DE1278842C2

DE1278842C2 - SCREW PUMP

Info

Publication number: DE1278842C2
Application number: DE19591278842
Authority: DE
Priority date: 1959-05-25
Filing date: 1959-05-25
Publication date: 1973-09-20
Also published as: DE1278842B

Description

einem längeren rohrförmigen Teil größeren Durchmessers über die rohrförmige Verlängerung des Rotors gezogen und dort mittels eines Endwulstes festgehalten ista longer tubular part of larger diameter via the tubular extension of the Rotor is drawn and held there by means of an end bead

Die durch die Erfindung erreichten Vorteils sind vor allem darin zu sehen, daß durch besondere und dabei einfache Ausbildung und Anordnung der Schutzmuffe ein sicherer Schutz des kardanartigen Gelenkes erreicht wird. Bei der einseitig klemmenden Befestigung der Schutzmuffe und die erfolgte « Anordnung des Endwulstes an der anderen .Seite derselben wird die so um das kardanische Gelenk gebildete Kapselung auf einfache Weise dicht gehalten. Die z. B. aus Gummi bestehende Schutzmuffe selbst zeichnet sich durch große Lebensdauer aus, da in der Schutzmuffe Walkbeanspruchungen infolge der nur einseitigen klemmenden Befestigung ausgeglichen werden können. Zudem erlaubt es die erfindungsgemäße Ausbildung auf Grund der Anordnung des Endwulstes dem in der so gebildeten Schmiermittel- ao kammer eingeführten Schmiermittel über eine an sich bekannte Kolbenanordnung dem Schmiermittel einen Druck zu erteilen, der das Eindringen eines Fördermediums in das Innere der Schutzmuffe praktisch vollkommen ausschließt Es wird somit mit einfach- »3 sten Mitteln eine wesentliche Erhöhung der Lebensdauer des zwischen Antriebswelle und Rotor notwendig vorhandenen kardanartigen Gelenkes erreicht.The advantages achieved by the invention are mainly to be seen in the fact that by special and while simple design and arrangement of the protective sleeve a reliable protection of the cardan-type Joint is achieved. With the one-sided clamping of the protective sleeve and the « Arrangement of the end bead on the other .Seite same is the so formed around the cardanic joint Encapsulation kept tight in a simple manner. The z. B. made of rubber protective sleeve itself is characterized by a long service life, as there are flexing loads in the protective sleeve as a result of the only one-sided clamping fastening can be compensated. It also allows the inventive Training due to the arrangement of the end bead in the lubricant ao formed in this way Chamber introduced lubricant via a piston assembly known per se to the lubricant To give pressure that the penetration of a pumped medium into the interior of the protective sleeve is practical completely excludes It is thus with simple- »3 Most means a substantial increase in the service life of the between the drive shaft and rotor is necessary existing cardan-like joint reached.

Im folgenden wird die Erfindung an Hand einer lediglich ein Ausfuhrungsbeispiel darstellenden Zeichnung ausführlich erläutert; es zeigtIn the following, the invention is illustrated by means of a drawing that shows only one exemplary embodiment explained in detail; it shows

Fig. 1 in einem Axialschnitt eine erfindungsgemäße Schneckenpumpe,1 shows a screw pump according to the invention in an axial section,

Fig. 2 einen vergrößerten Ausschnitt nach dem Gegenstand aus Fig. 1.FIG. 2 shows an enlarged section according to the object from FIG. 1.

Die in den Figuren dargestellte Schneckenpumpe besteht in ihrem grundsätzlichen Aufbau aus dem Rotor 1, der aus Stahl in Form einer eingängigen Schnecke ausgeführt ist und dem Stator 2, der als zweigängige Hohlschnecke ausgeführt und aus elastisctiem Material, nämlich Naturgummi oder synthetischem Gummi, besteht. Rotor 1 und Stator 2 arbeiten dabei so zusammen, daß ein stetiger dichter Abschluß erzielt wird, der bei der Rotation sich entlang des Stators 2 verschiebt wodurch eine gleichmäßige und stets positive Pumpwirkung erreicht wird. Der Antrieb des Rotors 1 erfolgt über das Antnebswellenstück 3 das einerseits in einem besonderen Futter 4 im Pumpengehäuse 5, andererseits in Kugellagern 6 des Gestells 7 gelagert ist. Auf das Antriebswellenstück 3 arbeitet der nicht gezeichnete Antriebsmotor. Im übrigen mündet in das Pumpengehäuse 5 der Saugstutzen 8 ein, während der Druckstutzen 9 hinter dem Rotor 1 an das Pumpengehäuse 5 angeschlossen ist Die einzelnen Gehäuseteile sind mittels Schraubenbolzen 10 miteinander verbunden, was im einzelnen nicht der Beschreibung bedarf.The basic structure of the screw pump shown in the figures consists of the Rotor 1, which is made of steel in the form of a single-flight worm and the stator 2, which is as double-flighted hollow screw made and made of elastic Material, namely natural rubber or synthetic rubber, is made. Rotor 1 and stator 2 are working at the same time together in such a way that a steady, tight seal is achieved, which runs along with the rotation of the stator 2 moves whereby a uniform and always positive pumping effect is achieved. the The rotor 1 is driven via the drive shaft piece 3, which is on the one hand in a special chuck 4 is mounted in the pump housing 5, on the other hand in ball bearings 6 of the frame 7. On the drive shaft piece 3 the drive motor, not shown, works. Otherwise opens into the pump housing 5 of the Suction nozzle 8, while the pressure nozzle 9 is connected to the pump housing 5 behind the rotor 1 The individual housing parts are connected to one another by means of screw bolts 10, which is in the individual does not need to be described.

Wesentlich ist das zwischen Antriebswelle 3 und Rotor 1 befindliche Gelenk 11. Wie die vergrößerte Darstellung nach Fig. 2 zeigt besteht das kardanartige Gelenk 11 aus einem Gelenkbolzen 11 α sowie einem Bolzenlager 11 b, welches ballig ausgebildet ist Das Gelenk ist von ftiaer Schutzmuffe 12 umgeben, die das Gelenk 11 kapselt. Die Schutzmuffe 12 weist einerseits einen Endwulst 12 a auf, der in eine entsprechende Rille einer das Gelenk umgebenden, zum Antriebswellenstück hin offenen rohrförmigen Verlängerung 1 α des Rotors 1 eingesetzt ist und dort die Schutzmuffe 12 festhält, während an der anderen Seite die Schutzmuffe 12 mit einem rohrförmigen Teil 12 c kleineren Durchmessers mit einem Klemmring 13 an das Antriebswellenende 3 unmittelbar angeschlossen ist. Der mit dem Endwulst 12 a versehene längere Teil Ub besitzt einen größeren Durchmesser.Essentially this is joint 11. As is located between drive shaft 3 and rotor 1 shows the enlarged representation of FIG. 2, the cardan joint 11 α of a hinge pin 11 and a pin bearing 11b, which is formed spherically The joint is surrounded by ftiaer protective sleeve 12 that encapsulates the joint 11. The protective sleeve 12 has, on the one hand, an end bead 12 a, which is inserted into a corresponding groove of a tubular extension 1 α of the rotor 1 that surrounds the joint and is open towards the drive shaft piece and holds the protective sleeve 12 there, while the protective sleeve 12 on the other side a tubular part 12 c of smaller diameter with a clamping ring 13 is directly connected to the drive shaft end 3. The longer part Ub provided with the end bead 12 a has a larger diameter.

Der Rotor 1 ist mit einer Bohrung 1 b versehen, die als Schmiennittelreservoir ausgebildet ist und zu diesem Zweck einen federbelasteten Kolben 1 c aufweist, der das Schmiermittel in der Bohrung 1 b unter Druck hält. Die Bohrung 1 b ist an das kardanartige Gelenk 11 angeschlossen, so daß die beschriebene Schutzmuffe 12 eine Fettkammer bildet und das Gelenk folglich in einem Schmiermittel, beispielsweise in Öl oder in Fett, läuft.The rotor 1 is provided with a bore 1 b, which is formed as Schmiennittelreservoir c and having for this purpose a spring-loaded piston 1 b, the lubricant in the bore 1 holds under pressure. The bore 1 b is connected to the cardan-like joint 11, so that the protective sleeve 12 described forms a grease chamber and the joint consequently runs in a lubricant, for example in oil or in grease.

1 sheet of drawings

Claims

Claim:

Worm pump with a metallic rotor, preferably designed as a single-flight screw, and an elastic stator, formed as a multi-flight hollow screw, as well as a cardan-like joint between the rotor and an adjoining drive shaft section, located in the material flow and encapsulated by a protective sleeve made of elastic material, characterized in that the rotor ( 1) has a tubular extension (la) that surrounds the joint and is open towards the drive shaft section (3) and that the protective sleeve (12) is attached on the one hand to a tubular part (12 c) of smaller diameter on the drive shaft section (3) and on the other hand with a longer tubular part (126) of larger diameter is drawn over the tubular extension _Μ (Ια) of the rotor and is held there by means of an end bead (12 a).

95

Screw pumps are known in a wide variety of designs. They consist in the The main thing is a rotor, which is preferably designed as a single-flight screw, and an elastic one designed as a multi-flight worm stator. The screw pumps are suitable because of the Robust design especially for pumping liquid media that contain a significant proportion of solids have, as this z. B. in the discharge of the sludge water from furnace gas nafireinigungsanlagen the case is. The media to be conveyed therefore often have a considerable corrosive behavior, what the life of the screw pumps and especially the life of the connection between The rotor and motor shaft are affected as these parts are affected by the practically unavoidable eccentric movement of the rotor with respect to the motor shaft and the associated relative movement between these parts, which are mostly in the medium to be conveyed, are exposed to corrosive attack.

In a known embodiment, the rotor is therefore interposed with the drive shaft an elastic rubber block coupled together, the rest of the rotor being hollow is trained. Such a measure increases the service life, but hinders the relative displacement between the rotor and the drive shaft, so that the efficiency drops The embodiment is the rotor via a pressure screw against a rubber ring in a recess of the flange of the motor shaft. The rotor is driven by a driver piece, which is fitted into recesses in the motor shaft and the rotor. It is true for the rubber ring a certain amount of play is provided within the recesses of the motor shaft, but there is ongoing play Readjustment of the pressure screw is necessary and has due to the stresses that occur the rubber ring only has a short service life. The sealing effect achieved by means of the rubber ring is also not satisfying. Another disadvantage of the embodiments a described above is that the Coupling elements between motor and rotor only allow the transmission of low torques In order to remedy this disadvantage, therefore, mostly used in the known execution forms a cardan-type one arranged between the rotor and a drive shaft piece to be connected Joint, which is located in the crop flow To protect this essentially from corrosive attacks, it has become known to encapsulate the same by means of a protective sleeve made of elastic material. A removal the lubricant for the cardan-like joint is largely avoided. The structure the protective sleeves and the parts associated with them is complicated, or in other embodiments, the eccentric movements do not achieve the desired sealing effect. In particular, the flexing stresses that the well-known Protective sleeves are subject to rapid destruction of the same.

Furthermore, screw pumps are known whose rotor is hollow. In such an embodiment the rotor is open on the suction side and connected to the pressure chamber via bores on the pressure side, so that it serves as a bypass. According to a further known embodiment is on the housing a jacket surrounding the rotor rigidly attached and lead from the hollow interior of the Rotor bores to the outer surface, so that the jacket through an inserted into the hollow rotor Pressure medium can be lifted off and the friction between the rotor and the jacket is reduced. at Another known embodiment, the drive shaft is mounted and centrally in the hollow rotor on the one hand secured against the ingress of the medium to be conveyed by means of a leather sleeve, while on the other side the hollow rotor is designed as a lubricant chamber, whereby the Lubricant is pressurized by means of a piston working against a spring. Such a one However, the embodiment is disadvantageous because the eccentric movements are made by means of the leather sleeve of the rotor the required seal is not guaranteed and thus after a short time Time a leak cannot be avoided, with the lubricant escaping and from the pumped medium is removed.

The invention relates in particular to a screw pump with a metallic, preferably a single-start Screw designed rotor and an elastic, designed as a multi-flight hollow screw Stator as well as one lying in the material flow, from a dirt sleeve made of elastic material encapsulated cardan-type joint between the rotor and an adjoining drive shaft piece.

The invention has set itself the task of providing a screw pump of this type in the simplest possible way to train that a reliable protection of this joint against corrosive attacks is achievable and the The service life of such a worm pump is thus significantly increased.

The invention consists in that the rotor has a joint surrounding the drive shaft piece has open tubular extension and that the protective sleeve on the one hand with a tubular Part of the smaller diameter is attached to the same on the drive shaft piece and on the other hand with