RADIAL VENTILATOR

Abstract

A radial ventilator (1) has a base part (2), a housing part (4), with a discharge 33, placed on the base part (2), a motor electronics unit (98), and an internal rotor electric motor. The motor drives a ventilator wheel (3) via a shaft (7). The motor electronics unit (98) and a stator (32) of the electric motor are encapsulated by an extrusion coating (17) in the base part (2) and together form an integral one-piece structural unit. The radial ventilator (1) has a pressure chamber (D) enlarging in a spiral shape around the ventilator wheel (3). The pressure chamber (D) is formed and defined by the housing part (4) and the extrusion coating (17).

Claims

1.-16. (canceled)

17. A radial ventilator comprising: a base part, a housing part placed on the base part, a motor electronics unit, and an internal rotor electric motor; a ventilator wheel drive via a shaft of the electric motor; the motor electronics unit and a stator of the electric motor are encapsulated by an extrusion coating in the base part and together form an integral one-piece structural unit; the radial ventilator has a pressure chamber expanding in a spiral shape around the ventilator wheel, the pressure chamber is formed and defined by the housing part and the extrusion coating.

18. The radial ventilator as claimed in claim 17, wherein the extrusion coating comprises a protruding ring section extending in the axial direction, the axial end face of the ring section defines the pressure chamber and the ring section defines a receptacle chamber for the motor electronics unit.

19. The radial ventilator as claimed in claim 17, wherein the spiral-shaped pressure chamber is formed by an axial and radial expansion.

20. The radial ventilator as claimed in claim 17, wherein the housing part has a constant diameter delimiting the pressure chamber and a spiral shape of the pressure chamber is exclusively defined by the extrusion coating.

21. The radial ventilator as claimed in claim 17, wherein the electric motor is arranged on a first axial side of the motor electronics unit and the pressure chamber is arranged on a second axial side of the motor electronics unit, which is opposite to the first axial side.

22. The radial ventilator as claimed in claim 17, wherein the motor electronics unit is arranged on a printed circuit board and the printed circuit board is enclosed by the extrusion coating.

23. The radial ventilator as claimed in claim 17, wherein the base part has a cylindrical recess around a rotational axis for the shaft, in which a rotor of the electric motor fastened on the shaft is inserted.

24. The radial ventilator as claimed in claim 23, wherein the recess has a closed bottom, which is formed by the extrusion coating.

25. The radial ventilator as claimed in claim 23, wherein a ring-shaped flow divider enclosing the ventilator wheel is arranged radially adjoining the ventilator wheel, which forms a diffuser, which merges directly into the pressure chamber, together with the housing part around the ventilator wheel.

26. The radial ventilator as claimed in claim 25, wherein the flow divider rests on the extrusion coating.

27. The radial ventilator as claimed in claim 25, wherein the flow divider is formed as a sleeve which is inserted into the recess.

28. The radial ventilator as claimed in claim 25, wherein the flow divider protrudes in the radial direction at least in regions in relation to a radial inner wall surface of the extrusion coating and thus forms an axial surface of the pressure chamber.

29. The radial ventilator as claimed in claim 25, wherein the flow divider has a cup-like axial indentation, which has a diameter which essentially corresponds to an external diameter of the ventilator wheel, wherein the ventilator wheel is axially inserted in sections into the indentation.

30. The radial ventilator as claimed in claim 29, further comprising at least one bearing for mounting the shaft, wherein the at least one bearing is arranged between the flow divider and the shaft.

31. The radial ventilator as claimed in claim 25, wherein the flow divider has a rounding at least in sections on its free end facing toward the pressure chamber.

32. The radial ventilator as claimed in 18, wherein the axially protruding ring section of the extrusion coating has a circumferential axial projection on its radial outer edge section and presses against an inner wall surface of the housing part.

Description

DRAWINGS

[0027] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

[0028] FIG. 1 is a top plan view of a radial ventilator;

[0029] FIG. 2 is a sectional view along line B-B of FIG. 1;

[0030] FIG. 3 is a sectional view along line A-A of FIG. 1;

[0031] FIG. 4 is a perspective sectional view of the radial ventilator of FIG. 1.

DETAILED DESCRIPTION

[0032] An exemplary embodiment of a radial ventilator 1 according to the disclosure is shown in an axial top view, two sectional views A-A and B-B, and a perspective sectional view in FIGS. 1-4.

DETAILED DESCRIPTION

[0033] The radial ventilator 1 comprises an electric motor designed as an internal rotor motor having a rotor 22 and a stator 32, that interact in the manner of a containment shroud motor. The magnets of the rotor 22 are fastened on the shaft 7, that extends along the rotational axis RA axially through the radial ventilator 1. The ventilator wheel 3 designed as a radial ventilator wheel, is fixed on the shaft 7. In operation, the ventilator wheel 3 suctions in air axially via the inlet 69 and discharges it via the pressure nozzle 33 at the discharge 44 via its impeller blades.

[0034] The radial ventilator 1 has the base part 2 and the housing part 4 placed on the base part 2 that has the pressure nozzle 33, that defines the discharge 44. The base part 2 is an integral one-piece structural unit. The stator 32 of the electric motor, the printed circuit board 10, and the motor electronics components 98 fixed on the printed circuit board 10 for regulating the radial ventilator 1 are encapsulated by the one-piece plastic extrusion coating 17 of the base part 2. The cylindrical recess 92 is formed in the base part 2 around the rotational axis RA of the shaft 7. The shaft 7 and the rotor 22 of the electric motor, fastened thereon, are inserted into the recess 92 in such a way that the rotor 22 and stator 32 lie on one axial plane. The bottom 77 of the recess 92 is closed by the extrusion coating 17. The extrusion coating 17 forms the protruding ring section 11 extending in the axial direction in parallel to the rotational axis. The axial end face of the ring section 11, facing toward the housing part 4, defines the spiral-shaped pressure chamber D together with the housing part 4. The axial projection 18 is formed on the radial outside on the ring section 11, which forms a contact surface to the inner wall surface of the housing part 4. The axial end face of the ring section 11 is thus indented like a trough. At the same time, the ring section 11 forms a receptacle chamber located on the radial inside for the motor electronics unit 98, as may be seen well in FIG. 4.

[0035] The ring-shaped flow divider 8 enclosing the ventilator wheel 3 is arranged radially adjoining the ventilator wheel 3. The flow divider 8, together with the inner wall surface of the housing part 4, forms the diffuser 9 around the ventilator wheel 3. The inner wall surface of the outer part 4 and the flow divider 8 extend radially outward perpendicularly to the rotational axis RA in the region of the diffuser 9. The free end of the flow divider 8 forms the end of the diffuser 9 and has a rounding R. The diffuser 9 merges directly into the pressure chamber D. The spiral shape of the pressure chamber D is exclusively formed via the inner part 5 and, the housing part 4 having a constant diameter. It can be seen well with reference to FIGS. 2 to 4 that the pressure chamber D widens both axially and also radially due to the shaping of the ring section 11. The flow divider 8 protrudes in the radial direction in relation to the radial inner wall surface 87 of the inner part 5 and partially forms an upper-side axial surface of the pressure chamber D. The pressure chamber D is formed axially offset, but directly adjoining the diffuser 9. Thus, the flow generated by the ventilator wheel 3 flows tangentially out of the diffuser 9 into the pressure chamber D. The pressure nozzle 33 with the discharge 44 is formed in one piece on the outer part 4 in extension of the pressure chamber D. The pressure nozzle 33 has a round cross section.

[0036] The housing part 4 is sealed via a circumferential seal 25 in relation to the base part 2 on the radial outer wall surface of the ring section 11. Furthermore, a plug device 93, for plugging in a plug and contacting with the printed circuit board 10, is provided in one piece on the base part 2.

[0037] The electronics components 98 are arranged, extrusion coated by the extrusion coating 17, in the free space adjoining the pressure chamber D and thus facing toward the flow. Thus, a heat emission to the flow divider 8 and thus cooling take place.

[0038] The flow divider 8 rests on the ring section 11 and is formed as a sleeve. It has a cylindrical tube section inserted in the axial direction into the recess 92, that ends spaced apart from the rotor 22. The shaft 7 is mounted on the flow divider 8 via two bearings 19. The two bearings 19 are tensioned in the axial direction via the spring 21. Alternatively, the shaft 7 can also be mounted opposite to recess 92 in the base part 2. In addition, it is also possible to mount one of the bearings 19 opposite to the flow divider 8 and the second bearing 19 opposite to the base part 2.

[0039] On the side of the ventilator wheel 3, the flow divider 8 has a cup-like axial indentation 14, in which the ventilator wheel 3 is inserted with its bottom disc. Thus, the outlet of the ventilator wheel 3 and the surface of the adjoining flow divider 8 lie flush in one axial plane. The diameter of the indentation 14 is equal to the external diameter of the bottom disc of the ventilator wheel 3, so that an essentially gap-free transition is produced from the ventilator wheel 3 to the flow divider 8. A minimal gap of preferably 0.2-0.5 mm is provided to ensure the rotation of the ventilator wheel 3. Essentially gap-free herein means that the rotation of the ventilator wheel 3 in relation to the flow divider 8 is ensured.

[0040] The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.