On the application of power to the shaft 5, the piston will rotate within the main casing, and will carry with it the pressure members 252-l25, by reason of the projection of the arms 25 of said member through the slots 26. The connecting yoke 24 of the pressure member receives the roller 23 on the terminal crank 22 of shaft 4, and",

since this shaft is held stationary in its",

bearing, the action of said crank and its f roller on yoke 24 will be to impart an end-, wise reciprocatory movement to said pres-i sure member during the rotation 9f the pis-K ton, the wings thereof sliding freely through the slots 26. As the piston rotates, it will draw in air through the inlet passage 55, the air filling the space or chamber between the lower portions of the walls of the piston and casing, assuming that the piston is in the neutral position depicted in Fig. 1. The end walls of this chamber are formed by the ends of the wings 25 and by the blades 28, which latter are projected outwardly as far as possible by the centrifugal force initially exerted thereupon when the rotation of the piston commences. By reason of the eccentric mounting of the piston, said chamber will gradually decrease in size as the rotation of said piston continues and the left-hand wing approaches the top packing member a6; in consequence, the air contained therein will be gradually compressed, a portion of the compressed air flowing through the pas sages 30 and Q9 and acting upon the inner ends of the blades, to force the same outwardly of their slots. The air is retained in said chamber, however, owing to its inability to pass the tight joint produced by the action of packing member 46 upon the peripheral wall of the piston. The only outlet for the air, is accordingly, the valve casing 57 which communicates with the interior of the main casing, through the openings 60, and with the outlet 56 through the passage 69 and ports 70. The air, on reaching the proper degrees of compression, will therefore pass through said openings 60 and will raise valves 61 from their seats, after which it will flow through casing 57, ports 70, and passage 69, into the outlet 56, which leads to the storage tank or other suitable receptacle, (not shown).

I claim as my invention:

1. In a rotary pump, the combination of a casing; a piston located therewithin; means for rotating said piston; a pressure member carried by said piston for rotation therewith, said member being provided with a pair of arms having their side faces formed with intersecting series of longitudinal and transverse grooves; and packing members for said faces provided with series of intersecting longitudinal and transverse ribs fitting in said grooves.

2. In a rotary pump, the combmation of a casing comprising a hollow cylindrical body portion, a pair of end plates connected thereto, and gaskets interposed between the confronting edges of said body portion and said end plates; a piston rotatably mounted within said casing and composed of a body portion and a pair of trunnions, said body portion being formed with parallel peripheral slots extending from end to end thereof, and with radial slots in its end faces communicating with the ends of the adjacent peripheral slots; means for rotating said piston; a pair of annular packing members fitted upon said trunnions and disposed against the corresponding end faces of said piston body for coaction with the adjacent faces of said gaskets, said packing members being formed with radial slots registering with the first-named radial slots; and a series of U-shaped packing members having their central portions fitted in said peripheral slots and their legs fitted in said firstand secondnamed radial slots.

3. In a rotary pump, the combination of a casing comprising a hollow cylindrical. body portion, a pair of end plates connected thereto, and gaskets interposed between the confronting edges of said body portion and said end plates; a piston rotatably mounted within said casing and composed of a body portion and a pair of trunnions, said body portion being formed with parallel peripheral slots extending from end to end thereof, and with radial slots in its end faces communicating with the ends of the adja cent peripheral slots; means for rotating said piston; a pair of annular packing members fitted upon said trunnions and dis posed against the corresponding end faces of said piston body for coaction with the adjacent faces of said gaskets, said packing members being formed with radial slots registering with the first-named radial slots and provided with lateral branches; and a series of lJ-shaped packing members having their central portions fitted in said peripheral slots and their legs fitted in said first and second-named radial slots, said legs being provided with locking keys fitted in said branches.

i. In a rotary pump, the combination of a casing comprising a hollow cylindrical body 105 portion, a pair of end plates connected thereto, and gaskets interposed between the confronting edges of said body portion and said end plates; a piston rotatably mounted within said casing and composed of a body 110 portion and a pair of trunnions, said body portion being formed with parallel peripheral slots extending from end to end thereof, and with radial slots in its end faces communicating with the ends of the adja- 115 cent peripheral slots; means for rotating said piston; a pair of annular packing mem bers fitted upon said trunnions and disposed against the corresponding end faces of said piston body for coaction with the adjacent 120 faces of said gaskets, said packing members being formed with radial slots registering with the first-named radial slots, the coacting faces of said packing members and said piston body ends constituting companion 125 surfaces one of which is formed with a series of concentric annular ribs and the other with a series of concentric annular grooves wherein said ribs are received; and a series of U -shaped packing members having their 130 central portions fitted in said peripheral slots and their legs fitted in said firstand second-named radial slots.

5. In a rotary pump the combination of a casing comprising a hollow cylindrical body 10 within said casing and composed of a body )ortion and a pair of trunnions, said body )ortio'n being formed with parallel peripheral slots extending from end to end thereof, and with radial slots in 1ts end faces cominunicating with the ends of the adjacent 'P -perlplieral slots; means for rotating said piston; a pair of annular packing members fitted upon said trunnions and dlsposed agalnst the corresponding end faces of said piston body for coaction with the adjacent faces of said gaskets said packing members being formed with radial slots registering with the first-named radial slots and pro- .vided with lateral branches,-the coacting faces of said packing members'a-nd said piston body ends constituting companion surfaces one of which is formed with a series of concentric annular ribs and the other with a series of concentric annular grooves wherein said ribs are received; and a series of U-shaped packing members having their central portions fitted in said peripheral slots and their legs fitted in said firstand second-named radial slots, said legs being provided with locking keys fitted in said branches.

In testimony whereof I afliX my signature in presence of two witnesses.

ERNST MORELL. Witnesses THERESE Moms, WVALLI v. LATTORFF.

Copies of this patent may-be obtained for five cents each, by addressing the Commissioner of Patents,

1 Washington, D. G.

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