EP3538767A1

EP3538767A1 - Eccentric screw pump

Info

Publication number: EP3538767A1
Application number: EP17804474.9A
Authority: EP
Inventors: Dirk Overmeier; Peter McGarian; Norman Dicks; Vsevolod Ryvkin; Marcel Griesdorn; Stefan Goethel
Original assignee: Seepex GmbH
Current assignee: Seepex GmbH
Priority date: 2016-11-10
Filing date: 2017-11-09
Publication date: 2019-09-18
Anticipated expiration: 2037-11-09
Also published as: CN109952436B; CN109952436A; WO2018087248A1; US11378078B2; EP3538767B1; US20190316583A1; DE102016121582A1

Abstract

What is concerned is an eccentric screw pump having at least one stator (1), a rotor (2) rotating in the stator, a drive (3) for the rotor, a pump housing (4) which is connected to the stator (1) and has at least one inlet opening (6) for the medium to be conveyed, a connection housing (14) arranged between the pump housing (4) and drive (3), a connection shaft (9) which is connected to the drive (3) and is arranged at least in certain regions in the connection housing (14), and a coupling rod (10) which is arranged in the pump housing (4) and is connected to the connection shaft (9) via a drive-side joint (11) and to the rotor (2) via a rotor-side joint (12). The drive-side housing connection piece (16) can be demounted in such a way that the drive-side joint (11) can be exposed for maintenance or demounting.

Description

Cavity Pump

Description:

The invention relates to an eccentric screw pump with at least

a stator,

a rotor rotating in the stator,

a drive for the rotor,

a pump housing (eg suction housing) connected to the stator (eg on the suction side), which has at least one housing opening, eg a housing, for example, B. inlet opening (or outlet opening), for the medium to be delivered,

a connection housing arranged between the pump housing and the drive,

- A connecting shaft connected to the drive, which is arranged at least partially in the connecting housing and

- One arranged in the pump housing coupling rod, which is connected via a drive-side joint with the connecting shaft and a rotor-side joint with the rotor, wherein the pump housing has a drive-side (eg tubular) housing stub to which the connection housing is connected the pump housing has a stator-side (eg tubular) housing stub to which the stator is connected. The housing opening, z. B. inlet opening of the pump housing (which can also work as an outlet) is preferably disposed between the drive-side nozzle and the stator-side nozzle.

Such an eccentric screw pump is a pump from the group of rotary displacement pumps, which are used to convey a wide variety of media and in particular highly viscous liquids in various industrial sectors. The liquids to be delivered can be z. B. also contain solids.

The stator consists z. B. of elastic or elastomeric material and is usually surrounded by a one-piece or multi-part stator shell or stator housing. Alternatively, but also stators made of other material, eg. B. detected from metal. The suction side connected to the stator pump housing is generally referred to as a suction housing and the pressure side connected to the stator housing z. B. as a discharge nozzle. In principle, however, it is also possible to operate such a pump in the opposite direction of conveyance, so that the suction housing (as pump housing) would then be arranged on the pressure side. The name of the pump housing or suction housing is thus carried out in the context of the invention, regardless of the actual conveying direction. The rotating and at the same time the eccentricity ensuring connection between the drive or the connecting shaft on the one hand and the rotor on the other hand via the arranged in the pump housing coupling rod. The drive works on the coupling rod via the connecting shaft. In this case, the connecting shaft can be formed directly from the drive shaft of the drive. However, the connecting shaft is preferably a shaft that is separate from the drive and that can be designed as a plug-in shaft and, as it were, serves as a connecting piece between the drive shaft and the power transmission parts of the pump. The connection housing arranged between the pump housing (eg suction housing) and the drive is also referred to in practice as a "lantern." This serves to "receive" or fasten and support the pump housing on the one hand and the drive on the other hand.

so that this connection housing or the lantern is mounted on a base plate or directly on a foundation and the drive and the pump housing is supported or carries. The drive can be designed as an electric motor drive or as a hydraulic drive.

Preferably, the eccentric screw pump is designed as a funnel pump, wherein the inlet opening of the pump housing is designed as an inlet funnel. Preferably, the coupling rod z. B. is arranged below the inlet funnel, with at least one transport device, for. B. a transport screw or similar transport elements. Such a screw conveyor can, for. B. peripherally circumferentially welded to the coupling rod.

The maintenance and repair of a pump is in practice of particular importance, especially since various parts are subject to a possibly significant wear and therefore, if necessary, replaced and replaced as wearing parts. Thus, in particular the replacement of the stator and optionally the rotor is of particular importance. Since the rotor is usually connected via a rotor-side joint with the coupling rod, a disassembly of this joint is usually required in the course of an exchange, so that the accessibility of the rotor-side joint is of particular importance.

Against this background, WO 2010/012993 A2 has already described the possibility of exposing the region of the rotor-side joint of the coupling rod by making the stator-side or rotor-side housing neck of the pump housing removable. For this purpose, a nozzle section of this housing neck of the pump housing

releasably and in the axial or axis-parallel direction slidable on the stator, so that the rotor-side portion of the coupling rod is exposed.

Based on the known prior art, the present invention seeks to provide an eccentric screw pump of the type described above, which is characterized by a simple structure by optimized maintenance and repair options.

To solve this problem, the invention teaches in a generic eccentric screw pump of the type described above, that the antnebsseitige housing stub so dismantled (or disassembled) and therefore open, that the anti-sideways joint for maintenance or disassembly is exposed. The antinodial housing stub is preferably designed so that the antinode-side joint can be exposed such that the (at least in the joint region or in the plane of the joint) is no longer surrounded over the entire circumference of the housing stub by the drive-side housing stub. Preferably, the exposure of the drive-side joint takes place in such a way that the antisense joint (in the joint area) is fully exposed.

The invention is based on the recognition that can be optimized maintenance and repair options of an eccentric screw pump of the type described, if the possibility of a (simple) disassembly or disassembly of the pump housing on the drive side is made possible in which the antnebsseitige housing neck, the z , B. may be configured tubular, and in the z. B. the counterpart-side joint is arranged, disassembled or dismantled configured. The measures known from the prior art, which relate to the stator-side region, are transferred according to the invention to the drive-side region.

According to the invention, it is then possible to expose the drive-side joint by appropriate disassembly in the region of the drive-side housing neck of the pump housing, so that the drive-side joint then z. B. can be decomposed. In this way, the coupling rod can be separated from the drive shaft or cardan shaft, so that in particular an exchange of the shaft seal (eg mechanical seal) and / or the drive shaft (eg stub shaft) is possible, without that Pump housing or the drive would have to be dismantled altogether. Rather, a locally very limited disassembly or opening of the pump housing in the region of the drive-side housing stub of the pump housing is sufficient. It is within the scope of the invention that the disassembly of the drive-side housing neck or the exposure of the joint takes place such that the drive-side joint is no longer surrounded over the entire circumference of the housing neck of the drive-side housing neck.

This can be z. B. realize that the drive-side housing stub is at least partially formed by a plurality of half-shells or partial shells, z. B. from an upper half shell and a lower half shell, so that then z. B. one of the half shells can be removed to expose the drive-side joint. If only one of the half shells removed, the drive-side joint is then no longer wrapped over the entire circumference after the removal of this half-shell, but z. B. only over half of the circumference of the drive-side housing stub. However, it is particularly preferably provided that the exposure of the joint takes place in such a way that the drive-side joint (in the joint region) is fully exposed. This can be z. B. realize that an upper half-shell and a lower half-shell are removed, so that the joint is completely exposed and is no longer wrapped. Especially

Preferably, the exposure of the drive-side joint is effected by a displacement of a nozzle section in the axial or paraxial direction. For this purpose, the drive-side housing stub can on the one hand have a (locally) fixed stub section and, on the other hand, a second (tubular) stub section, which is axially displaceable relative to the first stub section, and particularly preferably can be pushed axially in the direction of the inlet opening onto the first stub section. There is the possibility that the second nozzle section can be pushed onto the first nozzle section. Alternatively it can be provided that the second nozzle section can be inserted into the first nozzle section. The invention basically includes the possibility that such a displaceable housing or such a displaceable (tubular) nozzle section is pushed away from the pump housing and consequently in the direction of the drive or of the connection housing (lantern). However, the displacement preferably takes place in the direction of the pump housing (or on the pump housing).

According to a further proposal of the invention is optionally provided that the connection housing (which is also referred to as a lantern), about a vertical axis of rotation relative to the base plane of the pump is pivotable. This means that, when the pump housing is mounted in a stationary manner and only the drive housing spigot removed or opened, it is possible to rotate the connection housing and consequently the lantern on the ground plane of the pump. These measures allow a particularly simple disassembly of the drive shaft or the stub shaft, which is arranged within the connection housing. Because by a rotation about a vertical axis (based on the ground plane of the pump), the interior of the connection housing is laterally accessible, so that the connecting shaft (stub shaft) pulled out of the connection housing

without disassembly (i.e., removal) of the connector housing. Rather, it is sufficient to first open the drive-side housing spigot in the manner according to the invention or to dismantle and then the rotation of the connection housing can take place. Such a "pivotable" lantern is therefore optionally of particular importance in the context of the invention.

According to a further proposal of the invention, it is optionally provided that the drive-side housing stub (on the one hand) has a (locally) fixed first stub section and (on the other hand) a second stub section, wherein the second stub section extends axially in the direction of the inlet opening onto the first stub section slidable. This possibility relates - as already described - the drive-side housing socket, so that the drive-side joint exposable and z. B. then the lantern is pivoted.

It is preferably provided that the (tubular) second nozzle portion and the (tubular) first nozzle portion are each at least partially cylindrical or substantially cylindrical. It is advantageous if the inner diameter of the displaceable second nozzle portion (at least partially) is greater than the outer diameter of the fixed first nozzle portion. This applies in particular when the second nozzle section can be pushed onto the first nozzle section. If the second nozzle section can be inserted into the first nozzle section, it is expedient for the outer diameter of the second nozzle section to be smaller than the inner diameter of the first nozzle section. In the assembled state, of course, a suitable seal between the first nozzle portion and the second nozzle portion is provided, so that the

Pump housing is designed to be liquid-tight and pressure-tight. For this purpose, the fixed first nozzle section outside circumference with a circumferential seal, z. As an O-ring, be provided. Alternatively or additionally, the displaceable second nozzle section on the inner peripheral side with a circumferential seal, for. As an O-ring, be provided. It is understood that the respective opposite part optionally has corresponding sealing surfaces against which the seal rests. If the second nozzle section is inserted into the first nozzle section, it is expedient that the first nozzle section on the inner circumferential side with a peripheral seal, for. B. an O-ring is provided or that alternatively the displaceable second nozzle section outside circumference with a peripheral seal, for. B. an O-ring is provided. According to a further proposal of the invention it is provided that the coupling rod, which optionally with a transport device, for. B. transport screw is provided in the course of disassembly of the drive-side housing stub against lowering or falling and / or against (axial) displacement is supported or supported. This makes it possible to fix the coupling rod (or screw conveyor) before loosening the drive-side joint for service purposes. In this way, the dismantling of the joints can be facilitated. A separate fixation and positioning by a crane or the like is not necessary. Because it should be noted that the coupling rod, in particular in the embodiment with auger in practice may have a high weight. This also reduces the risk of injury when working on the joint. Moreover, can be achieved on such a support or fixation at the same time a seal of the suction chamber, so that z. B. the

Space around the joint can be cleaned without liquid entering the pump housing. This will be discussed below.

In one embodiment it is provided that the coupling rod of the displaceable second nozzle portion, for. B. is supported by a front-side nozzle wall of the second nozzle portion. The displaceable second nozzle section can therefore be equipped at the end with a front-side nozzle wall, which preferably has a (central) opening. In the assembled state z. B. the connecting shaft to pass through this breakthrough. In the course of disassembly of the second nozzle portion is moved toward the first nozzle portion, z. B. pushed onto this or inserted into this. The dimensions are realized such that the coupling rod engages in the inserted state of the second nozzle portion in the opening of the nozzle wall, that this nozzle wall or the aperture fix the coupling rod against lowering and / or against axial displacement or supported. The aperture can be adapted to the outer circumference of the coupling rod in such a way that in the inserted state, a seal is made, via the front-side nozzle wall of the displaceable second nozzle portion.

In a modified embodiment, the support of the coupling rod during disassembly is realized by a arranged in the drive-side housing spigot partition. Such a partition may separate a drive side chamber (formed, for example, by the slidable spigot section) from the interior of the pump housing. This partition may have an opening through which the coupling rod is passed, so that z. B. the coupling rod - at least in the course of disassembly of the drive-side housing stub - in the

Breakthrough is supported. In this way, consequently, with the help of the partition wall, the space around the drive-side joint can be separated from the interior of the pump housing (eg the suction space) for cleaning purposes. Also in this embodiment, there is the possibility that at the same time a sealing of the coupling rod is realized in the opening to realize in this way a seal of the drive-side chamber relative to the interior of the pump housing. For this purpose, the coupling rod can be supported with the interposition of a seal in the opening. Consequently, a sealing element can be integrated in the opening of the partition.

A partition in the drive-side housing neck, which z. B. separates a drive-side chamber from the interior of the pump housing, may also be advantageous regardless of the problem of supporting the coupling rod, so that this aspect of the partition described also independent of a support of the coupling rod or without the possibility of supporting the Coupling rod is placed under protection. In particular, such a partition wall also impedes the penetration of pumped medium into the separated (drive-side) area, ie. H. a passage of fluid from the pump housing into the separated, drive-side chamber is difficult.

Optionally, it is also provided that the second nozzle section, z. B. the drive-side chamber, is provided with one or more flushing connections, so that this drive-side chamber, in which in the course of disassembly is the exposed joint can be flushed for cleaning purposes, without the flushing liquid enters the suction chamber. Also in connection with such flushing, the use of the partition described can therefore be advantageous, since with the help of the partition still

can better prevent any residues of a pumped liquid block or complicate the displacement of the housing part.

A support of the coupling rod in the course of dismantling is not only possible in embodiments with movable second nozzle sections, but also in other housing designs with exposure of the joint area, z. B. also in solutions with one or more half-shells, which form the drive-side housing stub or are connected to the drive-side housing stub. Thus, there is the possibility that the drive-side housing socket has a first, fixed nozzle portion, to which a laying second nozzle portion is connected, which z. B. has one or more removable part shells, z. B. is formed by two half-shells. In such an embodiment, for. B. may be arranged in the fixed, first nozzle portion and this in turn may be provided with an opening through which the coupling rod is passed, so that the coupling rod is supported during disassembly in this opening. In the manner already described, a seal may also be provided in the region of this opening.

Incidentally, it is also possible in principle to mount separate holding components for supporting the coupling rod in the course of assembly. In any case, a support or fixation of the coupling rod or screw conveyor preferably takes place in that the drive-side end of the coupling rod or screw conveyor cooperates with a corresponding counterpart (eg the opening in the dividing wall), so that displacement (in the axial direction) and / or a decrease in the coupling rod (and thus the entire rotating unit) is prevented. This counterpart can in the manner described in a sliding member or a partition

be integrated or it is an additional component which can be fixed after disassembly or displacement of the covering components. Incidentally, this connection between the coupling rod and the corresponding counterpart can be used in the manner described in order to seal the gap between the coupling rod and the housing.

The already mentioned connection housing is mounted in a basically known manner on a base plate or a foundation, so that it supports or carries the drive and the pump housing. It is preferably provided that this attachment to the base plate or on the foundation for pivoting the connection housing is releasable. For this purpose, there is also the possibility that the connection housing is fastened with a plurality of screw connections (or similar connections) on the base plate and the foundation and that only a part of these connections is removed, so that subsequently a pivoting about an axis of rotation can take place, which of one of (dissolved) screw is formed. Decisive here is the fact that such a pivoting is possible according to the invention without the pump housing being completely removed. Rather, it is sufficient to disassemble or disassemble the pump housing in the region of the drive-side housing neck in the manner described by z. B. the second nozzle portion of the drive-side housing stub is moved.

In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. Show it

1 shows an eccentric screw pump according to the invention in one

Vertical section

2 to 7 a detail of the article according to FIG. 1 in different disassembly positions (FIGS. 2 to 5 side view / partial section, FIGS. 6 and 7 top view / partial section), FIG. 8 a second embodiment of the invention in one

Functional position corresponding to FIG. 3,

Fig. 9 shows a third embodiment of the invention (in a

Functional position according to FIG. 2),

10 shows a fourth embodiment of the invention,

Fig. 1 1 shows a fifth embodiment of the invention and Fig. 12 shows a sixth embodiment of the invention.

In the figures, an eccentric screw pump is shown, which has in its basic structure a stator 1, a rotor 2 rotating in the stator 1 and a drive 3 for the rotor 2. For example, on the suction side of the stator 1, a pump housing 4 is connected, which is referred to as a suction housing 4. A pressure side connected to the stator housing part (connection piece) is z. B. referred to as discharge nozzle 5. The pump housing 4 has a housing opening, for. B. inlet opening 6, via which the medium to be delivered is supplied, which is conveyed from the pump housing 4 via the stator / rotor to the discharge nozzle 5. The drive 3 is equipped with an integrated drive shaft, not shown, which is connected to a connecting shaft 9. This connecting shaft 9 is formed in the embodiment as a plug-in shaft. The rotor 2 is connected via a coupling rod 10 with the connecting shaft 9,

wherein the coupling rod 10 is connected via a drive-side joint 1 1 with the connecting shaft 9 and a rotor-side joint 12 with the rotor 2. For liquid-tight separation of the pump housing 4 against the environment or against the drive, the connecting shaft 9 is sealed with a shaft seal 13. This shaft seal 13 is z. B. formed as a mechanical seal. Details are not shown in the figures.

Between the pump housing 4 and the drive 3, a connection housing 14 is arranged, which is also referred to as a lantern. Such a connecting housing 14 receives on the one hand the pump housing 4 and on the other hand the drive 3 or supports it. In this respect, the connection housing 14 may be fastened to a base plate 15. The shaft seal 13 is connected to this connection housing 14. In the embodiment shown in FIGS. 1 to 7, the eccentric screw pump is designed as a funnel pump. The inlet opening 6 is formed as a funnel. The coupling rod 10 is provided with a screw conveyor 20, the z. B. outer peripheral side circumferentially welded to the coupling rod 10.

The pump housing 4 has a drive-side rohrformigen housing socket 16, to which the connecting housing 14 is connected, wherein in this drive-side housing socket 16, the drive-side hinge 1 1 is arranged.

In addition, the pump housing 4 has a stator (rohrformigen) housing stub 17, to which the stator 1 is connected, wherein in this stator-side housing stub 17 z. B. the stator-side joint or rotor-side joint 12 is arranged. In FIGS. 2 to 7, only the

Antnebsseitige housing socket 16 shown. The stator-side housing stub 17 is not shown in Figs. 2 to 7.

According to the invention, the counter-side housing stub 16 can be dismantled or dismounted in such a way that the counter-side articulation 11 can be uncovered for the purpose of maintenance and / or disassembly. This is apparent from a comparative consideration of FIGS. 2 to 7 and in particular FIGS. 2 and 3. It can be seen in the figures that in this embodiment by disassembly of the drive-side housing stub 16, the anti-sideways hinge 1 1 is fully exposed, d. H. the joint is in this area completely no longer surrounded by the housing neck 16. The exposure can take place over the entire length of the joint, but at least in the joint region or in the plane of the joint. In this case, the counterpart housing connection piece 16 consists of a first, fixed connection section 16a and a second displaceable connection section 16b. The second nozzle portion 16b is axially displaceable in the illustrated embodiment. A comparative examination of FIGS. 2 and 3 shows that the area of the drive-side joint 1 1 is exposed and consequently accessible due to the axial displacement of the second nozzle section 16 b. In the illustrated embodiment, a displacement of the second nozzle section 16b takes place axially in the direction of the first nozzle section 16a and consequently in the direction of the inlet opening 6 or the funnel of the pump housing 4.

It can be seen that between the first nozzle portion 16a and the second nozzle portion 16b at least one seal 18 is provided which seals the first nozzle portion 16a against the second nozzle portion 16b liquid-tight and pressure-tight, in the assembled state,

which is shown in Fig. 2. In the embodiment, the seal 18 is attached to the first nozzle portion 16a on the outer peripheral side (eg, in a groove). Alternatively, however, such a seal may also be arranged on the inner circumference of the second nozzle section 16b.

In any case, according to this first aspect of the invention, the drive-side joint is exposed for the purpose of maintenance and / or disassembly.

After the second nozzle section 16b has been pushed onto the first nozzle section 16a (FIG. 3), the collar 19 of the drive-side joint 11 can then be removed and the joint can be disassembled (compare FIG. Subsequently, the coupling rod 10 (together with the rotor 2 connected thereto) can be moved away or pulled away from the drive side (compare FIG. 5).

In a particularly advantageous development, according to FIG. 6, it is now possible to pivot the connecting housing 14 about a vertical axis of rotation A (see FIG. 6), without the pump housing 4 itself having to be removed. For by the pushing back of the second nozzle portion 16b corresponding free space is created to pivot the connection housing 14 in the manner shown. The specification of the vertical axis A refers to the base plate 15 or a corresponding foundation. In principle, however, it is also possible to mount such a pump in a different orientation. For example As an assembly in the vertical direction, the base plate is vertically aligned, so that the connection housing 14 is then pivoted about a horizontal axis, which, however, is then also vertically on the base plate and the corresponding reference plane.

According to FIG. 7, after the pivoting, the connecting shaft 9, which is designed as a plug-in shaft, can be pulled out of the connecting housing 14. This is interesting because it is possibly the plug-in shaft is a wearing part, which must be replaced at regular intervals. According to the invention, this replacement can now take place without the drive 3 and the pump housing 4 having to be removed. Rather, it is sufficient to open the pump housing 4 only on the drive side in the manner described or disassemble and then to pivot the connection housing 14 in the manner described. Alternatively or additionally, the shaft seal, z. B. Gleitringdrichtung 13 are exchanged.

6 and 7 show the pump in a plan view, while Figs. 2 to 5 show the pump in a side view and in a vertical section. It can be seen in FIGS. 6 and 7 that the lantern or the connecting housing 14 with fastening means, for. B. can be attached to the base plate with four screws. For pivoting now three of these screws can be removed and the remaining screw can be solved or loosened accordingly, so that the connection housing 14 is then pivotable about the axis A formed by this screw. In this respect, can be used in the attachment of the lantern 14 to basically known from the prior art concepts and yet the pivoting is possible within the scope of the invention without the pump housing 4 (completely) must be removed.

Alternative embodiments of the invention will be explained with reference to FIGS. 8 to 12, wherein the features implemented in the various embodiments can also be implemented in various combinations in the embodiment according to FIGS. 1 to 7. It happens

in the embodiments shown in Figures 8 to 12 on that the coupling rod 10 is supported in the course of disassembly of the drive-side housing stub 16 against lowering and / or against (axial) displacement, so that prior to the release of the drive-side hinge 1 a fixation of the coupling rod 10 for service is possible, so that in particular the disassembly of the joint 1 1 is facilitated.

Fig. 8 shows an embodiment in which the displaceable second nozzle portion 16b is provided with an end-side nozzle wall 21, said nozzle wall 21 having a (central) opening 22. In the assembled state, the connecting shaft 9 passes through this opening 22. In the course of disassembly, the displaceable second nozzle section 16b is displaced in the direction of the fixed first nozzle section 16a and in the displaced position the coupling rod 10 is supported by this nozzle wall 21 or the opening 22, then that the coupling rod 10 does not decrease even after separation of the joint 1 1. At the same time via the engaging in the aperture 22 coupling rod 10, a seal of the interior 25 of the pump housing 4, but without in the embodiment of Fig. 8, a special seal in the region of the opening 22 is arranged. Incidentally, Fig. 8 shows an embodiment in which the housing socket 16b is not pushed onto the housing socket 16a, but is inserted into the housing socket 16a. However, the support shown in Fig. 8 can be realized in the same way also in the embodiment shown in Figures 1 to 7.

Fig. 9 shows a modified embodiment in which the support of the coupling rod 10 in the course of disassembly is not realized via an end-side nozzle wall on the displaceable nozzle section 16b, but via an (additional) partition wall 23, in the drive-side

Housing socket 16 is arranged. This partition 23 may, for. B. be integrated at the front end of the fixed nozzle portion 16a in this nozzle portion 16a. The partition wall 23 is also provided with an opening 26 through which the coupling rod 10 is passed, so that the coupling rod 10 is supported at least in the course of disassembly of the drive-side housing stub 16 in the opening 26. In such an embodiment, the dividing wall 23 separates a drive-side chamber 24 (which is formed, for example, by the displaceable neck portion 16b) from the interior 25 of the pump housing.

The embodiment according to FIG. 10 essentially corresponds to the embodiment according to FIG. 9. In addition, however, rinsing connections 28, 29 are arranged here in the area of the second connection section, so that, for example, FIG. B. the drive-side chamber 24, which is formed by the second nozzle portion 16 b, with these flushing ports 28, 29 is provided. In this way, then the space around the (exposed) joint 1 1 can be cleaned without cleaning fluid enters the interior 25 of the pump housing.

Starting from the embodiments shown in FIGS. 9 and 10, FIG. 11 shows a modification in which the coupling rod 10 is supported in the aperture 26 with the interposition of a seal 27. Incidentally, a further modification can be seen in FIG. 11, since the partition wall 23 is not arranged at the front end of the fixed connection section 16a, but an additional component 30 is provided which extends the first connection section 16a, so that the second Stub portion 16b can be pushed onto this additional extension member 30. The partition wall 23 is part of this additional nozzle component 30.

Finally, Fig. 12 shows a modified embodiment in which the disassembly is not realized via an axial displacement, but via a half-shell solution. In turn, a fixed first nozzle section 16a is provided and the second nozzle section 16b is in this case of several partial shells, z. B. formed two half shells. For disassembly, at least one of the half shells can be removed, so that the joint 1 1 is exposed. Also in this embodiment, a partition wall 23 is provided, which is provided with an opening 26 for supporting the coupling rod.

In the illustrated embodiments takes place in the course of disassembly a decomposition of the corresponding joints 1 1, 12, so that z. B. for separating the rotor 2 of the coupling rod 15, the joint 12 itself is disassembled. However, it is also within the scope of the invention, in addition to the joints 1 1, 12 provide separation points or separating elements, so that a separation of the respective parts without disassembly of the joints is possible. For this purpose, reference can be made to models from the prior art, which are not shown in the figures.

Claims

claims:

1 . Eccentric screw pump with at least

a stator (1),

a rotor (2) rotating in the stator,

a drive (3) for the rotor,

a pump housing (4) which is connected to the stator (1) and has at least one inlet or outlet opening (6) for the medium to be conveyed,

a connection housing (14) arranged between pump housing (4) and drive (3),

- One of the drive (3) connected to the connecting shaft (9), which is at least partially disposed in the connecting housing (14) and

- One in the pump housing (4) arranged coupling rod (10) which is connected via a drive-side joint (1 1) with the connecting shaft (9) and via a rotor-side joint (12) with the rotor (2), wherein the pump housing a Drive housing housing (16), to which the connecting housing (14) is connected and wherein the pump housing (4) has a stator housing stub (17) to which the stator is connected, characterized in that the drive-side housing stub (16) is removable in such a way in that the drive-side joint (1 1) can be exposed for maintenance or disassembly.

2. Pump according to claim 1, characterized in that the drive-side housing stub (16) is removable such that the drive-side joint is no longer over the entire circumference of the housing stub (16) surrounded by the housing neck (16).

3. Pump according to claim 2, characterized in that the drive-side housing stub (16) is removable such that the drive-side joint (1 1) is fully exposed in the joint area.

4. Pump according to one of claims 1 to 3, characterized in that the connecting housing (14) in the assembled state of the pump housing (4) and with disassembled drive-side housing socket (16) about a vertical axis of rotation - relative to the base plane of the pump - is pivotable ,

5. Pump according to one of claims 1 to 4, characterized in that the drive-side housing stub (16) has a fixed first nozzle portion (16 a) and a second displaceable nozzle portion (16 b) which axially in the direction of the inlet or outlet port (6). the pump housing (4) on the first nozzle portion (16a) is slidable.

6. Pump according to one of claims 1 to 5, in the embodiment as a funnel pump, characterized in that the inlet opening (4) is formed by an inlet funnel.

7. Pump according to one of claims 1 to 6, characterized in that the coupling rod (10) with a transport device, for. B. a screw conveyor (20) is provided, the z. B. peripherally circumferentially attached to the screw conveyor, z. B. is welded on this.

8. Pump according to one of claims 3 to 7, characterized in that the displaceable second nozzle portion (16b) relative to the fixed first nozzle portion (16a) is sealed with at least one seal.

9. Pump according to one of claims 3 to 8, characterized in that the displaceable second nozzle portion (16b) is rohrformig and preferably at least partially cylindrical or substantially cylindrical.

10. Pump according to one of claims 1 to 9, characterized in that the coupling rod (10) is supported in the course of disassembly of the drive-side housing stub (16) against sinking and / or against displacement or supported.

1 1. Pump according to claim 10, characterized in that the coupling rod (10) of the displaceable second nozzle portion (16 b), z. B. from an end-side nozzle wall (21) is supported, which is preferably provided in an opening (22).

12. Pump according to one of claims 1 to 1 1, characterized in that in the drive-side housing stub (16) a partition wall (23) is arranged, which, for. B. a drive-side chamber (24) of the interior (25) of the pump housing (4) separates, wherein preferably the partition wall (23) has an opening (26) through which z. B. the coupling rod (10) is passed.

13. A pump according to claim 12, characterized in that the coupling rod (10) is supported at least in the course of disassembly of the drive-side housing stub (16) in the opening (26).

14. A pump according to claim 12 or 13, characterized in that the partition wall (23) in a fixed first nozzle portion (16 a) of the drive-side housing stub (16) is arranged.

15. Pump according to one of claims 1 1 to 14, characterized in that the coupling rod (10) with the interposition of a seal (27) in the opening (22, 26) is supported.

16. A pump according to any one of claims 1 to 15, characterized in that the drive-side chamber or the second nozzle portion with one or more flushing connections (28, 29) is provided.