EP2778425B1 - Double entry radial fan for an extractor hood - Google Patents

Description

The present invention relates to a double-flow radial fan for an extractor hood.

For example, is from the DE 90 16 767 U1 a double-flow centrifugal fan for a cooker hood known. The radial fan includes a spiral housing, a fan, a blower motor and an engine mount. The fan is accommodated in the housing. The blower motor drives the fan wheel. The fan motor is supported within the fan by means of the engine mount.

US 2004/0253098 A1 describes a ventilation unit for a heating system, a ventilation system and an air conditioning system, which has a housing in which a radial fan is arranged, which is driven by an electric motor.

An object of the present invention is to allow the simplest possible installation of a double-flow radial fan for a cooker hood.

Accordingly, there is provided a double-flow radial blower for an extractor hood having a spiral housing, a fan wheel, a blower motor, and an engine mount. The spiral housing has two detachably connected housing halves, each comprising an air outlet. The fan is accommodated in the housing. The blower motor drives the fan wheel. The engine mount supports the blower motor inside the fan. The engine mount supports the blower motor only on one half of the housing, with the engine mount flanged to an edge defining an air inlet thereof.

The radial fan thus formed is easy to install: First, the fan motor is connected to the engine mount. After this, the engine mount together with the blower motor is attached to a first housing half, wherein the engine mount is flanged to the edge. Thereafter, the fan is rotatably connected to the fan motor. Subsequently, a second housing half of the housing is releasably connected to the first housing half.

The spiral housing has a tangential air outlet. The fan delivers air from the two axial air inlets to the tangential air outlet. The axial air inlets are opposite. The air inlets may be formed circular, wherein a central axis thereof coincides with the axis of rotation of the fan motor. "Axial", "radial", "tangential" and "circumferentially" herein refers to an axis of rotation of the fan motor.

The blower motor can be designed as an electronically commutated electric motor, which is also referred to as a brushless DC motor (BLDC) or EC motor. The blower motor comprises a stator and a rotor. The rotor can be designed as an internal rotor. The rotor preferably comprises a shaft which drives the fan wheel.

"Only on one half of the housing" means that the engine mount is not supported on any other part, in particular not on the other half of the housing.

According to one embodiment, at least one screw is provided for flanging the engine mount to the rim. The at least one screw can connect a support arm of the engine mount with the edge. According to one embodiment, exactly three screws can be provided, wherein a respective screw connects a respective support arm with the edge. The at least one screw can be screwed directly into the material of the housing half. "Direct" means that no other material, in particular no bush, is provided between the thread of the screw and the housing half.

Furthermore, attachment points for the flanging of the engine mount are arranged asymmetrically at the edge. The engine mount can thus be flanged in only one predetermined orientation at the attachment points. Thus, this can not be accidentally mounted in the wrong orientation. By "asymmetrical" is meant that no axis of symmetry can be found through the axis of rotation of the fan motor, with respect to which the attachment points are symmetrical to each other.

According to a further embodiment, the fastening points in the circumferential direction are spaced differently far from each other. The attachment points are therefore arranged on a circular line. This results in the asymmetrical arrangement of the attachment points in a simple manner. Accordingly, then support arms of the engine mount can be designed asymmetrically.

According to a further embodiment, the edge for the flanging of the engine mount on at least one mounting aid. This allows the engine mount to be easily mounted on the edge. For example, the mounting aid may be in the form of geometries corresponding to the engine mount.

According to a further embodiment, the mounting aid is provided in the form of a semicircular web which is adapted to receive one end of a support arm of the engine mount. Accordingly, the web and the end of the support arm form corresponding geometries which are engaged with each other so as to facilitate the positioning of the engine mount. For example, by the interaction of the end of the support arm and the web, an unintentional rotation of the engine mount about the axis of rotation can be prevented. For example, the web may be formed as a stiffening rib stiffening the edge.

According to a further embodiment, the web surrounds a screw hole for the at least one screw. For example, the screw hole can be arranged on the chord of the semicircle which the web describes.

According to a further embodiment, a shaft of the fan motor is screwed by means of a threaded portion thereof with the fan wheel. In particular, the fan may be bolted to the shaft in the opposite direction to the direction of rotation of the shaft for driving the fan during operation of the radial fan. Thus, the thread is tightened during operation of the radial fan increasingly or a release can be safely avoided. In the fan may be inserted a threaded bush into which the threaded portion is screwed. The threaded bush, for example, can be extrusion-coated with the material forming the fan wheel or positively or non-positively connected.

According to a further embodiment, a shaft of the fan motor has a centering section, which engages in a corresponding centering section of the fan motor. Thus, the fan wheel centered automatically with the sliding of the same on the shaft.

According to a further embodiment, the threaded portion is arranged at one end of the shaft. The centering section preferably connects directly to the threaded section. As a result, the centering and screwing can take place in one step.

According to a further embodiment, the two housing halves are releasably connected together along a rotational axis of the fan motor. The fact that two separate housing halves are provided, they can each be made in a simple tool, for example by injection molding. Due to the detachable connection of the housing halves they can be separated from each other for maintenance purposes, so as to release access to the fan. The fan wheel can also be easily inserted between two housing halves.

According to a further embodiment, at least one clip is provided for releasably connecting the two housing halves. However, a connection by means of a snap mechanism is also possible instead of the clip. As a snap mechanism, for example, an elastic hook may be provided, which is first deformed elastically when connecting the housing halves and hereafter snapped behind a catch, wherein the hook is arranged on one housing half and the detent on the other housing half.

According to a further embodiment, the housing halves have at least one pair of centering geometries corresponding to one another. For example, the one half of the housing may have a pin and the other half of the housing a hole corresponding to the pin. By telescoping pin and hole the housing halves are centered to each other. The pin may also be conical and / or chamfered to facilitate insertion into the hole. Furthermore, the pair of corresponding Zentriergeometrien groove and have. Thus, for example, an edge of a housing half comprise a circumferential groove, while the other housing half comprises a circumferential spring. By axial telescoping tongue and groove are brought into engagement.

According to a further embodiment, the engine mounting is designed in the form of a bearing plate which has a first holder for a bearing of a shaft of a rotor of the fan motor, a second holder for a stator of the fan motor and a plurality Has support arms, which are each flanged at their ends to the edge. For example, exactly three support arms can be provided. The engine mount thus has a dual function: on the one hand, it holds the engine within the fan and on the other hand, it forms the support of the stator and rotor to each other. The support arms, the first holder and the second holder may be integrally formed with each other. For example, the engine mount may be made as a diecast part, in particular made of aluminum.

Furthermore, an extractor hood is provided with the above-described double-flow radial fan.

Furthermore, a method for mounting a double-flow radial blower, in particular the radial blower described above, is provided. This includes the steps of: connecting a fan motor to an engine mount, attaching the engine mount to a first housing half of a housing, flanging the engine mount to an edge defining an air inlet of the first housing half, connecting a fan wheel to the blower motor and connecting a second housing half thereof Housing with the first housing half.

This results in a simple assembly process. The order of the above-mentioned designated steps can be varied.

Further possible implementations of the invention also include not explicitly mentioned combinations of features or embodiments of the double-flow radial blower, the extractor hood or of the method described above or below with regard to the exemplary embodiments. The skilled person will also add or modify individual aspects as improvements or additions to the respective basic form of the invention.

Further advantageous embodiments and aspects of the invention are the subject of the dependent claims and the embodiments of the invention described below. Furthermore, the invention will be explained in more detail by means of preferred embodiments with reference to the attached figures.

• Fig. 1: in einer perspektivischen Ansicht ausschnittsweise eine Dunstabzugshaube gemäß einer Ausführungsform;
• Fig. 2: in einer perspektivischen Ansicht ein Gehäuse der Dunstabzugshaube aus Fig. 1;
• Fig. 3: eine vergrößerte Ansicht aus Fig. 1;
• Fig. 4: in einem Schnitt die Befestigung einer Welle an einem Lüfterrad aus Fig. 1;
• Fig. 5: das Radialgebläse aus Fig. 1 bei der Montage;
• Fig. 6: ausschnittsweise die Gehäusehälften aus Fig. 5 in einem miteinander verbundenen Zustand; und
• Fig. 7: ein Ablaufdiagramm einer Montage des Radialgebläses aus Fig. 1.

It shows:

• Fig. 1 in a perspective view of a partial extractor hood according to an embodiment;
• Fig. 2 : In a perspective view of a housing of the hood Fig. 1 ;
• Fig. 3 : an enlarged view Fig. 1 ;
• Fig. 4 : in a section, the attachment of a shaft on a fan Fig. 1 ;
• Fig. 5 : the radial fan off Fig. 1 during installation;
• Fig. 6 : Partially out of the housing halves Fig. 5 in an interconnected state; and
• Fig. 7 a flow diagram of a mounting of the radial fan from Fig. 1 ,

In the figures, the same reference numerals designate the same or functionally identical components, unless stated otherwise.

FIG. 1 shows in a perspective view a detail of an extractor hood 1 with a double-flow radial fan. 2

The radial fan 2 comprises a spiral-shaped housing 3, which is composed of a first and a second housing half 4, 5.

FIG. 2 shows in a perspective view of the housing 3 from FIG. 1 without the others in FIG. 1 shown components.

In FIG. 2 It can also be seen that the first housing half 4 has an air inlet 6 and the second housing half 5 has an air inlet 7. The air inlets 6, 7 are directly opposite. The air inlets 6, 7 are each formed circular and have the same central axis 11. The central axis 11 is coaxial with a rotation axis 12 of an in FIG. 1 shown fan 13 arranged. Consequently, the air inlets 6, 7 are axially oriented. The air inlets 6, 7 are each bounded by a radial edge 14. In FIG. 2 only one edge 14 is shown. The other edge is in FIG. 2 covered. The edge 14 forms an end face of a cylinder with a spiral base on which the shape of the housing 3 is based. The edges 14 are connected to each other via an axial circumferential surface 15. The lateral surface 15 is composed of a first jacket section 16, which is assigned to the first housing half 4, and a second jacket section 17, which is assigned to the second housing half 5. The shell sections 16, 17 and thus the two housing halves 4, 5 can by means of a tongue and groove joint 21 in the axial direction (relative to the central axis 11 and the axis of rotation 12) engage with each other. The tongue and groove connection 21 may be secured by brackets. Such a bracket 22 is exemplified in FIG Fig. 6 shown. The bracket 22 engages at its opposite ends 40 in the first and second housing half 4, 5. The brackets 22 can also be solved again, so that a detachable connection of the two housing halves 4, 5 is achieved with each other.

Now returning to FIG. 2 is further shown that the housing 3 has a radial air outlet 23. This in FIG. 1 shown impeller 13 conveys air from the axial air inlets 6, 7 to the air outlet 23, wherein the air is deflected and subjected to a pressure difference.

The edge 14 is formed with attachment points 24 in the form of screw holes. These are arranged directly adjacent to the air inlet 6. The air inlet 7 does not have the attachment points 24, since no attachment takes place on this. The fastening points 24 are spaced apart from one another in the circumferential direction 25 (relative to the center axis 11 or the rotation axis 12), so that they are symmetrical with respect to any radials 26.

Each of the attachment points 24 is surrounded by a semicircular stiffening rib 27 which is open towards the air inlet 6. The stiffening rib 27 serves as an assembly aid for a in FIG. 1 shown engine mount 31st

The engine mount 31 comprises a first holder 32 in the form of a bearing cup for holding a hidden and therefore provided with a dashed line with reference numerals Bearing 33. In the bearing 33, a shaft 34 of a rotor 35 is mounted. The rotor 35 is part of a blower motor 36 in the form of an electronically commutated motor.

The engine mount 31 further includes a second bracket 37 which rotatably holds a stator 41 of the fan motor 36. The rotor 35 is designed as an internal rotor.

The engine mount 31 further comprises exactly three support arms 42, each having a hole and a corresponding screw 43 at the attachment points 24 (see FIG. 2 ) are flanged. The engine mount 31 is thus fastened exclusively to the housing half 4. The support arms 42 curve inwardly into the fan 13, so that the fan motor 36, in particular the rotor 35 and the stator 41, in the axial direction, ie along the axis of rotation 12 is disposed within the fan 13. In addition, the blower motor 36 is disposed concentrically within the air inlet 6. The engine mount 31, in particular the first holder 32, the second holder 37 and the support arms 42, is integrally formed, for example, in the form of an aluminum die-cast part.

An end 40 of a respective support arm 42 axially engages in a mounting of the engine mount 31 axially into a respective mounting aid 27 axially. Accidental rotation of the engine mount in the circumferential direction 25 is prevented. In addition, the asymmetrical arrangement of the attachment points 24 causes the engine mount 31 to be mounted in only one orientation relative to the housing 3. Because only in the desired positioning screw holes cover 44 (dashed in FIG. 1 because hidden) of the support arms 42 with the screw holes 24 in the edge 14. Then, the screws 43 can be screwed through the two screw holes 44 and 24. This is also in FIG. 3 to recognize which is an enlarged view FIG. 1 shows.

FIG. 4 shows in a section the attachment of the shaft 34 of the blower motor 36 to a bell 45 of the fan wheel 13. The shaft 34 has at its end 46 a threaded portion 47, to which a centering 51 connects directly. The centering portion 51 corresponds to a centering portion 52 of the fan wheel 13. In the fan 13, a bush 53 may be used, in which the threaded portion 47 of the shaft 34 is screwed. The centering portion 52 may also be on the socket 53rd be educated. Thus, automatically centering of the fan 13 with respect to the shaft 34 when sliding the centering 52 on the centering 51 when screwing the threaded portion 47. The screwing of the fan 13 takes place in a direction opposite to the direction of rotation 57 of the fan 13 (s. Fig. 1 ) during operation of the radial fan 2 instead. The connection between the bushing 53 and the bell 45 of the fan wheel 13 can be achieved by molding the bushing 53 or a non-positive and / or positive connection.

At the beginning of assembly of the radial fan 2, the blower motor 36 is attached to the engine mount 31 in a step 701 (see FIG. Fig. 7 ), wherein in particular the rotor 35 is mounted in the bearing 33 and the stator 41 is attached to the second holder 37. After that, the engine mount 31 is flanged at the edge 14 of the housing half 4 by means of the screws 43 in a step 702. The shaft 34 of the blower motor 36 is in a step 703 with the fan 13 on in connection with FIG. 4 connected manner described. FIG. 5 shows a perspective view of an assembly of the two housing halves 4 and 5 according to a step 704th

In FIG. 5 In particular, it is shown that in addition to the tongue and groove connection 21, a further pair of corresponding Zentriergeometrien in the form of a pin 55, which cooperates with a hole 56 may be provided. In this case, for example, the hole 56 is arranged on the housing half 4 and the pin 55 on the housing half 5 and can be axially brought into engagement with each other. The hole 56 is shown in dashed lines, the in FIG. 5 is covered. The pin 55 may be formed chamfered to the housing half 4 or rounded to facilitate insertion into the hole 56.

By axial connection of the two housing halves 4, 5 by an axial in engaging the tongue and groove joint 21 and the pin-hole connection 55, 56 and final clamping of the two housing halves 4, 5 by means of the brackets 22 with each other, the fan 13 and the blower motor 36 is positioned inside the housing 3.

1

Dunstabzugshaube

2

Radialgebläse

3

Gehäuse

4

Gehäusehälfte

5

Gehäusehälfte

6

Lufteinlass

7

Lufteinlass

11

Mittelachse

12

Drehachse

13

Lüfterrad

14

Rand

15

Mantelfläche

16

Mantelabschnitt

17

Mantelabschnitt

21

Nut-Feder-Verbindung

22

Klammer

23

Luftauslass

24

Befestigungsstelle

25

Umfangsrichtung

26

Radiale

27

Rippe

31

Motoraufhängung

32

erste Halterung

33

Lager

34

Welle

35

Rotor

36

Gebläsemotor

37

zweite Halterung

40

Ende

41

Stator

42

Tragarm

43

Schraube

44

Schraubenloch

45

Glocke

46

Ende

47

Gewindeabschnitt

51

Zentrierabschnitt

52

Zentrierabschnitt

53

Buchse

55

Zapfen

56

Loch

57

Drehrichtung

Although the invention has been described herein with reference to preferred embodiments, it is not limited thereto, but variously modifiable.
Used reference signs:

1

Hood

2

centrifugal blower

3

casing

4

housing half

5

housing half

6

air intake

7

air intake

11

central axis

12

axis of rotation

13

fan

14

edge

15

lateral surface

16

shell section

17

shell section

21

Tongue and groove

22

clip

23

air outlet

24

fastening point

25

circumferentially

26

radial

27

rib

31

engine Mounts

32

first bracket

33

camp

34

wave

35

rotor

36

blower motor

37

second bracket

40

The End

41

stator

42

Beam

43

screw

44

screw hole

45

Bell jar

46

The End

47

threaded portion

51

centering

52

centering

53

Rifle

55

spigot

56

hole

57

direction of rotation

Claims (14)

1. Double entry radial fan (2) for an extractor hood (1), with a spiral-shaped housing (3), which has two housing halves (4, 5) connected to one another in a detachable manner, which each comprise an air inlet (6, 7), a fan wheel (13), which is accommodated in the housing (3), a fan motor (36), which drives the fan wheel (13), and a motor suspension (31), which retains the fan motor (36) within the fan wheel (13), wherein the motor suspension (31) retains the fan motor (36) exclusively on one housing half (4) and is flanged on an edge (14) delimiting an air inlet (6) of the same, characterised in that the fastening points (24) for the flanging of the motor suspension (31) on the edge (14) are arranged asymmetrically.
2. Double entry radial fan according to claim 1, characterised in that there is provision for at least one screw (43) for the flanging of motor suspension (31) on the edge (14).
3. Double entry radial fan according to claim 1, characterised in that the fastening points (24) are spaced apart from each other at differing distances in the circumferential direction (25).
4. Double entry radial fan according to one of claims 1 - 3, characterised in that the edge (14) for the flanging of the motor suspension (31) has at least one assembly aid (27).
5. Double entry radial fan according to claim 4, characterised in that the assembly aid (27) is provided in the form of a semicircular projection, which is embodied to accommodate an end (40) of a support arm (42) of the motor suspension (31).
6. Double entry radial fan according to claim 5, characterised in that the projection (27) surrounds a screw hole (24) for the at least one screw (43).
7. Double entry radial fan according to one of claims 1 - 6, characterised in that a shaft (34) of the fan motor (36) is screwed to the fan wheel (13) by means of a threaded section (47) of the fan motor (36).
8. Double entry radial fan according to one of claims 1 - 7, characterised in that a shaft (34) of the fan motor (36) has a centring section (51), which engages into a corresponding centring section (52) of the fan wheel (13).
9. Double entry radial fan according to claim 8, characterised in that the threaded section (47) is arranged on an end (46) of the shaft (34) and the centring section (51) attaches thereto.
10. Double entry radial fan according to one of claims 1 - 9, characterised in that the two housing halves (4, 5) are connected to one another in a detachable manner along an axis of rotation (12) of the fan motor (36).
11. Double entry radial fan according to claim 10, characterised in that at least one clamp (22) is provided for the detachable connection of the two housing halves (4, 5).
12. Double entry radial fan according to one of claims 1 - 11, characterised in that the two housing halves (4, 5) have at least one pair of centring geometries (21, 55, 56) corresponding to one another.
13. Extractor hood (1) with a double entry radial fan according to one of claims 1 - 12.
14. Method for the assembly of a double entry radial fan (2) according to one of claims 1 - 12, having the steps:

    Connection (701) of a fan motor (36) to a motor suspension (31),

    Fastening (702) of the motor suspension (31) to a first housing half (4) of a housing (3), wherein the motor suspension (31) is flanged on an edge (14) delimiting an air inlet (6) of the first housing half (4) and fastening points (24) for the flanging of the motor suspension (31) on the edge are arranged asymmetrically,

    Rotationally-fixed connection (703) of a fan wheel (13) to the fan motor (36), and

    Connection (704) of a second housing half (5) of the housing (3) to the first housing half (4).

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