WO2024256434A1 - Pompe pour liquide cryogénique - Google Patents

Pompe pour liquide cryogénique Download PDF

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Publication number
WO2024256434A1
WO2024256434A1 PCT/EP2024/066166 EP2024066166W WO2024256434A1 WO 2024256434 A1 WO2024256434 A1 WO 2024256434A1 EP 2024066166 W EP2024066166 W EP 2024066166W WO 2024256434 A1 WO2024256434 A1 WO 2024256434A1
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WO
WIPO (PCT)
Prior art keywords
rotor
motor
pump according
bearing
conveyor pipe
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.)
Ceased
Application number
PCT/EP2024/066166
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German (de)
English (en)
Inventor
Tabea Arndt
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.)
Karlsruher Institut fuer Technologie KIT
Original Assignee
Karlsruher Institut fuer Technologie KIT
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 Karlsruher Institut fuer Technologie KIT filed Critical Karlsruher Institut fuer Technologie KIT
Publication of WO2024256434A1 publication Critical patent/WO2024256434A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • 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
    • F04D13/0606—Canned motor pumps
    • F04D13/0633—Details of the bearings
    • 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
    • F04D13/0606—Canned motor pumps
    • F04D13/064—Details of the magnetic circuit
    • 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
    • F04D13/0646—Units comprising pumps and their driving means the pump being electrically driven the hollow pump or motor shaft being the conduit for the working fluid
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid 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
    • F04D3/00—Axial-flow 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
    • F04D3/00—Axial-flow pumps
    • F04D3/02—Axial-flow pumps of screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/0408—Passive magnetic bearings
    • F16C32/0436—Passive magnetic bearings with a conductor on one part movable with respect to a magnetic field, e.g. a body of copper on one part and a permanent magnet on the other part
    • F16C32/0438—Passive magnetic bearings with a conductor on one part movable with respect to a magnetic field, e.g. a body of copper on one part and a permanent magnet on the other part with a superconducting body, e.g. a body made of high temperature superconducting material such as YBaCuO
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C37/00—Cooling of bearings
    • F16C37/005—Cooling of bearings of magnetic bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K55/00—Dynamo-electric machines having windings operating at cryogenic temperatures
    • H02K55/02—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type
    • H02K55/04—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type with rotating field windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/048—Bearings magnetic; electromagnetic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/50—Intrinsic material properties or characteristics
    • F05D2300/507—Magnetic properties
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/09—Structural association with bearings with magnetic bearings

Definitions

  • the invention relates to a pump for a cryogenic liquid or liquid mixture in a conveyor pipe with a motor according to the first patent claim.
  • Cryogenic liquids are substances that have been liquefied by cooling and have boiling points, in particular below 150 Kelvin. In the context of this application, these cryogenic liquids are also restricted to substances that have a melting point below the transition temperature T c of superconductors. In the context of this application, the transition temperature T c is preferably between 40K and 110K (current upper limit of 110K given by HTS BSCCO, no HTS with higher transition temperatures known).
  • Important cryogenic liquids are in particular helium (boiling point 4.222 K), hydrogen (boiling point 20.268 K), nitrogen (boiling point 77.35 K), argon (boiling point 87.15 K) or oxygen (boiling point 90.18 K).
  • US 11242853 B2 discloses, by way of example, a pump for liquid refrigerants with a pump body which is driven by a motor in the pump housing via mechanical transmission means.
  • DE 1 653 448 A1 discloses a pump for cryogenic liquids with a piston made of a superconducting material. The piston is arranged in a cylinder, at each end of which there is a free volume with an inlet and an outlet valve for the liquids. The piston is moved back and forth by means of an alternating electromagnetic field, whereby the two free volumes cyclically increase and decrease and cause a pumping effect via the valves.
  • piston pumps do not produce constant but pulsating fluid flows.
  • Pumps for cryogenics are designed to transport extremely cold liquids (or gases) as efficiently as possible and with minimal heat input. Heat loads are particularly caused by
  • one object of the invention is to propose a pump for a cryogenic liquid or liquid mixture which is suitable for generating a constant liquid flow while reducing heat losses.
  • the object is achieved with a pump having the features of claim 1. Subclaims with reference to this describe advantageous embodiments.
  • the pump comprises a motor stator, a rotor and a rotary bearing for the rotor. It is important that the motor stator forms part of the conveyor pipe or is arranged around the conveyor pipe.
  • the rotor comprises a motor rotor and at least one fluid-mechanical conveyor element for converting a rotation of the rotor into a fluid flow in the conveyor pipe.
  • the rotor is located completely inside the conveyor pipe, at least the motor rotor is also located inside the motor stator.
  • the rotor is preferably rotatable about a rotation axis by means of the rotary bearing and is mounted concentrically to the surrounding and preferably straight conveyor pipe section.
  • a key basic idea is therefore the integration of the drive motor in the conveyor pipe, whereby the stator is arranged around the pipe or forms the conveyor pipe wall and the rotor is arranged in the pipe and at least the motor rotor rotates in the pipe in the magnetic field of the stator.
  • the rotor, fluid-mechanical conveyor element and any mechanical elements in between are the only mechanically rotating parts that are arranged entirely in the conveyor pipe.
  • the liquid flow flows around them and are advantageously not at all suitable for forming a cold bridge between the liquid flow and the environment outside the conveyor pipe.
  • An essential feature of the pump concerns the motor rotor, which has a cage rotor made of a high-temperature superconductor (HTS), preferably strip-shaped HTS RE-123 (REBaCuO), strip-shaped HTS Bi-2223 or Bi-2212 (each a compound of BiSrCaCuO), which can preferably be cooled down to below its critical transition temperature by the cryogenic liquid that flows around the rotor with the motor rotor.
  • the cryogenic liquid thus ensures that the resistance in the HTS disappears and so enables the HTS to be operated, for example, in the so-called Shubnikov phase with non-vanishing magnetization and loss-free current densities. Heat loads due to ohmic losses are thus drastically reduced.
  • motor stator which generates a rotating electromagnetic (alternating) field. It preferably comprises motor stator windings made of copper.
  • a pump equipped with this feature includes a squirrel cage motor which operates particularly effectively and in a novel way in synchronous operation (zero slip).
  • Squirrel cage motors have a so-called cage in the motor rotor (rotor) with several struts made of the aforementioned HTS arranged around the rotor circumference.
  • the struts are distributed at equal distances from one another around the rotor circumference and are preferably aligned axially parallel (or at a small angle to avoid cogging torques) to the axis of rotation.
  • An optional design provides a cage with two circumferential end rings, which are also preferably made of the aforementioned HTS and which each short-circuit one of the two ends of all the struts.
  • the struts and end rings are preferably one piece or form a continuous coating.
  • a preferred embodiment provides for longitudinally slotted struts.
  • the struts preferably have only one central longitudinal slot, which divides the strut into two half-struts, which more preferably each have a constant and identical cross-section.
  • the ends of the struts remain unprotected, whereby the aforementioned end rings are preferably omitted.
  • Each of these struts then forms a superconducting ring conductor; the use of HTS means that the motor rotor is a synchronously operating squirrel-cage rotor. Power supplies to the motor rotor are not required.
  • the width of the slots and the distances between the unconnected strut pairs in the circumferential direction determine the number of poles and the magnetic flux densities across the rotor casing.
  • the colder cryogenic region comprises the rotor, which is arranged completely inside the conveyor pipe and is surrounded by the cryogenic liquid there, and can then advantageously be operated in a superconducting manner.
  • the motor stator and the bearing stators are preferably arranged with copper windings to generate magnetic fields acting on the rotor, which can then preferably be operated in the non-superconducting temperature range (advantage: lower cryogenic losses).
  • a particularly advantageous feature here is the lack of fixed contacts such as electrical sliding contacts, shaft feedthroughs or rolling or plain bearings through the conveyor pipe wall to the rotor, as possible heat transfer bridges between the two aforementioned regions.
  • the proposed designs do not follow the general topology of conventional rotors; the struts and end rings in particular have no electrical contact and thus, in the proposed application area, are also advantageous no heat transfer elements from the conveyor pipe. It is indicated that end rings can be dispensed with in the proposed squirrel cage rotors due to the stable magnetization of the synchronous stator field.
  • the latter only occurs, however, if the aforementioned struts and ring conductors are made of non-superconducting materials.
  • cryogenic liquids such as the present use as a cryopump, the use of motor rotors with non-superconducting materials is therefore prohibited due to the heat generated and dissipated by the liquid.
  • RRR values between 100 and 200 are achievable for very pure metals.
  • Associated with the residual electrical resistance R when operated with an electric current / is the ohmic heat load E ohm RI .
  • conventional ferrite magnets in a conventional, permanently magnetically excited rotor permanently (irreversibly) lose some of their magnetization at temperatures below -40°C and are therefore unsuitable for cryogenic liquids.
  • Alternative neodymium magnets also show a non-linear magnetization curve as the temperature decreases, which also rules out their use.
  • cryogenic temperatures below -138 °C the magnetization is reversibly reduced by around 10 to 20% by a change in the direction of magnetization.
  • a deterioration (embrittlement) of the mechanical properties at low temperatures must also be taken into account.
  • the use of permanent magnets in the motor rotor of cryogenic fluid pumps is possible in principle, but significantly reduces their performance at the low temperatures prevailing in cryogenic liquids.
  • the motor rotor preferably comprises at least one of the fluid-mechanical conveying elements and/or connecting means between the motor rotor and the at least one fluid-mechanical conveying element.
  • the connecting means form a preferably rigid coupling of the motor rotor and conveying elements in the pump.
  • the cryogenic liquid is preferably a liquid or liquid mixture whose boiling point is below the critical transition temperature of the HTS of the struts and the end rings.
  • the cryogenic liquid is in a liquid state, i.e. together with the motor rotor, in a temperature range below the critical transition temperature.
  • the superconducting properties of the motor rotor are advantageously ensured by the cryogenic fluid flow and at the same time no cold bridge is created apart from the conveyor pipe wall.
  • the motor stator can be operated with an alternating electromagnetic field, whereby the alternating field frequency together with the slot and pole numbers determines the speed of the motor rotor.
  • the bearings of the rotor are preferably passive magnetic bearings as rotational bearings, each with a bearing rotor made of a superconducting material in a preferably stationary magnetic field of a bearing stator.
  • the motor rotor is mounted with the rotor in the conveyor pipe, i.e. its mobility is guided by a rotary bearing.
  • the rotary bearing preferably has one or more passive magnetic bearings.
  • a rotating bearing rotor made of a superconducting material is preferably mounted without contact as a component of the rotor in a magnetic field of a bearing stator with permanent and/or electromagnets in or around the conveyor pipe.
  • the bearing rotors are advantageously arranged completely in the liquid flow and are tempered by it.
  • the use of magnetic bearings avoids or reduces mechanical contact with components that are in contact with the conveyor pipe or other areas that are warmer than the temperature of the cryogenic liquid. This also reduces the heat input into the rotor through heat conduction.
  • a preferred embodiment provides a rotation bearing for the rotation of the rotor only about a rotation axis concentric to the conveyor pipe.
  • the warmer part of the magnetic bearing comprises the bearing stator, where the magnets are preferably are arranged outside the conveyor pipe and in this position can preferably be carried out with conventional magnets and/or electromagnetic coils.
  • the pump with the aforementioned features is an axial pump with a rotating rotor, which conveys the fluid flow in the delivery pipe at least predominantly, preferably completely axially, i.e. parallel to the axis of rotation.
  • a rotating rotor which conveys the fluid flow in the delivery pipe at least predominantly, preferably completely axially, i.e. parallel to the axis of rotation.
  • the motor rotor comprises at least one of the fluid-mechanical conveying elements. They are preferably incorporated into the motor rotor as threads or placed on it as blades or inserted into it as impellers.
  • connecting means are provided between the motor rotor and the at least one fluid-mechanical conveying element.
  • the connecting means preferably comprise the aforementioned rotor shaft, which serves as a carrier for the motor rotor and the at least one conveying element arranged axially in front of or behind it.
  • the motor stator comprises motor stator windings made of copper.
  • the proposed solution has the following properties, characteristics and advantages:
  • HTS high-temperature superconductors
  • a temperature of the cryogenic liquid below the critical temperature of the HTS is necessary (e.g. in the case of liquid hydrogen 21 K compared to the HTS RE-123 with 92 K).
  • Fig. la and b are basic sectional views of an embodiment of a pump with the delivery pipe, rotor according to a first basic form of the rotor as well as bearing and motor stator,
  • Fig. 2 shows an exemplary rotor according to a further embodiment of the first basic form
  • Fig. 3a and b show exemplary rotors according to a second basic form
  • Fig. 4 shows an exemplary tubular rotor according to a third basic form
  • Fig. 5 shows an exemplary rotor according to a fourth basic form
  • Fig. 6a to c show various designs of the motor rotor in detail in the preferred squirrel cage design.
  • the proposed pump comprises, in the embodiments shown in Fig. 1a and 1b, a rotor 1 comprising two bearing rotors 2, a motor rotor 3 and two fluid-mechanical conveying elements 4 on a rotor shaft 5.
  • the rotor is inserted axially into a conveying pipe 7 so as to be rotatable about a rotation axis 6 and is guided by a bearing stator 8.
  • a motor stator 9 serves to generate a rotating magnetic field in which the motor rotor is positioned and is driven in rotation.
  • the two fluid-mechanical conveying elements 4 shown are each mounted on the end of the rotor shaft in the embodiments shown as flow screws, the flow generated being guided through axial recesses 10 or openings 11 through the bearing rotors and the motor rotor, indicated by dashed lines. Further design options for the fluid-mechanical conveying elements are described below using four basic shapes of the rotor.
  • the motor rotor is completely surrounded by the cryogenic liquid inside the conveyor tube and has neither a power supply, e.g. electrical sliding contacts, nor any other mechanical transition as a thermal bridge from the inside of the conveyor tube.
  • the rotor takes on the temperature of the surrounding cryogenic liquid, while heat exchange to significantly warmer areas in or around the conveyor tube does not take place via solid-state contact. This advantageously improves the thermal separation of a A colder region, comprising the rotor with the cryogenic liquid, from a warmer region adjacent thereto, comprising the motor and bearing stators operable in non-cryogenic temperature ranges.
  • the conveyor pipe itself is preferably made of a material with low conductivity, preferably a plastic or a material composite with at least one plastic layer.
  • Bearing stators 8 and motor stator 9 are either placed on the outside of the conveyor tube ( Fig. 1a) or inserted and form the inner wall of the conveyor tube ( Fig. 1b).
  • the inner wall of the conveyor pipe with a thermal insulation layer (not shown in Fig. 1a and b), whereby an undesirable heat transfer between the cryogenic liquid in the interior (colder region) to the motor stator and the bearing stator (warmer region) is advantageously further reduced.
  • Fig. la and b are optional designs in which only the motor stator or only the bearing stators are inserted into the conveyor tube and form the inner wall of the conveyor tube, while the remaining stators are placed on the conveyor tube.
  • rotors with optionally different basic shapes or other embodiments, which are explained in more detail below.
  • the motor rotor is mounted in the conveyor pipe via a rotary bearing with a bearing stator and bearing rotor, which interact magnetically with each other and not only The rotor should be guided radially but also axially in the conveyor pipe.
  • a gap flow bearing is also suggested as an option or in addition.
  • Fig. 1a and b and 2 represent the first basic form in the form of a first embodiment. It has a rotor shaft 5 which is arranged inside a preferably straight section of the conveyor pipe 7, more preferably concentrically in this section.
  • the rotor 1 is preferably supported by the rotor shaft 5, more preferably by means of two bearings (motor stator 9 and bearing rotor 2) on both sides of the motor rotor 3 in the conveyor pipe.
  • At least one fluid-mechanical conveying element 4 for converting a rotation of the rotor shaft 5 into a fluid flow is mounted axially in the section on the rotor shaft.
  • the fluid-mechanical conveying means 4 are preferably a propeller or conveying screws as shown (cf. Fig. 1a and b).
  • a second preferred embodiment of the rotor shaft is shown in Fig. 2. It provides a tube 12 open on both sides as the rotor shaft 5 as a carrier for the motor rotor 3 and the bearing rotors 4.
  • the fluid-mechanical conveying elements 4 preferably comprise at least one impeller 13 in the tube, either as the only conveying element or - as shown - in addition to a conveying element such as a propeller 14 on the rotor shaft.
  • the rotor shaft serves as a connecting means between the motor rotor and the at least one fluid-mechanical conveying element, preferably all conveying elements.
  • the second basic form represented by Fig. 3a and b in the example of a second embodiment, provides a motor rotor 3 with at least one incorporated conveying element 16 (cf. Fig. 3a) or attached conveying element (cf. Fig. 3b), which is preferably arranged evenly around the motor rotor.
  • conveying elements are supported by ring-shaped impeller inserts 15 in axial openings in the two bearing rotors 2 .
  • the impeller inserts mentioned also serve as a carrier for a bearing rotor attached to them in a ring shape.
  • the fluid flow flows around the motor rotor in a sheath flow.
  • a preferred embodiment according to Fig. 3a provides continuous helical grooves 16 as a fluid-mechanical conveying element in the motor rotor, i.e. incorporated in the outer surface of the motor rotor 3.
  • Conveying elements and motor rotor are preferably a single component, i.e. the conveying elements are integral parts of the motor rotor.
  • An alternative preferred embodiment according to Fig. 3b preferably provides helical flow guide elements 17, placed on the outer surface of the motor rotor 3.
  • the motor rotor is preferably mounted in the conveyor pipe via a separately provided rotor shaft 5 as described.
  • the third basic form represented by Fig . 4 in the example of a third embodiment without motor shaft , shows a preferably tubular motor rotor 3 with integrated bearing rotor 2 and, in the example shown, helical grooves 16 incorporated therein as well as impellers 13 inserted into an (optional) central axial inner bore 18 as fluid mechanical conveying elements 4.
  • the motor rotor extends axially both over the motor stator 9 and over the two bearing stators 8.
  • the fourth basic form represented by Fig. 5 in the example of a fourth embodiment, provides for a necessarily tubular motor rotor 3 with tubular bearing rotors 2 attached on both sides, which together form a rotor tube 19 .
  • a rotor shaft is not provided and is not required here either.
  • At least one impeller 13 is inserted into the rotor tube as the only fluid-mechanical element 4 .
  • Fig. 6a to c show various designs of the motor rotor in detail in the preferred squirrel cage design with a superconducting cage 20 preferably made of an HTS on a preferably metallic base body 21.
  • the cage is applied as an HTS layer to the preferably iron-containing base body.
  • Fig. 6a and b represent a first design of the cage 20 with struts 22 on the circumference of the tube, which open into an end ring 23 on both sides and form a common HTS layer on the base body.
  • the struts are not applied in a straight line, but curved, with the areas between the struts preferably being used for attached helical flow guide elements (cf.
  • Fig. 3b Pos. 17). and/or incorporated helical grooves are available as at least part of the fluid-mechanical conveying elements.
  • a preferred embodiment provides for an alternating sequence of the said flow guide elements and grooves.
  • Fig. 6c shows the aforementioned alternative design of the cage 20, applied as an HTS layer to the metallic base body 21.
  • the cage comprises axial struts 22 (or with a small tilt angle of a maximum of 30°, preferably of a maximum of 15°, more preferably a maximum of 10° or 5° to the axis of rotation) arranged at equal distances from one another on the circumference without end rings, which are each separately divided into two partial struts by a longitudinal slot 24 except for the two end regions 25, thus each forming a superconducting ring conductor.
  • a design of this design (not shown in detail) provides for a helical arrangement of the struts over the circumference of the base body instead of an axial arrangement, wherein the intermediate spaces can be used for fluid-mechanical conveying elements as described above.
  • a special and surprising effect of these designs of the cage, in particular the last one according to Fig. 6c, is the advantageous realization or support of synchronous operation (with vanishing slip), preferably even without the formation of induction loops via end rings.
  • a special effect of the use of superconductors is the formation of circular currents in the struts 22 even without a complete cage structure, and thus the synchronous rotation of the rotor and the function of the machine similar to that of a machine excited by a permanent magnet. This type of operation is novel and not known from previous induction machines (complete squirrel cage machines).
  • the base body does not necessarily have to be metallic.
  • the individual struts 22 are preferably not connected to another strut 22 (in the circumferential direction) or in any other way, and no cage is then formed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Superconductive Dynamoelectric Machines (AREA)

Abstract

L'invention concerne une pompe pour un liquide cryogénique dans une conduite de transport (7), la pompe comprenant un moteur électrique, le moteur électrique comprenant : un stator de moteur (9) en tant que partie de la conduite de transport ou autour de la conduite de transport ; un rotor (1) à l'intérieur du tuyau de transport et du stator de moteur, le rotor comprenant un rotor de moteur (3) et au moins un élément de transport mécanique de fluide (4) pour convertir une rotation du rotor en un écoulement de fluide dans le tuyau de transport ; et un agencement de palier rotatif (2, 8) pour le rotor ; le rotor de moteur (3) comprenant un rotor à cage d'écureuil constitué d'un supraconducteur à haute température (HTS), et le stator de moteur (9) pouvant fonctionner avec un champ électromagnétique alternatif.
PCT/EP2024/066166 2023-06-15 2024-06-12 Pompe pour liquide cryogénique Ceased WO2024256434A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023115683.7 2023-06-15
DE102023115683.7A DE102023115683A1 (de) 2023-06-15 2023-06-15 Pumpe

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WO2024256434A1 true WO2024256434A1 (fr) 2024-12-19

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WO (1) WO2024256434A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653448A1 (de) 1967-03-24 1971-11-11 Gen Electric Pumpe fuer fluessiges Helium
JPS53115902A (en) * 1977-03-19 1978-10-09 Toshiba Corp Verylow temperature fluid pump
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