DE10204037B4 - Radial fan with electric motor - Google Patents

Abstract

Electric motor-driven radial fan (2), in particular for conveying a gas-air mixture for a gas boiler or a gas burner, comprising: a fan housing (4) with an impeller (6) rotating therein and with in each case one intake and outlet opening (41 and 42), an electric motor (8) arranged outside on a first end face (43) of the fan housing (4) with:
a) a rotor (81) fixedly mounted on a shaft (61) for direct drive of the impeller (6),
b) one of the fan housing (4) separate, arranged on this bearing plate (10) for receiving the stator of the electric motor (8) including the bobbin (83) and
c) at least one bearing (12, 121, 122) for the shaft (61) of the rotor (81) and
d) one in the bearing plate (10) arranged one-sided bearing (12) of the electric motor (8), wherein the bearing (12) is formed at least partially outside the rotor (81).

Description

The The invention relates to an electric motor driven radial fan, in particular to promote a gas-air mixture for a gas boiler, a gas burner or the like.

Accordingly, FIG an electric motor driven radial fan a fan housing with a rotating therein blower and in each case one intake opening and an outlet opening and an electric motor with a rotor mounted for direct drive the blower wheel on the outside arranged on a front side of the fan housing is. The radial fan furthermore has at least one bearing plate arranged on the fan housing for receiving at least one bearing for the rotor and one on the end shield fixed stator of the electric motor with a bobbin. It is also a circuit board with control electronics located thereon provided for controlling the electric motor and a cooling fan, the coaxial is arranged to the rotor axis of rotation of the electric motor.

Radial blower for the gas heating industry, those for promotion a gas-air mixture for a gas boiler, a gas burner or the like. Be used for driving an impeller typically an electric motor, which is designed as a so-called. Internal rotor can be. The one for this necessary two bearing brackets At the two rotor ends require a relatively large length of the The electric motor. In addition, you can the rotating masses in such engines only in a blower charging plane be balanced because other rotating components are not accessible. The compensation of moment unbalance is hardly possible. For high performance requirements is an extra cooling the electric motor by means of cooling wings necessary, whereby the axial length additionally is enlarged. Such radial fan have to also be checked for leaks, which so far only at the complete mounted blower possible was.

From the DE 41 41 106 C2 a blower is known in which a cover part of the housing has a peg-shaped projection which is designed to receive bearings for the electric motor. In the electric motor is an external rotor whose shaft passing through the pin is mounted twice, namely on the one hand in wesentli chen laterally outside of the center of gravity of the engine and on the other hand blower side approximately in the top plane.

These Design is particularly disadvantageous because the special Lid form leads to a costly casting. Another disadvantage is that the vibration vibrations undamped on the big one Housing cover to be transferred, which acts like a speaker or a resonator box.

From the DE 41 37 465 C2 For example, a housing with a one-sided attachment of a stator of a brushless DC motor to a housing part is known. Also in this engine is an external rotor motor, which does not have a bearing plate in the usual sense. The electric motor is inserted into the impeller, with the hub, which is seated on a housing axis, held on conically arranged spokes in front of the engine extending into the air inlet. The electric motor is arranged next to the staggered hub part. From the hub portion, star-shaped arms project conically radially outward toward the motor mount of the wheel which receives the rotor. Such a combined fan-wheel-motor arrangement is also very expensive and leads to an additional complex construction for the axle bracket.

task The invention is a radial fan of the generic type to disposal to provide, which is characterized by a low height.

These The object is achieved with the subject of independent claim 1. characteristics Advantageous developments of the invention will become apparent from the dependent Claims.

According to the invention a rigidly connected to the rotor of the electric motor shaft of the impeller a one-sided storage, which is arranged between the impeller and rotor body is.

By This one-sided storage with only one bearing plate can be a significant reduction in overall height be achieved. Instead of being stored on both sides of the stator Rotor of the electric motor is its entire storage on one side moved to the blower wheel followed. This construction makes a moment balancing of all rotating Parts especially easy.

According to a first embodiment of the invention, the one-sided storage of closely spaced rolling bearings whose outer bearing shell is in each case positively and / or non-positively fixed in the bearing plate and the inner bearing shell each positive and / or non-positively with the shaft of the impeller or with is connected to the rotor of the electric motor. As a rolling bearing can be used standard commercial parts that are available inexpensively and in good quality. Depending on the available installation space or desired Kom Compact bearings can be used for simple deep groove ball bearings, tapered roller bearings, needle roller bearings or other types of construction.

A alternative embodiment The invention provides that the one-sided storage of at least a sliding bearing, which has an axial fixation and a radial Rotation of the fan shaft or the rotor of the electric motor allows. By means of such Slide bearing or two or more such plain bearings may possibly a be made even more compact design of the storage unit.

Of the Cooling wing is preferably on a blower wheel opposite attached free end of the rotor of the electric motor. A special compact design leaves be achieved in that the cooling wing in a recess of the Printed circuit board is arranged and rotated in the plane of the circuit board. The preferably round printed circuit board has a central for this purpose Recess on. The printed circuit board is typically above the Electric motor mounted so that by the arrangement of the cooling wing in the level of the circuit board achieved a significant reduction in height becomes. By the cooling in the circuit board level cooling wings is due to improved cooling an increased Power output of the engine without additional height allows.

A Another embodiment of the invention provides that the storage the shaft and the rotor protrudes into the fan housing, wherein the impeller in a central area in the vicinity The shaft-hub connection is shaped so that its outer areas partially include storage. That way, one is special compact design of the radial fan possible, for this the space of storage partially pulled the drawn inward impeller becomes.

A preferred embodiment The invention provides that the shaft with the impeller together with the rotor and the cooling fin fine and / or torque balanced.

The Balancing levels are easily accessible in this mounting condition. This balancing on two balancing levels is possible, which In particular, also moment unbalancing can be compensated. The One balancing plane can pass through the impeller, the other through the impeller Cooling foot formed become. The storage can in this way also high standards the smoothness suffice.

Of the bobbins according to a Embodiment of the invention at least two bobbin halves, by means of the windings of the stator, by means of a plug or a screw connection positively and / or non-positively held together.

Preferably a Hall sensor is arranged next to the rotor of the electric motor, which is coupled to the on-board control electronics is and at any time an exact detection of the speed of the electric motor allows.

A preferred embodiment The invention provides that a caused by the rotating Kühlfügel diagonal airflow each flow components along the top and bottom of the circuit board and through the Electric motor has. By means of a specially shaped compact cooling wing is a comprehensive and effective cooling the high-temperature-loaded components of the radial fan possible.

at a leak test the blower can the introduced test pressure escape through the ball bearing. It can therefore without additional aids It can not be determined if the blower is leaking. According to one Another advantageous embodiment of the invention is on a to the electric motor facing top of the bearing plate a circumferential first sealing surface intended. about this first sealing surface can by means of a relatively small test bell sealed the ball bearing become. The leak test can therefore already an early Production stage are carried out at partially assembled engine, which may be expensive Repair work can be avoided.

alternative or additionally this can be done on the first end facing the electric motor of the fan housing a circumferential second sealing surface for Leak testing be provided. The leak test takes place in this case when the terminal is assembled (gas boiler, Etc.).

A another embodiment The invention provides that between end shield and fan housing a Elastomeric seal is provided, which faces the interior of the fan housing its outside seals. In this way, a gas outlet from the fan housing can be prevented become. In addition, any false air is kept away from the fan housing.

Preferably the elastomeric seal is electrically conductive, which by means of embedded electrically conductive fillers guaranteed can be. In this way, static charge can be derived from the impeller become.

A fixation of the elastomeric seal in the bearing plate by means of the closer to the impeller arranged first rolling bearing contributes to a compact Design and easy mountability of the seal. In addition, a conductive connection between the impeller and the seal is ensured in this way, which is necessary for the derivation of the electrostatic charge.

to Ensuring contact protection is the electric motor according to a further embodiment of the invention with a cap made of plastic provided, the passages for the Has cooling air flow. The cap is preferably located immediately above the cooling wing, not to the height of the radial fan unnecessary to increase.

According to one Another preferred embodiment of the invention is the end shield by means of at least three, each offset by 120 ° to each other attachment points fixed with the fan housing. On This way, the electric motor in at least three, each order Twisted 120 ° Mounting positions bolted to the fan housing become. Thus, a plug or line connection of the circuit board is through Twisting the electric motor with respect to the fan housing by 120 ° in its Location variable.

Of the End shield can be additional radial supports have, in a horizontal mounting position of the radial fan for adequate support and Centering of the electric motor care. These radial supports can For example, the shape of rubber or Have plastic buffers that are hung in the bearing plate and supported against a bridge on the fan housing.

Further Details and advantages of the invention can be taken from the following description of the figures become.

The The invention will now be described by way of embodiments with reference to FIG the enclosed figures closer explained. Show it:

1 a schematic plan view of an inventive radial fan,

2 a schematic side view of the radial fan,

3 a schematic sectional view of the radial fan along the section line AA 1 .

4a to 4e the end shield in different views or sectional views,

5a to 5d the lower bobbin half in different views or sectional views,

6a to 6c a first variant of the upper bobbin half in different views or sectional views,

7a to 7c the cooling wing in different views or sectional views,

8a to 8b a variant of the elastomeric seal in different views or sectional views.

1 shows a schematic plan view of an inventive radial fan 2 that a fan housing 4 having an impeller (not visible) rotating therein and an electric motor (not visible) driving the impeller. The fan housing has an inlet opening which is located on the rear side of the fan housing (not visible here) and forms a central part of a second end face of the flat-cylindrical fan housing. Such radial blowers are used, for example, to promote a gas-air mixture for a gas boiler or a gas burner.

On the front page 43 the electric motor is arranged, that of a cup-shaped cap 18 covered and largely enclosed. The cap 18 has a number of passages 181 on, which allow effective cooling of the electric motor and its control electronics by means of air flowing through. In the illustrated embodiment, the passage openings 181 designed as rectangular openings in a star-shaped arrangement. The cap 18 has a cup-like design (cf. 2 ), whereby they can enclose the electric motor from three sides and thus can largely shield against contact.

3 shows a schematic sectional view of the radial fan 2 along the section line AA 1 , Based on 3 become the individual components of the radial fan 2 and their interaction described. The essential items are then again using the 4 to 9 explained in more detail.

The fan housing 4 has a flat shape in the illustrated embodiment. On his first front page 43 is the electric motor 8th fixed, the shaft protrudes into the housing. The first front page 43 opposite second end face 44 is as a housing cover 9 ausgestaltet, which is placed on a circumferential edge of the cylinder jacket surface of the fan housing and screwed or pressed. This housing cover 49 thus forms the entire second end face 44 , In its center is the intake 41 , which is designed slightly funnel-shaped inwards and thus a better flow of the impeller 6 allows. The intake opening 41 is surrounded by another flange, which is provided with a series of blind holes, possibly with internal thread. By means of this further flange, a sealing mounting on a corresponding suction line or the like. Take place.

The fan wheel 6 is rotatable on a shaft 61 attached, which is integral with a rotor 81 of the electric motor 8th is trained. If therefore in the following context only from the shaft 61 or only from the rotor 81 The speech is, therefore, primarily their spatial and functional assignment to the impeller 6 or to the electric motor 8th addressed. However, it is basically meant the common component.

The wave 61 or the rotor 81 is by means of two rolling bearings 121 . 122 in a bearing plate 10 stored with the fan housing 4 connected via rubber-elastic elements. For this purpose are on the first front page 43 of the fan housing 4 three sockets 50 provided, of which in the sectional view of the 3 only one is visible in full section. The cap 18 , in the 3 is indicated with a broken line, extends beyond the cup-shaped portion of the bearing plate 10 , so overall a reliable shield for the electric motor 8th is guaranteed. The bearing plate 10 , which subsequently uses the 4 is explained in more detail, has a central tubular portion 105 for receiving the two rolling bearings 121 . 122 and a cup-shaped outer area, whose flat bottom area 106 approximately centrally perpendicular to the cylindrical outer circumferential surface of the tubular portion 105 empties. The pot-shaped outer region is pulled axially upwards at the edge and has fastening receptacles there 107 for the bobbin 83 of the electric motor 8th on. On the outer sides of the axially upwardly drawn portion of the cup-shaped outer region are outwardly facing fastening eyes 108 provided by means of which the bearing plate 10 over rubber-elastic elements on the pedestals 50 of the fan housing 4 put on and fixed there by means of threaded screws with sleeve.

The rolling bearings 121 . 122 for storage of the shaft 61 are arranged relatively close to each other and thus allow a one-sided storage of the shaft according to the invention 61 between blower wheel 6 and the actual electric motor 8th with his rotor 81 , In the illustrated embodiment, it is in the rolling bearings 121 . 122 each with commercially available deep groove ball bearings. Alternatively, roller or needle roller bearings, tapered roller bearings or other types of roller bearings can be used, which can absorb primarily radial forces. Furthermore, alternatively, plain bearings for supporting the shaft 61 be used.

With the outer bearing shell 123 the closer to the blower wheel 6 arranged first rolling bearing 121 is an elastomeric seal 20 in the bearing plate 10 clamped for a seal of the fan housing 4 provides. The elastomer seal 20 surrounds the tubular portion 105 of the end shield 10 partially and has an annular sealing edge 21 on the outside on the first front 43 of the fan housing 4 rests.

In the bearing plate 10 is the two-piece bobbin 83 used, the upper bobbin half 85 has three attachment points, which are on the mounting shots 107 of the end shield 10 put on and can be screwed with these. The lower and upper bobbin half 84 . 85 existing bobbins 83 carries a plurality of coil windings (not shown) and forms together with the rotor 81 the electric motor 8th ,

The attachment points of the upper bobbin half 85 are drawn like a column upwards and form in this way three sockets for a printed circuit board resting thereon 16 , the control electronics for controlling and speed control of the electric motor 8th wearing. The circuit board 16 is preferably disc-shaped and has a circular recess in the middle 161 on, within which is a cooling wing 14 can rotate on a free end 87 of the rotor 81 is attached. The outer dimensions of the circuit board 16 If necessary, they can be so large that the cap 18 not over the outer contours of the outer surface of the fan housing 4 protrudes. Furthermore, the printed circuit board by centering (see in FIG 7b -long pin) locked before the final screwing.

In addition to the rotor, a Hall sensor (not shown) is preferably arranged, which is connected to the control electronics of the circuit board 16 is coupled and allows a detection of the rotational speed of the electric motor.

The rotating cooling wing 14 sucks cooling ambient air from the outside through the passage openings 181 on the flat top of the cap 18 and promotes them in the direction of the electric motor 8th , Due to its special design, the cooling wing causes a diagonal air flow, the horizontal component of both on a circuit board top 164 as well as on a circuit board underside 165 along sweeps and the vertical component of the electric motor 8th flows through.

With the same screw fasteners, with which the upper bobbin half 85 on the bearing plate 10 is screwed, is the circuit board 16 as well as the attached cap 18 on the upper bobbin half 85 fixed.

The 4a to 4e show the bearing plate 10 in different views or sectional views. It shows 4a a top view on the top 101 of the end shield 10 and 4b a sectional view taken along the section line BB 4a , 4c shows a plan view of the bottom 102 of the end shield 10 , 4d shows a sectional view along the section line 4a , 4e shows a plan view of a detail of the tubular portion 105 of the end shield 10 ,

The bearing plate 10 essentially comprises the central tubular portion 105 , which has a hollow cylindrical shape and primarily the receptacles for the rolling bearings 121 . 122 for storage of the shaft 61 forms. For this purpose, the inside of the tubular portion 105 divided into three sections, each with different inner diameters. In a first camp recording 109 can the elastomer seal 20 as well as the outer bearing shell 123 of the first rolling bearing 121 and an adjusting element up to a stop of a central portion 111 be introduced with a smaller diameter almost free of play. Similarly, from the other side into a second bearing mount 110 the second rolling bearing 122 against the stop of the middle section 111 be pressed.

Approximately centered on the outer cylinder surface of the tubular portion 105 and perpendicular to this is the end shield 10 in a flat ground area 106 according to a first variant ( 4a to 4c ) at some distance from the tubular portion 105 one slightly above the top 101 raised first sealing surface 103 having. Outside of this first sealing surface 103 is the floor area 106 cupped beveled and finally opens in a raised edge 112 , the bearing shield 10 overall gives a pot-like contour.

Outside at the raised edge 112 are three equally spaced attachment eyes 108 provided with those of the end shield 10 using rubber-elastic elements and fixing screws on the pedestals 50 of the fan housing 4 can be fixed (cf. 3 ). As based on the 4a and 4c is recognizable, are a total of three attachment eyes 108 on the outer circumference of the raised edge 112 provided, each having a circular ring with a flat cross-section (see. 4b ) on which an outer segment is recessed at approximately an angle of 60 ° in order to facilitate the tying of the rubber-elastic elements. In a narrower connection area between raised edge 112 and circular ring of the fastening eye 108 is in each case a columnar fastening receptacle 107 provided by means of which the bobbin 83 , the circuit board 16 and the cap 18 with the end shield 10 can be connected.

At the outer periphery of the raised edge 112 are still three supports 104 provided, each centrally between two fastening eyes 108 are arranged. This allows the end shield 10 , the whole of the other components of the electric motor 8th and its cladding carries, in horizontal mounting position of the radial fan 2 be supported. The supports 104 For example, can be provided with rubber buffers or the like., Which are located on webs 51 of the fan housing 4 can support.

The floor area 106 of the end shield 10 is further provided with stiffening ribs, located on the top 101 respectively - starting from the tubular section 105 - extend radially outward. In the illustrated embodiment twelve equally spaced stiffening ribs are provided; the height of which is approximately equal to the height of the first sealing surface 103 equivalent.

The 5a to 5d show the lower bobbin half 84 in different views or sectional views. 5a shows a plan view from above and 5b a sectional view along the section line DD 5a , The lower bobbin half 84 includes a circular first bobbin cage 841 , at the same time the outer contour of the lower bobbin half 84 certainly. From the first bobbin cage 841 have four first winding webs 842 perpendicular to the inside, on which after assembly with the upper bobbin half (see. 6 and 7 ) the stator windings (not shown) of the electric motor 8th be wound up.

The four first winding bridges 842 are formed as wide webs with a U-shaped cross-section and are uniform on the inner circumference of the bobbin cage 841 arranged so that adjacent webs each enclose an angle of 90 °. The first winding bars 842 each have at their inner free ends a first winding stop 843 in the form of a part of the contour of the bobbin cage 841 following disc-shaped portion, the upwards of the outline of the respective winding web 842 surmounted (cf. 5a and 5b ). As based on the 5c (Top view from below) and 5d (perspective view obliquely from above) is clear, the first bobbin cage 841 four circumferential first Ste gabschnitte 844 on, respectively the courses of all inner edges of the lower bobbin half 84 follow and point vertically downwards. In cross section ( 5b ) results in a stepped contour with the outer first bobbin cage 841 and the slightly farther inside first land section 844 which has approximately the same height as the first turn stop facing in the other direction 843 each winding web 842 ,

The 6a to 6c show a first variant of the upper bobbin half 85 in different views or sectional views. 6a shows a side view, 6b a top view from above and 6c a sectional view taken along the line DD of 6b , The design of the upper bobbin half 85 Corresponds in its essential details largely the lower bobbin half 84 , wherein the upper bobbin half 85 additionally has external attachment or suspension points, with which they on the end shield 10 can be fixed or screwed.

Like the lower bobbin half 84 has the upper bobbin half 85 a circular second bobbin cage 851 on the diameter of the first bobbin cage 841 corresponds and has a similar contour. From the second bobbin cage 851 have four second winding bars 852 vertically inwards, on which after assembly with the lower bobbin half 84 (see. 5 ) the stator windings (not shown) of the electric motor 8th be wound up.

The four second winding webs 852 are formed as wide webs with a U-shaped cross-section and are uniform on the inner circumference of the bobbin cage 851 arranged so that adjacent webs each enclose an angle of 90 °. The second winding webs 852 each have at their inner free ends a second winding stop 853 in the form of a part of the contour of the bobbin cage 851 following disc-shaped portion, the upwards of the outline of the respective winding web 852 surmounted (cf. 6a and 6c ). Like the first bobbin cage 841 has the second bobbin cage 851 four circumferential second web sections 854 on, respectively the courses of all inner edges of the upper bobbin half 85 follow and point vertically downwards. In cross section ( 6c ) results in a stepped contour with the outer second bobbin cage 851 and the slightly further inboard second land section 854 ,

The attachment points 855 each consist in radially from the second bobbin cage 851 outwardly facing connectors, to each of which a columnar pipe section is attached. These pipe sections each have a parallel to the central axis of the bobbin bushing whose diameter corresponds to a guided in them fastening screw. In the illustrated embodiment, three attachment points 855 provided, which are each uniformly distributed on the circumference of the bobbin and thus each having an angular offset of 120 ° to each other. By means of the attachment points 855 is both an attachment of the bobbin 83 on the bearing plate 10 as well as a precise fixing of the circuit board 16 and the cap 18 above the electric motor 8th possible.

The lower and upper bobbin halves 84 . 85 can each be put together. Possibly. Their solid cohesion can also result alone from the wound stator windings of the electric motor.

The 7a to 7c show the cooling wing 14 in different views or sectional views. It shows 7a a schematic side view, 8b a schematic plan view and 7c a full cut of the chill 14 along the line GG the 7b , As based on the 7a can be seen, the Kühlfügel points 14 a tubular hub region 141 as well as an outer cage 142 up, over five rotor blades 143 with the hub area 141 connected is. The hub area 141 is designed as a hollow cylinder and corresponds to its inner diameter exactly the outer diameter of the rotor 81 , on its upper free end 87 he can be deferred. The rotationally fixed connection may preferably be designed as a press fit, so that the cooling vanes 14 neither from the rotor 81 slip off yet can turn relative to this. The tubular hub area 141 has a sufficient length for a tight fit on the rotor 81 on, leaving the chiller 14 can not perform wobbling at higher engine speeds.

From the upper half of the cylindrical surface of the hub area 141 The rotor blades protrude at regular angular intervals 143 outward. In the illustrated embodiment, five rotor blades 143 intended. The number of rotor blades 143 Basically depends on the required air flow at the typical speeds, which for the impeller 6 are provided, and is preferably determined by experiments. Too many or too large rotor blades 143 require an increased drive power of the electric motor 8th ; the resulting cooling performance may not be needed at all.

The outer edges of the rotor blades 143 each end in a hollow cylindrical ring land 142 , of the to the upper edge of the rotor blades 143 is closed. On the side facing away from the Moter the ring land has a circumferential groove 145 on. The groove 145 serves to accommodate balance weights 146 , The groove can, as shown in the embodiment, be equipped with means for fixing the weights, for example, a contour in their side walls. The outer diameter of the circular ring land 142 is preferably smaller by a small amount than the corresponding circular recess 161 in the middle of the circuit board 16 within which is the cooling wing 14 rotates. The optimum distance can be determined by experiments, but is limited radially by the presence of a Hall switch. Depending on the mounting position of the printed circuit board 16 relative to the cooling wing 14 can be achieved that both the PCB top 164 as well as the PCB bottom 165 be swept by cooling air. In the groove 142 Balancing weights conveniently threaded screws can be introduced to compensate for moment unbalance the rotating components.

Due to the special design of the cooling wing 14 is the promoted by this air from above through the passages 181 on top of the cap 18 and through the Ringsteg 142 sucked and then distributed in diagonal direction. In this way, flow components are distributed both in the vertical direction downwards as well as in approximately horizontal direction. As based on the 3 is recognizable, is the closed part of the ring land 142 slightly above the level of the PCB top 164 , On the other hand, the PCB bottom is 165 above the lower edges of the rotor blades 143 so that both sides of the circuit board 16 each be covered by a part of the cooling air flow. Further portions of the airflow are directed downwards in a vertical direction and thus can drive the electric motor 8th between rotor 81 and bobbin 83 strikethrough. The air can then be below the cap 18 escape.

The 8a and 8b show a variant of the elastomeric seal 20 in different views or sectional views. The elastomer seal 20 includes a pot-like clamping area 22 , with its cylindrical outer circumferential surface in the first bearing receptacle 109 for the first rolling bearing 121 (not shown) of the tubular portion 105 of the end shield 10 can be inserted. An end-side edge section 23 forms a circular ring, which is a right-angled transition to the hollow cylindrical clamping area 22 has and a rear stop when inserting the elastomeric seal 20 in the first camp admission 109 of the tubular portion 105 forms. The first rolling bearing 121 and a Anstellelement can then along the inner circumferential surface of the clamping area 22 to the first frontal edge portion 23 be inserted, whereby radially a firm clamping seat, which, however, allows axial movements of the bearing, for the bearing and the seal is formed.

The outer bearing shell 123 (not shown) of the first rolling bearing 121 becomes the outside in addition by a second frontal edge portion 24 shielded and protected, which is also a right angle to the hollow cylindrical clamping area 22 angeord neter circular ring section is. This is located at the first end-side edge portion 23 opposite end of the clamping area 22 , The outer bearing shell must be pushed when inserting this section, what this is preferably arched outwardly or otherwise pressed together.

The second front edge section 24 continues outward into an outer annulus section 25 , which thus together with the second end-side edge portion 24 forms a circular ring whose inner diameter is smaller and whose outer diameter is greater than that of the hollow cylindrical clamping area 22 , At the outer edge of the outer circular ring section 25 the elastomeric gasket buckles 20 with a narrow radius obliquely backwards and outwards, ie in the direction of the first end-side edge portion 23 , This inner shell section 26 forms there a support edge 28 with a relatively small radius and bulges again at approximately the same angle along an outer shell section 27 back, so that a total of a roof profile is formed. The lower end of the outer shell section 27 at the same time provides the circumferential sealing edge 21 in the installed state of the bearing plate with roller bearing and shaft on the first end face 43 of the fan housing 4 rests and its interior with the rotating impeller 6 to the outside and to the electric motor 8th seals off. The upper edge of the roof profile of inner and outer shell section 26 . 27 is the bearing edge 28 , which in the installed state of the elastomeric seal an annular support at the bottom 102 of the end shield 10 forms (cf. 3 ).

There are next to the variant of the elastomer seal shown 20 Other variants conceivable and covered by the invention, which have a different design. For example, it may be advantageous if the inner shell section 26 so that it runs in the relaxed state of the built-in elastomer seal 20 flush outside on the tubular section 105 of the end shield abuts, so on on the fan housing 4 attached end shield 10 the little evasive sealing edge 21 for a firm pressing of the support edge 28 on the bottom 102 of the end shield 10 and so too for a good sealing effect of the sealing edge 21 on the fan housing 4 provides.

A derivative of electrostatic charge from the electric motor 8 to the metallic fan housing 4 can be ensured by the fact that the elastomeric seal 20 is electrically conductive.

Claims (24)

Electric motor-driven radial fan ( 2 ), in particular for conveying a gas-air mixture for a gas boiler or a gas burner, comprising: a fan housing ( 4 ) with a rotating impeller ( 6 ) and each with a suction and outlet opening ( 41 and 42 ), outside on a first end face ( 43 ) of the fan housing ( 4 ) arranged electric motor ( 8th ) with: a) one firmly on a wave ( 61 ) arranged rotor ( 81 ) for direct drive of the impeller ( 6 ), b) one from the fan housing ( 4 ) separate, on this arranged bearing plate ( 10 ) for receiving the stator of the electric motor ( 8th ) including the bobbin ( 83 ) and c) at least one warehouse ( 12 . 121 . 122 ) for the wave ( 61 ) of the rotor ( 81 ) and d) one in the end plate ( 10 ) arranged one-sided storage ( 12 ) of the electric motor ( 8th ), whereby the storage ( 12 ) at least partially outside the rotor ( 81 ) is trained. Radial fan according to claim 1, characterized in that the one-sided bearing ( 12 ) of at least two closely spaced rolling bearings ( 121 . 122 ) whose outer bearing shell ( 123 ) in each case positive and / or non-positive in the bearing plate ( 10 ) is fixed and the inner bearing shell ( 124 ) in each case with positive and / or non-positive engagement with the shaft ( 61 ) of the rotor ( 81 ) of the electric motor ( 8th ) connected is. Radial fan according to claim 1, characterized in that the one-sided bearing ( 12 ) consists of at least one sliding bearing, the axial fixing and a radial rotation of the shaft ( 61 ) of the rotor ( 81 ) of the electric motor ( 8th ). Radial fan according to one of claims 1 to 3 with a cooling wing, characterized in that the cooling wing ( 14 ) on a blower wheel ( 6 ) opposite free end ( 87 ) of the rotor ( 81 ) of the electric motor ( 8th ) is attached. Radial fan according to one of the preceding claims, characterized in that the printed circuit board ( 16 ) perpendicular to the axis of rotation ( 86 ) of the rotor ( 81 ) is arranged. Radial fan according to one of the preceding claims, characterized in that the Kühlfügel ( 14 ) in a recess ( 161 ) of the printed circuit board ( 16 ) and rotated in the PCB level. Radial fan according to one of the preceding claims, characterized in that the bearing ( 12 ) the wave ( 61 ) and the rotor ( 81 ) in the fan housing ( 4 protruding, wherein the impeller ( 6 ) in a central area ( 62 ) near the shaft ( 61 ) is shaped so that its outer regions ( 63 ) warehousing ( 12 ) partially. Radial fan according to one of the preceding claims, characterized in that the shaft ( 61 ) with the impeller ( 6 ) together with the rotor ( 81 ) and the cooling wing ( 14 ) is finely and / or momentarily balanced. Radial fan according to one of the preceding claims, characterized in that the bobbin ( 83 ) at least two bobbin halves ( 84 . 85 ), which are joined together positively and / or non-positively. Radial fan according to one of the preceding claims, characterized in that a through a rotating cooling wing ( 14 ) caused diagonal air flow respectively flow components along the top and bottom ( 164 and 165 ) of the printed circuit board ( 16 ) and by the electric motor ( 8th ) having. Radial fan according to one of the preceding claims, characterized in that on one to the electric motor ( 8th ) facing top ( 101 ) of the end shield ( 10 ) a circumferential first sealing surface ( 103 ) is provided for a leak test. Radial fan according to one of the preceding claims, characterized in that on the to the electric motor ( 8th ) pointing first end face ( 43 ) of the fan housing ( 4 ) a circumferential second sealing surface ( 45 ) is provided for leak testing. Radial fan according to one of the preceding claims, characterized in that between bearing plate ( 10 ) and fan housing ( 4 ) an elastomeric seal ( 20 ) is provided, which is the interior of the fan housing ( 4 ) seals against its outside. Radial fan according to one of the preceding claims, characterized in that the elastomeric seal ( 20 ) has a low electrical resistance by means of embedded electrically conductive fillers. Radial fan according to one of the preceding claims, characterized in that the elastomeric seal ( 20 ) by means of closer to the impeller ( 6 ) arranged first rolling bearing ( 121 ) in the end shield ( 10 ) is fixed. Radial fan according to one of claims 1 to 14, characterized in that the elastomeric seal ( 20 ) by means of the closer to the impeller ( 6 ) arranged first rolling bearing ( 121 ) together with a positioning element in the end shield ( 10 ) is fixed. Radial fan according to one of the preceding claims, characterized in that the electric motor ( 8th ) a cap ( 18 ) made of plastic, with passage openings ( 181 ) is provided for the cooling air flow. Radial fan according to one of the preceding claims, characterized in that the bearing plate ( 10 ) by means of at least three mutually offset by 120 ° attachment points ( 46 ) with the fan housing ( 4 ) is held. Radial fan according to one of the preceding claims, characterized in that the electric motor ( 8th ) in at least three each 120 ° rotated mounting positions with the fan housing ( 4 ) is screwed. Radial fan according to one of the preceding claims, characterized in that the bearing plate ( 10 ) of the electric motor ( 8th ) at least one additional radial support ( 104 ) on the fan housing ( 4 ) having. Radial fan according to one of the preceding claims, characterized in that a line connection ( 163 ) of the printed circuit board ( 16 ) by rotating the electric motor ( 8th ) with respect to the fan housing ( 4 ) is variable by 120 ° in its position. Radial fan according to one of the preceding claims, characterized in that the cooling fan ( 14 ) a circumferentially continuous ( 142 ), which serves to receive balancing weights. Radial fan according to the preceding claim, characterized in that the circulating means ( 142 ) is a ring land. Radial fan according to one of the two preceding claims, characterized in that the annular web ( 142 ) a circumferential groove ( 145 ) into the balancing weights ( 146 ) can be used.