US1720577A - Rotary pump machine - Google Patents

Rotary pump machine Download PDF

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Publication number
US1720577A
US1720577A US182042A US18204227A US1720577A US 1720577 A US1720577 A US 1720577A US 182042 A US182042 A US 182042A US 18204227 A US18204227 A US 18204227A US 1720577 A US1720577 A US 1720577A
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United States
Prior art keywords
slots
vane
casing
blades
rib
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Expired - Lifetime
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US182042A
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English (en)
Inventor
Stern William Joe
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POWERPLUS Ltd
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POWERPLUS Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/352—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the vanes being pivoted on the axis of the outer member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C18/352—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the vanes being pivoted on the axis of the outer member

Definitions

  • This .invention comprises improvements in and connected with rotary pump machines and is concerned with pump machines of the co-called crescent chamber class.
  • the piston or rotor is an eccentrically mounted body formed with spaced slots for vanes to work in,k these slots being in some cases fitted with oscillatory trunnion blocks formed with slots in which the vanes have a sliding movement relative to the rotor.
  • it is generally ad Vantageous to drive the rotor, the vanes being engaged with centric means such as a lay shaft.
  • the object of the present invention is to lighten the construction of the vanes while at the same time enabling them to withstand various stresses to which they are subjected in the operation of these machines, for it is of the utmost importance to have vanes of the lightest possible construction so as to rcduce friction losses.
  • the vane blades are provided on each face with a series of ribs of small thickness but of relatively great depth so as to resist bending of the blade, the ribs being also adapted, if desired, to take up centrifugal stresses.
  • the ribs are advantageously constituted by thin metal plates which may be slot-ted centrally to tit on to the blades and be formed with base or ring portions for operatively connecting them with the centric means.
  • Figure 1 is a transverse sectional elevation of a rotary compressor embodying improvements in accordance with this invention.
  • Figure 2 is an irregular longitudinal section of the compressor, taken on the line II-II of Figure l.
  • Figure 3 is an elevation of a piston vane assemblage
  • Figure 4 is a sectional side elevation of Figure 3.
  • Figure 5 is a plan view of a suitable form of oscillatory trunnion block for use with the piston varies.
  • Figure 6 is a cross-sectionon the line VI--VI of Figure'.
  • Figure 7 is a perspective view illustrating a modilied form of piston vane assemblage.
  • Figure 8 is a perspective view of a moditied construction of vane rib.
  • a Figure 9 is a fragmentary sectional view, illustrating the practical application ofthe form of vane rib shown in Figure 8, and
  • Figure 10 is a Iplan section of a trunnion rocker and Ivane blade showing the application ot intermediate bearing members as hereinafter referred to.
  • a is the outer casing of the compressor formed with inlet and eX- haust ports or ducts b and c respectively and d is the piston bodyor rotor mounted eccentricall in the outer casing upon ball bearings e an f.
  • g is the rotor shaft which runs in the bearing e and is driven from the power shaft It through a coupling z'.
  • the bearing f is supported by a hollow shaft or sleeve j with flange at one end for securing it in the casing a.
  • Z is a stub shaft which may be secured'iin one end of the rotor in alignment with the rotor shaft g, this stub extending through the sleeve j and being revolubly supported at the other end by a ball bearing m mounted in the casing a.
  • a supporting member a for the inner race of a ball bearing o which constitutes a centric revoluble bearing for the piston varies p of the machine.
  • a screw g may be provided as an additional securing means for the member n, and the vanes p, as is usual in these machines, have sliding en, gagement with the slots of cylindrical roclfr-y ers or trunnion blocks such as 1' mounted in longitudinal recesses or slots s -in the rotor body and revolubly supported at the ends in ball bearings t in the ends of the rotor.
  • the machine illustrated in Figures 1 and 2 has four piston varies but there may be only two or any other desired number greater than two.
  • the rib members u which are fitted to the vane blades in accordance with this nvention suitably consist of thin metal plates, which may be steel stampings of a size 3/8 x .104 in tranverse section for a vane blade of .064 thickness.
  • a vane blade is marked lv
  • these rib plates are advantageously in the form somewhat of an inverted T, so as to provide a base part or foot ⁇ u.
  • the rib plates are used on the vane blades in pairs.
  • each blade in igures l to 4 Only one pair is used for each blade in igures l to 4, and each pair is secured one on each side of a. vane foot member w by means of screws a: passing through the foot or base u of the plates.
  • the vane feet w comprise arcuate parts y for engaging the inner periphery of a. blade ring e in the manner hereinafter described.
  • the rib plates u are slotted as at 1 for the reception of the vane blades.
  • the slots 1 are slightly longer than the radial width of the yvane blades and that the slots extend from apoint on a level with the top or outer surface of the arcuate parts y of the vane feet to a point situated at a short distance from the outer extremity ef the rib plates.
  • the vane blades are notched as at 2 at points spaced apart a distance equal to the distance between the rib plates and it will be seen that a vane blade may have the rib yplates applied thereto by passing same through the slots 1 of the plates until the notches 2 come into line with the rib plates.
  • the vane blades can be moved 0utwardly, so that the solid portions 3 at the extremities of the rib plates are engaged with the notches2, and when the rib plates have been screwed to the vane feet, upon tightening a grub screw 4 in the vane foot, the blade is heldiirmly in position in the rib plates which thus vserve effectively as blade supports or cradles.
  • the vanes are engaged in the slots of the rockers 7 of the rotor and the vane feet are engagez? with slots in the bladering e aforesaid as will be described.
  • the oscillatory cylindrical trunnion blocks may be made in halvesfthat is divided longitudinally, as seen for example in Figures 5 and 6, and held together by ferrules, caps or equivalent devices at the ends or by their spigot ends 5 engaging with the inner races ot the ball bearings t aforesaid as shown in Figure 2.
  • The'slots 6 of the trunnion blocks are enlarged at the places where the rib members u pass through and preferably the enlargements are made long enough to extend over a pair of rib members as seen by way of example at 7 in Figure 5.
  • the interior of the blade ring z may be supplied with lubricant through a duct 14 and the blade feet may have ducts 15 formed therein to allow lubricant to pass under the action of centrifugal force to the channels between the rib plates u and so to the rocking .bearing members 8 in the trunnion blocks r.
  • the vane feet A are of sufficient dimensions to overlap the slots 10 in the blade ring .e and in conjunction with the outer race of the ball bearing 0 prevent escape of lubricant through these slots.
  • the bearing pads 8 can be allowed to bear on them direct as shown Aand the combination of each pair of rib plates with the blade portion between the members of each pair constitutes a sort of H girder forming a modified construction of thrust member of the nature hereinbefore referred to. Should the vane blades 'be of material unsuitable for bearing purposes, bearing plates may be inserted between the bearing pads 8 and the blades are passed into T form slots 10 in the.
  • the rib plates will prevent any bending of the vane under the peculiar stresses to which the vanes are subjected in this type of machine, while at the same time they will also take up the bearing pressures of the vanes upon the bearing pads 8 under the accelerative and decelerative action of the vanes. Furthermore the rib plates restrain the vane blades against centrifugal stresses which are taken up by the blade ring z through the vane feet.
  • the blade ring in conjunction with the arcuate parts of the vane feet, oder a space on either Iside of the ball bearing o constituting a common centre from which lubricant can be nion blocks.
  • FIG. 7 The modification illustrated in Figure 7 is suitable for adoption in the case of blowers or other rotary pump machines of relatively great length. nly part of thevane assemblage is shown and it will be seen that the rib plates 16, in this case, have their feet perforated forv engagement with rods 17 extending between a pair of vane feet, one only of which is shown at 18.
  • the vane blades 19 are of similar construction to those previously described, but the slots in the rib plates terminate at the inner end in screw threaded holes adapted to receive grub-screws 20 for retaining the blades in position.
  • rib plates are disposed along the blades in pairs with suitable intervals betweenv the pairs (as in Figure 10 for example) and the vane feet have arcuate parts 21 adapted to engage in Vthe known grooved rings'revoluble on ball-4 bearings mounted centrically in the pump casing, as shown for example in Figure 1 of the drawings of my Patent No. 1,616.285.
  • Distancing sleeves 22 may be employed for spacing apart the inner ends of the rib plates upon the rods 17.
  • rib member shown in Figure 8 is applicable for use. in cases where the vanes revolve about a sleeve or shaft mounted centrically in the outer casing. as disclosed for instance in my prior Patent No. 1.616,285.
  • the feet of the rib plates 22 in this construction are in the form of ringshaped parts 23, adapted to encircle the sleeve or shaft.
  • the plates are used in pairs as shown in Figure 9 and when the vanes arepto be mounted to revolve onball bearings on a centric shaft one rib plate is pinned or otherwise secured on each side of the outer race of a ball bearing 24 mounted on the shaft which tance between the outer surfaces of each pair of ribplates.
  • t-he spacing between the thin metal rib plates may be determined by suitable distance pieces which mav also be adapted to form a sealing tip as will be understood without further description.
  • Figure 10 shows how the rib plates marked 27, lmay be arranged in pairs along the length of a long blade 19 as hereinbefore referred to.
  • This figure also disclosesthe provision between the different pairs of rib plates of intermediate bearing pads 8a.
  • the use of these intermediate pads may sometimes be ⁇ advisable in the case of very long blades and they may be arranged so as to-come into operation only in thel case of emergency, that is to say, if the vane blades bend unduly. Y.
  • a rotary pump machine comprising a' casing, a piston body mounted eccentrically in said casing, centric means in said casing, vane blades arranged in ⁇ slots of said piston body and engaged with said centric means, rib members of small thickness and relatively great depth disposed on said blades to resist bending thereof andhaving a running clearance in saidslots, and bearing surfaces for the ,blades in said slots in the vicinity of said 'rib members, substantially as set forth.
  • a rotary pum machine comprising a casing, a piston bo y mounted eccentrically in said casing, centric means -in said casing, vane blades arranged in slots of said piston body and engaged with said centric means,
  • a rotary pum machine comprising a casing. a piston bo y mounted eccentrically in said casing, cent-ric means in said casing, vane blades arranged in slots of said piston body and engaged with said centric means,
  • rib members fitted on saidvblades and comprising thin metal plates slotted centrally to t on to the blades said rib members having a running clearance in said slots and bearcasing, a piston' body mounted eccentrically in said casing,centr1c means in said casing, vane blades arranged in slots of said piston body and engaged with said centric means and having spaced notches in their outer edge,
  • rib members fitted on said, blades and comprising thin metal plates slotted to fit over the blades but having an unslotted part at their outer extremity to engage in said notches of the blades, said rib members having a running clearance in said slots and bearing surfaces for the blades in said slots in the vicinity of said rib members, substantially as set forth.
  • a rotary pump machine comprising a Casin a cylindrical rotor mounted eccentrical y in said casing, vane blades arranged in slots of said rotor, centricmeans in said casing, rib members of small thickness and relatively great depth disposed on said blades to resist bending ⁇ thereof, and adapted for connection'to said centric means, said rib members having av running clearance in said slots and bearing surfaces for the blades in said slots in the vicinity of said rib members, substantially as set forth.
  • a rotary pump machine comprising in combination a casing, a cylindrical rotor mounted eccentrically in said casing, vane blades arranged in slots of said rotor, rib members of thin metal plate disposed on said blades to resist bending thereof, and having base'portions at their inner extremity, vane feet operatively connected With said base portions, a ring revoluble centrically in said casing and adapted for operative engagement with said vane feet, said rib members having a running clearance in said slots, and bearngsurfaces for the blades in said slots in the vicinity of said rib members, substantially as set forth.
  • a rotary pump machine comprising a casing, a cylindrical rotor mounted eccentrically in said casing, vane blades arranged in slots of said rotor, vane feet comprising' arcuate parts, rib members fitted on said blades to resist bendin thereof and constructed for connection with said vane feet, a blade ring member centrically mounted in said casing and formed with circumferentially spaced slots for engagement with the respective vane feet which are retained by said arcuate parts thereof, and means for positively driving said ring member at rotor speed, substantially as set forth.
  • a rotary pump machine comprising a casing, a cylindrical rotor mounted eccentrically in said casing, vane blades arranged in slotsof said rotor, a blade ring member centrically mounted in saidcasing, andl formed with circumferentially spaced slots, and means for positively driving said ringmemberv at rotor speed, vane feet engaged with the slots of said ring member and comprising arcuate parts 0f .Such dimensions as to overlap the slot openings circumf-"rentially, and rib members fitted on said bladfs to resist bending thereof and constructed for connection with said vane feet, substantially as set forth.
  • a rotary pump machine comprising a casing, a Cylindrical rotormounted eccentrically in said casing, vane blades arranged in slots of said rotor, a blade ring member with circumferentially spaced slots centrically mounted in said casing on an anti-friction bearing device, means for driving said ring member at rotor speed, vane feet of saddle form to straddle said bearing device and comprising arcuate parts for engaging said ring member at the slots thereof, and rib members fitted on said blades to resist bending thereof and constructed for connection with said vane feet, substantially as set forth.
  • a rotary pump machine comprising a casing, a piston body mounted eccentrically in said casing, centric means in said casing, vane blades arranged in slots of said piston body and operatively connected with'said centric means, rib members dis osed in pairs on said blades, and individual bearing members of rocking pad type, disposed in the rotor slots between the members of each pair of rib members, substantially as set forth.
  • a rotary pump ,machine comprising a casing, a piston body mounted eccentrically in in pairs on said blades and individual bearl ing members of rocking pad type, disposed in 'the slots of said bearing blocks between the members of each pair of rib members, substantially as set forth.
  • a rotary pump machine comprising a casing, a piston body mounted eccentrically in said casing, vane blades arranged in slots in said piston body, and individual rocking bearing members of short length arranged at isolated points in said slots to provide bearing surfaces for the vanes only at selected points of their length.
  • a rotary pump machine comprising a casing, a piston body mounted eccentrically in said casing, centric means in said casing, rocking bearin blocks arranged in slots of said piston bod vane blades arranged in slots of said bearing blocks and operatively connected with said centric means, rib members disposed in pairs on said blades, rocking bearing members disposed in the slots of said bearing blocks between the members of each pair of rib members, and additional rocking bearing members disposed in the slots of said bearing blocks intermediately between respective pairs of rib members, substantially as set forth.
  • a rotary pump machine comprising a cylindrical casing, a vcylindrical rotor mounted eccentrically in said Casing, Cylindrical rocking bearing blocks mounted in slots of saidv rotor, a slotted blade ring member mounted to revolve Centrieally on anti-friction bearings in said casing, vane blades arranged in slots of said rocking bearing blocks, rib members of thin metal plate arranged in pairs on said vane blades to resist bending thereof, vane feet connected with said rib members and comprising arcuate parts adapted to engage said blade ring member and of such dimensions as to overlap the slots thereof, and rocking bearing members disposed in the slots of said bearing blocks between the members of each pair of ribV members, ducts being formed in said Vane feet leading from the space within the blade ring member to the channel between the members of each pair of rib members, substantially as set forth.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Reciprocating Pumps (AREA)
US182042A 1926-04-24 1927-04-08 Rotary pump machine Expired - Lifetime US1720577A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470656A (en) * 1945-07-27 1949-05-17 Shorrock Christopher Sliding vane rotary compressor
US2638054A (en) * 1947-12-27 1953-05-12 Vernon O Hartz Variable fluid drive mechanism
US2678155A (en) * 1948-05-25 1954-05-11 Durmorstan Company Inc Compressor-expander
US3180562A (en) * 1962-10-29 1965-04-27 Curtiss Wright Corp Seals for rotary mechanisms
US3437265A (en) * 1968-06-03 1969-04-08 Gen Motors Corp Vane-type rotary mechanism

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470656A (en) * 1945-07-27 1949-05-17 Shorrock Christopher Sliding vane rotary compressor
US2638054A (en) * 1947-12-27 1953-05-12 Vernon O Hartz Variable fluid drive mechanism
US2678155A (en) * 1948-05-25 1954-05-11 Durmorstan Company Inc Compressor-expander
US3180562A (en) * 1962-10-29 1965-04-27 Curtiss Wright Corp Seals for rotary mechanisms
US3437265A (en) * 1968-06-03 1969-04-08 Gen Motors Corp Vane-type rotary mechanism

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DE522341C (de) 1931-04-13

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