EP1528260A1 - Radial fan - Google Patents

Abstract

The radial fan for a gas burner has an impeller with side walls (11,12) covering its axial ends, with one (12) of the side walls having a lead-through for the impeller's drive shaft (30). A first section (44) of the casing of the impeller drive motor (45) is formed in one piece on the side wall provided with the shaft lead-through. The latter side wall forms one of the two bearing points of the impeller drive motor's rotor and has a corresponding rotor bearing arrangement.

Description

The invention relates to a radial fan according to the preamble of claim 1.

Such radial blowers are generally for example from the EP 1002957 A1, EP 1002958 A2, EP 1022469 A1 or the EP 1022470 A1 and have excellent properties in terms of the achieved working pressure, the efficiency and the blower power on.

The drive shaft for the impeller must be equipped with a drive motor connected, in turn, with the housing of the radial fan must be connected directly or indirectly. This On the one hand there is a large-scale arrangement, and it is to other two housing required, namely the fan housing and the motor housing.

An object of the present invention is therefore to to create a more compact motor-fan assembly, the can be mounted quickly and easily.

This object is achieved in that a first housing part of the motor housing of the impeller driving Drive motor in one piece with the shaft bushing provided side wall is formed, wherein this side wall one of the two bearing sides of the rotor the drive motor forms and a corresponding rotor bearing assembly having.

As a result, not only a small-volume compact overall arrangement achieved by engine and blower, which is quick and easy can be mounted, but it also eliminates otherwise required coupling and connecting links between Engine and blower. In addition to the blower housing with the one piece molded housing part of the motor housing must this then only after the insertion of rotor and windings be completed. This is only a very small Part housing needed.

By the measures listed in the dependent claims are advantageous developments and improvements of the Anspruch.l specified radial fan possible.

Preferably, a lid or cup-like second housing part the motor housing can be connected to the first housing part, in particular screwed, and forms the other bearing side of the rotor, including a corresponding rotor bearing assembly is included.

In a further advantageous structural embodiment is at the provided with the first housing part of the motor housing Sidewall next to the motor housing a housing or a cup-like housing element for an electronic control device arranged the drive motor. This is by it Protected in a compact way next to the motor housing arranged. In this case, the electronic control device suitably attached to this side wall, wherein preferably on the side wall and at least one cooling element molded for the electronic control device can be. The side wall serves in addition to Cooling of the electronic control device.

Advantageously, the blower is a so-called HG blower formed, in which one on one of the side walls arranged partition wall engages in the cup-shaped impeller and its interior into a first and a second suction chamber divided. The first suction chamber is a suction port assigned to outside air, and the second suction chamber is the direct along the blade ring extending peripheral wall area facing. The on one of the side walls, in particular on the side wall provided with the suction opening, arranged partition is preferred with this side wall latched, which also for quick and easy installation contributes to the overall arrangement.

The first suction chamber has in such a configuration as HG blower a vacuum area, in a training As a gas burner can be used to advantage that in addition to the suction opening in the negative pressure region of the first suction chamber arranged a feed opening for direct fuel gas supply is.

For radial blowers used for gas burners it is still required that the fuel gas is not in unwanted Way at unintended locations from the blower housing can escape. A critical point is the shaft feedthrough for the drive shaft of the impeller. To enter here Escape of fuel gas, even in small quantities, to prevent is advantageously a sealing device provided at the shaft bushing, being used for suction from passing through the sealing device residual gas a suction line into the vacuum area of the first suction chamber extends. Their mouth is preferably arranged next to the suction opening of the first suction chamber, where there is an automatic negative pressure. This vacuum area ensures the suction possibly through the Sealing device of reaching residual gas with the help the suction line.

The suction is expediently at least partially integrated in or on the housing wall to separate cables to avoid, which would not only visually disturbing, but are also often cause of disturbances. This suction line is preferably connected to a pressure measuring line, to check the vacuum and thus the safe function to be able to.

The sealing device is preferred as at least one stage Labyrinth seal formed. In a special favorable structural design is a labyrinth seal body in the area of the shaft feedthrough fixed to the drive shaft and between two fixed housings counterparts along a labyrinth gap arrangement arranged on its outer surface. At the inside of the case remote end portion of the labyrinth gap assembly is a arranged with the suction suction chamber, from which eventually passes through the labyrinth seal Fuel gas sucked off and returned to the first suction chamber can be. At least one of the housing-fixed counterparts is expediently in a corresponding housing recess fixed, in particular locked. This allows one fast and easy installation.

The shaft passage on the one hand and the mouth of the suction line are preferably on different sides of the Walls arranged, with the suction then over the peripheral wall extends in or on this. When assembling then automatically the necessary line connections produced.

In a preferred structural embodiment form the Peripheral wall and one of the side walls a one-piece Housing main part, with the lid-like other Side wall connectable, in particular screwed. The shaft bushing for the drive shaft is preferred arranged on the housing main part, so that even during assembly the impeller is mounted in the housing main body and this then only closed by the lid-like side wall must become.

For optimal fan characteristics, it is necessary that the radial gap between the impeller and the directly along this impeller extending peripheral wall portion of the blower housing as small as possible. To achieve this, owns this peripheral wall area preferably inside a receptacle for a plastic wall part that has the smallest possible radial gap guaranteed and preferably made of an antistatic Plastic consists of a risk of sparking in this area between the impeller and the metallic fan housing to prevent.

Fig. 1

eine perspektivische Ansicht des Gehäusehauptteils eines Radialgebläses bei abgenommener Seitenwandung,

Fig. 2

die Innenseite der abgenommenen Seitenwandung, die zusammen mit dem Gehäusehauptteil gemäß Fig. 1 das Gebläsegehäuse bildet,

Fig. 3

ein an die Seitenwandung gemäß Fig. 2 außen angeformtes Unterdruck-Leitungselement,

Fig. 4

das in Fig. 1 dargestellte Gehäusehauptteil in einer perspektivischen Ansicht der Antriebsseite,

Fig. 5

eine Schnittdarstellung des Seitenwandbereichs des Gehäusehauptteils mit anmontiertem Antriebsmotor und Elektronikgehäuse und

Fig. 6

eine perspektivische Gesamtansicht des Radialgebläses.

An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description. Show it:

Fig. 1

a perspective view of the housing main part of a radial fan with removed side wall,

Fig. 2

the inside of the removed side wall, which forms the fan housing together with the housing main part according to FIG. 1,

Fig. 3

a to the side wall of FIG. 2 externally molded vacuum line element,

Fig. 4

the housing main body shown in Fig. 1 in a perspective view of the drive side,

Fig. 5

a sectional view of the side wall portion of the housing main body with anmontiertem drive motor and electronics housing and

Fig. 6

an overall perspective view of the radial fan.

The illustrated in the figures as an embodiment radial fan has a snail-like housing, in particular according to FIGS. 1, 2 and 4 of a housing main part 10 and a lid-like, the housing main body 10 final Sidewall 11 is. The housing main body 10 itself also consists of a side wall 12 and a integrally formed thereon peripheral wall 13. One with a Blade ring 14 provided impeller 15 is rotatable in the housing main body 10 stored, as described in more detail becomes.

The impeller 15 is arranged in the housing main part 10 that his blade ring 14 is in rotation along a partially circular curved peripheral wall portion 16 in very small distance of less than 1 mm moves. From that respect the direction of rotation A of the impeller 15 rear end of the peripheral wall portion 16, the peripheral wall 13 expands below Magnification of the radial distance to the axis of rotation of the impeller 15 to a fan outlet 17 out. A contrary to the direction of curvature the peripheral wall portion 16 curved end portion the peripheral wall 13 connects the peripheral wall portion 16 with the blower outlet 17.

The one end cover for the housing main part 10 forming Side wall 11 has the outer contour of the side wall 12 of the housing main body 10, wherein the two side walls 11, 12 in the assembled state parallel and through the Width of the peripheral wall 13 arranged away from each other are. The free edge region of the peripheral wall 13 has a Groove 19 for inserting a seal and on the outside integrally molded fasteners 20 for screwing with corresponding fasteners 21 of Side wall 11 thereby serve to close the housing.

The inside of the side wall 11 has an annular Recess 22, in the assembled state, the impeller 15 engages. This is for example in the aforementioned EP 1002958 A2 described in more detail. This also applies to the corresponding sealing of the impeller 15 at the opposite Front side, where also such labyrinthine seals are provided, which can not be seen in the drawing are.

On the inside of the side wall 11 within the recess 22, a partition wall 23 is fixed, for example by Screws or locking elements 24, which in the assembly in the Engage side wall 11. In the assembled state extends this partition 23 into the interior of the cup-shaped impeller 15 and divides its interior into a first suction chamber V1 and a second suction chamber V2. To clarify this is Partition wall 23 shown in Fig. 1 in the interior of the impeller 15, although it is actually fixed to the side wall 11 is. The suction chamber V2 is the one small gap distance facing the impeller 15 peripheral wall portion 16 faces. In Fig. 2, the frontal, on the side wall 11 ending boundary surfaces of the two suction chambers V1 and V2 also designated V1 and V2.

When rotating impeller 15 in the direction of rotation A acts that Impeller 15 in the region of the first suction chamber V1 as a radial fan. Outside air is through an air intake 25 at the Side wall 11 is sucked into the first suction chamber V1 and over the peripheral region of the first suction chamber V1 through the blade ring 14 accelerated radially outward. This accelerated Air flow is divided outside into a first working flow and a second working current. The first working current arrives back to the first suction chamber V1 and gets through the radial fan action accelerates outwards again, with an essential part of this working flow on the opposite side End of the first suction chamber V1 in the spiral extension area arrives. In the region of the second suction chamber V2 the impeller at its two axial ends by the Side wall 11, 12 sealed. Towards the interior forms the partition 23 a tight seal, and on the the partition wall 23 opposite peripheral wall portion 16 takes place by the small gap distance also a seal. The impeller therefore operates in the region of the second suction chamber V2 exclusively as a cross-flow fan, which controls the working current sucked in the area of the blower outlet 17, compressed and in the spiral extension area or diffuser blows out again. The radial fan thus works in part as a two-stage blower with a through the first suction chamber V1 formed, working as a radial fan stage and a formed by the second suction chamber V2, as a cross-flow fan working stage. This mode of action is mentioned in the beginning State of the art described in more detail.

A teilring- or scoop-like Injektorwandung 26 surrounds the rear seen in the flow direction Area of the air intake opening 25 and extends obliquely directed towards the first working flow into the interior of the suction chamber V1. In the described arrangement forms next the air intake opening 25 due to the described flow conditions a negative pressure region, at which a feed opening 27 is arranged for direct fuel gas supply, that is, a supply line for fuel gas opens at this Feed opening 27, wherein due to the prevailing there No further measures for the supply of the negative pressure Fuel gas is required.

As can be seen from Fig. 1, the small gap distance in Area of the peripheral wall 13 to the impeller 15 by a plastic insert part 28 formed at this point in one corresponding recess of the peripheral wall 13 is inserted is. This plastic insert 28 is made of antistatic Plastic and can be produced as a precise molding become. In contrast, the housing is made of metal, for example, made of aluminum. In the event that a possible Strip the impeller on this plastic insert 28th should not be a problem or effectively prevented can, instead of the plastic insert 28 also a Metal insert, for example an aluminum insert, to step.

In Fig. 5 of the housing main body 10, only the side wall 12, while the peripheral wall 13 is cut off is. On this side wall is a shaft passage 29 arranged for the drive shaft 30 of the impeller 15. In a corresponding recess of this side wall 12, a labyrinth seal 31 is provided for this purpose. she consists essentially a labyrinth seal body 32, which is rotatably connected to the drive shaft 30. This Labyrinth seal body 32 is fixed between two housings Counterparts 33, 34 are arranged, of which at least the Impeller 15 facing counterpart 33 on the side wall 12th is fixed, for example by latching elements, such as locking bolts, or by screws. The inside of the blower housing Gas located only over the very small gap 35 between the rotating labyrinth seal body 32 and the two counterparts 33, 34 exit and get into this Trap in a arranged at the end of the gap 35 suction 36. By suitable design of the labyrinth seal body 32 and the counterparts 33, 34 can so a single or multi-stage labyrinth seal 31 are formed, which, as such, virtually prevents the escape of gas. In addition, however, this suction chamber 36 with the Low pressure range of the first suction chamber V1 connected, so but passing through the gap 35 in the suction chamber 36 Gas again sucked back into the housing via this suction line 37 and again a combustion process after mixing is supplied with sucked air.

This suction line 37 is only partially removed from the figures. It initially extends from the suction chamber 36 through the wall of the side wall 12 to an outside this side wall 12 and integrally formed on the peripheral wall 13 Conduit 38 inside. From this conduit element 38 from the suction line 37 extends into the wall of the lid-like side wall 11 into it, at the likewise a corresponding line element 39 is formed. At this Side wall 11 is externally formed a connecting element 40, as shown in Fig. 3 and from that in Fig. 2 still a measuring mouth 41 can be seen. The suction line 37 runs within this connecting element 40 and connects the inlet to the conduit member 39 with an orifice 42 in the first suction chamber V1, where in the suction chamber 36 eventually Gas can be sucked back.

As already mentioned, the connecting element 40 has a Measuring orifice 41, which via a line piece 43 with the suction line 37 and thus with the negative pressure range of the first Saugraums V1 is connected. At this measuring mouth 41 can Measuring means are connected to the negative pressure, the measured negative pressure as a reference variable for a not shown Can provide gas pressure control valve.

Instead of a one-piece molding, the connecting element 40 screwed in principle or in other ways be attached to the side wall 11.

Referring to FIGS. 4 to 6 is on the side wall 12 of the housing main part 10 on the outside thereof, a first housing part 44th a motor housing for an electric drive motor 45 integrally formed. This housing part consists of four a peripheral circle of the side wall 12 upstanding Wall parts. In the center are the shaft passage 29 and the drive shaft 30, wherein a bearing holder or 46 for a first rotor bearing 47 in one piece on the Side wall 12 is formed. This integrally molded first housing part 44 forms together with a lid or cup-shaped second housing part 48, the motor housing for the Drive motor 45. According to FIG. 6, the two housing parts 44, 48 screwed together by means of retaining screws 49 and serve for receiving the winding 50 and the rotor 51 of the drive motor. This rotor 51 has a rotor shaft, the is formed by the drive shaft 30. The rotor or drive shaft 30 is once in the first rotor bearing 47 and on the other stored in a second rotor bearing 52, which in the lid-like second housing part 48 arranged in a bearing holder 53 is. The drive motor 45 can thus by plugging and connecting the described parts to the first housing body 10 are formed, wherein the housing main part 10th a bearing and a housing for the drive motor forms.

In addition to the drive motor 45 or the one piece to the side wall 12 integrally formed housing part 44 is a cooling arrangement 54 for electronic components integral to the side wall 12 molded. At this point, as shown in FIG. 5 is a circuit board assembly 55 fastened, screwed in the exemplary embodiment, an electronic control device or a Part of such forms for the electric drive motor 45. To hold the printed circuit board assembly 55 are retaining bumps 56 integrally formed on the side wall 12, the screw for fastening serve the circuit board assembly 55.

A hood-like housing 57 is on the side wall 12th screwed and takes on the PCB assembly 55.

In deviation of the illustrated embodiment could also the side wall 12 with the molded housing part 44th for the drive motor 45 as a cover lid-like side wall be formed while the side wall 11 according to Fig. 2 together with the peripheral wall 13, the housing main body 10 forms. Also, both side walls 11, 12 may cover-like formed and on the peripheral wall 13th attached, for example, be screwed.

Claims (15)

Radial fan with a cup-shaped impeller (15) provided at its periphery with a blade ring (14), with a housing (10) receiving the impeller (15), which extends from a partially circular curved, directly along the blade ring (14) extending peripheral wall portion (16) of the peripheral wall (13) helically widened in the direction of rotation (A) of the impeller (15) radially to an outlet (17) and two the axial end faces of the impeller (15) covering the side walls (11, 12), wherein a the side walls (12) has a shaft passage (29) for the drive shaft (30) of the impeller (15), characterized in that a first housing part (44) of the motor housing of the impeller (15) driving drive motor (45) integrally with the the side wall (12) is formed integrally with said shaft passage (29), said side wall (12) forming one of the two bearing sides of the rotor (51) of the drive motor (45) and a corresponding rotor Bearing arrangement (46, 47). Radial fan according to claim 1, characterized in that a cover-like or pot-like second housing part (48) with the first housing part (44) is connectable, in particular screwed, said second housing part forms the other bearing side of the rotor (51) and a corresponding rotor bearing assembly ( 52, 53). Radial fan according to claim 1 or 2, characterized in that the rotor shaft of the rotor (51) is simultaneously the drive shaft (30). Radial fan according to one of the preceding claims, characterized in that on the side wall (12) provided with the first housing part (44) of the motor housing, a housing (57) or a pot-like housing element for an electronic control device (55) of the drive motor (45 ) is arranged. Radial fan according to claim 4, characterized in that the electronic control device (55) attached to this side wall (12) is fixed, wherein at this preferably at least one cooling element (54) for the electronic control device (55) is integrally formed. Radial fan according to one of the preceding claims, characterized in that a partition wall (23) arranged on one of the side walls (11) engages in the cup-shaped impeller (15) and subdivides its interior into a first (V1) and a second suction chamber (V2), and that an intake opening (25) for outside air is associated with the first suction space (V1) and the second suction space (V2) faces the peripheral wall area (16) extending directly along the blade ring (14), the partition wall (23) preferably having this side wall (11) can be locked. Radial fan according to claim 6, characterized in that in a training as a gas burner in addition to the suction port (25) in the negative pressure region of the first suction chamber (V1) a feed opening (27) is arranged for direct fuel gas supply. Radial fan according to claim 6 or 7, characterized in that in a design as a gas burner, a sealing device (31) for the drive shaft (30) on the shaft passage (29) is provided, and that for the extraction of gas passing through the sealing device (31) -Restmengen a suction line (37) extends into the negative pressure region of the first suction chamber (V1), the mouth of which is preferably arranged adjacent to the suction port (25). Radial fan according to claim 8, characterized in that the suction line (37) at least partially integrated in or on the housing wall and preferably with a pressure measuring line (43) is connected. Radial fan according to claim 8 or 9, characterized in that the sealing device (31) is designed as at least one-stage labyrinth seal Radial fan according to claim 10, characterized in that a labyrinth sealing body (32) in the region of the shaft passage (29) on the drive shaft (30) is fixed and between two housing-fixed counterparts (33, 34) to form a labyrinth-gap arrangement (35). is arranged along its outer surface, and in that on the end remote from the housing interior of the labyrinth gap assembly (35) with the suction line (37) connected to the suction chamber (36) is arranged. Radial fan according to claim 11, characterized in that at least one of the housing-fixed counterparts (33, 34) is fixed in a corresponding housing recess, in particular latched. Radial fan according to one of claims 8 to 12, characterized in that the shaft passage (29) and the mouth (42) of the suction line (37) on different side walls (11, 12) are arranged, and that the suction line (37) via the Circumferential wall (13) extends in or on this. Radial fan according to one of the preceding claims, characterized in that the peripheral wall (13) and one of the side walls (12) form an integral housing main part (10) which can be connected, in particular screwed, to the other side wall (11) in the manner of a cover, wherein the shaft passage (29) for the drive shaft (30) is preferably arranged on the housing main part (10). Radial fan according to one of the preceding claims, characterized in that along the blade ring (14) extending peripheral wall portion (16) internally has a receptacle for a smallest possible radial gap to the impeller (15) towards ensuring plastic wall part (28).

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