US1412091A - Rotary pump or compressor - Google Patents

Description

H. R. RICARDO.

` ROTARY PUMP 0R COMPRESSOR.\

APPLICATION FILED IIIAII. 2, 1921.

11 l 2,99 l Patented Aplu M, 192,2.

2 SHEE fS-SHEET I.

H. R. RICARDO.

yROTARY PUMP 0R COMPRESSOR.

APPLICATION FILED IIIAII. 2. 1921.

Paten@ Apr. 11, 1922.

lAIQl.

2 SHEETS-SHEET 2.

m, mi y ma.

HARRY RALPH RICARDO, OF LONDON',A ENGLAND.

' Ronny PUMP on conrPREssoa. v

To all 'whom it may concer/rt.'

Be it known that I, HARRY RALPH RI'- cARDo, .a vsubject of the King of England, and residing at London, in England, have invented certain new and useful Improvements in Rotary Pumps or Compressors, of which the following is a specification.

This invention relates to rotary pumps or compressors of the type comprising a series of cylinders disposed radially with respect to a centre about which they can be rotated these cylinders containing pistons at the end of each of which is a roller adapted to run on a circular track mounted so as to be rotatable but eccentric to the axis about which the cylinders rotate, the cylinders having inlet and outlet ports controlled by corresponding ports formed in a fixed spindle or trunnion about which the cylindersrotate..

In pumps or compressors of this type as previously known and constructed, there lis liable to be a difficulty in effecting satisfactory lubrication if such a pump is used for the purpose of operating'on certain gases though these may be of a nature which will not attack iron and steel. The object of the present invention is to improve the constructio`n of such pumps so as not only ,to vercome the difficulty of lubrication if the pumps are usediwith gases of the type indi cated, but also to enable a pump to be constructed which will have a high volumetric efficiency and low mechanical losses.

According to this invention the rotor which carries the cylinders is mounted in balll or roller bearings which are disposed on or adjacent to the fixed trunnion or spindle about which the rotor turns in such a way that .the bore or interior of the rotor is not in ycontact with the exterior of the trunnion, a Huid-tight jolnt being formed between these parts by means of ra liquid film or a labyrinth packing. A ball nonreturn valve is disposed in the trunnion near the port through which the fiuidon" which the pump operates is delivered from the cylinders intol the delivery passage which is formed longitudinally in the trun` nion and by this .arrangement clearance losses are kept small. By this construction a single automatic delivery valve fitted in a Specification of Letters Patent. Patented Apr 11, 19220 Application led March 2.

1921. Serial No. 449,166.

longitudinal passage which. extends into the trunnion to a point adjacent to the valve. The heat which flows into the trunnion as a result of .the compression of the Huid on which the pump operates is removed to a considerable extent as this fluid passes through the port at a high velocity and high pressure so. that it parts readily with its heat and heat is thus prevented from flowing along the trunnion so as to cause thinning ofthe liquid packing film contained between the rotor and the trunnion. j

The invention may be carried out in practice in various ways but the accompanying drawings illustrate by way of example a construction that may be adopted. In these v drawings Figure l'is a sectional elevation of the 1 improved pump the section being taken in the plane of the axis of the fixed trunnion and driving shaft.

Figure 2 is a transverse section on the line 2 2 in Figure 1 looking in the direction of the arrows.

'Like letters indicate like parts throughout the drawings. A trunnion diameter is fixed to and projects into one side of an outer casing which is conveniently formed in two parts B and B adapted to contain the pump. From theouter end of .the trunnion and extending longitudinally through it for a substantial part of its length is a passage from Whose inner end leads radially a passage C which terminates in a delivery port C2 through which the fluid can pass from the cylinders into the passage C. Near the inner end of thev longitudinal passage C is a coned seat D on which rests a ball D constituting a nonreturn valve the ball being held on its seat by a coiled spring D,2 one end of which bears on the ball while the other end abuts against a shoulder formed near the end 'of a rod E. The outer end E of this .rod constitutes a plug which closes the end of the passage C the rod itself Iextending along the passage which atthis part conveniently has a greater diameter than the extreme inner end beyond the seating D for the ball valve. The extreme inner end E2 of the rod E constitutes A having a suitable length and a stop against which the ball D will stri-ke when lifted. From the outer end of the pasf vsage C aradial opening leads to a delivery pipe F and in this opening is a coned seatF for @hall valve F2, This constitutes a sec-l ondnon-return valve in the delivery branch or passage. The passage C is'conveniently positioned out of the axial centre of the trunnion A.y A second passage G runs parallel to the passage C longitudinally into the trunnion A from its outer end and extends beyond the end of the passage C to a point adjacent to the inner end of the trunnion. Concentrically disposed within the passage G is a tube G whose inner end which is open is preferably suitably supported and lies ne'ar the inner end of the passage while the outer end of the tube extends through a plug G2 which closes the end ofthe passage G the plug G2 constituting a pipe union. Water is introduced into the end of the tube G and flows thence to the end of the passage G returning outwardly along this passage to a lateral outlet G3 which terminates in a pipe union.

An inlet port H is formed in the periphery of the trunnion A nearer to the inner end of the latter than the delivery port C2 these ports being suitably disposed on opposite sides of the trunnion. The port H communicates through a short radial passage with the inner end of a longitudinal passage Il" which extends into -the trunnion from the inner end thereof. In the .construction shown this passage H while being parallel with the axis of the trunnion A is eccentrically disposed with relation thereto and the end of the passage opens out into a ball bearing J on the end of the trunnion A. In some cases the passage H may be centrally disposed in the trunnion A butv the arrangement illustrated permits the water passage G to be Carried further towards the inner end of the trunnion than if the intake passage H is disposed on or near the axis of the trunnion. In this way the metal of the trunnion may be cooled substantially throughout its length.

`The rotor is carried on the trunnion A by the ball bearing J and by a ball bearing J disposed on the trunnion near the inner side of the casing' part B which carriesv the trunnion. The rotor comprises a sleeve K on v which are carried a' series of radially arranged cylinders L which, as shown in the drawing, are conveniently three in number. These cylinders are formed on a cylindrical member L having a flange L2 near one end which extends between the cylinders and supports them. This flange L2 is bolted to a flange K at one end of the sleeve K the flange K having a -lateral rib K2 which is supported on the ball bearing J while the other end of the vsleeve K is carried by the ball bearing J. If desired radiating fins or ribs may be provided which extend preferably in the 'circumferential direction around the rotor over the cylinders L and the flange L2. The sleeve K fits on to the trunnion A but is not actually in contact with it7` a fluidtight joint between the parts/being formed by means of a liquid film or labyrinth packing.

The sleeve K constitutes the inner ends of the cylinders L and in this sleeve at the end of each cylinder there are formed two ports K3 K4. The port K3 serves as the delivery port and is positioned so as to register with the delivery portY C2 in the trunnion A as the rotorlturns on the trunnion. The port K4 constitutes the inlet port and is positioned so as to register with the port I-I in the trunnion. By employing this construction for the cylinders the bores thereof can be machined Iright through so as to facilitate manufacture while the formation of the inlet and delivery'ports is simplified. In each cylinder is a piston M of suitable construction which carries at its outer end a roller M which lies in 'Contact with a circular track N. This track is cylindrical and is carried by a two-part casing member N N2 the inwardly curved or flanged end portions of which rest on ball bearings O and O disposed between the member N N2 and the adjacent sides of the outer casing B B.

These ball bearings O O and the axis of the track N are eccentric with respect to the axis of the fixed trunnion A. The track N can thus rotate about an axis which is not coincident with the axis aboutJ which the rotor K L rotates. The rollers M which are interposed between the pistons M and the track N are maintained in Contact with the track by the action of centrifugal force on the pistonsas the rotor rotates on the fixed trunnion Openings suitably shaped and disposed may be formed through the track-carrying member N N2 so as to permit of the inflow of the fluid on 'which the pump operates or as in the construction illustrated the fiuid may pass into the member or casing N N2 through the ball bearings O O. The fluid enters the outer casing B B through one or more suitably disposed openings such as B2to which the fluid is led by piping.

The rotor K L may be rotated in various ways but conveniently the inner end of the sleeve K is'castellate'd as at K5 or formed with projections which extend beyond and around the inner end of the trunnion A. disc P or the like having a periphery which is toothed or otherwise formed to engage the castellations A5 on the end of the sleeve K is mounted on the inner end of a spindle P' which is rotatably carried in the side mem.- ber B of the outer casing. The spindle P is co-axial with the fixed trunnion A and is mounted in suitable bearings. On its outer end the spindle P carries a pulley or is otherwise constructed as may be desired so that power can be imparted to it. A stuffing box is conveniently arranged where the spindle passes through the side of the casing B.

As the spindle P is turned the rotor K L is caused to rotate on the fixed trunnion A and the pistons M which move outwardlyv .ber N N2 which carries the floating track ports H in the trunnion and K? in the end of the cylinder when these ports register as the cylinders rotate on the trunnion. The fluid is compressed as each piston is moved inwardly by the action of the eccentric track N and when the cylinder delivery ports K3 register in turn with the delivery port C2 in the trunnion the fluid will travel pastthe non-return valve D into the delivery passage C and thence past the second nonreturn valve F2 into the delivery pipe F.

When the ports K3 K4 and C2 H are not registering they are sealed respectively by the liquid film or labyrinth packing between the sleeve -K and the trunnion A. The sealing liquid between these parts may be the lubricant employed to lubricate the interior.

of the pump.

The details of construction may be modified to suit requirements and the purpose for which the rotary pump o-r compressor is to be used. The number of cylinders may vary as also the manner in which they are disposed on the member or members constituting the. rotor. The floating track N which acts on the pistons may be constructed and arranged in various ways and the formation of the pistons and the rollers M or like members interposed between the pistons and the track N may be modified as Jfound desirable. Various forms of coupling other than that more particularly described above may be used between the inner end of the rotor K L and. the adjacent end of the spindle P through which power is applied to the rotor.

What I claim as my invention and desire to secure by Letters Patent is l. In a rotary pump or compressor the combination of' a fixed trunnion having inlet and delivery ports therein, inlet and delivery passages extending longitudinally through the trunnion and communicating respectively with the inlet and delivery ports, a non-return valve in the delivery passage, a

rotor which is rotatably mounted on the trunnion and comprises a plurality of radially disposed cylindersfcontaining pistons, inlet and delivery ports in the heads of these cylinders adapted to register with the ports in the trunnion as the rotor rotates, a. floating ring member rotatably carried in bearings eccentric to the trunnion and the rotor the inner face of this ring member being operative on the pistons in the cylinders, an outer casing enclosing the'ring member and the rotor and having an inlet thereto, and means for rotating the rotor on t-he trunnion as set forth. r

, 2. In a rotary pump or compressor the4 combination of a fixed trunnion having inlet and delivery ports therein, a single delivery passage and an inlet passage extending longitudinally through the trunnion and communicating respectively with the delivery and inlet ports, a non-return valve in the delivery passage, a. rotor which is rotatably mounted on the trunnion'and comprises a plurality of radially' disposed cylinders containing pistons, inlet and delivery ports in the heads of these cylinders adapted to register with the ports in the trunnion as the rotor rotates, a floating ring member rotatablycarried inbearings eccentric to the trunnion and the rotor the inner face of this ring member being operative on the pistons in the cylinders, an outer casing enclosing the ring member and the rotor and having' an inlet thereto, and means for rotating the rotor on the trunnion as set forth.v

8. In a rotary pump or compressor the combination of a fixed trunnion having inlet and delivery ports therein, a. single delivery passage and an inlet passage extending longitudinally through the trunnion and communicating respectively with the delivery and inlet ports, a non-return valve positioned in `the delivery passage adjacent to that end which communicates'with the delivery port, a. rotor which is rotatably mounted on the trunnion and comprises a plurality4 of radially disposed cylinders containing pistons, inlet and delivery ports in the heads the ports in the trunnion as the rotor rotates,

a floating ring member rotatably carried in bearings eccentric to the trunnion and the rotor the inner face of this ring member being operative on the pistons in the cylinders, an outer casing enclosing the ring member and the rotor and having an inlet thereto, and means for rotating the rotor on the trunnion as set forth.

4. In a rotary pump or compressor the combination of a fixed trunnion having inlet and delivery ports therein, a delivery passage and an inlet passage in the trunnion the delivery passage extending longitudinally through the trunnion, from the delivery port with which it communicates towards the fixed end of the trunnion and the inlet passage extending from the port with which it communicates longitudinally `through the trunnion in the opposite direc- 5. In a rotary pump or compressor the.

combination ofa fixed trunnion having inlet and delivery ports therein, inlet and delivery passages extending longitudinally through the trunnion and communicating respectively with the inlet and delivery ports, A

a non-return valve in the delivery passage, means for circulating Water through the trunnion, a rotor Which is rotatably mounted on the trunnion and comprises a plurality of radiallyv disposed cylinders containing pistons, inlet and delivery ports in the heads of these cylinders adapted to register with the ports in the trunnion as the rotor rotates, a ioating ring member rotatably carried in lbearings eccentric to the trunnion and the rotor the inner face of this ring member being operative on the pistons in the cylinders, an outer casing enclosing the ring member and the rotor and having an inlet thereto, and meansfor rotating the rotor on the trunnion as set forth.

6. In a rotary pump or compressor the combination of a fixed trunnion having inlet and delivery ports therein, inlet and delivery passages extending longitudinally through the trunnion and communicating respectively with the inlet and delivery ports, a nonreturn valve in the delivery passage, a rotor rotatably carried by ball bearings t on the trunnion the rotor comprisinga plurality of radially disposed cylinders containing pistons, inlet and delivery ports in the heads of these cylinders adapted to register with the portsin the trunnion as the rotor rotates, a liquid film between the interior of the rotor and the' exterior of the trunnion the film forming a seal for the ports in these parts, a floating ring member rotatably carried in bearings eccentric to the bearings and the rotor the inner face of this ring member ibeing operative on the pistons in the cylinders, an outer casing enclosing the ring member and the rotor and having an inlet thereto, and means for rotating the rotor on the trunnion as set forth.

7 In a rotary pump or compressor the combination of a fixed trunnion having inlet and delivery ports therein, a single .delivery passage and an inlet passage extending longitudinally through the trunnion and communicating respectively with the delivery on a sleeve member which constitutes the heads of the `cylinders, inlet and delivery ports inthe sleeve member at the inner ends of' cylinders these ports being'adapted to register with the ports in the trunnion as theifg'rotor rotates, a floating ring lmember rotatably carriedin bearings eccentric to the trunnion and the rotor the inner face of this ring member being operative on the pistons in the cylinders, an outer casing enclosing the ring member and the rotor and having an `inlet thereto, and means for rotating the rotor on the trunnion as set forth.

8. In a rotary pump or compressor the combination of a fixed trunnion having inlet and delivery ports therein, a single delivery passage and an inlet passage in the trunnion the delivery passage extending longitudinally through the trunnion from the delivery port with which it communicates towards the fixed end of the trunnion andthe inlet passage extending from the port with which it communicates longitudinally through the trunnion in the opposite direction to the delivery passage, a non-return valve positioned in the delivery passage adjacent to that end which communicates with the delivery port, a rotor which is rotatably 'mounted on the trunnion and comprises a plurality of radially disposed cylinders containing pistons, inlet and delivery ports in the heads of these cylinders adapted to register With the ports in the trunnion as the rotor rotates, a floating ring member rotatably carried in bearings eccentric to the trunnion and the rotor the inner face of this ring member being operative on the pistons in the cylinders, an outer casing enclosing the ring member and the rotor and having an inlet thereto, and means for rotatingthe rotor on the trunnion as set forth.

9. In a rotary pump or compressor the combination of a fixed trunnion having inlet and delivery ports therein, a single delivery passage and an inlet1 passage extending lon gitudinally vthrough the trunnion and communicating respectively Wlth the delivery and inlet ports, a non-return valve inthe detrunnion as the rotor rotates, a floating ring member rotatably carried in bearings. c ccen-` tric to .the trunnion and the rotor the lnner face of this ring member being operati/ve ing enclosing the ring member and the rotor and having aniinlet thereto, and means for rotating the rotor on the trunnion as set forth. A

l0. In a rotary pump or compressor the combination of a fixed trunnion having inlet .and delivery ports therein, a single delivery' passage and an inlet passage extending longitudinally through the trunnion and communicating respectively With the delivery and inlet ports, a non-return valve positioned in the delivery passage ,adjacent to that end which communicates With the delivery port, means for circulating Water through the trunnion, a rotor which is rotatably mounted on the trunnion and comprises .a plurality of radially disposed cylinders containing pistons, inlet and delivery ports in the heads of these cylinders adapted to register With the ports in the trunnion p as the rotor rotates, a ioating ring member rotatably carried in bearings eccentric to the trunnion andthe rotor the inner'face of this ring member being operative on the pistons in the cylinders, an outer casing enclosing the ring member and the rotor and having an inlet thereto, and means for rotating the rotor on the trunnion as set forth.

11. In a rotary pump or compressor the combination of a fixed trunnion having inlet land delivery ports therein, a delivery passage and an inlet passage in the trunnion the delivery passage extending longitudif nally through the trunnion from the delivery port with which it communicates to- Wards the fixed endof the trunnion and the inlet passage extending from the port with Which it communicates longitudinally through the trunnion in the opposite direction to the delivery passage, a non-return valve in the delivery passage, means for circulatin Water through the trunnion, a rotor Whlch is rotatably mounted on the trunf .les

nio and comprises .a plurality of radially disposed cylinders containing pistons, inlet and delivery ports in the heads of these cylinders adapted toregister with the ports 1n the trunnion as the rotor rotates, a floating ring member rotatablyvcarried in bearings eccentric to the trunnion and the rotor the inner face of this ring member being opera tive on the'pistons in the cylinders, an outer casing enclosing the ring member and the rotor and having an inlet thereto, and means for rotating the 'rotor on the trunnion as set forth.

12. In a rotary pump or compressor the combination of a fixed trunnion having inlet and delivery ports therein, a single delivery passage and an inlet passage 'extending longitudinally through the trunnion and communicating respectively with the delivery and inlet ports, a non-return valve positioned 'in the delivery passage adjacent to that end which communicates with the delivery port, a rotor rotatably carried by ball bearings on the trunnion the rotor comprising a plurallty of radially disposedcylinders containing pistons, inlet .and delivery ports" in the heads of'these cylinders adapted to register withythe ports in the trunnion as the rotor rotates, a liquid film between the interior of the rotor and-the exterior ofthe trunnion the rotor the inner face of this ring member being operative on the pistons lin the cylinders, an Outer casing enclosing the ring member and the rotor and having aninlet thereto, and means for rotating the rotor yon the trunnion as set forth.

13. In a rotary pumpor compressor the combination of a fixed trunnion having inlet and delivery ports therein, a single delivery passage and an inlet passage extending longitudinally through the trunnion and communicating respectively with the delivery and inlet ports, a non-return valve positioned in the delivery passage adjacent to that end which communicates With the delivery port, means for circulating Water ried by ball bearings on the tr nnion the rotor comprising a plurality of radially disposed cylinders containing pistons, inlet and" delivery ports in the heads ofthese cylinders adapted to register with the ports in the trunnion as the rotor rotates, a liquid film between the interior of the rotor and the exterior of the trunnion the film forming a seal for the ports in'these parts, a 'fioatirg ring member rotatably carried in bearings eccentric to the bearings and the rotor the inner face of this ring member being operative onthe pistons in the cylinders, an outer casing enclosing the ring member and the YYrotor and having-an inlet thereto, and means for rotating the rotor. on the trunnion as set forth.

14. In a rotary pump or compressor the combination of a fixed trunnion having inlet and delivery ports therein, a single delivery passage and an inlet passage extending longitudinally through thel trunnion andV communicating respectively with the delivsitioned inthe delivery passage adjacent to llU very and inlet ports, a non-return valve poi livery port, va rotor- Which is rotatably mounted on the trunnion and comprises a plurality of radially disposed cylinders-containing pistons the cylinders being mounted on a sleeve member which constitutes the heads of the cylinders, inlet and delivery ports in the sleeve member at the inner ends of the cylinders these ports being adapted to register with the ports in the trunnion as the rotor rotates, a floating ring member respectively with the inlet and delivery ports, a non-return valve in the delivery passage, means for7 circulating water through the trunnion, a roto-r which is vrotatably mounted on the trunnion and comprises a plurality of radially disposed cylinders con` taining pistons the cylinders being mounted on a sleevel member which constitutes the heads of the cylinders, inlet and delivery ports in the sleeve member at the inner ends of the cylinders these ports being adapted to register with the ports in the trunnion as the rotor rotates, a floating ring member rotatably carried in bearings eccentric to the trunnion and the rotor the inner face of this ring member being operative on the pistons in the cylinders, an outer casing en-I closing the ring member' and the rotor and having an inlet thereto, and means for rotating the rotor on the trunnion as setforth.

16. In a rotary pump or compressor the combination of a fixed trunnion having inlet and delivery ports therein, inlet and delivery passages extending through the trunnion and communicating respectively with the inlet and delivery ports, a non-return valve in the delivery passage, a rotor rotatably carried by ball bearings on the trunnion the. rotor comprising a plurality of radially disposed cylinders containing pistons the cylinders being mounted on a sleevevmember which constitutes the heads of the cylinders, inlet and delivery ports in the sleeve member at the inner ends ofthe cylinders these ports being adapted to register with lthe ports in the trunnion as the rotor rotates, aliquid film longitudinally' between the interior of the rotor and the exterior of the trunnion the film forming a seal for the ports in these parts, a floating ring member rotatably carried in bearings eccentric to the trunnion and the rotor the inner face of this ring member being operative on the pistons in the cylinders, an

outer casing enclosingthe ring member and with which it communicates towards the fixed end of the trunnion and the inlet passage extending from the port with which it communicates longitudinally through the trunnion in the opposite direction to the delivery passage, a non-return valve in the delivery passage, means for circulating water through the trunnion, a rotor rotatably carried by ball bearings on the trunnion the rotor comprising a plurality of radially disposed cylinders containing pistons the cylinders being mounted on asleeve member which 'constitutes the heads of the cylinders, inlet and delivery ports in the sleeve member at the inner ends of the cylinders these ports being adapted to register with the ports in the trunnion as the rotor rotates, a

liquid film between the interior of the rotor and the exterior o-f the trunnion the film forming a seal for the ports in these parts, a floating ring member rotatably carried in bearings eccentric to the trunnion and the 'rotor the.inner face of this ring member beingoperative on the pistons in the cylinders, an outer casing enclosing the ring member and the rotor and *having an inlet thereto, and means 'for rotating the rotor on the trunnion as set forth.

In testimony whereof I have signed my name to this specification.

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