阅读说明：本技术 具有冷却功能的转子安装单元 (Rotor mounting unit with cooling function ) 是由 V·埃勒斯 F·沃斯霍恩 于 2019-10-23 设计创作，主要内容包括：本发明涉及一种具有用于高速径流式通风机的集成式导热通道的转子组件(10),所述转子组件包括在内部轴向打开的轴承管(20),在所述轴承管中,承载通风机叶轮(30)的轴(40)借助屏蔽电动机的转子(50)支承在轴承(24、25)上,其中所述轴承管(20)具有向外突出的径向突出部(21),所述突出部至少部分地借助散热区段(23)在所述通风机叶轮(30)的外周(31)上延伸并且提供从所述轴承(24)延伸至所述散热区段(23)的集成式导热通道。(The invention relates to a rotor assembly (10) having an integrated heat conducting channel for a high-speed radial fan, comprising a bearing tube (20) which is open axially on the inside and in which a shaft (40) carrying a fan wheel (30) is supported on bearings (24, 25) by means of a rotor (50) of a canned motor, wherein the bearing tube (20) has an outwardly projecting radial projection (21) which extends at least partially by means of a heat dissipating section (23) on the outer circumference (31) of the fan wheel (30) and provides an integrated heat conducting channel which extends from the bearing (24) to the heat dissipating section (23).)

1. A rotor assembly (10) with an integrated heat conducting channel for a high-speed radial fan, comprising an internally axially open bearing tube (20) in which a shaft (40) carrying a fan wheel (30) is supported on bearings (24, 25) by means of a rotor (50) shielding an electric motor, wherein the bearing tube (20) has an outwardly protruding radial projection (21) which extends at least partially by means of a heat dissipating section (23) over an outer circumference (31) of the fan wheel (30) and provides an integrated heat conducting channel extending from the bearing (24) to the heat dissipating section (23).

2. The rotor assembly (10) according to claim 1, wherein the protrusions (21) are constructed as substantially circular plate-like protrusions having a diameter D_AIs greater than the diameter D of the fan wheel_V。

3. The rotor assembly (10) according to claim 1 or 2, wherein the projection (21) has an externally encircling flange (23) which extends in the axial direction and which at least partially or radially externally surrounds a radial edge region (32) of the ventilator wheel (30) over the entire circumferential extent.

4. The rotor assembly (10) according to one of the preceding claims, wherein the shaft (40) is supported in the region between the ventilator wheel (30) and the rotor (50) on a first bearing (24) arranged in the bearing tube (20) and a second bearing (25) arranged in the bearing tube (20) at a distance from the first bearing (24) in the axial direction, and the shaft (40) protrudes from the ventilator wheel (30) by means of an end section (44) for dissipating the heat into the ventilator housing (2).

5. Radial fan with a fan housing (2) in which a rotor assembly according to one of the preceding claims is mounted, wherein the fan housing (2) has a recess (2i), the heat dissipation section (23) of the bearing tube (20) protruding into the recess (2i) by means of a heat dissipation surface (23i) in such a way that, during operation of the fan, the medium flow required by the fan wheel flows along the heat dissipation surface (23i), so that a heat sink is formed on the heat dissipation surface (23i) relative to the bearing (24, 25).

6. A radial fan according to claim 5, characterised in that the recess (2i) is located at least partially in a radially outer flow channel (2s) of the fan housing (2).

7. Radial fan according to claim 5 or 6, characterized in that an axial section of the bearing tube (20) directly accommodates the bearing (24, 25) and that around this axial section a cylindrical housing section (2z) of the fan housing (2) surrounds the axial section of the bearing tube (20).

8. A radial fan according to claim 7, characterised in that a circumferentially closed spacer sleeve (3) connects the cylindrical housing sections (2 z).

9. A radial fan according to claim 8, wherein the spacer sleeve (3) is integrally formed with the fan housing (2).

10. Radial fan according to one of claims 5 to 9, characterized in that the bearing tube (20) rests with its radial projection (21) flat on a housing base plate (2a) of the fan housing (2).

Technical Field

The invention relates to a rotor assembly with a fan wheel and a radial fan with such a rotor assembly, which has an integrated cooling function.

Background

A problem with radial fans is that, due to mechanical friction, heat is generated in the bearings of the rotor shaft, which can lead to overheating. This problem is particularly relevant in the case of radial fans for high-speed applications, which are intended to be installed in an axially one-piece insulating sleeve closed on one side, since the heat transfer to the outside is also prevented there by this insulating sleeve.

In the present invention, the high speed applications are the rotational speeds of the ventilator wheel at which the circumferential speed at the outlet of the radial compressor is at least 60 m/s. This exacerbates the thermal problem because as the rotational speed increases, additional heat is inevitably generated.

In some examples of applications, the housing of the high speed fan is made of metal. This achieves cooling and facilitates heat dissipation through the thermally conductive housing wall. In the case of large or stable high speed fans, more costly oil or water cooling may alternatively be used. If a medium is available for cooling, the area to be cooled is circulated by the medium.

If the housing is made entirely of metal, the disadvantage is that only limited shaping and joining techniques can be used. The use of plastic for the main housing of the ventilator allows a higher degree of freedom of shape and alternative joining methods can be used, but in this case the heat transfer effect is not ideal.

This requires high design costs and additional equipment when the cooling of the bearings is achieved by an auxiliary medium such as oil or water.

Disclosure of Invention

It is therefore an object of the present invention to overcome the above disadvantages and to provide a rotor assembly for a radial fan, in particular a high-speed radial fan, which provides an optimized cooling solution for bearing cooling.

The solution of the invention to achieve the object described above is characterized by the combination of features of claim 1.

According to the invention, a rotor assembly with an integrated heat conducting channel for a high-speed radial fan is proposed, comprising a bearing tube which is open axially on the inside and in which a shaft carrying a fan wheel is supported on a bearing by means of a rotor of a canned motor, wherein the bearing tube has an outwardly projecting radial projection which extends at least partially by means of a heat dissipating section on the outer circumference of the fan wheel and provides an integrated heat conducting channel which extends from the bearing to the heat dissipating section.

The larger diameter region of this projection extends over the diameter of the fan wheel (radial or diagonal configuration). This ensures that the air flow of the fan wheel sweeps over the edge region of the enlarged diameter section of the bearing tube.

This produces a heat sink by coupling the medium flow to the fan wheel. The heat generated in the rotor system is mostly dissipated by heat conduction. In order to make this effect work, the material of the protruding heat dissipation section needs to have a thermal conductivity of at least 1W/m K. However, it does not matter whether the heat dissipating section is made of the same part or material as the bearing tube itself. Thus, this structure may be formed in different ways, i.e. in one piece, in multiple pieces or in a composite manner.

In the case of radial fans, leakage currents are also practical, which are located below the fan wheel, which leakage currents also contribute to heat dissipation.

If a relatively narrow flange is used as the heat sink section, leakage current located below the impeller can be used as a cooling device.

In an advantageous embodiment of the invention, the projection is designed essentially as a single pieceUpper circular plate-like projection of diameter D_ALarger than the diameter D of the impeller of the ventilator_V。

It is further advantageous if the projection has an externally circumferential collar which extends in the axial direction and which surrounds the radial edge region of the fan wheel at least partially or radially on the outside over the entire circumference.

A particularly advantageous solution is that the shaft is supported in the region between the fan wheel and the rotor on a first bearing arranged in the bearing tube and a second bearing arranged in the bearing tube at a distance from the first bearing in the axial direction, and that the shaft protrudes with an end section from the fan wheel for dissipating heat into this fan housing. This achieves a further heat dissipation channel in the shaft, and the end sections of the shaft form heat sinks. The medium flow sucked in axially by the fan, for example the sucked-in air, therefore flows along the end section of this shaft and is subsequently guided into the radial flow channels.

Another aspect of the invention relates to a radial fan with a fan housing in which a rotor assembly as described above is mounted, wherein the fan housing has a recess, into which the heat dissipation section of the bearing tube projects or adjoins in a manner intended by means of a heat dissipation surface, such that during operation of the fan the medium flow required by the fan wheel flows along the heat dissipation surface, forming a heat sink on the heat dissipation surface relative to the bearing. In this way, heat transfer from the two bearings via the bearing tubes to the heat dissipation surfaces on the flanges of the projections is achieved, whereby heat dissipation can be carried out in a targeted manner.

In a further advantageous embodiment of the invention, the recess is located at least partially in a radially outer flow channel of the fan housing.

The axial section of the bearing tube preferably accommodates the bearings directly, and the cylindrical housing section of the ventilator housing surrounds the axial section of the bearing tube.

It is further advantageous if a circumferentially closed insulating sleeve (directly) connects the cylindrical housing sections, and it is further preferred if the insulating sleeve is integrally formed with the ventilator housing.

In addition, a particularly advantageous solution is that the bearing tube rests with its radial projection flat on a housing base plate of the fan housing. Thus, in addition to ease of installation, greater bearing tube heat capacity can be achieved based on planar coupling and heat dissipation.

Drawings

Further advantageous further developments of the invention are indicated in the dependent claims, which will be explained in more detail below with reference to the drawings in conjunction with the description of preferred embodiments of the invention. Wherein:

figure 1 is a side cross-sectional view of one embodiment of a rotor assembly,

figure 2 is a side sectional view of one embodiment of a radial fan,

figure 3 is a perspective cross-sectional view of the radial fan of figure 2,

figure 4 is a top view of the embodiment according to figure 1,

fig. 5 to 9 show other embodiments of the present invention.

Detailed Description

The present invention is described in detail below with reference to fig. 1-9, wherein like reference numerals represent like structural and/or functional features.

Fig. 1 illustrates one embodiment of a rotor assembly 10.

The rotor assembly 10 is suitable for use with high speed radial fans. The rotor assembly 10 includes a bearing tube 20 that is axially open on the inside. A shaft 40 is mounted in the bearing tube 20, wherein a rotor 50 of a canned motor is mounted on the shaft 40. The external stator 51 of this motor is shown in fig. 2 and 3. The bearing tube 20 has a radial projection 21 projecting outwards.

The projection 21 extends with the aid of the heat dissipation section 23 on the outer circumference 31 of the ventilator wheel 30 and provides an integrated heat conduction channel 20 extending from the bearing 24 to the heat dissipation section 23. For this purpose, the material must have a satisfactory thermal conductivity to be able to transmit the heat flow that occurs.

As can be seen clearly in the sectional view according to fig. 2 and in the perspective sectional view shown in fig. 2, the projection 21 extends over the outer circumference 31 of the ventilator wheel 30. The projection 21 is designed essentially as a circular plate-shaped projection, the diameter D of which_ALarger than the diameter D of the ventilator wheel 30_V。

The projection 21 also has an externally circumferential, upwardly projecting collar 23 which extends in the axial direction a and radially outwardly surrounds a radial edge region 32 of the fan wheel 30. In other words, the ventilator wheel 30 is placed on the shaft 40 in such a way that the ventilator wheel 30 is arranged in the recess of the protrusion 21.

As shown in fig. 3, the edge region 26 of the projection 21, which is located radially outside the ventilator wheel 30, has three fastening openings 27. As shown in fig. 2, the entire rotor assembly 10 can be fastened to the ventilator housing 2 of the radial fan by means of fastening openings 27. In this case, the three fixing openings 27 are arranged in the circumferential flange 23.

The shaft 40 is supported between the two bearings 24, 25, wherein the spring 28 is preloaded against the first bearing 24, this spring being supported on the inner collar connecting plate 29. A second bearing (lower bearing 25 in fig. 3) is located on the lower end of the bearing tube 20 and is supported relative to the collar web 29. The shaft 40 protrudes through the lower bearing 25 by means of the rotor 50.

In fig. 2, the ventilator housing 2 is also shown. The bearing tube 20 rests with its radial projection 21 on the housing base plate 2a and is connected to the ventilator housing 2 by means of a screw connection. The bearing tube 20 also projects with the shaft 40 and the rotor 50 supported on the shaft 40 into a circumferentially closed (top-open) insulating sleeve 3, which is part of the ventilator housing 2 of a radial fan (only partially illustrated) and is integrally formed with this insulating sleeve.

The shaft 40 projects with an end section 44 from the fan wheel 30 for dissipating heat into the fan housing 2. This fan housing has a recess 2i, and the heat dissipation section 23 of the bearing tube 20 projects with its heat dissipation surface 23i into the recess 2 i. The heat radiating surface 23i forms a heat sink with respect to the bearings 24, 25.

As can be seen clearly in fig. 2, the groove 2i is located in a radially outer flow channel 2s of the fan housing 2.

Fig. 5 to 9 show further embodiments of the invention, in which in particular the design of the housing 2, the insulating sleeve 3, the bearing tube 20 and the design of the heat dissipation section 23 are realized in alternative forms. The projection of the insulating sleeve 3v extending between the upper housing part and the lower housing part of the housing 2 can also be seen. In fig. 9, it can also be seen that a fastening opening is provided in the region of the heat dissipation section 23 in order to fasten the projection of the bearing tube 20 to the projection of the insulating tube 3.

The embodiments of the invention are not limited to the preferred examples given above. Rather, a plurality of variants can be used, which can be used even in the case of facts that differ in principle. The illustrated grooves 2i can therefore also be constructed as a plurality of openings or bores juxtaposed to one another in the ventilator housing in this region.