EP0222233B1 - Mehrstufige Kreiselpumpe zur Förderung von Flüssiggas - Google Patents

Mehrstufige Kreiselpumpe zur Förderung von Flüssiggas Download PDF

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Publication number
EP0222233B1
EP0222233B1 EP86114824A EP86114824A EP0222233B1 EP 0222233 B1 EP0222233 B1 EP 0222233B1 EP 86114824 A EP86114824 A EP 86114824A EP 86114824 A EP86114824 A EP 86114824A EP 0222233 B1 EP0222233 B1 EP 0222233B1
Authority
EP
European Patent Office
Prior art keywords
space
pump
stage
centrifugal pump
relief
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
Application number
EP86114824A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0222233A3 (en
EP0222233A2 (de
Inventor
Jürgen Schill
Hans-Joachim Dr. Franke
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.)
KSB AG
Original Assignee
KSB AG
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 KSB AG filed Critical KSB AG
Priority to AT86114824T priority Critical patent/ATE59694T1/de
Publication of EP0222233A2 publication Critical patent/EP0222233A2/de
Publication of EP0222233A3 publication Critical patent/EP0222233A3/de
Application granted granted Critical
Publication of EP0222233B1 publication Critical patent/EP0222233B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/083—Units comprising pumps and their driving means the pump being electrically driven for submerged use and protected by a gas-bell
    • 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
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings

Definitions

  • the invention relates to a multi-stage centrifugal pump for conveying liquid gas, which is arranged in a container receiving liquid gas so that at least the first pump stage is constantly below the liquid level, and which is provided with a mechanical seal located behind the last pump stage and loaded with a sealing liquid , with the mechanical seal upstream of chokes and spaces in which the medium is converted into a gaseous state.
  • centrifugal pump When pumping liquefied gas, due to the conditions given by the system in the worst case, it can be assumed that the pumped medium at the inlet to the centrifugal pump is only under saturation pressure. Since a centrifugal pump can only work satisfactorily if the pressure in front of the impeller of its first stage is a certain amount above the saturation pressure of the medium, a special measure must be taken here:
  • the centrifugal pump is arranged in a container so that at least its first level is constantly below the liquid level. The pressure of the liquid column located above the impeller, which is used in this way, ensures that no harmful cavitation occurs in the impeller.
  • the vertically arranged pot pump was particularly suitable for use under the conditions mentioned. However, this still had a serious problem: Since the drive shaft of the centrifugal pump was also located within the pump riser, the shaft seal to the atmosphere had to be designed for the final pressure of the pump. Mechanical seals were generally used for this. If the pressure to be sealed was now very high or there was a requirement that contamination of the delivery medium by the barrier medium of the mechanical seal be avoided, it had to be ensured that the gas phase of the delivery medium was present on the mechanical seal. This was achieved by throttling sections with subsequent larger rooms in which the liquid was converted into gas. For this purpose, however, a connection had to be made to a room of low pressure, in which the gas quantities were then continuously removed.
  • the invention has for its object to ensure the presence of the gas phase on the mechanical seal with little effort in a centrifugal pump of the known type mentioned.
  • the excess gas can be discharged without problems, for example to the inlet connection of the container receiving the centrifugal pump, to the upper part of the container or pot, to a storage tank or via permanent degassing.
  • the blocking effect of the throttle section upstream of the collecting chamber, which is directed against the access of liquid medium, can be increased by means of conveying devices acting in the direction of the relief chamber, such as conveying thread or centripetal impeller.
  • the wall of the collecting room can be provided with ribs for the supply of external heat. It is also possible to arrange heating elements in and on the collecting room.
  • the centrifugal pump according to the invention can be arranged in a pot or, for example, several, standing or lying in a larger container.
  • a centrifugal pump (4) is arranged in a pot (1) which is provided with an inlet connection (2) and a pressure connection (3).
  • the centrifugal pump (4) has four pump stages.
  • the first pump stage (5) is located near the bottom of the pot (1). This is to ensure that it is always below the liquid level of the pumped medium reaching the pot (1) via the inlet connection (2).
  • the first pump stage (5) is connected to the second pump stage (7) via a riser (6).
  • the other pump stages immediately follow the second.
  • a known type of relief device equipped with a relief piston (8) serves to relieve the axial thrust of the centrifugal pump (4).
  • the relief piston (8) forms a gap (9) with the housing of the centrifugal pump (4) surrounding it.
  • a relief chamber (10) is provided above the relief piston (8) and communicates with the second pump stage (7) via bores and a pipe (11). This connection ensures that liquid discharge medium is always present in the relief chamber (10) and that no steam is produced which would jeopardize the proper functioning of the relief device.
  • a collection space (12) is located above the relief space (10); In the connection between these two spaces, a feed thread (13) acting in the direction of the relief space (10) is provided.
  • the pressure generated by the delivery thread (13) when immersed in liquid has the result that liquid delivery medium is kept away from the collecting space 12.
  • the delivery thread (13) acts self-regulating due to the gas content of the collecting space (12); the leakage through the gap left by the conveying thread (13) is close to zero: a certain liquid level is established in the gap of the conveying thread (13) according to the counter pressure in the relief chamber (10).
  • the only slight leak in the collecting space (12) is gas that arises from boiling on the surface of the liquid in the gap. Excess gas is removed by a line (14) which is either designed as permanent degassing or which can lead to the inlet connection (2), to the upper part of the pot (1) or to a storage tank.
  • the leakage of sealing liquid occurring in the expansion chamber (15) is discharged via an outlet (17).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP86114824A 1985-11-06 1986-10-24 Mehrstufige Kreiselpumpe zur Förderung von Flüssiggas Expired - Lifetime EP0222233B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86114824T ATE59694T1 (de) 1985-11-06 1986-10-24 Mehrstufige kreiselpumpe zur foerderung von fluessiggas.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3539251 1985-11-06
DE19853539251 DE3539251A1 (de) 1985-11-06 1985-11-06 Mehrstufige kreiselpumpe zur foerderung von fluessiggas

Publications (3)

Publication Number Publication Date
EP0222233A2 EP0222233A2 (de) 1987-05-20
EP0222233A3 EP0222233A3 (en) 1988-08-24
EP0222233B1 true EP0222233B1 (de) 1991-01-02

Family

ID=6285228

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114824A Expired - Lifetime EP0222233B1 (de) 1985-11-06 1986-10-24 Mehrstufige Kreiselpumpe zur Förderung von Flüssiggas

Country Status (4)

Country Link
US (1) US4753571A (enrdf_load_stackoverflow)
EP (1) EP0222233B1 (enrdf_load_stackoverflow)
AT (1) ATE59694T1 (enrdf_load_stackoverflow)
DE (1) DE3539251A1 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4033473A1 (de) * 1990-10-20 1992-04-23 Pacific Wietz Gmbh & Co Kg Verfahren und anordnung zum messen der leckrate einer gleitringdichtung
DE69517071T2 (de) * 1994-02-23 2001-02-01 Ebara Corp., Tokio/Tokyo Pumpeneinheit mit Entspannungsturbine
DE19501900A1 (de) * 1995-01-23 1996-07-25 Klein Schanzlin & Becker Ag Gleitringdichtung für Kesselspeisepumpen
EP3199859B1 (en) * 2016-01-29 2021-05-26 Cryostar SAS Submersible pump assembly for dispensing liquefied gas
CN109185175A (zh) * 2018-10-12 2019-01-11 东莞宏剑工业设备有限公司 直流无刷磁力泵

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA607566A (en) * 1960-10-25 Borg-Warner Corporation Mechanical seal for liquid oxygen pump
US2281650A (en) * 1940-01-27 1942-05-05 Worthington Pump & Mach Corp Circulating pump for steam generators
GB637005A (en) * 1948-03-19 1950-05-10 Jonkopings Mek Werkstads Atkie Improvements in centrifugal pumps
US3117792A (en) * 1963-06-10 1964-01-14 United Aircraft Corp Fusible shaft seal
DE1930674U (de) * 1963-08-02 1966-01-05 Klein Schanzlin & Becker Ag Bruehrungsfreie wellenabdichtung fuer hochtourige kreiselpumpen, insbesondere hochdruckkesselspeisepumpen.
US3370542A (en) * 1965-10-21 1968-02-27 Dresser Ind Temperature detection device
US3733145A (en) * 1971-03-04 1973-05-15 Nevsky Mash Vand-type centrifugal machine, mainly, high-pressure compressor
GB1366895A (en) * 1971-08-26 1974-09-18 Weir Pumps Ltd Rotary shaft liquid handling machines
DE2600505C3 (de) * 1976-01-08 1981-03-12 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Hydrostatische Wellenabdichtung
US4128362A (en) * 1977-04-22 1978-12-05 Dresser Industries, Inc. Flushing and cooling system for pumps
NZ197872A (en) * 1980-08-05 1985-03-20 Sihi Gmbh & Co Kg Self priming multi-stage centrifugal pump for liquids near boiling point
EP0150515A1 (en) * 1984-01-13 1985-08-07 B.V. Neratoom Pump for circulating a cooling fluid consisting of a liquid metal in a cooling circuit of a nuclear reactor

Also Published As

Publication number Publication date
ATE59694T1 (de) 1991-01-15
EP0222233A3 (en) 1988-08-24
DE3539251C2 (enrdf_load_stackoverflow) 1987-12-03
EP0222233A2 (de) 1987-05-20
DE3539251A1 (de) 1987-05-14
US4753571A (en) 1988-06-28

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