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
  • F04D13/12—Combinations of two or more pumps
  • F04D13/14—Combinations of two or more pumps the pumps being all of centrifugal type
• • 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
  • F04D13/026—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
  • F04D13/021—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
  • F04D13/027—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
  • F04D25/00—Pumping installations or systems
  • F04D25/02—Units comprising pumps and their driving means
  • F04D25/026—Units comprising pumps and their driving means with a magnetic coupling
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D25/00—Pumping installations or systems
  • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
• • 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
  • F04D29/58—Cooling; Heating; Diminishing heat transfer
  • F04D29/5806—Cooling the drive system

Definitions

• the invention relates to an arrangement for conveying fluids. As fluids liquid and / or gaseous media can be promoted.
• the dissipation of heat from these components takes place by means of so-called heat receivers or CoId plates.
• the heat is transferred to a cooling liquid, which is usually placed in forced circulation in a liquid circuit.
• the cooling liquid flows through not only the heat absorber, but also a liquid pump, which causes the forced circulation and causes an adequate pressure build-up and an adequate volume flow through the heat absorber and an associated liquid-air heat exchanger.
• the liquid-to-air heat exchanger serves to release the heat from the cooling liquid to the ambient air.
• a fan is usually arranged in the liquid-air heat exchanger, which causes a forced convection of the cooling air and good transfer coefficients on the air side of the heat exchanger.
• an arrangement according to the invention for conveying fluids comprises an electronically commutated external rotor motor with a stator arranged on a stator carrier and a rotor mounted in a bearing tube, and a fluid pump with a delivery wheel.
• the rotor of the electronically commutated external rotor motor and the delivery wheel of the fluid pump are magnetically coupled to each other via a magnetic coupling such that rotation of the rotor causes rotation of the delivery wheel.
• This magnetic coupling is formed by a first permanent magnet connected to the rotor in cooperation with a second permanent magnet connected to the impeller.
• at least the first permanent magnet is disposed in a space between the stator and the bearing tube and separated from the second permanent magnet by a liquid-tight but magnetically transparent partition.
• the second permanent magnet can also be arranged in the intermediate space between the stator and the bearing tube. This allows a further reduction in the height and an increase in the integrity of the unit external rotor motor, magnetic coupling and fluid pump.
• a further preferred embodiment of the arrangement according to the invention is the subject of claim 10. Accordingly, the bearing tube, the partition and the stator can be formed as a one-piece, meandering in cross-section part. This allows a minimization of the number of parts and thus a simplified assembly of the arrangement.
• FIG. 1 shows a longitudinal section through a first preferred embodiment of an arrangement for conveying fluids according to the invention
• FIG. 1 is an exploded view of the arrangement of FIG. 1
• 3 is a sectional view of a three-dimensional view of a second preferred embodiment of an arrangement for conveying fluids according to the invention
• Fig. 4 is a longitudinal section through the arrangement of FIG. 3, and
• FIG. 5 is an exploded view of the arrangement of FIG .. 3
• the terms left, right, up and down refer to the respective drawing figure, and may vary from one drawing figure to the next, depending on a particular orientation (portrait or landscape). Identical or equivalent parts are denoted by the same reference numerals in the various figures and usually described only once.
• FIG. 1 shows an enlarged sectional view of a first embodiment of an arrangement with a fluid pump 84, which is exemplified as a centrifugal pump, and an electronically commutated external rotor motor 20.
• a fluid pump 84 which is exemplified as a centrifugal pump
• an electronically commutated external rotor motor 20 This has an internal stator 22 of conventional design, as shown by way of example in Fig. 2, eg a stator with salient poles or a claw-pole stator, and this is separated from a permanent-magnetic outer rotor 26 by a substantially cylindrical air gap 24.
• the outer rotor 26 rotates about the inner stator 22, which is why such motors 20 are referred to as external rotor motors.
• the inner stator 22 is mounted on an annular stator support 34, usually by pressing.
• the shape of the stator carrier 34 is particularly clear from FIG.
• a circuit board 32 On this are, for example. (not shown here) electronic components, which are required for electronic commutation of the motor 20.
• a rotor position sensor 38 is disposed on the circuit board 32, which is controlled by the rotor magnet 36 of the outer rotor 26.
• This rotor magnet 36 is designed as a permanent magnet ring and preferably has plastic-bonded magnetic material.
• the rotor magnet 36 is radially magnetized and preferably formed eight-pole. Its magnetization, that is, the distribution of its magnetic flux density, may be e.g. be rectangular or trapezoidal.
• the rotor position sensor 38 is controlled by a stray field of the rotor magnet 36, which allows a non-contact detection of the position of the outer rotor 26.
• the outer rotor 26 has a construction with a so-called rotor bell 40, which is shown in Fig. 1 by way of example as a deep-drawn, cup-shaped sheet metal part and, for example a soft ferromagnetic material is formed.
• the rotor magnet 36 is fixed in this rotor bell 40, so that the latter forms a magnetic return for the rotor magnet 36.
• fan blades 64 are exemplified.
• the rotor bell 40 is preferably surrounded by a plastic part (not shown), cf. Fig. 5, on which these fan blades 64 are formed by plastic injection molding in the manner shown.
• the fan blades 64 rotate during operation in a recess of a fan housing. A corresponding fan housing will be explained below with reference to FIG.
• a shaft 46 is fixed in the manner shown.
• the shaft 46 is mounted in two ball bearings 48, 50, which are e.g. be pressed together with the shaft 46 from above into a bearing tube 30 during assembly in Fig. 1.
• the ball bearings 48, 50 can be held in the bearing tube by suitable retaining elements, e.g. a locking member.
• the shaft 46 can also be held by suitable holding elements, e.g. through a snap ring.
• a gap is formed in which a so-called drive magnet 67 is arranged.
• This drive magnet 67 serves as a drive in a magnetic coupling and is annular in Fig. 1 and 2 and fixedly connected to the rotor bell 40.
• the drive magnet 67 comprises plastic-bonded magnetic material, eg plastic material with embedded particles of hard ferrite, and is produced by plastic injection molding.
• a permanent magnet produced is also referred to as a plastic-bonded ferrite magnet and can also be used to form the rotor magnet 36.
• the rotor magnet 36 can be fixed by the plastic injection on the rotor bell 40.
• a rotor magnet 36 and a hard ferrite magnet ring be attached separately to the rotor bell 40, for example by gluing or pressing, or you could use individual magnets made of rare earth, such as neodymium.
• the drive magnet 67 is separated by an annular partition 82 of a so-called driving magnet 92 which is "taken along" during operation of the magnetic coupling upon rotation of the drive magnet 67 and arranged in cross-section parallel to the drive magnet 67.
• This partition 82 is preferably liquid-tight but magnetically transparent, e.g. made of plastic.
• the upper end of the annular dividing wall 82 is liquid-tightly connected to the upper end of the bearing tube 30 via an annular ridge 80.
• the lower end of the partition 82 is liquid-tightly connected to the lower end of the annular stator carrier 34 via an annular ridge 74.
• the annular webs 80 and 74 each extend perpendicular to the axis of rotation of the outer rotor 26.
• the bearing tube 30, the web 80, the partition 82, the web 74 and the stator 82 a meandering in cross-section part, which in the region of the driving magnet 92 as a gap pot is trained.
• This containment shell is integrally formed according to a preferred embodiment and e.g. made of plastic.
• the containment shell passes over the outer periphery of the annular ridge 74 into a cylindrical portion 94 which, as shown, serves to secure a lid 88 to form a liquid-tight pump housing 86 therewith.
• the lid 88 may e.g. by means of a (not shown) screw fastening, a (not shown) sealing ring, or by laser welding to the cylindrical portion 94 are attached.
• an inlet 96 is provided, via which a fluid can pass into the pump housing 86, which can emerge from the pump housing 86 via a schematically illustrated outlet 98.
• a delivery wheel 90 is provided to form the fluid pump 84.
• the feed wheel 90 is disposed on a pump shaft 106 which is formed in axial extension to the shaft 46 of the outer rotor 26. Both waves are liquid-tight separated from each other by the liquid-tight end 60 of the inner recess of the bearing tube 30.
• the pump shaft 106 forms a fixed axis on which the feed wheel 90 is rotatably mounted in Fig. 1 in a circular bearing 108 relative to the axis.
• the rotary bearing 108 is preferably realized by so-called hybrid bearings. These hybrid bearings have ceramic balls and bearings made of a corrosion-resistant stainless steel alloy. They are manufactured eg by the company GRW and are especially for blood pumps and Dental drill used. With such bearings you get the desired lifetimes even in unusual fluids.
• the support wheel 90 a rotating shaft, which, like the shaft 46 of the outer rotor 26, is mounted in a bearing tube (not shown), which, like the bearing tube 30, is then formed integrally with the containment shell and protrudes from this down, so mirror image of the bearing tube 30th
• the feed wheel 90 is preferably formed integrally with the driving magnet 92 which, by cooperation with the driving magnet 67, forms the magnetic coupling, i. when the drive magnet 67 rotates, the driving magnet 92 also rotates, thereby driving the delivery wheel 90, whereby it draws a fluid through the inlet 96 and pumped out again via the outlet 98, as indicated by arrows.
• fluids liquid media, e.g. Coolants, and / or gaseous media find application.
• any other turbomachine may be provided, e.g. a compressor for a refrigerant.
• the magnetic coupling is formed by a coupling of the radial magnetic fields of the drive magnet 67 and the driving magnet 92. Therefore, this magnetic coupling is hereinafter referred to for clarity as a radial magnetic coupling.
• Fig. 2 shows an exploded view of the arrangement of Fig. 1, in which the lid 88 of the pump housing 86 is not shown. From Fig. 2, in particular, the one-piece, meander in cross-section design of the bearing tube 30, the web 80, the partition 82, the web 74 and the stator 34 is clearly visible. Furthermore, the design of the inner stator 22 and the one-piece design of the feed wheel 90 with the driving magnet 92 are illustrated in FIG.
• FIG. 3 shows, in an enlarged, three-dimensional sectional view, a second embodiment of the arrangement for conveying fluids with the fluid pump 84 and the electronically commutated external-rotor motor 20, which differs slightly from FIG.
• This arrangement is exemplarily mounted in a recess 66 of a fan housing 68, in which the fan blades 64 of the electronically commutated external rotor motor 20 rotate during operation, cf. Fig. 4 and 5.
• the fan housing 68 has, for example, the usual square shape of a device fan and has in its corners each have a mounting hole 70th
• the rotor bell 40 is surrounded, as shown, by a plastic part 63, on which the fan blades 64 are formed by plastic injection molding in the manner shown.
• the partition wall 82 is not disposed between the bearing tube 30 and the stator support 34, but at the lower ends thereof.
• the driving magnet 92 is not arranged in cross-section parallel to the drive magnet 67, but rather in axial extension to this.
• the partition wall 82 in the second embodiment forms an annular ridge between the lower end of the bearing tube 30 and the lower end of Statorambas 34, which are liquid-tightly connected to each other by the partition wall 82 and in the region of the driving magnet 92 form a split pot.
• This containment shell is preferably integral and e.g. made of plastic, and passes over the outer periphery of the annular partition wall 82 in the cylindrical portion 94, which in turn serves to attach the lid 88.
• the cylindrical section 94 is shown in FIG. 3 by way of example in streamlined form as a streamlined channel.
• the magnetic coupling is formed by a coupling of the axial magnetic fields of these permanent magnets. Therefore, this magnetic coupling is hereinafter referred to for clarity as axial magnetic coupling.
• a permanent magnet with a strong axial magnetic field is preferably used for the entrainment magnet 92, e.g. a rare earth magnet.
• Fig. 4 shows a longitudinal section through the arrangement of Fig. 3, in which the formation of the outer rotor 26 with the rotor bell 40 and the rotor magnet 36 is clearly visible.
• FIG. 5 shows an exploded view of the arrangement from FIG. 5, in which, in particular, the one-piece construction of the containment shell and the aerodynamic configuration of the cylindrical portion 94 can be seen.
• the external rotor motor 20 with the outer rotor 26 forms a fan whose fan blades 64 rotate in the fan housing 68.
• this fan is shown by way of example as an axial fan, which upon rotation of the fan blades 64 in FIG known manner generates an axial flow of air.
• the fan can be designed, for example, as a diagonal fan or radial fan. The fan design used depends on the particular requirements.
• the drive magnet 67 Upon rotation of the outer rotor 26, the drive magnet 67 is also rotated, which is e.g. can be magnetized six- or eight-pole.
• the drive magnet 67 drives the driving magnet 92, which is also magnetized in this case six- or eight-pole, and takes this in the rotation with. If the drive magnet 67 rotates, e.g. counterclockwise, the magnetic coupling consequently also rotates the driving magnet 92 at the same speed in the counterclockwise direction.
• the arrangement shown in FIGS. 1 to 5 thus operates on the principle of a synchronous motor. Alternatively, operation with slippage is possible.
• the driving magnet 92 and the feed wheel 90 By the forced rotation of the driving magnet 92 and the feed wheel 90 is rotated so that it sucks a corresponding fluid through the inlet 96 and pumped through the outlet 98 back to the outside.
• Such an arrangement may e.g. be used to aspirate and pump out in a fountain, or to pump blood in a heart-lung machine, or to transport a cooling liquid in a closed cooling circuit, the feed wheel 90 then has the function of a circulation pump.
• the lid 88 Since the lid 88 is liquid tightly connected to the cylindrical portion 94, e.g. by laser welding, it can not escape from the pump housing 86 when conveying a liquid to the outside. This contributes to that the section 94 is free of openings of any kind.
• the electronically commutated external rotor motor 20 and the fluid pump 84 according to the invention can be mounted independently of each other and in a very simple and reliable manner, see. Figs. 2 and 5. For example. it is not necessary during the assembly of the electronically commutated external rotor motor 20 to have access to the end 60 of the inner recess of the bearing tube 30, or on that side of the split pot, on which the fluid pump 84 is formed.
• the entire remaining part of the arrangement can be completely assembled.
• the delivery wheel 90 of the fluid pump 84 with its rotary bearing 108 can be mounted from below on the stationary pump shaft 106 before the cover 88 is fastened.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Thermotherapy And Cooling Therapy Devices (AREA)
• Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Applications Claiming Priority (2)

Publications (2)

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• 2005
  • 2005-09-02 DE DE502005005904T patent/DE502005005904D1/de active Active
  • 2005-09-02 EP EP05778381A patent/EP1778981B1/fr not_active Not-in-force
  • 2005-09-02 ES ES05778381T patent/ES2315908T3/es active Active
  • 2005-09-02 AT AT05778381T patent/ATE413532T1/de not_active IP Right Cessation
  • 2005-09-02 US US11/576,881 patent/US7780422B2/en not_active Expired - Fee Related
  • 2005-09-02 WO PCT/EP2005/009443 patent/WO2006039965A1/fr active Application Filing

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