CN107850078B

CN107850078B - Side channel machine

Info

Publication number: CN107850078B
Application number: CN201680040820.0A
Authority: CN
Inventors: B.雷德马赫; H-P.瑟特; E.齐普拉斯
Original assignee: Gebr Becker GmbH
Current assignee: Gebr Becker GmbH
Priority date: 2015-07-15
Filing date: 2016-07-01
Publication date: 2020-07-28
Anticipated expiration: 2036-07-01
Also published as: DE102015111469A1; JP2018520300A; WO2017009065A1; TW201706509A; CN107850078A; EP3322901A1

Abstract

The invention relates to a side channel compressor, comprising an impeller rotatably arranged in a housing and connected to a drive shaft that can rotate about a geometric rotation axis, wherein a radially outer gap and a radially inner gap are formed between the housing and the impeller, which gaps prevent contact between the impeller and the housing during operation, and the impeller further comprises a closed outer edge and an inner edge, wherein a plurality of blades that are open in a plane extending perpendicular to the rotation axis are arranged in succession in the circumferential direction of the impeller on both axial sides, wherein the outer edge forms a circumferential wall that corresponds to a radial wall of the housing in the case of forming the radially outer gap. In the radially outer gap between the outer edge of the impeller and the radial wall of the housing wall, a sealing strip having a flat side is bonded in the circumferential direction, the material of which is slightly worn when contact with the rotating impeller is likely to occur, thereby preventing the impeller from locking up on the housing, the flat side of the sealing strip extending along the radial wall of the housing and the outer edge of the impeller.

Description

Side channel machine

Technical Field

The invention relates firstly to a side channel compressor having an impeller which is rotatably arranged in a housing and which is connected to a drive shaft which can rotate about a geometric axis of rotation, wherein the impeller is positioned in the housing such that a radially outer gap and a radially inner gap are produced between the housing and the impeller, which gaps prevent contact between the impeller and the housing during operation, wherein the impeller further has a closed outer edge and an inner edge, and a plurality of blades which are open in a plane extending perpendicularly to the axis of rotation are arranged one behind the other in the circumferential direction of the impeller on both axial sides, and the outer edge forms a circumferential wall which, with the formation of the radially outer gap, corresponds to a radial wall of the housing.

The invention also relates to a side channel machine, for example a side channel compressor or a side channel vacuum pump, having an impeller with a geometric axis of rotation and a housing, wherein the impeller is arranged radially outside in the circumferential direction of the impeller, in succession, a plurality of blades which are open towards a plane extending perpendicularly to the axis of rotation and an outer circumferential wall which extends radially outside these blades, wherein the housing further has a radial wall which faces the outer circumferential wall, a gap being formed between the radial wall and the circumferential wall.

Background

Side channel compressors or side channel machines of the above-mentioned type are known. Such a side channel compressor or side channel machine may be implemented as a two-stage compressor or a two-stage pump. In this case, the passages connecting the impeller on both axial sides, so-called "side passages", are flowed through one after the other (in sequence) by means of a corresponding design of the housing parts. In the case of a single-stage construction or single-stage use of the side channel compressor or side channel machine, the two channels work in parallel.

In the case of a two-stage embodiment, different pressure levels are present in the channel on the two axial impeller sides, since the pressure in the channel increases continuously with the distance traveled. An undesirable leakage flow can thus occur through the sealing gap between the housing and the impeller, in particular from the passage forming the second stage to the passage forming the first stage. This can adversely affect maximum efficiency and temperature variations in the side channel machine.

Due to manufacturing tolerances of all components, a relatively large-sized gap must be provided on the radial outside as well as on the radial inside of the impeller relative to the housing. Radial gap dimensions of 0.5 to 0.7mm are known here. This ensures that, even in the case of an unfavorable combination of components within their permissible tolerance ranges, the gap is so large that the impeller does not come into contact with the housing part even in the event of pressure and temperature loads occurring during operation. Contact may cause the impeller to lock, potentially resulting in complete damage to the side channel machine.

DE 102005040305 a1 discloses a side channel compressor in which the wall defining the gap between the impeller and the housing is roughened or provided with grooves for the purpose of a sealing function. Comparable prior art is also known from document FR 2664333. DE 7418776U discloses that, in order to increase the sealing of the gap, the impeller is surrounded by a plastic layer with a U-shaped cross section or is arranged on the housing wall.

Disclosure of Invention

With reference to the known prior art, the technical problem to be solved by the invention is to improve a side channel compressor or a side channel machine of the aforementioned type in an advantageous manner, so that the efficiency is increased.

The object is achieved by the invention in that one or more sealing strips with flat sides are bonded in the circumferential direction in a radially outer gap between the closed outer edge of the impeller and the radial wall of the housing wall, the material of which is slightly worn when contact with the rotating impeller may occur and thus prevents the impeller from locking on the housing, wherein the flat sides of the sealing strips extend along the radial wall of the housing and the outer edge of the impeller.

The object is also achieved by the invention in that a plastic sealing strip is bonded to the radial wall and/or the circumferential wall, said plastic sealing strip having two flat sides and two narrow sides, wherein an adhesive layer is arranged only on one of the flat sides, said adhesive layer having an adhesive effect with the housing or the impeller, and the opposite flat side is opposite the circumferential wall or the radial wall.

The object is also achieved by the invention in that one or more sealing strips with flat sides are bonded in the circumferential direction in the radially outer gap between the closed outer edge of the impeller and the radial wall of the housing wall, the material of which is slightly worn when contact with the rotating impeller may occur and thus prevents the impeller from locking on the housing, wherein the flat sides of the sealing strips extend along the radial wall of the housing and the outer edge of the impeller.

The object is finally achieved by the invention in that one or more sealing strips with flat sides are bonded in the circumferential direction in a radially outer gap between the closed outer edge of the impeller and the radial wall of the housing wall, the material of which is slightly worn when contact with the rotating impeller is possible and thus prevents the impeller from locking on the housing, wherein the flat sides of the sealing strips extend along the radial wall of the housing and the outer edge of the impeller and the sealing strips are arranged at the same gap position both on the radial wall and/or on the counter wall and on the outer circumferential wall and/or on the inner circumferential wall.

By arranging in the gap (sealing gap) a material which is prone to wear on contact without generating large frictional forces there, the structurally defined gap between impeller and housing can be significantly reduced, for example from 0.5 to 0.7mm to 0.2 to 0.4 mm. This can significantly improve efficiency. The solution proposed by the invention is particularly simple and inexpensive when sealing strips, in particular plastic sealing strips, are used.

This reduces the clearance without risking damage to the equipment when the impeller is started. The impeller is free to rotate when it is started, if necessary, by stripping off the sealing strip material, wherein the sealing strip material may be stripped off to a different extent, and possibly partially, as viewed in the circumferential direction of the sealing strip material.

The sealing strip, in particular the plastic sealing strip, can be provided with an adhesive layer on one of its planar sides extending in the circumferential direction of the radial wall and/or the circumferential wall. To this end, a self-adhesive sealing strip is provided.

The sealing strip is fixed in the circumferential direction on the circumferential wall of the impeller or on the radial wall of the housing by means of an adhesive layer, wherein the flat side opposite the adhesive layer faces the circumferential wall when the sealing strip is fixed on the radial wall and faces the radial wall of the housing when the sealing strip is fixed on the circumferential wall.

The thickness of the sealing strip, defined by the spacing of the planar sides from each other, may be equal over the entire length of the sealing strip in use, before the machine is put into operation for the first time. As the side channel machine is first put into service, different strip thicknesses may result, viewed in the circumferential direction, due to wear that may occur.

A significantly lower outlet temperature can be achieved by arranging one or more sealing strips. In addition, the bearing load of the impeller is reduced. In addition, the member for reducing the clearance can be easily installed or remanufactured both during the manufacturing process of the side channel machine and while providing service.

In a further development, it can be provided that an inner circumferential wall, which extends on the first side and on the second side of the impeller in each case, is formed on the radially inner side of the blade, wherein a hub is also connected to the inner circumferential wall on the radially inner side, and the housing has a counter wall, which is axially opposite on the radially inner side and on the radially outer side relative to the circumferential wall, between which counter wall and the inner circumferential wall a radially inner gap is formed. As in the region of the radially outer gap, the leakage flow can also be regulated in the region of the radially inner gap when the side channel machine is in operation.

In order to further increase the efficiency and, if necessary, to improve the temperature change, one or more sealing strips associated with the radially inner gap are additionally provided in relation to one or more sealing strips located in the radially outer gap. The sealing strip associated with the radially inner gap can, for example, preferably be of the same design as the sealing strip associated with the radially outer gap, which is particularly relevant with regard to the thickness which is not affected and with regard to the axial width of the sealing strip. Furthermore, the sealing strips for the radially outer gap and for the radially inner gap are preferably made of the same material, in particular plastic.

The seal strip is bonded to the surface of the radial wall or the corresponding wall, or the surface of the outer circumferential wall or the inner circumferential wall of the impeller in a planar manner. The respective wall surface of the housing or of the impeller is not structurally specially pretreated for the purpose of fixing the sealing strip, for example by means of a substantially bag-shaped groove for the additional fixing of the sealing strip.

The arrangement of one or more sealing strips may be chosen differently. The sealing strip can thus be fastened to the radial wall of the housing and/or to a corresponding wall of the housing, so that the flat side of the sealing strip opposite the adhesive surface interacts with the outer circumferential wall and/or the inner circumferential wall of the impeller.

The sealing strip can also be fixed to the outer circumferential wall and/or the inner circumferential wall of the impeller. During operation of the machine, the flat side of the sealing strip opposite the adhesive surface interacts with the radial wall and/or the counter wall of the housing.

In a further possible embodiment, sealing strips can be provided which are fastened in part to the radial wall of the housing and/or to one or more corresponding walls of the housing and in part to the outer circumferential wall and/or to the inner circumferential wall of the impeller. This alternating arrangement can be either an arrangement axially one above the other in the region of one gap or an alternating arrangement in respect of the inner gap and the outer gap. Thereby, for example, in the region of the inner gap, a sealing strip can be fixed on the impeller side, and in the region of the outer gap, one or more sealing strips can be arranged on the circumferential wall of the housing. An arrangement and fixing of the sealing strip opposite to the arrangement described above is also possible.

Furthermore, for example, two sealing strips which are spaced apart from one another in the axial direction can be provided in the outer gap region, wherein one sealing strip can be arranged on the radial wall of the housing and one sealing strip can be arranged on the circumferential wall of the impeller. This alternating arrangement can also be provided in the region of the radially inner gap.

In a further alternative arrangement, it can be provided that the sealing strips are arranged at the same gap position both on the radial wall and/or on the counter wall and on the outer circumferential wall and/or on the inner circumferential wall. The sealing strip is accordingly arranged such that the flat side of the sealing strip opposite the bonding region is opposite the flat side of the radially opposite sealing strip arranged in the gap, or at least partially bears against it in the circumferential direction. These sealing strips, which face one another, in particular are made of plastic, can wear against one another during operation of the machine.

In a further preferred embodiment, two sealing strips are arranged in the gap, in particular in the radially outer gap, each of these sealing strips being assigned to one of the axially opposite edge regions of the impeller. The seal strips may be arranged to extend from regions respectively bounding the impellers in the axial direction toward the axially inner side. The sealing strip can thereby be further arranged such that the axially outer narrow side of the sealing strip extends at least approximately in the plane of the corresponding axial edge region of the impeller. The other narrow side is arranged axially inward from there. The sealing strip can also be arranged above or below the plane with a tolerance range of 1mm with respect to the substantially planar same orientation.

The sealing strip may be provided with a self-adhesive layer. Thus, the associated sealing strip may have an acrylic layer or a silicone layer. Furthermore, the sealing strip can be provided with a special adhesive, for example a two-component adhesive, if appropriate after activation of the corresponding surface.

In a possible embodiment, the sealing strip consists of Polytetrafluoroethylene (PTFE). The wear of the PTFE advantageously additionally produces a dry lubricant film between the impeller and the running surface of the housing. Furthermore, the sealing strip can also be made of another plastic material, for example of perfluoroethylene propylene copolymer (FEP), polyimide or also of Polyetheretherketone (PEEK).

Drawings

The invention is further elucidated below by means of the accompanying drawings, which only show embodiments. Features which are described in only one of the embodiments and which are replaced by further features in further embodiments for the sake of specificity, are thus described as the most feasible features for further embodiments. In the drawings:

FIG. 1 shows a perspective view of a side channel compressor or side channel machine;

FIG. 2 shows a top view, partially in cross-section, of the impeller region surrounded by the casing;

FIG. 3 shows an enlarged view of region III in FIG. 2;

FIG. 4 shows a cross-sectional view substantially in accordance with FIG. 3 without the impeller shown, but with a cross-section of the impeller in a direction of rotation offset from that of FIG. 3;

FIG. 5 shows a perspective view of the impeller;

fig. 6 shows a schematic view of the section in fig. 3, wherein sealing strips are arranged on the housing-side circumferential wall and the corresponding wall;

fig. 7 shows a representation corresponding to fig. 6, in which sealing strips are arranged on the radially outer circumferential wall and the radially inner circumferential wall of the impeller;

fig. 8 shows a representation which otherwise corresponds to fig. 6, in which sealing strips are arranged on the radially outer surface which delimits the gap;

fig. 9 shows a representation corresponding to fig. 8, wherein, however, a sealing strip is arranged on the radially inner side of the surface delimiting the gap;

FIG. 10 shows a view otherwise corresponding to FIG. 6, in which the sealing strips are arranged alternately, viewed in the axial direction;

fig. 11 shows the representation according to fig. 6 in a further embodiment, in which sealing strips are arranged at the same gap position both on the circumferential wall of the impeller and on the radial wall and the corresponding wall of the housing.

Detailed Description

Referring initially to fig. 1 and 2, a side channel machine 1 in the form of a side channel compressor is shown and described having an impeller 2 and a housing 3 surrounding the impeller.

The impeller 2 is connected in a torque-proof manner in the region of the hub 4 to a drive shaft, not shown in detail, which is rotatable about a geometric axis of rotation x.

The shaft of the impeller 2 may be driven by a motor 17.

The impeller 2 is provided radially outside with blades 5 arranged one after the other in the circumferential direction of the impeller. Viewed in the axial direction, a plurality of circumferentially successive blades 5 are formed on both sides of the impeller 2, wherein the blades 5 each open toward a respective plane of the impeller 2 perpendicular to the axis of rotation x.

A channel 6 is formed in the housing in an annular manner above the vane 5, which channel 6 is likewise arranged concentrically to the axis of rotation x, like the vane 5. This results in a two-stage side channel compressor.

Radially outside the blades 5, the impeller 2 forms an outer circumferential wall 7, which outer circumferential wall 7 extends parallel to the axis of rotation x with reference to the sectional view according to fig. 3.

Radially inside the blades 5, an inner circumferential wall 8 is also formed in the same direction as the outer circumferential wall 7, which inner circumferential walls 8 are spaced apart from one another in the axial direction by a connecting section 9 to the hub 4.

The outer circumferential wall 7 is associated with a circumferential radial wall 10 of the housing 3 radially on the outside with reference to the axis of rotation x. The radial wall 10 may for example preferably extend over the same axial length as the outer circumferential wall 7.

A radially outer gap 11 is formed between the radial wall 10 and the outer circumferential wall 7.

The inner circumferential wall 8 of the impeller 2 is also assigned a housing-side counter wall 12 in an opposing manner. Radially inside, viewed from the axis of rotation x, the corresponding wall 12 covers the inner circumferential wall 8.

The counter wall may also, for example, preferably extend over the same axial length as the inner circumferential wall 8 of the impeller 2 facing the counter wall.

Two inner gaps 13 spaced apart from one another in the axial direction are formed between the inner circumferential wall 8 of the impeller 2 and the corresponding wall 12 of the housing 3.

The radial gap dimension, i.e. the radial distance between the outer or inner

circumferential wall

7, 8 and the associated housing wall, is 0.5 to 0.7mm both in the region of the outer gap 11 and in the region of the inner gap 13.

In order to reduce the gap size at least in sections and thus minimize the leakage flow between the channels 6 during operation of the side channel machine 1, a sealing strip 14 is arranged in particular in the outer gap 11 and also in the region of the inner gap 13 in the embodiment shown as well.

Each sealing strip 14 has first of all two planar sides 15 which are spaced apart from one another and run parallel to one another, and two narrow side faces 16, as shown in fig. 6, which narrow side faces 16 are oriented perpendicular to the planar sides 15 with reference to the cross section.

The spacing of the narrow side faces 16 from one another defines the width of the sealing strip, viewed in the axial direction, which is smaller than the length, viewed in the axial direction, of the

respective gap

11 or 13.

In the embodiment shown, the width of the sealing strip 14 corresponds approximately to 1/5 to 1/6 of the width of the

outer gap

11 or 7/10 to 8/10 of the width of the inner gap 13.

The sealing strips 14 are each arranged in the gap 11 and/or the gap 13 around the axis of rotation x.

As shown in the exemplary embodiment, two sealing strips 14 can be arranged in the region of the outer gap 11, which strips are spaced apart from one another in the axial direction. For this purpose, it is also possible to provide only one sealing strip 14 in the region of the outer gap 11, for example approximately in the middle of the axial extent of the outer circumferential wall 7 of the impeller 2. Furthermore, sealing strips 14 can be provided in the region of the two inner gaps 13, respectively, alternatively in only one of the inner gaps 13.

In the preferred embodiment, as shown in the drawing, these sealing strips 14 are associated with axially opposite edge regions of the impeller 2, so that the axially outer narrow-face side 16 of each sealing strip 14 is at least approximately flush with the plane of the impeller 2, toward which the blades 5 open. Proceeding from there, the other narrow-side 16 of the sealing strip 14 is arranged axially inside.

Each sealing strip 14 is preferably a plastic sealing strip, such as a PTFE sealing strip. An adhesive layer, not shown, for example a self-adhesive layer, is provided on one of the planar sides 15 for fixing the sealing strip 14 to the facing wall.

Fig. 6 to 11 show schematic views in which the radial gap size is shown too wide to clearly show the arrangement of the sealing strip 14. Specifically, by arranging the sealing strip 14, a reduced gap size of 0.2 to 0.4mm is formed in said region.

Due to manufacturing tolerances, the

gaps

11 and 13 must be designed with relatively large dimensions, for example, of 0.5 to 0.7mm, in particular in the region of the radial wall 10 and/or the counter wall 12 of the housing 3 and in the region of the inner and outer

circumferential walls

7, 8 of the impeller 2. By placing the sealing strip 14 in the sealing gap, the gap width can be reduced to, for example, 0.2 to 0.4mm, wherein the material of the sealing strip 14 (possibly only in a partial circumferential direction) is worn away when coming into contact with the impeller 2 or with the corresponding housing wall, but no large frictional forces are generated in this case.

Different adhesive fastening means can be selected for the sealing strip 14. In the embodiment according to fig. 3, the illustration in fig. 4 and the schematic illustration in fig. 6, the sealing strip 14 is thus fixed to the housing wall. In this way, each sealing strip 14 is fixed, preferably over the entire surface, to the radial wall 10 and also to the corresponding wall 12 by means of the flat side provided with adhesive. The flat side 15 of each sealing strip 14 opposite the adhesive surface faces the outer circumferential wall 7 or the inner circumferential wall 8 of the impeller 2 facing the flat side, if appropriate abuts against the outer circumferential wall 7 or the inner circumferential wall 8, or maintains the aforementioned reduced gap at least after the first start of operation of the side channel machine 1.

According to the illustration in fig. 7, all sealing strips 14 can also be arranged only on the impeller side. In this embodiment, the sealing strip 14 is thus fastened with its planar side provided with adhesive to the outer circumferential wall 7 and the inner circumferential wall 8 of the impeller 2. The flat side 15 of the sealing strip 14 facing away from the adhesive side faces the radial wall 10 and the corresponding wall 12 of the housing 3 facing this flat side.

In a further exemplary embodiment, the sealing strip 14 is fastened, as viewed along the axis of rotation x, to the radially outward wall of the gap 11 and of the gap 13, respectively, in such a way that the sealing strip 14 is fastened to the radial wall 10 of the housing 3 in the region of the outer gap 11 and to the inner circumferential wall 8 of the impeller 2 in the region of the inner gap 13 (see fig. 8).

Fig. 9 shows a further arrangement in which, on the basis of the axis of rotation x, the sealing strips 14 are arranged on the wall surfaces of the

gaps

11 and 13 which are each directed radially inwards. In this way, the sealing strip 14 is adhesively fixed to the outer circumferential wall 7 of the impeller 2 in the outer gap 11, and the sealing strip 14 is adhesively fixed to the corresponding wall 12 of the housing 3 in the region of the inner gap 13.

The seal strips 14 may also be arranged alternately on the radially inner and radially outer side wall portions of the gap as viewed in the axial direction based on the outer gap 11 or based on a combination of the inner gaps 13 (see fig. 10). In this way, for example, the sealing strips 14 corresponding to the plane in which the blades 5 of the impeller are open are fixed on the impeller side to the respective circumferential wall, and the axially opposite sealing strips 14 are fixed to the corresponding housing wall (radial wall 10 and corresponding wall 12).

Furthermore, in each case a sealing strip 14 is fastened to the axial gap position both on the radially outer side wall of the gap and on the radially inner side wall of the gap, the flat sides of the sealing strips 14 facing away from the respective adhesive surfaces being aligned with one another, preferably overlapping in radial projection. The sealing strips 14 can at least partially abut one another, as seen in the circumferential direction, if necessary because the side channel machine 1 is subjected to wear during initial use after the assembly of the unaffected sealing strips 14.

The foregoing embodiments serve to illustrate the invention encompassed by the present application as a whole, which improves the prior art individually and also independently at least by the following technical feature combinations, namely:

a side channel compressor, characterized in that in a radially outer gap 11 between a closed outer edge of the impeller 2 and a radial wall 10 of the casing wall, one or more sealing strips 14 having a flat side 15 are bonded in the circumferential direction, the material constituting the one or more sealing strips 14 being slightly worn when possible contact with the rotating impeller 2 and thereby preventing the impeller 2 from locking up on the casing 3, wherein the flat side 15 of the sealing strips 14 extends along the outer edges of the radial wall 10 of the casing 3 and the impeller 2.

A side channel machine, characterized in that a plastic sealing strip 14 is glued onto the radial wall 10 and/or the circumferential wall 7, said plastic sealing strip 14 having two planar sides 15 and two narrow side faces 16, wherein an adhesive layer is arranged on only one of the planar sides 15, said adhesive layer bringing about an adhesive effect with the housing 3 or the impeller 2, and the opposite planar side 15 is opposite the circumferential wall 7 or the radial wall 10.

A side channel compressor or a side channel machine, characterized in that an inner circumferential wall 8 extending on a first side and a second side of an impeller 2, respectively, is configured radially inside the blade 5, wherein a hub 4 is further connected on the inner circumferential wall 8 radially inside, and the housing 3 has a corresponding wall 12 axially opposite on the radially inside and radially outside with respect to the circumferential wall 8, a radially inner gap 13 being formed between the corresponding wall 12 and the inner circumferential wall 8.

A side channel compressor or a side channel machine, characterized in that one or more sealing strips 14 associated with the radially inner gap 13 are additionally provided in relation to one or more sealing strips 14 located in the radially outer gap 11.

A side channel compressor or machine, characterized in that said sealing strip 14 is fixed to said radial wall 10 and/or to said corresponding wall 12.

A side channel compressor or machine, characterized in that the sealing strip is fixed to the outer circumferential wall 7 and/or the inner circumferential wall 8 of the impeller 2.

A side channel compressor or machine, characterized in that these sealing strips 14 are fixed partly to said radial wall 10 and/or to said counter wall 12 and partly to said outer circumferential wall 7 and/or to said inner circumferential wall 8.

A side channel compressor or a side channel machine, characterized in that the sealing strips 14 are arranged at the same gap position both on the radial wall 10 and/or on the counter wall 12 and on the outer circumferential wall 7 and/or on the inner circumferential wall 8.

A side channel compressor or a side channel machine, characterized in that two sealing strips 14 are arranged in the

gaps

11, 13, each of these sealing strips 14 being assigned to one of the axially opposite edge regions of the impeller 2.

A side channel compressor or machine, characterized in that the sealing strip 14 is provided with a self-adhesive layer.

A side channel compressor or machine, characterized in that the sealing strip 14 consists of PTFE.

All features disclosed (by themselves and in combination with one another) are of inventive significance or inventive value. The disclosure of the associated/subordinate priority documents (prior application) is also fully included in the disclosure of the present application.

List of reference numerals

1 side channel machine

2 impeller

3 case

4 wheel hub

5 blade

6 channel

7 outer circumferential wall

8 inner side circumferential wall

9 connecting section

10 radial wall

11 outer side gap

12 corresponding wall

13 inner side gap

14 sealing strip

15 plane side

Side of 16 narrow side

17 electric motor

x axis of rotation

Claims

1. A side channel machine (1), the side channel machine (1) having an impeller (2) with a geometric rotation axis (x) and a housing (3), wherein the impeller (2) is arranged radially outside in the circumference of the impeller successively with a plurality of blades (5) which are open towards a plane extending perpendicular to the rotation axis (x) and an outer circumferential wall (7) which extends radially outside of these blades (5), wherein the housing (3) further has a radial wall (10) facing the outer circumferential wall (7), a radially outer gap (11) being formed between the radial wall (10) and the outer circumferential wall (7), characterized in that,

a plastic sealing strip (14) is bonded to the radial wall (10), the plastic sealing strip (14) having two planar sides (15) and two narrow side surfaces (16), wherein an adhesive layer is arranged only on one of the planar sides (15), said adhesive layer having an adhesive effect with the housing (3), and the opposite planar side (15) is opposite the outer circumferential wall (7),

or a plastic sealing strip (14) is bonded to the outer circumferential wall (7), the plastic sealing strip (14) having two planar sides (15) and two narrow side surfaces (16), wherein an adhesive layer is arranged only on one of the planar sides (15), said adhesive layer bringing about an adhesive effect with the impeller (2), and the opposite planar side (15) is opposite the radial wall (10),

or a plastic sealing strip (14) is bonded to both the radial wall (10) and the outer circumferential wall (7), the plastic sealing strip (14) having two planar sides (15) and two narrow side faces (16), wherein an adhesive layer is arranged only on one of the planar sides (15), said adhesive layer having an adhesive effect with the housing (3) and the impeller (2).

2. A side channel machine according to claim 1, characterized in that an inner circumferential wall (8) extending on the first and second side of the impeller (2) respectively is configured radially inside the blade (5), wherein a hub (4) is further connected to the inner circumferential wall (8) radially inside, and the housing (3) has a corresponding wall (12) axially opposite on the radially inside and radially outside with respect to the inner circumferential wall (8), a radially inner gap (13) being formed between the corresponding wall (12) and the inner circumferential wall (8).

3. A side channel machine according to claim 2, characterized in that one or more plastic sealing strips (14) associated with the radially inner gap (13) are additionally provided in relation to one or more plastic sealing strips (14) located in the radially outer gap (11).

4. Side channel machine according to claim 2, characterized in that said plastic sealing strip (14) is fixed to said radial wall (10) and/or to said counter-wall (12).

5. A side channel machine according to claim 2, characterized in that the plastic sealing strip is fixed to the outer circumferential wall (7) and/or the inner circumferential wall (8) of the impeller (2).

6. Side channel machine according to claim 1, characterized in that the plastic sealing strip (14) is provided with a self-adhesive layer.

7. A side channel machine according to claim 1, wherein said plastic sealing strip (14) is made of PTFE.

8. Side channel machine according to claim 1, characterized in that the side channel machine (1) is a side channel compressor or a side channel vacuum pump.