EP2971788B1 - Bearing shield for a blower motor of a radial fan of a range hood - Google Patents

Description

The present invention relates to a bearing plate for a blower motor of a radial fan of an extractor hood.

For example, this describes DE 90 16 767 U1 an extractor hood with a radial fan. The radial fan comprises a housing and a blower motor. The blower motor is held on the housing by means of a motor suspension. The engine mounting comprises three arms, which are each flanged to the housing. The arms extend from their respective attachment portion on the housing into a fan wheel which surrounds the fan motor. A respective arm is composed of an axial and a radial section. By means of the radial portion, the attachment to the housing. At the axial portion of a stator of the fan motor is concentrically mounted in the fan. The attachment of the engine mount on the stator via an in FIG. 1 shown annular portion of the engine mount, at which join the axial sections respectively.

EP 408 221 A2 describes a further extractor hood with a radial fan.

It is an object of the present invention to provide an approach whereby fewer components are needed to suspend a blower motor on a radial blower for an extractor hood while minimizing obstruction of an air inlet of the radial blower.

Accordingly, a bearing plate for a blower motor of a radial fan of an extractor hood is provided with a first holder, a second holder and a plurality of support arms. The first holder is adapted to support a bearing for a shaft of a rotor of the fan motor. The second holder is adapted to support on one side thereof in the axial direction a stator of the fan motor. The support arms close in the axial direction to the other side of the second holder and are adapted to attach the end shield to a housing of the radial fan such that the rotor and stator of the fan motor entirely within a provided by the fan motor and provided in the housing Fan are arranged. The first holder, the second holder and the support arms are integrally formed with each other.

Thus, there is the advantage that the bearing plate by means of the first and second brackets the rotor and stator of the fan motor positioned to each other and at the same time provides the suspension of the fan motor within the fan. The bearing plate thus has a double function. Furthermore, the end plate is easy to produce, for example as a diecast part. Furthermore, the bearing plate obstructs the corresponding air inlet of the radial blower only slightly, since it positions the blower motor inside the fan wheel.

The blower motor is designed as an electric motor and can be provided as an electrically commutated motor, which is also referred to as a brushless DC motor (BLDC) or EC motor. The rotor of the fan motor can be designed as an internal rotor.

The radial fan can be designed as a double-flow radial fan.

The housing may be formed as a spiral housing, in particular doppelflutiges spiral housing.

The extractor hood can be designed for use in the home, especially in kitchens above cooking zones. Accordingly, it is at the hood to a household appliance.

The first support for the bearing may be in the form of a sleeve or a pot which receives the bearing.

The stator of the fan motor may be provided fastened to the second holder, in particular by means of screws.

"Axial", "radial", "tangential" and "in the circumferential direction" in the present case always refers to a rotational axis of the shaft of the rotor of the fan motor defined by the first holder.

Thus, that the support arms in the axial direction to the other side, it is meant that they extend with at least a portion thereof at an angle of <45 °, preferably <20 ° to the axial.

So that "the rotor and stator of the fan motor are arranged entirely within" the fan, it is meant that the rotor and stator are arranged axially, ie in the width direction of the fan wheel, and radially inside thereof. In particular, the fan motor can be arranged concentrically in the fan wheel.

According to one embodiment, at least one support arm has a radial section for flanging the endshield to the housing and an axial section for reaching into the fan wheel. As a result, the end shield can be easily attached to the housing, and the fan motor can be easily positioned. The radial section does not have to extend exactly in the radial direction, but may deviate slightly therefrom, for example by up to 10 ° or up to 5 °. Also, the axial portion does not have to extend exactly in the axial direction, but may differ from this example by up to 45 °, preferably up to 20 °, as explained in more detail below.

According to a further embodiment, an axial portion of at least one support arm is tilted in the radial direction with respect to the axial direction. For example, the axial section may be tilted by up to 20 °, preferably up to 10 ° and more preferably up to 5 ° with respect to the axial direction. This results in that the axial sections do not run parallel to blades of the fan. As a result, resonances between stationary parts (in this case the bearing plate) and rotating parts (in this case, the fan wheel) can be avoided. Because a pressure surge does not form periodically over the entire length of the support arm or the blade, but migrates along the support arm or the corresponding blade along. This leads to a significantly lower noise due to so-called "blade passing frequencies" and their harmonics.

According to a further embodiment, an axial portion of at least one support arm is tilted in the tangential direction with respect to an axial plane. An "axial plane" is to be understood as meaning a plane in which the axial or the bearing axis of rotation lies. Even by these measures resonances can be further avoided. Further, the tilt of the axial portion in the tangential direction may be such that sucked air is guided in the direction of rotation of the fan along the axial portion. This can ensure that swirling or circulating currents in the fan are not pushed out of the fan again when they hit a support arm of the bearing plate, but are pressed into the fan.

According to a further embodiment, fastening points for fastening the support arms to the housing in the circumferential direction at different distances from each other. This results in an asymmetrical arrangement of attachment points. Thus, resonances can be further reduced. The two attachment points of the bearing plate, which have the greatest distance from each other in the circumferential direction, can span an air outlet of the housing. The fan is flowed through near the outlet at the strongest. Due to the large distance of the support arms in this area, the outlet is thus blocked as little as possible and influencing the flow is minimal. The attachment points may each have a mounting hole for a screw for flanging on the housing.

According to another embodiment, exactly three support arms are provided. This represents a good compromise in terms of stability and obstruction of the air intake.

According to another embodiment, an angle between a first and a second attachment point between 105 ° and 115 °, between the second and a third attachment point between 115 ° and 125 ° and between the third and first attachment point between 125 ° and 135 °. The angle of between 125 ° and 135 ° is preferably arranged opposite the air outlet of the housing.

According to a further embodiment, attachment points of the support arms on the second support in the circumferential direction are uniformly spaced. This results in a high stability for the end shield. For example, the connection points may have a spacing of 120 ° in the circumferential direction to each other.

According to a further embodiment, a respective axial portion of a support arm continues in an axial support web of the second support. A respective axial portion and a respective holding web are thus formed in one piece. This results in a simple structure as well as a simple production.

According to a further embodiment, the axial holding portions are connected via a respective radial holding arm of the first holder. Preferably, exactly three radial holding arms are provided, to which exactly one axial holding section connects. The radial holding arms may extend in a star shape away from the first holder.

According to a further embodiment, at least one of the support arms has an S-shaped cross-section. In particular, the axial portion may have such an S-shaped cross-section. Also by this measure, twisted or circulating air in the fan wheel is pushed back into this when it hits the support arm. For this purpose, the S-shaped cross section is arranged such that it forms a ramp for circulating air in the direction towards the axis of rotation.

Furthermore, an extractor hood is provided with a radial fan which comprises a fan motor, a fan wheel driven by the fan motor, a housing in which the fan wheel is arranged, and a bearing plate described above. The bearing plate is fastened by means of its support arms to the housing. The end shield holds the stator and rotor of the fan motor entirely inside the fan.

According to one embodiment, an axial section of at least one support arm for guiding sucked air into the fan wheel is tilted. As a result, twisted or circulating air in the fan is pressed back into this.

According to a further embodiment, an axial portion of at least one support arm is tilted in the direction of rotation of the fan wheel during operation of the radial fan. In this way, air can be easily guided into the fan or twisted or circulating air is held in the fan.

According to a further embodiment, the two fastening points of the bearing plate on the housing span an air outlet of the same, which have the greatest distance in the circumferential direction to one another. In other words, the asymmetry of the attachment points is chosen so that an angle division in the region of the air outlet is greatest.

Further possible implementations of the invention also include not explicitly mentioned combinations of features or embodiments of the end shield or the extractor hood 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: einen Teilschnitt aus Fig. 1 in einer axialen Ebene;
• Fig. 3: den Lagerschild aus Fig. 1 in einer Seitenansicht;
• Fig. 4: den Lagerschild aus Fig. 3 in einer Draufsicht;
• Fig. 5: einen Schnitt V-V aus Fig. 3; und
• Fig. 6: einen Schnitt VI-VI aus Fig. 4.

It shows:

• Fig. 1 in a perspective view of a partial extractor hood according to an embodiment;
• Fig. 2 : a partial cut out Fig. 1 in an axial plane;
• Fig. 3 : the end shield Fig. 1 in a side view;
• Fig. 4 : the end shield Fig. 3 in a plan view;
• Fig. 5 : a cut VV off Fig. 3 ; and
• Fig. 6 : a cut VI-VI off Fig. 4 ,

In the figures, the same or functionally identical elements have been given the same reference numerals, 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 fan motor 3 in the form of an electronically commutated motor. Furthermore, the radial fan 2 has a fan 4 driven by the fan motor 3. The blower motor 3 drives the fan 4 about a rotation axis 5. Blades 6 of the fan 4 extend axially (ie parallel to the axis of rotation 5). As far as the present case of "axial", "radial", "tangential" or "circumferentially" is spoken, this always refers to the axis of rotation 5. Furthermore, the radial fan 2 includes a housing 7. The housing 7 has two axial air inlets eleventh on. FIG. 1 shows only one of the air inlets 11, since the other air inlet is covered. In addition, the housing 7 comprises a tangential air outlet 12. The fan 4 sucks in the operation of the radial fan 2 air air inlet side and ejects these air outlet side. In the housing 7, the fan 4 is arranged and within the fan 4, in turn, the fan motor 3 is arranged concentrically with respect to the axis of rotation 5. A first end shield 13 positions the blower motor 3 with respect to the housing 7.

As in FIG. 2 to recognize which an axial partial section FIG. 1 shows the bearing plate 13 a rotor 14 and a stator 15 of the fan motor 3 in the axial direction 16 (ie along the axis of rotation 5) within the fan 4.

As in further FIG. 2 shown, the bearing plate 13 has a first holder 17 in the form of a storage pot. The first holder 17 receives a bearing 21 in the form of a roller bearing. By means of the bearing 21, a shaft 22 of the rotor 14 is rotatably held relative to the end plate 13. Opposite the first bearing plate 13, a second bearing plate 23 is arranged, which supports the shaft 22 by means of a bearing 24 in the form of a roller bearing. An attachment portion 25, for example in the form of a thread of the shaft 22 protrudes from the end plate 23 and is rotatably connected to a bell 26 of the fan 4. The bell 26 may be configured to divide the fan 4 into two fluidically separate regions, one communicating with the one air inlet 11 and the other region communicating with the other air inlet.

FIG. 2 further shows that the bearing plate 13 has a second holder 27, which receives on its one side 31, the stator 15 in the axial direction 16. Alternatively, the stator 15 may be held on the second support 27, but without reaching into it. The end shields 13, 23 take the rotor 14 and the stator 15 between them. For this purpose, the second bearing plate 23 is attached to the first bearing plate 13, for example by means of axial screws 32.

The structure of the end plate 13 will be described below with reference to FIGS. 3 to 6 explained in more detail.

The bearing plate 13 includes several, for example, exactly three support arms. A first support arm is denoted by 33, a second support arm by 34 and a third support arm by 35. The support arms 33, 34, 35 connect on the other side 36 of the second holder 27 in the axial direction 16 to the second holder 27 at.

A respective support arm 33, 34, 35 comprises a radial section 37 and an axial section 41. By means of the radial section 37, a respective support arm 33, 34, 35 is flanged to an edge region 42 of the housing 7 surrounding the air inlet 11. For this purpose, the radial sections 37 each have a mounting hole 43, as in FIG. 4 shown. By means of in FIG. 1 shown screws 44 which are passed through the mounting holes 43, the radial portions 37 are screwed to the edge portion 42. The radial sections 37 extend in the radial direction 45, ie perpendicular to the axial direction 16, but deviations from the radial direction 45 are encompassed by, for example, up to 5 °. The axial sections 41 connect the radial sections 37 in each case via a curved section 46 with the second holder 27. The axial sections 41 extend in principle in the axial direction 16, but may differ from this in different ways, as will be explained in more detail below.

In the Figures 3 and 4 It can be seen that the axial portions 41 of each support arm 33, 34, 35 are tilted in the radial direction 45 relative to the axial direction 16. Thus, a respective axial portion 41 in particular form an angle 47 of, for example, 5 ° with the axial direction 16. Furthermore, for example, one of the support arms (exemplified in the figures for the support arm 35, but the same way for the other support arms 33, 34 conceivable) with its axial portion 41 in the tangential direction 51 with respect to an axial plane 52 tilted (see Fig. 4 ). For example, the axial portion 41 of the support arm 35 may form an angle 53 of 15 ° with the axial plane 52.

Both by the tilting in the radial direction as well as the tilting in the tangential direction, it follows that the axial portions 41 are not parallel to the blades 6 of the fan 4 (see FIGS. 1 and 2 ). This is favorable in terms of resonances.

Furthermore, the support arms 33, 34, 35 are designed such that the mounting holes 43 are spaced apart in the circumferential direction 54 different far from each other, as in Fig. 4 to recognize. Thus, an angle 55 between the attachment point 43 of the first support arm 33 and the attachment point 43 of the second support arm 34 may be for example 120 °. An angle 56 between the attachment hole 43 of the second support arm 34 and the attachment hole 43 of the third support arm 35 may be 130 °. Accordingly, an angle 57 between the attachment point 43 of the third support arm 35 and the attachment point 43 of the first support arm 33 is 110 °. To the air outlet 12 (see FIG. 1 ) As little as possible to block the brackets 34 and 35, which have the largest angle 56 between them, this span.

However, as in FIG. 5 can be seen, connecting points 61 of the support arms 33, 34, 35 on the second bracket 27 in the circumferential direction 54 evenly spaced from each other. Accordingly, an angle 62 between each two attachment points 61 is 120 °. The attachment points 61 may be formed at ends of radial arms 63 of the second support 27. The radial arms 63 are star-shaped from the first bracket 17. This is also in FIG. 6 to recognize. Next is in FIG. 6 illustrated that the axial portion 41 of the support arm 33 continues in an axial holding web 64 of the second holder 27. This applies to the support arms 34 and 35 accordingly. The retaining bar 64 may be formed with an axial bore 65 into which the screw 32 (see FIG. 2 ) is screwed.

As further in FIG. 6 to recognize the bearing plate 13 is formed as a one-piece component. In particular, the bearing plate 13 in a die-casting process, for example Be made of steel or metal. Also, a manufacture of the bearing plate 13 by forming is conceivable. The one-piece construction relates in particular to the first and second holders 17, 27 and the support arms 33, 34, 35.

Returning to FIG. 5 , It is shown there that the axial portions 41 of the support arms 33, 34, 35 each have an S-shaped cross-section 66. The S-shaped cross-section 66 is oriented such that a ramp 67 is formed, which air 71, which impinges on the support arms 33, 34, 35, in particular those air 71 in the fan 4 (see FIG. 1 ) is twisted or runs in a circle, is pushed back radially into the fan 4. Correspondingly, the tangentially tilted axial section 41 of the third support arm 35 ensures that twisted or circular air 72 flows along it, ie in a generally axial direction (see also FIG FIG. 5 , in which, unlike FIG. 3 it can be seen that the air 72 flows behind the axial section 41) continues to flow into the fan 4 and does not flow out in the direction of the air inlet 11. The direction of rotation of the fan 4 is in the FIGS. 1 and 5 denoted by 73. Accordingly, the air flowing in the circle in the fan 4 also rotates.

Used reference signs:

1

Hood

2

centrifugal blower

3

blower motor

4

fan

5

axis of rotation

6

shovel

7

casing

11

air intake

12

air outlet

13

end shield

14

rotor

15

stator

16

axial direction

17

first bracket

21

warehouse

22

wave

23

end shield

24

warehouse

25

attachment section

26

Bell jar

27

second bracket

31

page

32

screw

33

support arm

34

support arm

35

support arm

36

page

37

radial section

41

axial section

42

border area

43

mounting hole

44

screw

45

radial direction

46

curved section

47

corner

51

tangential direction

52

axial plane

53

corner

54

circumferentially

55

corner

56

corner

57

corner

61

connecting point

62

corner

63

poor

64

holding web

65

drilling

66

S-shaped cross section

67

ramp

71

air

72

air

73

direction of rotation

Claims (15)

1. Bearing shield (13) for a blower motor (3) of a radial fan (2) of a range hood (1), having a first mount (17) which is designed to hold a bearing (21) for a shaft (22) of a rotor (14) of the blower motor (3), having a second mount (27) which is designed to hold a stator (15) of the blower motor (3) on one side (31) of said mount in the axial direction (16), and having a plurality of support arms (33, 34, 35) which in the axial direction (16) abut the other side (36) of the second mount (27) and are designed to fasten the bearing shield (13) to a housing (7) of the radial fan (2) such that the rotor (14) and stator (15) of the blower motor (3) are arranged entirely inside a fan wheel (4) that is driven by the fan motor (3) and provided in the housing (7), wherein the first mount (17), the second mount (27) and the support arms (33, 34, 35) are formed integrally with one another.
2. Bearing shield according to claim 1, characterised in that at least one support arm (33, 34, 35) has a radial section (37) for flange-mounting the bearing plate (13) on the housing (7) and an axial section (41) for extending into the fan wheel (4).
3. Bearing shield according to claim 1 or 2, characterised in that an axial section (41) of at least one support arm (33, 34, 35) is tilted in the radial direction (45) relative to the axial direction (16).
4. Bearing shield according to one of claims 1-3, characterised in that an axial section (41) of at least one support arm (33, 34, 35) is tilted in the tangential direction (51) relative to an axial plane (52).
5. Bearing shield according to one of claims 1-4, characterised in that fastening points (43) for fastening the support arms (33, 34, 35) to the housing (7) are spaced at different distances from each other in the circumferential direction (54).
6. Bearing shield according to one of claims 1-5, characterised in that exactly three support arms (33, 34, 35) are provided.
7. Bearing shield according to claim 6, characterised in that an angle (55, 56, 57) between an attachment point (43) of a first and an attachment point (43) of a second support arm (33, 34) is between 105° and 115°, between the attachment point (43) of the second and an attachment point (43) of a third support arm (35) is between 115° and 125°, and between the attachment point (43) of the third and the attachment point (43) of the first support arm (35, 33) is between 125° and 135°.
8. Bearing shield according to one of claims 1-7, characterised in that connection points (61) of the support arms (33, 34, 35) on the second mount (27) are spaced apart from one another equally in the circumferential direction (54).
9. Bearing shield according to one of claims 1-8, characterised in that a respective axial section (41) of a support arm (33, 34, 35) continues in an axial holding web (64) of the second mount (27).
10. Bearing shield according to claim 9, characterised in that the axial holding sections (64) are connected to the first mount (17) via a respective radial holding arm (63).
11. Bearing shield according to one of claims 1-10, characterised in that at least one of the support arms (33, 34, 35) has an S-shaped cross-section (66).
12. Range hood (1) with a radial fan (2), which comprises a fan motor (3), a fan wheel (4) driven by the fan motor (3), a housing (7) in which the fan wheel (4) is arranged, and a bearing shield (13) according to one of claims 1-11, which is fastened to the housing (7) by means of its support arms (33, 34, 35) and holds a rotor (14) and a stator (15) of the fan motor (3) entirely within the fan wheel (4).
13. Range hood according to claim 12, characterised in that an axial section (41) of at least one support arm (33, 34, 35) is designed to conduct intake air (71, 72) into the fan wheel (4).
14. Range hood (1) according to claim 12 or 13, characterised in that an axial section (41) of at least one support arm (33, 34, 35) is tilted in the direction of rotation (73) of the fan wheel (4) during operation of the radial fan (2).
15. Range hood according to one of claims 12-14, characterised in that those two fastening points (43) of the bearing shield (13) on the housing (7) which are the greatest distance apart from one another in the circumferential direction (54) span an air outlet (12) thereof.

Images