EP0702155A2 - Pompe pour fluides chauds et corrosifs - Google Patents

Pompe pour fluides chauds et corrosifs Download PDF

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Publication number
EP0702155A2
EP0702155A2 EP95113673A EP95113673A EP0702155A2 EP 0702155 A2 EP0702155 A2 EP 0702155A2 EP 95113673 A EP95113673 A EP 95113673A EP 95113673 A EP95113673 A EP 95113673A EP 0702155 A2 EP0702155 A2 EP 0702155A2
Authority
EP
European Patent Office
Prior art keywords
pump
drive part
pump body
hot
stator ring
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.)
Granted
Application number
EP95113673A
Other languages
German (de)
English (en)
Other versions
EP0702155B1 (fr
EP0702155A3 (fr
Inventor
Hans-Ulrich Dr. Dummersdorf
Helmut Dr. Waldmann
Helmut Dr. Härle
Franz-Rudolf Dr. Minz
Fritz Dr. Gestermann
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.)
Bayer AG
Original Assignee
Bayer 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 Bayer AG filed Critical Bayer AG
Publication of EP0702155A2 publication Critical patent/EP0702155A2/fr
Publication of EP0702155A3 publication Critical patent/EP0702155A3/fr
Application granted granted Critical
Publication of EP0702155B1 publication Critical patent/EP0702155B1/fr
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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0069—Magnetic couplings

Definitions

  • the invention relates to a pump for conveying corrosive media of high temperature and a method for operating this pump.
  • Pumps for conveying dangerous media are known.
  • magnetically coupled pumps are used to avoid tightness problems on otherwise inevitable drive shaft bushings.
  • the pumped medium itself is used to lubricate the bearing, which is usually located near the internal magnets, and thus fills the entire pump interior.
  • Various materials can be used for the entire pump interior for corrosive media.
  • the disadvantage of these pumps is that highly corrosive media cannot be pumped.
  • a pump unit for conveying hot media which has a cooling flow guide such that the cooling air flow of the electric motor driving the pump in the direction of the Bearing bracket and magnetic coupling is steered.
  • the operating temperature of the magnets and the bearings is reduced in a design-simplifying manner, even when hot media are conveyed, and the pump remains operational.
  • such a pump is not suitable for conveying hot and highly corrosive media, such as salt melts, since there are a large number of parts in the interior that come into contact with media and which would be corroded by the salt melt in a very short time.
  • DE-A 4 212 982 proposes a magnetically coupled pump for conveying hot fluids.
  • This invention also aims to cool bearings and magnets when conveying hot fluids so that the bearing and magnet temperatures are limited.
  • This object is achieved in that a coolant inflow channel is provided in the drive shaft for the outer magnet carrier, which is connected to a coolant gap, which in turn is connected to the outer magnet carrier and the inside of an existing outer capsule of the pump, the coolant from the Outer capsule is discharged again.
  • media can be pumped between 200 to 300 ° C, the storage temperatures max. 50 to 60 ° C should be.
  • the proposed pump cannot meet the requirement to ensure a secure seal against a highly corrosive medium to be conveyed directly in its bearing closest to the pump housing, which cannot be achieved with known sealing materials necessary in the construction presented.
  • the intended cooling of the inner bearings would lead to the crystallization of the salt melt in the bearing, which would have its destruction not only by corrosion but also by erosion.
  • a passage of molten salt from the pump housing through the internal bearings into the interior of the pump cannot be prevented with the proposed solution, since no suitable sealing materials are available. Such a process, however, destroys the pump within a very short time.
  • a pump with a drive part and a pump body in which the drive shaft is sealed off from the medium to be conveyed via a shaft seal, that the shaft seal consists of a stator ring fitted into the pump body and / or into the drive part, through which the drive shaft is passed, leaving a sealing gap free, that the pump body and the stator ring including all parts in contact with the media in the pump body are made of a corrosion and high temperature resistant material, that one or more dry-running bearings for mounting the drive shaft are arranged in the drive part and that the drive part has a gas flow channel with a feed and a discharge pipe, which is fluidically connected to the sealing gap.
  • a preferred embodiment is that the rotary movement in the drive part is transmitted to the lift shaft by a magnetic coupling.
  • the dry-running bearing in the drive part advantageously consists of a ceramic roller bearing.
  • the running surfaces of the dry-running bearing can be coated with an inorganic film, e.g. with carbon.
  • a further conventional shaft seal for example a mechanical seal, is arranged between the stator ring and the drive part.
  • the object is further achieved by a method for operating the pump, in which, according to the invention, the gas flow channel is acted upon via the supply nozzle with a hot gas which leaves the drive part again through the discharge nozzle, the admission pressure being set such that the static pressure of the gas in the gas flow channel above the stator ring lies above the pressure of the delivery medium which partially or completely fills the pump body.
  • the temperature of the hot gas is set to a value above 120 ° C. and the static pressure of the hot gas in the flow channel is set to a value above 1.5 bar.
  • Hot steam is advantageously used as the hot gas.
  • the hot gas pressure is expediently regulated by a control loop to a desired value which lies above the delivery pressure of the medium conveyed by the pump.
  • the invention is described in more detail below with reference to an exemplary embodiment shown in the drawing.
  • the figure shows the basic structure of a high temperature and corrosion resistant pump based on a magnetically coupled gear pump.
  • the pump is divided into pump body 1 and drive part 2, the pump body 1 and the drive part 2 being separated by a ceramic stator ring 3 fitted into the pump body 1, through which the drive shaft 4 (pump shaft) is guided.
  • the opening in the stator ring 3 for the passage of the pump shaft 4 has a slightly larger diameter than the pump shaft, so that a sealing gap 5 remains between the pump shaft 4 and the inner surface at the opening of the stator ring.
  • the pump body 1, including all parts in contact with the medium, is made of a high-temperature and corrosion-resistant material, such as ceramic, stoneware etc.
  • the actual pump consists of a gear pump 6, which is arranged in the pump body 1 and is also made of a ceramic material, including the pump shaft.
  • the hot corrosive medium to be pumped flows vertically through the intake port 7 of the gear pump 6 in the direction of the gear wheels, is compressed between the teeth and leaves the pump through a corresponding pressure port on the opposite side of the gear pump 6.
  • the pump shaft or drive shaft 4 is in the drive part 2 firmly connected to a cylindrical cage anchor 9, which can rotate freely in a correspondingly large housing opening 10 in the drive part 2.
  • the cage anchor 9 is mounted by means of ceramic roller bearings 11 which are arranged between the cage anchor 9 and a cylindrical bearing shell 12 which is fixedly connected to the pump part 1 and extends in the axial direction.
  • a pot-shaped rotor 13 is arranged concentrically around the cage anchor 9 in the drive part 2 and is connected to an electric motor via a drive shaft 14.
  • a magnetic pole ring 15 is arranged on the inside of the rotor 13, which together with a counter magnetic pole ring 16 forms a magnetic coupling on the cage armature 9, which serves to transmit the rotary movement from the motor shaft 14 to the drive / pump shaft 4.
  • the motor shaft 14 could also be directly connected to the drive shaft 4.
  • a further conventional seal e.g. a mechanical seal 17 can be provided.
  • the drive part 2 and in particular the cage anchor 9 is provided with a gas flow channel 18.
  • the gas flow channel 18 is supplied with hot gas or superheated steam via a feed connection 19.
  • the hot gas first flows through a radial, annular section, then through an axial gap parallel to the bearing shell 12, with the ceramic roller bearings 11 flowing around and finally leaves the drive part 2 through a discharge pipe 20.
  • the gas flow channel 18 is also parallel via an annular connecting channel 21 to the drive shaft 4 with the sealing gap 5 between the stator ring 3 and the drive shaft 4 in connection.
  • the admission pressure for the hot gas at the supply nozzle 19 is chosen so high that the static pressure of the superheated steam in the Connection gap 21 is above the pressure of the pumped medium in the gear pump 6. This can be avoided with certainty that the hot, aggressive fluid, such as a molten salt, gets through the sealing gap 5 and the mechanical seal 17 into the drive part 2.
  • the drive part can be made of metal except for the ceramic roller bearings 11, which is a decisive advantage of the invention.
  • the running surfaces of the roller bearing 11 are advantageously coated with a carbon film to reduce the sliding friction.
  • the pump according to the invention is based on the following operating principle:
  • the pumped medium for example a molten salt with a temperature of 500 ° C.
  • the pump shaft 4 is guided through the stator ring 3 with a small clearance (sealing gap 5).
  • the stator ring 3 separates the pump body 1 and the drive part 2 of the pump from one another except for the slight gap with respect to the pump shaft 4 or the pump body 1.
  • the drive part 2 is now steam at a pressure of 5.1 bar and a temperature of 180 ° C pressure controlled supplied, which leaves the drive part 2 via the gas discharge pipe 20 again.
  • the excess pressure of the steam in the drive part 2 prevents the liquid salt melt from passing through the sealing gap 5 between the stator ring 3 and the pump shaft 4, as well as the stator ring 3 and the pump body 1.
  • a small amount of steam flows from the drive part 2 into the molten salt, which is located in the pump body 1.
  • the small amount of steam flowing into the salt melt can be tolerated, insofar as the salt melt is neither chemically influenced, nor is the gear pump negatively affected by the vapor bubbles contained in the salt melt.
  • the superheated steam which flows through the drive part 2 has an important second function: it guarantees the important direct cooling of the pump magnets 16 and the dry running bearings 11 to temperatures below 350 ° C.
  • the vapor blocking of the drive part 2 effectively prevents the penetration of molten salt at 500 ° C. into the drive part 2 and cools the pump magnets 16 for dissipating heat flowing from the pump body 1 into the drive part 2 so that their function is not impaired.
  • the bearings 11 are also intensively cooled with superheated steam.
  • All components present in the drive part 2 have no contact with the pumped medium and, with the exception of the ceramic and dry-running bearing 11, can be made of ordinary stainless steel, for example.
  • the steam used in the drive part 2 of the pump, which heats up in the pump, can then be used further.
  • the pump should preferably be operated in an upright position so that the pump body 1 is located below and the drive part 2 is arranged above it.
  • the entire pump body 1 is electrically heated from the outside in order to keep the pump at the working temperature and to prevent thermal stresses in the ceramic components.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rotary Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
EP95113673A 1994-09-13 1995-08-31 Pompe pour fluides chauds et corrosifs Expired - Lifetime EP0702155B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4432551A DE4432551A1 (de) 1994-09-13 1994-09-13 Pumpe zur Förderung heißer, korrosiver Medien
DE4432551 1994-09-13

Publications (3)

Publication Number Publication Date
EP0702155A2 true EP0702155A2 (fr) 1996-03-20
EP0702155A3 EP0702155A3 (fr) 1997-01-08
EP0702155B1 EP0702155B1 (fr) 2001-11-07

Family

ID=6528081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95113673A Expired - Lifetime EP0702155B1 (fr) 1994-09-13 1995-08-31 Pompe pour fluides chauds et corrosifs

Country Status (6)

Country Link
US (1) US5569024A (fr)
EP (1) EP0702155B1 (fr)
JP (1) JPH0893639A (fr)
CA (1) CA2157843A1 (fr)
DE (1) DE4432551A1 (fr)
ES (1) ES2167390T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2426036A (en) * 2005-05-10 2006-11-15 Bernard Whicher Vertical Northey compressor
CN104329251A (zh) * 2014-10-30 2015-02-04 江苏海天泵阀制造有限公司 一种微型超低温磁力驱动齿轮泵

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5725362A (en) * 1995-05-09 1998-03-10 Xolox Corporation Pump assembly
DE19543325A1 (de) * 1995-11-21 1997-05-22 Bayer Ag Pumpe für heiße korrosive Schmelzen
US7287398B2 (en) * 2001-09-25 2007-10-30 Alsius Corporation Heating/cooling system for indwelling heat exchange catheter
US6174151B1 (en) * 1998-11-17 2001-01-16 The Ohio State University Research Foundation Fluid energy transfer device
JP2001132411A (ja) * 1999-11-04 2001-05-15 Honda Motor Co Ltd 膨脹器の出力軸と被動機側の伝動軸との連結構造
US6612821B1 (en) * 2000-07-14 2003-09-02 Fluid Management, Inc. Pump, in particular gear pump including ceramic gears and seal
US6997688B1 (en) 2003-03-06 2006-02-14 Innovative Mag-Drive, Llc Secondary containment for a magnetic-drive centrifugal pump
JP4245997B2 (ja) * 2003-07-07 2009-04-02 直樹 宮城 小形ギアポンプ
JP4640190B2 (ja) * 2006-01-20 2011-03-02 株式会社豊田自動織機 水素循環用電動ポンプ
EP2297464A1 (fr) * 2008-04-28 2011-03-23 Randell Technologies Inc. Ensemble rotor pour compresseur rotatif
US8646382B2 (en) * 2009-05-05 2014-02-11 Pearl City Manufacturing, Inc. Convection recirculating fryer for cooking foods
CN102939436B (zh) 2010-05-05 2016-03-23 能量转子股份有限公司 流体能量转换装置
US8714951B2 (en) * 2011-08-05 2014-05-06 Ener-G-Rotors, Inc. Fluid energy transfer device
ITPD20120320A1 (it) * 2012-10-29 2014-04-30 Pumps Srl M Pompa per altissime temperature
US10808694B2 (en) * 2016-08-15 2020-10-20 Georgia Tech Research Corporation Systems and devices for pumping and controlling high temperature fluids
CN109113950B (zh) * 2017-06-26 2020-08-25 比亚迪股份有限公司 电动油泵总成、转向系统和润滑系统
US12203475B2 (en) * 2022-08-23 2025-01-21 Saudi Arabian Oil Company Magnetic drive sealless pumps with steam jacket

Citations (2)

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Publication number Priority date Publication date Assignee Title
DE8711555U1 (de) 1987-08-26 1987-10-08 Lederle GmbH Pumpen- und Maschinenfabrik, 7803 Gundelfingen Pumpenaggregat, insbesondere zum Fördern heißer Fördermedien
DE4212982A1 (de) 1992-04-18 1993-10-21 Lederle Pumpen & Maschf Pumpe für heiße Fördermedien

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Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8711555U1 (de) 1987-08-26 1987-10-08 Lederle GmbH Pumpen- und Maschinenfabrik, 7803 Gundelfingen Pumpenaggregat, insbesondere zum Fördern heißer Fördermedien
DE4212982A1 (de) 1992-04-18 1993-10-21 Lederle Pumpen & Maschf Pumpe für heiße Fördermedien

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2426036A (en) * 2005-05-10 2006-11-15 Bernard Whicher Vertical Northey compressor
CN104329251A (zh) * 2014-10-30 2015-02-04 江苏海天泵阀制造有限公司 一种微型超低温磁力驱动齿轮泵

Also Published As

Publication number Publication date
US5569024A (en) 1996-10-29
CA2157843A1 (fr) 1996-03-14
EP0702155B1 (fr) 2001-11-07
JPH0893639A (ja) 1996-04-09
DE4432551A1 (de) 1996-03-14
EP0702155A3 (fr) 1997-01-08
ES2167390T3 (es) 2002-05-16

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