DE1628394C3

DE1628394C3 - Liquid ring compressor

Info

Publication number: DE1628394C3
Application number: DE19681628394
Authority: DE
Inventors: Udo 2211 Heiligenstedten Segebrecht
Original assignee: Siemen and Hinsch GmbH
Current assignee: Siemen and Hinsch GmbH
Priority date: 1968-01-20
Filing date: 1968-01-20
Publication date: 1973-09-20
Also published as: DE1628394A1; DE1628394B2

Description

sehen ihr und dem Flügelrad nur ein sehr kleiner Spalt verbleibt, bringt diese schmale gerade Kante oder Fase den Vorteil, daß die radial äußere Kontur der radial äußeren Begrenzungskante der Ausströmöffnung unabhängig von der Bearbeitung gleich bleibt. Ist diese Fase oder Kante nicht vorhanden, so muß man an die Guß- und Fertigungsgenauigkeit hohe Anforderungen stellen, ist sie vorhanden, kann man der Gießerei und der Fertigung die üblichen Toleranzen zubilligen. Es hat sich gezeigt, daß diese schmale gerade Kante bzw. Fase, die weniger als ein Millimeter Breite aufweisen sollte, keinen nachteiligen Einfluß hat.if you and the impeller only see a very small gap remaining, bring this narrow straight edge or chamfer has the advantage that the radially outer contour of the radially outer boundary edge of the outflow opening remains the same regardless of processing. If this bevel or edge is not present, so you have to make high demands on the casting and manufacturing accuracy, it is available, can the foundry and production are allowed to tolerate the usual tolerances. It has been shown that this narrow straight edge or bevel, which should be less than a millimeter wide, does not have any disadvantageous Has influence.

Es sei noch erwähnt, daß die erfindungsgemäße Ausbildung der radial äußeren Begrenzung der Ausströmöffnung sich nicht unbedingt in Umfangsrichtung gesehen über die ganze Breite der Ausströmöffnung erstrecken muß. Es kann ausreichen, wenn sie sich über einen Teil der Ausströmöffnung erstreckt, insbesondere über den im Umlauf von den Flügeln zuerst erreichten Teil.It should also be mentioned that the inventive design of the radially outer boundary of the outflow opening not necessarily seen in the circumferential direction over the entire width of the outflow opening must extend. It may be sufficient if it extends over part of the discharge opening, in particular over the part reached first by the wings in circulation.

Zwar ist es bekannt (österreichische Patentschrift 69 274), bei einer Vielzahl kleiner öffnungen, die der eigentlichen Ausströmöffnung in Umlaufrichtung vorgeschaltet sind, die dem Flügelrad zugekehrten Kanten abzurunden; jedoch dient diese bekannte Ausführung dazu, den Abfluß des Mediums zu erleichtern, ohne den Rückfluß zu begünstigen. Bei der eigentlichen Ausströmöffnung ist eine solche Abrundung nicht vorgesehen. Da die bei der bekannten Ausführung durch die Abrundung erzielte Wirkung völlig anders ist als die erfindungsgemäß zu erzielende Wirkung, konnte die Erfindung durch die bekannte Ausführung nicht nahegelegt werden.Although it is known (Austrian patent specification 69 274), with a large number of small openings that the actual outflow opening are connected upstream in the direction of rotation, which face the impeller Round edges; however, this known design serves to facilitate the drainage of the medium, without promoting reflux. There is such a rounding off at the actual outflow opening not provided. Because the effect achieved in the known design by the rounding is completely different from the effect to be achieved according to the invention, the invention was able to use the known Execution should not be suggested.

An Hand der Zeichnungen sei die Erfindung beispielsweise erläutert.The invention is explained by way of example with the aid of the drawings.

F i g. 1 zeigt eine Draufsicht auf die seitliche Begrenzungswand eines Flügelrades einer Flüssigkeitsring-Gaspumpe mit Ein- und Ausströmöffnungen für das Fördermedium;
F i g. 2 und F i g. 3 zeigen Schnitte gemäß LinieF i g. 1 shows a plan view of the lateral boundary wall of an impeller of a liquid ring gas pump with inflow and outflow openings for the conveying medium;
F i g. 2 and F i g. 3 show sections according to the line

ίο A/B nach Fig. 1.ίο A / B according to Fig. 1.

In Fig. 1 ist das vor der Zeichenebene liegende Flügelrad mit der Nabe 4 und den Flügeln 5 strichpunktiert angedeutet. Das Fördermedium gelangt in die Flügelradzellen durch die Eintrittsöffnung 2 und verläßt die Flügelradzellen durch die seitlich vom Flügelrad angeordnete radial im Bereich der Radflügel liegende Ausströmöffnung 3. Beide öffnungen befinden sich in der seitlich vom Flügelrad angeordneten Wand 1.In Fig. 1, the impeller lying in front of the plane of the drawing with the hub 4 and the blades 5 is dash-dotted indicated. The pumped medium enters the impeller cells through the inlet opening 2 and leaves the impeller cells through the one arranged to the side of the impeller radially in the area of the impeller blades Lying outflow opening 3. Both openings are located in the side of the impeller Wall 1.

Die radial äußere Begrenzungskante 3 α dieser Ausströmöffnung 3 ist, wie in den F i g. 2 und 3 deutlich dargestellt, mit einer Rundung bzw. Abschrägung 3 c versehen. Die Rundung bzw. Schrägung 3 c mündet dann schließlich ein in die senkrecht zur Ebene des Flügelrads laufende Kante 3 b der Ausströmöffnung. The radially outer delimiting edge 3 α of this outflow opening 3 is, as shown in FIGS. 2 and 3 clearly shown, provided with a rounding or bevel 3 c . The rounding or inclination 3 c then finally opens into the edge 3 b of the outflow opening running perpendicular to the plane of the impeller.

Aus den F i g. 2 und 3 läßt sich deutlich die erwähnte schmale gerade Kante oder Fase 3 α ersehen, die an der radial äußeren Begrenzung der Ausströmöffnung 3 vor Beginn der Schrägung oder Rundung 3 c auf der dem Flügelrad zugewandten Seite vorgesehen ist.From the F i g. 2 and 3 can clearly see the mentioned narrow straight edge or bevel 3 α , which is provided on the radially outer boundary of the outflow opening 3 before the start of the incline or rounding 3 c on the side facing the impeller.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 2 adapt the table to the respective operating conditions. In addition, it has been shown that the optimal patent claims: Course of the radially outer limitation of the outflow opening for the different pressure conditions

1. Liquid ring compressor with at least 5 different.

an impeller, the vane cells of which are closed. At a high pressure ratio, the compressor is supplied with an outflow opening for the conveying fluid, and it is therefore necessary, and part of the operating fluid, for a corresponding amount of this holding control disk to be open, with the Operating fluid on the pressure side of the compression outflow opening to the side of the impeller in the operator through the outflow opening together with the area where the blades are located to expel the gas that has been identified as a result. It can be characterized that the radially outer boundary on the outer, sharp boundary edge of the outward edge (3 b) of the outflow opening (3) beveled on the side facing the flow opening directly next to the impeller (4) or high flow velocities arise, so that is rounded. . 15 local cavitation here with the known harmful

2. Liquid ring compressor according to claim 1 and destructive phenomena occurs. Also characterized in that on the radially outer side it can happen that the liquid over the boundary edge (3b) of the outflow opening is not sufficiently discharged through the outflow opening (3) on the side facing the impeller (4), so that it is in the area the strongest before the start of the bevel or rounding (3 c) 20 compression, the so-called apex, becomes liquid; a narrow straight edge or bevel (3 ä) is congested in that the liquid ring runs up to. approaches the hub. This phenomenon leads to

a high power loss of the compressor in this operating range and a high Wellenbela- stung 35 which can even cause shaft breakage.

So while at a high pressure ratio a

The most unhindered, easy outflow of the excess operating fluid is advantageous, if one wishes at a lower pressure ratio, 30 that as little liquid as possible from the outflow opening flows out with the pumped gas, since the

The invention relates only relatively little to a liquid pump in this operating range ring compressor with at least one impeller, which is supplied with operating fluid and when it is too large sen vane cell spaces to a Ausströmöff- liquid loss through the outflow opening the the delivery medium and part of the delivery is impaired.

The control disk containing driving fluid is open. The object of the invention is to provide a

are, with the discharge opening on the side of the vane liquid ring compressor to create this wheel lies in the area of the wing. diametrically opposed demands

Liquid ring compressor or the individual stages.

A multi-stage liquid ring compressor 40. According to the invention, the solution was found therein hydraulically each for a certain conveying end that one is the radially outer boundary edge quantity and a certain pressure ratio from the outflow opening or openings on the lays. These delivery rates determine the side facing the impeller bevels or run-down dimensions of the conveying space - width and det.

Diameter of the impeller, number of blades, blade fore 45 Does the compressor convey with low pressure deflection, Diameter of the housing - for a long time and it only receives a little operating fluid if they also determine the size and shape of the duct, only a small number of operating fluid flow openings occurs for the pumped medium. In particular, the amount of gas produced from the impeller pressure ratio to be overcome by the stage cells through the outflow opening. The completed decisive for their design. 50 dete or beveled radially outer boundary

The compressor now not always only has the effect that the necessary operating fluid quantity in the delivery chamber of the pump must be retained in most applications. On the other hand, the run-down seems to be more or less large pressure areas covered at a high pressure ratio when the verren. This means that it has to work more densely, that is, a large amount of liquid, even in areas 55 for which it is not optimally designed, surprisingly leads to the opposite and in which it therefore does not have an optimal effect can cause cavitation phenomena to disappear. Apart from a reduction in the pumping capacity and a build-up of fluid in the apex, this occurs correspondingly easily, which must be attributed to a considerably less favorable performance behavior and the resultant output.
unfavorable efficiency noticeable. It has been found to be particularly beneficial

The pressure ratio of the compressor is correct if you look at the radially outer limit. the bend for the length of the throughflow openings of the outflow opening with bevel or rounding Medium in the circumferential direction. To with under- on the side facing the impeller before beginning With different pressure conditions, the slope or rounding should be as narrow and straight as possible To work economically, it is known to provide part of the edge or bevel. Since the impeller to the exhaust port side of the control disc to be covered with automatic valves or limitation mark, which the length of the outflow opening always has to be machined because between