US2596647A - Outlet guiding arrangement - Google Patents

Outlet guiding arrangement Download PDF

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Publication number
US2596647A
US2596647A US251742A US25174251A US2596647A US 2596647 A US2596647 A US 2596647A US 251742 A US251742 A US 251742A US 25174251 A US25174251 A US 25174251A US 2596647 A US2596647 A US 2596647A
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United States
Prior art keywords
scroll
diffuser
wall
blower
arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US251742A
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English (en)
Inventor
Buchi Alfred
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Individual
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • 'It is aifurther objectzto'providei'aidevicewhichl substantial tangentiahcomponentfis: captured;rits: mayreasily becdiecastin sections and :theneaiter; velocity-converted:into-"pressure, and the fluid: putitogethen' guideictintmoneior more: streams-of, desired: definefluid velocity into pressure before.-i'the *flui'dsl streams are deflected toward the laterally; offset scrollispacejthereby to.reduce.iflow.losses;
  • the: apparatus hereafterdest'zribescl'liin which is; guidetductarrangementt effectra smoothrand: 20.:sho'wn:in'* shock'efree: flowv of the "pressures fluid within a: Fig-'1, an axiallsectionithrough a;single minimum; passage length and; such is .1 a; primary"; blowen: taken on'the" line;I-*I,;of:1i?ig.:2 i object; of;.'1nyvinvention-: Fig:2,:an-raxial.view':of. theqblower'shownin In my; aforementioned.
  • Fig'5213-5 axial sectionsjthrough the rim: pore accordingftoxsmy present invention-g by dispose 40 embodiment-3" having :twor separate: discharge;
  • FIG. 9 LandFigi-LlO, an embodiment: of my invent thidifiUSGtiiOlltlGtS thatrta:;portioniofl each; dii'i-1.-' fuser outletieross :sectionf" preferably notfmore; tion in aimultistage blowe'n'fFigz 19 .heing2an1'axiil' than oneeh'alf; lies .inz'thetscioll space; andrfurL-n.
  • blower intake The two portions are detachably secured together by means, such as bolts 28'.
  • About the periphery of the blower disc I, I preferably provide an annular clearance gap in in which the pressure fluid is received from the blading la.
  • Leading off from this gap l are a series of openings II into which the fluid is passed.
  • Each of these openings ll communicates with a guide duct diffuser arrangement 6 having its axis lying substantially in a plane IIII (Fig. 1) normal to the blower axis.
  • the diffuser arrangement is constituted of a first rectilinear portion I3 and a second curvilinear portion 14.
  • the latter opens at 1 into a scroll space 8a defined by the scroll case portion 8 of the blower casing.
  • This scroll space 8a is laterally offset relative to diffuser arrangement 6, and is further provided with a pressure header 9 into which the fluid stream moves after it has been collected in the scroll space 8a from each of the diffuser outlets 1.
  • the character l2 denotes a cylindrical port of entry to the rectilinear diffuser I3 which I preferably include to reduce vortex action.
  • the pressure fluid flows through the rectilinear diffuser portions I3, it passes through the transitional area, points of which are indicated by It and I1, and thence through the guide-passage portions l5.
  • the latter having no defining walls beyond 1 on the side of the scroll space 8a, the pressure fluid streams simply merging with and becoming a part of the streams collected from preceding guide duct passages and moving in the scroll space 8a toward the pressure header 9.
  • each guide passage portion 15 is defined by a deflecting wall [5a which commences as an extension of the wall Ma (defining the curvilinear diffuser portion) and curves axially of the blower towards the scroll space 8a concavely with respect to the plane IIII which is normal to the blower axis and in which lie the axes of the diffuser arrangements 6.
  • This curved wall 15a curves gently to deflect the fluid stream issuing from the diffuser portions 14, into the scroll space 8a where it joins with minimum turbulence and impact, the streams previously collected and moving in the scroll space 8a.
  • the portion 15b of the wall l5a which is radially outermost of the blower is brought adjacent the radially outermost portion 8b of the scroll casing 8.
  • the portion 8b is flattened and extended axially of the blower to meet [5b beginning at the points of transition Moreover, I also shape the inner portion 8c of the wall of scroll casing which is adjacent the guide duct arrangement 6 so that it merges with the inner portion 150 of the duct defining wall 15a, which is radially innermost of the blower axis, beginning at the points of transition 16, I1.
  • blower housing sections 4, 5 and guide duct diffuser defining walls 13a, [4a are preferably integrated with the scroll casing 8, is illustrated in the several sections of Figs. 3, 4 and 5. From these sections it will'be seen that, in order to keep the pressure fluid moving in the scroll case at substantially the same speed as it is moving from the several curved guide duct diffuser outlets in accordance with one of the prime principles of my invention, it is necessary to maintain at least constant the cross sectional areas of the scroll space where each succeeding diffuser. arrangement approaches the radially outer scroll space portion into which the pressure fluid is discharged as heretofore described. Moreover, to accomplish the object of maintaining constant speed of the fluid throughout the whole extent of the scroll space, it will be seen from Figs. 1, 2 and '7 that I provide a predetermined increase in the cross-sectional areas of the scroll space as the stream from each diffuser joins the streams previously collected therein.
  • the pressure header 9 into which the collected pressure fluid streams pass from the scroll space may be constructed either as a diffuser-like header E8 or as a parallel wall l8 (shown by dash-and-dot lines in Fig. 2), depending upon whether it is desired to effect a further conversion of the fluid velocity into pressure or to maintain the pressure heretofore created by the difiuser ducts.
  • I preferably arrange one guiding passage ll, I2, 13" and 14" to constitute the origin of the scroll space, and at least the last of the succeding guiding passages ll", l2", l3", l4" (emptying into the same header) to open directly into the header 9 in a substantially identical discharge direction.
  • vanes I41 may each be constituted of two sections Mia, I411), one section being disposed in each half of the duct defining wall Ma, and the two sections l4la, l41b being constructed to join with each other in the plane of separation.
  • my guide duct arrangement and scroll casing are constructed of at least two sections 4, 5 divided by and intended to be brought together along a plane IIII substantially normal to the rotor axis as shown in Fig. 1.
  • bolts 20 serve to secure together these two sections.
  • these bolts 20 or other screw connections be disposed in the areas I 9 between the guide ducts, which areas have a substantial extent radially of the blower axis. Such'disposition of the bolting 20 insures a good juncture of the two sections 4, 5.
  • the guide passage scroll case arrangement of my invention may also be constructed of. three imm ithcdimentssectien r 415:; registry, form the blower dis hops monster; 8" whcnpronerhc J. V. IlQdi; constitutezt eg dischargaexitsanokscrollspacadisp se V. m ito myinventioni: Thcsadvanta ao ,thisz segtinnal construction; isthatall.
  • the 1 passage 'portionl 5 should preferably be-so dimensioned:asto-smaintain over its entire cross sec tion: themsame. velocity as vprevails in the cross as section I of the outlet of the curvilinear diffuser: portion; 14;: Moreover; theinflection; commencing at; the; point; 24 shouldbe: givenavradius. of J cur-l. vaturezof such' length lassto decreaseethei transb a tional elosses whichnormallyawould: arise the:. fluid; moves; through passage ,portionr.
  • lf-- designate that fourzrunners; keyed w'ontoithe shaftrznwhich shaft turnsj'withimthmbearings and 33, Thejsuctiorr-intake jadesignatedz-byei and the pressure header by l8. It willbe;notech frorm Eiga-'lmthat.fivexguiderpassagesarei provided.
  • a p rtion efin n ias r ll spa e, sai 5 at "least art a at ally 'ofis tfrqm, ed ubs an a aral e o a ap neash 1 portion further partially; cleanin the, ,duiusen tlets; said Out ets ex din at least partia1-1y. into said scroll sbace and being directedsubstari tially parallel withthe direction of fi'oyv. in the; scroll space, said, casing portion. further including, a a deflecting wall for each diifuser, sjeuld;wall:v e.-.
  • an outlet guiding arrangement for delivering pressure fluid from said rotor comprising a plurality of rectilinear difiusers disposed within said casing radially beyond the rotor blading, the axes of said diflusers lying approximately in a plane normal to the rotor axis, a curvilinear diffuser communicating with each rectilinear diffuser through which curvilinear diffuser said fluid is further passed, the axis of each said curvilinear diffuser also lying substantially in said plane, said casing having a portion defining a scroll space, said space being at least substantially parallel to said plane, said casing portion further partially defining the diffuser outlets, said outlets extending at least partially into said scroll space and being directed substantially parallel with the direction of flow in the scroll space, said casing portion further including a deflecting wall for each diffuser, said wall beginning at that side, most
  • said housing further including a deflecting wall for each curvilinear diffuser, said wall beginning at that side, most remote from the central area of the scroll space, of the discharge orifice of such diffuser and curving at least partially axially of the blower and concavely with respect to said plane into the scroll space to form, adjacent to the radially outer housing wall, deflected passages extending from 7 each said curvilinear diffuser discharge orifice on the side of said plane opposite from said scroll space, into said scroll space, whereby the pressure fluid is directed smoothly over a surface portion of the outer wall of each 8.. preceding diffuser guide-duct and peripherally over an are having a large radius of curvature, into the scroll space.
  • outlet guiding arrangement as described in claim 1 wherein there is additionally provided outlet header means in communication with the scroll via which means the fluid received in the scroll may be discharged, the said scroll having such cross-sectional dimensions increasing in the direction of the flow that the pressure fluid entering the scroll successively from the curvilinear diffusers is maintained at substantially uniform velocity, and is thus guided into the outlet header means.
  • said surface being appropriately formed to define a portion of said diffusers, and of an oppositely formed surface of a second separate casing part, said two surfaces being brought together in a plane normal to the axis of the pump or blower to register the corresponding formation of both said surfaces.
  • An outlet guiding arrangement as described in claim 10 wherein one of said casing parts additionally forms by its side opposite said surface, a portion of the wall of the scroll space, said wall portion being discontinued in the areas of the diffuser outlets thereby to provide for direct communication between said diffuser outlets and the scroll space.
  • the said guide-duct diffusers are constituted of a surface of a first outer casing part, said surface being appropriately formed to define a portion of said diffusers and of an oppositely formed surface of a separate middle casing part, said two surfaces being brought together in a plane normal to the axis of the pump or blower to register the corresponding formations of both said surfaces, the other side of said middle casing part having a surface forming the wall defining the side of the scroll space adjacent the diffusers, said middle casing part being discontinued in the areas of the diffuser outlets thereby to provide for direct communication between said diffuser outlets and the scroll space, and of a third convoluted casing portion, the last said portion being formed with a surface to provide the remaining wall defining the scroll space and the said side of the middle casing part forming the wall being joined in a second plane normal to the rotor axis with the thus formed wall of the third casing part to register their corresponding surfaces.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US251742A 1946-03-06 1951-10-17 Outlet guiding arrangement Expired - Lifetime US2596647A (en)

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Application Number Priority Date Filing Date Title
CH2596647X 1946-03-06

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US (1) US2596647A (enrdf_load_stackoverflow)
FR (1) FR942669A (enrdf_load_stackoverflow)
NL (1) NL76847C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748713A (en) * 1952-03-21 1956-06-05 Buchi Alfred Multi-stage centrifugal pump or blower
US2956736A (en) * 1959-05-14 1960-10-18 Jr Mayer Mayer Centrifugal fans

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171353A (en) * 1962-02-27 1965-03-02 Kenton D Mcmahan Centrifugal fluid pump
US3188968A (en) * 1963-02-12 1965-06-15 Kenton D Mcmahan Centrifugal pumps
US3243102A (en) * 1963-12-20 1966-03-29 Kenton D Mcmahan Centrifugal fluid pump

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB170815A (en) * 1920-07-14 1921-10-14 Owen Alfred Price Improvements in centrifugal or turbine pumps
DE400465C (de) * 1921-02-15 1924-08-19 Karl Wernert Schraubenfoermige Leitschaufel fuer Kreiselpumpen und Verdichter
FR600975A (fr) * 1925-04-24 1926-02-19 Pompe centrifuge
US2268358A (en) * 1939-03-13 1941-12-30 Edward T Turner Centrifugal pump
US2311024A (en) * 1941-03-08 1943-02-16 Buchi Alfred Guide apparatus for centrifugal blowers and pumps
US2405048A (en) * 1944-11-18 1946-07-30 Gen Electric Centrifugal compressor
US2419669A (en) * 1942-05-08 1947-04-29 Fed Reserve Bank Diffuser for centrifugal compressors

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB170815A (en) * 1920-07-14 1921-10-14 Owen Alfred Price Improvements in centrifugal or turbine pumps
DE400465C (de) * 1921-02-15 1924-08-19 Karl Wernert Schraubenfoermige Leitschaufel fuer Kreiselpumpen und Verdichter
FR600975A (fr) * 1925-04-24 1926-02-19 Pompe centrifuge
US2268358A (en) * 1939-03-13 1941-12-30 Edward T Turner Centrifugal pump
US2311024A (en) * 1941-03-08 1943-02-16 Buchi Alfred Guide apparatus for centrifugal blowers and pumps
US2419669A (en) * 1942-05-08 1947-04-29 Fed Reserve Bank Diffuser for centrifugal compressors
US2405048A (en) * 1944-11-18 1946-07-30 Gen Electric Centrifugal compressor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748713A (en) * 1952-03-21 1956-06-05 Buchi Alfred Multi-stage centrifugal pump or blower
US2956736A (en) * 1959-05-14 1960-10-18 Jr Mayer Mayer Centrifugal fans

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Publication number Publication date
NL76847C (enrdf_load_stackoverflow)
FR942669A (fr) 1949-02-15

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