EP1165965B1 - Side channel compressor - Google Patents

Side channel compressor Download PDF

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Publication number
EP1165965B1
EP1165965B1 EP00920569A EP00920569A EP1165965B1 EP 1165965 B1 EP1165965 B1 EP 1165965B1 EP 00920569 A EP00920569 A EP 00920569A EP 00920569 A EP00920569 A EP 00920569A EP 1165965 B1 EP1165965 B1 EP 1165965B1
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EP
European Patent Office
Prior art keywords
side channel
cross
section
outlet port
compressor according
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP00920569A
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German (de)
French (fr)
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EP1165965A1 (en
Inventor
Dieter Rietschle
Fritz-Martin Scholz
Markus Britsche
Oliver Mayer
Reinhard Garczorz
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Rietschle Werner GmbH and Co KG
Werner Rietschle GmbH and Co KG
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Rietschle Werner GmbH and Co KG
Werner Rietschle GmbH and Co KG
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Publication of EP1165965A1 publication Critical patent/EP1165965A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D23/00—Other rotary non-positive-displacement pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D23/00—Other rotary non-positive-displacement pumps
    • F04D23/008—Regenerative pumps

Definitions

  • the invention relates to a side channel compressor according to the preamble of claim 1.
  • a generic side channel compressor is known from DE-A-876 285. With this Side channel blower tapers the cross section of the side channel from the inlet opening continuously to the outlet opening. The rejuvenation is said to improve the efficiency of the Increase the side channel blower by creating an even one in the side channel Pressure increase and an increase in volume flow results.
  • the cross section of the The side channel is approximately elliptical.
  • Another side channel compressor is known from DE 197 08 952 A1.
  • This too Side channel blower tapers the cross section of the side channel from the inlet opening continuously to the outlet opening.
  • the rejuvenation is said to improve the efficiency of the Increase the side channel blower by creating an even one in the side channel Pressure increase and an increase in volume flow results.
  • the cross section of the According to this prior art, the side channel is rectangular, but with rounded corners.
  • the object of the invention is to provide a side channel compressor with an increased To achieve efficiency.
  • the flow conditions in the side channel are in the side channel compressor according to the invention optimized by the transitions of the wall areas delimiting the cross section very much are soft, so that transitions in the real sense are missing. This is through the Elliptical shape of the side channel reached.
  • the gas flows from the blades of the compressor one, based on the blade axis, axial speed component in the Side channel and is deflected in this without causing extreme losses can. This results in a higher volume flow and a higher one Compressor capacity.
  • the elliptical formation leads to thanks to the bevels associated with it a better manufacturability of the side channel by means of sand or die casting processes.
  • the section of the side channel with an elliptical cross section can extend over the entire length extend of the side channel or only over a part.
  • the section should include elliptical cross section on about half the flow path between the inlet opening and Start exhaust opening.
  • the gas to be compressed already has one in this area experience noticeable compression to which the cross section should be adapted by is reduced.
  • the section with an elliptical cross section should end in the area of the outlet opening where there is also the highest compression.
  • the optimal performance of the compressor can only be achieved by tuning the Reduction of the cross section of the side channel to the type of gas and the efficiency of the compressor, in particular its speed, can be achieved. It is e.g. Not optimal if the cross section decreases extremely or too little, because the gas flow in the the first case is blocked and in the second case the compressibility of the gas is not complete is exploited.
  • the cross-sectional area of the side channel in the section with elliptical Cross section is according to the preferred embodiment to the ratio of Adjusted density increase of the gas by reducing the cross-sectional area accordingly becomes.
  • An optimal reduction of the cross-sectional area results if one is adopted approximately adiabatic isentropic compression of the gas to be compressed, the Cross-sectional area is reduced according to the decreasing gas volume.
  • index 1 being the specific sizes at the inlet and index 2 identifies the specific sizes at the outlet of the side channel.
  • the optimal cross-sectional areas can be found on any Determine the location of the side channel.
  • Another embodiment of the invention provides that the side channel in front of the section with an elliptical cross section has a semicircular cross section. This semicircular The cross section then changes continuously into an increasingly flat ellipse.
  • the width of the side channel should preferably remain constant over its entire length, so that the reduction in cross section only over the reduced depth, but with adapted ellipse shape.
  • the side channel is horseshoe-shaped in a side view trending so that there is a large side channel length. Extensions at the ends of the Side channels form the inlet or outlet opening.
  • the side channel compressor according to the invention can be designed in one or more stages, the cross-sectional area of the inlet opening of a subsequent stage preferably that Cross-sectional area of the outlet opening corresponds to the immediately preceding stage. In order to to prevent the gas in the side channel between successive Stages undergoes a change of state.
  • the individual stages are preferably all provided with a side channel, as before has been defined, i.e. with a continuously decreasing cross-sectional area between Inlet opening and outlet opening. Because the pressure curve with a multi-stage If the compressor is different from a single-stage compressor, the Reduction of the cross-sectional area to be adapted to this effect. So would be the same Pressure increase between the inlet and outlet of a two-stage and a one-stage Compressor in the two-stage compressor only half of the side channel taper per stage compared to that of the single-stage compressor.
  • a drive motor 10 In the side channel blower shown in FIG. 1, there is a drive motor 10, a first stage 12 and a second stage 14 integrated in one unit. With 16 a housing is designated. Impellers 20, 22 of stages 12 and 14 are attached to a drive shaft, which in turn is rotated by the drive motor 10.
  • a first housing cover 30 on the Housing 16 is screwed, has a side channel 32 of the first stage.
  • On the opposite side is connected to the housing 16, a second housing cover 26, which has a side channel 28.
  • the first stage 12 has inlet openings and Outlet openings, which will be explained with reference to Figure 2.
  • the outlet opening of the first stage is through a side channel, not shown, in the housing with the inlet opening second stage 14 connected.
  • the channel and the cross sections of the outlet opening of the first and the inlet opening of the second stage are designed so that none Cross-sectional change between the first and second stage in the area of the side channel is present.
  • the housing cover 30 is shown in FIG. 2 alone.
  • the side channel 32 formed therein is essentially horseshoe-shaped and has a 270 ° extension circular section (extending from section line A to section line E).
  • a Inlet opening 42 upstream of section line A extends over approximately 15 ° and forms one Kind of extension of the side channel 32.
  • Downstream of the section line E is also one Continuous outlet opening 44 is provided.
  • the side channel 32 has the same width from the section line A to the section line E, as can also be seen from the cutting sequence in FIG. 3, which only shows the side channel itself At the beginning, at the section line A, the side channel still has a semicircular shape Cross section, the center of the semicircle even slightly below the plane Surface 46 of the cover 30 is located, from which the side channel 32 extends into the interior of the cover extends. In FIG. 3 the distance 46 from the center M is given as 1 mm.
  • the ellipse half, the side channel defined, so to speak, is compressed with increasing length of the flow path.
  • the Decrease in cross-sectional area is the steadily reduced on the flow path specific volume of the gas to be compressed assuming an adiabatic isentropic Adjusted state change. This increases the efficiency of the side channel blower optimized.
  • the cross section of the side channel 32 which is continuous and continuous from a semicircle changed to an increasingly flat ellipse, is characterized by excellent Flow conditions in the side channel 32, since only slight flow losses occur.
  • the efficiency of the side channel blower is also so high because, as mentioned, the Cross-sectional profile of the change in state of the compressed gas is adapted.
  • FIGS A slightly modified housing cover 130 is shown in FIGS the side channel 132 has a slightly different inlet and outlet area.
  • the inlet area extends over 15 ° to 50 °, as does the outlet area.
  • Numeral 142 is the inlet of the first stage and 144 is the outlet of first stage, which leads to the inlet opening of the second stage.
  • the second stage 14 has a side channel, which is also tapered along its entire length.
  • This side channel also begins with a semicircular cross-section, whereby this Cross-section, however, has an area which corresponds to the area of the side channel at the outlet opening 44 corresponds to the elliptical cross section.
  • the side channel of the second stage then changes continuously to an increasingly flat ellipse, as shown in the figures 2 to 5 is shown.
  • FIG. 6 shows the increase that can be achieved by reducing the side channel cross section of efficiency.
  • Side channel blowers There are three different ones for the courses shown Side channel blowers have been used, which are measured at different speeds were.
  • a side channel blower labeled "Series" has one semicircular cross section without taper.
  • a modified to this Side channel compressor according to the invention with an elliptical cross section has a Cross-section reduction of 15% between inlet opening and outlet opening on and off further compressors a cross-sectional reduction of 30%.
  • Figure 6 not only shows that a significant increase in efficiency is achievable, but also that this Efficiency increase is very dependent on the speed. As explained earlier a cross-sectional reduction by 15%, for example, cannot be lead to an enormous increase in efficiency at different speeds.

Abstract

A side channel compressor comprises an inlet port (42) for gas and an outlet port (44) for compressed gas as well as a side channel (32) which provides a flow connection between the inlet port (42) and the outlet port (44), the cross-section of the side channel (32) diminishing between the inlet port (42) and the outlet port (44). The side channel (32) has at least one section in which it has a cross-section in the form of a half ellipse and in which the maximum depth of the channel (32) continuously diminishes towards the outlet port (44).

Description

Die Erfindung betrifft einen Seitenkanalverdichter nach dem Oberbegriff des Anspruchs 1.The invention relates to a side channel compressor according to the preamble of claim 1.

Ein gattungsgemäßer Seitenkanalverdichter ist aus der DE-A-876 285 bekannt. Bei diesem Seitenkanalverdichter verjüngt sich der Querschnitt des Seitenkanals von der Einlaßöffnung bis zur Auslaßöffnung kontinuierlich. Die Verjüngung soll den Wirkungsgrad des Seitenkanalverdichters erhöhen, indem sich im Seitenkanal eine gleichmäßige Drucksteigerung und eine Erhöhung des Volumenstroms ergibt. Der Querschnitt des Seitenkanals ist annähernd ellipsenförmig gewählt.A generic side channel compressor is known from DE-A-876 285. With this Side channel blower tapers the cross section of the side channel from the inlet opening continuously to the outlet opening. The rejuvenation is said to improve the efficiency of the Increase the side channel blower by creating an even one in the side channel Pressure increase and an increase in volume flow results. The cross section of the The side channel is approximately elliptical.

Ein weiterer Seitenkanalverdichter ist aus der DE 197 08 952 A1 bekannt. Auch bei diesem Seitenkanalverdichter verjüngt sich der Querschnitt des Seitenkanals von der Einlaßöffnung bis zur Auslaßöffnung kontinuierlich. Die Verjüngung soll den Wirkungsgrad des Seitenkanalverdichters erhöhen, indem sich im Seitenkanal eine gleichmäßige Drucksteigerung und eine Erhöhung des Volumenstroms ergibt. Der Querschnitt des Seitenkanals ist nach diesem Stand der Technik rechteckig, jedoch mit abgerundeten Ecken.Another side channel compressor is known from DE 197 08 952 A1. This too Side channel blower tapers the cross section of the side channel from the inlet opening continuously to the outlet opening. The rejuvenation is said to improve the efficiency of the Increase the side channel blower by creating an even one in the side channel Pressure increase and an increase in volume flow results. The cross section of the According to this prior art, the side channel is rectangular, but with rounded corners.

Aufgabe der Erfindung ist es, einen Seitenkanalverdichter mit einem gesteigerten Wirkungsgrad zu erreichen.The object of the invention is to provide a side channel compressor with an increased To achieve efficiency.

Dies wird bei einem Seitenkanalverdichter der eingangs genannten Art dadurch erreicht, daß die große Achse der Ellipse geringfügig innerhalb des Deckels des Seitenkanalverdichters liegt, der den Seitenkanal aufweist. Diese Ausbildung hat strömungstechnische Vorteile, die zu einem gesteigerten Wirkungsgrad führen. This is achieved in a side channel compressor of the type mentioned in that the major axis of the ellipse is slightly inside the cover of the side channel blower lies that has the side channel. This training has fluidic advantages that lead to increased efficiency.

Im erfindungsgemäßen Seitenkanalverdichter sind die Strömungsverhältnisse im Seitenkanal optimiert, indem die Übergänge der den Querschnitt begrenzenden Wandungsbereiche sehr weich ausgebildet sind, so daß Übergänge im eigentlichen Sinne fehlen. Dies wird durch die Ellipsenform des Seitenkanals erreicht. Das Gas strömt von den Schaufeln des Verdichters mit einer, bezogen auf die Schaufelachse, axialen Geschwindigkeitskomponente in den Seitenkanal ein und wird in diesem umgelenkt, ohne daß es zu extremen Verlusten kommen kann. Dadurch kommt es zu einem höheren Volumenstrom und einer höheren Verdichterleistung. Die elliptische Ausbildung führt dank der damit verbundenen Schrägen zu einer besseren Herstellbarkeit des Seitenkanals mittels Sand- oder Druckgußverfahren. The flow conditions in the side channel are in the side channel compressor according to the invention optimized by the transitions of the wall areas delimiting the cross section very much are soft, so that transitions in the real sense are missing. This is through the Elliptical shape of the side channel reached. The gas flows from the blades of the compressor one, based on the blade axis, axial speed component in the Side channel and is deflected in this without causing extreme losses can. This results in a higher volume flow and a higher one Compressor capacity. The elliptical formation leads to thanks to the bevels associated with it a better manufacturability of the side channel by means of sand or die casting processes.

Der Abschnitt des Seitenkanals mit elliptischem Querschnitt kann sich über die gesamte Länge des Seitenkanals erstrecken oder auch nur über einen Teil. Spätestens sollte der Abschnitt mit elliptischem Querschnitt auf etwa dem halben Strömungsweg zwischen Einlaßöffnung und Auslaßöffnung beginnen. In diesem Bereich hat nämlich das zu verdichtende Gas bereits eine merkliche Verdichtung erfahren, an die der Querschnitt angepaßt werden sollte, indem er reduziert wird.The section of the side channel with an elliptical cross section can extend over the entire length extend of the side channel or only over a part. At the latest, the section should include elliptical cross section on about half the flow path between the inlet opening and Start exhaust opening. The gas to be compressed already has one in this area experience noticeable compression to which the cross section should be adapted by is reduced.

Der Abschnitt mit elliptischem Querschnitt sollte im Bereich der Auslaßöffnung enden, wo auch die höchste Verdichtung vorhanden ist.The section with an elliptical cross section should end in the area of the outlet opening where there is also the highest compression.

Es ist zu betonen, daß die optimale Leistung des Verdichters nur durch Abstimmung der Verringerung des Querschnitts des Seitenkanals auf die Art des Gases und die Leistungsfähigkeit des Verdichters, insbesondere dessen Drehzahl, erreicht werden kann. Es ist z.B. nicht optimal, wenn sich der Querschnitt extrem stark oder zu wenig verringert, da der Gasstrom im ersten Fall blockiert wird und im zweiten Fall die Kompressibilität des Gases nicht vollständig ausgenutzt wird. Die Querschnittsfläche des Seitenkanals in dem Abschnitt mit elliptischem Querschnitt ist gemäß der bevorzugten Ausführungsform an das Verhältnis der Dichteerhöhung des Gases angepaßt, indem die Querschnittsfläche entsprechend reduziert wird. Eine optimale Verringerung der Querschnittsfläche ergibt sich bei Annahme einer annähernd adiabat isentropen Verdichtung des zu verdichtenden Gases, wobei die Querschnittsfläche entsprechend dem sich verringernden Gasvolumen reduziert wird.It should be emphasized that the optimal performance of the compressor can only be achieved by tuning the Reduction of the cross section of the side channel to the type of gas and the efficiency of the compressor, in particular its speed, can be achieved. It is e.g. Not optimal if the cross section decreases extremely or too little, because the gas flow in the the first case is blocked and in the second case the compressibility of the gas is not complete is exploited. The cross-sectional area of the side channel in the section with elliptical Cross section is according to the preferred embodiment to the ratio of Adjusted density increase of the gas by reducing the cross-sectional area accordingly becomes. An optimal reduction of the cross-sectional area results if one is adopted approximately adiabatic isentropic compression of the gas to be compressed, the Cross-sectional area is reduced according to the decreasing gas volume.

Dieser Verlauf wird wie folgt errechnet, wobei der Index 1 die spezifischen Größen am Einlaß und der Index 2 die spezifischen Größen am Auslaß des Seitenkanals kennzeichnet.This course is calculated as follows, index 1 being the specific sizes at the inlet and index 2 identifies the specific sizes at the outlet of the side channel.

Für den Verdichtungsverlauf entlang des Seitenkanals gilt m1=m2=konst. The following applies to the compression process along the side channel m 1 = m 2 = Const.

Mit der idealen Gasgleichung: pV=m RT ergibt sich P 1 V 1 T 1 = P 2 V 2 T 2 oder V2=V1• P 1 P 2 • T 2 T 1 With the ideal gas equation: pV = m RT results P 1 V 1 T 1 = P 2 V 2 T 2 or V 2 = V 1 • P 1 P 2 • T 2 T 1

Mit der zusätzlichen Bedingung C 1= C 2 = konst.
erhält man: A2=A1• P 1 P 2 • T 2 T 1 With the additional condition C 1 = C 2 = const.
you get: A 2 = A 1 • P 1 P 2 • T 2 T 1

Für eine adiabat isentrope Verdichtung gilt unter der Annahme: χ=1,4 Δp=200 mbar P1= 970 mbar T1=20 °C

Figure 00040001
T1=(20 + 273)K= 293 K. For an adiabatic isentropic compression the following applies: χ = 1.4 Δp = 200 mbar P 1 = 970 mbar T 1 = 20 ° C
Figure 00040001
T 1 = (20 + 273) K = 293 K.

Für Druckbetrieb ergibt sich:

Figure 00040002
For printing operation there is:
Figure 00040002

Für Saugbetrieb ergibt sich:

Figure 00040003
The following results for suction operation:
Figure 00040003

Daraus folgt bei Druckbetrieb ein Querschnittsverhältnis des Seitenkanals zwischen Auslaßund Einlaßöffnung: A1 A1 = P1 P2 • T2 T1 =970970+200 •390293 =87% und bei Saugbetrieb ein Querschnittsverhältnis: A2 A1 =970-200970 •312293 =85% This results in a cross-sectional ratio of the side channel between outlet and inlet opening during printing: A 1 A 1 = P 1 P 2 • T 2 T 1 = 970 970 + 200 • 390 293 = 87% and a cross-sectional ratio in suction mode: A 2 A 1 = 970-200 970 • 312 293 = 85%

Mit den obigen Formeln lassen sich die optimalen Querschnittsflächen an jeder beliebigen Stelle des Seitenkanals bestimmen. With the formulas above, the optimal cross-sectional areas can be found on any Determine the location of the side channel.

Die Optimierung des Verlaufs der Verjüngung der Querschnittsfläche über die Länge des Seitenkanals unter Annahme einer adiabat isentropen Verdichtung ist nicht zwingend auf die elliptische Seitenkanalquerschnittsform beschränkt. Vielmehr kann diese entsprechende Verringerung des Querschnitts auch bei anderen Seitenkanalformen zu einer Optimierung des Wirkungsgrades führen.Optimizing the course of the tapering of the cross-sectional area over the length of the Side channel assuming adiabatic isentropic compression is not mandatory on the elliptical side channel cross-sectional shape limited. Rather, this can be appropriate Reduction of the cross-section also with other side channel shapes to optimize the Efficiency.

Es sind zwar andere Gaszustandsänderungen in einem Seitenkanalverdichter denkbar, z.B. eine isotherme Verdichtung, jedoch hat sich die adiabat isentrope Verdichtung in diesem Zusammenhang zur Erreichung eines hohen Wirkungsgrads bewährt.Other gas state changes are conceivable in a side channel compressor, e.g. an isothermal compression, but the adiabatic isentropic compression has in this Proven connection to achieve high efficiency.

Eine weitere Ausgestaltung der Erfindung sieht vor, daß der Seitenkanal vor dem Abschnitt mit elliptischem Querschnitt einen halbkreisförmigen Querschnitt hat. Dieser halbkreisförmige Querschnitt geht dann stufenlos in eine immer flacher werdende Ellipse über.Another embodiment of the invention provides that the side channel in front of the section with an elliptical cross section has a semicircular cross section. This semicircular The cross section then changes continuously into an increasingly flat ellipse.

Die Breite des Seitenkanals sollte vorzugsweise über seine gesamte Länge konstant bleiben, so daß die Querschnittsverringerung ausschließlich über die verringerte Tiefe, jedoch mit angepaßter Ellipsenform, erfolgt.The width of the side channel should preferably remain constant over its entire length, so that the reduction in cross section only over the reduced depth, but with adapted ellipse shape.

Der Seitenkanal ist gemäß einer Ausgestaltung der Erfindung in Seitenansicht hufeisenförmig verlaufend, so daß sich eine große Seitenkanallänge ergibt. Fortsätze an den Enden des Seitenkanals bilden die Einlaß- bzw. die Auslaßöffnung.According to an embodiment of the invention, the side channel is horseshoe-shaped in a side view trending so that there is a large side channel length. Extensions at the ends of the Side channels form the inlet or outlet opening.

Der erfindungsgemäße Seitenkanalverdichter kann einstufig oder mehrstufig ausgebildet sein, wobei die Querschnittsfläche der Einlaßöffnung einer nachfolgenden Stufe vorzugsweise der Querschnittsfläche der Auslaßöffnung der unmittelbar vorhergehenden Stufe entspricht. Damit soll verhindert werden, daß das Gas in dem Seitenkanal zwischen aufeinanderfolgenden Stufen eine Zustandsänderung erfährt.The side channel compressor according to the invention can be designed in one or more stages, the cross-sectional area of the inlet opening of a subsequent stage preferably that Cross-sectional area of the outlet opening corresponds to the immediately preceding stage. In order to to prevent the gas in the side channel between successive Stages undergoes a change of state.

Die einzelnen Stufen sind vorzugsweise alle mit einem Seitenkanal versehen, wie er zuvor definiert worden ist, also mit einer sich kontinuierlich verringernden Querschnittsfläche zwischen Einlaßöffnung und Auslaßöffnung. Da der Druckverlauf bei einem mehrstufigen Verdichter anders als bei einem einstufigen Verdichter ist, muß selbstverständlich die Verringerung der Querschnittsfläche an diesen Effekt angepaßt sein. So würde bei gleicher Drucksteigerung zwischen Einlaß und Auslaß eines zweistufigen und eines einstufigen Verdichters beim zweistufigen Verdichter pro Stufe nur die Hälfte der Seitenkanalverjüngung gegenüber der des einstufigen Verdichters notwendig sein.The individual stages are preferably all provided with a side channel, as before has been defined, i.e. with a continuously decreasing cross-sectional area between Inlet opening and outlet opening. Because the pressure curve with a multi-stage If the compressor is different from a single-stage compressor, the Reduction of the cross-sectional area to be adapted to this effect. So would be the same Pressure increase between the inlet and outlet of a two-stage and a one-stage Compressor in the two-stage compressor only half of the side channel taper per stage compared to that of the single-stage compressor.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus den nachfolgenden Zeichnungen, auf die Bezug genommen wird. In den Zeichnungen zeigen:

  • Figur 1 eine Längsschnittansicht durch einen zweistufigen Seitenkanalversichter nach der Erfindung,
  • Figur 2 eine Seitenansicht eines in Figur 1 dargestellten Deckels mit einem Seitenkanal,
  • Figur 3 aufeinanderfolgende Querschnitte des Seitenkanals längs der in Figur 2 dargestellten Schnittlinien A, B, C, D und E,
  • Figur 4 eine Seitenansicht eines geringfügig modifizierten Deckels mit modifiziertem Seitenkanal,
  • Figur 5. aufeinanderfolgende Querschnitte des Seitenkanals längs der in Figur 4 dargestellten Schnittlinien A-I, und
  • Figur 6 verschiedene Wirkungsgradverläufe bei verschiedenen Drehzahlen von Seitenkanalverdichtern ohne, mit 15%iger Querschnittsverjüngung und mit 30%iger Querschnittsverjüngung.
    • Further features and advantages of the invention result from the following description and from the following drawings, to which reference is made. The drawings show:
  • FIG. 1 shows a longitudinal sectional view through a two-stage side channel compressor according to the invention,
  • FIG. 2 shows a side view of a cover shown in FIG. 1 with a side channel,
  • FIG. 3 successive cross sections of the side channel along the section lines A, B, C, D and E shown in FIG. 2,
  • FIG. 4 shows a side view of a slightly modified cover with a modified side channel,
  • Figure 5. successive cross-sections of the side channel along the section lines AI, and shown in Figure 4
  • Figure 6 different efficiency curves at different speeds of side channel blowers without, with 15% cross-sectional taper and with 30% cross-sectional taper.

    • Bei dem in Figur 1 gezeigten Seitenkanalverdichter sind ein Antriebsmotor 10, eine erste Stufe 12 und eine zweite Stufe 14 in einer Baueinheit integriert. Mit 16 ist ein Gehäuse bezeichnet. Laufräder 20, 22 der Stufen 12 bzw. 14 sind auf einer Antriebswelle befestigt, die wiederum vom Antriebsmotor 10 in Drehung versetzt wird. Ein erster Gehäusedeckel 30, der an dem Gehäuse 16 angeschraubt ist, weist einen Seitenkanal 32 der ersten Stufe auf. Auf der gegenüberliegenden Seite ist mit dem Gehäuse 16 ein zweiter Gehäusedeckel 26 verbunden, welcher einen Seitenkanal 28 aufweist. Die erste Stufe 12 hat Einlaßöffnungen und Auslaßöffnungen, die anhand von Figur 2 noch erläutert werden. Die Auslaßöffnung der ersten Stufe ist durch einen nicht gezeigten Seitenkanal im Gehäuse mit der Einlaßöffnung der zweiten Stufe 14 verbunden. Der Kanal sowie die Querschnitte der Auslaßöffnung der ersten und der Einlaßöffnung der zweiten Stufe sind so ausgebildet, daß keine Querschnittsveränderung zwischen erster und zweiter Stufe im Bereich des Seitenkanals vorliegt.In the side channel blower shown in FIG. 1, there is a drive motor 10, a first stage 12 and a second stage 14 integrated in one unit. With 16 a housing is designated. Impellers 20, 22 of stages 12 and 14 are attached to a drive shaft, which in turn is rotated by the drive motor 10. A first housing cover 30 on the Housing 16 is screwed, has a side channel 32 of the first stage. On the opposite side is connected to the housing 16, a second housing cover 26, which has a side channel 28. The first stage 12 has inlet openings and Outlet openings, which will be explained with reference to Figure 2. The outlet opening of the first stage is through a side channel, not shown, in the housing with the inlet opening second stage 14 connected. The channel and the cross sections of the outlet opening of the first and the inlet opening of the second stage are designed so that none Cross-sectional change between the first and second stage in the area of the side channel is present.

    Der Gehäusedeckel 30 ist in Figur 2 allein dargestellt. Der darin ausgebildete Seitenkanal 32 ist im wesentlichen hufeisenförmig und hat einen sich über 270° erstreckenden kreisringförmigen Abschnitt (von der Schnittlinie A bis zur Schnittlinie E reichend). Eine Einlaßöffnung 42 stromaufwärts der Schnittlinie A erstreckt sich über etwa 15° und bildet eine Art Fortsatz des Seitenkanals 32. Stromabwärts der Schnittlinie E ist ebenfalls eine fortsatzartige Auslaßöffnung 44 vorgesehen.The housing cover 30 is shown in FIG. 2 alone. The side channel 32 formed therein is essentially horseshoe-shaped and has a 270 ° extension circular section (extending from section line A to section line E). A Inlet opening 42 upstream of section line A extends over approximately 15 ° and forms one Kind of extension of the side channel 32. Downstream of the section line E is also one Continuous outlet opening 44 is provided.

    Der Seitenkanal 32 weist von der Schnittlinie A bis zur Schnittlinie E die gleiche Breite auf, wie auch anhand der Schnittsequenz in Figur 3, die nur den Seitenkanal selbst zeigt, zu sehen ist Der Seitenkanal hat zu Beginn, bei der Schnittlinie A, noch einen halbkreisförmigen Querschnitt, wobei der Mittelpunkt des Halbkreises sogar noch etwas unterhalb der ebenen Fläche 46 des Deckels 30 liegt, von der aus sich der Seitenkanal 32 in das Innere des Deckels erstreckt. In den Figuren 3 ist als Abstand der Fläche 46 vom Mittelpunkt M 1 mm angegeben. The side channel 32 has the same width from the section line A to the section line E, as can also be seen from the cutting sequence in FIG. 3, which only shows the side channel itself At the beginning, at the section line A, the side channel still has a semicircular shape Cross section, the center of the semicircle even slightly below the plane Surface 46 of the cover 30 is located, from which the side channel 32 extends into the interior of the cover extends. In FIG. 3 the distance 46 from the center M is given as 1 mm.

    Von der Einlaßöffnung 42 zur Auslaßöffnung 44 ergibt sich eine Hauptströmungsrichtung, die durch einen Pfeil in Figur 2 dargestellt ist. Auf diesem Weg wird, wie Figur 3 zu entnehmen ist, die Querschnittsfläche des Seitenkanals 32 kontinuierlich bis zur Auslaßöffnung 44 geringer. Der Abschnitt des Seitenkanals 32 von der Schnittlinie A bis zur Schnittlinie E bildet einen Abschnitt mit elliptischem Seitenkanalquerschnitt. Der Querschnitt des Seitenkanals 32 ändert sich von einem Halbkreis an der Schnittlinie A zu einer Ellipse mit immer geringer werdender Tiefe. Die Tiefe ist an der Schnittlinie B mit h1, an der Schnittlinie C mit h2, an der Schnittlinie D mit h3 und an der Schnittlinie E mit h4 dargestellt. Die Ellipsenhälfte, die den Seitenkanal definiert, wird sozusagen mit zunehmender Länge des Strömungsweges gestaucht. Die Abnahme der Querschnittsfläche ist dem auf dem Strömungsweg stetig reduzierten spezifischen Volumen des zu verdichtenden Gases unter Annahme einer adiabaten isentropen Zustandsänderung angepaßt. Dadurch wird der Wirkungsgrad des Seitenkanalverdichters optimiert.From the inlet opening 42 to the outlet opening 44 there is a main flow direction, the is represented by an arrow in Figure 2. In this way, as can be seen in FIG. 3, the cross-sectional area of the side channel 32 continuously decreases up to the outlet opening 44. The section of the side channel 32 from the section line A to the section line E forms one Section with elliptical side channel cross section. The cross section of the side channel 32 changes from a semicircle on section line A to an ellipse with ever decreasing Depth. The depth is on the section line B with h1, on the section line C with h2, on the section line D is represented by h3 and on section line E by h4. The ellipse half, the side channel defined, so to speak, is compressed with increasing length of the flow path. The Decrease in cross-sectional area is the steadily reduced on the flow path specific volume of the gas to be compressed assuming an adiabatic isentropic Adjusted state change. This increases the efficiency of the side channel blower optimized.

    Im übrigen liegt, wie anhand der Schnittsequenzen zu den Schnittlinien B bis E zu sehen ist, auch die große Achse der Ellipse um etwa 1 mm innerhalb des Deckels.Otherwise, as can be seen from the cutting sequences for the section lines B to E, also the large axis of the ellipse by about 1 mm inside the lid.

    Der Querschnitt des Seitenkanals 32, der sich stufenlos und kontinuierlich von einem Halbkreis bis zu einer immer flacher werdenden Ellipse verändert, zeichnet sich durch hervorragende Strömungsverhältnisse im Seitenkanal 32 aus, da nur geringe Strömungsverluste auftreten. Der Wirkungsgrad des Seitenkanalverdichters ist auch deswegen so hoch, weil, wie erwähnt, der Querschnittsverlauf der Zustandsänderung des verdichteten Gases angepaßt ist.The cross section of the side channel 32, which is continuous and continuous from a semicircle changed to an increasingly flat ellipse, is characterized by excellent Flow conditions in the side channel 32, since only slight flow losses occur. The The efficiency of the side channel blower is also so high because, as mentioned, the Cross-sectional profile of the change in state of the compressed gas is adapted.

    In den Figuren 4 und 5 ist ein geringfügig modifizierter Gehäusedeckel 130 dargestellt, bei dem der Seitenkanal 132 einen etwas anders gestalteten Einlaß- und Auslaßbereich hat. Der Einlaßbereich erstreckt sich über 15° bis 50°, ebenso wie der Auslaßbereich. Mit dem Bezugszeichen 142 ist die Einlaßöffnung der ersten Stufe und mit 144 die Auslaßöffnung der ersten Stufe, die zur Einlaßöffnung der zweiten Stufe führt, bezeichnet.A slightly modified housing cover 130 is shown in FIGS the side channel 132 has a slightly different inlet and outlet area. The The inlet area extends over 15 ° to 50 °, as does the outlet area. With the Numeral 142 is the inlet of the first stage and 144 is the outlet of first stage, which leads to the inlet opening of the second stage.

    Ansonsten ist in Figur 5 anhand der Schnittsequenz zu sehen, daß der Seitenkanal 132 von einem Kreisquerschnitt zu einer immer flacher werdenden Ellipsenquerschnitt wird. Otherwise it can be seen in FIG. 5 based on the cutting sequence that the side channel 132 of a circular cross-section becomes an increasingly flat elliptical cross-section.

    Die zweite Stufe 14 hat einen Seitenkanal, der ebenfalls auf seiner gesamten Länge verjüngt ist. Auch dieser Seitenkanal beginnt mit einem halbkreisförmigen Querschnitt, wobei dieser Querschnitt aber eine Fläche hat, die der Fläche des Seitenkanals an der Auslaßöffnung 44 mit dem elliptischen Querschnitt entspricht. Der Seitenkanal der zweiten Stufe verändert sich dann kontinuierlich zu einer immer flacher werdenden Ellipse, wie dies entsprechend in den Figuren 2 bis 5 dargestellt ist.The second stage 14 has a side channel, which is also tapered along its entire length. This side channel also begins with a semicircular cross-section, whereby this Cross-section, however, has an area which corresponds to the area of the side channel at the outlet opening 44 corresponds to the elliptical cross section. The side channel of the second stage then changes continuously to an increasingly flat ellipse, as shown in the figures 2 to 5 is shown.

    Figur 6 zeigt die durch die Verringerung des Seitenkanalquerschnitts erreichbare Steigerung des Wirkungsgrades. Es sind für die dargestellten Verläufe drei verschiedene Seitenkanalverdichter eingesetzt worden, die bei unterschiedlichen Drehzahlen gemessen wurden. Ein Seitenkanalverdichter, der mit "Serie" bezeichnet ist, weist einen halbkreisförmigen Querschnitts ohne Verjüngung auf. Ein hierzu modifizierter Seitenkanalverdichter nach der Erfindung mit elliptischem Querschnitt weist eine Querschnittsverringerung um 15% zwischen Einlaßöffnung und Auslaßöffnung auf und ein weiter Verdichter eine Querschnittsverringerung von 30%. Figur 6 zeigt nicht nur, daß eine deutliche Wirkungsgradsteigerung erreichbar ist, sondern auch, daß diese Wirkungsgradsteigerung sehr stark von der Drehzahl abhängig ist. Wie bereits zuvor erläutert worden ist, kann nämlich nicht pauschal eine Querschnittsverringerung um beispielsweise 15% bei unterschiedlichen Drehzahlen zu einer enormen Wirkungsgradsteigerung führen. Vielmehr ist die Querschnittsverringerung der Zustandsänderung des Gases anzupassen, die wiederum aber von den geometrischen Verhältnissen im Seitenkanal und im Laufrad sowie vom Volumenstrom und damit von der Drehzahl abhängig ist. Es kann damit durchaus sein, daß bei bestimmten Drehzahlen und bestimmten Geometrien des Laufrades samt Schaufeln wesentlich geringere oder wesentlich höhere Querschnittsverringerungen erfolgen müssen, um eine optimale Wirkungsgradsteigerung zu erreichen.FIG. 6 shows the increase that can be achieved by reducing the side channel cross section of efficiency. There are three different ones for the courses shown Side channel blowers have been used, which are measured at different speeds were. A side channel blower labeled "Series" has one semicircular cross section without taper. A modified to this Side channel compressor according to the invention with an elliptical cross section has a Cross-section reduction of 15% between inlet opening and outlet opening on and off further compressors a cross-sectional reduction of 30%. Figure 6 not only shows that a significant increase in efficiency is achievable, but also that this Efficiency increase is very dependent on the speed. As explained earlier a cross-sectional reduction by 15%, for example, cannot be lead to an enormous increase in efficiency at different speeds. Much more the reduction in cross-section must be adjusted to the change in the state of the gas, which in turn but from the geometric relationships in the side channel and in the impeller as well as from Volume flow and thus depends on the speed. It may well be that certain speeds and certain geometries of the impeller including blades smaller or significantly higher cross-sectional reductions must be made in order to to achieve optimal efficiency increase.

    Claims (10)

    1. A side channel compressor, comprising
         an inlet port (42; 142) for gas and
         an outlet port (44; 144) for compressed gas, and
         a side channel (32; 132) which provides a flow connection between the inlet port (42; 142) and the outlet port (44; 144),
         the cross-section of the side channel (32; 132) diminishing between the inlet port (42; 142) and the outlet port (44; 144), and
         the side channel (32; 132) having at least one portion in which it has a cross-section in the form of a half ellipse and in which the maximum depth of the side channel (32; 132) continuously diminishes towards the outlet port (44; 144),
         characterized in that
         the major axis of the ellipse defining the cross-section lies slightly inwardly of the cover (26, 30) of the side channel compressor which cover comprises the side channel (32; 132).
    2. The side channel compressor according to claim 1, characterized in that the portion with elliptical cross-section ends in the region of the outlet port (44; 144).
    3. The side channel compressor according to claim 1 or 2, characterized in that the portion with elliptical cross-section begins at the latest at half the distance of the flow path between the inlet port (42; 142) and the outlet port (44; 144).
    4. The side channel compressor according to any of the preceding claims, characterized in that the side channel (32; 132) has a semicircular cross-section before the portion with elliptical cross-section.
    5. The side channel compressor according to any of the preceding claims, characterized in that the width of the side channel (32; 132) remains constant along its entire length.
    6. The side channel compressor according to any of the preceding claims, characterized in that the cross-sectional area of the side channel (32; 132) is continually reduced in the portion with elliptical cross-section, corresponding to the ratio of the increase in density of the gas.
    7. The side channel compressor according to claim 6, characterized in that the cross-sectional area of the side channel (32; 132) in its portion with elliptical cross-section is diminished corresponding to the diminishing volume of gas and on the assumption of an approximately adiabatically isentropic compression of the gas to be compressed.
    8. The side channel compressor according to any of the preceding claims, characterized in that the side channel (32; 132) runs, as seen in a side view, substantially in the shape of a horseshoe.
    9. The side channel compressor according to any of the preceding claims, characterized in that the compressor is configured multi-stage and the cross-sectional area of the inlet port of a succeeding stage corresponds to the cross-sectional area of the outlet port (44; 144) of the directly preceding stage.
    10. The side channel compressor according to claim 9, characterized in that in several stages, preferably in all stages, the cross-sectional area between the outlet port (44; 144) and the inlet port (42; 142) is designed according to claims 1 to 9.
    EP00920569A 1999-03-26 2000-03-24 Side channel compressor Expired - Lifetime EP1165965B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19913950A DE19913950A1 (en) 1999-03-26 1999-03-26 Side channel blower
    DE19913950 1999-03-26
    PCT/EP2000/002624 WO2000058629A1 (en) 1999-03-26 2000-03-24 Side channel compressor

    Publications (2)

    Publication Number Publication Date
    EP1165965A1 EP1165965A1 (en) 2002-01-02
    EP1165965B1 true EP1165965B1 (en) 2003-07-30

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    EP00920569A Expired - Lifetime EP1165965B1 (en) 1999-03-26 2000-03-24 Side channel compressor

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    US (1) US6779968B1 (en)
    EP (1) EP1165965B1 (en)
    JP (1) JP2002540350A (en)
    KR (1) KR100637090B1 (en)
    CN (1) CN1119531C (en)
    AT (1) ATE246316T1 (en)
    AU (1) AU763252B2 (en)
    DE (2) DE19913950A1 (en)
    DK (1) DK1165965T3 (en)
    ES (1) ES2203451T3 (en)
    WO (1) WO2000058629A1 (en)

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    US6779968B1 (en) 2004-08-24
    DE19913950A1 (en) 2000-09-28
    ES2203451T3 (en) 2004-04-16
    EP1165965A1 (en) 2002-01-02
    WO2000058629A1 (en) 2000-10-05
    DK1165965T3 (en) 2003-11-17
    CN1345400A (en) 2002-04-17
    AU4109800A (en) 2000-10-16
    JP2002540350A (en) 2002-11-26
    AU763252B2 (en) 2003-07-17
    KR20020002406A (en) 2002-01-09
    CN1119531C (en) 2003-08-27
    DE50003108D1 (en) 2003-09-04
    ATE246316T1 (en) 2003-08-15
    KR100637090B1 (en) 2006-10-23

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