Fan for motor vehicle

Abstract

The invention relates to a fan for a motor vehicle, comprising a fan wheel (3) that can be rotated about an axis of rotation (RA). The fan wheel (3) comprises an outer ring (5), an inner ring (7) and at least one blade (8). The blade (8) comprises a first section (9a) connected to the outer ring (5) and a second section connected to the inner ring (7). A first section (9a) of the blade (8) has a first angle (a) with respect to the outer ring (5) of between 70 DEG and 110 DEG and a second angle (b) with respect to a second section (9b) of the blade (8), different from zero.

Description

Technical Field

[0001] The present invention relates to a fan for a motor vehicle having a fan wheel, and a motor vehicle having a fan. Background Technology

[0002] In motor vehicles, fans are used to deliver air from a fresh air inlet, such as at the radiator grille, into the engine compartment. Such fans typically consist of a fan impeller and a support frame that carries the impeller. The turbulence of the airflow generated by the fan can produce noise and also degrade fan performance. Summary of the Invention

[0003] Therefore, the objective of this invention is to describe an improved or at least alternative embodiment for fans of a particular type, which overcomes the disadvantages described.

[0004] This task is solved according to the invention by the subject matter of the independent claim. Advantageous embodiments are the subject matter of the dependent claims.

[0005] The fan according to the invention is provided or designed for use in a motor vehicle. The fan includes a fan wheel rotatable about an axis of rotation, the fan wheel having an outer ring and an inner ring. The outer ring is circumferentially spaced from the axis of rotation and arranged radially outward with respect to the inner ring. The inner ring is circumferentially spaced from the axis of rotation and arranged radially inward with respect to the outer ring. The outer ring includes a first face, circumferentially and parallel to the axis of rotation, and oriented opposite to the inner ring. The inner ring includes a second face, circumferentially and parallel to the axis of rotation, and oriented opposite to the outer ring. The fan wheel further includes at least one blade having a first segment and a second segment. The first segment of at least one blade is connected to the first face of the outer ring, and the second segment of at least one blade is connected to the second face of the inner ring. In a plane perpendicular to the axis of rotation, the first segment of at least one blade is oriented at a first angle relative to the first face of the outer ring and at a second angle relative to the second segment of at least one blade. The first angle is between 70° and 110°. The second angle is not zero, or in other words, the two segments of at least one blade have a bend that transitions into each other. In one possible implementation of the fan, the second angle can be between 25° and 55°.

[0006] In the fan according to the invention, the first section of at least one blade is oriented at approximately 90° relative to the first surface of the outer ring. This allows for a particularly stable and secure connection of at least one blade to the outer ring and reduces noise generation. Furthermore, the stable fastening of at least one blade to the outer ring allows for greater design freedom in terms of noise reduction and efficiency. Thus, with at least one blade stably fastened to the outer ring, overall noise generation in the fan wheel or fan can be reduced, and fan efficiency can be improved.

[0007] In one possible implementation of the fan, at least one blade may have the greatest axial extension in the first section. In other words, at least one blade may have a smaller axial extension in the second section compared to the first section.

[0008] In one possible implementation of the fan, the axial extension of the outer ring within the first section of at least one blade may be less than the maximum axial extension of at least one blade. In other words, at least one blade axially protrudes beyond the outer ring. Despite the above-described design of the first section, at least one blade can still be stably and securely fastened to the outer ring.

[0009] In one possible implementation of the fan, the axial extension of the outer ring within the first section of at least one blade may be between 50% and 110% of the maximum axial extension of at least one blade.

[0010] In one possible implementation of the fan, the radial extension of the first segment of at least one blade may be less than the radial extension of the second segment of at least one blade.

[0011] In one possible implementation of the fan, the radial extension of the first segment of at least one blade can be between 1% and 5% of the radial distance between the first surface of the outer ring and the second surface of the inner ring. Therefore, the design of the first segment of at least one blade can be adjusted for secure fastening of at least one blade on the outer ring without negatively impacting fan noise generation and efficiency.

[0012] In one possible implementation of the fan, the radial extension of the second section of at least one blade is between 95% and 99% of the radial distance between the first surface of the outer ring and the second surface of the inner ring. This allows for greater design freedom in terms of noise reduction and efficiency.

[0013] In one possible implementation of the fan, the fan may have a support frame. Here, the fan wheel is rotatably secured to the support frame. The support frame may surround the fan wheel at least around its outer circumference and around its axis of rotation. Furthermore, the fan may have an electric motor secured to the support frame. The electric motor may be arranged axially adjacent to the fan wheel and driven by the fan wheel.

[0014] The present invention also relates to a motor vehicle having a fresh air inlet for drawing in fresh air and the aforementioned fan, wherein the fan is fluidly connected downstream of the fresh air inlet. The fresh air inlet may be constructed, in particular, of the vehicle's radiator grille, and the fan is designed to deliver fresh air from the radiator grille to the engine compartment of the motor vehicle.

[0015] In conjunction with this invention, the terms "axial," "radial," and "circumferential" always refer to the axis of rotation of the fan wheel. The term "axial extension of an element" refers to the extension of the element along the axis of rotation of the fan wheel. The term "radial extension of an element" refers to the extension of the element along a radial axis oriented radially relative to the axis of rotation. At least one first segment of a blade and / or at least one second segment of a blade may have a stepless or bend-free orientation in a plane perpendicular to the axis of rotation. At least one first segment of a blade may have a particularly straight orientation, and at least one second segment of a blade may have a particularly arched orientation. A first angle may be determined, particularly at the point of contact between the first segment and the first surface of the outer ring, between the longitudinal centerline of the first segment passing through the point of contact and the tangent of the first surface of the outer ring passing through the point of contact. A second angle may be determined, particularly at the point of contact between the first and second segments, between their longitudinal centerlines passing through the point of contact.

[0016] Further important features and advantages of the invention will be apparent from the dependent claims, the drawings, and the accompanying description with reference to the drawings.

[0017] It should be understood that the features mentioned above and further explained below can be used not only in combinations described separately, but also in other combinations or individually, without departing from the scope of the present invention.

[0018] Preferred embodiments of the invention are shown in the accompanying drawings and described in more detail in the following description, wherein the same reference numerals refer to the same or similar or functionally identical parts. Attached Figure Description

[0019] The diagram illustrates the following:

[0020] Figure 1 A view of a fan according to the invention, having a fan wheel and a support frame, is shown;

[0021] Figure 2 A partial view of the fan wheel of a fan according to the present invention is shown;

[0022] Figure 3 A partial view of the fan wheel of the fan according to the present invention at its outer circumference is shown;

[0023] Figure 4 A cross-sectional view of the fan wheel of the fan according to the present invention at its outer circumference is shown. Detailed Implementation

[0024] Figure 1 A view of a fan 1 for a motor vehicle according to the present invention is shown. The fan 1 includes a support frame 2 and a fan wheel 3. The fan wheel 3 is rotatably secured to the support frame 2 about a rotation axis RA. Furthermore, the fan 1 includes an electric motor 4, which is secured to the support frame 2 and drivenly connected to the fan wheel 3. The possible direction of rotation RR of the fan wheel 3 is indicated here by arrows. However, this direction of rotation can also be in the opposite direction.

[0025] Figure 2 A partial view of a fan wheel 3 according to a fan 1 is shown. The fan wheel 3 includes an outer ring 5 having a first surface 6a and an inner ring 7 having a second surface 6b. The outer ring 5 and the inner ring 7 are constructed around a rotation axis RA, wherein the outer ring 5 is arranged radially outward relative to the inner ring 7. The first surface 6a on the outer ring 5 and the second surface 6b on the inner ring 7 are oriented around the rotation axis RA and parallel to this rotation axis. Surfaces 6a and 6b are arranged opposite each other and have a radial distance BL between them.

[0026] Furthermore, the fan wheel 3 also includes multiple blades 8, which are evenly distributed around the axis of rotation RA between the outer ring 5 and the inner ring 7. Each blade 8 includes a first section 9a and a second section 9b, which transition into each other. Each blade 8 comprises only two sections, 9a and 9b. The first section 9a is fastened to the first surface 6a of the outer ring, and the second section 9b is fastened to the second surface 6b of the inner ring 7. The first section 9a and the second section 9b of the blade 8 are perpendicular to the axis of rotation RA and do not have bends. The first section 9a of the blade 8 has a straight orientation, and the second section 9b of the blade 8 has an arched orientation perpendicular to the axis of rotation RA.

[0027] The first segment 9a of blade 8 has a radial extension W1, and the second segment 9b of blade 8 has a radial extension W2. The sum of the two radial extensions W1 and W2 gives the total radial extension of blade 8, which corresponds to the distance BL between surfaces 6a and 6b. Figure 3As can be seen, the radial extension W1 of the first segment 9a of blade 8 is much smaller than the radial extension W2 of the second segment 9b of blade 8, that is, many times smaller. Specifically, the radial extension W1 of the first segment 9a of blade 8 can be between 1% and 5% of the pitch BL. Correspondingly, the radial extension W2 of the second segment 9b of blade 8 can be between 95% and 99% of the pitch BL.

[0028] Figure 3 A partial view of the fan wheel 3 of the fan 1 according to the invention at the outer ring 5 is shown. In a plane oriented perpendicular to the axis of rotation RA, the first segment 9a of the blade 8 is oriented relative to the first surface 6a of the outer ring 5 at a first angle α. Furthermore, segments 9a and 9b of the blade 8 have a second angle b between them. The first angle α can be particularly between 70° and 110° and the second angle b can be particularly between 25° and 55°. The blade 8 can be connected to the outer ring 5 particularly stably and securely via the first segment 9a. This advantageously reduces noise generation in the fan 1. Due to the achieved stable connection, the blade 8 can also be designed with greater freedom in terms of noise reduction and efficiency in the second segment 9b.

[0029] Figure 4 A partial cross-sectional view of the fan wheel 3 of the fan 1 according to the present invention at the outer ring 5 is shown. The outer ring 5 here has an axial extension FRW and the blade 8 has a maximum axial extension BB. The axial extension FRW of the outer ring 5 can be particularly between 55% and 110% of the maximum axial extension BB of the blade 8. In the embodiment shown here, the axial extension FRW of the outer ring 5 is less than the maximum axial extension of the blade 8. Furthermore, here, the blade 8 has the maximum axial extension BB in the first section 9a.

[0030] List of reference numerals

[0031] 1 fan

[0032] 2 load-bearing frame

[0033] 3 fan wheels

[0034] 4 electric motors

[0035] 5 outer ring

[0036] 6a / 6b First page / Second page

[0037] 7 Inner Circle

[0038] 8 blades

[0039] 9a / 9b Section 1 / Section 2

[0040] a / b First angle / Second angle

[0041] BL spacing

[0042] FRW / BB axial elongation

[0043] RA rotation axis

[0044] RR rotation direction

[0045] Radial extension of W1 / W2

Claims

1. A fan (1) for a motor vehicle, the fan having a fan wheel (3) rotatable about a rotation axis (RA). - in, The fan wheel (3) has an outer ring (5) that is spaced apart around the axis of rotation (RA) and arranged radially outward, and an inner ring (7) that is spaced apart around the axis of rotation (RA) and arranged radially inward. - Wherein, the outer ring (5) has a first surface (6a) that is oriented around and parallel to the axis of rotation (RA) and opposite to the inner ring (7), and the inner ring (7) has a second surface (6b) that is oriented around and parallel to the axis of rotation (RA) and opposite to the outer ring (5). - Wherein, the fan wheel (3) has at least one blade (8), the blade having a first section (9a) connected to a first surface (6a) of the outer ring (5) and a second section (9b) connected to a second surface (6b) of the inner ring (7), and - Wherein, in a plane perpendicular to the orientation of the rotation axis (RA), the first segment (9a) of the at least one blade (8) is oriented at a first angle (a) between 70° and 110° relative to the first surface (6a) of the outer ring (5) and at a second angle (b) different from zero relative to the second segment (9b) of the at least one blade (8).

2. The fan (1) according to claim 1, Its features are, The second angle (b) is between 25° and 55°.

3. The fan (1) according to claim 1 or 2. Its features are, The at least one blade (8) has the maximum axial extension (BB) in the first section (9b).

4. The fan (1) according to any one of claims 1 to 3. Its features are, The axial extension (FRW) of the outer ring (5) within the first section (9a) of the at least one blade (8) is less than the maximum axial extension (BB) of the at least one blade (8).

5. The fan (1) according to any one of claims 1 to 3. Its features are, The axial extension (FRW) of the outer ring (5) within the first section (9a) of the at least one blade (8) is between 50% and 110% of the maximum axial extension (BB) of the at least one blade (8).

6. The fan (1) according to any one of the preceding claims. Its features are, The radial extension (W1) of the first segment (9a) of the at least one blade (8) is less than the radial extension (W2) of the second segment (9b) of the at least one blade (8).

7. The fan (1) according to any one of the preceding claims. Its features are, - The radial extension (W1) of the first segment (9a) of the at least one blade (8) is between 1% and 5% of the radial spacing (BL) between the first face (6a) of the outer ring (5) and the second face (6b) of the inner ring (7), and / or - The radial extension (W2) of the second section (9b) of the at least one blade (8) is between 95% and 99% of the radial spacing (BL) between the first surface (6a) of the outer ring (5) and the second surface (6b) of the inner ring (7).

8. The fan (1) according to any one of the preceding claims. Its features are, - The fan (1) has a support frame (2), wherein the fan wheel (3) is rotatably fastened to the support frame (2), and - The support frame (2) surrounds the fan wheel (3) at least around the outer ring (5) and around the axis of rotation (RA).

9. The fan (1) according to claim 8. Its features are, - The fan (1) has an electric motor (4) fastened to the support frame (2), and - The electric motor (4) is arranged axially adjacent to the fan wheel (3) and is driven by the fan wheel (3).

10. A motor vehicle having a fresh air inlet for drawing in fresh air and a fan (1) according to any one of the preceding claims, wherein, The fan (1) is fluidly connected downstream of the fresh air inlet.

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