EP4317699A1 - Unité de ventilateur à bruit de rotation réduit - Google Patents

Unité de ventilateur à bruit de rotation réduit Download PDF

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Publication number
EP4317699A1
EP4317699A1 EP22188872.0A EP22188872A EP4317699A1 EP 4317699 A1 EP4317699 A1 EP 4317699A1 EP 22188872 A EP22188872 A EP 22188872A EP 4317699 A1 EP4317699 A1 EP 4317699A1
Authority
EP
European Patent Office
Prior art keywords
blower
plastic
diffuser
cover
rotor
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
EP22188872.0A
Other languages
German (de)
English (en)
Inventor
Mathias Varnhorst
Klaus Günzel
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.)
Vorwerk and Co Interholding GmbH
Original Assignee
Vorwerk and Co Interholding 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 Vorwerk and Co Interholding GmbH filed Critical Vorwerk and Co Interholding GmbH
Priority to EP22188872.0A priority Critical patent/EP4317699A1/fr
Priority to CN202310916365.8A priority patent/CN117514929A/zh
Publication of EP4317699A1 publication Critical patent/EP4317699A1/fr
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/22—Mountings for motor fan assemblies
    • 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
    • F04D17/06—Helico-centrifugal pumps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L5/00—Structural features of suction cleaners
    • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
    • A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
    • A47L5/24—Hand-supported suction cleaners
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
    • 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
    • F04D29/023—Selection of particular materials 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/403—Casings; Connections of working fluid 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
    • F04D29/40—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
    • F04D29/4253—Fan casings with axial entry and discharge
    • 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
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers 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
    • F04D29/60—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
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • 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
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F05D2260/37—Retaining components in desired mutual position by a press fit connection
    • 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
    • F05D2260/00—Function
    • F05D2260/96—Preventing, counteracting or reducing vibration or noise
    • 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
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
    • 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
    • F05D2300/501—Elasticity
    • 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
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/603—Composites; e.g. fibre-reinforced

Definitions

  • the invention relates to a blower unit with the features of the first independent patent claim and a vacuum cleaner with the features of the further independent patent claim.
  • blower units e.g. vacuum cleaners
  • blower units sometimes cause considerable noise emissions. These can in turn have a negative effect in the area surrounding the blower unit or have a disruptive effect on a user of the blower unit.
  • a major component of the noise emitted by a blower unit is the rotating sound.
  • the cause of the rotating sound lies, among other things, in the interaction between static and rotating elements of the blower unit, which causes a periodically fluctuating flow and thus a periodically fluctuating force on various components of the blower unit. This ultimately leads to a vibration of individual, especially static, components of the blower unit, which is ultimately transmitted to the air and can be perceived as noise.
  • a known measure for reducing the rotating sound of blower units is to arrange a damping or elastic material in transition areas or joints between two static components (e.g. housing parts) of a blower unit, so that the relevant components of the blower unit are not directly or essentially directly with one another are in contact but only indirectly through that between the Damping or elastic material arranged on components.
  • the relevant components are thereby at least partially decoupled from a vibration point of view. This means that the transmission of vibrations from one component to the other can be reduced or avoided and the rotating sound of the blower unit can therefore be reduced overall.
  • the damping or elastic material can be, for example, a plastic or a rubber.
  • damping or elastic materials does not make sense in all applications.
  • the use of such materials is problematic, particularly in the case of components that interact directly with a rotor of the blower unit (e.g. surround the rotor at least in sections).
  • the reason for this is that in order to optimize the efficiency of the rotor, it is desirable to have the smallest possible gap between the rotor of a blower unit (or the blades of the rotor) and a component that at least partially surrounds the rotor in order to thereby minimize aerodynamic losses.
  • the use of a damping or elastic material for vibration-related decoupling of the component surrounding the rotor at least in sections from other components of the blower unit enables relative displacements of the components in question to one another, which ultimately creates the risk of the rotor brushing against the housing part surrounding the rotor at least in sections .
  • This can lead to mechanical damage to the rotor or to the component of the blower unit that at least partially surrounds the rotor.
  • An increase in gap losses in the rotor in question and thus a reduction in the efficiency of the blower unit is also conceivable in this context.
  • the use of damping or elastic materials and the arrangement of these materials at contact points of various components increases the material costs and the assembly effort of a blower unit.
  • a blower unit in particular for use in a vacuum cleaner, comprising a blower rotor, a blower cover and a diffuser, the blower rotor being rotatably arranged in the blower cover at least in sections by a motor and the blower cover and the diffuser being connected to one another in this way at least in sections in that the blower cover and the guide apparatus form, at least in sections, a common flow housing or at least in sections a common boundary of a flow channel and wherein the fan cover is formed at least in sections from a first plastic and the guide apparatus is formed at least in sections from a second plastic that is different from the first is.
  • a blower unit which comprises at least one blower rotor, a blower cover and a diffuser.
  • the blower cover is arranged in such a way that it surrounds the blower rotor at least in sections or completely or forms a housing around the blower rotor at least in sections, so that the blower rotor can rotate in the blower cover. If the blower rotor is set in rotation, the blower rotor interacts with the blower cover via the flow guided through the blower rotor or between the blower rotor and the blower cover.
  • the blower rotor is rotatably mounted in the blower unit, in particular on a shaft, so that it can be set in rotation via a motor of the blower unit.
  • the blower cover and the blower rotor form, at least in sections, a common flow channel or a common flow housing, wherein an air flow sucked in by the blower rotor is passed or can be passed through the flow channel or the flow housing.
  • the blower rotor forms at least one hub contour or inner wall of the flow channel or flow housing and the blower cover forms at least one housing contour or outer wall of the flow housing or flow channel.
  • at least one rotor blade of the fan rotor extends at least in sections between the hub contour and the housing contour.
  • the blower cover of the blower unit is further connected to the diffuser of the blower unit, in particular to an outer wall of the diffuser, with the blower cover and the diffuser forming a common flow housing at least in sections.
  • the blower cover and the guide apparatus are in direct or substantially direct contact with one another, at least in sections.
  • the blower cover and the guide apparatus, in particular where the guide apparatus and the blower cover are connected to one another touch each other directly or essentially directly (in the sense of: directly), at least in sections. It can therefore be provided that, particularly where the blower cover and the diffuser are connected to one another, no damping or elastic material is arranged between the blower cover and the diffuser.
  • blower cover is connected at least in sections to an outer wall of the nozzle, so that preferably the blower cover and the outer wall of the nozzle form a common outer wall of a flow channel of the blower unit, in particular the flow channel extends at least in sections over the blower cover or blower rotor and extends the guide apparatus.
  • essentially direct contact is also understood to mean that at least in sections a, preferably thin, intermediate layer, in particular an adhesive layer, is arranged between the components in question, which, however, is not suitable for vibration-related decoupling of the two components.
  • adhesive layers for connecting components are deliberately made thin so that a There is essentially direct contact between the relevant components.
  • the presence of an adhesive bond for connecting two components is also understood to mean direct or essentially direct contact between the components.
  • the blower cover is formed at least in sections, in particular predominantly or completely, from a first plastic and the guide apparatus is formed at least in sections, in particular predominantly or completely, from a second plastic that is different from the first.
  • the first plastic is therefore designed to be different in terms of material and the corresponding material properties (at least partially or completely) from the material of the second plastic and its material properties.
  • at least those sections of the blower cover which are in direct contact with the nozzle are made of the first plastic and at least those sections of the nozzle which are in direct contact with the blower cover are made of the second plastic.
  • At least the inner wall and/or the outer wall is formed at least in sections, in particular completely, from the second plastic. It has proven to be particularly advantageous in terms of vibration decoupling of the blower cover and the diffuser if the blower cover is made entirely of the first plastic and/or at least the outer wall of the diffuser is made of the second plastic or the diffuser is made entirely of the second plastic is.
  • a blower unit according to the invention has the advantage that the blower cover and the guide device are at least partially decoupled from one another in terms of vibration technology by using different plastics. If, during operation of the blower unit, the blower cover is stimulated by the rotor rotating in the blower cover or the air flow sucked in by the rotor, the vibration of the blower cover is not transmitted or not completely transmitted to the diffuser due to the different material properties of the blower cover and diffuser. The rotating sound of the blower unit is therefore reduced compared to a uniform material design of the blower cover and diffuser. Furthermore, the goal of reducing rotating sound is determined solely by the choice of material for the blower cover and guide apparatus achieved.
  • the use of a damping or elastic material to decouple the guide device and the blower cover can therefore be omitted, which allows the blower unit to be manufactured particularly cost-effectively and easily. There is also no need for regular renewal of the damping or elastic material in the life cycle of a blower unit, which can increase the reliability of the blower unit.
  • the diffuser and the blower cover can be fixed in their position relative to one another. This in turn allows the gap between the blower cover and the blower rotor or the rotor blades of the blower rotor to be made particularly small, which in turn enables particularly low gap losses and a correspondingly higher efficiency or energy-efficient operation of the blower rotor.
  • the blower rotor serves to suck air into the blower through an inlet opening of the blower unit or the blower cover or to introduce kinetic energy into the air flow. It can be provided within the scope of the invention that the fan rotor comprises at least one, preferably several, rotor blades, preferably in order to introduce kinetic energy into the air flow sucked in by the fan rotor.
  • the guide device serves to influence a swirling air flow emerging from the fan rotor in terms of its flow direction and speed.
  • the diffuser is designed in such a way that at least the swirl or the peripheral speed of an air flow emerging from the fan rotor is reduced or can be reduced by the diffuser and / or an axial or essentially axial outflow from the diffuser is realized or can be realized.
  • the diffuser is designed in such a way that at least the axial velocity of an air flow emerging from the fan rotor is reduced or can be reduced by the diffuser.
  • the guide apparatus comprises at least one guide vane.
  • an axial flow direction or an axial extent means a flow direction or extent that is parallel to the axis of rotation of the fan rotor.
  • a flow housing should be understood as a housing in which at least one flow channel is formed, the flow channel being at least partially delimited by the housing, so that a fluid flow, preferably a Air flow can be guided through the flow channel or through the flow housing.
  • the guide apparatus comprises an inner wall and an outer wall, with the inner wall and the outer wall forming a flow channel or a flow housing at least in sections.
  • the diffuser is arranged in the blower unit in such a way that an air flow emerging from the blower rotor, in particular from a flow channel or flow housing formed by the blower rotor and the blower cover, is directed into the flow channel or the flow housing of the diffuser or . can be conducted.
  • the blower unit comprises at least one motor, wherein the motor can be brought into operative connection with the blower rotor in such a way that the blower rotor can be set in rotation by the motor.
  • the fan rotor is arranged on a shaft, wherein the shaft can be driven by the motor or set in rotation.
  • the motor can preferably be designed as an electric motor.
  • the first plastic of the blower cover has a larger modulus of elasticity than the second plastic of the diffuser, in particular that the modulus of elasticity of the first plastic is at least twice, preferably three times, as large as the modulus of elasticity of the second plastic. This has shown the advantage that the transmission of vibrations from the blower cover to the diffuser can be effectively reduced.
  • the first plastic from the blower cover has a modulus of elasticity of at least 5000 MPa, in particular at least 6000 MPa, preferably at least 7000 MPa, particularly preferably at least 7200 MPa or 7200 MPa and / or that the second plastic from the diffuser has a modulus of elasticity of at least 1000 MPa, in particular at least 1500 MPa, preferably at least 2000 MPa, particularly preferably at least 2400 MPa or 2400 MPa.
  • a selection of the first and second plastics, each with a modulus of elasticity in the above-mentioned value ranges, has proven to be particularly advantageous with regard to vibration decoupling of the blower cover and the control device. It has proven to be particularly advantageous if the first plastic of the blower cover has a modulus of elasticity of 7200 MPa and the second plastic of the diffuser has a modulus of elasticity of 2400 MPa.
  • the first plastic from the blower cover has a greater density than the second plastic from the guide apparatus. This has shown the advantage that the transmission of vibrations from the blower cover to the diffuser can be effectively reduced. Also or alternatively, it can be provided that the first plastic of the blower cover has a density of at least 1200 kg/m 3 , in particular at least 1250 kg/m 3 , preferably at least 1290 kg/m 3 or 1290 kg/m 3 and/or that the second plastic from the guide apparatus has a density of at least 1100 kg/m 3 , in particular at least 1150 kg/m 3 , preferably at least 1200 kg/m 3 or 1200 kg/m 3 .
  • first plastic of the blower cover with a modulus of elasticity of 7200 MPa and a density of 1290 kg/m 3 and also a second plastic with a modulus of elasticity of 2400 MPa and a density of 1200 kg/m 3 has to be considered in terms of vibration technology Decoupling the guide apparatus from the blower cover and thus for reducing the rotating sound of a blower unit according to the invention has proven to be particularly advantageous.
  • A is greater than or equal to 1.5 and an integer multiple of 0.5.
  • E Lid ⁇ ⁇ Guidance apparatus E Guidance apparatus ⁇ ⁇ Lid ⁇ 2
  • an outer wall of the diffuser and the blower cover overlap at least in sections, the axial extent of the overlap between the blower cover and the outer wall of the diffuser being 45% or less of the axial extent of the outer wall of the diffuser.
  • a, in particular cylindrical or circumferential, joint is formed by the overlap of the blower cover and the guide apparatus or the outer wall of the guide apparatus, the joint preferably running in the axial or substantially axial direction.
  • the diffuser or the outer wall of the diffuser and the blower cover are at least partially connected to one another in the area of the overlap.
  • the diameter (D1) of an outer wall of the nozzle is selected such that the following relationship between the diameter, preferably outer diameter, (D1) of the outer wall, a design speed (n rotor ) of the fan rotor and a number (N blades ) of the rotor blades arranged on the fan rotor is fulfilled: D 1 ⁇ 0.025 ⁇ n rotor ⁇ N Shovels ⁇
  • a design speed should be understood to mean the nominal speed of the blower rotor or the speed for which the blower rotor was designed and/or at which the blower rotor is to be operated.
  • the value of the circle number ⁇ is 3.142.
  • blower cover and/or the guide apparatus are each designed, at least in sections, as an injection-molded part. This results in the advantage of a particularly cost-effective and efficient production of the diffuser and/or the blower cover.
  • At least the blower cover and/or the guide apparatus are formed, at least in sections, from a fiber-reinforced plastic or that the first plastic and/or the second plastic is a fiber-reinforced plastic.
  • the fibers contained in the plastic are glass fibers, metal fibers, carbon fibers, plastic fibers and/or natural fibers.
  • the use of glass fibers has proven to be particularly advantageous in this context. It has also proven to be particularly advantageous to design at least the first plastic as a fiber-reinforced plastic.
  • the fiber content of a fiber-reinforced plastic can be at least 10%, at least 15%, at least 20% or 20% (percent by mass).
  • the respective material properties can be influenced in a targeted manner.
  • At least the first plastic of the blower cover and/or the second plastic of the nozzle comprise at least one additive.
  • At least one additive may be a plasticizer, an antioxidant, a light stabilizer, a heat stabilizer, a flame retardant, a colorant, or a filler.
  • the material characteristics of the first and second plastic can be specifically influenced and/or additional advantages can be achieved.
  • a filler a more cost-effective production of a blower unit according to the invention can be achieved.
  • the service life can also be positively influenced by using an antioxidant and/or heat stabilizer and/or plasticizer.
  • connection between the blower cover and the diffuser is designed at least in sections (or completely) as a positive and / or non-positive and / or cohesive connection.
  • connection between the blower cover and the nozzle is designed as a screw connection or bayonet connection.
  • the blower cover comprises at least one thread (external thread or internal thread) and the diffuser comprises a thread (external thread or internal thread) that is compatible or complementary to the at least one thread of the blower cover, so that the blower cover and the diffuser, in particular can be screwed together (or hooked in the case of a bayonet connection) by rotating the diffuser relative to the blower cover or vice versa.
  • a cohesive connection it can also be provided that the blower cover and the guide apparatus are glued and/or welded to one another at least in sections.
  • connection between the blower cover and the diffuser is designed at least as a press connection.
  • the guide device is pressed or can be pressed into the blower cover at least in sections.
  • the blower cover is pressed or can be pressed into the diffuser at least in sections.
  • At least one, preferably circumferential, rib is formed on the blower cover. This can increase the stability and the Longevity of the blower cover can be increased. Furthermore, the vibration behavior of the blower cover can be influenced positively, in the sense of a reduced rotational sound, by arranging at least one rib, in particular several ribs, on the blower cover.
  • a vacuum cleaner according to the invention comprising at least one blower unit according to the invention or at least one blower unit according to one of claims 1 to 14.
  • a vacuum cleaner according to the invention the same advantages arise as have already been described in relation to a blower unit according to the invention .
  • the invention also includes an extractor device or a leaf blower with the blower unit according to the invention.
  • Fig. 1 shows a sectional view of a blower unit 1 according to the invention.
  • the blower unit 1 comprises a blower rotor 2, a blower cover 3 and a diffuser 4.
  • the blower rotor 2 is arranged at least in sections in the blower cover 3 so that it can be rotated by a motor.
  • the blower cover 3 is arranged such that it surrounds the blower rotor 2 at least in sections or forms a housing around the blower rotor 2.
  • the blower rotor 2 is further arranged on a shaft 5 encompassed by the blower unit 1 or is rotatably mounted in the blower unit 1 via the shaft 5, so that it can be set in rotation via a motor of the blower unit 1.
  • the rotation of the fan rotor 2 takes place about the axis of rotation R.
  • an air flow S is created through an inlet opening 8 in the blower unit 1 is sucked in.
  • the inlet opening 8 is formed by the blower cover 3.
  • the blower cover 3 and the blower rotor 2 form, at least in sections, a common flow housing 6 or at least in sections a boundary of a flow channel 7, with an air flow S sucked in by the blower rotor 2 being able to pass through the flow channel 7 or through the flow housing 6.
  • the fan cover 3 forms at least one outer wall of the flow channel 7 and the fan rotor 2 forms at least one inner wall of the flow channel 7.
  • a plurality of rotor blades 2.1 enclosed by the fan rotor 2 extend between the outer wall and the inner wall of the flow channel.
  • the guide apparatus 4 comprises an inner wall 4.2 and an outer wall 4.1, the inner wall 4.2 and the outer wall 4.1 forming a flow channel 7 or a flow housing 6 at least in sections.
  • blower cover 3 and the diffuser 4 are at least partially connected to one another in such a way that the blower cover 3 and the diffuser 4 at least partially form a common flow housing 6 or at least partially a common boundary of a flow channel 7. Furthermore, it is provided that the blower cover 3 is formed at least in sections from a first plastic and the guide apparatus 4 is at least partially formed from a second plastic that is different from the first.
  • the material change according to the invention between the blower cover 3 and the diffuser 4 results in an at least partial vibration decoupling of the blower cover 3 and the diffuser 4 and thereby a reduction in the rotating sound or noise generated by the blower unit 1 during operation.
  • the blower cover 3 is connected to an outer wall 4.1 of the nozzle 4, with the blower cover 3 and the nozzle 4 forming a common flow housing 6 or a common boundary of a flow channel 7 in the area of the connection between the blower cover 3 and the nozzle 4.
  • An air flow S emerging from the blower rotor 2 or the flow housing 6 formed from the blower rotor 2 and blower cover 3 can thus be guided directly into the diffuser 4.
  • connection between the blower cover 3 and the diffuser 4 is realized via a press connection, with the diffuser 4 being pressed into the blower cover 3 at least in sections.
  • the outer wall 4.1 of the diffuser 4 and the blower cover 3 overlap at least in sections, with the cylindrical or circumferential joint 9 being formed by the overlap.
  • the blower cover 3 and the diffuser 4 or the outer wall 4.1 of the diffuser 4 are in direct contact or touch each other directly, at least in sections.
  • the arrangement of an elastic or damping material in the joint 9 is omitted in the present case, which results in a correspondingly simpler and more cost-effective assembly of the blower unit 1 as well as a more efficient and safer operation of the same.
  • an adhesive layer can preferably be provided at least in sections for connecting the blower cover 3 to the outer wall 4.1 of the guide apparatus 4 by an adhesive connection.
  • the axial extent L1 of the overlap of the blower cover 3 and the outer wall 4.1 of the diffuser 4 is in the present case less than 45% of the axial extent L2 of the outer wall 4.1 of the diffuser 4. This allows the transmission of vibrations from the blower cover 3 to the diffuser 4 and thus the The rotating sound of the fan unit 1 can be reduced. Furthermore, this approach leads to a compact dimensioning of the diffuser 4 and the blower cover 3 and thus to a material- and weight-saving design of the blower unit 1.
  • blower cover 3 Furthermore, two circumferential ribs 3.1 are formed on the blower cover 3, whereby at least the stability and longevity of the blower cover 3 can be improved.
  • the blower cover 3 is formed at least in sections from a first plastic and the guide apparatus 4 is formed at least in sections from a second plastic that is different from the first.
  • the modulus of elasticity of the first plastic of the blower cover 3 is greater than the modulus of elasticity of the second Plastic of the nozzle 4 and is 7200 MPa, while the modulus of elasticity of the second plastic of the nozzle 4 is 2400 MPa.
  • the density of the first plastic of the blower cover 3 is greater than the density of the second plastic of the diffuser 4 and is 1290 kg/m 3 , while the density of the second plastic of the diffuser 4 is 1200 kg/m 3 .
  • the diameter D1 (outer diameter) of the outer wall 4.1 of the diffuser 4 is selected such that the following relationship between the diameter D1 of the outer wall 4.1, a design speed n rotor of the fan rotor 2 and a number N blades of the rotor blades 2.1 arranged on the fan rotor 2 is met: D 1 ⁇ 0.025 ⁇ n rotor ⁇ N Shovels ⁇
  • FIG. 2 a vacuum cleaner 50 according to the invention, comprising at least one blower unit 1 according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP22188872.0A 2022-08-04 2022-08-04 Unité de ventilateur à bruit de rotation réduit Pending EP4317699A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22188872.0A EP4317699A1 (fr) 2022-08-04 2022-08-04 Unité de ventilateur à bruit de rotation réduit
CN202310916365.8A CN117514929A (zh) 2022-08-04 2023-07-25 转动声减小的风扇单元

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22188872.0A EP4317699A1 (fr) 2022-08-04 2022-08-04 Unité de ventilateur à bruit de rotation réduit

Publications (1)

Publication Number Publication Date
EP4317699A1 true EP4317699A1 (fr) 2024-02-07

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ID=82839244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22188872.0A Pending EP4317699A1 (fr) 2022-08-04 2022-08-04 Unité de ventilateur à bruit de rotation réduit

Country Status (2)

Country Link
EP (1) EP4317699A1 (fr)
CN (1) CN117514929A (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150219120A1 (en) * 2014-01-31 2015-08-06 Asia Vital Components Co., Ltd. Fan frame body structure
EP3376047A1 (fr) * 2015-11-09 2018-09-19 Nidec Corporation Dispositif de soufflante, et aspirateur
JP2019105216A (ja) * 2017-12-13 2019-06-27 日立グローバルライフソリューションズ株式会社 電動送風機及びそれを搭載した電気掃除機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150219120A1 (en) * 2014-01-31 2015-08-06 Asia Vital Components Co., Ltd. Fan frame body structure
EP3376047A1 (fr) * 2015-11-09 2018-09-19 Nidec Corporation Dispositif de soufflante, et aspirateur
JP2019105216A (ja) * 2017-12-13 2019-06-27 日立グローバルライフソリューションズ株式会社 電動送風機及びそれを搭載した電気掃除機

Also Published As

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