U.S. patent application number 17/279954 was filed with the patent office on 2022-02-03 for radial ventilator.
The applicant listed for this patent is ebm-papst St. Georgen GmbH & Co. KG. Invention is credited to Volker EHLERS, Marcus HELLMANN.
Application Number | 20220034328 17/279954 |
Document ID | / |
Family ID | |
Filed Date | 2022-02-03 |
United States Patent
Application |
20220034328 |
Kind Code |
A1 |
EHLERS; Volker ; et
al. |
February 3, 2022 |
RADIAL VENTILATOR
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).
Inventors: |
EHLERS; Volker; (St.
Georgen, DE) ; HELLMANN; Marcus; (Unterkirnach,
DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ebm-papst St. Georgen GmbH & Co. KG |
St. Georgen |
|
DE |
|
|
Appl. No.: |
17/279954 |
Filed: |
May 14, 2019 |
PCT Filed: |
May 14, 2019 |
PCT NO: |
PCT/EP2019/062392 |
371 Date: |
March 25, 2021 |
International
Class: |
F04D 25/06 20060101
F04D025/06; H02K 5/20 20060101 H02K005/20; H02K 11/33 20060101
H02K011/33; F04D 29/42 20060101 F04D029/42; F04D 29/44 20060101
F04D029/44; F04D 29/053 20060101 F04D029/053 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 23, 2018 |
DE |
10 2018 129 608.8 |
Nov 23, 2018 |
DE |
10 2018 129 611.8 |
Nov 23, 2018 |
DE |
10 2018 129 613.4 |
Claims
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.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] 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.
FIELD
[0002] The disclosure relates to a radial ventilator and, more
specifically, to a high-speed radial ventilator in a compact
construction.
SUMMARY
[0003] Radial ventilators of the type are known from the prior art,
for example from German utility model DE 202018106694 U1.
[0004] 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.
[0005] 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.
[0006] 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.
[0007] 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.
[0008] 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.
[0009] 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.
[0010] 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.
[0011] 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.
[0012] 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.
[0013] 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.
[0014] 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.
[0015] The recess has a closed bottom. The bottom is formed by the
extrusion coating. The motor is thus completely encapsulated in the
base part.
[0016] 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.
[0017] 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.
[0018] 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.
[0019] In one advantageous compact interaction of the components,
the flow divider rests on the extrusion coating.
[0020] 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.
[0021] 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.
[0022] 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.
[0023] 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.
[0024] 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.
[0025] 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.
[0026] 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.
DRAWINGS
[0027] 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.
[0028] FIG. 1 is a top plan view of a radial ventilator;
[0029] FIG. 2 is a sectional view along line B-B of FIG. 1;
[0030] FIG. 3 is a sectional view along line A-A of FIG. 1;
[0031] FIG. 4 is a perspective sectional view of the radial
ventilator of FIG. 1.
DETAILED DESCRIPTION
[0032] 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.
DETAILED DESCRIPTION
[0033] 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.
[0034] 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. At the same
time, 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.
[0035] 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. 2 to 4 that 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. Thus, the flow
generated by the ventilator wheel 3 flows tangentially out of the
diffuser 9 into the pressure chamber D. 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.
[0036] 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.
[0037] 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.
[0038] 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. Alternatively, the shaft 7 can also be
mounted opposite to recess 92 in the base part 2. In addition, it
is also possible to mount one of the bearings 19 opposite to the
flow divider 8 and the second bearing 19 opposite to the base part
2.
[0039] 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.
[0040] 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.
* * * * *