US3391642A - Multistage centrifugal pumps - Google Patents

Multistage centrifugal pumps Download PDF

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Publication number
US3391642A
US3391642A US573986A US57398666A US3391642A US 3391642 A US3391642 A US 3391642A US 573986 A US573986 A US 573986A US 57398666 A US57398666 A US 57398666A US 3391642 A US3391642 A US 3391642A
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United States
Prior art keywords
impeller
liquid
pump
turbine runner
shaft
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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US573986A
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English (en)
Inventor
Vymola Vaclav
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Sigma
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Sigma
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Publication date
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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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/04—Units comprising pumps and their driving means the pump being fluid driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling

Definitions

  • this first impeller Fixedly connected with this first impeller is a driving turbine runner, and a means is provided for supplying pressure liquid to the turbine runner as well as for removing liquid therefrom, so that through the turbine runner the first freely rotatable impeller can turn relative to the drive shaft, and the succeeding impellers which are fixed thereto, for controlling the suction.
  • This invention relates to multistage centrifugal pumps and more particularly to centirfugal pumps with control of the suction capacity.
  • multistage centrifugal pumps for pumping liquids where the static pressure on the suction side approaches the saturated vapour tensions are designed so as to prevent cavitation. This can be attained mainly by enlarging the inlet for the iirst stage impeller, or by injection of rather cool liquid into the suction space.
  • an independent priming pump with lower r.p.m. number is arranged in front of the condensateextraction pumps. Said designs are disadvantageous name ly because they make the dimensions of pumping aggregates larger and their use is, in many cases, reduced to relatively small capacities.
  • the invention resides substantially in that the multistage centrifugal pump is provided with a first stage suction impeller freely turning on the pump shaft, said rst stage suction impeller connected to a ⁇ driving turbine runner.
  • the driving turbine runner is driven by the pumped liquid supplied by Way of a diffuser by an additional pump impeller keyed on the pump shaft.
  • the turbine runner is driven by the pressure liquid from some foreign source passing through a distributor and through control means adjusting the pressure, direction and amount of said pressure liquid.
  • the invention resides further in that the first stage impeller pivoted on the pump shaft is designed as a double impeller having one inlet and two outlets..
  • the invention resides finally in ⁇ that the suction space of the additional pump impeller is interconnected by means of circulation piping with some of the pressure spaces of the pump stages.
  • FIG.. l shows an arrangement with a driving turbine runner cooperating with an additional pump impeller and with a control member.
  • FIG. 2 illustrates a similar arrangement wherein the driving turbine runner is driven by the liquid from a foreign source.
  • the multistage centrifugal pump comprises a casing 13 defining a cavity and capable to hold a liquid.
  • the casing 13 is provided with a suction inlet 24 and with a discharge outlet 28.
  • An impeller driving shaft 14 driven from a not shown engine is rotatably mounted in said casing 13 in bearings 18, 19, the hydraulic space sealed by stuiiing boxes 20, 21.
  • a number of axially spaced impellers is supported by the impeller driving shaft 14, the ⁇ first of said impellers 15 closest to the suction inlet 24 and cooperating therewith being freely rotatable on the impeller driving shaft 1'4, the remaining pump impellers 11 keyed on the shaft 14.
  • the first impeller 15 is connected to a driving turbine runner 16 equally freely rotating around the impeller driving shaft 14.
  • the first stage impeller 15 and the driving turbine runner 16 can be for instance connected by bolts or by mounting on its hub or both impeller 1'5 and runner 16 can be made as one unit.
  • On the shaft 14 an additional impeller A17 is further keyed in front of said driving turbine runner 16.
  • a diffuser 22 connects the outlet of the pump impeller 17 with the inlet of the driving turbine runner 16.
  • the driving turbine runner 16, the additional impeller 17 and the diffuser element 22 form thus a substantially closed circuit, circulating a certain amount of liquid. It is advantageous to provide said diffuser 22 with a control member 23 of known design, which adjusts the parameters of the driving liquid entering the turbine runner 16, as pressure, direction and amount of the pressure liquid.
  • the diffuser 22 is connected with the other parts of the pump and forms with them a compact unit.
  • One lor more channels 25 connect the space of the impeller 415 with the space of the driving turbine runner 16.
  • the cavity of the casing 13 should be filled with the pumped liquid.
  • Said liquid fills both the spaces of the proper pump and the spaces of driving turbine runner ⁇ 16, of pump impeller 17 and diffuser 22 as well.
  • the liquid enters said spaces through the channel or channels 25 interconnecting the space of suction inlet 24 or the space of the first stage suction impeller with the driving turbine runner 16.
  • the pump shaft 14 starts to rotate, simultaneously the pump impeller 17 runs at the same number of r.p.m.
  • Said pump impeller 17 supplies pressure liquid through the diffuser 22 into the driving turbine runner 16 and causes it to run at a lower speed.
  • the first stage suction impeller 15 rotates at the same speed, sucking the pumped liquid and conveying it to the other stages.
  • the variable condition of the liquid level in the condenser requires adjustment of the suction capacity of the pump. This can be attained by means of changing the r.p.m. number of the first stage suction irnpeller 15.
  • control element 23 controlling the pressure, ⁇ direction and amount of the driving liquid is mounted in the diffuser 22 in front of the inlet of the driving turbine runner 16. It is advantageous to provide said control element 23 with adjustable blades which in accordance with variations of the condenser level, are appropriately adjusted for the most suitable speed, direction, pressure and amount of the fiowing liquid.
  • the speed of the driving turbine runner i16 is adjusted and, at the same time, the speed of the first stage suction impeller 15 which further alter the suction capacity and the total output of the pump.
  • the control element is arranged in some different manner, its control has to be properly arranged so as to respond to differences of the condenser level.
  • the driving turbine runner 16 is made to rotate by means of pressure liquid from some foreign source or from the outlet of the pump or from some of its stages.
  • the additional pump impeller 17 is not necessary and the diffuser acts as a distributor 27.
  • the liquid is discharged from the turbine runner by way of the discharge outlet 31. If a closed circuit is used, the pressure liquid should pass an appropriate cooling device.
  • this invention represents a step forward in the construction of condensateextraction pumps for greater capacity than at present.
  • Another advantage is that the pump can be designed as a single piece assembly having relatively low weight and dimensions because it is possible to use high velocities of the delivery stages and a controlled low velocity of the suction stage. Owing to the above mentioned facts, a high andadjustable suction capacity is provided with the possibility of appropriate accommodation of the pump to the operating conditions as well.
  • the arrangement of the pump is relatively simple with low requirements upon production.
  • Multistage centrifugal pump comprising a casing defining a cavity and capable to hold a liquid, a suction inlet and discharge outlet provided in said casing, an impeller driving shaft rotatable mounted in said casing,
  • each impeller having an inner central inlet and an outer peripheral outlet
  • said casing provided with coaxially stacked peripherally abutting interstage diaphragms between said impellers, said interstage diaphragms supporting diffuser elements passing liquid from one impeller stage to the subsequent one
  • a driving turbine ruimer coaxial with said impellers and rfixedly connected to said first impeller which is freely rotatable on said impeller driving shaft
  • said driving turbine runner having an outer peripheral inlet and a central inner outlet so that liquid fiows therethrough radially in a direction opposite to the direction of liquid fiow through said impellers, means for supplying pressure liquid to said outer peripheral inlet of said turbine runner and means for removal of said liquid from said inner central outlet thereof,
  • Multistage centrifugal pump comprising a casing defining a cavity and capable to hold a liquid, a suction inlet and a discharge outlet provided in said casing, an impeller driving shaft rotatably mounted in said casing, a number of axially spaced impellers acting in series supported by said shaft, increasing progressively the pressure of the pumped liquid, the first of said impellers closest to the suction inlet freely rotatable on said shaft, the remaining impellers fixed on said shaft, said casing provided with coaxially stacked peripherally abutting interstage diaphragrns between said impellers, said interstage diaphragms supporting diffuser elements passing liquid from one impeller stage to the subsequent one, a driving turbine runner coaxial with sai-d impellers connected to said first impeller freely rotatable on said impeller driving shaft, means for supply pressure liquid to said turbine runner, means for removal of said liquid therefrom, and means for sealing the impeller driving shaft mounted in said casing, the first stage impeller
  • Multistage centrifugal pump as in claim y1, said driving turbine runner supplied with pressure liquid from an external source.
  • Multistage centrifugal pump as in claim 1, an additional impeller fixed to said shaft, said driving turbine runner supplied with pressure liquid from said additional impeller.
  • Multistage centrifugal pump as in claim 1 with means for adjustment of the parameters of the pressure liquid supplied to said driving turbine runner.
  • Multistage centrifugal pump comprising a casing defining a cavity and capable to hold a liquid, a suction inlet ⁇ and a discharge outlet provided in said casing, an impeller driving shaft rotatably mounted in said casing, a number of axially spaced impellers acting in series supported by said shaft, increasing progressively the pressure of the pumped liquid, the first of said impellers closest to the suction inlet freely rotatable on said shaft, the remaining impellers fixed on said shaft, said casing provided with coaxially stacked peripherally abutting interstage diaphragms between said impellers, said interstage diaphragms supporting diffuser elements passing liquid from one impeller stage to the subsequent/one, a driving turbine runner coaxial with said impellers connected to said first impeller freely rotatable on said impeller driving shaft, means for supplying pressure liquid to said turbine runner, means for removal of said liquid therefrom, means for sealing the impeller driving shaft mounted in said casing, and an additional pump impeller inside said
  • Multistage centrifugal pump as in claim 6 provided with diffuser elements passing pressure liquid from said additional pump impeller to said driving turbine runner.
  • Multistage centrifugal pump as in claim 6 provided with means for adjustment of the parameters of the pressure liquid supplied by said additional pump impeller to said driving turbine runner, forming thus a substantially closed circuit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US573986A 1965-08-23 1966-08-22 Multistage centrifugal pumps Expired - Lifetime US3391642A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS521065 1965-08-23

Publications (1)

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US3391642A true US3391642A (en) 1968-07-09

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US573986A Expired - Lifetime US3391642A (en) 1965-08-23 1966-08-22 Multistage centrifugal pumps

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US (1) US3391642A (enrdf_load_stackoverflow)
BE (1) BE685727A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433117A1 (fr) * 1978-08-07 1980-03-07 Guinard Pompes Turbopompe
US5738305A (en) * 1995-02-22 1998-04-14 The B.F. Goodrich Company Inflation system
US20080264061A1 (en) * 2007-04-30 2008-10-30 Thomas Edward Wickert Method and apparatus to facilitate fluid compression
IT201800005047A1 (it) * 2018-05-03 2019-11-03 Apparato per sostituire un fluido di trasmissione esausto circolante in un circuito di raffreddamento di un autoveicolo con un fluido di trasmissione nuovo
US10697462B2 (en) 2016-09-26 2020-06-30 Fluid Handling Llc Multi-stage impeller produced via additive manufacturing

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US921118A (en) * 1905-05-26 1909-05-11 Westinghouse Machine Co Pump.
US1089248A (en) * 1912-09-18 1914-03-03 Anthony George Maldon Michell Centrifugal pump.
US2349731A (en) * 1942-03-20 1944-05-23 Ingersoll Rand Co Centrifugal pump
NL59665C (enrdf_load_stackoverflow) * 1942-08-06 1947-06-17

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US921118A (en) * 1905-05-26 1909-05-11 Westinghouse Machine Co Pump.
US1089248A (en) * 1912-09-18 1914-03-03 Anthony George Maldon Michell Centrifugal pump.
US2349731A (en) * 1942-03-20 1944-05-23 Ingersoll Rand Co Centrifugal pump
NL59665C (enrdf_load_stackoverflow) * 1942-08-06 1947-06-17

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433117A1 (fr) * 1978-08-07 1980-03-07 Guinard Pompes Turbopompe
US5738305A (en) * 1995-02-22 1998-04-14 The B.F. Goodrich Company Inflation system
US20080264061A1 (en) * 2007-04-30 2008-10-30 Thomas Edward Wickert Method and apparatus to facilitate fluid compression
US8047809B2 (en) * 2007-04-30 2011-11-01 General Electric Company Modular air compression apparatus with separate platform arrangement
US10697462B2 (en) 2016-09-26 2020-06-30 Fluid Handling Llc Multi-stage impeller produced via additive manufacturing
IT201800005047A1 (it) * 2018-05-03 2019-11-03 Apparato per sostituire un fluido di trasmissione esausto circolante in un circuito di raffreddamento di un autoveicolo con un fluido di trasmissione nuovo

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Publication number Publication date
BE685727A (enrdf_load_stackoverflow) 1967-02-01

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