DE1703763C3

DE1703763C3 - Screw pump

Info

Publication number: DE1703763C3
Application number: DE1703763A
Authority: DE
Inventors: Fritz 4272 Kirchhellen Seeberger
Original assignee: SEEBERGER KG MASCHINEN und GERAETEBAU 4272 KIRCHHELLEN
Current assignee: SEEBERGER KG MASCHINEN und GERAETEBAU 4272 KIRCHHELLEN
Priority date: 1968-07-06
Filing date: 1968-07-06
Publication date: 1975-10-16
Also published as: DE1703763B2; DE1703763A1

Description

rungsform wird man, wie auch in den Zeichnungen dargestellt, an beiden Enden der Kupplungsstange 4 ein Kardangelenk vorsehen. 1st dem gegenüber auch derAs shown in the drawings, Provide a universal joint at both ends of the coupling rod 4. Is also the opposite of that

ständen ein Kardangelenk ausreichend. Jedenfalls besitzen die Kardangelenke im Ausführungsbeispiel den Gelenkwinkel begrenzende Anschlagflächen 6, 7, soa universal joint would be sufficient. In any case, the cardan joints in the exemplary embodiment have the Joint angle limiting stop surfaces 6, 7, see above

bildeten Bohrung versehenen Wellenstumpf hält. Im übrigen kennt man für andere Zwecke Kardangelenke (GB-PS 121 685) bei denen auf die Enden der zu verbin-formed bore-provided shaft stub holds. In addition, cardan joints are known for other purposes (GB-PS 121 685) where the ends of the

Wellenstücke über orthogonal zueinander angeordnete, das jeweilige Wellenstück, den Ring und die Muffe durchsetzende Gelenkbolzen miteinander verbundenShaft pieces over orthogonally arranged, the respective shaft piece, the ring and the sleeve penetrating joint bolts connected to one another

Weise jeweils den Gelenkwinkel begrenzende Anschlagflächen. Die Ringe sind dazu vorgesehen, den ohne Ring auftretenden Verschleiß der Wellenstücke zu verhindern. Die Gestaltung von Exzenterschneckenpumpen der eingangs beschriebenen Gattung ist durch diese bekannten Maßnahmen bisher nicht beeinflußt worden.Way in each case the joint angle limiting stop surfaces. The rings are intended for the to prevent wear of the shaft pieces without a ring. The design of progressing cavity pumps the type described at the beginning has not yet been influenced by these known measures been.

Der Erfindung liegt die Aufgabe zugrunde, eine ExThe invention is based on the object of an Ex

zenterschneckenpumpe der eingangs beschriebenen 65 Das in den Innenring 9 eingeführte Teil ist auf einemcenter screw pump of the 65 described above. The part introduced into the inner ring 9 is on a

Gattung so weiterzuentwickeln, daß auch bei hohen Abgabedrücken die zumeist aus Gummi oder Kunststoff bestehende Manschette des Stators keinen nachdurchgehenden Gelenkbolzen 12 gelagert, der Innenring 9 besitzt an seiner Innenseite die Anschlagflächen C für das eingeführte Teil. Der Außenring 10 ist mitThe genus needs to be further developed in such a way that, even with high delivery pressures, it is mostly made of rubber or plastic The existing sleeve of the stator does not have a subsequent joint pin 12, the inner ring 9 has the stop surfaces C for the inserted part on its inside. The outer ring 10 is with

Hilfe von zwei zu dem vorgenannten Gelenkbolzen 12 senkrechten Gelenkzapfen 13 gelenkig an den Innenring 9 angeschlossen, wobei der Innern ^;ng 9 an seiner Außenseite die mit dem Außenrinp 10 wechselwirkenden Anschlagflächen 7 aufweist.With the aid of two hinge pins 13 perpendicular to the aforementioned hinge pin 12, articulated to the inner ring 9, the interior ^; 9 has the stop surfaces 7 interacting with the outer ring 10 on its outside.

2 Blatt Zeichnungen2 sheets of drawings

Claims

Claim:

Eccentric screw pump with rotor, stator, drive shaft and coupling rod between rotor and drive shaft and with at least one with Cardan joint fitted with a cuff, which has an inner ring with a continuous joint pin and a coupling rod stump mounted on it and inserted into the inner ring or stub shaft or stub rotor and one mounted with two pivot pins on the inner ring Has outer ring, wherein the two pivot pins are arranged perpendicular to the continuous pivot pin are, characterized in that the inner ring (9) both at its with the introduced Coupling rod stub or stub shaft or stub rotor as well as on his with then Outer ring (iö) interacting inner resp.

are exposed to partial loads.

The solution 'of this problem is that the inner ring both at its with the introduced Coupling stub or shaft stub or rotor stub as well as on its inner and outer side interacting with the outer ring, each with one the joint angle limiting stop surface to support based on the delivery pressure Buckling loads of the unit rotor-coupling rod-drive shaft is provided.

The advantages achieved can be seen in the fact that the eccentric screw pump according to the invention Even with high delivery pressures, the cuff no longer has to withstand adverse stresses, because the joint angle is limited. You can therefore easily made of conventional rubber or plastic materials getting produced.

In the following the invention is based on a drawing showing only one embodiment

Tensioning of buckling loads on the unit rotor (1) - coupling rod due to the discharge pressure (4) - Drive shaft (3) is provided.

The invention relates to an eccentric screw pump with rotor, stator, drive shaft and clutch

Outside, each with a joint angle opening explained in more detail. It shows
bordering stop surface (6 or 7) for support F i g. 1 shows an axial section through a erfindungsge

proper eccentric screw pump,

F i g. 2 in an enlarged section A from the object according to FIG. 1,

F i g. 3 shows a section in the direction BB through the object according to FIG. 2

The basic structure of the eccentric screw pump shown in the figures consists of the rotor 1, the stator 2 and the drive shaft 3

rod between rotor and drive shaft as well as to- 30 and a coupling rod 4 equipped with at least one cardan joint with at least one cuff fitted between rotor 1 and ancillary cardan joint, which has an inner ring with a continuous joint pin and is mounted on it
Inner ring inserted coupling rod stub or

Shaft stub or rotor stub and one with two 35 made of rubber or plastic, in the stator pivot pin sleeve attached to the outer ring housing mounted on the inner ring 2. Be [this version has wherein the two pivot pins are arranged perpendicular to the continuous pivot pin.

In (from practice) known eccentric screw pumps of the type described, in particular the stator 2 or the cuff described in the Gedere at high delivery pressures, which mostly consist of rubber housing 1, is articulated, so is an existing cuff under ummi or plastic disadvantageous
Rolling loads because the joint angle of the
Cardan joint can become too big. This applies in particular to a known forerunner (DT-AS 45 that on these stop surfaces 6, 7 on the delivery 1 278 842) in which a pin exerts buckling loads on the unit based on a convex expression

from rotor 1, coupling rod 4 and drive shaft 3 are supported. In fact, the delivery pressure is acting the rotor 1 in the direction of arrow 8, whereby without

The end of the shaft pieces each have one of a common another, the buckling loads described The sleeve covered ring is attached and which could occur. You would extend the life of the

Considerably reduce stator 2 when working with universal joints of the usual embodiment. Would you be pin joints with only one freedom. If the rings are placed on the 55 degrees facing the socket, these hinge pins would be in to the side rounded cross-section and have stressed in this part way on shear and prematurely

are destroyed, while also the stator 2 is affected. Are in accordance with the invention the stop parts 6.7 chosen so that adverse stresses occur neither in the stator 2 nor on the joint parts. This can be achieved by the universal joint has an inner ring 9 with the coupling rod stub 4 or stub shaft inserted therein or has a stub rotor and an outer ring 10.

drive shaft 3. The drive shaft 3 is connected to a drive motor. The stator 2 is seen in Embodiment from one in the stator housing 5 and