US2246277A - Rotary pump - Google Patents

Description

w. w. DAVIDSON June 17, 1941.

ROTARY IfUMP Filed '001. 1e, 1935 9 sheets-s119151 1 Julie 17, 1941.

W. W. DAVIDSON ROTARY PUMP Filqdoot. 16,:1956 9 sheets-sheet 2 .lune 17,-1941. ww, AVIDSON 2,246,277

ROTARY PUMP Filed'oct. 16, 195e 9 sheets-sheet s June 17, 1941. vw. w. DAVIDSON ROTARY PUMP 9 sheets-sheet 4 Filed 001'.. 16, 1936 June 17, 1941. w. w. DAVIDSON ROTARY PUMP Filed oct. 16, 193s 9 sham-sheet 5 Jue 17, 1941. w. w. DAVIDSON ROTARY PUMP Filed OGb. 16, 1936 9 Sheets-She??l 6 June 17, 1941. w. w. DAVIDSON ROTARY PUMP Filed Oct. 16, 1936 9 Sheets-Sheet 7 June 17, 1941.

W. W. DAVIDSON ROTARY PUMP Filed oct. 1s, 195e 9 Sheets-Sheet 8 9 Sheets`Sheet 9 W. W. DAVIDSON ROTARY PUMP Filed Oct. 16, 1956 June 17,- 1941.

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IIIIIII III' lulll 'III Ill III IIIIII .IIIIII IIIIIIII IIIII IIIIII IIIIIII' Il! IIIII Patented June 17, 1941 ROTARY PUMP William Ward'Davidson, Evanston, lll.

lApplication October 16, 1936, Serial No. 105,958

` (ci. 10s-121) 14 Claims.

'I'his inventionv relates to improvements in ro-` tary pumps, and has special relation to rotary pumps particularly adapted for pumping liquids, such as water, gasoline, oil, etc.

The object of the invention is to provide a rotary pump for this purpose, which shall have high eiiiciency in the use of power; in which the internal friction shall be reduced to a minimum; in the operation of which the leakage shall be inconsiderable; and in which the pressure shall be practically balanced on all moving parts thus reducing friction and the power consumption.

An important feature of the invention relates to simple means for sealing the bearings against the liquid operated upon, and particularly on the pressure side of the pump.

A further feature relates to a pump, for the purpose specified, in which the` operating parts of the pump are immersed in the liquid being pumped.

A further feature relates to simple means of relieving certain parts of all pressure, that is, of maintaining such'parts under atmospheric pressure.

Further features and advantages will become v apparent and the invention will be more readily understood from the following description taken in conjunction with the accompanying drawings, forming part of this specification, and in view of the appended claims.

In said drawings:

Fig. 1 is a longitudinal, vertical, central section of a pump which embodies the invention in what I now consider as a preferable form; i

Figs. 2, 3 and 4 are transverse, vertical section on the lines 2-2, 3-3 and 4-4 respectively of Fig. 1;

Fig. 5 is a fragmentary, vertical, longitudinal section on the line 5-5 of Fig.i2;

Fig. 6 is a fragmentary, vertical, transverse section on the line 6 6 of Fig. 1;

Fig. 7 is a fragmentary, side elevation of one of the cylinder heads particularly showing the inlet to the cylinder;

Fig. 8 is a fragmentary, central, longitudinal section of the cylinder, assembly and taken on the line 8 -8 of Fig. 9;

Fig. 9 is a transverse section on the line 9-9 of Fig. 8;

Fig. 10 is a fragmentary transverse section on the une iu-m of Fig. a;

Fig. 11 is a fragmentary, side elevation of the pump rotor and its supporting shaft or shank; Fig. 12 is a fragmentary, side elevation of the inner end portion ofthe rotor shaft;

Fig. 13 is a perspective view of the pump vane;

Fig. 14 is a perspective view of the rocking or oscillating member in which the pump vane is mounted;

Fig.` 15 is a view similar to Fig. 1, but showing an embodiment in which some parts are modied;

Fig. 16 is a view similar to Fig. 1 showing other. slight modifications;

Fig. 17 is a view similar to Fig. 1, and showing a different means for driving the pump;

Figs. 18 and 19 are transverse, vertical sections on the lines |8-|8 and |9|9 respectively of Fig. 17; I

Fig. 20 is a side elevation of the rotor and its shaft as shown in Fig. 17

Fig. 21 is a longitudinal, central section of the cylinder as shown in Fig. 17, one cylinder head being removed;

Fig. 22 is an end elevation of the rotor and vane assembly as shown in Fig. 17;

Fig. 23 is a side view and Fig. 24 is an end view, of the pump vane shown in Fig. 17;

Fig. 25 is an end View of the rocking member in which the vane is mounted as shown in Fig. 17;

Fig. 26 is a vertical, longitudinal section on the line 26-26 of Fig. 25; and

Fig. 27 is a fragmentary, longitudinal, central, section of the rotor and cylinder and taken on the line 21-21 of Fig. 18. l

Important features which adhere throughout the several different embodiments of the invention arey the submergence of the cylinder and rotor in the liquid being pumped and the balanced discharge of the liquid from the rotating parts of the pump.

In the preferred form as portrayed in Figs. l to 14 inclusive, thepump comprises a frame 30 in which there is a centrally arranged chamber 3| which is extended up to form a dome 32 provided with an inlet 33 for the liquid to be pumped.

This chamber is closed except for the liquid inlet 33 and in the lower part thereof the operating parts of the pump designated generally by A are arranged'.

The frame 30 has a horizontal base 34. An extension 35 is provided extending out horizontally from one side of the chamber 3| concentric with thepump A, and a second somewhat similar extension 36 .extends out horizontally and opposite to the extension 35, the extension 36 being arranged to one `side which is closed by the head 31 and through which the pump A. can be entered into the chamber 3|. 'I'he'head 31 is secured to the frame 38 by bolts 39.

The pump A comprises a rotatable cylinder 46 which, as shown, is built up of afcylindrical ring 4| which forms the cylindrical wall of the cylinder and closed at one end by a head 42 secured by bolts 43 (Fig. 2) and provided with an integral central bearing stem or shank 44 arranged to extend centrally through the frame extension 36 and be rotatably supported therein. The cylinder is closed at its opposite end by a head 45 similarly secured to the cylindrical ring 4i. The pump is provided with a bearing spindle or shank 46 which extends opposite to the shank 44 and is adapted to be rotatably supported in the rame extension 35.

The head 45 of the cylinder A is provided with a central opening 41 (Fig. 8) through which the inner end 48 of the bearing shank 46 extends into the cylinder of the pump and a rotor 49 is carried on said inner end 48 of the shank 46 and is secured thereto, as by key 58, to rotate therewith. The rotor 49 operatively fits between the inner faces of the cylinder heads 42 and 45. It is smaller in diameter than the internal diameter of the-cylindrical ring 4|, and is arranged in eccentric tangential relation to the cylinder thereby providing a crescent shaped pumping space or chamber (Fig. 9). The arrangement is such that as the pump A `is rotated the liquid to be pumped is drawn into said space 5i and then forcibly discharged therefrom.

For rotating the pump A the shank 44 may be extended beyondthe frame extension 38 as indicated at 52 in Fig. 1 and power applied thereto by any suitable means, not shown.

The pump is provided with a radial vane 53 (Figs. 9 and 10) to divide the inlet side of the chamber 5| from its discharge side. The vane 53 is fixed inthe cylindrical wall of the pump, being secured in a slot 54 by a key pin 54 and projects inwardly into the rotor 49, and it is exibly connected to the rotor by a cylindrical rocking member 55 mounted in a longitudinal, cylindrical opening 56 in the periphery of the rotor. The member 55 is provided with a central, gingitudinal slot 51 in which the vane slidingly To permit the liquid to enter the pump from the chamber 3|, that is to enter the pumping space 5|, the cylinder heads 42 and 45 are respectively provided with ports 58 and 59 at the suction side of the vane 53. To provide an outlet for the liquid from the pump, that is from the pumping space 5| a radial passage 68 is provided in the rotor 49, and is extended into the inner extension48 of the bearing shank 46 as shown at 6| and the bearing shank 46 is provided with a central passage 62 connecting atv its inner end with the discharge passage 6| and opening at its outer end into a. discharge chamber 63 which is provided with a discharge opening 64 through which the liquid is discharged from the pump.

The eccentric relation of the cylinder 40 and the rotor 49 is shown by the two center lines 65 and 66 on Figs. 2 and 3, the lower centerline 65 being the centerline of the cylinder 40 and the right hand bearing 36, and the upper centerline being that of the rotor 49 and the left hand bearing 5.

'I'he means for driving the pump has been explained, thepower being applied directly tothe cylinder 48, and the rotor 48 is driven through the vane 53 which, as has been explained, is rigidly mounted in the wall of the cylinder and has a. ilexible driving connection with the rotor 49 through cylindrical plug member 55.

' It will be observed that the vane 53 has an extended portion 61 which fits Within a cut-a-way portion 66 at the corresponding end of the rocker 55. 'Ihe purpose of this arrangement is to give the vane additional bearing area inasmuch as it is used to drive the'rotor and in the particular pump which is shown in the drawings, the eccentricity between the rotor and the cylinder is such that when the vane is 180 away from the point of tangency between the rotor and the cylinder, the inner margin of the principal portion of the vane is withdrawn approximately to the center of the rocker with the result that there is a tendency to concentrate driving stresses along the outer margins of the rocker instead of more or less evenly distributing them over the bearing surfaces of the rocker. The extension 61 minimizes this tendency and vthe rotor 49 is slotted at 69 to accommodate the extension of the vane.

In the form of pump being described the cylinder shank 44' is rotatably carried in ball bearings 10 arranged within the outer end of the frame extension 36 and 1| arranged within the inner end of same.

The bearing shank 46 of the rotor is likewise Y rotatably supported within the frame extension 35 by ball bearings 12 arranged within the outer end of the extension 35 and 13 arranged within the inner end of said extension. Each of the ball bearings, as usual, consists of an outer ball race secured to the outer stationary member, an inner ball race secured to the rotating member and a ring of balls between the two race members.

The outer race member 14 of the bearlng 18 is secured in the outer end of the frame extension 36 in a counter-bore 15 which provides a shoulder 16 and the race 14 is clamped against the shoulder 16 by a closure ilange 11 which is secured to the outer end of the extension 36 by bolts 18.

The ange 11 has a central opening 19 through which the shank 44 projects and the flange is provided with a plurality of internal grooves which assist in preventing the free escape of leakage along the shank.

'Ihe outer ball race 8| of the inner ball bearing 1| is likewise secured in a counter-bore 82 in the extension 36 which provides a shoulder 83 and the race is clamped against this shoulder by a relatively thin at ring 84 which is held against a circumferential shoulder 85 adjacent to the inner` end of the extension 36. The ring 84 is held against the shoulder 85 by the cylinder head 42, spacer rings 86 and 81 being drive itted on the shank 44 and interposed between the outer face of the cylinder head and the inner face of the ring 64. As will be explained these spacer rings have other important functions.

The inner bali races 88, of the outer ball bearing 18, and the inner ball race 89 of the inner ball bearing 1| are mounted directly on the shank 44 and are held in proper longitudinally spaced positions within their respective outer ball races by the cylinder head 42 at the inner end, a threaded clamping nut 90 on the shank 44 near its outer end the spacer rings 86 and 81 and a suitable spacer sleeve 9| between the two inner ball races 88 and 89. The outer end portion 92 of the shank 44 is reduced in diameter to provide a circumferential shoulder 93 against which the nut 90 is rmly clamped. The flanged closure plate 11 is provided with a suitable space 94 to receive the nut 50 and let it rotate freely with the shank Il.

As the ball bearings would permit the free escape of the liquid fromthe chamber 3|, I seal the chamber at the inner end of the extension by suitable means to be now described.

It is of course desirable to seal the chamber 3|, around the shank 44 with means which will not appreciably add friction and to this end the sealing means comprises a yielding thin, sheet metal bellows ring 95 interposed between a circumferential shoulder 98 on the spacer n'ng 86 and the inner face of a ring flange 91 rigidly secured in a counter-bore 90 at the inner end of the extension 36. This ange ring 91 is secured rigidly to the frame extension 36 by screws 09. The inner end of the bellows device comprises a ring which ts on the spacer 09 and bears against the shoulder 96, forming a running joint therewith, the inner end of the thin sheet metal bellows being sealed to the outer edge of the ring |00 as by being soldered thereto. The outer end of the sheet metal bellows is sealed to the inner edge of the flange ring 31 as by being soldered thereto. The inner edge of the xed flange ring 91 is free of any rotating part.

Between the flange ring 91 and the ring 04 f there is provided a free space 0| which forms a. chamber to catch any liquid which might possibly pass the sealing device. In order to prevent any accumulation of liquid in the catch chamber |0I it is provided with a suitable drain opening |02 opening out through one side of the `pump frame and to permit the leakage to seals, is used on the other side of the pump between the cylinder head 45 and the'bearing 13 and again at the end of the shaft Il between the discharge chamber 63 and thebearing 12.

The arrangement is such that there ls a free l running contact between these two rings and the outer edge of the fixed ring 04 is so formed as to be free of the inner ball race 59 to avoid any friction at this point.

The chamber 3| is similarly sealed around the opposite shank 48 except that it is so iarranged that there is a slight end play allowed to the rotor and its shank so that the rotor will not be bound between the two cylinder pump cylinder.

lt will be seen that the ring |05 at the inner end of the bellows device which seals the chamber 3| around the shank B6, bears directly against the cylinder head instead of against a spacer ring as at the other side of the cylinder, and that the outer spacer ring |09, which is drive heads of the tted on the shaft, and which is similar to the` outer ring 81 at the other side bears against a shoulder |01 on the shank 46 instead of against an inner spacer ring as at the opposite sides, in other words the rotor and its shank are not definitely held longitudinally of the shank, independently of the cylinder.

If the discharge of the'liquid were axially through the outer'end of the shank 4l' there would be a back pressure which would tend to force the rotor to the right, Fig. 1, and thus cause friction between the rotor and the cylinder head I2. To counteract this the liquid is discharged radially by a construction now to be described.

The outer end of the shank 06 is externally screw threaded as shown at |08 to receive a discharge cap |09 which has an internally screwthreaded nozzle ||0 to fit on the outer end of the shank 45. 'I'he cap |09 is closed at its cute:

end by a wall I|| and its periphery is provided with a series of oppositely disposed radial discharge openings ||2 through which the liquid escapes into the chamber 63.

For the purpose of sealing the chamber 53 against the escape or leakage of the liquid around the shank 45 there is provided a bellows packing device lll'similar to those already described and so arranged that the shank and rotor are yieldingly held axially of the rotor to prevent the development of unnecessary friction between the rotor and the cylinder. The construction of the bellows packing next to the cylinder head 45 and at the outer end of the shank 40 provide catch chambers ||4 and ||5 respectively which as described in relation to the catch chamber |0| are provided with lopen drains and vent openings.

The construction of the bellows packings at each end of the pump cylinder provide a free space III between the cylinder head 42 and the adjacent wall of the chamber 3| and a similar space ||1 at the opposite end of the cylinder and which spaces permit the free flow of the liquid from the chamber 3| through the cylinder ports 58 and 59 into-the cylinder.

Referring now particularly to Figs. 1, 2,y 5, 6, 7, 8 and 9, the cylinder rotatesv in the direction of the arrows ||0 Fig. 2 and ||9 Fig. 6 and from Fig. 9 it will be readily understood that,just as the rotor is passing the point shown in Fig. 9, the duid in the pump chamber .5| could escape back through the inlet openings. To prevent this action, stationary stop plates |20 at one side and |2| at the other side are'provided which cover the inlet ports and 59 respectively during such period of rotation of the cylinder.

These stop plates vas best shown in Fig. 5 are secured to the stationary ring .plates 91 of the sealing devices at the `ends of the cylinder and have at faces which contact with the. outer faces of the cylinder heads..

It will be noted that the forward sides of the tent as shown at |22 toward the outer faces of y -the cylinder heads, and the walls of the ports yco which are first uncovered are inclined inwardly toward the cylinder and this permits the liquid to easily flow into the cylinder and assure the filling of the pump space 5|.

Referring now to Fig. l5, it will be seen that the construction illustrated is the same as that already described in so far as the pump, its method of driving, and the means of sealing thechamber 3| is concerned, but that a different means is provided for sealing the delivery chamber 53.

e The means for this purpose, as shown in Fig. l5, comprises a delivery nozzle, |23 provided with an externally screw threaded connection projection |20 adapted to be received within the outer end of the central delivery passage 82 in the rotor shank I9. The nomle '|23 providesy a circumfer the shanks 44 and 46. comprise an L-shaped ring casing |45 which nts entialshoulder |25 at the outer end of the shank 46 and a spacer sleeve |26 is interposed on the shank 46 between said shoulder |25 and the inner ball race |21 of the outer ball bearing 12 on the shank 46. The outer end portion |28 of the frame extension 35 is cut off from the main inner portion of said extension by an open notch or gap |29. The part |20 contains the discharge chamber 63 and its inner wall is provided with a cylindrical opening |30 in which the spacer sleeve |26 fits tightly. To prevent possible leakage along the outer surface of this sleeve there is provided, at its inner end, a stufling box |3| containing compressible packing |32 and a stuiier gland |33 is provided. The gland ts on the outer surface of the spacer sleeve |26 and is adapted to be forced into the stuillng box by any suitable means such as screw bolts |34 to hold the packing |32 properly compressed. I

As in the first form described, the delivery nozzle |23 has a plurality of radial and oppositely vdisposed delivery openings |35 which balance each other. f

In Fig. 16 there is shown a construction with plain sleeve bearings instead of the ball bearings shown in the forms already described. In this present form a packing for the outer end of the shank 46 of theV rotor is provided which is the same as that shown in Fig. 15.

The shank 44 of the cylinder is rotatably mounted in elongated bearing sleeves |36, at its outer end, and |31 at its inner end separated by a chamber |30 within the frame extension and the chamber |30 is adapted to be illled with a heavy lubricating grease, through a grease cup |39, which, together with the elongated bearing sleeves, leil'ectively prevents the leakage of the liquid particularly as it is only necessary to pack or seal against the suction side of the pump.

Likewise the shank 46 of the rotor is mounted in a relatively long sleeve bearing |40 at its inner end which can likewise be supplied with heavy bearing grease through a grease cup |4|.

As this pump is generally of simpler construction than the forms heretofore described it is provided with simpler sealing means for the inlet chamber 3|.

The cylinder shank 44 is enlarged at its inner end as shown at |42 and a circumferential shoulder |43 is provided which contacts with 'the inner end |44 of the inner sleeve bearing |31.

On the opposite side the shank 46 of the rotor is similarly enlarged at its inner end. as shown at |42', and a circumferential shoulder |43'- is provided which contacts with the inner end |44* of the sleeve bearing |40. Thus the cylinder and rotor are held against longitudinal movement outwardly. 'Ihis construction retains the cylinder'and the rotor in position free of the walls of the chamber 3|.

A simple known form of packing is used to seal the chamber around the enlargements of Each of these packings in a counter-bore |46 in the wall of the chamber 3| surrounding the shank. Within this casing is arranged an L-Shaped packing ring member |41 one leg of which fits on the enlarged part of the shank and the other' leg of which is arranged in contact with the radial wall |40 of the L-shaped casing. The inner leg |49' of the L-shaped packing is tapered down toward the chamber 3| to quite a thin edge and this packing 75 ring is made of some yielding material such as leather or a suitable composition. l

The slight pressure within the chamber 3| tends to cause the thin edge of the packing ring |49 to hug the shank and thus prevent leakage at this point. To assist in this action an`dprevent the possible lifting of this thin edge there is a pressure ring |50 provided, the inner part of which is flared so as to be inclined nearly parallel to the thin tapered edge of the packing and this ring is yieldingly pressed against the packing by a spring washer |5| which is held within the casing member |45 by a second L-shaped casing ring member |52 which ilts within the member |45 and backs up the spring washer |5|.

As the chamber 3| constitutes the suction chamy ber of the pump the pressure therein is quite slight and it has been found that this form of packing is eifective and does not add appreciable friction.

Referring now to Figs. 17 to 26 inclusive;

In these gures there is illustrated a simple form of the invention and including a gear driven pump, especially adapted for use in sizes too large to be connected directly to an electric motor and foruse in the pumping of oil or like liquids. In this form there is a hollow frame or casing |53 having a bottom wall |54 and side walls forming a chamber 55 which is closed at one end by a removable head |56 secured in place by bolts |51.

A pump B is rotatably mounted within the. chamber |55 and comprises a rotatable pump cylinder` |50 closed at its ends by opposed heads |59-|60 which are secured to the cylinder by bolts |6|.

Within the cylinder is a rotor |62 operatively tting between the inner ilat faces of the cylinderv heads and arranged, as before, in eccentric tangential relation to the cylinder to provide a crescent shaped pumping space or chamber |63.

For rotatably supporting the cylinder and rotor in their eccentric tangential relation there are provided oppositely disposed xed bearing members 54| 65 each comprising a base flange |66, at one end adapted to be secured to a vertical end wall |61 oi' the pump frame, and at the other end to be secured to the inner face of the frame head |56. Each bearing member is provided with a cylindrical bearing projection and the pump cylinder |50 is rotatably mounted on the outer cylindrical surfaces of these projections, A,the cylinder heads being provided with a hollow cylindrical bearing projection |50 adapted to operatively ilt on the outer surfaces of said xed bearing projections |60 and be rotatably supported there- The rotor |62 has a centrally disposed bearing shank |10 at each end which shanks are received within longitudinal bearing openings |1| in the rigid opposed bearings.

The bearing openings |1| are arranged in ec- -centric relations to the outer bearingsurfaces oi the bearing projectionssimilar to the eccentric relation of the cylinder |50 and rotor |62 iand maintain these parts in their operative relaion.

As in the forms heretofore described a vane |12 is fixed in radial position in the cylinder wall and has a similar flexible connection with the rotor, that is, a cylindrical plug |13 is arranged in the periphery of the rotor and is longitudinally slotted, as shown at |14 to receive the vane |13. In this form the vane has an inwardly extending projection |15 at each end and the slot |14 in the plug |12 is cut clear through the plug at its aarden* tions add to the radial engagement of the plug and vane and assist in preventing any cramping or binding between these two parts.

'Ihe heads |59 and |60 of the cylinder are pro- 4vided with inlet ports |16 atA the suction side of the vane |12 to admit the liquid from the pump casing to the pumpand, as before, a discharge passage |11 is provided extending radially through the rotor at the pressure side of the `vane |12 and communicating at its inner end with a central discharge passage |18 extending longitudinally through the rotor shanks |10. This discharge passage |18 extends from en d to end of the rotor and its shanks and communicates at its ends with a passage |19 formed in the wall of the pump casing and provided at one end with a delivery opening |80.

For applying power to thecylinder |58 to roA tate same and operate the pump the cylinder is provided with a ring of gear teeth |8| on its outer cylindrical surface 'and a toothed pinion |82 is provided to mesh therewith. The pinion is secured upon the inner end of a drive shaft |83 which extends through a frame extension |84' and is provided, on its outer end, with suitable means for driving same such as a belt pulley |85 secured thereto.

The pinion is arranged Within the pump. casing and as the material intended to be pumped is of a lubricating nature, no special arrangement is provided for lubricating the various bearings and the gears.

As the shaft |83 extends outside of the casing, simple packing means |86, are provided to prevent the escape of the liquid at the -outer` to the specific details of construction oroperation v herein shown and described.

Throughout the appended claims, the term..

rotor is used in a broad sense and is intended to Iiincl'ude all forms of inner pump members which` by some form ofV rotary motion cooperate with the cylindrical pump chamberto produce a pump-- ing action.

I claim:

1. In a rotary pump of the kind described, a-

pump frame having a supply chamber, a rotary pump cylinder arranged in the chamber and adapted to be submerged in the supply liquid, heads for the cylinder, inlet ports extending longitudinally through the heads, a rotor within the part ofthe pump adapted to bel submerged in the supply liquid, heads for the cylinder, inlet ports extending l'ongitudinally through the heads, a rotor within the4 cylinder and arranged in eccentric tangential relation thereto, a pumping vane having engagement with the cylinder and rotor, said inlet .ports arranged' on the suction side of said vane, and means in Vsaid chamber for closing said ports during the y period of the cycle when the vane is at and closely adjacent to the point of'tangency between the rotor and the cylinder, said cylinder and said vided with a'fluid inlet chamber,- a rotarypump in the chamber comprising a rotatable cylinder having an axially extending trunnion shaft, a rotor mounted in the cylinder in eccentric tangential relation and havingan oppositely axially extending trunnion shaft, means for introducing fluid from the chambe into the cylinder and discharging it through he of the shafts, means for rotating the cylinder and rotor to produce y a pumping action therebetween, bearing supports for both shafts positioned on the outside of the inlet chamber, and sealing means on both shafts between the bearing supports and the inlet chamber.

4. In a pump for handling liquids, a casing provided with a fluid inlet chamber, a rotary pump in the chamber comprising a rotatable cylinder having an axially extending trunnion shaft, a

rotor mounted in the cylinder in eccentric tangential relation and having an oppositely axially extending trunnion shaft, means for introducing fluid from the chamber into `the/cylinder and discharging it through one of theshafts, means for rotating the cylinder and rotor to produce apumping action therebetween, bearing supports for both shafts positionedon the outsideof the y I v inlet chamber, means for introducing a lubricant into the bearing supports, and sealing means on both shafts between the bearing supports and the cylinder and arranged in eccentric tangential relation thereto, a pumping vane having engagement with the cylinder and rotor, said inletports larranged on the suction side of said vane, and

means in said chamber for closing said ports during the period of the cycle when the vane is at and closely adjacent to the point `of tangency between the rotor and the cylinder, said port closing means comprising fixed segmental plates arranged in contact with the outer faces of the cylinder heads.

2. In a rotary pump of the kind described, a

l pump frame having a supply chamber, a rotary inlet chamber, said sealing means comprising spaced seals separated by an opening into which liquid or lubricant, as the case may be, may leak upon the partial or complete failure of either of the seals. f i f 5. In a' pump for handling fluids, a casing provided with a fluid inlet chamber, la rotary pump in the chamber comprising a rotatable cylinder having an axially extending trunnion shaft, arotor mounted in the cylinder in eccentric tangential relation and having an oppositely axially extending trunnion shaft, means for introducing fluid from the chamber into they cylinderY and subsequently discharging it through one of lthe shafts, means for rotating the cylinder and rotor to produce a pumping action therebetween, bearing supports for both shafts positioned on the. outside of the inlet chamber, means for introducing .a 1upump cyllnder arranged in the chamber, and

bricantv into the bearing supports, a discharge chamber associated with one of said shafts, and sealing-means located between the discharge chamber and the adjacent bearing and between, the fluid chamber'and the bearing associated with the other shaft, said sealing means each shaft, a rotor eccentrically mounted within the cylinder having an oppositely axially extending trunnion shaft, bearings .for said shafts located wholly outside of the pump cylinder, means for introducing lubricant into said bearings, a discharge chamber at the end of oneof the shafts fory receiving high pressure liquid, means for sealing the discharge chamber from the adjacent bearing including spaced seals separated by an opening into which the liquid or lubricant, as the case may be, may leak in the event of partial or complete failure of either of the seals, an intake chamber associated with the other'shaft, and means for sealing said intake chamber from the adjacent bearing, said last-named means including spaced seals separated by an lopening into which liquid or lubricant, as the case may be, may leak in the event of partial or complete failure of either of the last-named seals.

7. In a rotary pump for handling fluids, a iluid inlet chamber, aV hollow rotatable cylinder mounted in the chamber for rotation about its axis, a rotor within the cylinder lmounted in eccentric tangential relation with the cylinder for rotation about itsl axis, a single vane connecting the :rotor and the cylinder and dividing the pump chamber therebetween into intake and discharge stages, an inlet passage through the cylinder adjacent to the periphery of the cylinder and located onone side .of the vane, a. discharge passage extendingthrough the rotor and located on the other side of the van'e, a valve for the intake ,passage, and meanswhereby the iluid inlet chamber is kept in open communication with the pump chamber except for the brief interval during which the vane is at and immediately adjacent tov the point of tangency between the cylinder and -the rotor at which timethe intake passage is communicating with 'the pump chamber on opposite sides of the vane,avalve for theinthe other side of the vane, a valve for the intake passage, and means whereby the fluid inlet chamber is kept in open communication with the pump chamber except for the brief interval during which the vane is at and immediately adjacent to the 4point of tangency between the cylinder and the rotor at which time lthe intake passage is the chamber comprising a rotatable cylinder having an axially extending trunnion shaft, a rotor mounted in the cylinder in eccentric tan,- gential relation and having an oppositely axially extending trunnion shaft, means for introducing fluid into the cylinder and discharging it including a passage through -one of the shafts, means for rotating the cylinder and rotor to produce a pumping action therebetween, bearing supports for .both shafts positioned on the outside of the chamber, and sealing means on both shafts between the bearing supports and the chamber.

11 In a pump for handling liquids, a casing proviiied with a uid chamber, a rotary pump in the chamber comprising a rotatable cylinder havingan axially extending trunnion shaft, a rotor vmounted in the cylinder in eccentric tangential relation and having an oppositely axially extending trunnionshaft, means for introducing fluid into the cylinder and discharging it including a passage through one of the shafts, means for rotating the cylinder and rotor to produce a pumping action therebetween, bearing supports for both shafts positioned on the outside of `the chamber, means for introducing a lubricant into the bearing supports, and sealing means on both shafts between the bearing supports and the chamber, said sealing means comprising spaced seals separated by an opening into which liquid or lubricant, as the casev may be, may leak upon the partial failure of either of the seals.

12. In a pump'v for handling fluids, la casing -provided with a fluid chamber, a rotary pump in the chamber comprising a rotatable cylinder, a rotor mounted inthe cylinder in. eccentric tangential relation and having an axially extending trunnion shaft, means for introducing fluid into the cylinder and subsequently discharging it including a passage in the shaft, means for rotake passage, and means wherebyA the uid intake l A passage is kept in open-communication with the pump chamber except for the brief interval during which the vane is at and immediately adjacent to the rotor at which time the intake passage is closed by said valve.

rotor and the cylinder and dividing the pump chamber therebetween into intake and discharge stages, an inlet vpassage through the cylinder adjacent to the periphery of the cylinderand located on one side of the vane, a discharge passage extending through the rotor and located on thefpoint of tangency between the cylinder and tating the cylinder and rotor to produce a pump action therebetween,v a conduit chamber associated with the shaft, a bearing support for the shaft between the fluid chamber and the conduit chamber, means for introducing a lubricant into the bearing support, sealing means located between the bearing support and each of said chambers, said sealing means each comprising 'spaced seals separated by an opening into which cept whenadjacent the point ofl tangency, inlet' and outlet ports communicating witlr the chamber on opposite sides of the vane and lone of the wall and closes said one 4-port lwhen the vane is approximately at the position of tangency to prevent reverse ow of uid through said one port.

' 14:. In a. rotary pump, a pumping couple including a cylinder wall and a piston eccentrically disposed in tangential .relation to the cylinder wall, end walls associated with the cylinder and the piston to form a pumping chamber, a vane dividing the pumping chamber except when' adjacent the point of tangency, and means for rotating at least one of the members of the pumping couple to cause a relative rotation between the vane and the point of tangency, inlet and out-- letports communicating with the -two parts of the lpumping chamber, the inlet port extending through a rotating surface o! the pumping couple, and a stationary valve member positioned to engage the surface and close said inlet port when the vane is adjacent the point of tangency to prevent reverse fiow`of the pumped uid through y said inlet port, while leaving the inlet port open during a major portion of the revolution o! the rotary member. y WILLIAM WARD DAVIDSON.

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