EP2655888A1

EP2655888A1 - Pump device

Info

Publication number: EP2655888A1
Application number: EP11802713.5A
Authority: EP
Inventors: Sascha Korupp; Michael KAHSNITZ
Original assignee: Herborner Pumpenfabrik J H Hoffmann GmbH and Co KG
Current assignee: Herborner Pumpentechnik & Co KG GmbH
Priority date: 2010-12-22
Filing date: 2011-12-20
Publication date: 2013-10-30
Anticipated expiration: 2031-12-20
Also published as: KR20140031188A; DE102010061494A1; US10301001B2; US20130280107A1; WO2012084918A1; CA2822730A1; EP2655888B1; CA2822730C; KR101879007B1

Abstract

The invention relates to a pump device for operating vacuum drainage systems and for delivering waste water, especially in watercraft. The pump device comprises a drive device having a driving shaft which in turn comprises a first shaft end and a second shaft end and which can be rotated by means of the driving device. The pump device further comprises a centrifugal pump which has at least one impeller that is connected to the driving shaft in the region of the first shaft end so as to transmit torque.

Description

pumping device

The invention relates to a pumping device for operating vacuum drainage systems and for conveying sewage, in particular on water vehicles, such as e.g. Ships.

Such pump devices are basically known and are used, for example, to operate drainage systems on vessels. Such drainage systems are used to dispose of wastewater, which occur on ships in closed systems. The disposal can be done both in a collection, in a downstream processing plant, as well as from the closed system, for example, in the environment. Such drainage systems may also have interfaces via which they can carry out a drainage, that is to say a removal of the wastewater, in the port into the sewers present there. Similar systems are also used for land installations. Due to the structural design of vessels, the ship's bottom inevitably forms the lowest point, whereby the use of conventional drainage systems is only possible to a limited extent. Furthermore, the movement of the watercraft makes the use of conventional drainage systems more difficult. For this reason, vacuum drainage systems are typically used to drain watercraft.

In known drainage systems, it should be noted that the fluid to be pumped, that is to say the wastewater, is a fluid in which a large number of very different solids can occur. This has the consequence that only very robust pumps must be used and in particular a vacuum drainage, as used for example in aircraft toilets, is difficult to carry out. Filigree pumps involve the risk of being damaged by solids in the wastewater and becoming clogged or even completely precipitated.

The currently used pump devices for operating vacuum drainage systems on watercraft require a relatively large amount of space, can sometimes be difficult to adapt to changing circumstances and are prone to blockages. Furthermore, some of them have a high weight and are difficult to install in smaller and medium size craft. In addition, they usually do not have integrated cutting devices for treating the wastewater for downstream treatment processes.

The object of the present invention is to provide a pump device which overcomes the above-described disadvantages of known pump devices. In particular, it is an object of the present invention to provide a pumping device with the aid of which a vacuum drainage system can be operated in a light and cost-effective and moreover compact design. The above object is achieved by a pumping device having the features of independent claim 1. Advantageous embodiments are u. a. from the subclaims appended to the independent claim.

Further, the present object is achieved by a dewatering apparatus having the features of independent claim 14. A pump device according to the invention for operating vacuum drainage systems and for conveying sewage, in particular on water vehicles, has at least one drive device. This drive device is equipped with a drive shaft which has a first shaft end and a second shaft end and is rotatable by means of the drive device. The drive device may be, for example, a motor, in particular an electric motor. Such a motor can be in driving connection with the drive shaft, in particular, use it in one piece as the output shaft of the engine power of the drive device. Of course, the drive device may also have gear stages in order to achieve an adjustment of the torque, or the rotational speed, or be executed with a directly constructed frequency converter, which also controls the speed.

Further, in a pumping device according to the invention, a centrifugal pump is provided with at least one impeller. This at least one impeller is connected torque-tight to the drive shaft in the region of the first shaft end. This means that directly at the first end of the shaft or in its immediate vicinity, the impeller is torque-tight connected to the drive shaft. A torque-resistant connection, for example, by a press fit, ie z. B. be made by shrinking the impeller on the drive shaft. Other torque transmissions, such as a tongue and groove connection between impeller of the centrifugal pump and drive shaft are conceivable within the scope of the present invention.

In addition, in a pump device according to the invention, a vacuum pump with at least one rotor is present. In the area of the second shaft end, the rotor is connected to the drive shaft so that it is torque-proof. In other words, therefore, the rotor is located at the opposite end of the drive shaft with respect to the impeller of the centrifugal pump. The rotor of the vacuum pump is torque-tight connected to the drive shaft. Again, a connection z. B. via a press fit by shrinking or via a tongue and groove connection can be generated.

The arrangement of the impeller and the rotor in the region of the respective shaft end of the drive shaft is understood to mean that the rotor and impeller are opposite with respect to the shaft ends of the drive shaft. In this case, impeller and rotor at the actual end of the drive shaft or even spaced therefrom on the drive shaft ange- orders be. An arrangement of rotor and impeller together on a shaft side is also conceivable accordingly.

In a device according to the invention, it is possible that the drive shaft is made in one piece or else in several pieces. In particular, it is conceivable that a separate component of the drive shaft is provided for the impeller of the centrifugal pump and / or the rotor of the vacuum pump, which is connected in torque-locking connection with the rest of the drive shaft, which can also serve as the output shaft of the electric motor. The drive shaft is thus composed of individual drive shaft parts via torque couplings. Such an embodiment has the advantage that standard electric motors can be used. Such standard electric motors, which provide their driving force on two sides of the engine via an output shaft, can therefore be used inexpensively for the manufacture of a device according to the invention.

A decisive advantage of the pump device according to the invention is that the centrifugal pump, as well as the vacuum pump, can be driven by one and the same drive device. It is therefore on the one hand no additional drive for the vacuum pump necessary, on the other hand, no separate control. In other words, the control or regulation of both pumps of the pumping device is simplified in that only a single drive must be provided and regulated.

Another advantage of a pump device according to the invention is that a particularly compact construction can be achieved. By arranging the vacuum pump, in particular its rotor, and the centrifugal pump, in particular its impeller, to each other, the necessary construction volume of the pumping device is only slightly increased over the construction volume of the drive device. As it were, the corresponding pump is attached to both sides of the drive device, so that the entire construction volume essentially extends the overall volume of the drive device. A housing of the respective pump can advantageously correlate with the housing of the drive device and in particular be attached to this. The overall system of the pumping device can be produced particularly compactly in this way. Existing recordings for pumping devices in existing drainage systems can be equipped in this way with a pump device according to the invention, without structural changes must be performed. Each of the two pumps has corresponding connections for connection to a drainage system. Thus, the vacuum pump of the pump device according to the invention is designed with a connection on the suction side and a connection on the pressure side. The connection to the pressure side can advantageously be made short in order to serve directly as a vent of the vacuum pump. In order to ensure that no backlash can occur in the system of the vacuum pump, the outlet on the discharge side or the inlet on the suction side of the vacuum pump can be secured with a pressure relief valve (check valve), which only a direction of movement of the pumped fluid from the vacuum pump out possible. The use of a check valve in front of or behind the vacuum pump also ensures that the piping system is not ventilated when the pumping device is at a standstill.

The connection on the suction side can be connected directly or indirectly to the drainage system. In particular, an indirect connection via a buffer memory allows a particularly advantageous support of the drainage by means of the generated vacuum. Depending on the design of the drainage system, the connections of the vacuum pump may possibly be provided with adapters to suit the appropriate thread type or flange connection of the drainage system. The centrifugal pump is also provided with at least two connections. On the one hand, it has a connection on its pressure side, which can forward the pumped wastewater. The forwarding can be done in a connected channel system, a treatment plant, as well as in a collection tank or from a drainage system to the environment. The connection of the pressure side of the centrifugal pump can therefore also be understood as the output from the drainage system for the wastewater. An additional check valve, which can be placed above the discharge nozzle, prevents the piping system from being vented through the centrifugal pump.

The circular pump also has a connection on the suction side, via which wastewater can be sucked into the centrifugal pump. The suction side of the centrifugal pump can represent direct or indirect connection to a drainage system according to different embodiments of the present invention, which is to be operated with a pumping device according to the invention. An indirect connection of the centrifugal pump is particularly useful in the design of the suction-side connection of the vacuum pump via a buffer storage. In such an embodiment, the terminal is the Suction side of the centrifugal pump on the buffer below the connection of the suction side of the vacuum pump and promotes wastewater contained in the buffer memory. The buffer memory is used to separate the air-wastewater mixture and ensures that no wastewater is sucked in by the vacuum pump. The wastewater in the buffer memory itself serves as a decoupling fluid for the vacuum, which is generated above the wastewater in the buffer memory by the vacuum pump. In the regulation of the pumping device, it is therefore advantageously ensured that the level of the wastewater in the buffer reservoir is above the suction-side connection of the centrifugal pump and below the suction-side connection of the vacuum pump. The use of the check valve on the pressure port of the centrifugal pumps prevents the buffer tank from being ventilated by the centrifugal pump. Therefore, in such a system, the buffer tank may also be completely emptied.

As a result of the above-described connections of the vacuum pump and the centrifugal pump, in a direct as well as indirect manner via a buffer reservoir, the fluid interfaces of the pumping device thus form the drainage system.

It may be advantageous if, in a pumping device according to the invention, a cutting device with at least one rotatable cutting means is present, which is connected torque-tight in the region of the first shaft end and upstream of the impeller to the drive shaft. The cutting device thus serves to contact the wastewater before it enters the centrifugal pump. The rotating cutting means is also torque-tight connected to the drive shaft, so that it rotates together with this. In summary, it can be said that in such an embodiment, both the rotatable cutting means, as well as the impeller of the centrifugal pump, as well as the rotor of the vacuum pump, rotate together with the substantially identical speed. Of course, it is conceivable that in the event that different speeds are preferred, between the drive device and the centrifugal pump and / or between the drive device and the vacuum pump, a transmission is provided, which, for example as a planetary gear or as a star wheel gear a torque change and thus a Drehzahlver - Change possible. It is also possible to achieve a deflection of the torque via such transmissions, for example for the reversible operation of the cutting means for the purpose of cleaning.

A cutting device according to the invention is advantageous, since in this way the waste water can be pretreated before it continues into the pumping device, in particular into the running device. Rad the centrifugal pump arrives. This mechanical pre-treatment by the cutter is used to crush solids that float in the fluid phase of the wastewater. The comminution has the advantage that the subsequent pipe diameter, as well as the design of the centrifugal pump can be done on the crushed particles. Accordingly, smaller pipe diameters and also a more compact design of the centrifugal pump are possible, without having to put up with unnecessarily frequent clogging of the centrifugal pump as well as the subsequent pipelines. The cutting device thus serves to break up the solids as well as to filter the solids. Furthermore, the comminution of the ingredients results in a treatment of the wastewater for the downstream treatment processes. In particular, it is ensured by the cutting device that no solids above a certain particle size enter the impeller of the centrifugal pump. Such solids may be, for example, organic wastes or residual waste parts such as plastic films, plastic parts or the like when using the pumping device for drainage systems on watercraft. The type and size of the solids is variable depending on the use situation of the drainage system, so that the cutting device is advantageously designed for a maximum load with such solids.

In a pumping device according to the invention, it may be advantageous if the cutting device is at least one rotatable cutting means in the form of a rotatable cutting blade. A rotatable cutting blade may, for example, be associated radially afterwards with the drive shaft, wherein the cutting edges of the cutting blade advantageously extend away from the drive shaft along the radial direction so that solid particles located in the central region of the wastewater stream are mechanically processed by the cutting blade. For example, the rotatable cutting blade can also be arranged directly on the first shaft end of the drive shaft, ie on the stub shaft on this first shaft end. In this way, the rotatable cutting blade is preceded by the drive shaft so to speak, so that radial construction volume can be saved. In addition, it is advantageously possible that, in a pumping device according to the invention, the cutting device has at least one rotatable cutting means in the form of a rotating cutting ring. Such a cutting ring can be arranged, for example, outside a rotatable cutting blade relative to the radial direction of the drive shaft. The cutting ring allows the wastewater stream to pass through the cutting device while mechanically processing the solids in the wastewater stream. Also the rotatable Sc enidring acts in addition to its cutting function as a filter for the maximum permitted size of the solids after the cutting device. The cutting device is thus in particular able to mechanically process solid particles in the wastewater stream, which are present in the radial outer region in the flow. It is also possible that the cutting blade allows no direct Durchläse, but the Durchläse for the waste water flow is possible only under the passage of the rotatable cutting ring. Thus, it is possible in this way that the cutting blade is a pretreatment and the cutting ring is a post-treatment of the wastewater. In a combination of a rotatable cutting blade and a rotatable cutting ring with each other, the rotatable cutting knife is advantageously preceded by the rotatable cutting ring in the axial direction of the drive shaft with respect to the flow direction of the wastewater. In this way, the cutting blade can be understood as a first stage of the mechanical processing of the wastewater and the cutting ring as a second stage of this mechanical processing. The cutting blade can thus serve to crush the coarsest solids so far that they do not hinder the cutting ring in its mechanical processing, this particular clog.

By using a cutting device according to the invention may be advantageous if it is designed such that passing material is crushed to a particle size of less than or equal to 4 mm to 8 mm. In particular, while the cutting ring, as already described above, designed as a second stage of mechanical machining and interchangeable, so in modular design by selecting a corresponding cutting ring a maximum grain size for the material to be passed, so the solid particles in the waste stream of smaller or equal to 4 mm or less than or equal to 8 mm is adjustable. Depending on the selected cutting ring, the subsequent dimensioning of the piping can then be designed. On the other hand, it is also possible that with already existing piping, with known diameter of an existing drainage system via the cutting ring a corresponding adaptation of a pumping device according to the invention to the existing drainage system takes place. Due to the modular design of the cutting device is ensured in this way that particularly cost such flexible use is possible. Of course, the rotatable cutting blade can be made interchangeable. In particular, in this way, a cutting blade can be used in the pumping device, which is adapted to the fixed stationary cutting ring used. The flexibility of a pumping device according to the invention is further increased by such a configuration. It may also be advantageous if in a pumping device according to the invention, the vacuum pump is designed as a rotary vane pump. In such a rotary vane pump, the rotor of the vacuum pump is provided with rotary valves, which are mounted as a slide in the radial direction of the rotor movable in this. In addition, there are spring elements in the rotor, which press the respective rotary valve radially outwards. The rotor itself and thus also the drive shaft of the drive device, on which the rotor is fixed torque-fixed, are arranged eccentrically in the housing of the vacuum pump. In this way, the pins of the vacuum pump, in particular the rotor, move radially outwardly and inwardly as they move along the housing of the vacuum pump. By the rotation and by the radial movement of the pins resulting variation of the pump chambers defined by the pins, the vacuum pump is operated and achieved a promotion of gas. In such an embodiment, a check valve is advantageously provided, which prevents oil return from the vacuum pump. In particular, contamination of the wastewater in the drainage system is to be protected against such contamination. An oil circulation lubrication takes place via an oil separator and an oil tank, whereby the separated oil is automatically returned to the vacuum pump. A gas ballast valve serves to prevent smaller amounts of steam, which have been sucked into the vacuum pump from the suction side, from condensing on the rotor or at other locations inside the pump.

The use of a rotary vane pump in a pump device according to the invention has the advantage that it is particularly cost-executable and beyond their operation includes a relatively small loss of torque. It is possible that the vacuum pump in a pump device according to the invention directly, in particular without gear, is coupled to the drive device. The vacuum pump, in particular the rotor thus rotates in such an embodiment with the same speed, as well as the impeller of the centrifugal pump.

It is also advantageous if, in a pumping device according to the invention, the rotor of the vacuum pump is connected in a torque-tight manner in the region of the second shaft end to the drive shaft via a switchable coupling. Such a coupling can of course also be connected between the connection of the impeller of the circular pump with the first shaft end of the pump. be present drive shaft. The use of a coupling for the torque-fixed connection between the rotor of the vacuum pump and / or impeller of the centrifugal pump has the advantage that the respective pump can be actively selected via the switchable coupling or off or on. If only the support of one of the two pumps is desired in the use of a pump device according to the invention, this is readily possible by switching the corresponding clutch. Such couplings can be connected, for example, electromechanically or pneumatically. Hand-operated clutches, which are operated purely mechanically, are conceivable within the scope of the present invention. In particular, by providing a coupling for the vacuum pump so the pump device according to the invention can be used in the classic mode, ie exclusively with a centrifugal pump. For special applications, the vacuum pump can be switched on via the coupling, without any structural intervention in the pumping device would be necessary. Another advantage is when, in a pumping device according to the invention, the vacuum pump is provided on its suction side with a filter. This filter is designed such that solids do not reach the particle size of more than one mm into the vacuum pump. Such a filter may, for example, be equipped with a mesh whose mesh size determines the maximum diameter of particles that can pass through this filter. In this way it is ensured that the vacuum pump is protected from damage by such solids. This is advantageous in particular when using the vacuum pump in the pumping device according to the invention, since it is not foreseeable which type of solids are in the fluid to be delivered, ie in the wastewater. By using a filter, on the one hand, the desired negative pressure performance can be made available on the suction side of the vacuum pump; on the other hand, the vacuum pump itself, in particular its rotor, can be adequately protected by damage by the solids. Advantageously, the filter is further designed to prevent penetration of the same into the vacuum pump not only against solids but also against liquids. In particular, in a direct connection of the vacuum pump to a drainage system, such an embodiment is advantageous.

Furthermore, the upstream connection of a condensate separator is possible in order to prevent water droplets or condensate from the suction line from entering the vacuum pump. Furthermore, it is advantageous if, in a pumping device according to the invention, the pumping device is connected on its pressure side to a collection tank. This is advantageous in particular when pumping devices according to the invention are used on vessels, since dewatering, that is to say discharge of the wastewater to the environment, in particular to the surrounding water, is frequently not desired or even prohibited by law. For such situations, a holding tank may be used which collects the waste water for operation in the sealed system and is emptied again at a time when the system is again connected to the sewer, for example when the vessel is in a harbor. The collecting tank thus offers the possibility of using a pumping device according to the invention to operate a drainage system on a watercraft as a substantially closed system, at least temporarily. It is advantageous if, when using a collecting tank, the centrifugal pump is connected to the collection tank such that the centrifugal pump can be operated in both directions. Through a corresponding piping and multiple connections to the pressure side and suction side of the centrifugal pump can be used in this way, the centrifugal pump not only for drainage into the collection tank, but also for its emptying into a correspondingly connected sewer, from the collection tank out. This multiple functionality, or multiple use of the centrifugal pump of the pumping device simplifies the construction of the system and also reduces the cost of a pump device according to the invention.

A further advantage is when, in a pumping device according to the invention, a cleaning opening is arranged on the suction side of the pumping device, which is reversibly closed by a cleaning opening cover. In particular, due to the fact that the fluid to be pumped is a wastewater in which solids may be present whose type, shape and size are unpredictable, such a cleaning opening is of great advantage. By the reversible closure with a Putzöffnungsdeckel an inspection of the region of the suction side of the pumping device, ie in particular the suction side of the centrifugal pump and / or the suction side of the vacuum pump can be performed by this cleaning opening. If an inspection of both the centrifugal pump, as well as the vacuum pump is desired, it is advantageous if appropriate cleaning openings are provided directly in front of each of the two pumps. In particular, a cleaning opening in the region of the suction side of the centrifugal pump makes sense, when using a cutting device before this. In the event of clogging of the centrifugal pump or damaging of the cutting device by solids in the wastewater to be pumped, access to the blocking solids or to the cutting device for exchanging the same or a part thereof can be achieved in a particularly simple manner. be possible. In this way, the maintenance of a pump device according to the invention is simplified and thus significantly reduces the costs incurred in blockages of the circular pump or the cutting device. Also, the downtime for damage is reduced by the possibility of accelerated repair through the plaster opening.

It is also advantageous if, in a pumping device according to the invention, a buffer store is provided which is held under vacuum by means of the vacuum pump, from which wastewater can be pumped out by means of the centrifugal pump. The buffer thus separates a vacuum circuit from a waste water circuit, so that the vacuum pump keeps the buffer memory under negative pressure, with a low probability that the vacuum pump would be affected by inflowing wastewater. The buffer memory with the negative pressure generated therein is in turn on its connection side in contact with the drainage system. If wastewater to be drained is obtained in the drainage system, this is sucked into it by the negative pressure in the buffer tank. A gradient within the drainage system is not necessary because the negative pressure sufficient to suck the corresponding wastewater in the buffer memory. From a certain filling level in the buffer tank, the wastewater contained therein is pumped out. The centrifugal pump is used for this purpose. The connection of the suction side of the centrifugal pump is therefore advantageously based on the level in the interior of the buffer memory below the connection of the vacuum pump on the suction side. In this way, advantageously, the suction side of the centrifugal pump is constantly below the water level, while the suction side of the connection of the vacuum pump is always above the level in the buffer memory. Now, if the buffer memory emptied, the centrifugal pump and in particular the cutting device is used. In such an embodiment, it is advantageous if one or the other pump can be selected by means of a coupling between the vacuum pump and the drive device or a coupling between the centrifugal pump and the drive device. From the centrifugal pump, the wastewater is either pumped out of the buffer tank into a collection tank, into a sewage system, or disposed of into the environment.

Another object of the present invention is a dewatering device on a watercraft, which has a pump device according to the invention. Using a pumping device according to the invention for a dewatering device on a water serfahrzeug has the above-explained advantages of a pump device according to the invention.

The present invention will be explained in more detail with reference to the accompanying drawing figures. The terms "left", "right", "top" and "bottom" used in this case refer to an alignment of the drawing figures with normally readable reference numerals. Show it:

Fig. 1 is a schematic cross-sectional view of an embodiment of the present invention

FIG. 2 A schematic representation of a flow chart of an embodiment of the present invention. FIG

Fig. 3 Schematic representation of another embodiment of the present invention

Fig. 4 The schematic representation of a further embodiment of the present invention.

In Fig. 1, the particularly compact design of a pump device 10 of the present invention can be seen well. The pump device 10 according to the invention has as its central component a drive device 20. This drive device 20 is formed in this embodiment, for example, as an electric motor. The output shaft of the electric motor of the drive device 20 simultaneously forms the drive shaft 22 of the pump device 10, so that the drive device provides the torque required for the operation of the pump device 10.

The drive shaft 22 of the drive device 20 protrudes on both sides of the drive device 20 out of this. In this way, the two shaft ends 22a are visible as the first shaft end and 22b as the second shaft end and are available for the torque provided by the drive device 22 available at these two shaft ends 22a and 22b. At the first shaft end 22a of the drive shaft 22, the impeller 32 of a centrifugal pump 30 is disposed in the region thereof and is connected to the drive shaft 22 in a torque-tight manner. Also in the region of the first shaft end 22a of the drive shaft 22 is a

Cutting device 50 torque-fixed to the drive shaft 22 is connected. Transfer one the drive shaft 20 is a torque, so rotate both the impeller 32 of the centrifugal pump 30, as well as the cutting device 50 and the rotor 42 of the vacuum pump 40th

The cutting device 50 has a rotatable cutting blade 52, which is divided into a rotatable cutting blade 52a and a stationary cutting ring 52b. The stationary cutting ring 52b is located outside of the rotatable cutting blade 52a, based on the radial direction, and behind the rotatable cutting blade 52a, based on the axial direction of the drive shaft 22. By selecting a corresponding cutting ring 52b, the maximum value for the transmitted grain sizes be adjusted by solid particles.

Furthermore, a cleaning opening 12 is provided upstream of the cutting device 50. This cleaning opening 12 is closed with a Putzöffnungsdeckel 14 which is reversibly closed. If now a blockage or a reduced output of the centrifugal pump 30 is detected, an inspection of the centrifugal pump 30 as well as of the cutting device 50 can take place via the cleaning opening 12. If it is determined during this inspection that solids have settled in this area, then they can be removed without problems via the cleaning opening 12, so that the further operation of the cutting device 50, as well as the centrifugal pump 30 is ensured. Between the centrifugal pump and the drive device is a dry run protection 31 for protecting the mechanical seal in the event of dry running of the centrifugal pump.

At the second shaft end 22b of the drive shaft 22, the rotor 42 of a vacuum pump 40 is predetermined. As can be seen schematically in FIG. 1, the vacuum pump 40 is preferably a rotary vane pump, wherein the rotor 42 is arranged eccentrically in the housing of the vacuum pump 40. Not shown further are the individual features of the rotor 42, in particular the necessary rotary valve and the spring elements for moving the respective rotary valve in the radial direction and their application to the housing of the vacuum pump 40. The rotor 42 is torque-fixed to the drive shaft 22, so that itself In the embodiment of FIG. 1, the rotor 42, the cutting device 50 and the impeller 32 of the centrifugal pump 30 all rotate at the same speed of the drive device 20. For controlling. Respectively, the regulation of the pumping device 10 of the present invention, therefore, only a signal and a power supply for the drive device 20 is necessary, which in the same way with the same speed all three components, namely the rotor 42 of the vacuum pump 40, the impeller 32 of the centrifugal pump 30 and also the cutting means 52 of the cutting device 50 drives.

FIG. 2 schematically shows a flowchart that uses a pumping device 10 according to the invention. With dashed lines, the drive shaft 22 is shown here according to their functionality. A drive device 20, also embodied here as a motor, in particular as an electric motor, stands in this case via the drive shaft 22 both with the vacuum pump 40 and with the centrifugal pump 30 and the cutting device 50 in a torque-transmitting connection. In other words, the drive device 20 drives all three components, ie cutting device 50, centrifugal pump 30 and vacuum pump 40 together. The centrifugal pump 30 and the cutting device 50 are arranged in the region of a first shaft end 22a and the vacuum pump 40 at an opposite second shaft end 22b of the drive shaft 22. In this case, the pumping device 10 may be embodied, for example, as shown in FIG.

By means of the vacuum pump 40, a negative pressure in the connected piping system is generated until a stable negative pressure is reached. After reaching the desired negative pressure in the piping system, the pump device switches off and the system is ready for use. Through the discharge points (toilets, showers and drains) an air-waste water mixture LU / AB is intervened in the pipeline system, which collects in front of the suction opening of the centrifugal pump. If the water level in front of the centrifugal pump has reached a previously defined level or the system vacuum is insufficient to operate it constantly, the pumping device will switch on again. The wastewater in front of the centrifugal pump is crushed and discharged, and the injected air is removed by the vacuum pump until a stable negative pressure has again been established in order to safely operate the connected vacuum drainage system. Further, the vacuum pump 40, a filter 46 and a Kondensatabscheider 45 are connected upstream, which prevent solid particles, water droplets or condensate from a certain size, in particular greater than 1 mm, can get into the vacuum pump 40.

In order to be able to drive the vacuum pump 40 in a targeted manner or to be able to deactivate it in a targeted manner, a coupling 44b is provided in the drive shaft 22. Via the coupling 44b, it is possible to turn on or off the torque transmission from the drive device 20 to the vacuum pump 40. Thus, the vacuum pump 40 is switchable, whereby the flexibility of an insert of a pump device 10 according to the invention even further elevated. Furthermore, there is a coupling 44a in the drive shaft 22 between the drive and centrifugal pumps.

Fig. 3 shows a variation of the embodiment of Fig. 2. The components having the same effect used therein have the same reference numerals, and therefore a detailed description thereof will be omitted. Rather, only the differences between the two embodiments will be explained below.

In contrast to FIG. 2, a plurality of differences in the embodiment of FIG. 3 can be recognized. First, the promotion of the wastewater AB does not take place to the environment or a connected sewer, but rather a collection tank 60 is provided, in which the promotion takes place. The collection tank 60 is dimensioned such that at least temporarily an isolated operation of the pumping device 10 can be used in a drainage system. In this case, the collection tank may already be an existing component of an existing drainage system, to which the pumping device 10 according to the invention is connected.

4, a further embodiment of a pumping device according to the invention is shown schematically. Again, the same reference numerals are used for the same components, which is why an explanation thereof is not repeated here.

In contrast to the embodiments of FIGS. 2 and 3, a buffer memory 70 is provided in this embodiment of FIG. 4. The buffer 70 communicates with the drainage system and can be obtained from this waste water AB. In order to obtain the wastewater from the dewatering system, a negative pressure is generated in the buffer memory 70. This negative pressure is produced via the vacuum pump 40, which is driven via the drive device 20, in particular via the drive shaft 22. In other words, the buffer tank 70 is constantly kept under negative pressure, so that in the case of accumulation of waste water in the drainage system, the same can be fed into the buffer tank 70 by the negative pressure promoted. A slope for the promotion of the waste water AB is not necessary in this embodiment. In the buffer memory 70, therefore, a level of wastewater will set, which is advantageously below the connection on the suction side of the vacuum pump 40. If the level in the buffer memory 70 increases over time, a discharge from the buffer memory 70 will be necessary at a certain level. If the pumping device switches on, the centrifugal pump 30 is driven via the drive device 20, in particular its drive shaft 22, then the wastewater is discharged from the buffer reservoir 70. The discharge of the wastewater AB can be either to the environment or to a connected sewage system , or in a storage container as known from the embodiment of Fig. 3 happen.

Also in this embodiment, a cutting device 50 is advantageously provided, which is arranged upstream of the centrifugal pump 30. The comminution thus takes place only during the removal from the buffer memory 70, so that there is still undecorated material in the buffer memory 70. This can be used, for example, that coarse suspended solids settle during the stay in the buffer and can not get into the subsequent cycle. The buffer 70 may be used as the first coarse clarification stage in such an embodiment. It goes without saying that the above-described embodiments are only examples. Of course, these examples can be freely combined with each other, so that individual components can be put together to form a new embodiment, if this makes sense technically. All of the claims, the description and the drawings resulting features and advantages, including design details, spatial arrangements and method steps may be essential to the invention both in itself and in various combinations.

Reference numeral

10 pumping device 70 buffer memory

12 plaster opening

14 Putzöffnungsdeckel AB wastewater

20 drive device LU air

22 Drive shaft AB / LU Waste water / air mixture

22a first shaft end

22b second shaft end

30 centrifugal pump

31 Dry running protection

32 impeller

vacuum pump

42 rotor

44a clutch

44b clutch

45 condensate separator

46 filters

50 cutting device

52 rotatable cutting means

52a rotatable cutting blade

fixed cutting ring

60 collection tank

Claims

claims

1 . Pumping device (10) for operating vacuum drainage systems and for conveying sewage, in particular on water vehicles, comprising a drive device (20) with a drive shaft (22) having a first shaft end (22a) and a second shaft end (22b) and by means of the drive device (20) is rotatable, a centrifugal pump (30) with at least one impeller (32) which in the region of the first shaft end (22a) torque-tight to the drive shaft (22) is connected, and a vacuum pump (40) with at least one rotor (42 ), which in the region of the second shaft end (22b) torque-fixed to the drive shaft (22) is connected.

2. Pump device (10) according to claim 1, characterized in that a cutting device (50) with at least one rotatable cutting means (52) is present, the torque fixed in the region of the first shaft end (22a) upstream of the impeller (32) with the drive shaft (50). 22) is connected.

3. Pump device (10) according to claim 2, characterized in that the cutting device (50) at least one rotatable cutting means (52) in the form of a rotatable

Cutting knife (52a) has.

4. Pumping device (10) according to any one of claims 2 or 3, characterized in that the cutting device (50) has at least one rotatable cutting means (52) in the form of a rotating cutting ring (52b).

5. Pumping device (10) according to one of claims 2 to 4, characterized in that the cutting device (50) is designed to crush these passing material to a particle size of less than or equal to 4 mm to 8 mm.

6. Pumping device (10) according to one of the preceding claims, characterized in that the vacuum pump (40) is designed as a rotary vane pump or liquid ring vacuum pump.

7. Pumping device (10) according to one of the preceding claims, characterized in that the rotor (42) of the vacuum pump (40) and / or the impeller (32) via switchable couplings (44a and 44b) in the region of the shaft ends (22a, 22b ) are connected to the drive shaft (22).

8. Pumping device (10) according to one of the preceding claims, characterized in that the vacuum pump (40) is provided on its suction side with a filter (46) which prevents solids with a grain size of greater than 1 mm from entering the vacuum pump ( 40).

9. Pumping device (10) according to one of the preceding claims, characterized in that the vacuum pump (40) is provided on its suction side with a Kondensatabscheider (45), which prevents sucked water droplets or condensate from the suction line and the upstream buffer memory (70 ) can get into the vacuum pump (40).

10. Pumping device (10) according to any one of the preceding claims, characterized in that the pumping device (10) communicates on its pressure side with a collecting tank (60).

1 1. Pumping device (10) according to one of the preceding claims, characterized in that on the suction side of the pumping device (10) a cleaning opening (12) is arranged, which is reversibly closed with a Putzöffnungsdeckel (14).

12. Pump device according to one of the preceding claims, characterized in that a buffer memory (70) is provided, which is held by means of the vacuum pump (40) under negative pressure, and from which with the aid of the centrifugal pump (30) wastewater can be pumped out.

13. Pumping device (10) according to one of the preceding claims, characterized in that the centrifugal pump (30) is provided with a dry running protection, which protects the mechanical seal of the centrifugal pump (30) in a dry run.

14. A drainage device on a watercraft, comprising a pump device (10) with the features of one of claims 1 to 13.