EP4130482A1 - Groupe moto-ventilateur - Google Patents

Groupe moto-ventilateur Download PDF

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Publication number
EP4130482A1
EP4130482A1 EP22188355.6A EP22188355A EP4130482A1 EP 4130482 A1 EP4130482 A1 EP 4130482A1 EP 22188355 A EP22188355 A EP 22188355A EP 4130482 A1 EP4130482 A1 EP 4130482A1
Authority
EP
European Patent Office
Prior art keywords
wall
hub
motor
connection
keys
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.)
Pending
Application number
EP22188355.6A
Other languages
German (de)
English (en)
Inventor
Stefano Torregiani
Giuseppe Bruni
Martina BOLOGNINI
Marco BISCHI
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.)
Emc Fime SRL
Original Assignee
Emc Fime SRL
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 Emc Fime SRL filed Critical Emc Fime SRL
Publication of EP4130482A1 publication Critical patent/EP4130482A1/fr
Pending 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
    • 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
    • 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans

Definitions

  • the present invention relates to a motor-fan assembly, in particular for heat pumps, according to the preamble of claim 1.
  • heat pumps are used for both cooling and heating in the industrial and domestic fields, for example, for the air conditioning and ventilation of environments, for heating and/or cooling substances, materials, fluid flows, etc.
  • an adiabatic fluid is compressed on the one side, thus heating up and generating heat, and on the other side, the previously compressed adiabatic fluid is expanded and evaporated, thus cooling and generating cold.
  • the use of electric fans generating an air flow which brushes, for example, a heat exchanger associated with the compressor and/or evaporator of the heat pump is known.
  • the electric fans of the prior art comprise an electric motor with a stator being connectable to the specific utility, in particular to the heat pump, and with a rotor having a peripheral wall to which a fan impeller, usually made of polymer material, is connected.
  • the connection between the impeller and the rotor of the electric motor is achieved by an interference coupling between an annular hub wall of the impeller and the peripheral wall of the rotor of the motor.
  • the impeller is axially inserted and fitted onto the peripheral wall of the rotor.
  • the motor-fan assemblies for heat pumps of the prior art have some disadvantages which have not been overcome to date.
  • the connection between the motor and the impeller by interference insertion does not ensure the reliable and repeatable relative positioning thereof, in particular the impeller cannot be perfectly concentric with the rotation axis of the motor.
  • manufacturing the impeller of two different materials involves undesirably high material and manufacturing costs.
  • a motor-fan assembly in particular for a heat pump, comprises:
  • the impeller is coupled to the rotor of the motor with a concentric, reliable and repeatable relative positioning, being suitable for automated industrial assembly and such as to obviate the need to integrate a metal ring into the impeller.
  • connection and hub walls thus configured, both the impeller and the connection wall of the motor can be easily made of polymer material by injection molding.
  • a motor-fan assembly 1 in particular for a heat pump, comprises:
  • the impeller 7 is coupled to the rotor 4 of the motor 2 with a concentric, reliable and repeatable relative positioning, being suitable for automated industrial assembly and such as to obviate the need to integrate a metal ring into the impeller.
  • connection 5 and hub 8 walls thus configured, both the impeller 7 and the connection wall 5 of the electric motor 2 can be easily made of polymer material by injection molding.
  • the key or keys 10 have a flattened, substantially plate-like shape with two first opposite longitudinal edges 19, extending substantially parallel to the rotation axis 6 or substantially in the insertion direction 12, preferably but not necessarily parallel to one another, and forming the aforesaid first side surfaces 15, as well as with at least a first transverse edge 20 extending in a direction transverse to the insertion direction 12 and forming the aforesaid first stop surface 13.
  • the first longitudinal edges 19 can substantially be rectilinear and the first transverse edge 20 can have a rectilinear shape or a curved extension along a circumference with respect to the rotation axis 6.
  • the first transverse edge 20 connects the first longitudinal edges 19 to one another and, along with the first longitudinal edges 19, results in a U-shaped outer contour of the key 10 ( Figure 5 ).
  • This shape of the key 10 eases a manufacturing thereof by injection molding and facilitates a guided insertion of the key 10 into the key seat 11 in the direction of the rotation axis 6.
  • the keys 10 are formed directly from the hub wall 8 of the impeller 7 and protrude radially inwards ( Figures 3, 4, 5 , 9, 10 ).
  • the keys 10 can be made separately from the impeller 7 and then connected to the hub wall 8.
  • the first transverse edge 20 and the first stop surface 13 formed thereon face the insertion direction 12.
  • a radial thickness 22 of the keys 10 protruding from the hub wall 8 is thinner than the radial thickness 23 of the connection wall 5 at the key seats 11, so that the keys 10 can be inserted into the key seats 11 without radially passing through the connection wall 5 ( Figures 9, 10 ).
  • the hub wall 8 is preferably formed by a plurality of segments or flaps 21 of a substantially circular cylindrical wall, alternated and spaced apart from one another by gaps or first widening slits 29, and the keys 10 are preferably positioned at a constant angular pitch, for example, four keys 10 are arranged at a 90° pitch, preferably a key 10 positioned at one of the segments or flaps 21 of the substantially circular cylindrical wall, respectively.
  • the first widening slits 29 weaken or interrupt the hub wall 8 to allow an elastic widening thereof in the circumferential and/or radial direction with respect to the rotation axis 6.
  • the first widening slits 29 can preferably extend in an axial direction, in regions spaced apart from the keys 10 and from the key seats 11, for example, substantially halfway between two consecutive keys 10, respectively.
  • the keys 10 can be arranged flush with a rear edge 24 of the hub wall 8 opposite to the transverse edge 20 of the keys 10 ( Figures 4, 5 ).
  • the hub wall 8 can form a tubular lead-in portion 28 ( Figure 9 ) which widens radially, preferably by means of a gradual continuous curvature, on one side of the impeller 7 facing the insertion direction 12 or, in other words, on the same side as the first transverse edges 20 of the keys 10.
  • This lead-in (or flaring) portion 28 of the hub wall 8 forms a lead-in for a guided insertion of the hub wall 8 onto the connection wall 5 of the rotor 1.
  • the keys 10 have a plate-like shape with a thickness (measured in the radial direction with respect to the rotation axis 6) tapered in the insertion direction 12 ( Figure 9 ), thus facilitating the insertion of the hub wall 8 of the impeller 7 onto the connection wall 5 of the rotor 1.
  • the key seats 11 can be non-through cavities or through openings (in the radial direction) delimited by two second opposite longitudinal edges 25, extending substantially parallel to the rotation axis 6 or substantially in the insertion direction 12, preferably but not necessarily parallel to one another, and which form the aforesaid second side surfaces 16, as well as with at least a second transverse edge 26 extending in a direction transverse to the insertion direction 12 and forming the aforesaid second stop surface 14.
  • the second longitudinal edges 25, and therefore the second side surfaces 16 of the key seat 10 approach each other going towards the second transverse edge 26 or extend along parallel directions with respect to the rotation axis 6.
  • the second longitudinal edges 25 can substantially be rectilinear and the second transverse edge 26 can be planar and arc-shaped along a circumference with respect to the rotation axis 6.
  • the second transverse edge 26 connects to the second longitudinal edges 25 and, along with the second longitudinal edges 25, results in a U-shaped inner contour of the key seat 11 ( Figures 4, 5 ), which is substantially complementary to the shape of the U-shaped outer contour of the key 10.
  • This shape of the key seat 11 can be easily achieved by injection molding and facilitates the insertion of the key 10 into the key seat 11 in the direction of the rotation axis 6.
  • the key seats 11 are formed by the connection wall 5 of the rotor 4 ( Figures 3, 4 , 9 ).
  • the second transverse edge 26 and the second stop surface 14 formed thereon are positioned on one side of the key seat 11 opposite to the insertion direction 12 but facing the insertion direction 12.
  • the key seats 11 can be formed in a portion of the connection wall 5 which is preferably circular cylindrical.
  • the key seats 11 can be positioned at a constant angular pitch, for example four key seats 11 arranged at a 90° pitch.
  • the coupling portions 17 comprise a plurality of flanges 31 protruding from the hub wall 8 radially inwards, so as to snap-engage corresponding counter-flanges 30 of the connection wall 5 which form the counter-coupling portions 18 ( Figure 9 ).
  • the flanges 31 are formed directly on the keys 10 on an opposite side to the first transverse edge 20 of the first stop surface 13, and facing in the opposite direction to the insertion direction 12.
  • the counter-flanges 30 are instead formed directly in the key seats 11 on an opposite side to the second transverse edge 26 or the second stop surface 14, and facing the insertion direction 12.
  • connection wall 5 and the hub wall 8 are mutually engaged in pressing contact with an elastic preload due to an elastic deformation of the hub wall 8.
  • the impeller 7 forms a plurality of main blades 27 arranged in a circumferential sequence and alternated to secondary blades (splits) 27' of a shorter length than the length of the main blades 27 ( Figures 7 , 11 ).
  • the length of the main blades 27 is equal to or greater than twice the length of the secondary blades (splits) 27'.
  • Both the main blades 27 and the secondary blades (splits) 27' extend up to the same outer diameter (or circumference) 32 of the impeller 7, but a radially inner end of the primary blades 27 is positioned at a first radial distance 33 from the rotation axis 6 while a radially inner end of the secondary blades 27' is positioned at a second radial distance 34 from the rotation axis 6 which is greater than the first radial distance 33.
  • the secondary blades (splits) 27' are not equally spaced apart from the two adjacent primary blades 27 ( Figure 11 ). With respect to a central, equally spaced apart position 35, the secondary blade 27' is offset or moved towards the adjacent frontal main blade 36 with reference to the rotation direction 37 ( Figure 11 ).
  • the invention also relates to a heat pump (not shown in the Figures since it is known per se) comprising the motor-fan assembly 1, in particular associated with a heat exchanger of a compressor and/or evaporator of the heat pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cookers (AREA)
  • Food-Manufacturing Devices (AREA)
  • Control Of Multiple Motors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP22188355.6A 2021-08-06 2022-08-02 Groupe moto-ventilateur Pending EP4130482A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202021000004088U IT202100004088U1 (it) 2021-08-06 2021-08-06 Gruppo motore-ventilatore

Publications (1)

Publication Number Publication Date
EP4130482A1 true EP4130482A1 (fr) 2023-02-08

Family

ID=83319177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22188355.6A Pending EP4130482A1 (fr) 2021-08-06 2022-08-02 Groupe moto-ventilateur

Country Status (2)

Country Link
EP (1) EP4130482A1 (fr)
IT (1) IT202100004088U1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19829070A1 (de) * 1998-06-30 2000-01-05 Atlas Copco Electric Tools Rotationsmaschine
US20150125326A1 (en) * 2012-03-22 2015-05-07 Valeo Systemes Thermiques Ventilation System
US20150176587A1 (en) * 2013-12-20 2015-06-25 Nidec Corporation Fan
CN205744589U (zh) * 2016-05-06 2016-11-30 宁波方太厨具有限公司 一种快速拆装的离心风机叶轮

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19829070A1 (de) * 1998-06-30 2000-01-05 Atlas Copco Electric Tools Rotationsmaschine
US20150125326A1 (en) * 2012-03-22 2015-05-07 Valeo Systemes Thermiques Ventilation System
US20150176587A1 (en) * 2013-12-20 2015-06-25 Nidec Corporation Fan
CN205744589U (zh) * 2016-05-06 2016-11-30 宁波方太厨具有限公司 一种快速拆装的离心风机叶轮

Also Published As

Publication number Publication date
IT202100004088U1 (it) 2023-02-06

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