Eccentric screw pump with telescoping housing

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.

Claims

1. An eccentric screw pump comprising: a stator, a rotor rotatable in the stator about an axis, a drive for rotating the rotor about the axis, a pump housing connected with the stator and having a port serving for intake or output of a medium to be conveyed, a drive-connection housing provided between the pump housing and the drive, a drive shaft connected with the drive and in the drive-connection housing, a drive-side coupling connected to the drive shaft of the drive, a rotor-side coupling connected to the rotor, a coupling rod in the pump housing and connected with the drive shaft by the drive-side coupling and with the rotor by the rotor-side coupling, a drive-side housing connector connected between the pump housing and the drive-connection housing, surrounding the drive-side coupling, and having a section that is fixed and a movable section that is telescopically and axially displaceable toward the port of the pump housing and relative to the fixed section into a disassembly position with the movable section axially displaced onto or into the fixed section to fully expose the drive-side coupling for maintenance or disassembly and axially away from the port from the disassembly position into a functional position surrounding and protecting the drive-side coupling, and a stator-side housing connector attached to the stator and supporting the coupling rod in the disassembly position of the movable section.

2. The eccentric screw pump according to claim 1, wherein in the functional position the drive-side coupling is surrounded by the drive-side housing connector all around the drive-side housing connector.

3. The eccentric screw pump according to claim 1, wherein in the disassembly position the drive-connection housing is pivotal about a vertical axis of rotation relative to a base plane of the eccentric screw pump.

4. The eccentric screw pump according to claim 1, wherein the intake port is formed by an inflow funnel.

5. The eccentric screw pump according to claim 1, wherein the coupling rod is provided with an auger attached to an outer surface of the coupling rod.

6. The eccentric screw pump according to claim 1, wherein the movable section is sealed relative to the fixed section with at least one seal.

7. The eccentric screw pump according to claim 1, wherein a partition wall is provided in the drive-side housing connector and separates a drive-side chamber from an interior of the pump housing, the partition wall having a hole through which the coupling rod passes.

8. The eccentric screw pump according to claim 7, wherein the coupling rod is supported at the hole at least in the disassembly position of the drive-side housing connector.

9. The eccentric screw pump according to claim 7, wherein the partition wall is provided in the fixed section of the drive-side housing connector.

10. The eccentric screw pump according to claim 7, further comprising a seal in the hole supporting the coupling rod at least in the disassembly position.

11. The eccentric screw pump according to claim 1, wherein the movable section is provided with one or more multiple flush fittings.

12. The eccentric screw pump defined in claim 1, wherein the fixed section and the movable section of the drive-side housing connector are cylindrically tubular.

13. An eccentric screw pump comprising: a stator; a rotor rotatable in the stator about an axis; a drive for rotating the rotor about the axis; a pump housing connected with the stator and having at least one port for intake or output of a medium to be conveyed; a drive-connection housing provided between the pump housing and the drive; a drive shaft connected with the drive and in the drive-connection housing; a drive-side coupling connected to the drive shaft of the drive; a rotor-side coupling connected to the rotor; a coupling rod in the pump housing and connected with the drive shaft by the drive-side coupling and with the rotor by the rotor-side coupling; a drive-side housing connector connected between the pump housing and the drive-connection housing, surrounding the drive-side coupling, and having a section that is fixed and a movable section that is telescopically and axially displaceable toward the at least one port of the pump housing into a disassembly position with the moveable section axially in or on the fixed section to fully expose the drive-side coupling and axially away from the at least one port from the disassembly position into a functional position surrounding and protecting the drive-side coupling; a stator-side housing connector connected to the stator and the at least one port being between the drive-side housing connector and the stator-side housing connector; and a support engaged to the coupling rod to support the coupling rod in the disassembly position of the drive-side housing connector.

14. The eccentric screw pump defined in claim 13, wherein the support is part of the drive-side housing connector.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) In the following, the invention will be explained in greater detail with reference a drawing that merely represents an embodiment. In the drawing:

(2) FIG. 1 is a vertical section through an eccentric screw pump according to the invention;

(3) FIGS. 2 to 7 show a detail from the object according to FIG. 1, in different disassembly positions, (FIGS. 2 to 5 in side view/partial section, FIGS. 6 and 7 in top view/partial section);

(4) FIG. 8 is a view like FIG. 3 of a second embodiment of the invention in a functional position;

(5) FIG. 9 is a view of a third embodiment of the invention (in a functional position corresponding to FIG. 2);

(6) FIG. 10 shows a fourth embodiment of the invention;

(7) FIG. 11 shows a fifth embodiment of the invention; and

(8) FIG. 12 shows a sixth embodiment of the invention.

SPECIFIC DESCRIPTION OF THE INVENTION

(9) In the drawing, an eccentric screw pump basically has a stator 1, a rotor 2 rotatable in the stator 1, and a drive 3 for the rotor 2. A pump or intake housing 4 is connected with the stator 1 on the intake side, for example. A housing or so-called pressure connection part or piece 5 is connected with the stator on the output side. The pump housing 4 has an intake port 6 through which the medium to be conveyed is supplied; this medium is conveyed to the pressure connector 5 from the pump housing 4 through the stator/rotor. The drive 3 is equipped with an (unillustrated) integrated drive shaft that is connected with a drive shaft 9. This drive shaft 9 is a stub shaft in this embodiment. The rotor 2 is connected with the drive shaft 9 by a coupling rod 10 that is connected with the drive shaft 9 by a drive-side coupling 11 and with the rotor 2 by a rotor-side coupling 12. For liquid-tight separation of the pump housing 4 relative to the surroundings or relative to the drive, the drive shaft 9 is sealed by a shaft seal 13. This shaft seal 13 is for example a slide ring seal. No details are shown in the drawing.

(10) A drive-connection housing 14 or so-called lantern is provided between the pump housing 4 and the drive 3. Such a drive-connection housing 14 is connected to the pump housing 4 at one end and to the drive 3 on the other end and supports them. In this regard, the drive-connection housing 14 can be attached to a base 15. The shaft seal 13 is connected with this drive-connection housing 14.

(11) In the embodiment shown in FIGS. 1 to 7, the eccentric screw pump is a funnel pump. The intake port 6 is a funnel. The coupling rod 10 is provided with an auger 20 welded for example onto the outer surface of coupling rod 10.

(12) The pump housing 4 has a drive-side tubular connector 16 connected to the drive-connection housing 14, and the drive-side coupling 11 is provided in this drive-side housing connector 16.

(13) Furthermore, the pump housing 4 has a stator-side (tubular) housing connector 17 connected to the stator 1, and the stator-side coupling or rotor-side coupling 12 is for example inside this stator-side housing connector 17. In this regard, only the drive-side housing connector 16 is shown in FIGS. 2 to 7. The stator-side housing connector 17 is not shown in FIGS. 2 to 7.

(14) According to the invention, the drive-side housing connector 16 can be disassembled or dismantled in such a manner that the drive-side coupling 11 can be exposed for the purpose of maintenance and/or disassembly. This is evident from a comparative consideration of FIGS. 2 to 7 and, in particular, from FIGS. 2 and 3. In this regard, it can be seen in the drawing that in this embodiment the drive-side coupling 11 is fully exposed by disassembly of the drive-side housing connector 16, i.e. the coupling is no longer surrounded by the housing connector 16 and is fully exposed in this region. The entire length of the coupling is normally exposed, but at least in the coupling region or in the plane of the coupling.

(15) In this regard, the drive-side housing connector 16 consists of a first, fixed connection-piece section 16a and a second displaceable connection-piece section 16b. The second section 16b is axially displaceable in the illustrated embodiment. Comparison FIGS. 2 and 3 shows that the region of the drive-side coupling 11 is exposed by axial displacement of the second section 16b, and consequently becomes accessible. In the embodiment shown, displacement of the second section takes place axially in the direction toward the first section 16a and consequently toward the intake port 6 or of the funnel of the pump housing 4.

(16) In this regard, it can be seen that at least one seal 18 is provided between the first section 16a and the second section 16b and seals off the first section 16a relative to the second section 16b in liquid-tight and pressure-tight manner, specifically in the assembled state shown in FIG. 2. In this embodiment, the seal 18 is attached to the first section 16a on its outer surface (for example in a groove). Alternatively, however, such a seal can also be provided on the second section 16b on its inner surface.

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

(18) After the second section 16b has been pushed onto the first section 16a (FIG. 3), the cuff 19 of the drive-side coupling 11 can subsequently be removed, and the coupling can be dismantled (see FIG. 4). Subsequently, the coupling rod 10 (together with the rotor 2 connected with it) can be pushed away or pulled out from the drive side (see FIG. 5).

(19) In a particularly advantageous further development, the possibility now exists as shown in FIG. 6 of pivoting the drive-connection housing 14 about a vertical axis of rotation A (see FIG. 6), specifically without the pump housing 4 itself having to be removed. This is because corresponding free space occurs as the result of pushing the second section 16b back, so that the drive-connection housing 14 is pivotal in the manner shown. In this regard, the position of the vertical axis A is relative to the base 15 or a corresponding foundation. Basically, however, the possibility also exists of installing such a pump in a different orientation. If installation takes place in the vertical direction, for example, then the base plate is vertical, so that the drive-connection housing 14 is then pivoted about a horizontal axis, but this axis then also stands perpendicular to the base plate or the corresponding reference plane.

(20) According to FIG. 7, the drive shaft 9, which is a stub shaft, can be pulled out of the drive-connection housing 14 after pivoting takes place. This is interesting because the stub shaft is a wear-prone part that 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. Instead, it is sufficient to merely open or disassemble the pump housing 4 on the drive side, in the manner described, and subsequently to pivot the drive-connection housing 14 in the manner described. Alternatively or in addition the shaft seal, for example the slide ring seal 13, can also be replaced.

(21) In this regard, FIGS. 6 and 7 show the pump in a top view, while FIGS. 2 to 5 show the pump in a side view and in vertical section. In this regard, it can be seen in FIGS. 6 and 7 that the lantern or drive-connection housing 14 can be attached to the base plate with fasteners, for example four screws. For pivoting, three of these screws can now be removed, and the remaining screw can be correspondingly released or loosened, so that the drive-connection housing 14 can then be pivoted about the axis A formed by this screw. In this regard, concepts known from the state of the art can basically be used for attachment of the lantern, and nevertheless pivotability is made possible within the scope of the invention, without the pump housing 4 having to be removed (completely).

(22) FIGS. 8 to 12 show alternative embodiments of the invention where characteristics implemented in the different embodiments can be implemented, in different combinations, also in the embodiment according to FIGS. 1 to 7. In this regard, the important thing in the embodiments shown in FIGS. 8 to 12 is that the coupling rod 10 is supported to prevent dropping and/or to prevent (axial) displacement during opening-up of the drive-side housing connector 16, so that before the drive-side coupling 11 is released, fixation of the coupling rod 10 for service purposes becomes possible before release of the drive-side coupling 11, so that in particular, disassembly of the coupling 11 is facilitated.

(23) In this regard, FIG. 8 shows an embodiment in which the second movable section 16b is provided with a connection-piece end wall 21 that has a (central) hole 22. In the assembled state, the drive shaft 9 passes through this hole 22. During disassembly, the displaceable second connector 16b is displaced toward the fixed first section 16a, and in the displaced position the coupling rod 10 is supported by this connector wall 21 and fits into the hole 22, so that the coupling rod 10 does not drop even after separation of the coupling 11. At the same time, sealing of the interior 25 of the pump housing by the coupling rod 10 that engages into the hole 22 takes place, but without a special seal being provided in the region of the hole 22 in the embodiment according to FIG. 8. Furthermore, FIG. 8 shows an embodiment in which the housing connector 16b does not telescope outside the housing connector 16a, but telescopes inside the housing connector 16a. However, the support shown in FIG. 8 can also be implemented in the same manner as in the case of the embodiment shown in FIGS. 1 to 7.

(24) FIG. 9 shows a modified embodiment in which support of the coupling rod 10 during disassembly is implemented not by a connection-piece end wall on the displaceable section 16b, but rather by an (additional) partition wall 23 provided in the drive-side housing connector 16. This partition wall 23 can be on the end-face end of for example the fixed section 16a. The partition wall 23 is also provided with a hole 26 through which the coupling rod 10 fits, so that the coupling rod 10 is supported in the hole 26 at least during disassembly of the drive-side housing connector 16. In such an embodiment, the partition wall 23 divides a drive-side chamber 24 (formed for example by the displaceable connector part 16b) from the interior of the pump housing.

(25) The embodiment according to FIG. 10 essentially corresponds to the embodiment according to FIG. 9. In addition, however, here flush fittings 28, 29 are provided in the region of the second section, so that for example the drive-side chamber 24 formed by the second section 16b is provided with these flush fittings 28, 29. In this manner, the space around the (exposed) coupling 11 can then be cleaned without cleaning liquid getting into an interior 25 of the pump housing.

(26) Proceeding from the embodiments shown in FIGS. 9 and 10, FIG. 11 shows a modification in which the coupling rod 10 is supported in the hole 26 with the interposition of a seal 27. Furthermore, a further modification can be seen in FIG. 11, because there the partition wall 23 is not provided at the end-face end of the fixed section 16a, but rather is an additional component 30 that extends the first section 16a, so that the second section 16b can be pushed onto this additional extension component 30. The partition wall 23 is a component of this additional connector component 30.

(27) Finally, FIG. 12 shows a modified embodiment, in which disassembly is implemented not by axial displacement, but rather by a half-shell solution. Once again, a fixed first section 16a is provided, and the second section 16b is formed by partial shells, for example two half-shells, in this case. For disassembly, at least one of the half-shells can be removed, so that the coupling 11 is exposed. In this embodiment, as well, a partition wall 23 is provided that has a hole 26 for supporting the coupling rod.

(28) In the embodiments shown, dismantling corresponding couplings 11, 12 takes place during disassembly, so that for example for separation of the rotor 2 from the coupling rod 15, the coupling 12 itself is dismantled. However, it also lies within the scope of the invention to provide separation points or separation elements in addition to the couplings 11, 12, so that separation of the respective parts is possible without dismantling the couplings. For this purpose, it is possible to use models from the state of the art, which are not shown in the drawing.