EP2904269A1 - Double-cloche d'entrefer et procédé de surveillance d'une double-cloche d'entrefer - Google Patents

Double-cloche d'entrefer et procédé de surveillance d'une double-cloche d'entrefer

Info

Publication number
EP2904269A1
EP2904269A1 EP13760051.6A EP13760051A EP2904269A1 EP 2904269 A1 EP2904269 A1 EP 2904269A1 EP 13760051 A EP13760051 A EP 13760051A EP 2904269 A1 EP2904269 A1 EP 2904269A1
Authority
EP
European Patent Office
Prior art keywords
pot
double
gap
thermocouple
monitoring
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
EP13760051.6A
Other languages
German (de)
English (en)
Other versions
EP2904269B1 (fr
Inventor
Jürgen KONRAD
Andreas Russ
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.)
Dickow Pumpen & Co Kg GmbH
Original Assignee
Dickow Pumpen 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 Dickow Pumpen KG filed Critical Dickow Pumpen KG
Publication of EP2904269A1 publication Critical patent/EP2904269A1/fr
Application granted granted Critical
Publication of EP2904269B1 publication Critical patent/EP2904269B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F04D13/021—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
    • F04D13/025—Details of the can separating the pump and drive area

Definitions

  • the present invention relates to a double-gap pot, in particular for installation in a magnetic coupling arrangement and a method for monitoring a double-gap pot.
  • splitters are used as a component in magnetic clutches in pumps, agitators, fans, mixers, centrifuges, etc. which are used in particular in the chemical industry and in reactor technology in dealing with aggressive, toxic or explosive media.
  • European Patent Application EP 0 286 822 A2 describes a double-shell containment shell for a magnetic pump drive in which an inner pot and an outer pot touch in the region of their cylindrical outer surfaces. Between the two lateral surfaces a so-called road network is arranged, which represents a kind of sewer system for a monitoring medium, with which the integrity of the two pot trays can be monitored.
  • European Patent Application EP 1 777 414 A1 also describes a double-shell containment shell for a magnetic pump drive, between the two shells of which a channel network for a liquid medium is arranged such that it fills the intermediate space between the outer pot and the inner pot.
  • This arrangement is intended to ensure the thermal conductivity between the pots, so that accumulating heat can be reliably discharged via the inner pot to the medium to be pumped by the pump.
  • the systems mentioned have disadvantages.
  • the system-induced eddy currents of the rotating magnetic coupling lead to an increase in temperature in the containment shell.
  • the heating of the inner pot can be dissipated by an inner, circulating liquid stream.
  • the heat of the outer pot can not be sufficiently dissipated.
  • DE 603 19 668 T2 describes a manufacturing method of a rear housing or split pot made of two layers of a thermoplastic material with or without fibrous reinforcing materials.
  • the invention has for its object to provide a containment shell, in which the disadvantages known from the prior art avoided or at least greatly reduced and with which a monitoring of a double-gap pot on safe operation is possible.
  • the object is achieved with a split pot according to claim 1, namely a double-gap pot, in particular for installation in a magnetic coupling arrangement, with an inner pot and an outer pot, the walls of which include a gap with a cylindrical portion, wherein the cylindrical portion with a particular solid insert of a Material with high thermal conductivity, in particular a graphite insert is filled.
  • the temperature increase of the outer pot resulting from the eddy current losses during operation of the coupling can be very well inwardly diverted to the inner pot due to the high thermal conductivity of graphite and can be dissipated by the liquid flow of the pumped medium circulating inside the pump.
  • graphite has a high chemical corrosion resistance against almost all conceivable pumped media.
  • the graphite insert of the double-slit pot has an insulated thermocouple, which is designed in particular as a thermocouple wire on.
  • This arrangement has the advantage that in the event of leakage in the inner pot and the outer pot, the insulation of the thermocouple attacked or this is resolved by a chemical attack, the stripped bare spot of the thermocouple, or thermocouple wire rests either on the inner or outer pot. This leads to a rollover, which can be evaluated by measurement.
  • thermocouple is connected via a conductor to a connection socket, which is suitable for communication with a measuring device.
  • the connected to the thermocouple conductor can be pulled out of the gap to the outside and performed for monitoring purposes to a measuring device.
  • This can advantageously with the thermocouple z. B. subsequent monitoring be performed: the aforementioned leakage monitoring, wire breakage by a damaged inner or outer pot, caused z. B. by a dragging inner or outer magnet and a temperature rise in the clutch.
  • the (standard) resistance is determined or calibrated in the assembled state at room temperature. Any temperature change will also result in a change in resistance.
  • thermocouple which is in particular designed as a thermocouple wire, according to one of claims 1 to 3 proposed.
  • This method advantageously ensures a simple and economical operation of a double-gap pot.
  • Fig. 1 shows schematically a sectional view of a pump of the prior art, in which a arranged in a magnetic coupling double-gap pot is shown.
  • Fig. 2 shows schematically a Doppelspalttopf invention in a perspective partial sectional view.
  • FIG. 3 shows the double-slit pot according to FIG. 2 in a section running through its longitudinal axis.
  • FIG. 4 shows a detail of the double-slit pot according to FIG. 3 at the top left, greatly enlarged in section, with the details of the arrangement according to the invention being highlighted.
  • Fig. 1 shows the basic structure of a magnetic coupling M according to the prior art, installed in a centrifugal pump KP.
  • the pumped fluid of the pump is hermetically sealed against the atmosphere by a double-slotted pot S. There is no shaft passage to the outside.
  • the required drive power is transmitted from the motor (not shown) via external magnets AM to an internal magnetic coupling and thus to the impeller LR of the pump.
  • Inner IM and outer AM magnets are non-positively connected by field lines and run synchronously with each other. There is no slippage.
  • the engine speed corresponds to the clutch speed. Since the magnetic field lines intersect the standard metallic containment shell S, owing to the electrical conductivity of the material, eddy current losses occur which translate into heat and lead to an increase in the gap top temperature. This temperature increase must be dissipated by an internal circulation flow.
  • FIG. 2 shows a double-slit pot S according to the invention, with an inner wall 1 and an outer wall 2, the walls of which enclose a gap Z with a cylindrical region.
  • FIG. 3 shows the double-slit pot according to FIG. 2 in a section running through its longitudinal axis.
  • FIG. 4 In the detail of an advantageous development of a double-walled containment shell according to the invention shown in FIG. 4, the details of an advantageous development of a double-walled containment shell according to the invention are shown greatly enlarged.
  • the area Z between the inner pot 1 and the outer pot 2 - ie the gap Z, the inner pot 1 and outer pot 2, or enclose their cylindrical walls - is filled, for example, with a solid graphite insert 3.
  • Graphite has the advantage of high thermal conductivity and chemical corrosion resistance to almost all media.
  • a very thin insulated thermocouple wire 4 is introduced, or z. B. woven, which is led out of the cylindrical region Z to the outside and out for monitoring purposes in a connector socket 6, from which a connection to a (not shown) monitoring device can be created.
  • a cable gland is secured to the outside via two seals 5.
  • the material of the outer split pot 2 may be made of plastic or fiber-reinforced plastic instead of metal.
  • the example, solid graphite insert 3 may also consist of a introduced into the space Z powder, which is solidified in a suitable method.
  • thermocouple or the thermocouple wire 3, 4 advantageously z. B. subsequent monitoring be performed: the aforementioned leakage monitoring, broken wire through a damaged inner or outer pot, caused z. B. by a dragging inner or outer magnet, as well as a temperature rise in the clutch.
  • the (standard) resistance is determined or calibrated in the assembled state at room temperature. Any temperature change will also result in a change in resistance.
  • thermocouple wire 3, 4 attacked or dissolves it by a chemical attack
  • the stripped bare spot of the wire is either on the inner pot 1 or 2 on the outer pot. It comes to an electrical flashover, which can be evaluated metrologically. There is a broken wire through a damaged inner pot 1 or outer pot 2, caused for example by a dragging inner or outer magnet detectable.
  • Measurement of a temperature increase The resistance is determined or calibrated in the assembled state at room temperature. Any temperature change will also result in a change in resistance.
  • the inner pot 1, the outer pot 2 and the graphite insert 3 are non-positively connected with each other. Due to the very good thermal conductivity of the solid intermediate layer 3, the temperature increase of the outer pot 2 resulting from the eddy current losses can be dissipated inwards and be further dissipated by the liquid flow circulating inside the pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne une double-cloque d'entrefer destinée notamment à être installée dans un ensemble à entraînement magnétique, et comprenant une cloche interne (1) et une cloche externe (2), dont les parois délimitent un espace intermédiaire (Z) ayant une zone cylindrique, la zone cylindrique étant remplie par un insert notamment solide réalisé dans un matériau de thermo-conductivité élevée, notamment par un insert en graphite (3), caractérisée en ce que l'espace intermédiaire (Z) présente un couple thermoélectrique isolé qui est conçu notamment comme un fil de thermocouple (4).
EP13760051.6A 2012-10-02 2013-09-11 Double-cloche d'entrefer et procédé de surveillance d'une double-cloche d'entrefer Active EP2904269B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012019423A DE102012019423B3 (de) 2012-10-02 2012-10-02 Doppelspalttopf
PCT/EP2013/068843 WO2014053290A1 (fr) 2012-10-02 2013-09-11 Double-cloche d'entrefer et procédé de surveillance d'une double-cloche d'entrefer

Publications (2)

Publication Number Publication Date
EP2904269A1 true EP2904269A1 (fr) 2015-08-12
EP2904269B1 EP2904269B1 (fr) 2018-11-14

Family

ID=49162155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13760051.6A Active EP2904269B1 (fr) 2012-10-02 2013-09-11 Double-cloche d'entrefer et procédé de surveillance d'une double-cloche d'entrefer

Country Status (3)

Country Link
EP (1) EP2904269B1 (fr)
DE (1) DE102012019423B3 (fr)
WO (1) WO2014053290A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014223875A1 (de) * 2014-11-24 2016-05-25 Robert Bosch Gmbh Gehäuse geeignet für die Aufnahme einer Antriebseinheit eines Elektromotors
DE102018113636B4 (de) * 2018-06-07 2020-02-13 Klaus Union Gmbh & Co. Kg Magnetgekuppelte Pumpe mit doppelschaligem Spalttopf
DE102019002797A1 (de) 2019-04-17 2020-10-22 KSB SE & Co. KGaA Spalttopf
DE102020201998B4 (de) * 2020-02-18 2024-02-22 Eagleburgmann Germany Gmbh & Co. Kg Spalttopf mit integrierter Kühlung oder Heizung
DE102022001932A1 (de) * 2022-06-03 2023-12-14 KSB SE & Co. KGaA Gedämpfter Volumenkörper

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3639719C3 (de) * 1986-11-20 1994-02-24 Hermetic Pumpen Gmbh Spaltrohrmagnetpumpe
DE3704671A1 (de) * 1987-02-14 1988-08-25 Richter Chemie Technik Gmbh Leckanzeigevorrichtung fuer eine magnetkreiselpumpe
DE3712459A1 (de) * 1987-04-11 1988-10-27 Klaus Union Armaturen Magnetischer pumpenantrieb
DE4438132A1 (de) * 1994-10-27 1996-05-02 Wilo Gmbh Spaltrohrpumpe
US6293772B1 (en) * 1998-10-29 2001-09-25 Innovative Mag-Drive, Llc Containment member for a magnetic-drive centrifugal pump
JP3877211B2 (ja) * 2003-03-20 2007-02-07 株式会社イワキ マグネットポンプにおけるリアケーシングの製造方法
ES2741644T3 (es) * 2005-10-21 2020-02-11 Klaus Union Gmbh & Co Kg Accionamiento de bomba magnético
IT1401566B1 (it) * 2010-08-03 2013-07-26 3Mpumps Srl Ora M Pumps Srl Dispositivo per la trasmissione di potenza mediante campi magnetici rotanti.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014053290A1 *

Also Published As

Publication number Publication date
WO2014053290A1 (fr) 2014-04-10
EP2904269B1 (fr) 2018-11-14
DE102012019423B3 (de) 2013-12-05

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