FAN ARRANGEMENT WITH FAN AND TOOTHED RING, AND CONVERTER MOTOR WITH FAN ARRANGEMENT

Abstract

A fan arrangement includes a fan and toothed ring, and a converter motor includes a fan arrangement. The fan includes a base body on which fan blades are premolded, and the fan includes an annular region, which is premolded on the side of the fan blades facing away from the base body. The toothed ring is situated within the annular region, and thus, in particular, is set apart from the base body, and thus, in particular, is set apart from the base body via the fan blades.

Claims

1-15. (canceled)

16. A fan arrangement, comprising: a fan; and a toothed ring; wherein the fan includes a base body, fan blades being premolded on the base body, the fan including an annular region that is premolded on a side of the fan blades facing away from the base body; and wherein the toothed ring arranged within the annular region.

17. The fan arrangement according to claim 16, wherein the toothed ring is set apart from the base body.

18. The fan arrangement according to claim 16, wherein the toothed ring is set apart from the base body via the fan blades.

19. The fan arrangement according to claim 16, wherein radially outer end regions of the toothed ring are not surrounded by the material of the fan and/or the toothed ring is arranged as an integrated part of the fan.

20. The fan arrangement according to claim 19, wherein the entire toothed ring except for the radially outer end regions is surrounded by the material of the fan.

21. The fan arrangement according to claim 16, wherein the fan blades extend in axial and radial directions.

22. The fan arrangement according to claim 16, wherein a wall thickness of at least one fan blade is constant in a circumferential direction and/or in a tangential direction.

23. The fan arrangement according to claim 22, wherein the tangential direction is aligned parallel to a tangential direction extending through a center point of the respective fan blade.

24. The fan arrangement according to claim 22, wherein the wall thickness of each fan blade is constant in the circumferential direction and/or in the tangential direction.

25. The fan arrangement according to claim 16, wherein the toothed ring includes teeth that project radially outwardly.

26. The fan arrangement according to claim 16, wherein the toothed ring and the teeth are surrounded by material of the annular region, only radial outer surfaces of the teeth being not covered by the material of the annular region.

27. The fan arrangement according to claim 16, wherein the toothed ring is formed of ferrite, a ferromagnetic material, and/or steel.

28. The fan arrangement according to claim 16, wherein the base body includes a rotational body.

29. The fan arrangement according to claim 16, wherein the base body includes a conical region that transitions to a hollow-cylindrical region of the base body in a radially inward direction.

30. The fan arrangement according to claim 16, wherein airflow conveyed by the fan passes through between two most proximate fan blades between the annular region and the base body.

31. The fan arrangement according to claim 16, wherein an axial region covered by the annular region is encompassed by an axial region covered by the fan blades.

32. The fan arrangement according to claim 16, wherein an axial region covered by the toothed ring is encompassed by an axial region covered by the fan blades.

33. The fan arrangement according to claim 16, wherein an axial region covered by the annular region is encompassed by an axial region covered by the base body.

34. The fan arrangement according to claim 16, wherein a radial clearance region covered by the annular region is arranged within a radial clearance region covered by the fan blades.

35. The fan arrangement according to claim 16, wherein the annular region smoothly transitions to at least one of the fan blades and/or each of the fan blades.

36. The fan arrangement according to claim 16, wherein the annular region smooth transitions to at least one of the fan blades and/or each of the fan blades in a rounded manner.

37. The fan arrangement according to claim 16, wherein the fan, the base body, the fan blades, and/or the annular region include a plastic injection-molded part.

38. The fan arrangement according to claim 16, wherein the fan has a rounded region as a transition between the fan blades and the annular region, the rounded region having a curvature radius that decreases monotonically, strictly monotonically, in a linear fashion, and or according to a polynomial function in an axial plane in an axial direction, with increasing distance from the base body, in particular in a linear fashion or according to a polynomial function.

39. A converter motor, comprising: a fan arrangement as recited in claim 16; an electric motor including a rotor shaft, the fan being connected to the rotor shaft in a torsion-resistant manner; and a sensor adapted to detect the toothed ring releasably connected to a stator housing of the electric motor.

40. The converter motor according to claim 39, wherein the sensor is adapted to detect the teeth of the toothed ring, and wherein the sensor is connected to the stator housing of the electric motor in a torsion-resistant manner.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 is a plan view of a fan arrangement according to an example embodiment of the present invention.

[0024] FIG. 2 is an exploded view of the fan arrangement.

[0025] FIG. 3 is a side view of the fan arrangement.

DETAILED DESCRIPTION

[0026] In FIG. 1, a plan view of a fan arrangement according to an example embodiment of the present invention is illustrated, which has a fan 1 that includes an integrated toothed ring 2 and a sensor 3.

[0027] In FIG. 2, a perspective view of the fan is illustrated, the toothed ring being illustrated separately.

[0028] In FIG. 3, a side view of the fan arrangement is illustrated.

[0029] As illustrated in the Figures, the fan arrangement has a fan 1 on which fan blades 4 are premolded.

[0030] Fan 1 is able to be connected in a torsion-resistant manner to a shaft. It is placed on top of the shaft in a centered manner.

[0031] Fan 1 also has a base body including a conical region 5 and a hollow-cylindrical region 6, which is provided with a centrically positioned round hole for the introduction of the shaft. The base body is a rotational body. In other words, it has a conical shape radially outside a first radial clearance and is hollow-cylindrical radially inside the first radial clearance value. The transition from conical form 5 to hollow-cylindrical form 6 has a rounded configuration so that this rounded region it situated in the region of the of the first radial clearance.

[0032] Fan blades 4 are premolded on base body 5.

[0033] In the circumferential direction with respect to the axis of rotation, i.e. the shaft axis, fan blades 4 are set apart from one another at regular intervals. Fan blades 4 have a leaf-shaped, in particular planar, configuration and thus extend in the radial and axial direction. The wall thickness measured in the circumferential direction is constant.

[0034] On the side of the fan blades situated across from the base body, an annular region 7 is provided on the fan, in which toothed ring 2 is situated. Although the material of the fan covers the toothed ring 2, it does not cover the radial end regions of the radially outward directed teeth of toothed ring 2. As a result, the distance from the stationary flow-routing elements of sensor 3 is as small as possible.

[0035] The radial clearance region covered by annular region 7 is encompassed by the radial clearance region covered by fan blades 4.

[0036] The axial region covered by annular region 7 is encompassed by the axial region covered by fan blades 4.

[0037] Annular region 7 is provided without circumferential interruptions in the circumferential direction.

[0038] The radial clearance region covered by annular region 7 extends from a second radial clearance to a third radial clearance, and the third radial clearance is greater than the second radial clearance, which is greater than the first radial clearance.

[0039] As a result, a space region for the airflow conveyed by the fan is provided between two most proximate fan blades 4 in the circumferential direction in each case, the airflow entering in the axial direction in the radial clearance region between the first and the second radial clearance and exiting in the radial direction radially outside the third radial clearance. The airflow conveyed by the fan thus axially passes through between annular region 7 and base body 5.

[0040] The transition region from fan blades 4 to annular region 7 is arranged in rounded form in each case. In FIG. 1 and FIG. 2, reference numeral 8 is used for this rounded region. Rounded region 8 extends in the axial direction across the entire axial width of annular region 7. Such a rounded transition region is provided starting at fan blade 4 in the circumferential direction, and a further transition region rounded in this manner is provided starting at the fan blade counter to the circumferential direction.

[0041] The curvature radius at an axial position h is denoted by r(h). Curvature radius r(h) monotonically decreases, in particular strictly monotonically, as the distance, in particular the axial distance, to the base body decreases. In other words, the curvature radii r(h) decrease more and more in the respective axial plane toward the base body until the curvature radius r(h) becomes zero, and thus reaches the axially lowest value of annular region 7.

[0042] The decrease in the curvature radius r(h) until it vanishes may be a linear function of the axial position. As a result, an uncomplicated production is possible, and a laminar flow of the conveyed airflow is able to be induced.

[0043] The center point of respective curvature radius r(h) of a first rounded region allocated to respective fan blade 4 has a radial clearance value that increases monotonically, in particular strictly monotonically, with the axial position, in particular with the axial distance from the base body, and/or an increasing circumferential angle value.

[0044] The center point of the particular curvature radius r(h) of the other rounded region allocated to respective fan blade 4 has a radial clearance value that increases monotonically, in particular strictly monotonically, with the axial position, in particular with the axial distance from the base body, and/or a decreasing circumferential angle value.

[0045] The mentioned dependency of the respective radial clearance value and the amount of the circumferential angle value may be a linear function of the axial position. This allows for an uncomplicated production and makes it possible to induce a laminar flow of the conveyed airflow. The linear function is selected such that when the curvature radius r(h) vanishes, the associated center point touches the annular region.

[0046] In further exemplary embodiments, a polynomial dependency, in particular with a polynomial of the second degree, on the axial position is also advantageous in order to induce an even further improved laminar airflow. This applies both to the radial clearance and/or to the amount of the circumferential angle value of the center point and also the curvature radius r(h).

[0047] Fan 1 is able to be produced as a cast component, in particular from plastic, in particular using an injection molding method. Prior to the casting process, metallic toothed ring 2 is inserted into the casting mold and toothed ring 2 is thus surrounded by material, in particular plastic, of the fan. Toothed ring 2 remains uncovered only at the radially outer edge region so that no material of the fan is present between the sensor including its flow-routing element and these outer edge regions. This makes it possible to achieve a very narrow airgap between toothed ring 2 and the flow-routing element of sensor 3.

LIST OF REFERENCE NUMERALS

[0048] 1 fan [0049] 2 toothed ring [0050] 3 sensor with flow-routing elements [0051] 4 fan blade [0052] 5 base body including conical and hollow-cylindrical region [0053] 6 hollow-cylindrical region [0054] 7 annular region [0055] 8 rounded region