EP4001664B1 - Blower and household appliance - Google Patents

Blower and household appliance Download PDF

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Publication number
EP4001664B1
EP4001664B1 EP21206211.1A EP21206211A EP4001664B1 EP 4001664 B1 EP4001664 B1 EP 4001664B1 EP 21206211 A EP21206211 A EP 21206211A EP 4001664 B1 EP4001664 B1 EP 4001664B1
Authority
EP
European Patent Office
Prior art keywords
hole
blower
rotation direction
connecting disc
motor
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.)
Active
Application number
EP21206211.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP4001664A1 (en
Inventor
Youquan Tian
Guojie Li
Jian Kong
Qinglai Wang
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
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 BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP4001664A1 publication Critical patent/EP4001664A1/en
Application granted granted Critical
Publication of EP4001664B1 publication Critical patent/EP4001664B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • 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
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • 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
    • F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on 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
    • F04D29/26—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
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement or mounting of control or safety systems

Definitions

  • the present invention relates to the field of household appliance technologies, and in particular, to a blower and a household appliance.
  • a blower is a core component of household appliances, especially a range hood, and a structure of the blower directly affects performance and use experience of the range hood. Therefore, design of a relevant structure in the blower is particularly important.
  • the blower mainly includes a housing and an impeller assembly and a motor disposed in the housing, and the motor drives the rotation of the impeller assembly through a motor shaft.
  • the impeller and the motor are usually connected by a clearance fit between the motor shaft and a hole on the impeller, then positioned by a pin through the motor shaft and the impeller, and finally locked with a reverse nut at an end portion of the motor shaft.
  • a pin press-fit positioning manner is also relatively complex, and there is also a problem that an impeller assembly angle cannot be confirmed during reassembly after disassembly.
  • this connection manner cannot achieve two-way anti-loosening.
  • Document JP 2003 028093 A shows a straightening member mounting structure of an impeller. After the straightening member is fixedly screwed into a rotating shaft, a rotation preventing bolt is inserted, through a tongued washer, into a hole provided in the straightening member. The rotation preventing bolt is screwed into a screw hole provided at the end part of the rotating shaft. One end of the tongued washer as a locking member is bent toward a plane formed at the top part of the straightening member, and the other end is bent toward the head part side face of the rotation preventing bolt.
  • Document CN 111 102 240 A shows an impeller locking structure with a self-locking effect and a centrifugal compressor.
  • the impeller locking structure comprises a rotating shaft and two impellers arranged at the two ends of the rotating shaft. Each impeller is locked to the rotating shaft through a locking nut and an additional locking nut.
  • the turning directions of threads of the locking nuts are opposite. According to the impeller locking structure with the self-locking effect and the centrifugal compressor, the turning directions of the threads of the locking nuts are opposite, the locking direction of the locked impellers is the same as the rotating direction of the rotating shaft.
  • Document CN 211 296 450 U shows a motor reverse rotation anti-loosening connecting structure comprising a nut, a first ratchet disc, a second ratchet disc and a spring.
  • the first ratchet disc is positioned and sleeved on the motor shaft; the first ratchet disc is provided with first ratchets, the second ratchet disc is arranged between the nut and the first ratchet disc, the second ratchet disc and the nut rotate synchronously, the second ratchet disc is provided with second ratchets, one end of the spring abuts against the nut, and the other end of the spring abuts against the second ratchet disc so that the second ratchets on the second ratchet disc can be meshed with the first ratchets on the first ratchet disc.
  • Document DE 203 17 573 U1 shows a hub for the fastening of a rotating component, especially a fan impeller, on a shaft, whereby the rotating component consists completely or partially of plastic.
  • the hub consists of plastic, and the outer wall of the hub is designed so that the hub can be connected to the rotating component with positive locking.
  • the present invention provides at least a blower, including an impeller assembly and a motor, where the impeller assembly includes an impeller and a connecting disc connected to the impeller, and the motor includes a motor shaft.
  • the connecting disc is provided with a through hole, an internal thread in a first rotation direction is disposed on the through hole, the motor shaft has a first part and a second part, and the first part is provided with an external thread that is in the first rotation direction and that matches the internal thread of the through hole, to allow the connecting disc to be in threaded connection to the first part of the motor shaft.
  • the second part extends to an end portion of the motor shaft, a lock nut is fixedly connected to the second part and is in axial contact with at least a part of the connecting disc, to limit an axial movement of the connecting disc out of the motor shaft.
  • the through hole is columnar and protruded on at least one side surface of the connecting disc.
  • an axial length of the through hole is equal to an axial length of the first part.
  • the lock nut is provided with an internal thread in a second rotation direction; and the second part is provided with an external thread in the second rotation direction, and the second part is connected to the internal thread of the lock nut by the external thread.
  • the first rotation direction is opposite to the second rotation direction.
  • an outer diameter of the second part is less than an outer diameter of the first part to allow the output shaft to freely pass through the through hole, to achieve a threaded connection between the first part and the through hole and simpler assembly.
  • the lock nut includes an end portion towards the through hole, the end portion is provided with a second groove, and a width of the second groove is not less than the outer diameter of the first part, so that the end portion of the lock nut is not in contact with the first part.
  • the motor shaft has a third part, the third part is adjacent to the first part and is located on one side far away from the second part, the third part has a smooth surface, and an outer diameter of the third part is equal to an outer diameter of the first part.
  • the internal thread of the through hole is connected to a tail end, close to the third part, of the external thread of the first part. In this way, the limiting is achieved by the threaded connection in a specific range to fix the impeller assembly to a position set by the motor output shaft.
  • a household appliance including a body, and further including the foregoing blower disposed in the body.
  • the household appliance further includes a control device, where the control device is configured to cause an impeller assembly to selectively rotate in a first rotation direction or a second rotation direction according to a program setting.
  • FIG. 1 and FIG. 2 show schematic exploded views of a main structure of a blower.
  • FIG. 3 to FIG. 5 show schematic views of a connection structure of a motor output shaft and an impeller assembly in a blower.
  • the blower 1 includes an impeller assembly 2 and a motor 3, where the impeller assembly 2 is connected by the motor output shaft 30, to drive the rotation of the impeller assembly 2 by the motor 3.
  • the impeller assembly 2 includes an impeller 20 and a connecting disc 21 connected to the impeller 20.
  • the impeller 20 includes a wheel 201 and a plurality of blades 202 disposed on a periphery of the wheel 201.
  • the connecting disc 21 may be connected to the wheel 201, or in other cases, the wheel 201 may also be integral with the connecting disc 21.
  • the connecting disc 21 is provided with a through hole 211 through which the motor output shaft 30 is connected, and the through hole 211 may be in threaded connection to the output shaft 30.
  • the threaded connection avoids the risk of larger noise caused by due to poor assembly of a clearance fit between a shaft and a hole in the traditional manner. This risk can be reduced to a larger extent by screw assembly and screw limiting.
  • the through hole 211 may be provided in a middle part of the connecting disc 21 and may be protruded from the middle part of the connecting disc 21 to form a columnar through hole 211.
  • the columnar through hole 211 may be protruded from at least one side of the connecting disc 21.
  • the meaning of the middle part herein is not limited to being a central position of the connecting disc 21.
  • the motor output shaft 30 has a first part 301 and a second part 302, where the second part 302 extends to an end portion of the motor output shaft 30.
  • an outer diameter of the second part 302 of the motor output shaft 30 is less than an outer diameter of the first part 301.
  • the second part 302 of the motor output shaft 30 may pass through the through hole 211, so that the first part 301 of the output shaft 30 is in threaded connection to the through hole 211.
  • the outer diameter herein may be understood as a nominal diameter of a thread set on the output shaft, that is, a large diameter of the thread, or a diameter of an outer surface of the thread for the part containing the external thread.
  • the through hole 211 is in threaded connection to the motor output shaft 30.
  • the through hole 211 is provided with an internal thread in a first rotation direction X
  • the first part 301 of the output shaft 30 is provided with an external thread that is in the first rotation direction X and that matches with the internal thread of the through hole 211, to allow the connecting disc 21 to be in threaded connection to the first part 301 of the motor output shaft 30.
  • the blower 1 further includes a lock nut 4 connected to the end portion of the motor output shaft 30.
  • the lock nut 4 is fixedly connected to the second part 302 of the output shaft 30 and in axial partial contact with the connecting disc 21, to limit an axial movement of the connecting disc 21 out of the motor output shaft 30.
  • the lock nut 4 includes an end portion 40 towards the through hole and a first groove 401 and a second groove 402 coaxially provided in the end portion 40, where a width of the first groove 401 is less than a width of the second groove 402, and the first groove 401 is in threaded connection to the second part 302 of the output shaft 30.
  • the width of the second groove 402 is not less than the outer diameter of the first part 301.
  • the width of the second groove 402 is equal to the outer diameter of the first part 301.
  • an outer diameter of the end portion 40 of the lock nut 4 is no greater than an outer diameter of the through hole 211, so that the end portion of the lock nut is at least in partial contact with an end surface of the through hole.
  • the lock nut 4 may be pressed on the protruded end surface 212 disposed in the through hole 211, so that there is a sufficiently large frictional force between the connecting disc 21 and the lock nut 4 to cause the lock nut 4 to lock when the output shaft 30 rotates the connecting disc 21. Moreover, when the lock nut 4 is pressed on the end surface of the through hole, the lock nut 4 is provided with the second groove, so that the end surface of the first part is not in contact with the lock nut. According to the claimed invention, the lock nut 4 is provided with an internal thread in a second rotation direction Y.
  • the second part 302 of the output shaft 30 is provided with an external thread in the second rotation direction Y, and the second part 302 is connected to the internal thread of the lock nut 4 by the external thread.
  • the first rotation direction X is opposite to the second rotation direction Y.
  • the first rotation direction is a counterclockwise rotation direction, that is, the through hole is provided with a left-handed internal thread
  • the first part of the motor output shaft is provided with a left-handed external thread.
  • the corresponding second rotation direction is a clockwise rotation direction, that is, the lock nut is provided with a right-handed internal thread
  • the second part of the motor output shaft is provided with a right-handed external thread.
  • the first part is tightened with the left-hand thread of the through hole when the impeller assembly is in forward rotation and the second part is tightened with the right-hand thread of the nut when the impeller assembly is in reverse rotation, and the anti-loosening effect is achieved by rotating in both forward and reverse directions.
  • the threaded connection avoids the risk of disturbing an original balance of the blower after reassembly after disassembly, and achieves fool-proofing.
  • an axial length of the through hole 211 is equal to an axial length of the first part 301 of the output shaft. More specifically, in some cases, an axial length of the internal thread of the through hole is equal to an axial length of the external thread of the first part of the output shaft, and the internal thread matches the external thread, to better limit the thread position.
  • the motor output shaft 30 has a third part 303, the third part 303 is adjacent to the first part 301 and is located on one side far away from the second part 302, the third part 303 has a smooth surface, and an outer diameter of the third part is equal to an outer diameter of the first part 301.
  • the internal thread of the through hole 211 is connected to a tail end, close to the third part 303, of the external thread of the first part 301.
  • An embodiment of the present invention further discloses a household appliance.
  • the household appliance includes the foregoing blower.
  • the household appliance further includes a control device, and the control device is configured to cause an impeller assembly to selectively rotate in a first rotation direction or a second rotation direction according to a program setting.
  • the household appliance is a range hood, including a body, and the foregoing blower disposed in the body.
  • the blower includes a housing, an impeller assembly and a motor are disposed in the housing, and the impeller assembly is connected through the motor output shaft.
  • the range hood further includes a control device by which the motor may be controlled and selectively drive the impeller assembly in the forward rotation or reverse rotation.
  • the impeller assembly is driven to rotate in a forward direction during the normal operation of the range hood and the exhaust of grease and smoke.
  • the impeller assembly may be selectively controlled and driven in the forward rotation or reverse rotation.
  • the range hood using the foregoing blower avoids the risk of disturbing a dynamic balance of an original system when the impeller is installed reversely during after-sales cleaning and maintenance, and achieves effective fool-proofing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP21206211.1A 2020-11-12 2021-11-03 Blower and household appliance Active EP4001664B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011259594.XA CN114483616A (zh) 2020-11-12 2020-11-12 风机和家用电器

Publications (2)

Publication Number Publication Date
EP4001664A1 EP4001664A1 (en) 2022-05-25
EP4001664B1 true EP4001664B1 (en) 2024-06-26

Family

ID=78516626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21206211.1A Active EP4001664B1 (en) 2020-11-12 2021-11-03 Blower and household appliance

Country Status (3)

Country Link
EP (1) EP4001664B1 (pl)
CN (1) CN114483616A (pl)
PL (1) PL4001664T3 (pl)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116838624A (zh) * 2023-05-12 2023-10-03 宁波方太厨具有限公司 一种风机系统及应用有该风机系统的吸油烟机

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003028093A (ja) * 2001-07-11 2003-01-29 Mitsubishi Heavy Ind Ltd 羽根車の整流部材取付け構造
DE20317573U1 (de) * 2003-11-14 2005-03-31 Gronbach Forschungs Und Entwic Kunststoffnabe
CN211296450U (zh) * 2019-12-04 2020-08-18 九阳股份有限公司 一种电机反转防松连接结构及吸油烟机
CN111102240B (zh) * 2019-12-18 2025-06-03 珠海格力电器股份有限公司 具有自锁效果的叶轮锁紧结构及离心式压缩机

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Publication number Publication date
PL4001664T3 (pl) 2024-10-14
CN114483616A (zh) 2022-05-13
EP4001664A1 (en) 2022-05-25

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