EP1445490B1 - Pumping arrangement - Google Patents

Abstract

The pump unit (1) especially for the delivery of a paste-form substance from a container (2) has a first coupling (3) for a pressure-tight connection to the container, and a second coupling (4) for connecting to a drive unit (5). The pump of the pump unit has a rotor connected to the drive, and the pump is connected pressure-tight to a pressure chamber which in its turn is connected pressure-tight to a connection (9) for a hose to transport the paste-form substance from the pressure chamber. An independent claim is included for a system for the making available of a paste-form substance, especially at building sites.

Description

The present invention relates to a pumping device as well as to a pumping device containing system according to the independent claims.

Pumping devices for removing pasty media from storage containers are known in principle. For example, it is common to place a pasty material in a device for continuously conveying a pumpable material. In this case, the material is mixed regularly in a first chamber of this device and a downstream pump, the material pressed through a mortar tube.

A disadvantage of these complex devices according to the prior art is that in these expensive devices and the associated relatively long transport routes even the smallest leaks in the system leads to a loss of pump power and thus the material delivery is impossible. First of all, in these complex devices, there is a high outlay for troubleshooting, which results in the high number of individual components involved and a high cleaning effort after the end of the conveyance. This means on the one hand a high cost burden by these known devices and on the other hand a cumbersomeness, which makes it difficult to transport in particular to distant construction sites.

DE 195 42 527 A1 shows a conveyor device for conveying viscous flowing medium with a feed pump with all the technical features of the preamble of claim 1, which has a helical rotor inserted in a housing. The rotor is connected via a cardan shaft with an associated gear. As a pump in this case a delivery pump is provided with a helical rotor which is movable in an inner rubber jacket. Subsequently, a pressure chamber for further conveying pasty medium is connected to this pump.

The present invention has for its object to provide a pumping device or a pumping device containing this system, which is physically small and ensures low cost reliable delivery of pasty products at a high pumping capacity.

This object is achieved by a pumping device or a system according to the independent patent claims.

Claim 1 claims a pumping device, in particular for sucking pasty media from storage containers such as disposable containers or the like, wherein the pumping device comprises a coupling for coupling a drive device, wherein the pumping device comprises a pump with a rotor connectable to the drive device and this pump is pressure-tightly connected to a pressure chamber, which in turn pressure-tight with a connection for a hose for conveying the pasty medium from the pressure chamber out, wherein the pump is a screw pump, which has a stator with an inner rubber jacket, wherein the rubber jacket to the pressure chamber toward enlarging the annulus for pasty medium has a discharge slope, which extends in the axial direction over at least 10 mm and the pumping device has a coupling for pressure-tight connection to the storage container and the pump is arranged downstream of the coupling for the pressure-tight connection to the storage container.

The term "pressure-tight" in the present case is to be understood to mean a pressure-tightness which allows an unimpeded suction flow of the pasty medium to be conveyed out of the storage container, without the delivery being stopped or an air being introduced into the pasty medium. Preferably, the pressure tightness is at least 5 bar.

The pumping device has the advantage that it can be designed very compact and thus can be applied to distant construction sites with little effort. In this case, the pump device can be coupled with a first coupling to a storage container, preferably a disposable container, and, on the other hand, can be coupled to a second coupling for coupling a drive device. The flow of the pasty medium from the disposable container takes place through the region of the first clutch in a downstream pump whose rotor is driven by the drive device and wherein this pump is pressure-tight connected to a subsequent pressure chamber, which in turn connected pressure-tight with a connection for a hose for conveying the pasty fluid from the pressure chamber out is.

Thus, the structure of the system is particularly easy to ensure decentralized, since the pumping device is easily mounted between a disposable container to be emptied and a corresponding drive device and thus a system for providing pasty products is given.

A particularly advantageous development provides that the flow cross-section in the pressure chamber from the end of the pump to the connection to a hose to be connected is always greater than the flow cross-section at the outlet of the terminal. In this case, the term "flow cross-section" is understood to mean the free cross-sectional area through which, as seen from the pump, connection to actually paste-like medium is possible. This flow cross-section is therefore conceivable as a surface which is perpendicular to an imaginary flow thread, which extends from the center of the pump outlet to the center of the terminal, the flow cross-sectional areas are always perpendicular to this imaginary flow thread.

This ensures that always a sufficiently high pressure on the hose loads. Due to the enlarged cross-sectional area in the region of the pressure chamber is always with sufficient pressure an outflow to Connection possible, there are no dead zones within the pressure chamber, which would a sudden pressure drop (with the risk of introducing air and drying) would recover.

Advantageously, it is possible to dimension the flow cross-section in the pressure chamber from the end of the pump to the connection in particular in the area before the connection significantly larger, for example, more than 10% larger than in the outflow cross-section of the terminal 9. It will, as in the entire present application, assumed that the diameter of the output cross-section of the terminal is at least equal to the diameter of the connected hoses or even larger.

However, it is particularly advantageous to achieve a gradual (preferably, for example, conical) and continuous increase in the cross-sectional area in the direct transition region from the pump to the pressure chamber so as to ensure the unimpeded flow of pasty medium from the pump into the pressure chamber. In this case, it is advantageous on the one hand to provide a tapered outlet opening on the pump, and in addition a corresponding enlarging piece with a conical annular surface can be provided for widening the pump diameter to the diameter of the pressure housing. In addition, the protruding head of the rotor, which runs, for example, in a screw pump, be led out far enough from the screw pump or be beveled to the screw pump to ensure the largest possible annulus and the largest possible flow cross-section, so that it in this area does not come to blockages. It is particularly important that in this area always the flow cross-section is greater than the cross-section at the outlet of the terminal, for example by 10%, preferably by 20%, more preferably by 30% larger in cross-sectional area.

As a pump, a screw pump is provided, which has a stator with an inner rubber jacket. According to the invention, the rubber jacket to the pressure chamber towards a discharge slope, which extends in the axial direction of the pump over at least 10 mm, preferably 15 mm, particularly preferably 20 mm. It is particularly advantageous in this case that the angle of this outlet bevel relative to the surrounding jacket of the stator forms an angle α (see FIG. Fig. 3b ) of 25-65 °, preferably 50-60 °.

This ensures that at the output of the pump, the annulus for the pasty medium is as large as possible, so that it can not lead to blockages and a particularly good pressure build-up is possible.

Advantageous developments of the present invention are specified in the dependent claims.

The screw pump has a stator with an inner rubber jacket. By this construction, a pressure build-up of the pump to the pressure chamber of up to 60 bar, preferably up to 80 bar possible. It is possible that to be conveyed pasty material by over 60 m long hoses (which, for example, have an inner diameter of 25 mm) to promote.

The first clutch with which the pump or the Pumping device is connected to a storage container, can be carried out in several ways. It is crucial that this connection is pressure tight and easy coupling is possible. It is thus possible, for example, to design this first coupling as a screw thread, rotary quick-action coupling (such as in fire hose), as a lockable plug-in closure or as a simple plug-in closure. A simple plug-in closure with a corresponding counter-lock is a particularly simple variant, since the suction pressure applied by the pump ensures that the pumping device is attracted to the container. On the container side, in the case of a system according to the invention, a non-return flap can be provided, which prevents a discharge of pasty medium from the container when the pump device is removed.

A further advantageous development provides that the pressure chamber arranged downstream of the pump has a corresponding pressure chamber housing. This can be designed so that the stator of the screw pump in this pressure chamber housing can be inserted or with this (for example via a double thread) can be clamped. Thus, in a simple manner, for example for cleaning or maintenance purposes, the pump can be separated from the pressure housing.

A further advantageous development provides that the pressure chamber has a pressure chamber housing and that the stator of the pump (screw pump) in the pressure chamber housing can be inserted or clamped with this. In particular, here offers a bracing means of, for example, two axially along the pump running tie rods. This makes it possible, on the one hand, a strong coupling and pressure tightness To achieve these elements, on the other hand, an easy interchangeability of the pump or easy cleaning is possible.

A particularly advantageous development provides that the rotor of the pump is connected via an adapter to the drive element of the drive device. Here it is possible, for example, that this adapter has driver connections on both sides, which on the one hand ensure the connection to a drive element of the drive device and on the other hand, the rotor drive of the pump is realized. In particular, it is possible with this adapter structure to avoid a pressure loss in the region of the drive element of the drive device. For this purpose, the adapter can be stored and sealed, for example, in the pressure chamber housing, even when uncoupling the drive element, this does not lead to a pressure drop in the pressure chamber. For storage, it is particularly appropriate that the adapter is mounted in the pressure chamber housing via a double-sided rubber seal with an intermediate fat pad.

In a particularly advantageous embodiment of the rotor to the pressure chamber housing out, ie drive side, eccentrically movable. That is, the end of the rotor protruding into the pressure chamber housing moves eccentrically due to the contour of the inner rubber sheath of the screw pump. An adapter provides eccentric compensation for the purely axially rotating drive element. It comes here so to speak to a gimbal balance. This is preferably done by the adapter itself. However, it is also possible that on this adapter left and right in the axial direction then subsequently connecting parts are given, which then form a "bridging" on the one hand to the rotor and on the other hand to the drive element, for example, an external drill down.

It is particularly advantageous that the adapter is in the axial direction of the pumping device between the pump and the center of the terminal, i. offset relatively far to the pump. This causes the eccentric compensating movement of the adapter to result in a "push-in" of pasty medium towards the connection and thus towards the hose. It is particularly important for the present invention that the adapter is oriented relatively far to the pump and is not stored in the rear dead space of the pressure chamber housing. As the "center" of the terminal, in the present case, the middle point of the transition area from the pressure chamber housing to the terminal is seen, which is projected onto the central axis of the pressure chamber housing so that the projection line is perpendicular to the axial center line of the pressure chamber housing. In this case, it is always assumed that the bearing points of the adapter, these are preferably axes of rotation, which should therefore be accommodated in the region of the pressure chamber housing, which lie between the pump outlet on the one hand and the center of the above-described solder of the terminal. But it is also possible that the rear, i. directed away from the pump axis of the adapter is up to a diameter of the end cross-section of the port further away from the pump.

It is particularly advantageous in this case that the adapter has an "H" shape, as a result of which, on the one hand, easy mountability and good storage are possible, In addition, the "paddle-shaped" shape causes a particularly good promotion or a particularly good pushing of the pasty medium to the connection.

Also advantageous is a coupling of the adapter or a subsequent to the adapter connection part to the rotor head of the protruding from the pump rotor. In this case, it is particularly recommended that a "T" -shaped groove is specified. This makes it possible that the adapter or the adjoining thereto connecting part to the rotor head can be controlled in two directions with an angular offset and engages positively in each case in the end stops. In this case, it is possible to achieve at the high pressures, for example by an opposite rotation, that "pressure is taken out of the system".

A further advantageous development provides that the second clutch is a rotary quick-release coupling (this is particularly useful in the coupling of mobile electrical drives, such as drills, etc.) or a shell clutch (this is useful especially for larger engines). The electric drive device may be, for example, a continuously variable drive or a hand drill, which has a power consumption of only 1.8 kW. This is advantageously connected via a floor stand with the ground, so that it does not have to be held by hand, but automatically is fixed and thus a fixed distance to the container is given.

The system according to the invention is particularly suitable for containing disposable containers filled with pasty media, such as ready-mixed mortar or paint. The corresponding disposable container, the characteristics of the disposable container after the DE 202 13 063 U1 , filed on August 21, 2002, assigned to the same assignee. With the system according to the invention or the pumping device according to the invention, it is possible to transport ready-mixed mortar from the disposable container over distances of up to 60 m, preferably up to 100 m, by means of a hose to be connected to the pumping device.

The pump device is characterized in particular by an easy cleanability. For this purpose, after uncoupling the pumping device on the first clutch, the pump is plugged, for example, into a bucket of water and the drive device is switched on, so that self-cleaning is achieved by flushing through the pumping device.

Further advantageous developments are specified in the remaining dependent claims.

Fig. 1

ein erfindungsgemäßes System zur Bereitstellung pastöser Produkte,

Fig. 2

einen Schnitt A-A gemäß Fig. 1, welche Details der erfindungsgemäßen Pumpvorrichtung zeigt,

Fig. 3a

Seitenansicht und Teilschnitt einer weiteren Ausführungsform der Pumpvorrichtung,

Fig. 3b

einen teilweise freigelegten Querschnitt einer erfindungsgemäßen Schneckenpumpe aus Fig. 3a sowie

Fig. 3c

eine Einzelansicht eines erfindungsgemäßen Adapters 12' aus Fig. 3a.

The invention will now be explained with reference to several figures. Show it:

Fig. 1

an inventive system for providing pasty products,

Fig. 2

a section AA according to Fig. 1 which shows details of the pumping device according to the invention,

Fig. 3a

Side view and partial section of a further embodiment of the pumping device,

Fig. 3b

a partially exposed cross-section of a screw pump according to the invention Fig. 3a such as

Fig. 3c

a single view of an adapter 12 'according to the invention Fig. 3a ,

Fig. 1 shows an inventive system 14 for providing pasty products, especially on construction sites. This shows a pumping device 1 which is connected to a storage container 2 in the form of a disposable container. The connection is made via a first, pressure-tight coupling 3, which is designed here as an external thread, which is screwed into the container 2. For details of the container, reference is made to the registered German utility model of the same applicant under the file number DE 202 13 063 U1 The relevant features are incorporated by reference herein in their entirety. The storage container 2 contains in its interior pasty media 15, such as ready-mixed mortar or color or color concentrate. The drive of the pumping device 1 is effected by a coupled via a second clutch 4 drive device 5. The clutch 4 is designed as a rotary coupling, so that the run as a continuous drive drive device 5 is easily removable. The infinitely variable drive has a power consumption of 1.8 kW and is suitable for pumping can be fixed in the floor via a floor stand 16.

With the in Fig. 1 shown system is thus achieved that contained in a closed and pressure-tight disposable container 2 pasty medium 15 is guided by the pumping device 1 to a pressure-tight connected hose 13 and at the remote from the pumping device end of the hose 13, the removal of pasty media is possible. Due to the high pumping capacity of the present pumping device hose lengths up to 60 m, preferably up to 100 m are possible.

The exact internal structure of a pumping device 1 is off Fig. 2 which shows a section according to AA.

This is a cross section of the pumping device, which is particularly suitable for aspirating pasty media from storage containers 2, such as disposable containers or the like. The pumping device 1 has a first coupling 3 for pressure-tight connection to the storage container and a second coupling 4 for coupling a drive device 5 (see FIG. Fig. 1 ), wherein the pump device 1 of the first clutch downstream of a pump 6 with a connectable to the drive device 5 rotor 7 and this pump is pressure-tight manner connected to a pressure chamber 8, which in turn pressure-tight with a port 9 for a hose 13 (s. Fig. 1 ) is connected to convey the pasty medium out of the pressure chamber. The pump 6 is in this case made of screw pump. The rotor 7 is guided in this case in a stator 10. The inner walls of the stator 10 are provided with an inner rubber sheath. It With the pump 6 it is possible to build up a pressure of over 60 bar at the end which is repellent from the container. The stator 10 is clamped in a manner not shown with a multi-part pressure chamber housing 11. For cleaning or maintenance purposes, it is separable from the pressure chamber housing. On a first part 11 a of the pressure chamber housing 11, a collar is screwed, the external thread of the first coupling 3 for connection to a storage container 2 (s. Fig. 1 ) having. At the rear end of the pressure chamber 8, the second part of the pressure chamber housing, the part 11 b is arranged. This has a bore with an adapter 12 disposed therein. This adapter has in the region of the bore in the pressure chamber housing at each of the ends of the bore a rubber seal and in between a grease pad for permanent lubrication. The adapter has dog connections at each of its ends. At the left end, this is a substantially "U" shaped fork, which is connected to the rotor 7 for driving this rotor. On the other hand, the adapter is designed so that it by a drive element 16 of the drive device 5 (s. Fig. 1 ) is drivable. The pressure chamber opens into an opening which serves as a connection 9 for a hose 13 (see FIG. Fig. 1 ) is executed.

The following is the embodiment after Fig. 3a again explained exactly. This is a pumping device 1 ', in particular for sucking pasty media from storage containers 2 as disposable containers, for example those as in the DE 202 13 063.0 . DE 103 14 146.4 or EP 03090261.3-1261 ( 1 394 070 ) of the same applicant.

The pumping device has a first coupling 3 'for pressure-tight connection to the storage container and a second coupling 4' for coupling a drive device, wherein the pumping device of the first coupling downstream of a pump 6 'with a connectable to the drive device rotor 7' contains and this pump pressure-tight with a pressure chamber 8 'is connected, which in turn is pressure-tight manner with a connection 9' for a hose 13 for conveying the pasty medium from the pressure chamber out connected.

The first clutch 3 'in this case has an annular cross-section. This in Fig. 3a right-hand end of this first clutch or clutch sleeve closes flush with the housing of the pump 6 '(see Fig. 3b ) (This moves the pump as far to the right as possible, ie to the material in the container, so that the flow is as continuous as possible). The pump 6 'is clamped over two circumferentially distributed tie rods 18' between the pressure chamber housing 11 'and the first clutch 3'. Here, the pump 6 'on a Abdrehung, against which the sealing ring 19' is pressed by the sleeve 3 '. The tightening of the tie rods 18 'follows by the unscrewing of nuts on the left-side end of the tie rods, so that the pump 6' is arbitrarily strong braced. These are possibly in the region of the sealing ring 19 'and the transition 20 'from the pressure chamber housing to provide the pump ring seals. The ring seals are in view of the very high pressures of up to 50 bar and more, which can prevail inside the pump to provide advantageous.

The first coupling 3 'has an external thread on the right-hand side, which can be pressure-tightly connected to a corresponding outlet of a disposable container or of another vessel, so that approximately constant pressure prevails throughout the system. On the thread 3 '(s. Fig. 3a ) can also be a rotatable quick-release coupling ("fire hose coupling") are screwed, which is then flanged into a the female thread of the disposable container / storage container 2 screwed counterpart and quick-clamped.

Essential for the present invention, inter alia, the geometry of the annular space in the region of the transition from the pump 6 'to the pressure chamber 8'. Here, a transition 20 ', which is formed on the inside as a conical annular surface provided. Further details are given in the description of Fig. 3b received.

In Fig. 3a is indicated by a dotted line a rotor head 7a ', which is positively connected to a connection part 17' (closer s Fig. 3b ). On the left side, an adapter 12 'adjoins the connection part 17' for gimbal compensation. The adapter 12 'has two axes of rotation 25' and 26 ', respectively. It is advantageous that the adapter is offset with its axes of rotation relatively far to the pump 6 'out. So it is desirable that the axes 25 'and 26' with respect to the axial Center axis 27 'of the pumping device are arranged on the right side with respect to the central axis 28' of the terminal 9 '. In other words, a line which is perpendicular to the transition surface of the pressure chamber housing to port 9 'in the center of this surface and is perpendicular to the central axis 27' of the pumping device, always located to the left of the axis 25 '.

On the left side of the adapter 12 'is followed by a connecting part 21', which is also mounted in the pressure chamber 8 '. This is a storage in a Teflon bushing. Here, a floating bearing and the left-side cross a fixed bearing is characterized by the right-hand cross, the seal to the left or right in this bearing assembly is pressure-tight to 50 bar. On the left side of the bearing assembly is a collar 22 'of the connecting part 21', with which a drive element (such as a drill) is positively connected, the corresponding drive machine is connected via a second clutch 4 'to the pump device. To the flange 4 'can be flanged (for example, a frequency-controlled 3 kW electric motor), for example (in addition to a mobile drill, etc.) and a firmly anchored motor.

The connection 9 ', through which the removal of pumped pasty medium takes place, also has a flow sensor, with which blockages are detectable, which would otherwise be imperceptible visually. This flow sensor is mounted, for example, in the pressure chamber housing 11 'and can already be factory calibrated. The flow sensor is, for example, a mechanical sensor that works via force-distance relationship. This is about it For a given material at a certain flow rate, a certain force acts on the flow sensor. When falling below this force, for example, a signal is triggered, indicating a malfunction of the pump. Thereafter, for example, by a change of direction of the drive device, a pressure relief possible.

The following is closer again FIGS. 3b and 3c received.

Fig. 3b shows the pump 6 'from Fig. 3a in partially cut condition. It can be seen that this pump, which is designed as a screw pump, a stator 10 'has. This has on the right side a Abdrehung on which the sealing ring 19 'can be plugged (s. Fig. 3a ). The stator has an outer metal sheath 10b 'and a rubber sheath 10a' disposed therein in which a helically wound rotor is pressure generating. It can be seen that the pump on the right side has an inlet slope, which is designed as a chamfer of the rubber jacket 10a '.

On the left side, ie the direction according to the invention towards the pressure chamber, chamfering of the rubber jacket 10a 'is shown. This runs as a substantially concentric annular surface from the point x1 to the point x2. The distance between the points x1 and x2 is in this case in the purely axial direction 27 'at least 10 mm, preferably 15 mm, particularly preferably 20 mm. The angle α between the inner surface of the metal shell 10b 'of the stator and the inclined edge of the rubber jacket 10a' is preferably 25-65 °, more preferably 50-60 °.

The rotor 7 ', which runs inside the rubber jacket 10a', has a rotor head 7a '. This also has inlet slopes, which thus increase the annular space around the rotor 7 'around. The rotor head has a "T" -shaped groove, in which a connection part 17 ', which is connected to the adapter 12', is mounted in a form-fitting manner. This ensures that in the in Fig. 3b shown position in which a pin of the connecting part 17 '(marked as black painted circle) is below. In this state of the right-hand rotation, a pumping movement for conveying pasty medium to the pressure chamber is achieved. In a reversal of the drive direction, the in Fig. 3b shown black painted circle on the upper stop positively engage, thereby rotation in the direction of a left rotation is possible and thus a pressure relief.

Finally shows Fig. 3c an adapter 12 '. This is essentially worked out in the plane of the paper as a flat cross section, in which Fig. 3c it has the shape of a "H" shown plan view. On the one hand, a gimbal eccentric compensation is ensured by the relatively close axes of rotation, in addition, the promotion of pasty medium towards the terminal 9 'is ensured by the central surface of the adapter.

Claims (13)

1. Pumping device (1), in particular for suctioning pasty media out of storage containers (2), such as disposable containers or the like, the pumping device having a first coupling (3) for pressure-sealed connection to the storage container and also a second coupling (4) for coupling to a drive device (5), the pumping device containing, disposed after the first coupling, a pump (6) with a rotor (7) which can be connected to the drive device and this pump being connected in a pressure-sealed manner to a pressure chamber (8) which in turn is connected in a pressure-sealed manner to a connection (9) for a hose (13) for conveying the pasty medium out of the pressure chamber, the pump (6, 6') being a screw pump which has a stator (10, 10') with an inner rubber casing (10a'),
   characterised in that
   the rubber casing (10a') has, towards the pressure chamber (8'), an outflow bevel for increasing the annular space for pasty medium, which bevel extends in the axial direction over at least 10 mm.
2. Pumping device according to claim 1, characterised in that the through-flow cross-section in the pressure chamber (8, 8') from the end of the pump (6, 6') to the connection (9, 9') is always greater than the flow cross-section at the outlet of the connection.
3. Pumping device according to one of the preceding claims, characterised in that the first coupling is configured as a screw thread, fast rotary coupling, lockable plug-in seal or simple plug-in seal.
4. Pumping device according to one of the preceding claims, characterised in that the pressure chamber (8, 8') has a pressure chamber housing (11).
5. Pumping device according to claim 4, characterised in that the stator (10) can be inserted into the pressure chamber housing or can be clamped to the latter.
6. Pumping device according to one of the claims 3 to 5, characterised in that the stator (10, 10') can be clamped with tie rods between the front end of the pressure chamber housing (11') and a ring (19') of the first coupling (3').
7. Pumping device according to one of the preceding claims, characterised in that the rotor (7, 7') of the pump (6, 6') is connected via an adaptor (12, 12') to a drive element (16) of the drive device.
8. Pumping device according to claim 7, characterised in that the adaptor (12, 12') is mounted in the pressure chamber housing (11, 11').
9. Pumping device according to one of the claims 7 or 8, characterised in that the rotor (7, 7') can be moved eccentrically on the drive side and the adaptor (12) effects compensation for the eccentricity relative to the drive element (16).
10. Pumping device according to claim 9, characterised in that the mounting of the adaptor (12') is situated in the axial direction of the pumping device between pump (6, 6') and the centre of the connection (9, 9').
11. Pumping device according to claim 10, characterised in that the adaptor (12') has two axes of rotation which are situated in the axial direction between pump (6') and the centre of the connection (9').
12. Pumping device according to one of the claims 7 to 11, characterised in that the rotor (7, 7') has a rotor head (7a') into which the adaptor and/or a connection part (17') engage on the drive side, rotor head, connection part or adaptor having at least one "T"-shaped groove for the form-fit engagement relative to each other during actuation of the rotor in the clockwise and/or anticlockwise direction.
13. System (14) for providing pasty media (15), in particular on building sites, characterised in that this has a pumping device (1, 1') according to one of the preceding claims and the system contains a container (2) with pasty media filled therein and also an electrical drive device (5) coupled to the pumping device.

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