EP3835589A1 - Electric motor device with an electric motor and an integral fan device - Google Patents

Abstract

The present invention relates to an electric motor device (1) with an electric motor (2) and an integral fan device, which has a fan wheel (4), which is mounted at one axial end of the electric motor (2) on its motor axis (3), and a fan housing ( 8, 13), which surrounds a motor housing (9) receiving the electric motor (2) on the outside in a jacket-like manner and which forms an annular gap (19) carrying a gaseous fluid between itself and the motor housing (9), which is formed by rib-shaped, circumferentially spaced and Axially extending flow guiding elements (21) are subdivided, which are each curved claw-like in the circumferential direction at their inlet-side end sections (23), the motor housing (9) having a teardrop-shaped axially extending outer contour with an inlet section (17) that rounds radially outward , which at its downstream end, preferably flowing without a straight cylindrical intermediate piece , merges into a preferably conically tapering outlet section (18), and the annular gap (19) radially outwardly bounded by an inner contour (11), preferably of the fan housing (8, 13), extending axially around the motor housing (9) in a teardrop shape is.

Description

The present invention relates to an electric motor device with an electric motor and an integral fan device, which has a fan wheel which is mounted at one axial end of the electric motor on its motor axis, and a fan housing which on the outside surrounds a motor housing receiving the electric motor and which between itself and the motor housing forms a gaseous fluid, in particular air, leading annular gap which is divided by rib-shaped, circumferentially spaced and axially extending flow guide elements.

State of the art

Known machines, in particular medical technology machines, which are subject to high requirements in terms of sterilizability and safety, develop heat during operation which can accumulate in an associated machine housing. Because of this, the machine housings mostly have fans, compressors or blower devices (e.g. cooling fans) operated by an electric motor in order to cool the inside of the housing and possibly also the electric motor itself. Other conceivable applications are, for example, suction devices or ventilators.

In general, axial fans or flat fans are used for ventilation applications, in which air is blown out in the axial direction and which achieve high volume flows but only a low pressure build-up. The radial space requirement, especially of flat fans, can be disadvantageous. For applications in which a higher pressure build-up is required, such as when conveying Gaseous media in technical devices (e.g. suction devices, ventilation devices, etc.), from which there is a high air resistance due to built-in filters and the like, are mostly used radial fans in which the air is blown off in a radial direction. Radial fans achieve high pressures, but also a very limited volume flow in relation to their size, and usually have no or very little active self-cooling. In addition, due to the radial air blow-off, they are complex to install and generate a lot of noise.

It is also off EP 3 141 757 A1 a fan is known which has an electric motor, on the motor axis of which a fan wheel with spiral fan blades is attached in order to suck in air through a proximal inlet cover of a fan housing that widens radially in the direction of flow. The air is then diverted through a diffuser, the guide vanes of which are curved in the circumferential direction at their proximal end, flows on between the fan housing and the radially outer, wing-shaped flow guide elements of a sleeve for accommodating the electric motor and is finally attached to a distal outlet cover that narrows radially in the flow direction axially diverted. The air routing within this fan is disadvantageous, for example due to an abrupt diversion of air at the flow guide elements and / or a course or structure of a flow cross section along the flow direction. As a result, this fan is likely to generate a lot of noise and disadvantageous flow conditions, which is why an achievable volume flow is probably not sufficient for many applications, which makes it difficult, for example, to ventilate the housing sufficiently, and moreover disadvantages with regard to self-cooling can occur. In addition, an achievable energy efficiency is low.

Summary of the invention

The object on which the present invention is based is to improve or eliminate disadvantages of the prior art. In particular, an electric motor device with an electric motor and an integral Blower device (for example a compressor or fan) can be provided, which improves the disadvantages of conventional fans, in particular can achieve high pressure ratios and volume flows at the same time, and / or which is energy-efficient and achieves adequate self-cooling. In particular, the electric motor device should also be inexpensive and easy to assemble and maintain.

The object on which the invention is based is achieved by a pressure measuring arrangement having the features of claim 1. Advantageous refinements are the subject matter of the subclaims and will be described in more detail later.

More precisely, the object on which the invention is based is achieved by an electric motor device with an electric motor and an integral fan device (compressor / fan), which has a fan wheel which is mounted on one axial end of the electric motor on its motor axis, and a fan housing which a motor housing accommodating the electric motor surrounds the outside in a jacket-like manner and which between itself and the motor housing forms an annular gap carrying a gas (ie a gaseous fluid, in particular air), which is formed by rib-shaped, circumferentially spaced and axially extending flow guide elements (air / gas guide elements ), which are each claw-like curved in the circumferential direction at their inlet-side end sections, wherein the motor housing has a teardrop-shaped axially extending outer contour (outer surface) with a radially outwardly rounded (air / gas) inlet section, which at se In a downstream end, preferably flowing without a straight cylindrical intermediate piece, merges into a preferably conically tapering (air / gas) outlet section, and the annular gap radially outwards through an inner contour (inner surface), preferably of the fan housing, extending axially around the motor housing in a teardrop shape , is limited. The inner contour extends conically at least up to a downstream end of the flow guide elements.

In other words, an electric motor device according to the invention has a motor which is accommodated in a motor housing and which drives a fan wheel mounted on the motor axis. An assembly consisting of the motor housing, the electric motor and the fan wheel is accommodated in a fan housing which defines an annular gap between itself and the motor housing, the diameter of which (that is, both an outer diameter and an inner diameter of the annular gap) initially along a convexly curved inlet section of the motor housing increases and then decreases conically along an outlet portion of the motor housing. The annular gap is subdivided in the circumferential direction by flow guide elements which are curved in a claw-like manner at their inlet-side end sections. The electric motor device according to the invention makes it possible to achieve both high volume flows and a high pressure build-up (at preferably relatively high flow speeds) due to its advantageous flow guidance and is therefore particularly suitable for applications in which both high volume flows are required and a high pressure build-up is required such as ventilation of the housings of medical technology machines, in suction devices, ventilators and the like. In addition, good active self-cooling and / or housing cooling can be achieved.

Because the diameter of the annular gap becomes smaller along the outlet section, a flow cross section is also reduced, which is why a throttling effect is generated in the axial region of the outlet section. This accelerates the flow along the motor housing, which among other things leads to improved self-cooling. In particular, a width or width of the annular gap in the radial direction in the axial area of the inlet section and / or in the axial area of the outlet section is essentially constant along the axial direction. Alternatively, the width can also increase, provided that it is ensured that the teardrop-shaped inner contour has a conically tapering area. Radially outwardly facing end flanks of the flow guide elements preferably rest on the axially teardrop-shaped inner contour or inner surface and thus likewise define a corresponding teardrop-shaped contour. Alternatively, the inner contour or inner surface can be designed in such a way that it engages in a comb-like manner between the flow guide elements and thus delimits the annular gap radially outward. The outer contour and / or the inner contour can be interrupted in the conically tapering area by a cylindrical section.

The fan housing is preferably multi-part for assembly purposes, preferably in two parts with a main body and a cover or in three parts with a main body provided at both ends with a cover, the cover also forming an inlet connector and / or an outlet connector. Alternatively, the fan housing can also be divided along a longitudinal sectional plane and have two longitudinally divided housing halves. In particular, it is advantageous if the fan housing forms a cup-like (trumpet-like widening) cover at an upstream or front end which forms the inlet connection. The fan wheel can also be rotatably received in the cover in such a way that part of the annular gap carrying a gaseous fluid or air is formed between the fan wheel and the fan housing. This part of the annular gap is subdivided in the circumferential direction by spiral-like drive blades of the fan wheel, which drive a gas (e.g. air, oxygen, etc.) and suck it through the inlet connection into the fan housing when the electric motor drives the fan wheel.

The inner contour is preferably entirely or partially formed by the main body of the fan housing, but can additionally or alternatively be entirely or partially formed by the cover, can additionally or alternatively be entirely or partially formed by a separate sleeve component or can alternatively be entirely or partially formed by the two Longitudinally divided housing halves are formed. According to a further preferred aspect, recesses or gaps are formed at a transition of the housing parts, in particular between the main body and the inlet connector. In the assembled state, at least one hook-like projection optionally formed radially on the outside on at least one of the flow guiding elements engages in the corresponding recess or gap in order to move against an assembly direction, i.e. in a direction from which the flow guiding elements (the motor housing with the thereon formed Flow guide elements) were inserted into the fan housing to support in the gap. The at least one hook-like projection is preferably on one for better assembly Axial region of a maximum annular gap diameter or at an inlet end of a corresponding flow guide element, which will be described in more detail later, is provided. Preferably, the motor housing is also fastened by gluing or the like in the fan housing and the hook-like projection serves as a redundant fuse in order to prevent the assembly with the motor housing, the motor and the Fan wheel moved in the upstream direction in such a way that the rotating fan wheel comes into contact with the static inlet nozzle and is damaged.

It is further preferred that the outwardly rounded inlet section defines or reaches a maximum motor housing diameter. In particular, the flow guide elements start at an axial position at which this maximum motor housing diameter is reached (ie inlet ends of the flow guide elements are arranged at the maximum motor housing diameter) or place the flow guide elements with their inlet end at an axial position which is upstream by a certain axial distance or by a certain axial distance is offset downstream from the maximum motor housing diameter. In particular, an intermediate space is formed in the axial and / or radial direction between an outlet of the drive blades of the fan wheel and a shoulder of the flow guide elements. A length in the flow direction of the intermediate space is determined in particular by the air inlet section. In the area of the intermediate space, the annular gap can optionally be wider than in its remaining course. A contour of the annular gap in the area of the gap follows in particular an oval or circular section (in particular a quarter or a circular or oval section of an angle of 90 ° +/- 10 ° between the ends of the drive blades and the approaches of the flow guide elements). The gap in the axial direction takes in particular 5 to 20%, preferably 7 to 15%, of the axial length of the motor housing (from an upstream edge or end face to a downstream edge or end face). This enables a flow (gas / air flow), which is accelerated by the drive blades in the axial and circumferential directions, to slow down in the space and thus be diverted particularly gently / without turbulence through the flow guide elements. The air (the gaseous fluid) flowing through the electric motor device becomes accelerated again especially when passing through the flow guide elements, where a flow cross section narrows. The flow guide elements are wholly or partially integrally formed with the motor housing, but can alternatively or additionally be wholly or partially integrally formed with the inner contour, in particular with the fan housing, or can alternatively or additionally be provided as a separate component. In particular, the flow guide elements can be in several parts, so that, for example, an upstream or front part is made in one piece with the motor housing and a downstream or rear part is made in one piece with the fan housing.

In addition, it has proven to be useful that the claw-like curved inlet-side end sections have at least one third, preferably up to two thirds, of the flow guide elements. As a result, the flow (of the gaseous fluid or gas, e.g. air) can be redirected uniformly and less noise is generated during the redirection. Soundproofing of the electric motor device when it is installed in a housing can thus be largely dispensed with. The curved end sections on the inlet side preferably have 40% to 60%, more preferably half, of the flow guide elements. It is also advantageous if the flow guide elements have outlet-side end sections which run preferably linearly, more preferably (exclusively) in the axial direction (i.e. lying in a plane with a central axis of the electric motor device) and in particular tangentially connected to the inlet-side end sections or directly next to them and are arranged tangential to it. As a result, the (gas / air) flow diverted through the inlet-side end sections is uniformly directed into a straight path in which it emerges from the flow guide elements. The outlet-side end sections can also run completely or partially in a straight cylinder, in particular if they are formed by a section of the fan housing.

Furthermore, the inlet ends of the flow guide elements preferably form inlet edges which taper at an acute angle and which lie in a cross-sectional plane of the motor housing. This creates an upstream of the flow guide elements (Gas / air) flow cut through the inlet edges and introduced evenly between the flow guide elements. An obtuse inlet angle of preferably 120 ° to 150 °, more preferably of 130 ° to 140 °, preferably opens between each of the inlet edges and a motor housing circumference (ie with respect to a corresponding tangential line) on which the inlet edge is arranged. Or in other words, an angle of preferably 30 ° to 60 °, more preferably 40 ° to 50 °, is formed between the inlet edge and a radial line running through the starting point of the inlet edge. That is, side flanks of the flow guide elements pointing in the circumferential direction are at least in the axial area of the inlet section, not at right angles to the outer surface or outer contour of the motor housing, but are arranged thereon in such a way that between a side flank that is inner (concave) with regard to the claw-like curvature and the corresponding circumference an obtuse angle is formed on the outer surface. This obtuse angle can change, in particular decrease, in the axial course of the flow guide element and, at a downstream end of the inlet section, correspond to an angle between the corresponding side flank of the linearly extending outlet section and the circumference of the outer surface of the motor housing. This angle, in particular the outlet angle, of the outlet section is preferably between 80 ° and 100 °, more preferably 90 °.

The flow guide elements are expediently designed in such a way that they are indeed bent or curved, but are untwisted or untwisted, ie not twisted, along their axial extension. So you don't screw yourself around the motor housing, but simply bend around it or along it. In other words, the upstream inlet edges of the flow guide elements run parallel to the respective downstream outlet ends, preferably outlet-side end sections, of the flow guide elements. In particular, the side flanks of each flow guide element are always (everywhere) perpendicular to a longitudinal sectional surface of the motor housing, which is preferably perpendicular to the downstream outlet end of the respective flow guide element. In other words, the side flanks at each position are perpendicular to a longitudinal sectional plane which runs offset by 90 ° in the circumferential direction to the outlet end of the corresponding flow guide element. The outlet ends thus extend (exclusively) in the radial direction from the motor housing or project (exclusively) radially outward. In yet other words, each line of the side flanks lying in any cross-sectional area of the motor housing is parallel to the respective inlet edge and the respective outlet ends.

It is advantageous if the flow guide elements at an axial position along the outlet section form a radially outwardly protruding, nose-like projection which, in the assembled state, engages in corresponding recesses in the inner contour or inner surface, thereby opening the motor housing with respect to the inner contour or inner surface at least in the circumferential direction , preferably also in the downstream or upstream direction, is to be fixed in position. This in particular simplifies assembly of the electric motor device according to the invention.

The axially drop-shaped inner contour or inner surface, in particular of the fan housing, preferably extends in a conically tapering manner beyond a downstream end of the motor housing and ends in an outlet nozzle, the diameter of which is in particular smaller than a diameter of the annular gap at the downstream end of the motor housing.

It has proven to be advantageous that five to thirty, preferably six to sixteen, more preferably eight to twelve, more preferably ten flow guide elements are provided. Furthermore, the claw-like curved end sections of the flow guide elements preferably extend in such a way that the flow guide elements do not overlap one another in the circumferential direction. In other words, each flow guide element extends in the annular gap in an angular range which corresponds at most (preferably precisely) to an angle of 360 ° divided by the number of flow guide elements. The number of flow guide elements depends in particular on the dimensions of the electric motor device. In particular, the more flow guide elements and / or drive blades can be provided, the larger the electric motor device or the larger a circumference of the annular gap and / or the motor housing and / or the fan housing. Furthermore, the Flow guiding elements, in particular in the case of very large electric motor devices, need not necessarily be provided in an angular range described above (ie the flow guiding elements can overlap in the circumferential direction) in order to enable a large curvature of the claw-like inlet-side end sections.

According to a further preferred aspect of the invention, in one of the flow guiding elements, preferably on an outlet section, preferably in the corresponding nose-like projection and / or in a curvature on a downstream end face of the motor housing, a cable duct extending obliquely radially outwards and possibly downstream is formed which connects a motor receiving space within the motor housing to a through opening of the fan housing in order to provide a cable bushing for actuation / control / energy supply of the electric motor. The corresponding flow guide element can optionally be made wider than the other flow guide elements. This represents a simple cabling option that does not interfere with an (air / gas) flow within the fan housing. In this case, the fan housing preferably forms (on a radial outer side) an electronics receiving space for receiving an electronic device for controlling the electric motor, which is preferably accessible on a downstream end face of the fan housing and is preferably at least partially closable or closed by a cover. In particular, the electronics receiving space is delimited radially inward by a conically tapering surface and radially outwardly by an essentially (partially) cylindrical or, compared to the inner surface or inner contour, very slightly conical fan housing outer surface. Alternatively or in addition, the fan housing has axially extending cooling ribs on the outside, the radially outer end faces of which preferably define an essentially (partially) cylindrical outer contour of the fan housing. This further improves a cooling performance of the electric motor device.

Figure description

• Fig. 1 zeigt eine Längsschnittsansicht der erfindungsgemäßen Elektromotorvorrichtung nach einer ersten Ausführungsform der Erfindung.
• Fig. 2 zeigt eine Explosionsansicht der Elektromotorvorrichtung nach der ersten Ausführungsform.
• Fig. 3 zeigt eine Seitenansicht eines Motorgehäuses nach der ersten Ausführungsform.
• Fig. 4 und Fig. 5 zeigen Detailansichten eines Strömungsleitelements nach der ersten Ausführungsform.
• Fig. 6 zeigt eine Ansicht des Motorgehäuses nach der ersten Ausführungsform aus einer stromabwärtigen Richtung.
• Fig. 7 zeigt eine perspektivische Ansicht eines Hauptkörpers eines Gebläsegehäuses der ersten Ausführungsform.
• Fig. 8 zeigt eine Ansicht des Gebläsegehäuses nach der ersten Ausführungsform aus einer stromabwärtigen Richtung.
• Fig. 9 veranschaulicht die Strömungen innerhalb der Elektromotorvorrichtung der ersten Ausführungsform anhand einer Teilschnittansicht.
• Fig. 10 zeigt eine perspektivische Teilschnittansicht einer Elektromotorvorrichtung nach einer zweiten Ausführungsform.
• Fig. 11 zeigt eine perspektivische Teilschnittansicht einer Elektromotorvorrichtung nach einer dritten Ausführungsform.

The present invention is described below on the basis of preferred embodiments. However, these are illustrative in nature and are not intended to limit the scope of the present invention. Furthermore, in the description of the various embodiments, the same reference symbols are used for the same components in order to avoid redundant descriptions of the same.

• Fig. 1 shows a longitudinal sectional view of the electric motor device according to the invention according to a first embodiment of the invention.
• Fig. 2 Fig. 13 is an exploded view of the electric motor device according to the first embodiment.
• Fig. 3 Fig. 13 shows a side view of a motor housing according to the first embodiment.
• FIGS. 4 and 5 show detailed views of a flow guide element according to the first embodiment.
• Fig. 6 Fig. 13 is a view of the motor case according to the first embodiment from a downstream direction.
• Fig. 7 Fig. 13 is a perspective view of a main body of a fan housing of the first embodiment.
• Fig. 8 Fig. 13 is a view of the fan housing according to the first embodiment from a downstream direction.
• Fig. 9 illustrates the flows within the electric motor device of the first embodiment based on a partial sectional view.
• Fig. 10 Fig. 13 shows a perspective partial sectional view of an electric motor device according to a second embodiment.
• Fig. 11 Fig. 13 shows a perspective partial sectional view of an electric motor device according to a third embodiment.

In Fig. 1 shows a first embodiment of an electric motor device 1 according to the invention with an electric motor 2 and an integral fan device. The electric motor 2 is only shown schematically here and has a radially outer stator and a radially inner rotor which is connected to a motor axis 3. The motor axis 3 protrudes from the stator as an output shaft along an axial direction or central axis of the electric motor device 1 on a front or upstream side (viewed in the direction of flow) as an output shaft and serves as a seat for a fan wheel 4, which is attached to it in a rotationally fixed manner, e.g. screwed, and through the motor 3 is driven. The fan wheel 4 has a funnel-like base body 5 which widens in a funnel-like manner in the downstream direction. On the outer surface of the base body 5, drive blades 6, which are formed in one piece and run spirally around the base body 5, are provided on the outer surface of the base body 5, via which air or a gaseous fluid is driven in the operation described in more detail below / is accelerated.

An outer contour of the fan wheel 4 that is spanned or defined by the drive blades 6 also widens in a funnel-like manner in the downstream direction, with the width or drive blades 6 correspondingly decreasing, or in other words, with a radial width of flow channels formed between the drive blades 6 expanding in the downstream direction decreased. The flow channels between the drive blades 6 are delimited to the outside by a fan housing, in particular by a cup-like inlet connector 8 defining an inlet opening 7 (for air or the gaseous fluid). There is preferably only a small one between the drive blades 6 and an inner circumferential surface of the inlet connector 8 , to ensure free rotation of the fan wheel 4 in the inlet port 8 necessary gap is provided.

Downstream of the fan wheel 4 there is a static (non-driven) motor housing 9 with a motor receiving space 10 which opens towards the front and is designed as a blind hole. The electric motor 2 is received in the motor receiving space 10 in such a way that its motor axis 3 protrudes therefrom. The motor receiving space 10 extends almost through the entire motor housing 9, so that only a thin floor is formed at a downstream end, a gap remaining between the floor and the inserted electric motor 2 in order to provide space for cable connections. In this thin base, a bulge extending radially outward is provided, which forms a cable duct 11 running obliquely radially outward and in the direction downstream. The cable duct 11 connects the motor receiving space 10 with a radial outer surface or outer contour of the motor housing 9. An edge of a corresponding opening of the cable duct 11 in the radial outer surface rests on an inner surface or inner contour 11 of the fan housing, in particular a main body 13 of the fan housing, and is flush with it a through opening provided therein. The through opening connects the inner surface or inner contour 11 with an electronics receiving space 14 provided in the main body 13, which is provided between the inner surface or inner contour 11 and an outer surface of the fan housing or the main body 13. The electronics receiving space 14 opens in a downstream end face of the fan housing or the main body 13, where it can be equipped with an electronic device, for example, and can be at least partially closed by a receiving space cover 15. The receiving space cover 15 can have an opening for cable feed-through or the like.

In an upstream end face of the motor housing 9, around the motor receiving space 10, a recess is provided which defines an upstream outer edge 16 of the outer contour or the outer surface (ie a boundary between the upstream end face and the outer contour of the motor housing 9). A downstream end of the fan wheel 4 is received in the recess so that it can rotate freely about the motor axis 3 such that the upstream outer edge 16 lies next to the downstream end of the outer surface of the fan wheel 4 that a transition between the outer surface The base body 5 of the fan wheel 4 and the outer surface of the motor housing 9 is almost fluid, more precisely, has only a small shoulder and / or gap and / or angular deviation (ie, a similar orientation or an obtuse angle between 90 ° and 180 ° , preferably between 110 ° and 160 °, in particular 135 ° +/- 10 ° to each other). In this way, an (air / gas) flow is redirected uniformly at the transition between the fan wheel 4 and the motor housing 9.

The outer surface or outer contour of the motor housing 9 is shaped like a teardrop in a rotationally symmetrical manner about the central axis. In other words, the outer contour is bulged outwardly at its inlet section 17 arranged upstream and tapered conically in the axial direction at its downstream outlet section 18. The inlet section 17 defines or reaches a maximum outer diameter of the outer contour of the motor housing 9.

The inner surface or an inner contour 11 of the fan housing is formed in a region in which the motor housing 9 is arranged, around the central axis, rotationally symmetrical, teardrop-shaped, that an annular gap 19 is formed between the outer contour of the motor housing 9 and the inner contour 11 of the fan housing, which is preferably has a uniform width. That is, the inner contour 11 of the fan housing in the axial area of the motor housing 9 and the outer contour of the motor housing 9 run essentially parallel to one another. Or, in other words, the inner surface or inner contour 11 is curved concavely outward at an area radially opposite the inlet section 17 and tapers conically at an area opposite the outlet section 18. The conically tapering part of the inner surface or inner contour 11 extends beyond the axial region of the motor housing 9 and opens downstream in an outlet connection 20 formed by the main body 13.

The annular gap 19 is subdivided by a plurality of flow guide elements 21 distributed evenly around the motor housing 9 in the circumferential direction. More precisely, between the flow guide elements 21 as well as radially inward and outward, correspondingly limited by the motor housing 9 and the fan housing, separate flow channels are defined. These will be referenced later on FIGS. 3 to 6 described in more detail.

Fig. 2 FIG. 13 shows an exploded view of the first embodiment of the present invention, which particularly illustrates an assembly process of the electric motor device 1. In the present electric motor device 1, a cable harness with one or more cables (not shown) for actuating or controlling the electric motor 2 is first passed into the electronics receiving space 14, through the cable duct 12 and through the motor receiving space 10 and connected to the electric motor 2. The electric motor 2 is then inserted into the motor receiving space 10 of the motor housing 9 from the upstream direction in such a way that the cable harness can be accommodated in the gap between the electric motor 2 and the floor of the motor receiving space 10 or is not kinked or squeezed, and in such a way that the motor axis 3 protrudes from the opening of the motor receiving space 10 on the upstream side. The electric motor 2 can also be screwed, glued or the like. are fixed in the motor receiving space 10 in a rotationally and / or axially fixed manner.

The fan wheel 4 is mounted on the motor shaft 3 in a rotationally and axially fixed manner, so that its downstream end is received in the recess of the motor housing 9 around the opening of the motor receiving space 10. An alignment of the drive blades 6 of the fan wheel 4 and an alignment of the flow guide elements 21 with regard to their course around the central axis are opposite to one another. That is, the drive blades 6 of the fan wheel 4 run spirally in a first circumferential direction, for example clockwise as viewed in the upstream direction, and the claw-like curvature of the flow guide elements 21 runs in a second circumferential direction opposite the first, for example counterclockwise as viewed in the upstream direction. It should be noted that the fan wheel 4 is driven in a direction opposite to the path of the drive blades 6 (opposite to the circumferential direction) and thus air which flows through the electric motor device 1 is deflected counter to the circumferential direction. This is later with reference to Fig. 9 described again in more detail. It should be noted that the drive directions and courses mentioned above by way of example in or counterclockwise are not limited to this, but that the electric motor device 1 can also be constructed the other way round, ie the drive direction of the fan wheel 4 and the direction of the drive blades 6 and the flow guide elements 21 can also be oriented the other way round.

The assembly consisting of the electric motor 2, the fan wheel 4 and the motor housing 9 is inserted into the main body 13 of the fan housing from the upstream direction in such a way that radial outer flanks of the flow guide elements 21 on a section of the inner contour or inner surface 11 of the fan housing which is formed by the main body 13 will come to rest and that the cable duct 12, which runs through one of the flow guide elements 21, is aligned with the through opening in the main body 13 to the electronics receiving space 14. The electronics receiving space 14 can be seen in this view in that the main body 13 has a cylindrical, smooth outer surface in a corresponding area, while an outer circumference of the main body 13, apart from this area, is provided with cooling fins 22. The main body 13 will be discussed later with reference to Figures 7 and 8 described in more detail. The inlet connector 8 is plugged into / onto the main body 13 on an upstream side, there preferably by means of screws or the like. fastened and thus closes the fan housing. A transition between the main body 13 and the inlet connector 8 is located on the inner surface or inner contour of the fan housing at a level at which the flow guide elements 21 are attached, ie at the same axial position as an upstream end of the flow guide elements 21.

If necessary, the cable harness can now be shortened and connected to the electronic device (not shown), for example a circuit board. The electronics device is inserted into the electronics receptacle 14 and this is closed by the receptacle cover 15, in particular by screws or the like, with a further cable harness with one or more cables (not shown) for power supply and / or control of the electronics device in an opening provided for this purpose is guided in the receiving space cover 15.

It should be noted that an order of the assembling steps for assembling the electric motor device 1 is not limited to the above order. For example, the motor housing 9 can be individually, i. H. before the electric motor 2 and / or the fan wheel and / or the associated wiring harness are mounted, are inserted into the main body 13 of the fan housing.

Fig. 3 shows a side view of the motor housing 9, in which its teardrop-shaped outer surface or outer contour can be clearly seen. At an upstream end of the motor housing 9, in this view above, the upstream outer edge 16 can be seen, starting from which the inlet section 17 of the outer surface or outer contour arches convexly outwards, reaches or defines the maximum outer diameter, the convex curvature downstream of the maximum Outside diameter is continued by a certain distance and then merges tangentially into the outlet section 18 which extends conically in the direction downstream and which finally ends at the downstream bottom or end face of the motor housing 9. The curvature which forms the cable duct 12 protrudes downstream beyond the ground.

In Fig. 3 the motor housing 9 is arranged in such a way that one of the flow guide elements 21 is shown in a plan view of its radial outer flank, whereby its course can be clearly seen. The flow guiding elements 21 are preferably formed in one piece with the motor housing 9. Each of the flow guide elements has a narrow, upstream end formed as an inlet edge 25, which attaches to the outer surface or outer contour at an axial position close to the maximum outer diameter, in particular a certain distance upstream thereof. Starting from the inlet edge 25, the flow guide element 21 widens along its claw-like curved course or along its inlet-side end section 23 with respect to the circumferential direction of the motor housing 9 and thus forms an essentially triangular radial outer flank. At a downstream end of the inlet-side end section 23, the curved inlet-side end section 23 extends essentially tangentially in a straight line in the axial direction or in the downstream direction (ie, lying in a plane with the central axis) on the outlet-side end section 24, which runs linearly or straight up to the downstream end of the motor housing 9 and there forms an outlet end 26 which runs purely radially.

In Fig. 3 it can also be seen that of the flow guide element 21 shown in plan view of the radial outer flank, no side flanks facing in the circumferential direction can be seen in this view. This is the case because the flow guide element 21 is indeed bent at its inlet-side end section 23, but is intrinsically untwisted or untwisted and the side flanks at each location are perpendicular to a plane which corresponds to the plane of view. Or, in other words, every line on the side flanks which lies in a surface transverse to the central axis is parallel to the purely radial outlet end 26. This is in FIG Fig. 3 as well as in Fig. 6 each illustrated on one of the flow guide elements 21 by corresponding dashed lines drawn in on a visible side flank.

Fig. 4 shows a detailed view of the outlet-side end section 24 of one of the flow guide elements 21. It can be seen that this widens towards the outlet end 26 in the radial direction and forms a nose-like projection 27. This nose-like projection 27 engages in a later with reference in the assembled state Fig. 7 recess 28 described in more detail in the inner surface or inner contour of the main body 13 of the fan housing in order to fix the motor housing 9 in position therein in the circumferential direction and to facilitate a corresponding positioning during assembly.

Fig. 5 14 shows a detailed view of the inlet-side end section 23, in particular an inlet edge 25, of one of the flow guiding elements 21. A substantially triangular, hook-like projection 29 protruding in the upstream direction or towards the convex outer side or side flank of the curved inlet-side end section 23 is formed radially on the outside of the inlet edge 25 . In the assembled state, this hook-like projection 29 engages under a downstream edge of the inlet connector 8 in order to be supported thereon in the upstream direction, in particular it engages in a gap or recess between this edge and an upstream edge of the main body 13 on the inner contour or inner surface 11 of the fan housing. In this way, the motor housing 9 is fixed in position in the axial direction with respect to the fan housing in the assembled state.

Fig. 6 shows the motor housing 9 from a downstream view. It can be clearly seen that the outlet ends 26 of the flow guide elements 21 extend radially in a ray-like manner. Furthermore, as already described above, dashed lines lying in planes transverse to the central axis illustrate the course or an alignment of the side flanks of the flow guide elements 21. In particular, a first line L1 along the inlet edge 25 and a radially extending second line L2 along the outlet end 26 are one the flow guide elements 21 are shown, which are parallel to each other and to every other dashed line along the side flanks. An obtuse angle thus opens between the inlet edge 25 or the line L1 and a circumference of the outer surface of the motor housing 9 belonging to the inlet edge 25. The angle between each of the dashed lines and an associated circumference decreases steadily in the downstream direction until an almost right angle is reached at a downstream end of the claw-like curved inlet-side end section 23 (more precisely, the right angle is not at the side flank itself, but reached in the middle of the flow guide element or in the middle between the two side flanks).

Also shows Fig. 6 that the individual flow guide elements 21 do not overlap one another in the circumferential direction. They each extend in an angular range which does not exceed 360 ° divided by the number of flow guiding elements 21 or which does not exactly reach it. End point P marks a radially inner end of one of the inlet edges 25, that is to say a point of the corresponding flow guide element 21 that is at most in the circumferential direction from the corresponding outlet end 26. This end point P lies in a plane with a side flank of the adjacent flow guide element 21 facing the flow guide element 21 in question, which Level has the second line L2 drawn in this view and the central axis. In other words, in this view the end point P appears to be on the line L2. In the present embodiment, for example, ten flow guide elements 21 are provided, each having an angular range of im Take essentially 36 °. In addition, in Fig. 6 It can be seen that the flow guiding element 21 in which the cable duct 12 is formed (in this view the upward-facing flow guiding element 21) is formed somewhat wider than the other flow guiding elements 21 in order to have space for the cable duct 12.

Fig. 7 Fig. 13 is a perspective view of the main body 13 of the fan housing. The inner surface or inner contour 11 narrows conically in the downstream direction and has recesses 28 distributed in the circumferential direction in a rear, downstream region, which are used to receive the nose-like projections 27 of the flow guide elements 21. At a position which is adjacent to the electronics receiving space 14, instead of a recess 28, the through opening is provided, which connects the inner surface 11 to the electronics receiving space 14. Downstream of this through opening, an inwardly protruding shoulder is provided, which serves as a stop for the curvature having the cable duct 12 on the downstream face of the motor housing 9 and thus fixes the motor housing 9 in the mounted state with respect to the fan housing in the downstream direction.

An outer area of the fan housing has a conically tapering surface corresponding to the inner surface 11, from which the cooling ribs 22 extend outward in such a way that they define a substantially cylindrical or only slightly conically tapering basic shape of the fan housing. In a further outer area, no cooling fins are provided, but a wall of the electronics receiving space 14 is formed, which essentially follows the basic shape of the fan housing defined by the cooling fins 22.

Fig. 8 FIG. 12 shows a view of the main body 3 of the fan housing from the downstream direction, the outer areas which have the cooling fins 22 and the electronics receiving space 14 being clearly visible.

Fig. 9 FIG. 11 shows a partially longitudinal sectional view of the electric motor device 1 according to the embodiment of the invention, which is used to illustrate the by Arrows shown air flow within the fan device is used. The electric motor 2 drives the fan wheel 4, in this example in a counterclockwise direction when viewed from the upstream direction. As a result, air, for example, is sucked in through the inlet connector 8 and deflected between the rotating drive blades 6 of the fan wheel 4 in the second circumferential direction (counterclockwise) and directed into the annular gap 19 in the downstream direction. After the air emerges from the drive blades 6, it is located in an area in which the annular gap 19 is not subdivided or forms a circumferential space (between the drive blades 6 and the flow guide elements 21) and can freely circle in the second circumferential direction. This slows the flow rate of the air. The air circulating in the annular gap is then intercepted by the inlet edges 25 of the flow guide elements 21 facing the air flow and introduced between the flow guide elements along the side flanks of the flow guide elements without an abrupt diversion (that is, in a flowing transition, i.e. with little turbulence). Along the curved course of the inlet-side end sections 23 of the flow guide elements 21, the air is then deflected in the downstream direction, more precisely, in the axial direction, taking into account the tapering diameter of the annular gap 19, and there it is discharged from the outlet connection 20 of the electric motor device 1. Since the diameter of the annular gap 19 decreases in the downstream direction, a flow cross-section correspondingly decreases steadily along the motor housing 9, which suddenly widens after exiting the flow guide elements 21.

Fig. 10 Fig. 13 shows a perspective partial sectional view of an electric motor device according to a second embodiment. This corresponds in terms of its components and its basic structure to the first embodiment, which is why only differences between the same are discussed below.

According to the second embodiment, the fan housing is constructed in three parts and has the main body 13, which is provided upstream with the inlet connector 8 provided as a cover and downstream with an outlet connector 20 provided as a cover. The inlet port 8 extends further in the downstream direction than in the first embodiment. The Outlet nozzle 20 forms part of the inner contour or inner surface 11, which extends conically tapering beyond the six flow guide elements 21. A section of the fan housing provided upstream thereof is of straight cylindrical design and integrally forms the outlet-side end sections 24 of the flow guide elements 21, which are connected at their inner end by a ring which also serves as a stop for the motor housing 9 and holds a downstream part of the electric motor 2. The tapering part of the teardrop-shaped inner surface or inner contour 11 continues upstream of the straight cylindrical section. In this embodiment, one of the outlet-side end sections 24 has the cable feed-through channel 12. The motor housing 9 has only the claw-like curved, inlet-side end sections 23 of the flow guide elements 21. The outlet-side end sections 24 run (exclusively) radially and the inlet-side end sections 23 are curved at their downstream ends in such a way that they bear tangentially to the outlet-side end sections 24. The hook-shaped projections formed in the corresponding inlet edges 25 are significantly larger and accordingly more stable than in the first embodiment. In addition, the inlet edges 25 of the flow guide elements 21 start at an axial position of the motor housing 9, which is offset from the position of maximum diameter by a certain distance in the downstream direction, so that the flowing air circulates longer in the space between the fan wheel 4 and the flow guide elements 21 can.

Fig. 11 Fig. 13 shows a perspective partial sectional view of an electric motor device according to a third embodiment. This corresponds in terms of its components and its basic structure to the second embodiment, which is why only differences between the same are discussed below.

The third embodiment essentially differs from the second embodiment in that the flow guide elements 21 do not have any hook-shaped projections. Furthermore, in particular the outlet-side end sections 24 are made shorter, so that the downstream end of the electric motor 2 protrudes from the ring, and the fan housing, in particular the inlet connection 8, is shortened. The ring also has a step in the upstream direction on which the motor housing 9 is centered.

Reference symbol list

1

Electric motor device

2

Electric motor

3

Motor axis

4th

Fan wheel

5

Base body (fan wheel)

6th

Drive blades (fan wheel)

7th

Inlet opening

8th

Inlet nozzle (fan housing)

9

Motor housing

10

Engine compartment

11

Inner contour

12th

Cable entry duct

13th

Main body (blower housing)

14th

Electronics recording room

15th

Receiving space cover

16

Upstream outer edge (motor housing)

17th

Inlet section or air / gas inlet section (motor housing)

18th

Outlet section or air / gas outlet section (motor housing)

19th

Annular gap

20th

Outlet port

21

Flow control elements or air / gas control elements (motor housing)

22nd

Cooling fins

23

inlet-side end sections (flow guide element)

24

outlet end sections (flow guide element)

25th

upstream inlet edge (flow guide element)

26th

Outlet end (flow guide element)

27

Nose-like projection (flow guide element)

28

Recess (fan housing)

29

Hook-like projection (flow guide element)

Claims (10)

Electric motor device (1) with an electric motor (2) and an integral fan device, which
a fan wheel (4) which is mounted at one axial end of the electric motor (2) on its motor axis (3), and
a fan housing (8, 13) which surrounds a motor housing (9) receiving the electric motor (2) on the outside in a jacket-like manner and which between itself and the motor housing (9) forms an annular gap (19) carrying a gaseous fluid, which is formed by rib-shaped, in Circumferentially spaced apart and axially extending flow guide elements (21) is subdivided, which are each curved claw-like in the circumferential direction at their inlet-side end sections (23),
wherein the motor housing (9) has a teardrop-shaped axially extending outer contour with a radially outwardly rounded inlet section (17) which merges at its downstream end, preferably smoothly without a straight cylindrical intermediate piece, into a preferably conically tapering outlet section (18),
characterized in that the annular gap (19) is delimited radially outwards by an inner contour (11), preferably of the fan housing (8, 13), extending axially around the motor housing (9) in a teardrop shape, and
that the inner contour (11) extends conically at least up to a downstream end of the flow guide elements. Electric motor device (1) according to claim 1, characterized in that the claw-like curved, inlet-side end sections (23) have at least one third, preferably up to two thirds, of the flow guide elements (21). Electric motor device (1) according to one of the preceding claims, characterized in that a width of the annular gap (19) in the axial region of the Inlet section (17) and / or in the axial region of the outlet section (18) is essentially constant in the axial direction. Electric motor device (1) according to one of the preceding claims, characterized in that axially upstream inlet edges (25) of the flow guide elements (21) are parallel to the respective outlet ends (26), preferably outlet-side end sections (24) of the flow guide elements (21), which extend from the Claw-like curved inlet-side end sections (23) extend axially tangentially towards the outlet ends (26), and that the flow guide elements (21) are preferably untwisted or untwisted. Electric motor device (1) according to Claim 4, characterized in that the outlet ends (26) of the flow guide elements (21) protrude radially outward. Electric motor device (1) according to one of the preceding claims, characterized in that six to sixteen, preferably eight to twelve, more preferably ten flow guide elements (21) are provided. Electric motor device (1) according to one of the preceding claims, characterized in that the claw-like curved inlet-side end sections (23) of the flow guide elements (21) extend such that the flow guide elements (21) do not overlap one another in the circumferential direction. Electric motor device (1) according to one of the preceding claims, characterized in that one of the flow guide elements (21) preferably on the outlet-side end section (24) forms a radially running cable duct (12) which has a motor receiving space (10) within the motor housing (9) a through opening of the fan housing (8, 13) connects in order to provide a cable bushing for actuating the electric motor (2). Electric motor device (1) according to one of the preceding claims, characterized in that the fan housing (8, 13) forms an electronics receiving space (14) for receiving an electronic device, which is preferably accessible on a downstream end face of the fan housing (8, 13) and preferably through a receiving space cover (15) can be closed or closed. Electric motor device (1) according to one of the preceding claims, characterized in that the axially teardrop-shaped inner contour (11), in particular of the fan housing (8, 13), extends conically tapering beyond a downstream end of the motor housing (9) and in an outlet connection ( 20) ends.

Images