EP0045483B1 - Selbstansaugende Kreiselpumpe, insbesondere zur Förderung von Flüssigkeiten in der Nähe ihres Siedepunktes - Google Patents

Selbstansaugende Kreiselpumpe, insbesondere zur Förderung von Flüssigkeiten in der Nähe ihres Siedepunktes Download PDF

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Publication number
EP0045483B1
EP0045483B1 EP81105972A EP81105972A EP0045483B1 EP 0045483 B1 EP0045483 B1 EP 0045483B1 EP 81105972 A EP81105972 A EP 81105972A EP 81105972 A EP81105972 A EP 81105972A EP 0045483 B1 EP0045483 B1 EP 0045483B1
Authority
EP
European Patent Office
Prior art keywords
centrifugal pump
stage
supply chamber
fluid supply
pump
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
Application number
EP81105972A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0045483A3 (en
EP0045483A2 (de
Inventor
Wilfried Dr. Ing. Lehmann
Peter Ing.-Grad Fandrey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sihi GmbH and Co KG
Original Assignee
Sihi GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sihi GmbH and Co KG filed Critical Sihi GmbH and Co KG
Priority to AT81105972T priority Critical patent/ATE5433T1/de
Publication of EP0045483A2 publication Critical patent/EP0045483A2/de
Publication of EP0045483A3 publication Critical patent/EP0045483A3/de
Application granted granted Critical
Publication of EP0045483B1 publication Critical patent/EP0045483B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
    • F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative 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
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • F04D5/003—Regenerative pumps of multistage type
    • F04D5/006—Regenerative pumps of multistage type the stages being axially offset

Definitions

  • the invention relates to a centrifugal pump with a first normal-suction centrifugal pump stage arranged on the suction side, a pump suction nozzle lying axially at shaft height and at least one downstream self-priming centrifugal pump stage working with auxiliary liquid.
  • Pumps of this type are known (DEB-1528826), in particular for conveying media close to their boiling point, e.g. Liquefied gases, where any flow loss on the pump suction side must be avoided to prevent cavitation in the first pump stage.
  • the suction port lying axially at the level of the shaft is intended to avoid sharp diversions of the inflowing medium inside the pump before the first stage.
  • the suction line should also be routed to the container or tank to be pumped empty without major changes in direction, in order to keep the flow losses in the supply as low as possible.
  • a liquid storage space of sufficient size for the priming process is arranged between two pump stages, which is connected in its geodetically upper part to the preceding centrifugal pump stage and in its geodetically lower part to a subsequent centrifugal pump stage, a seal for sealing the shaft gap is arranged between the liquid storage space and the preceding centrifugal pump stage.
  • the liquid storage space between the normal priming first stage and the first following self-priming centrifugal pump stage, which means that the largest possible proportion of liquid when the pump drops, i.e. when the liquid flows back from the pressure line through the pump into the suction-side container, it is retained in the pump itself, since a, albeit small, portion of liquid also remains in the self-priming gyro stages following the storage space.
  • this liquid is then conveyed within a short time to the last self-priming stage, which is known to take over the priming alone and is then available to this stage as operating fluid for the priming process.
  • the liquid storage space arranged between two pump stages can now also be used according to the invention for the further purposes of liquid gas separation during the conveying process, in which case it is expediently arranged between the first and the second self-priming centrifugal stage and a connection for a in the region of the geodetically highest point of this liquid storage space Tapping line.
  • the Arranging the liquid storage space at this point has the advantage that a large part of the liquid portion that may be outgassed on the suction side of the pump and in the suction line is already condensed again due to compression by the fully loaded stage and the first self-priming stage and only a remainder at this point gasified medium is contained in the flow.
  • This residual portion of gaseous medium can then be returned to the suction-side tank or container via the extraction line provided in the highest point of the liquid storage space, so that only gas-free liquid is conveyed from the stages following the liquid storage space and leaves the pump pressure connection.
  • a correspondingly optimally dimensioned cross-section of the line leading back from the liquid storage space to the container or tank also allows a possible proportion of liquid flowing back with the gas to be reduced to a minimum, so that the pump efficiency is influenced only to an insignificant extent or not at all.
  • this space In order to increase the separation effect in the liquid storage space, it is proposed to design this space as a liquid gas separation and separation container by appropriate design and the installation of ribs. These internals also have the additional advantage that they also fall off when the pump drops, i.e. when the liquid flows back after switching off from the pressure line through the pump back into the suction-side container, brake the backflow of the medium and thereby retain a particularly large part of the liquid in the pump part which is connected downstream of the liquid storage space.
  • the axial extent of the liquid storage space should correspond approximately to the axial extent of a side channel step, since this retains sufficient liquid in the pump for the suction process.
  • the suction slot of the side channel pump stage following the liquid storage space be arranged in the geodetically lower area of the liquid storage space, so that the entire liquid supply of the storage space, even when the pump is restarted, serves the self-priming stages as an auxiliary or operating liquid for the suction process is available.
  • the liquid storage space is expediently connected to a device for automatically checking the liquid level in the liquid storage space, which emits a signal or prevents the pump from being started up if the liquid storage space does not contain a sufficient amount of liquid. Furthermore, it can be expedient if a time relay is provided, which switches the pump off again after switching on if the suction has not taken place within a certain predetermined time period. These measures result in securing the pump against running dry.
  • the pump shaft is designated 1 and once carries the fully loaded normal suction impeller 2 in the first pump stage, which is specially designed for optimal pumping speed, i.e. is designed for the lowest possible NPSH value of the pump, without placing particular value on the efficiency and delivery head of this first wheel.
  • the impellers of the following side channel stages are designated.
  • 4 is the pump suction housing with the suction port 5 and the inlet 6 arranged axially at shaft height.
  • the pump housing of the standard suction stage is designated 7, the housing parts of the following side channel pump stages are 8 and 9.
  • the pressure port 11 is located on the pump pressure housing 10 the pressure housing 10 still follows the mechanical seal or seal housing 12.
  • the liquid storage space 13 behind the first fully loaded centrifugal pump stage, the liquid storage space 13 is provided, the transition to the first fully loaded centrifugal pump stage is arranged in the geodetically upper region of the liquid storage space, above the partition wall 14, which separates the liquid storage space from the first fully loaded centrifugal pump stage. Furthermore, shaft seal 16 is provided between the housing part 15 forming the first storage space in the area of the shaft between this housing part and shaft 1, which prevents liquid in the area of the hub from passing from the liquid storage space or the downstream pump stages into the first pump stage.
  • the liquid storage space 13 is arranged behind the first self-priming and before the second self-priming side-channel centrifugal pump stage, the connection from the liquid storage space to the previous one Centrifugal pump stage takes place again in the geodetically upper area of the liquid storage space and above the partition 14, while a shaft seal 16 is again arranged between the shaft and the hub part of the housing 15.
  • 13 ribs 17 are provided in the liquid storage space, which are intended to bring about a separation between gas and liquid in the storage space, a removal opening 18 being additionally arranged at the geodetically highest point of the storage space; to return the gas components in the room 13 into the suction-side container or tank from which the pump sucks.
  • the self-priming pump stages are designed as side channel centrifugal pumps and the suction slot 19 of the side channel stage following the liquid storage space can be seen in the geodetically lowest point of the liquid storage space.
  • the pump shaft is supported in a slide bearing 20 and a ball bearing 21.
  • Fig. 3 can be seen on the base plate 22, the pump with the intake port 6, the housing part 7 of the first pump stage, the housing part 15 of the liquid reservoir and the housing parts 8 and 9 of the following self-priming stage.
  • the pump is driven by an electric motor 23.
  • a device 26 for determining the liquid level in the liquid storage space the electrical energy of which is supplied by a battery 27, is connected via connections 24, 25 to the upper or lower part of the housing part 15 of the liquid storage space.
  • Such devices for determining the liquid level are known and therefore do not require any explanation here.
  • the device is set in such a way that it emits a signal if, when the pump is switched on, the liquid level in the liquid storage room is below a certain limit which must be reached if the liquid in the liquid storage room is to be sufficient for the suction process.
  • the pump motor 23 is either prevented from running automatically and / or the operator is made aware of the insufficient fluid level in the pump so that it can provide a refill.
  • the device 26 is set up in such a way that when a certain time period has elapsed - for example 30 seconds - after the pump has started up, it is checked whether the pump has sucked in. If the suction has not taken place, the pump is switched off automatically.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Toys (AREA)
EP81105972A 1980-08-05 1981-07-29 Selbstansaugende Kreiselpumpe, insbesondere zur Förderung von Flüssigkeiten in der Nähe ihres Siedepunktes Expired EP0045483B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81105972T ATE5433T1 (de) 1980-08-05 1981-07-29 Selbstansaugende kreiselpumpe, insbesondere zur foerderung von fluessigkeiten in der naehe ihres siedepunktes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3029604 1980-08-05
DE3029604 1980-08-05

Publications (3)

Publication Number Publication Date
EP0045483A2 EP0045483A2 (de) 1982-02-10
EP0045483A3 EP0045483A3 (en) 1982-02-17
EP0045483B1 true EP0045483B1 (de) 1983-11-23

Family

ID=6108913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81105972A Expired EP0045483B1 (de) 1980-08-05 1981-07-29 Selbstansaugende Kreiselpumpe, insbesondere zur Förderung von Flüssigkeiten in der Nähe ihres Siedepunktes

Country Status (9)

Country Link
US (1) US4390317A (es)
EP (1) EP0045483B1 (es)
AT (1) ATE5433T1 (es)
AU (1) AU542218B2 (es)
CA (1) CA1165624A (es)
DK (1) DK149932C (es)
ES (1) ES8206774A1 (es)
HK (1) HK39685A (es)
NZ (1) NZ197872A (es)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2553835B1 (fr) * 1983-10-25 1986-02-28 Bertin & Cie Machine de compression d'un fluide, a plusieurs etages de compression en serie
DE3425656C2 (de) * 1984-07-12 1994-12-08 Sero Pumpenfabrik Gmbh Kreiselpumpe
DE3539251A1 (de) * 1985-11-06 1987-05-14 Klein Schanzlin & Becker Ag Mehrstufige kreiselpumpe zur foerderung von fluessiggas
DE3717058A1 (de) * 1987-05-21 1988-12-08 Bayer Ag Mischer zum vermischen mindestens zweier fliessfaehiger stoffe, insbesondere unter durchfuehrung bzw. einleitung einer reaktion waehrend der vermischung
DE4113029A1 (de) * 1991-04-20 1992-10-22 Sihi Gmbh & Co Kg Selbstansaugende kreiselpumpe zur foerderung von fluessigkeiten in der naehe ihres siedepunktes
DE4241406C2 (de) * 1992-12-09 2001-10-18 Bosch Gmbh Robert Gebläsegehäuse
JPH0886298A (ja) * 1994-09-19 1996-04-02 Hitachi Ltd ドライターボ真空ポンプ
DE29513904U1 (de) * 1995-08-30 1997-01-09 Sihi GmbH & Co KG, 25524 Itzehoe Seitenkanalkreiselpumpe mit Stufenpaketen in Blechkonstruktion
IT1398142B1 (it) * 2010-02-17 2013-02-14 Nuovo Pignone Spa Sistema singolo con compressore e pompa integrati e metodo.
WO2014033317A1 (de) * 2012-09-03 2014-03-06 Sterling Industry Consult Gmbh Seitenkanalpumpe und verfahren zum betreiben einer seitenkanalpumpe
EP3686434A1 (en) 2019-01-25 2020-07-29 Pentair Flow Technologies, LLC Self-priming assembly for use in a multi-stage pump

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE711791C (de) * 1938-04-28 1941-10-07 Anna Dickow Geb Driemeyer Anordnung des Antriebes fuer eine nicht selbstansaugende Kreiselpumpe
US2553066A (en) * 1944-06-30 1951-05-15 Southern John Self-priming centrifugal pump
DE1528826A1 (de) * 1951-01-28 1969-11-20 Siemen & Hinsch Gmbh Kreiselpumpe
DE888207C (de) * 1951-08-10 1953-08-31 Siemens Ag Selbstansaugende Pumpe
US3385225A (en) * 1965-06-29 1968-05-28 Siemen & Hinsch Gmbh Rotary pump
DE2534740C3 (de) * 1975-08-04 1983-02-03 Franz 4630 Bochum Klaus Spaltrohrkreiselpumpe

Also Published As

Publication number Publication date
ES504574A0 (es) 1982-08-16
DK149932B (da) 1986-10-27
AU542218B2 (en) 1985-02-14
CA1165624A (en) 1984-04-17
ES8206774A1 (es) 1982-08-16
AU7369181A (en) 1982-02-11
DK149932C (da) 1987-10-12
DK346881A (da) 1982-02-06
US4390317A (en) 1983-06-28
HK39685A (en) 1985-05-31
EP0045483A3 (en) 1982-02-17
ATE5433T1 (de) 1983-12-15
NZ197872A (en) 1985-03-20
EP0045483A2 (de) 1982-02-10

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