ROTOR ASSEMBLY

Abstract

The disclosure relates to a high-speed radial fan and to a rotor assembly (10) for a high-speed radial fan, comprising a bearing tube (20) which is axially open in the interior and in which a shaft (40) carrying a fan wheel (30) is mounted with a rotor (50), wherein the rotor (50) of the rotor assembly (10) is mounted in a cylindrical separating can (3).

Claims

1. A rotor assembly (10) for a high-speed radial fan, comprising a bearing tube (20) which is axially open in the interior and in which a shaft (40) carrying a fan wheel (30) is mounted with a rotor (50), wherein the rotor (50) of the rotor assembly (10) is mounted in a cylindrical separating can (3).

2. The radial fan (1) with a rotor assembly (10) according to claim 1, characterized in that the radial fan has a fan housing (2), which is formed as a single piece with the separating can (3).

3. The radial fan (1) according to claim 1, characterized in that the bearing tube (20) with the shaft (40) and the rotor (50) mounted on the shaft (40) is arranged in the separating can (3), which is closed around the circumference.

4. The radial fan (1) according to claim 2, characterized in that the separating can (3) extends away from a substantially flat housing base plate (2a) of the fan housing (2) in the axial direction.

5. The radial fan (1) according to claim 1, characterized in that an air gap is formed between the rotor (50) and a stator (51) surrounding the rotor (50), and the separating can (3) with its cylindrical separating can walls (3a) is arranged within the air gap.

6. The radial fan (1) according to claim 1, characterized in that the material of the separating can (3) is an isolator or has a contact resistance greater than 10 Ohm.

7. The radial fan (1) according to claim 1, characterized in that the shaft (40), on a first bearing (24) arranged in the bearing tube (20) and a second bearing (25) arranged in the bearing tube (20) spaced apart in the axial direction as relates to the first, are mounted in a region between the fan wheel (30) and the rotor (50).

8. The radial fan (1) according to claim 1, characterized in that the rotor (50) has precisely 2 or precisely 4 poles.

9. The radial fan (1) according to claim 1, characterized in that the stator (51) is surrounded by a housing (52), which provides a receiving compartment for the stator (51) and preferably motor electronics installed in the receiving compartment, wherein the housing (52) is sealed off from the fan housing (2) and is connected thereto.

10. The radial fan (1) according to claim 1, characterized in that the bearing tube (20) with a radial overhang (21) rests upon a housing base plate (2a) and is connected to the fan housing (2) by means of a connection assembly, wherein the overhang (21) extends, at least partially, over an outer circumference (31) of the fan wheel (30).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other advantageous further embodiments of the disclosure are characterized in the dependent claims and/or are shown in more detail in the following by means of the figures, along with the description of the example embodiments of the disclosure. The following is shown:

[0028] FIG. 1 is a sectional view through an example embodiment of a rotor assembly;

[0029] FIG. 2 is a sectional view through an example embodiment of a radial fan;

[0030] FIG. 3 is a perspective sectional view through the example embodiment according to FIG. 2; and

[0031] FIGS. 4, 5, 6, 7 and 8 are further example embodiments of the disclosure.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

[0032] The example embodiments of the disclosure is described in more detail in the following with reference to FIGS. 1 to 8, wherein use of the same reference numerals indicates the same structural and/or functional features.

[0033] FIGS. 2 and 3 show an exemplary embodiment of a high-speed radial fan 1 having a rotor assembly 10.

[0034] The rotor assembly 10 comprises a bearing tube 20 which is open axially in the interior. A shaft 40 is mounted in the bearing tube 20, in which a rotor 50 of a canned motor is mounted on the shaft 40. An air gap is formed between the rotor 50 and a stator 51 surrounding the rotor 50, and the separating can with its cylindrical separating can walls 3a is arranged within the air gap. The motor stator 51, which is external in this respect, is then arranged in a housing 52. In this exemplary embodiment, the rotor 50 has precisely 2 poles.

[0035] The housing 52 forms a receiving compartment for the stator 51 and the motor electronics 55, in which the housing 52 is sealed off at sealing surfaces 56 as relates to the fan housing 2 and is connected thereto.

[0036] The bearing tube 20 has an overhang 21 which protrudes outwardly radially.

[0037] The sectional view according to FIG. 1 shows that the overhang 21 extends over the outer circumference 31 of the fan wheel 30. The overhang 21 is substantially formed as a round plate-shaped overhang, the diameter of which is greater than the diameter of the fan wheel 30.

[0038] The overhang 21 further has a collar 23, which extends outwardly circumferentially and protrudes upwardly, and which extends in the axial direction A and surrounds the radial edge region 32 of the fan wheel 30 radially outwardly. In other words, the fan wheel 30 is placed on the shaft 40 such that the fan wheel 30 is arranged in the overhang 21 in the recess.

[0039] The shaft 40 is mounted between two bearings 24, 25, in which a spring 28 is preloaded against the first bearing 24, which is supported on an inner bar 29. The second (lower bearing 25 in FIG. 1) is situated on the lower end of the bearing tube 20 and mounted flush with the bar 29. The shaft 40 with the rotor 50 protrudes through the lower bearing 25.

[0040] FIGS. 1 and 2 further show the fan housing 2. In this case, the bearing tube 20 with the shaft 40 and the rotor 50 mounted on the shaft 40 protrudes into a separating can 3 (open at the top) which is closed around the circumference, and which is part of the fan housing 2 of the radial fan 1 and is formed as a single piece therewith.

[0041] The separating can 3 of the housing 2 extends away from a substantially flat housing base plate 2a of the fan housing 2 in the axial direction. The bearing tube 20 is mounted with its radial overhang 21 on the housing base plate 2a and is connected to the fan housing 2 by means of a screw connection.

[0042] FIGS. 4 to 8 show further embodiments of the disclosure, in which particularly the design of the housing 2, of the separating can 3, of the bearing tube 20, and the design of the heat-dissipating section 23 are shown in an alternative form. The overhang of the separating can 3v which extends between an upper part and lower part of the housing 2 can also be seen. FIG. 9 further shows that an attachment opening is provided in the region of the heat-dissipating section 23 in order to attach the overhang of the bearing tube 20 to the overhang of the separating can 3.

[0043] The claimed invention is not limited in its design to the aforementioned example embodiments. Rather, a number of variants is conceivable, which would make use of the solution shown even with essentially different designs. Thus, the design of correspondingly application-specific scaling options could be adapted to the application, as previously explained.