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
  • F04D25/00—Pumping installations or systems
  • F04D25/02—Units comprising pumps and their driving means
  • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
  • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
• • 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
  • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
  • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
  • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
  • F04D25/062—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
  • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
  • F04D17/08—Centrifugal pumps
  • F04D17/16—Centrifugal pumps for displacing without appreciable compression
• • 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
  • F04D29/0462—Bearing cartridges
• • 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
  • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
  • F04D29/053—Shafts
• • 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
  • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
  • F04D29/056—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
  • F04D29/00—Details, component parts, or accessories
  • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
  • F04D29/056—Bearings
  • F04D29/0563—Bearings cartridges
• • 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
  • F04D29/083—Sealings especially adapted for elastic fluid 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
  • F04D29/00—Details, component parts, or accessories
  • F04D29/08—Sealings
  • F04D29/16—Sealings between pressure and suction sides
  • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
  • F04D29/162—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of a centrifugal flow wheel
• • 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
  • F04D29/26—Rotors specially for elastic fluids
  • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
  • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
• • 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
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
  • F04D29/4226—Fan casings
• • 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
  • F04D29/18—Rotors
  • F04D29/22—Rotors specially for centrifugal pumps
  • F04D29/2261—Rotors specially for centrifugal pumps with special measures
  • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
• • 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
  • F05D2210/00—Working fluids
  • F05D2210/10—Kind or type
  • F05D2210/12—Kind or type gaseous, i.e. compressible

Definitions

• the invention relates to a rotor assembly with a fan wheel and a radial fan with such a rotor assembly.
• This design includes many components and requires a comparatively large amount of space due to the magnetic coupling. At the high speeds of a radial fan, a compact unit with a high power density with a separate magnetic coupling cannot therefore be sensibly implemented.
• High-speed applications in the sense of the present invention are speeds of the fan wheel at which the peripheral speed at the radial compressor outlet is at least 60 m / s.
• the classic structure requires a separation of the bearing seats. A precise alignment of the bearings and bearing seats can only be guaranteed with great effort.
• the balancing of such a unit must be done in two steps due to the double-sided mounting. First the anchor must be balanced in a first step, then the complete unit must be balanced because the anchor is inaccessible.
• the invention is therefore based on the object to overcome the aforementioned disadvantages and to provide a rotor assembly of a radial fan, in particular a high-speed radial fan, which offers an optimized mounting option and at the same time a seal can be created between the rotor and the stator at the same time good efficiency.
• a rotor assembly for a high-speed radial fan comprising a bearing tube which is axially open on the inside and in which a shaft carrying a fan wheel and a rotor is mounted, the rotor of the rotor assembly being mounted in a cylindrical containment shell of a housing.
• Another aspect of the invention relates to a radial fan with a
• Fan housing which is formed in one piece with the containment shell and accordingly the rotor assembly is accommodated in the containment shell of the fan housing.
• the bearing tube with the shaft and the rotor mounted on the shaft is arranged in the circumferentially closed containment shell.
• a construction in which the containment shell extends in the axial direction away from a substantially flat housing base plate of the fan housing. It is also advantageous if an air gap is formed between the rotor and a stator surrounding the rotor (50) and the containment shell with its cylindrical can walls is arranged in the air gap. In this way, the fan shaft can be driven directly without the need for a magnetic coupling.
• the material of the containment shell is not a good electrical conductor since this leads to eddy current losses due to the rotating magnet.
• the volume resistance of the containment shell material should not fall below 10 ohms.
• a magnetic permeability of the containment shell material close to 1 is preferred, since otherwise parts of the magnetic field will be crimped off.
• the shaft is mounted centrally in a region between the fan wheel and the rotor on a first bearing arranged in the bearing tube and a second bearing arranged axially at a distance in the bearing tube.
• the topology of the engine is designed for high speeds.
• the rotor has the minimum number of pole pairs of 1 or 2 poles. This makes it possible to accept a large magnetic air gap without having to accept excessive efficiency losses.
• the containment can, which separates the rotor area from the stator area, can be placed in this magnetic air gap.
• the rotor of the motor has exactly 2 or 4 poles.
• the stator is surrounded by a housing which provides a receiving space for the stator and preferably motor electronics installed in the receiving space, the housing being sealed off from and connected to the fan housing.
• the bearing tube is supported with a radial projection on a housing base plate of the fan housing and is with the
• Fan housing connected by means of a connection arrangement, wherein the projection extends at least partially over the outer circumference of the fan wheel.
• the design concept can be further adapted to different working points using various scaling options.
• scaling options are e.g. B. the fan diameter, the fan speed, the fan shape, the fan blade height, the cross section of the volute casing, the diameter of the connecting piece, the size of the ball bearing, the active length of the motor, the diameter of the stator, the diameter of the magnet, the size of the air gap, the structure of the circuit board, the winding configuration and the shaft diameter.
• FIG. 1 shows a sectional view through an exemplary embodiment of a rotor assembly.
• FIG. 2 is a sectional view through an embodiment of a radial fan
• Fig. 3 is a perspective sectional view through the embodiment of Figure 2 and
• FIGS. 2 and 3 show an exemplary embodiment of a flute speed radial fan 1 with a rotor assembly 10.
• the rotor assembly 10 comprises a bearing tube 20 which is axially open on the inside. Pipe 20, a shaft 40 is mounted, with a rotor 50 of a split pot motor being mounted on the shaft 40. An air gap is formed between the rotor 50 and a stator 51 surrounding the rotor 50 and the containment shell is arranged in the air gap with its cylindrical containment wall 3a.
• the stator 51 of the motor which is external in this respect, is in turn arranged in a housing 52.
• the rotor 50 has exactly 2 poles.
• the housing 52 forms a receiving space for the stator 51 and the motor electronics 55, the housing 52 being sealed off from the fan housing 2 and sealing surfaces 56 and connected to it.
• the bearing tube 20 has an outwardly projecting radial projection 21.
• the projection 21 extends over the outer circumference 31 of the fan wheel 30.
• the projection 21 is essentially designed as a round plate-shaped projection, the diameter of which is larger than the diameter of the fan wheel 30.
• the projection 21 also has an outer circumferential upwardly projecting collar 23 which extends in the axial direction A and radially surrounds the radial edge region 32 of the fan wheel 30.
• the fan wheel 30 is placed on the shaft 40 such that the fan wheel 30 is arranged in the depression in the projection 21.
• the shaft 40 is mounted between two bearings 24, 25, a spring 28 being biased against the first bearing 24, which is supported on an inner flange web 29.
• the second (lower bearing 25 in FIG. 1) sits at the lower end of the bearing tube 20 and is supported against the collar web 29.
• the shaft 40 with the rotor 50 projects through the lower bearing 25.
• the fan housing 2 is also shown in FIGS. 1 and 2.
• the bearing tube 20 projects with the shaft 40 and the rotor 50 mounted on the shaft 40 into a circumferentially closed (open-top) containment shell 3, which is part of the fan housing 2 of the radial fan 1 and is formed in one piece therewith.
• the containment shell 3 of the housing 2 extends in the axial direction from a substantially flat housing bottom plate 2a of the fan housing 2.
• the bearing tube 20 is supported with its radial projection 21 on the housing base plate 2a and is connected to the fan housing 2 by means of a screw connection.
• FIGS. 4 to 8 show further embodiments of the invention, in particular the design of the housing 2, the containment shell 3, the bearing tube 20 and the design of the heat dissipation section 23 in an alternative form.
• the projection of the containment shell 3v can also be seen, which extends between an upper housing part and lower housing part of the housing 2.
• FIG. 9 also shows that a fastening opening is provided in the region of the heat dissipation section 23 in order to fasten the projection of the bearing tube 20 to the projection of the can 3.
• the embodiment of the invention is not limited to the preferred exemplary embodiments given above. Rather, a number of variants are conceivable which make use of the solution shown, even in the case of fundamentally different types.
• the design could be adapted to the application in accordance with application-specific scaling options, as explained in more detail above.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=68342909

Family Applications (1)

Country Status (6)

Citations (3)

Family Cites Families (16)

• 2018
  • 2018-11-23 DE DE102018129612.6A patent/DE102018129612A1/de not_active Withdrawn
• 2019
  • 2019-01-03 CN CN201920005677.2U patent/CN209724779U/zh active Active
  • 2019-10-21 EP EP19794120.6A patent/EP3853482A1/de active Pending
  • 2019-10-21 US US17/292,347 patent/US11808273B2/en active Active
  • 2019-10-21 KR KR1020217013660A patent/KR20210094526A/ko not_active Application Discontinuation
  • 2019-10-21 CN CN201980074537.3A patent/CN113015855A/zh active Pending
  • 2019-10-21 WO PCT/EP2019/078558 patent/WO2020104127A1/de unknown

Patent Citations (3)

Non-Patent Citations (1)

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