US2288833A

US2288833A - Pump

Info

Publication number: US2288833A
Application number: US242966A
Authority: US
Inventors: William H Pascoe
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-11-29
Filing date: 1938-11-29
Publication date: 1942-07-07
Anticipated expiration: 1959-07-07

Description

July 7, 1942,. w. H. PAscoE 2,288,833

PUMP

Filed Nov. 29, 1958 Y s sheets-sheet 1 77 20, 77 4"; a i v4 72 7 l J4' 5 l| VAR/H615 //VT4/f i" A @brrr/76? 73 Z6 61 @57 ,Y 27 12 il 7 d; l' 7 f, j@ (5' 272 2j' i 2 I f il July 7, 1942.

W. H. PASCOE PUMP Filed Nov. 29, 1938 3 Sheets-Sheetr 2 July 7, 1942. w, H. PAscoE I 2,288,833

- Puur l l y Filed Nw. 29, 195e s sheets-sheet s lll! mi l Blu-I1" '.l

Patented July 7, 1942 UNITED STATE S PATENT OFFICE 9 Claims.

The invention relates generally to pumps, and more particularly to variable discharge metering pumps.

An important object ofthepresent invention is to provide a new and improved variable output metering pump capable of handling and accurately metering heavy fuel oils and like iluids.

Another object is to provide a pump oi this character having a new and improved and simplifled means for varying the metered output of the pump.

Other objects and advantages will become apparent from the following description, taken in connection with the accompanying drawings, in which:

Fig. l is a horizontal central sectional view taken through a pump embodying the features of the invention.

Fig. 2 is a framentary sectional view similar to Fig. l and illustrating the stroke adjustment in a different adjusted position.

Fig. 3 is a vertical sectional viewl taken along the line 3-3 oi' Fig. l.

Fig. 4 is a vertical sectional view taken along the line 4--4 of Fig. 1.

Fig. 5 is a vertical sectional view taken along the line 5-5 of Fig. i.

Fig. 6 is a vertical sectional view taken along the line 6 6 of Fig. 1.

Fig. 7 is a vertical sectional View taken along the line 1--1 of Fig. 1 and showing the stroke adjusting mechanism of the metering pump.

Fig. 8 and Fig. 9 are detail views showing the construction of the two piston assemblies of the device.

Fig. 1U is a central longitudinal sectional view of an alternative construction. Figs. 11 and 12 are sectional views taken along the lines II-II and I2-I2 respectively.

Fig. 13 is a detail perspective view of one of the actuating parts from the pump of Fig. 10.

Fig 14 is a perspective of one of the pistons from the pump of Fig. 10.

While the invention is susceptible of various modificationsA and alternative have shown in the drawings and will herein de scribe in detail, two preferred embodiments, but it is to be understood that I do not thereby. intend to limit the invention to the specific forms disclosed, but intend to and alternative construction falling within the spirit and scope of the invention as expressed in the appended claims.

In the form chosen for disclosure in Figs. 1 to 9 ofthe drawings the invention is. embodieds in constructions, I

cover all modifications XH a pump I0 having a low pressure or feed section I I and a high pressure metering section I2 whereby' a variably metered output may be obtained. As shown in Figs. 1 and 3, the pump I@ has a housing formed from three separably related sections or castings I3, Il and I5, these castings being generally cylindrical in form, as shown in Figs. 4 to '7. The central casting I4 has mounting flanges I8 thereon for securing the pump ID on a suitable foundation, and the two end castings I3 and I5 are secured to the ends of the central casting I4 by a series of longitudinal bolts I1 passing through suitably spaced bores I8 adjacent the periphery of the three` castings.

The present pump I0 has two pairs or sets o! pistons, making four pistons in a1l,and three of these pistons are employed as pumping or liquid displacing elements. Each of these three pistons is in the nature of a double acting pump, in

that in each pump cycle, each piston may act at both oi' its ends to perform .an intake and a discharge operation. `As hereinbefore stated, the pump I0 has two pairs of pistons, one pair comprising pistons and 2Iand being shown in detail in Fig, 9, while the other

pair comprising pistons

22 and 23 is shown in detail in Fig. 8. The two pistons of each pair are rigidly connected to each other as will be apparent from Figs. l, 8 and 9; each piston having a transverse bore 25 formed therein at its midpoint to receive a transverse connecting pin 23. The pistonpairs or sets are similarly associated, and hence only the set 2-2I will be described in detail. As shown in Figs. 1 and 9, the two pistons 20 and. 2| are placed in laterally spaced relation to each `other on opposite ends oi their connecting pin 26, and are keyed thereto by keys 21 and set screws 28 so as to be disposed at right angles to each other and to the pin 28.

The severalpistons 20,

2I

22 and 23 are mounted in

rotors

30, 3| and 33, the rotor 30 having a transverse bore or cylinder 34, open at both ends,

I and in which the piston 20 is reciprocable. Simi- Cai larly, the rotor 3| has transversely, diametrically positioned

cylinders

35 and 33, disposed at right angles to each other, and in which the pistons 2I and 22 are reciprocable. cally located cylinder 31 is formed in the rotor 23 to receive the piston 23. Since the piston sets each have one piston in the rotor 3l, and have their other pistons in the rotors and 33 respectively, a central clearance space or bore 38 is formed axially of the several rotors through which the connecting pins 23 extend with con- A similar diametrisiderable lateral clearance. The parts of the piston and rotor assemblies are so sized that flat end faces of the

rotors

30 and 33 bear slidably against opposite hat end faces ofthe rotor 3i. The assembly thus formed is mounted rotatably in the pump housing with the rotor 30 rotatable in a cylindrical bearing surface r chamber 40 in the housing section I5, the rotor 3| in a similar bearing chamber 4I in the housing section I4, and the rotor 33 in a cylindrical bearing 42 formed in a bearing block 43 within a chamber 44 in the housing section I3.

As shown in Figs. 1 and 3, this rotor 30 has a reduced axial bearing portion 45 keyed at 45 to a drive shaft 41, which shaft projects rotatably into a reduced end bearing 'portion 48 of the housing section I5. The bearing portion 45 of the rotor 3U runs in a bearing surface 49 of the section I5, and in a bearing collar 50 within said bearing surface 49, while the shaft 41 projects from the housing section I through a packing gland 5i.

Since each of the piston sets is made Yup of two pistons keyed to an intermediate connecting I pin, and since each pair or set has one piston mounted in the central rotor 3i, the drive shaft 41 serves to rotate the several rotors in unison, and in such rotation reciprocatory movement is imparted to the several pistons within their respective cylinders as will be explained. This end .is attained by laterally offsetting the adjacent bearing chambers or surfaces 40, 4I land 42, as will be evident from Fig. 1, or from a comparison of Figs. iV to '7. Thus, as shown in Fig. 1, Which is a plan sectional view, the central rotor 3l is positioned to rotate on an axis which is parallel to but is" offset laterally or horizontally from the axis of rotation of the two end rotors 3D and 33. Thus the plane of offset of the several rotors is in the present case a horizontal plane. Hence, when the several rotors are in the position shown in Figs. l, 2, and 4 to 7, the piston 2i in the central rotor 3| is maintained with its midpoint located on, the axis of the shaft 41 and the rotor with the result that the piston 2| is shifted to one end of its cylinder 35. This action will be apparent in Figs. l and 5.

As a general proposition it may be' stated that whenever one of the pistons of a set is perpendicular to the plane of offset of the rotors (that is, vertical in the present instance), it will be shifted to the midpoint of itisstroke, While the other piston of the set is shifted to one end of its cylinder just asthe piston 2i has been shifted in Figs. l and 5. Hence it will be clear that as the several rotors are turned in unison from the positions shown, the piston 2i will approach a vertical position, and as a result will, in a 90 rotor movement, shift to a mid-position, while shifting the piston 20 to one end 0f its cylinder. Continued movement of the rotors through another 90" will shift the piston ZI to the other end of its cylinder, which has now moved so as to be at the right hand side (Fig. 5) of the housing. Thus one end of the piston 2l will have moved through a suction stroke, while the other end thereof has moved through a discharge stroke, it being noted that the central clearance bore 38 is of a suihcient diameter to permit such lateral shifting of the connecting pins 26,'Whi1e being small enough to be inwardly of the piston-ends at all positions of the pistons.

To provide for the pumping of liquid during such piston movements, suitable inlet and outlet passages or chambers are formed for each of the several pumping pistons. Thus the housing section I5 has an arcuate intake chamber 20 and an arcuate outlet chamber 20 formed therein, opening through the surface 40 so as to register with the end of cylinder 34 during the intake and output movements respectively of the piston 2D. These chambers 20' and 20" are -of a width slightly less than the diameter of the cylinder 34, and are separated by lands or sealing members, and 6I bearing against the periphery of the rotor 30 and being continuations or parts 0f the bearing surface 40. These lands 60 and 6I are located at the same height so that the intake chamber extends from an intake pipe 62 across the upper side of the rotor 3|] to the land 6| on the opposite side of the axis 0f the rotor. Similarly, the outlet chamber 20 extends from the land 60 around the lower surface of the rotor 3i! to the land 6I to communicate withan outlet pipe 83.

Similar inlet andoutlet passages or chambers 2I and 2I.' are provided in the housing section I4 to register with the cylinder 35 of the piston TI, the chamber 2| being connected to the chamber 20 by a longitudinal bore 64, while the chamber 2I" is connected with the chamber 20 by a bore 65. Hence the two

cylinders

34 and 35 are supplied from the common intake pipe 52, and discharge into the common discharge pipe 53.

Generally similar inlet and

outlet chambers

22 and 22" are provided in the housing section I4 for the cylinder 36 of the metering piston 22. The inlet chamber 22 has a supply connection with the outlet pipe 63 of the other two pump cylinders, as by means of a pipe connection formed by a nipple 66, an elbow 61, and a nipple 38 threaded into one side of a T-tting 69, the bottom opening of the T-tting being connected to the outlet pipe 63. From the other side of the T-fltting a return line or pipe Ill extends to the supply tank. This return line includes, a constant pressure valve 1I so that the two pistons 23 and 2i serve to supply a constant excess supply of iiuid at a uniform or predetermined pressure to the metering section I2 of the pump. The metered output of the metering section i2 of the pump il) is discharged from'the outlet chamber 22 through a discharge pipe 12 connected to said chamber 22".

The pump I0 is, in accordance with the present invention, constructed so as to provide for convenient adjustment or variation of the metered output, and this adjustment may be accomplished during the normal operation of the pump. In the present embodimentl the adjustment covers a range from zero to the maximum output determined by the piston displacement at maximum stroke. To this end, in the embodiment of Figs. l to 9, the amount of eccentricity of the axis of the rotor 33 is varied, this being accomplished by transversely sluiting of the bearing block 43 in a direction parallel to the plane of offset of the rotors. To accomplish this purpose the present invention provides means for supporting and guiding the bearing block 43 in such movement, and for conveniently actuating the block 43 to obtain the desired metered output.

As shown in Figs. l, 2, 3 and 7 the supporting and guiding means comprises a pair of guide pins 15 projecting inwardly from the end wall 16 of the chamber 44, on opposite sides of the central axis thereof and in a horizontal'plane, and these pins extend into radial slots 11 formed in the adjacent face of the bearing block 43. The slots 11 terminate short of the central block 43.

The actuating or adjusting means as herein shown comprises an eccentric device 18 having an operating shaft 19 projecting through a reduced bearing hub 80 substantially centrally of the end of the housing section |3, there being a packing nut device 6| to prevent fluid leakage, and an operating means such as a radial handle 82 on the projecting end of the shaft 19.' The eccentric or actuating connection between the operating shaft 19 and the bearing block 43 is, in the preferred form; provided by a head 83 formed concentrically on the inner end of the shaft 19 and having an eccentrically located pin 84 projecting into a vertical slot 85 (Figs. 1 to 3 vand '7) formed in the adjacent surface of the` block 43.

With this 'adjustment mechanism the bearing block 43 may be shifted from its most eccentric position of Figs. 1 and '1 gradually to a less eccentric position as shown in Fig. 2, and if desired, may be shifted until its bearing surface 42 is concentric with the bearing surface 4|. When this concentric relationship is reached the metering piston 22 will remain stationary (in a longitudinal sense) within its cylinder 36, and the output will have reduced to zero. The adjustment of the metered output from zero'to maximum requires a 90 shifting of the control shaft 19.

Since the combined output of the two

pump cylinders

34 and 35 forming the supply section il exceeds the maximum output of the slightly larger metering cylinder 36, thereV is at all times an excess supply of iiuid under a predetermined pressure to fully charge the metering cylinder; and as Ya result,A the present pump I0. may be utilized to pump heavy viscous fiuids with an accurate and adjustable metering action.

In Figs. 10 to 14 there is illustrated an embodiment of the invention adapted to meter lighter and more easily handled liquids, This second embodiment has the same general adjustment means for varying the metered output, and is arranged to deliver the metered uid with a much less variation or uctuation in the output line pressure. As shown in Fig; 10, this second embodiment of the invention comprises a pump 90 with separabiy related housing sections 9| and 92 secured together in face to face relation by laterally spaced longitudinal bolts 93 disposed adjacent the periphery of the sections. The section 92 houses a rotor 94 in a rotor bearing Ysurface or chamber 95 formed in the section 92, and the rotorV 94 has an axial hub 96 at one end projecting into an end bearing 91 formed on the section 92. Within the end bearing 91 the hub 96 is keyed to a drive shaft 98 which projects from the bearing 91 through a packing gland structure 99.

As shown in Fig. l0, the rotor 94 and its chamber 95 extend to the inside face |00 of the housing section 92, so that the left hand face 92 (Fig. 10) of the rotor bears against the adjacent face |0| of a bearing member |02. The bearing member |02 is mounted within a chamber |03 in the housing section 9 i.

The rotor 94 is, in the present instance, formed to provide cylinders |95 for three pistons |06, and these pistons are actuated during rotation of the rotor 94 through the medium of an operative connection Within the bearing member |02. The pistons |06 are preferably of rectangular cross section as shown in Fig. 14, and the cylinders |05 are correspondingly formed as rectangular slots radially positioned in the end surface 92' of the rotor and extending or opening through the peripheral surface of the rotor. The relationship is such that the left hand surface (Fig. 10) of each piston is flush with the surface 92' and runs in contact with the surface |0| of the bearing member |02.

Inlet and outlet chambers ||0 and are provided in the housing section92, separated by lands ||2 and ||3 in much the same manner as in the Fig, 6 illustration of the other embodiment. An intake pipe i4 is connected to the intake chamber ||0, while a discharge pipe H5, having a constant pressure valve ||6 therein, is connected to the outlet chamber The operative connection between the piston |06 and the bearing block |02 is provided by an annular groove or slot |20 formed in the face |0| of the bearing block |02. bearing member ornsregrnent |2| is positioned for each piston |06, and each piston has a pin |22 fixed there'n and projecting into a socket |23 formed in the associated bearing segment |2|. Thus when the bearing block |02 is positioned so that the groove |20 is eccentric with relation to the axis of the rotor 94, and is held against rotation, this rotative movement of the rotor will cause the pistons |06 to be reciprocated through identical pumping strikes the length of which depends upon the amount of such eccentricity.

The present invention provides for adjustment of the metered output, and hence the bearing member |02 is adjustably mounted in much the same manner as the member 23 of the pump I0.

Thus the member |02 has two radial guide slots 11' extending horizontally in its left hand surface (Fig. 10)and-engaged'bylguidepins 15 fixed in the end wall 16 of the chamber |03. This structure guides the member |02 for transverse horizontalY adjustment so that the eccentricity of the groove |20 with relation. Vto Ythe rotor may be varied. Y

a vertical grooveY 05! is form'e'drfer` engagement by a pin 04 projectin'g'eccentrically and inav lon A- gitudinal direction from a rotatable head 83.

Vjecting end.

I claim as my invention:

l. A device of the character described comprising, in combination, a pump housing, a pair of rotors mounted in said housing in endwise abutment with each other, each of said rotors having a diametrically positioned guideway formed therein, a pair of pistons, one reciprocable in each guideway, means rigidly connecting said pistons in right angle relation tov each other` one of said pistons and its guideway constituting a metering pump, and said housing being formed .,o provide inlet and outlet passages and supporting bearing surfaces for the rotor of said metering pump, a bearing member mounted in said housing and supporting the other rotor, bearing means supporting said bearing member for shifting movement to vary the transverse relationship of said bearing member to the rotor of the mete:- ing pump, and means for actuating said bearing member to various adjusted positions to vary the metered output of said metering pump.

In this groove a In the 'same surfaceofuth bearing/member |02-1j 2. A device of the character described comprising, in combination, a pump housing, a pair of rotors mounted in said housing in endvvise abutment with each other, each of said rotors having a diametrically positioned guideway formed therein, a pair of slide members, one reciprocable in each guideway, means rigidly connesting said members in right angle relation to each other, one of said members and its guideway constituting a metering pump, and said housing being formed to provide inlet and outlet passages and supporting bearing surfaces for the rotor of said metering pump, a bearing member mounted in said 'housing and supporting the other rotor, and bearing means supporting said bearing member for shifting movement to vary the transverse relationship of `said bearing member to the rotor of the metering pump.

3. A device as defined in claim 2 having means for actuating said bearing member to various adjusted positions comprising an eccentric pin and slot means connected to said bearing member within said housing, a rotatable actuating shaft i and having an axial bore intersecting said cylinder, a piston reciprocable in said cylinder, an actuating arm xed to said'piston intermediate its ends and extending at right vangles to the piston through said bore out of said rotor, an elongated actuating slide member fixed to said arm at right angles to said arm and to said piston, an actuating rotor within said housing havingan axial bore and an intersecting guideway formed along a diameter thereof to slidably receive said slide member, a stator bearing member within lsaid housing for said actuating rotor, means supporting said bearing member for movement transversely of the axis of said main rotor to vary the eccentricity of said bearing member with respect to the axis of the "main rotor, and means operable exteriorly of said housing for adjusting said bearing member.

5. A pump of the character described, comprising, in combination, a housing providing a cylindrical rotor-chamber, an inlet and an outlet, said chamber being formed with peripheral intake and outlet grooves connected to said intake and outlet respectively and separated by lands formed in said casing at diametrically opposite points, a main rotor in said chamber having a diametrically arranged cylinder extending therethrough and having an axial bore intersecting said cylinder, a piston reciprocable in said cylinder, an actuating arm fixed to said piston intermediate its ends and extending at right angles to the piston through said bore out of said rotor, an elongated actuating slide member fixed to said arm at right angles to said arm and to. said piston, an actuating rotor Within said housing having a guideway formed along a diameter thereof to slidably receive said slide member beyond the adjacent end of said main rotor, a stator bearing member within said housing for said actuating rotor, means supporting said bearing member for movement transversely of the axis of said main rotor to vary the eccentricity of said bearing member with respect to the axis of the main rotor, and means for adjusting said bearing member.

6. A rotary pump comprising, in combination, a housing providing a rst rotor chamber having inlet and outlet slots about its periphery separated by lands, a rotor in said chamber having a diametric cylinder therein communicating at its ends with said slots, a piston in said cylinder, means extending through the adjacent end of said housing for driving said rotor, said housing having second chamber adjacent its other end, a bearing member in said second chamber having a rotor bearing surface formed therein, a second rotor in said bearingsurface having a. diametric guideway therein, an elongated slide member in said guideway, a means rigidly connecting said piston to said slide member in a right angle relation thereto, and means supporting and guiding said rbearing member for adjustment transversely of said rst rotor axis to vary the relation oi the axes of said rotors.

7. A rotary pump comprising a housing having a pair of rotor chambers located adjacent each end and a central rotor chamber located between said end chambers and eccentrically positioned with relation thereto, a drive shaft projecting axially into one of said end chambers and having a rotor xed thereto, said rotor having a diametric cylinder formed therein, a central rotor mounted in said central chamber and having two diametic cylinders formed therein in spaced relation longitudinally of said central rotor and at right angles to each other, a third rotor mounted in the other end chamber and having a diametric cylinder formed therein, all of said rotors having axial bores formed therein intersecting said cylinders, pistons in all of said cylinders, means located in said axial bores rigidly connecting each of the pistons of said central rotor to the piston in the adjacent one of the end rotors so that the connected pistons are rigidly held in right angle relation to each other, and said housing being formed to provide inlet and outlet passages communicating with@l plurality of said cylinders.

8. A rotary pump comprising a housing having a pair of rotor chambers located adjacent each end and a central rotor chamber located between said end chambers and eccentrically positioned with relation thereto, a drive shaft projecting axially into one of said end chambers and having a rotor xed thereto, said rotor having a diametric cylinder formed therein, a central rotor mounted in said central chamber and having two diametric cylinders formed therein in spaced relation longitudinally of said central rotor and at right angles to each other, a third rotor mounted in the other end chamber and having a diametric cylinder formed therein, all of said rotors having axial bores formed therein intersecting said cylinders, pistons in all of said cylinders, means located in said axial bores rigidly connecting each of the pistons of said central rotor to the piston in the adjacent one of the end rotors s0 that the connectedA pistons are rigidly held in right angle relation to each other, said housing being formed to provide common inlet passages and common outlet passages for the cylinder oi said rst rotor and for the adjacent cylinder of said central rotor, said housing being formed to provide inlet and outlet passages for the other cylinder of said central rotor, a return line connected to said common outlet passage and having a constant pressure valve therein, a connection from said return line between said valve and said common outlet passage to said inlet passage of said other cylinder of said central rotor, and means 5 for adjusting the eccentricity of said third rotor with. relation to said central rotor.

9. A device of the character described comprising, in combination, a pump housing, a rotor mounted within said housing adjacent one end l0 thereof, said rotor having a radially extending cylinder formed therein, a piston reciprocable in said cylinder, said housing being formed to provide inlet and outlet passages for said cylinder and supporting bearing surfaces for said rotor. a bearing member mounted in said housing and having an annular bearing surface formed therel5 said actuating shaft.

in, means running on said annular bearing surface having an operative connection with said piston for reciprocating the same during rotation of said rotor, bearing means supporting said bearing member for shifting movement to vary the relation of said annular bearing surface to said rotor from a concentric to an eccentric relation, and means for actuating said bearing member to various adjusted positions comprising an eccentric pin and slot means connected to said bearing member within said housing, a rotatable actuating shaft for said pin and slot means projecting from said housing. and a pafcking gland structure forming a seal between said housing and H. PASCOE.