EP1519048A2 - Side channel compressor - Google Patents

Abstract

A side channel compressor has at least one annular, two-shell impeller housing (1), which encloses a rotatably mounted therein impeller (3) and is provided with an air intake and a Luftauslassstutzen (6,7). The impeller housing consists of two identically designed housing shells (2) which are clamped together with flat surfaces at a perpendicular to the axis of rotation of the impeller extending separating surface contiguous in the axial direction with each other. In the areas of the flat surfaces, a ring running round around (28) is arranged, through which the two housing shells (2) are centered against each other.

Description

The invention relates to a side channel compressor with an annular bivalve impeller housing having an in rotatably mounted impeller surrounds him and with a Air intake and an air outlet is provided.

A typical example of such side channel blowers is described in DE 2 223 762 A1. In this side channel compressor If the impeller housing consists of two housing shells, which are formed differently and by which an integrally formed bearing mount for the Impeller rolling bearings and a likewise molded Flange for flanging the electric motor driving the impeller wearing. The other housing shell is as a lid formed, which arranged distributed by means of edges Screw bolt with the housing shell supporting the impeller is screwed. Both housing shells are in the area of their outer edge each provided with a plane surface, in the assembled state, the flat surfaces in one perpendicular to the axis of rotation of the impeller extending Separating surface lie together. The function-related required centering of the lid to the impeller Overlying housing shell is done by a precisely fitting Turn in the lid and in this housing shell. Of the Air intake and the air outlet are at the Impeller mounted housing shell formed.

The production of two different housing shells, one of which with its bearing for the impeller the actual housing forms, while the other as a lid is formed, is expensive. In addition, the seal the two housing shells against each other in the areas the interface critical, inter alia, because of production on the Einpassbund an annular gap is present.

The object of the invention is therefore a side channel blower to create, by a cheaper Impeller housing with improved sealing properties distinguished.

To solve this problem, the inventive Side channel compressor, the features of claim 1 on.

The impeller housing of the new side channel compressor consists of two identically designed housing shells, each one at its outer edge one in the radial direction continuous plane surface carries. The housing shells are with their plane surfaces in a right angle to the Rotary axis of the impeller extending separating surface to each other lying clamped together in the axial direction. in the Areas of the plane surfaces is a ring running around arranged, through which the two housing shells against each other are centered.

Thus, the advantage of eliminating the usual double-sided recess in housing and cover half shell achieved, so that each half shell called "housing" and "Lid" is usable. Since the production-related annular gap eliminates the Einpassbund, can be a better seal reach the half shells against each other. Is to it is expedient that the ring is designed as a sealing ring, by the one existing in the area of the separating surfaces Gap is sealed. The seal thus obtained is in usually sufficient, but may be necessary in the Area of the two flat surfaces in addition to the ring another sealant for gap sealing between the two Planar be provided.

The ring is usually made of metal, in particular Steel, but it can also be made of a dimensionally stable plastic be prepared. He has an advantage in essence rectangular or square cross-sectional shape on. If the ring is designed as a sealing ring, he can have a dimensionally stable ring core, the one out a sealing material, for example. Polytetrafluoräthylen existing Wearing sealing layer.

In an expedient embodiment, the ring is on arranged radially outer edge of the two planar surfaces, however It is also possible in principle, the ring on the radially inner Provide edge of the two plane surfaces. These can be the both housing shells in the areas of their plane surface respectively have an open-edged annular groove, wherein the two annular grooves the interconnected housing shells to a complement in the circumferential direction extending channel in the the ring is arranged. This is a simple way positive, precise centering of the two housing shells guaranteed against each other. It should be noted, however, that basically the ring is not in a channel of the type mentioned must be arranged. They are also embodiments conceivable in which the ring under radial Bias on a cylindrical peripheral surface of the housing shells is placed, wherein the ring at the radially outer or radially inner edge of the planar surfaces may be arranged can.

Each of the housing shells is with a suction and a Outlet formed. In the assembled state are the unused each neck through a Closure means, for example, a lid closed.

The versatile use of housing shells can be increased by the fact that the housing shells on wear outside their mating surfaces on which the double-shell impeller housing of several compressor stages are accurately clamped axially with each other. To this Way it is possible to build multi-stage side channel blowers, the louder half shells included. The neighboring ones Impeller housing of the compressor stages are against each other centered, with only a housing shell a Includes bearing for a shaft carrying the wheels. The on the other identically designed housing shells existing Stock records remain empty.

In each housing shell, one on the opposite each other lying shell sides opening passageway be formed so that the through channels next to each other lying housing shells to a total Complete continuous axial channel. Through this axial channel can be in two- or multi-stage execution one Return of compressed air through the entire housing enable. The necessary deflection of the air takes place by associated deflection, for example. In the form of patch or inserted deflectors. The axial channel can also serve for the passage of a cooling medium.

Further embodiments of the side channel compressor according to the invention are the subject of dependent claims.

Fig. 1

einen Seitenkanalverdichter, gemäß der Erfindung, in perspektivischer Darstellung,

Fig. 2

den Seitenkanalverdichter nach Fig. 1 in einer Seitenansicht,

Fig. 3

den Seitenkanalverdichter nach Fig. 1 in einer Seitenansicht auf die Motorseite und

Fig. 4

den Seitenkanalverdichter nach Fig. 1 in zweistufiger Ausführung, in einer Schnittdarstellung entsprechend der Linie IV-IV der Fig. 3 und

Fig. 5

den Seitenkanalverdichter nach Fig. 4 in einer perspektivischen Explosionsdarstellung.

In the drawing, an embodiment of the object of the invention is shown. Show it:

Fig. 1

a side channel compressor, according to the invention, in perspective view,

Fig. 2

the side channel compressor of FIG. 1 in a side view,

Fig. 3

the side channel compressor of FIG. 1 in a side view of the engine side and

Fig. 4

1 in two-stage design, in a sectional view corresponding to the line IV-IV of Fig. 3 and the side channel compressor of FIG

Fig. 5

the side channel compressor of Fig. 4 in a perspective exploded view.

The side channel compressor shown in Figs. 1 and 2 has a substantially annular impeller housing 1, which consists of two identical housing shells 2 and encloses a shown in Fig. 4 at 3 impeller. The impeller 3 is driven by an electric motor 4, the side and coaxial with the impeller housing. 1 is flanged. The two impeller housing 1 forming Housing shells 2 are identical. Each of the housing shells 2 has a side channel receiving the impeller 3 5 on, covering most of the circumference extends and a molded air inlet 6 with a molded air outlet 7 connects. Between the air inlet nozzle 6 and the air outlet 7 is a locking piece 8 is arranged, as in side channel compressors known per se. The air intake 6 and the air outlet 7 are in a common housing part 9 formed integrally on the housing shell. 2 is formed on both sides and a flat, perpendicular to the impeller axis 10 extending fitting surface 11, and 11a wearing. In the housing part 9 is between the air intake 6 and the air outlet 7 a through-channel 12 formed over the entire axial length of the Housing shell 2 extends and in the two opposite and mutually parallel mating surfaces 11, 11a empties. The passageway 12 is in the region of the locking piece 8 arranged and is not with the side channel 5 in Connection.

The part-annular side channel 5 extends around a disc-shaped hub part 13 of the housing shell 2, on which a centric bearing housing 14 is formed, the for receiving a rolling bearing 16 for the impeller 3 bearing Shaft 10 is determined (see Fig. 4). The rolling bearing 16 is by a screwed bearing cap 17 to the outside too closed. At a radial distance is the bearing housing 14 of a tubular, substantially cylindrical Ring flange 19 surrounded, on its outer end face a flat mating surface 20 carries, parallel to the Matching surface 11 is aligned with the housing part 9 and with this lies in a common plane. At that to the Impeller shaft 100 coaxial annular flange 19 a housing shell 2 of the impeller housing 1, as can be seen from Fig. 4, the electric motor 4 flanged while on the Electric motor 4 opposite impeller housing outside on the annular flange 19 of the corresponding housing shell. 2 a lid 21, screwed sealed against the mating surface 20 is.

On the housing part 9 diametrically opposite Side is formed on the housing shell 2 a support block 22, which is located between two cooling fins 23, the the Side channel 5 containing housing shell part outside in the For example, from Fig. 1, 4 apparent manner surrounded. The support block 22 protrudes slightly axially beyond the cooling fins 23 and carries on its outside a flat mating surface 24, with the mating surface 11 of the housing part 9 and the mating surface 20 of the annular flange 19 in a common plane lies.

A arranged on the outer edge of the housing shell 2 Flange 18 carries on its side facing away from the annular flange 19 Side a flat plane 25, which is perpendicular to the Impeller axis 100 runs and in a plane with the associated Mating surface 11 of the housing part 9 is located. In the areas the mating surface 25 is in the flange 18 an open-edge Ring groove 26 is formed, which has an L-shaped cross section and is bounded by two surfaces, from one at right angles and the other parallel to the Impeller axis 100 runs. In the assembled state lie the two housing shells 2 of an impeller housing 1 with their mating surfaces 25 to each other, so that the two Ring grooves 26 extending to a circumferentially Add channel 27, which has a rectangular cross-sectional shape having. In the channel 27 is a closed dimensionally stable Ring 28 fitted tight tolerances, the two housing shells 2 centered against each other.

The ring 28 is made of aluminum or, for example, from Steel, brass or even plastic and is with a Sealing material, in particular of polytetrafluoroethylene coated, so that it acts as a sealing ring. In the area of Air intake 6 and the air outlet 7 is the Ring 28, as at 29 in Fig. 5 for the air intake 6th represented, with a respective nozzle bore enclosing formed eye-like part.

The two housing shells 2 are by rings around the Perimeter evenly distributed bolts axially braced together, not shown in detail are and pass through associated axial bores 30, which penetrate the flange 18 and the housing part 9. In the illustrated embodiment, the Arrangement made such that the ring 28 with holes 30 is provided. For axially clamped housing shells 2 of the impeller shell 1 are, as already mentioned, the housing shells with their mating surfaces 25 against each other pressed and radially centered over the ring 28, wherein the ring 28 at the same time sealing the Impeller housing 1 in the areas perpendicular to the wheel axis 10 extending separating surface between the causes two housing shells. This seal is very effective because of the axially inserted into the holes 30 Screw bolt generated contact force immediately is transmitted to the ring 28.

While in Figures 1 and 2, a single-stage side channel compressor is shown, the only one of two identical housing shells 2 composite impeller housing 1, Figures 4, 5 show a two-stage Embodiment in which two identical impeller housings 1, 1a, each of which encloses its own impeller 3, axially connected to each other. As in particular from Fig. 4 to refer, the adjacent housing shells are the second the impeller housing 1, 1a with their in a common Level lying mating surfaces 11, 20 and 24 to each other adjacent tensioned by tie rods 31 axially against each other. In addition, these two housing shells 2 by one to the impeller axis 10 coaxial inner steel existing centering ring 32 radially centered. The centering ring 32 engages positively in cross-section L-shaped, open-edged turns on the inside of the ring flange 19 one. It is inserted under preload clearance and, together with the mating surfaces 11, 20, 24 a exactly centered and with respect to the impeller shaft 10 exactly oriented at right angles to the two impeller housings 1, 1a. The impeller shaft 10 is through the two adjacent impeller housing 1, 1a continuously formed and carries both wheels 3, while the electric motor 4 to the outer housing shell 2 of the impeller housing 1a is flanged and the outer ring flange 19 of the other drive housing 1 through the lid 21 is closed.

Fig. 4 also shows that the impeller shaft 10 on the impeller side only in a single roller bearing 16th is mounted, which on the electric motor 4 facing Side in the corresponding housing shell 2 of the impeller housing 1 is arranged. A second depository of the Impeller shaft 10 is in the bearing plate 34 of the electric motor 4 present and formed by a rolling bearing 35.

Similar to the described with reference to FIGS. 4, 5 two-stage Training the side channel blower are also Embodiments possible in which, in a corresponding manner a plurality of impeller housing 1, 1 a axially flanged together are to side channel blower with more than two To create compressor stages. For all these multi-level Side channel compressors are the through channels 12 of the individual housing shells 2 sealed flush with each other, butt joined to each other, so that extends over the entire axial length of the compressor continuous axial channel results (see Fig. 4). ends attached deflectors 36 allow the air outlet 7 a compressor stage with the air inlet nozzle 6 a subsequent compressor stage to connect to a Possible use of the continuous axial channel too mention. Another use is to Pass coolant through the channel to accumulate Dissipate heat of compression. That being said, the in this case unused passage 12 through a on the outer housing shell 2 of the impeller housing. 1 attached lid 37 (Fig. 1.5) are closed.

The cover 37 is formed with two cover parts 38, the unused air intake 6 and the also not used air outlet 7 at this Close housing shell 2 sealed. At the same time on the lid part 37 two feet 39 for the side channel compressor molded, the a flat base 40 and Have holes 41 for anchoring screws.

To the air intake 6 and the air outlet 7 of the opposite, bolted to the electric motor 4 Housing shell 2, two mufflers 42 are connected, the connecting flanges on their free ends 43 for air supply and discharge lines have (see. Fig. 3). Between the respective muffler 42 and the Housing part 9 of the associated housing shell 2 is a separate Foot part 44 (Fig. 1, 2) provided on a tubular projection 45 of the respective muffler 42nd placed and braced against the housing part 9. The Foot part 44 also has a footprint 40 and vertical holes 41 for anchoring screws. The tubular Approaches 45 are, for example, provided with an external thread and in an internal thread of the respective nozzle 6,7 screwed.

Since all housing shells 2 are identical and the one-stage or multi-stage version of the side channel compressor each axially outer housing shells 2 structurally identical air intake pipe 6 and air outlet 7 can carry the muffler 42 with the foot part 44 and the lid 37 against each other be swapped, i. that the muffler 42, related to the figures 1, 2 on the right side of the impeller housing 1 come to rest, if this is the special installation conditions of the side channel compressor appear appropriate to let. Of course, instead of the silencer 42 and / or additionally other air guide elements, eg connection pipes or hoses, valves, Pipe bends and the like occur, as is known is.

While in the illustrated embodiment, the two in each case an impeller housing 1 or 1a forming housing shells 2 by the radially outer ring 28 against each other centered, the arrangement could also be made that way be that the ring 28 on the inside of the Housing shells 2, i. arranged in the region of the side channels 5 is, so that is a similar arrangement as in the centering ring 32 between the two impeller housing 1, 1a. It should be noted that also the centering ring 32 could be located radially outward, i. corresponding the ring 28.

The impeller shaft 10 is in the illustrated two-stage Embodiment of FIG. 4 in one piece over the length the two compressor stages shown throughout and as explained, only in a single roller bearing 16th stored. But there are also conceivable embodiments in each of the two compressor stages its own impeller shaft is assigned and the waves each by a front-side driver in the form of a positive shaft coupling Coaxially connected to each other. In this Trap is the impeller shaft contained in the impeller shell 1 stored in two bearings 16, which in the two Bearing housing 14 of this impeller housing 1 are used. In the dargestellen two-stage embodiment is sufficient for the other impeller housing 1a, a single bearing, in particular by a in the electric motor 4 adjacent bearing housing 14 inserted bearings 16th is formed. The shaft coupling in the area of the interface between the two impeller housings 1, 1a is expediently designed so that they are about existing unavoidable Misalignment between the waves in the two impeller housings 1, 1a compensates.

Claims (18)

Side channel blower with an annular, two-shelled Impeller housing (1), which rotates in it stored impeller (3) encloses and with a Air intake and an air outlet (6, 7) provided is, with two identically designed housing shells (2), each of which is at its outer edge each one in the radial direction continuous plane (25) carries, wherein the housing shells (2) with their Planar surfaces (25) in a direction perpendicular to the axis of rotation (10) of the impeller (3) extending separating surface lying together in the axial direction with each other are braced and in the area of the plane surfaces (25) a ring encircling ring (28) is arranged through the two housing shells (2) centered against each other are. Side channel compressor according to claim 1, characterized in that the ring (28) is designed as a sealing ring, through which a gap present in the region of the separating surface is sealed. Side channel compressor according to one of the preceding claims, characterized in that the ring (28) consists of metal. Side channel compressor according to one of the preceding claims, characterized in that the ring (28) has a substantially rectangular or square cross-sectional shape. Side channel compressor according to claim 2, characterized in that the ring (28) has a dimensionally stable annular core, which carries a sealing layer consisting of a sealing material. Side channel compressor according to one of the preceding claims, characterized in that the ring (28) on the radially outer edge of the two planar surfaces (25) is arranged. Side channel compressor according to one of claims 1 to 5, characterized in that the ring (28) on the radially inner edge of the two planar surfaces (25) is arranged. Side channel compressor according to one of the preceding claims, characterized in that the two housing shells (2) each have an open-edged annular groove (26) in the region of their plane surface (25) and in that the two annular grooves (26) extend to a circumferentially extending channel (27). complement in which the ring (28) is arranged. Side channel compressor according to one of the preceding claims, characterized in that the two housing shells (2) are axially braced together by clamping means (at 30) arranged in the region of the two plane surfaces (25). Side channel compressor according to one of the preceding claims, characterized in that in the region of the two plane surfaces (25) in addition to the ring (28) is provided a further sealing means for gap sealing between the two planar surfaces. Side channel compressor according to one of the preceding claims, characterized in that the housing shells (2) on its outer side mating surfaces (11a, 20,24) carry, where the two-shell Luftradgehäuse (1,1a) a plurality of compression stages are accurately clamped axially with each other. Side channel compressor according to claim 11, characterized in that the adjacent impeller housings (1, 1a) of the compressor stages are centered relative to one another and only one housing shell (2) contains a bearing (16) for a shaft carrying the impellers (3). Side channel compressor according to claim 11 or 12, characterized in that the adjacent housing shells (2) by a centering ring (32) are centered against each other, which is positively inserted between the housing shells (2). Side channel compressor according to one of the preceding claims, characterized in that unused suction and an outlet (6,7) are closed by a closure means (37). Side channel compressor according to one of the preceding claims, characterized in that in each housing shell (2) opening on the opposite shell sides through-channel (12) is formed and the passage channels (12) adjacent housing shells (2) complement each other to a total continuous axial channel. Side channel compressor according to claim 11 and 15, characterized in that the total continuous axial channel deflection means (36) are associated, through which the air outlet port (6) of a compression stage with the air intake (7) is connected to another compression stage. Side channel compressor according to claim 15, characterized in that in each housing shell (2) of the passageway between the air intake and the air outlet nozzle (6; 7) is arranged. Side channel compressor according to one of the preceding claims, characterized in that it comprises foot parts (40, 44) which are connected to housing shells (2) in the regions of their air intake and air outlet ports (6, 7).

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