Rotor for a fan

Abstract

The present invention relates to a rotor (1) for a fan having a motor block, wherein the electric motor of the fan (100) extends into the main flow region of the fan impeller (101) of the fan (100), wherein at least one axial end (11) of the rotor (1) and / or the axial end section of the rotor (1) is formed non-rotationally symmetrically.

Description

Technical Field

[0001] The present invention relates to a rotor for a fan having a motor block, wherein the electric motor of the fan extends into the flow region of the main airflow of the fan impeller. Background Technology

[0002] In the prior art, various compact fans are known in which the electric motor extends significantly into the impeller, resulting in motor blockage. This is because the motor is inserted into or extends into the flow area of ​​the fan impeller. This arrangement obstructs airflow, leading to efficiency losses, turbulence, increased noise levels, and a reduction in the overall performance of the fan.

[0003] The significantly poor technical specifications are due to flow separation at the fan rotor where the motor is clogged. In this situation, the flow can no longer follow the rotor's profile and separates, creating stagnant or backflow zones on the rotor. Due to this separation, turbulence in these areas increases significantly.

[0004] To date, the only known measure to optimize the corresponding fan is to reduce motor blockage. One known possibility for reducing motor blockage is to fill the recirculation zone with material or to design the impeller so that no recirculation zone is generated. However, this is not always possible or feasible structurally and / or technically. In this case, the impeller can only be adapted to one motor length. Another possibility for reducing motor blockage is to pull the motor out of the impeller. There, the impeller is mounted on a second flange. Furthermore, motor blockage can be further reduced for the impeller by bending in the chassis. However, this increases the axial extension of the fan.

[0005] Furthermore, while altering the rotationally symmetric rotor geometry can improve fan efficiency and reduce noise, it cannot completely eliminate separation, thus limiting the resulting solutions to only minor improvements to the fan. Summary of the Invention

[0006] Therefore, the present invention aims to overcome the above-mentioned disadvantages and provide a rotor for a fan with motor blockage and a corresponding fan, in which flow separation and noise emissions at the rotor are reduced and efficiency is optimized.

[0007] This task is solved by the combination of features described in claim 1 of the patent.

[0008] The basic concept of this invention is that flow separation at the rotor can be significantly improved by using a non-rotationally symmetric rotor shape. Therefore, energy is preferably supplied to the flow through rib-like ridges and / or protrusions, which, in combination with contractions and / or recesses, deflect the flow axially. In this way, flow separation at the rotor is significantly reduced. By at least partially deflecting the main flow axially or along the axis of rotation, efficiency is optimized and noise emissions are reduced compared to a rotationally symmetric rotor. Furthermore, the cooling effect on the flow is optimized.

[0009] Therefore, according to the present invention, a rotor for a fan, particularly a radial fan, is proposed, having a motor block, wherein the electric motor of the fan, particularly the rotor of the electric motor, extends into the main flow region of the fan impeller, wherein at least one axial end and / or axial end section of the rotor, preferably the rotor housing, is formed non-rotationally symmetrically, particularly such that the main flow can be at least partially deflected in the axial direction. In this way, separation of the main flow at the rotor can be reduced. Further particularly, the outer circumference of the rotor and / or the outer casing and / or the outer circumferential surface are formed non-rotationally symmetrically.

[0010] In one advantageous implementation variant, it is specified that one or more ridges and / or protrusions are formed at the axial end.

[0011] Preferably, the rotor is configured such that at least one ridge and / or protrusion extends, in particular, in a straight and / or curved manner, in the radial direction of the rotor, and preferably all the ridges and / or protrusions extend, in particular, at least in sections, from the center of the rotor or the axial end of the rotor to the radial end of the rotor.

[0012] In one embodiment of the invention, at least one raised portion and / or protrusion is formed in the radial direction as tapered and / or tapered at an acute angle.

[0013] Furthermore, one embodiment is advantageous in which a plurality of ridges and / or protrusions are preferably evenly distributed or arranged at predetermined intervals in the circumferential direction of the rotor.

[0014] In another advantageous variant, it is specified that one or more ridges and / or protrusions are formed as ribs and / or sternites.

[0015] In an advantageous embodiment of the invention, one or more contractions and / or recesses are formed at the axial end.

[0016] In a preferred embodiment of the invention, at least one raised portion and / or protruding portion is preferably formed adjacent to and / or on both sides of the contraction portion and / or depression.

[0017] In another embodiment of the invention, one or more contractions and / or recesses are formed as concave bends.

[0018] Furthermore, according to the present invention, a fan is proposed having a motor block, wherein the electric motor of the fan extends into the main flow region of the fan impeller of the fan, the fan having a rotor according to the foregoing disclosure. The fan impeller is arranged on the rotor, and the rotor, particularly the rotor shroud, extends into the main flow region of the fan impeller.

[0019] In particular, motor blockage related to this invention occurs when the ratio of the rotor diameter to the inlet diameter of the fan impeller meets the following condition: (rotor diameter / fan impeller inlet diameter) > 0.3; and the same applies to the ratio of the rotor height to the C-dimension of the fan impeller: (rotor height / fan impeller C-dimension) > 0.3, especially (rotor diameter / fan impeller inlet diameter) > 0.4 and (rotor height / fan impeller C-dimension) > 0.5. Wherein, the rotor height corresponds to the axial extension of the rotor, and the rotor C-dimension corresponds to the axial extension of the fan impeller.

[0020] In one advantageous embodiment, the number of one or more ridges and / or protrusions corresponds to and / or equals the number of guide vanes of the wind turbine impeller. Alternatively, an embodiment may be considered in which the number of ridges and / or protrusions is two and / or half and / or three and / or one-third of the number of guide vanes of the wind turbine impeller.

[0021] Provided it is technically feasible and not contradictory, the features disclosed above can be combined as needed. Attached Figure Description

[0022] Other advantageous embodiments of the invention are described in the dependent claims, or are described in more detail below together with the description of preferred embodiments of the invention, with reference to the accompanying drawings.

[0023] Figure 1a A perspective view of a fan with a rotor is shown;

[0024] Figure 1b A cross-sectional view of the fan is shown;

[0025] Figure 2a A top view of the rotor is shown;

[0026] Figure 2b A cross-sectional view of the rotor is shown;

[0027] Figure 2c Another cross-sectional view of the rotor is shown.

[0028] The accompanying drawings are illustrative examples. The same reference numerals in the drawings denote the same functional and / or structural features. Detailed Implementation

[0029] exist Figure 1a The diagram shows a perspective view of a fan 100 with a motor block, wherein the electric motor of the fan 100 extends into the flow region of the main airflow of the fan impeller 101 of the fan 100. The fan 100 has a rotor 1. Furthermore, the fan impeller 101 is arranged on the rotor 1, and the rotor 1 extends into the flow region of the main airflow of the fan impeller 101. At least one axial end 11 and / or an axial end section of the rotor 1 is formed non-rotationally symmetrically, thereby reducing the separation of the main airflow at the rotor 1. Specifically, the outer circumference of the rotor and / or the outer casing and / or the outer circumferential surface are formed non-rotationally symmetrically.

[0030] Furthermore, five rib-like and / or web-like ridges and / or protrusions 12 are formed at the axial end 11. The number of ridges and / or protrusions 12 corresponds to the number of guide vanes on the fan impeller 101. The ridges and / or protrusions 12 extend in the radial direction of the rotor 1. The rotor 1 is also configured such that the ridges and / or protrusions 12 extend linearly in the radial direction of the rotor, particularly segmentally extending from the center of the rotor 1 or the axial end 11 of the rotor 1 to the radial end of the rotor 1. Furthermore, the ridges and / or protrusions 12 are tapered and / or tapered at an acute angle in the radial direction. Moreover, the plurality of ridges and / or protrusions 12 are evenly distributed in the circumferential direction of the rotor 1.

[0031] Multiple contractions and / or recesses 13 are also formed at the axial end 11 of the rotor, which are arranged adjacent to and on both sides of corresponding ridges and / or protrusions 12. The contractions and / or recesses 13 are formed as concave bends.

[0032] exist Figure 1b It shows Figure 1a The cross-sectional view of the fan 100 with rotor 1 shown.

[0033] Figure 2a A top view of rotor 1 in Figure 1 is shown for illustration. Figure 2b and Figure 2c The sectional view shown. Wherein, Figure 2b A cross-sectional view is shown along the Z-axis through a contraction and / or recess 13 of rotor 1. Figure 2c A cross-sectional view is shown along the Z-axis through a ridge and / or protrusion 12. The rotor 1 has five ridges and / or protrusions 12, and according to... Figure 2a The adjacent bulges and / or protrusions 12 and constrictions and / or depressions 13 are rotated about 15° relative to each other.

[0034] according to Figure 2b In the cross-section passing through the contraction and / or recess 13, a region of the axial end 11 of the rotor 1 and / or the axial end section of the rotor 1 is obtained, in which the profile almost corresponds to the straight line between the rotor mount and the axial end 11 of the rotor 1. The axial end section 11 of the rotor 1 is formed as a convex surface here.

[0035] In addition, according to Figure 2c In the cross section passing through the ridge and / or protrusion 12, a region is obtained in which the profile of the rotor extends straight along the Z-axis and bends only in the mounting area.

[0036] exist Figure 2b and Figure 2c The height h of the non-rotationally symmetric axial end section 11 is shown in the figure. Furthermore, in... Figure 2b and Figure 2c The figures show 1 / 4, 1 / 2, and 3 / 4 of the height h, respectively.

[0037] At 1 / 4 of the height, the maximum radial extension of the axial end section 11 is 100% of the distance (rotor diameter - mounting base diameter), or 100% of the rotor diameter. Preferably, the maximum radial extension of the axial end section 11 is 70% to 120% of the distance (rotor diameter - mounting base diameter), more preferably 90% to 110%. The minimum radial extension of the axial end section 11 is offset by approximately 15° and is 81% of the distance (rotor diameter - mounting base diameter).

[0038] At half the height, the maximum radial extension of the axial end section 11 is 100% of the distance (rotor diameter - mounting base diameter), or 100% of the rotor diameter. Preferably, the maximum radial extension of the axial end section 11 is 70% to 120% of the distance (rotor diameter - mounting base diameter), more preferably 90% to 110%. The minimum radial extension of the axial end section 11 is also offset by about 15° and is 60% of the distance (rotor diameter - mounting base diameter).

[0039] At 3 / 4 of the height, the maximum radial extension of the axial end section 11 is 102% of the distance (rotor diameter - mounting base diameter), or 101% of the rotor diameter. Preferably, the maximum radial extension of the axial end section 11 is 70% to 120% of the distance (rotor diameter - mounting base diameter), more preferably 90% to 110%. The minimum radial extension of the axial end section 11 is also offset by about 15° and is 34% of the distance (rotor diameter - mounting base diameter).

[0040] Accordingly, the maximum radial extension of the axial end section 11 is 70% to 120% of the distance (rotor diameter - mounting base diameter), more preferably 90% to 110%.

[0041] Figure 2a It is also shown that constrictions and / or depressions 13 are formed on the adjacent bulges and / or protrusions 12 on both sides. A slight bulge is formed between every two corresponding constrictions and / or depressions 13.

[0042] This invention is not limited to the preferred embodiments described above. Rather, the invention can have many variations that also utilize embodiments that are substantially different from those described above.

Claims

1. A rotor (1) for a fan having a motor block, wherein the electric motor of the fan (100) extends into the main flow region of the fan impeller (101) of the fan (100), At least one axial end (11) of the rotor (1) and / or the axial end section of the rotor (1) is formed non-rotationally symmetrically, in particular such that the main flow can be at least partially deflected in the axial direction. One or more ridges and / or protrusions (12) are formed at the axial end (11). One or more contractions and / or recesses (13) are formed at the axial end (11).

2. The rotor (1) according to claim 1, wherein at least one of the raised portion and / or protrusion (12) extends in the radial direction of the rotor (1).

3. The rotor (1) according to claim 2, wherein at least one of the raised portion and / or protrusion (12) is formed in the radial direction as tapered and / or tapered at an acute angle.

4. The rotor (1) according to any one of claims 1 to 3, wherein the plurality of raised portions and / or protrusions (12) are distributed in the circumferential direction of the rotor (1), preferably evenly distributed.

5. The rotor (1) according to any one of claims 1 to 4, wherein the one or more ridges and / or protrusions (12) are formed as ribs and / or webs.

6. The rotor (1) according to any one of the preceding claims, wherein preferably at least one of the raised portions and / or protrusions (12) adjacent to and / or adjacent to both sides is formed with a contraction portion and / or a recess (13).

7. The rotor (1) according to any one of the preceding claims, wherein the one or more contractions and / or recesses (13) are formed as concave bends.

8. A fan (100) having a motor block, wherein the electric motor of the fan (100) extends into the main flow region of the fan impeller (101) of the fan (100), the fan having a rotor (1) according to any one of the preceding claims, wherein the fan impeller (101) is arranged on the rotor (1), and wherein the rotor (1) extends into the main flow region of the fan impeller (101) of the fan (100).

9. The fan according to claim 10, wherein the number of the one or more ridges and / or protrusions (12) corresponds to the number of guide vanes of the fan impeller (101).

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