US20220034328A1 - Radial ventilator - Google Patents
Radial ventilator Download PDFInfo
- Publication number
- US20220034328A1 US20220034328A1 US17/279,954 US201917279954A US2022034328A1 US 20220034328 A1 US20220034328 A1 US 20220034328A1 US 201917279954 A US201917279954 A US 201917279954A US 2022034328 A1 US2022034328 A1 US 2022034328A1
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- United States
- Prior art keywords
- ventilator
- radial
- pressure chamber
- extrusion coating
- axial
- 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.)
- Abandoned
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- 238000007765 extrusion coating Methods 0.000 claims abstract description 33
- 238000007373 indentation Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- 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
-
- 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
- F04D29/02—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
- F04D29/05—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
- F04D29/40—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
- F04D29/40—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
- F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
-
- 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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
- F16C19/546—Systems with spaced apart rolling bearings including at least one angular contact bearing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
- F16C19/546—Systems with spaced apart rolling bearings including at least one angular contact bearing
- F16C19/547—Systems with spaced apart rolling bearings including at least one angular contact bearing with two angular contact rolling bearings
- F16C19/548—Systems with spaced apart rolling bearings including at least one angular contact bearing with two angular contact rolling bearings in O-arrangement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
- F16C25/06—Ball or roller bearings
- F16C25/08—Ball or roller bearings self-adjusting
- F16C25/083—Ball or roller bearings self-adjusting with resilient means acting axially on a race ring to preload the bearing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
-
- 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
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/52—Outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/46—Fans, e.g. ventilators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
- H02K2205/09—Machines characterised by drain passages or by venting, breathing or pressure compensating means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2211/00—Specific aspects not provided for in the other groups of this subclass relating to measuring or protective devices or electric components
- H02K2211/03—Machines characterised by circuit boards, e.g. pcb
Definitions
- the disclosure relates to a radial ventilator and, more specifically, to a high-speed radial ventilator in a compact construction.
- Corresponding radial ventilators include multiple housing parts to receive the motor and forming the flow path from the intake via the pressure chamber to the discharge. The flow is to be conveyed as optimally as possible from the intake to the discharge, at the same time. Good flow conditions improve the efficiency, the pressure buildup, and the acoustics of the radial fan. Radial ventilators typically have a spiral-type housing, that receives the rapid flow emitted by the radial wheel, decelerates it, and finally converts it into usable pressure. A smooth deceleration is advantageous for the pressure buildup.
- the disclosure is based on the object of providing a radial ventilator that has a compact structure with a small number of parts. At the same time, it has a high efficiency with improved acoustics.
- a radial ventilator comprising: a base part, a housing part placed on the base part, a motor electronics unit and an internal rotor electric motor; a ventilator wheel drive via a shaft with electric motor; with a discharge, the motor electronics unit and a stator of the electric motor are encapsulated by extrusion coating in the base part and together form an integral one-piece structural unit; the radial ventilator has a pressure chamber expanding in a spiral shape around the ventilator wheel.
- a radial ventilator has a base part, a housing part placed on the base part with a discharge.
- a motor electronics unit and an internal rotor electric motor is included.
- the electric motor drives a ventilator wheel via a shaft.
- the motor electronics unit and a stator of the electric motor are encapsulated in the base part by an extrusion coating. Together they form an integral one-piece structural unit.
- the radial ventilator moreover has a pressure chamber expanding in a spiral shape around the ventilator wheel. It is formed and defined by the housing part and the extrusion coating.
- thermosetting plastic based on epoxy is used as the extrusion coating and processed in an injection molding.
- the extrusion coating forms the structure of the base part to receive the motor electronics unit and the stator. Corresponding cavities are provided for this purpose in the extrusion coating.
- plug devices for electrically connecting the radial ventilator for example a connection plug or a plug housing, can also be integrated into the extrusion coating and in particular formed on the outside on the base part.
- the one-piece design of the extrusion coating is used together with the housing part in order to provide the spiral-shaped geometry of the pressure chamber. Additional components are not required.
- the extrusion coating comprises a protruding ring section extending in the axial direction in relation to the housing part.
- the axial end face defines the pressure chamber.
- the ring section protrudes enough in relation to the remaining region of the base part that it provides a receptacle chamber for the motor electronics unit which is media-separated from the pressure chamber. It encloses the motor electronics components.
- the axial extension of the ring section and the axial end face are geometrically established so that the spiral shape of the pressure chamber is formed.
- the spiral-shaped pressure chamber is created by an axial and radial expansion. The radial expansion takes place over the width of the axial end face and the axial expansion takes place over the axial height of the ring section.
- the radial ventilator housing part has a constant diameter delimiting the pressure chamber.
- a spiral shape of the pressure chamber is exclusively defined by the extrusion coating or the protruding ring section.
- the structural space of the radial ventilator is particularly compact in this embodiment.
- An embodiment is also advantageous where the electric motor is arranged on a first axial side of the motor electronics unit.
- the pressure chamber is arranged on a second axial side of the motor electronics unit, which is opposite to the first axial side.
- the motor electronics unit can thus be cooled via the adjoining flow through the pressure chamber.
- the motor group is separated from the flow by the motor electronics unit arranged axially in between the two.
- the motor electronics unit is preferably arranged on a printed circuit board.
- the printed circuit board is also completely enclosed by the extrusion coating.
- the fixing of the printed circuit board and the motor electronics unit or the motor electronics components arranged on the printed circuit board in the base part is carried out directly by the extrusion coating.
- the radial ventilator base part has a cylindrical recess around a rotational axis for the shaft, where a rotor of the electric motor fastened on the shaft is inserted.
- the cylindrical recess replicates a containment shroud of a containment shroud motor.
- the stator is positioned in the extrusion coating radially adjoining the recess.
- the recess has a closed bottom.
- the bottom is formed by the extrusion coating.
- the motor is thus completely encapsulated in the base part.
- a ring-shaped flow divider enclosing the ventilator wheel is arranged radially adjoining the ventilator wheel. Together with the housing part it forms a diffuser, that merges directly into the pressure chamber, around the ventilator wheel.
- the ventilator wheel it is important that it has a uniform counter pressure at the outlet over the entire circumference. Each blade of the ventilator wheel thus provides an optimum contribution to the flow. An uneven pressure distribution around the ventilator wheel would result in negative and undesired flow separations and back flows into the ventilator wheel.
- the flow divider is provided around the ventilator wheel.
- the ventilator wheel together with the ventilator housing, provides a diffuser for the flow exiting from the ventilator wheel. It has a direct flow connection to the pressure chamber and provides a uniform counter pressure for the ventilator wheel. The radially expelled air flows through the diffuser from the radial inside to the radial outside up to its radial end and then enters the pressure chamber.
- the entry into the pressure chamber is located radially adjoining the diffuser, however, the spiral-shaped pressure chamber itself is preferably formed axially adjoining the diffuser in an adjacent axial plane.
- the flow divider can extend far radially outward, so that the inflow takes place into the radial outside region of the housing part.
- its spiral-shaped pressure chamber and generates a defined corkscrew turbulence at the same time. Turbulence losses in the spiral-shaped pressure chamber can thus be reduced.
- the flow divider rests on the extrusion coating.
- the flow divider is formed as a sleeve that is inserted into the recess that replicates the containment shroud.
- the formation as a sleeve enables the flow divider to take over additional functions, for example mounting the shaft. Its position can be established at the same time in this way.
- the flow divider protrudes in the radial direction in relation to a radial inner wall surface of the extrusion coating and thus forms an axial surface of the pressure chamber.
- the spiral-shaped pressure chamber is located axially adjoining the diffuser.
- the flow divider advantageously forms a flow surface for the diffuser on a first axial side and forms an axial wall surface for the spiral-shaped pressure chamber on an opposing axial surface.
- the flow divider has a cup-like axial indentation with a diameter that corresponds to an external diameter of the ventilator wheel.
- the ventilator wheel is inserted axially in sections into the indentation.
- the flow discharged by the ventilator wheel is influenced immediately by the radially adjoining section of the flow divider that forms the diffuser.
- the indentation enables an axially compact construction of ventilator wheel and flow divider.
- the radial ventilator comprises at least one bearing for mounting the shaft. It is arranged between the flow divider and the shaft. Two axially spaced-apart bearings are preferably provided. They are tensioned via a spring and are each arranged between the flow divider and the shaft.
- the radial ventilator in one refinement, has a rounding at least in sections on its free end facing toward the pressure chamber.
- the rounding is provided on a radial end of the diffuser in order to improve the tangential inflow into the pressure chamber.
- the axially protruding ring section of the extrusion coating has, on its radial outer edge section, a circumferential axial projection that presses against an inner wall surface of the housing part.
- An axial indentation in the inner part in the pressure chamber results.
- FIG. 1 is a top plan view of a radial ventilator
- FIG. 2 is a sectional view along line B-B of FIG. 1 ;
- FIG. 3 is a sectional view along line A-A of FIG. 1 ;
- FIG. 4 is a perspective sectional view of the radial ventilator of FIG. 1 .
- FIGS. 1-4 An exemplary embodiment of a radial ventilator 1 according to the disclosure is shown in an axial top view, two sectional views A-A and B-B, and a perspective sectional view in FIGS. 1-4 .
- the radial ventilator 1 comprises an electric motor designed as an internal rotor motor having a rotor 22 and a stator 32 , that interact in the manner of a containment shroud motor.
- the magnets of the rotor 22 are fastened on the shaft 7 , that extends along the rotational axis RA axially through the radial ventilator 1 .
- the ventilator wheel 3 designed as a radial ventilator wheel is fixed on the shaft 7 . In operation, the ventilator wheel 3 suctions in air axially via the inlet 69 and discharges it via the pressure nozzle 33 at the discharge 44 via its impeller blades.
- the radial ventilator 1 has the base part 2 and the housing part 4 placed on the base part 2 that has the pressure nozzle 33 , that defines the discharge 44 .
- the base part 2 is an integral one-piece structural unit.
- the stator 32 of the electric motor, the printed circuit board 10 , and the motor electronics components 98 fixed on the printed circuit board 10 for regulating the radial ventilator 1 are encapsulated by the one-piece plastic extrusion coating 17 of the base part 2 .
- the cylindrical recess 92 is formed in the base part 2 around the rotational axis RA of the shaft 7 .
- the shaft 7 and the rotor 22 of the electric motor, fastened thereon, are inserted into the recess 92 in such a way that the rotor 22 and stator 32 lie on one axial plane.
- the bottom 77 of the recess 92 is closed by the extrusion coating 17 .
- the extrusion coating 17 forms the protruding ring section 11 extending in the axial direction in parallel to the rotational axis.
- the axial end face of the ring section 11 facing toward the housing part 4 , defines the spiral-shaped pressure chamber D together with the housing part 4 .
- the axial projection 18 is formed on the radial outside on the ring section 11 , which forms a contact surface to the inner wall surface of the housing part 4 .
- the axial end face of the ring section 11 is thus indented like a trough.
- the ring section 11 forms a receptacle chamber located on the radial inside for the motor electronics unit 98 , as may be seen well in FIG. 4 .
- the ring-shaped flow divider 8 enclosing the ventilator wheel 3 is arranged radially adjoining the ventilator wheel 3 .
- the flow divider 8 together with the inner wall surface of the housing part 4 , forms the diffuser 9 around the ventilator wheel 3 .
- the inner wall surface of the outer part 4 and the flow divider 8 extend radially outward perpendicularly to the rotational axis RA in the region of the diffuser 9 .
- the free end of the flow divider 8 forms the end of the diffuser 9 and has a rounding R.
- the diffuser 9 merges directly into the pressure chamber D.
- the spiral shape of the pressure chamber D is exclusively formed via the inner part 5 and, the housing part 4 having a constant diameter. It can be seen well with reference to FIGS.
- the pressure chamber D widens both axially and also radially due to the shaping of the ring section 11 .
- the flow divider 8 protrudes in the radial direction in relation to the radial inner wall surface 87 of the inner part 5 and partially forms an upper-side axial surface of the pressure chamber D.
- the pressure chamber D is formed axially offset, but directly adjoining the diffuser 9 .
- the pressure nozzle 33 with the discharge 44 is formed in one piece on the outer part 4 in extension of the pressure chamber D.
- the pressure nozzle 33 has a round cross section.
- the housing part 4 is sealed via a circumferential seal 25 in relation to the base part 2 on the radial outer wall surface of the ring section 11 . Furthermore, a plug device 93 , for plugging in a plug and contacting with the printed circuit board 10 , is provided in one piece on the base part 2 .
- the electronics components 98 are arranged, extrusion coated by the extrusion coating 17 , in the free space adjoining the pressure chamber D and thus facing toward the flow. Thus, a heat emission to the flow divider 8 and thus cooling take place.
- the flow divider 8 rests on the ring section 11 and is formed as a sleeve. It has a cylindrical tube section inserted in the axial direction into the recess 92 , that ends spaced apart from the rotor 22 .
- the shaft 7 is mounted on the flow divider 8 via two bearings 19 .
- the two bearings 19 are tensioned in the axial direction via the spring 21 .
- the shaft 7 can also be mounted opposite to recess 92 in the base part 2 .
- the flow divider 8 On the side of the ventilator wheel 3 , the flow divider 8 has a cup-like axial indentation 14 , in which the ventilator wheel 3 is inserted with its bottom disc. Thus, the outlet of the ventilator wheel 3 and the surface of the adjoining flow divider 8 lie flush in one axial plane.
- the diameter of the indentation 14 is equal to the external diameter of the bottom disc of the ventilator wheel 3 , so that an essentially gap-free transition is produced from the ventilator wheel 3 to the flow divider 8 .
- a minimal gap of preferably 0.2-0.5 mm is provided to ensure the rotation of the ventilator wheel 3 .
- Essentially gap-free herein means that the rotation of the ventilator wheel 3 in relation to the flow divider 8 is ensured.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A radial ventilator (1) has a base part (2), a housing part (4), with a discharge 33, placed on the base part (2), a motor electronics unit (98), and an internal rotor electric motor. The motor drives a ventilator wheel (3) via a shaft (7). The motor electronics unit (98) and a stator (32) of the electric motor are encapsulated by an extrusion coating (17) in the base part (2) and together form an integral one-piece structural unit. The radial ventilator (1) has a pressure chamber (D) enlarging in a spiral shape around the ventilator wheel (3). The pressure chamber (D) is formed and defined by the housing part (4) and the extrusion coating (17).
Description
- This application is a 371 U.S. National Phase of International Application No. PCT/EP2019/062392, filed May 14, 2019, which claims priority to German Patent Application Numbers. 10 2018 129 613.4 filed Nov. 23, 2018; 10 2018 129 611.8, filed Nov. 23, 2018 and 10 2018 129 608.8, filed Nov. 23, 2018. The entire disclosures of the above applications are incorporated herein by reference.
- The disclosure relates to a radial ventilator and, more specifically, to a high-speed radial ventilator in a compact construction.
- Radial ventilators of the type are known from the prior art, for example from German utility model DE 202018106694 U1.
- Corresponding radial ventilators include multiple housing parts to receive the motor and forming the flow path from the intake via the pressure chamber to the discharge. The flow is to be conveyed as optimally as possible from the intake to the discharge, at the same time. Good flow conditions improve the efficiency, the pressure buildup, and the acoustics of the radial fan. Radial ventilators typically have a spiral-type housing, that receives the rapid flow emitted by the radial wheel, decelerates it, and finally converts it into usable pressure. A smooth deceleration is advantageous for the pressure buildup.
- The disclosure is based on the object of providing a radial ventilator that has a compact structure with a small number of parts. At the same time, it has a high efficiency with improved acoustics.
- This object is achieved by a radial ventilator comprising: a base part, a housing part placed on the base part, a motor electronics unit and an internal rotor electric motor; a ventilator wheel drive via a shaft with electric motor; with a discharge, the motor electronics unit and a stator of the electric motor are encapsulated by extrusion coating in the base part and together form an integral one-piece structural unit; the radial ventilator has a pressure chamber expanding in a spiral shape around the ventilator wheel.
- According to the disclosure, a radial ventilator has a base part, a housing part placed on the base part with a discharge. A motor electronics unit and an internal rotor electric motor is included. The electric motor drives a ventilator wheel via a shaft. The motor electronics unit and a stator of the electric motor are encapsulated in the base part by an extrusion coating. Together they form an integral one-piece structural unit. The radial ventilator moreover has a pressure chamber expanding in a spiral shape around the ventilator wheel. It is formed and defined by the housing part and the extrusion coating.
- For example, a thermosetting plastic based on epoxy is used as the extrusion coating and processed in an injection molding. The extrusion coating forms the structure of the base part to receive the motor electronics unit and the stator. Corresponding cavities are provided for this purpose in the extrusion coating. Moreover, plug devices for electrically connecting the radial ventilator, for example a connection plug or a plug housing, can also be integrated into the extrusion coating and in particular formed on the outside on the base part.
- The one-piece design of the extrusion coating is used together with the housing part in order to provide the spiral-shaped geometry of the pressure chamber. Additional components are not required.
- In one advantageous embodiment of the radial fan, the extrusion coating comprises a protruding ring section extending in the axial direction in relation to the housing part. The axial end face defines the pressure chamber. Moreover, the ring section protrudes enough in relation to the remaining region of the base part that it provides a receptacle chamber for the motor electronics unit which is media-separated from the pressure chamber. It encloses the motor electronics components. The axial extension of the ring section and the axial end face are geometrically established so that the spiral shape of the pressure chamber is formed. Preferably, the spiral-shaped pressure chamber is created by an axial and radial expansion. The radial expansion takes place over the width of the axial end face and the axial expansion takes place over the axial height of the ring section.
- In one embodiment, the radial ventilator housing part has a constant diameter delimiting the pressure chamber. A spiral shape of the pressure chamber is exclusively defined by the extrusion coating or the protruding ring section. The structural space of the radial ventilator is particularly compact in this embodiment.
- An embodiment is also advantageous where the electric motor is arranged on a first axial side of the motor electronics unit. The pressure chamber is arranged on a second axial side of the motor electronics unit, which is opposite to the first axial side. The motor electronics unit can thus be cooled via the adjoining flow through the pressure chamber. At the same time, the motor group is separated from the flow by the motor electronics unit arranged axially in between the two.
- The motor electronics unit is preferably arranged on a printed circuit board. The printed circuit board is also completely enclosed by the extrusion coating. The fixing of the printed circuit board and the motor electronics unit or the motor electronics components arranged on the printed circuit board in the base part is carried out directly by the extrusion coating.
- In one refinement, the radial ventilator base part has a cylindrical recess around a rotational axis for the shaft, where a rotor of the electric motor fastened on the shaft is inserted. The cylindrical recess replicates a containment shroud of a containment shroud motor. The stator is positioned in the extrusion coating radially adjoining the recess. Thus, the rotor fastened on the shaft interacts with the stator when it is inserted in the recess and implements a containment shroud motor structure.
- The recess has a closed bottom. The bottom is formed by the extrusion coating. The motor is thus completely encapsulated in the base part.
- One refinement of the radial ventilator provides that a ring-shaped flow divider enclosing the ventilator wheel is arranged radially adjoining the ventilator wheel. Together with the housing part it forms a diffuser, that merges directly into the pressure chamber, around the ventilator wheel.
- For the ventilator wheel, it is important that it has a uniform counter pressure at the outlet over the entire circumference. Each blade of the ventilator wheel thus provides an optimum contribution to the flow. An uneven pressure distribution around the ventilator wheel would result in negative and undesired flow separations and back flows into the ventilator wheel. For the advantageous pressure buildup from the ventilator wheel in the pressure chamber, the flow divider is provided around the ventilator wheel. The ventilator wheel, together with the ventilator housing, provides a diffuser for the flow exiting from the ventilator wheel. It has a direct flow connection to the pressure chamber and provides a uniform counter pressure for the ventilator wheel. The radially expelled air flows through the diffuser from the radial inside to the radial outside up to its radial end and then enters the pressure chamber.
- Naturally, the entry into the pressure chamber is located radially adjoining the diffuser, however, the spiral-shaped pressure chamber itself is preferably formed axially adjoining the diffuser in an adjacent axial plane. Thus, the flow from the flow divider flows tangentially into the pressure chamber. The flow divider can extend far radially outward, so that the inflow takes place into the radial outside region of the housing part. Thus, its spiral-shaped pressure chamber and generates a defined corkscrew turbulence at the same time. Turbulence losses in the spiral-shaped pressure chamber can thus be reduced.
- In one advantageous compact interaction of the components, the flow divider rests on the extrusion coating.
- Furthermore, in one advantageous embodiment of the radial ventilator provides that the flow divider is formed as a sleeve that is inserted into the recess that replicates the containment shroud. The formation as a sleeve enables the flow divider to take over additional functions, for example mounting the shaft. Its position can be established at the same time in this way.
- It is advantageous from a fluidic viewpoint that the flow divider protrudes in the radial direction in relation to a radial inner wall surface of the extrusion coating and thus forms an axial surface of the pressure chamber. The spiral-shaped pressure chamber is located axially adjoining the diffuser. The flow divider advantageously forms a flow surface for the diffuser on a first axial side and forms an axial wall surface for the spiral-shaped pressure chamber on an opposing axial surface.
- In one embodiment, the flow divider has a cup-like axial indentation with a diameter that corresponds to an external diameter of the ventilator wheel. The ventilator wheel is inserted axially in sections into the indentation. Thus, the flow discharged by the ventilator wheel is influenced immediately by the radially adjoining section of the flow divider that forms the diffuser. The indentation enables an axially compact construction of ventilator wheel and flow divider.
- Furthermore, in one embodiment variant, the radial ventilator comprises at least one bearing for mounting the shaft. It is arranged between the flow divider and the shaft. Two axially spaced-apart bearings are preferably provided. They are tensioned via a spring and are each arranged between the flow divider and the shaft.
- The radial ventilator, in one refinement, flow divider has a rounding at least in sections on its free end facing toward the pressure chamber. In particular, the rounding is provided on a radial end of the diffuser in order to improve the tangential inflow into the pressure chamber.
- As a further embodiment variant of the radial ventilator, the axially protruding ring section of the extrusion coating has, on its radial outer edge section, a circumferential axial projection that presses against an inner wall surface of the housing part. An axial indentation in the inner part in the pressure chamber results. Thus, a sufficient contact surface between the ring section of the extrusion coating and the housing part is ensured at the same time via the circumferential projection.
- Other advantageous refinements of the disclosure are characterized in the dependent claims or are described in greater detail in the following together with the description of the preferred embodiment of the disclosure on the basis of the figures.
- The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
-
FIG. 1 is a top plan view of a radial ventilator; -
FIG. 2 is a sectional view along line B-B ofFIG. 1 ; -
FIG. 3 is a sectional view along line A-A ofFIG. 1 ; -
FIG. 4 is a perspective sectional view of the radial ventilator ofFIG. 1 . - An exemplary embodiment of a
radial ventilator 1 according to the disclosure is shown in an axial top view, two sectional views A-A and B-B, and a perspective sectional view inFIGS. 1-4 . - The
radial ventilator 1 comprises an electric motor designed as an internal rotor motor having arotor 22 and astator 32, that interact in the manner of a containment shroud motor. The magnets of therotor 22 are fastened on theshaft 7, that extends along the rotational axis RA axially through theradial ventilator 1. Theventilator wheel 3 designed as a radial ventilator wheel, is fixed on theshaft 7. In operation, theventilator wheel 3 suctions in air axially via theinlet 69 and discharges it via thepressure nozzle 33 at thedischarge 44 via its impeller blades. - The
radial ventilator 1 has thebase part 2 and the housing part 4 placed on thebase part 2 that has thepressure nozzle 33, that defines thedischarge 44. Thebase part 2 is an integral one-piece structural unit. Thestator 32 of the electric motor, the printedcircuit board 10, and themotor electronics components 98 fixed on the printedcircuit board 10 for regulating theradial ventilator 1 are encapsulated by the one-pieceplastic extrusion coating 17 of thebase part 2. Thecylindrical recess 92 is formed in thebase part 2 around the rotational axis RA of theshaft 7. Theshaft 7 and therotor 22 of the electric motor, fastened thereon, are inserted into therecess 92 in such a way that therotor 22 andstator 32 lie on one axial plane. The bottom 77 of therecess 92 is closed by theextrusion coating 17. Theextrusion coating 17 forms the protrudingring section 11 extending in the axial direction in parallel to the rotational axis. The axial end face of thering section 11, facing toward the housing part 4, defines the spiral-shaped pressure chamber D together with the housing part 4. Theaxial projection 18 is formed on the radial outside on thering section 11, which forms a contact surface to the inner wall surface of the housing part 4. The axial end face of thering section 11 is thus indented like a trough. At the same time, thering section 11 forms a receptacle chamber located on the radial inside for themotor electronics unit 98, as may be seen well inFIG. 4 . - The ring-shaped
flow divider 8 enclosing theventilator wheel 3 is arranged radially adjoining theventilator wheel 3. Theflow divider 8, together with the inner wall surface of the housing part 4, forms thediffuser 9 around theventilator wheel 3. The inner wall surface of the outer part 4 and theflow divider 8 extend radially outward perpendicularly to the rotational axis RA in the region of thediffuser 9. The free end of theflow divider 8 forms the end of thediffuser 9 and has a rounding R. Thediffuser 9 merges directly into the pressure chamber D. The spiral shape of the pressure chamber D is exclusively formed via theinner part 5 and, the housing part 4 having a constant diameter. It can be seen well with reference toFIGS. 2 to 4 that the pressure chamber D widens both axially and also radially due to the shaping of thering section 11. Theflow divider 8 protrudes in the radial direction in relation to the radialinner wall surface 87 of theinner part 5 and partially forms an upper-side axial surface of the pressure chamber D. The pressure chamber D is formed axially offset, but directly adjoining thediffuser 9. Thus, the flow generated by theventilator wheel 3 flows tangentially out of thediffuser 9 into the pressure chamber D. Thepressure nozzle 33 with thedischarge 44 is formed in one piece on the outer part 4 in extension of the pressure chamber D. Thepressure nozzle 33 has a round cross section. - The housing part 4 is sealed via a
circumferential seal 25 in relation to thebase part 2 on the radial outer wall surface of thering section 11. Furthermore, aplug device 93, for plugging in a plug and contacting with the printedcircuit board 10, is provided in one piece on thebase part 2. - The
electronics components 98 are arranged, extrusion coated by theextrusion coating 17, in the free space adjoining the pressure chamber D and thus facing toward the flow. Thus, a heat emission to theflow divider 8 and thus cooling take place. - The
flow divider 8 rests on thering section 11 and is formed as a sleeve. It has a cylindrical tube section inserted in the axial direction into therecess 92, that ends spaced apart from therotor 22. Theshaft 7 is mounted on theflow divider 8 via twobearings 19. The twobearings 19 are tensioned in the axial direction via thespring 21. Alternatively, theshaft 7 can also be mounted opposite to recess 92 in thebase part 2. In addition, it is also possible to mount one of thebearings 19 opposite to theflow divider 8 and thesecond bearing 19 opposite to thebase part 2. - On the side of the
ventilator wheel 3, theflow divider 8 has a cup-likeaxial indentation 14, in which theventilator wheel 3 is inserted with its bottom disc. Thus, the outlet of theventilator wheel 3 and the surface of the adjoiningflow divider 8 lie flush in one axial plane. The diameter of theindentation 14 is equal to the external diameter of the bottom disc of theventilator wheel 3, so that an essentially gap-free transition is produced from theventilator wheel 3 to theflow divider 8. A minimal gap of preferably 0.2-0.5 mm is provided to ensure the rotation of theventilator wheel 3. Essentially gap-free herein means that the rotation of theventilator wheel 3 in relation to theflow divider 8 is ensured. - The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Claims (17)
1.-16. (canceled)
17. A radial ventilator comprising: a base part, a housing part placed on the base part, a motor electronics unit, and an internal rotor electric motor;
a ventilator wheel drive via a shaft of the electric motor;
the motor electronics unit and a stator of the electric motor are encapsulated by an extrusion coating in the base part and together form an integral one-piece structural unit; the radial ventilator has a pressure chamber expanding in a spiral shape around the ventilator wheel, the pressure chamber is formed and defined by the housing part and the extrusion coating.
18. The radial ventilator as claimed in claim 17 , wherein the extrusion coating comprises a protruding ring section extending in the axial direction, the axial end face of the ring section defines the pressure chamber and the ring section defines a receptacle chamber for the motor electronics unit.
19. The radial ventilator as claimed in claim 17 , wherein the spiral-shaped pressure chamber is formed by an axial and radial expansion.
20. The radial ventilator as claimed in claim 17 , wherein the housing part has a constant diameter delimiting the pressure chamber and a spiral shape of the pressure chamber is exclusively defined by the extrusion coating.
21. The radial ventilator as claimed in claim 17 , wherein the electric motor is arranged on a first axial side of the motor electronics unit and the pressure chamber is arranged on a second axial side of the motor electronics unit, which is opposite to the first axial side.
22. The radial ventilator as claimed in claim 17 , wherein the motor electronics unit is arranged on a printed circuit board and the printed circuit board is enclosed by the extrusion coating.
23. The radial ventilator as claimed in claim 17 , wherein the base part has a cylindrical recess around a rotational axis for the shaft, in which a rotor of the electric motor fastened on the shaft is inserted.
24. The radial ventilator as claimed in claim 23 , wherein the recess has a closed bottom, which is formed by the extrusion coating.
25. The radial ventilator as claimed in claim 23 , wherein a ring-shaped flow divider enclosing the ventilator wheel is arranged radially adjoining the ventilator wheel, which forms a diffuser, which merges directly into the pressure chamber, together with the housing part around the ventilator wheel.
26. The radial ventilator as claimed in claim 25 , wherein the flow divider rests on the extrusion coating.
27. The radial ventilator as claimed in claim 25 , wherein the flow divider is formed as a sleeve which is inserted into the recess.
28. The radial ventilator as claimed in claim 25 , wherein the flow divider protrudes in the radial direction at least in regions in relation to a radial inner wall surface of the extrusion coating and thus forms an axial surface of the pressure chamber.
29. The radial ventilator as claimed in claim 25 , wherein the flow divider has a cup-like axial indentation, which has a diameter which essentially corresponds to an external diameter of the ventilator wheel, wherein the ventilator wheel is axially inserted in sections into the indentation.
30. The radial ventilator as claimed in claim 29 , further comprising at least one bearing for mounting the shaft, wherein the at least one bearing is arranged between the flow divider and the shaft.
31. The radial ventilator as claimed in claim 25 , wherein the flow divider has a rounding at least in sections on its free end facing toward the pressure chamber.
32. The radial ventilator as claimed in 18, wherein the axially protruding ring section of the extrusion coating has a circumferential axial projection on its radial outer edge section and presses against an inner wall surface of the housing part.
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018129613.4 | 2018-11-23 | ||
DE102018129608.8 | 2018-11-23 | ||
DE102018129611.8A DE102018129611A1 (en) | 2018-11-23 | 2018-11-23 | Rotor assembly unit with cooling function |
DE102018129611.8 | 2018-11-23 | ||
DE102018129608.8A DE102018129608B4 (en) | 2018-11-23 | 2018-11-23 | rotor assembly unit |
DE102018129613.4A DE102018129613A1 (en) | 2018-11-23 | 2018-11-23 | Radial fan with integrated cooling function |
PCT/EP2019/062392 WO2020104074A1 (en) | 2018-11-23 | 2019-05-14 | Radial ventilator |
Publications (1)
Publication Number | Publication Date |
---|---|
US20220034328A1 true US20220034328A1 (en) | 2022-02-03 |
Family
ID=67225913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/279,954 Abandoned US20220034328A1 (en) | 2018-11-23 | 2019-05-14 | Radial ventilator |
Country Status (2)
Country | Link |
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US (1) | US20220034328A1 (en) |
DE (1) | DE202019102715U1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020132757A1 (en) * | 2020-12-09 | 2022-06-09 | Connaught Electronics Ltd. | Electric fan for a temperature control device of an electronic computing device, arrangement and electronic computing device |
DE102022123442A1 (en) | 2022-09-14 | 2024-03-14 | Vaillant Gmbh | Fan for a heater and heater |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7896626B2 (en) * | 2004-03-26 | 2011-03-01 | Minebea Co., Ltd. | Electric pump |
US9115720B2 (en) * | 2012-05-04 | 2015-08-25 | Ghsp, Inc. | Dual pump and motor with control device |
US9360015B2 (en) * | 2012-07-16 | 2016-06-07 | Magna Powertrain Of America, Inc. | Submerged rotor electric water pump with structural wetsleeve |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202018106694U1 (en) | 2018-11-23 | 2018-11-30 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Rotor assembly unit |
-
2019
- 2019-05-14 DE DE202019102715.0U patent/DE202019102715U1/en active Active
- 2019-05-14 US US17/279,954 patent/US20220034328A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7896626B2 (en) * | 2004-03-26 | 2011-03-01 | Minebea Co., Ltd. | Electric pump |
US9115720B2 (en) * | 2012-05-04 | 2015-08-25 | Ghsp, Inc. | Dual pump and motor with control device |
US9360015B2 (en) * | 2012-07-16 | 2016-06-07 | Magna Powertrain Of America, Inc. | Submerged rotor electric water pump with structural wetsleeve |
Also Published As
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DE202019102715U1 (en) | 2019-05-27 |
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