JP6101363B2 - Multiple pump - Google Patents

Description

  The present invention relates to an eccentric screw pump.

  Eccentric screw pumps are used in different fields such as agriculture, chemical industry, food industry and paper industry. Such an eccentric screw pump belongs to a rotary positive displacement pump group, and mainly includes a rotor and a stator in addition to a drive device. Screw-type rotors in eccentric screw pumps are characterized by large leads, large pitch depths and small core diameters. The stator not only has one screw portion with respect to the rotor, but also has a lead length twice that of the rotor. As a result, a conveyance space that continuously moves toward the inlet side or the outlet side is formed between the stator and the rotor, and the conveyance medium is carried in the conveyance space.

  The rotor of an eccentric screw pump is usually made of a wear resistant material, such as steel. On the other hand, the stator is usually made of an elastic material such as rubber. However, in the prior art, stators made of metal and / or plastic materials or composite materials are known.

  The individual components in the eccentric screw pump are sized and configured appropriately for a given transfer task. For example, the conveying speed and the achievable pressure depend on the dimensions and configuration of the stator and rotor. Therefore, for example, even when two eccentric screw pumps having completely different applications are used, the drive device can have the same design and configuration. In particular, in an eccentric screw pump, different conveyance amounts and pressures can be obtained at the same speed in the rotor. If the demands on the eccentric screw pump have changed, i.e. if, for example, the conveying speed to be achieved has increased and the pump is no longer suitable for this purpose, the method can be replaced by replacing the eccentric screw pump. Absent. This is because the modification is basically excessive in terms of cost.

  For example, Patent Document 1 (US Pat. No. 2,483,370) discloses an eccentric screw pump having a plurality of cylinders. These cylinders are firmly arranged in the housing, and a rotor gear is arranged in the housing. The advantage here is that the pump, by virtue of its configuration, requires only a single seal. This pump has only one outlet (exhaust port 29) and therefore the pressure cannot be different for all transport modules. Since the transfer module is affected by the eccentricity to be compensated by the internal gear, not only the transfer amount is restricted, but also the pump is highly worn. The pump of Patent Document 1 has only one inlet for only one transport medium (inlet port 28), and due to its compact design and special drive configuration, the transport module is relatively expensive. Can only be exchanged as a pair.

  In addition, US Pat. No. 5,820,354 discloses an eccentric screw pump comprising at least two pump stages connected in series. In this case, the volume flow rate from the second pump is smaller than the volume flow rate from the first pump. In this embodiment, the conveyance medium can be compensated by cooling the conveyance medium by a cooling unit (cooling system 55) arranged between the pump stages. In this case, the volume of the transport medium is reduced due to the cooling effect on the transport medium, and a smaller pump stage can be arranged on the downstream side. The transport direction and hence the inlet and outlet for the transport medium in the pump cannot be changed.

  In addition, the eccentric screw pump described in Patent Document 3 (International Publication No. 2009/038473 pamphlet) includes two pump parts (Pa, Pb). In this case, at least one inner pump rotor is surrounded by at least one outer pump rotor. These pump parts (Pa, Pb) are driven at different rotational speeds in the rotor. This pump comprises an inlet (inlet flange 21) and an outlet (outlet flange 28) for transporting liquid.

U.S. Pat.No. 2,483,370 U.S. Pat.No. 5,820,354 International Publication No. 2009/038473 Pamphlet

  In spite of the previously known pumps described above, it is desirable to provide a pump that can be easily and inexpensively adapted to a given transport task. Furthermore, it is desirable for this pump to allow simultaneous transport of different products without the need for multiple and individual pumps or pumping equipment. In addition to this, it is desirable that the load applied to the components of the pump used for conveyance is not substantially increased as compared with a conventionally known screw eccentric pump.

  Known eccentric screw pumps cannot completely satisfy the above points.

  In view of the circumstances described above, it is an object of the present invention to enable an increase in transport speed, increase pressure, and / or simultaneously transport two or more transport media as needed. Another object of the present invention is to provide an eccentric screw pump that consumes relatively little energy during operation of the eccentric screw pump and that is inexpensive to manufacture and maintain.

  According to the invention, this problem is solved by an eccentric screw pump comprising a modular conveying system. The eccentric screw pump comprises at least two transfer modules each including a rotor and a stator, the transfer modules being coupled together, and only a single drive is assigned to the transfer system, For the carrier medium, including two or more inlets and / or outlets, or including at least one modular flow-through housing.

  The transport module in this case is a rotor / stator assembly, and the transport medium is carried by the assembly. By using the eccentric screw pump and the two or more transfer modules according to the present invention, not only different products but also the same product can be simultaneously transferred from different sources. Furthermore, the pressure that can be obtained with the pump can be increased by connecting a plurality of transfer modules in series. For this purpose, the transport modules are coupled together so that they can be driven by only a single drive.

  The present invention is based on the idea that adaptation to a predetermined transport task can be realized particularly simply by means of a modular transport system. In this case, the number of inlets and outlets for the transport medium and the number of transport modules can basically be arbitrarily increased and combined. The modular system configured in this way makes it possible to effectively adapt the pump to the user's requirements.

  This is achieved by coupling at least two transport modules together. Each of these transfer modules includes a stator and a rotor, which are driven only by a single drive. For this purpose, the rotors are connected to one another in order to transmit the forces generated during the operation of the eccentric screw pump, in particular the torque by the drive. Preferably, the transport module is coupled 180 degrees out of phase between the pressure pulsation depending on the rotation angle and the vibrations caused by each rotor of the transport module. In this case, the vibration is reduced to a minimum because the frequency is the same due to the use of only a single drive system.

  Preferably, the transport modules are coupled to each other by a suction housing, a pressure housing or a flow-through housing. This has the advantage that the eccentric screw pump can be mounted differently depending on the conveying task. In this case, the suction housing and the pressure housing are provided with connection pieces for connection to the transport pipe. Thereby, the suction housing can be connected to the suction pipe, and the pressure housing can be connected to the pressure pipe.

  By appropriately selecting and combining the housings, it is possible to adapt or modify the eccentric screw pump at a relatively low cost, depending on the predetermined transfer task. The transport modules can optionally be coupled to each other by a pressure housing, a suction housing or a flow-through housing or their ends can be coupled to the pressure housing or the suction housing. Furthermore, since the configuration of the transport module can be made different, the transport speed can be made different even when the rotational speed of the rotor is the same. When different products are transported, a specific mixing ratio can be set in this way.

  Preferably, the rotors assigned to the transport module are coupled to each other by a rigid coupling in the housing, so that the force acting on the rotor by the drive can be transmitted without play and loss. In this case, the rotors can be coupled together by a conventionally known rigid coupling suitable for transmitting torque and axial force depending on the application. In this case, a tightly coupled joint, such as a welded joint, an adhesive joint or a solder joint, or a friction locking and / or conformable joint, such as a screw joint, a clamp joint or a pin joint. Can do. However, it goes without saying that the rotors can also be coupled to each other by joint joints.

  In a preferred embodiment, the rotors are detachably connected to each other. This not only facilitates assembly and disassembly of the transfer module, but also improves it. For this reason, it is possible to modify the eccentric screw pump according to the present invention according to the change of the transfer task.

  In other embodiments, the rotor is configured integrally with respect to at least two transport modules. In this configuration, since there is no coupling portion, it is particularly suitable for transporting, for example, a polishing medium or a dangerous medium. In assembly, the housing and stator are loaded from an integral rotor. In this particular embodiment, the stator is considered a transport module, even though the transport module performs its function with each rotor portion after assembly.

  The eccentric screw pump is preferably configured such that the axial force F acting in the direction of the drive is close to zero or at least reduced. This is achieved in each of the two transport modules by the rotor transporting the transport media in opposite directions with respect to each other at the same speed and the same direction of rotation. For this purpose, each two transport modules shall have opposite leads. For example, in the case of an eccentric screw pump including two transfer modules, one transfer module has a left-handed lead and the other transfer module has a right-handed lead. The axial forces generated for each transfer module during operation of the eccentric screw pump act in opposite directions with respect to each other and are almost completely offset from each other when the same type of transfer module is used. Homogeneous in this case means a specific embodiment and dimensions for the transport element, apart from different leads. As a result, the axial force generated on the drive side approaches zero, so that an expensive bearing element in a drive device consisting essentially of a pump housing with drive parts and connection pieces is changed to a cheaper bearing element, for example. Is possible. In this way, the overall load on the drive device is greatly reduced.

  In the eccentric screw pump according to the present invention, it is particularly preferable that the transfer modules are connected in series. Thereby, the transmission of torque from the drive device to the rotor is particularly easily maintained. For example, as described above, with this configuration, the rotor can be configured integrally. Thus, in this embodiment, it is sufficient to provide one rotor for all the conveying elements of the eccentric screw pump.

  In another preferred embodiment, two adjacent transport modules are coupled together by a flow-through housing and configured to transport in the same direction. For this purpose, the leads in the two transfer modules are the same, preferably left-handed leads. That is, in this case, the product is transported in one direction from the first transport module through the flow-through housing to the second transport module via the connection piece at the inlet of the pump housing. Since each transfer module functions as a pressure stage, the generated pressure can be increased by a plurality of transfer modules connected in series.

  Furthermore, it may be advantageous to connect two adjacent transport modules together by means of a suction housing or a pressure housing. In this case, the transport modules are configured to transport in opposite directions relative to each other. For this purpose, the leads in the two transfer modules are different. Thus, the eccentric screw pump can include a first transfer module having a left-handed lead and a second transfer module having a right-handed lead, the two modules being coupled together by a pressure housing. Thereby, a conveyance medium is conveyed toward a pressure housing by a conveyance module. In the second embodiment, the eccentric screw pump can include a first transfer module having a right-handed lead and a second transfer module having a left-handed lead, and these two transfer modules are connected to each other by a suction housing. Connected. Thereby, the transport medium is sucked in the opposite direction with respect to each other by the transport module.

  In an advantageous embodiment, the eccentric screw pump comprises only two transfer modules. In this case, even if only two transfer modules are used, the eccentric screw pump can still be made compact while being configured according to predetermined requirements for the transfer task.

  For example, an eccentric screw pump can be configured to achieve twice the conveying speed with the same pressure output at the same speed and in the same rotational direction as compared to known eccentric screw pumps. For this purpose, the first transport module coupled to the drive device has left-handed leads, and the second transport module connected in series has right-handed leads. These transfer modules are connected to each other by a pressure housing. In this case, the second transfer module has a suction housing at the end opposite to the pressure housing. Similar to the known eccentric screw pump, the conveying medium is sucked through the suction connection piece on the pump housing. However, in the eccentric screw pump according to the present invention, the transport medium is also passed through the suction connection piece on the suction housing. Sucked. That is, in the operating state of the pump, the transport medium is transported from two directions toward the pressure housing and flows out through the pressure connection piece on the pressure housing. Therefore, a different transport medium can be supplied. These conveyance media are merged, and the mixing ratio can be set by appropriately selecting a conveyance module.

  However, the eccentric screw pump according to the present invention can also be configured to obtain twice the pressure even at a conveyance speed of one time as in the known eccentric screw pump. For this purpose, the eccentric screw pump is provided with two conveying modules having the same lead, preferably a left-handed lead. These two transport modules are connected to each other by a flow-through housing. In this case, the second transfer module has a pressure housing at the end opposite to the once-through housing. In this embodiment, the transport medium is sucked through the suction connection piece of the pump housing, and transported toward the pressure housing provided with the pressure connection piece through the first transport module, the once-through housing, and the second transport module. Is done.

  In other embodiments, the eccentric screw pump comprises a total of four transfer modules. Thus, depending on the configuration, when compared with a conventionally known eccentric screw pump, four times the conveyance amount is achieved at the same pressure, or twice the conveyance amount is achieved at twice the pressure. .

  In order to achieve a quadruple transport amount, each two transport modules with different leads are coupled together by a pressure housing. Furthermore, the two pairs of transport modules thus configured are coupled to each other by a suction housing. A further suction housing is arranged at the end of the eccentric screw pump opposite to the drive device. In this way, the transport medium can be transported by a total of three suction connection pieces and two pressure connection pieces. Preferably, the transport module has a left-handed / right-handed / left-handed / right-handed lead with respect to the first to fourth transport modules.

  In addition to the preferred embodiment of the eccentric screw pump, i.e. the embodiment in which a total of four modules are provided and the pump system comprises two suction housings and two pressure housings, in a further preferred embodiment: The transport module is connected to one another by one suction housing, two once-through housings and one pressure housing. In this case, each two transport modules having the same lead are connected to each other by a cross-flow housing. Furthermore, the pair of two transport modules configured in this way are connected to each other by means of a pressure housing. A suction housing is arranged at the end of the eccentric screw pump opposite to the drive device. Preferably, the transport module has a left-handed / left-handed / right-handed / right-handed lead.

  Preferably, in the coupling area of the transport module, the eccentric screw pump comprises mixing means coupled to the rotor. Thereby, a conveyance medium can be mixed at the time of conveyance. This is the case when two different products are introduced into the eccentric screw pump, for example when one product is introduced via the first suction housing and the other product is introduced via the second suction housing. Is particularly advantageous. In order to mix the product particularly effectively, the mixing means are arranged in the pressure housing and are directly coupled to the rotor. Therefore, a separate driving unit is not necessary.

  According to a preferred embodiment, each housing is configured substantially identically. In particular, the suction housing and the pressure housing are identical and are defined only by the nature of the application. On the other hand, the cross-flow housing is preferably constituted by a suction housing or a pressure housing. In this case, the suction connection piece or the pressure connection piece is provided with a closing means. This closing means can be configured, for example, as a blank flange that is fixed to the housing connection piece by means of a flange connection.

  The advantage realized by the present invention is in particular that different transport media can be transported at a predetermined mixing ratio by only one pump system. In this case, the pump system can be particularly easily adapted to the transport task, depending on the number and selection of transport modules and coupling means. Since the conveyance amount and conveyance speed in the eccentric screw pump are determined and influenced by various factors such as the shape and leads of the rotor and stator, the conveyance amount is particularly easily adjusted by adopting a modular pump configuration. can do. The mixing ratio of the transport medium can be changed by using transport modules having different transport speeds. Furthermore, cost savings are possible. That is, energy and material costs can be saved. This is because the modular configuration of the eccentric screw pump according to the present invention functions without the need for connecting rods or joint joints, and therefore the number of movable parts in the transport medium is relatively small. This also reduces the frictional forces that adversely affect the efficiency and life of the pump. The transport module can be arranged so that the axial force is almost completely offset. The conveying direction can be changed by reversing the rotation direction of the rotor.

  A further advantage is that on the suction side of the drive system, only one seal system is necessary and should be maintained.

  If the eccentric screw pump according to the present invention is used as a so-called immersion pump in the case of the same pipe diameter, that is, the same hole or perforation, the conveyance amount can be increased, for example, twice.

  Hereinafter, embodiments of the present invention will be described by way of example with reference to the accompanying drawings.

1 schematically shows an eccentric screw pump comprising two conveying modules connected to each other by a flow-through housing with a pressure housing arranged at the end. 1 schematically shows an eccentric screw pump with two conveying modules which are connected to one another by a pressure housing, with a suction housing arranged at the end and which allow conveying in the opposite direction relative to one another. Eccentric screw pump comprising two conveying modules, which are connected to each other by a pressure housing, with a suction housing arranged at the end and which allow conveying in the opposite direction with respect to each other, and a drive device including a compensation clutch FIG. 1 schematically shows an eccentric screw pump with a total of four transfer modules connected to each other by a suction housing and two pressure housings, with a suction housing at the end. 1 schematically shows an eccentric screw pump with a total of four transfer modules connected to each other by a pressure housing and two flow-through housings, with a suction housing at the end. 1 is a schematic diagram showing a conventionally known transfer system with a total of four eccentric screw pumps connected in parallel.

  The device according to FIG. 1 shows an eccentric screw pump 2 which is connected to one another by a cross-flow housing 12 and comprises first and second transport modules 4, 6 each including a stator 8 and a rotor 10. A pressure housing 16 having a pressure connection piece 18 is arranged in the second transfer module 6 located at the end opposite to the drive device 14 of the eccentric screw pump 2. All of the transport modules 4 and 6 are configured in the same manner and have a left-handed lead L. The flow-through housing 12 is configured as a pressure housing or a suction housing and is provided with a closing means 20. It is desirable to avoid the dead space by disposing the closing means 20 in the vicinity of the pressure housing. Such dead space can not only adversely affect the flow, but can also deposit the transport medium.

  The eccentric screw pump 2 is provided with a support foot (not shown). In this case, the connecting piece of the cross-flow housing 12 that is not used for transport can be advantageously used as a support foot or a base for assembling the support foot.

  A transport system substantially constituted by the transport modules 4, 6 and the housings 12, 16 is coupled to the drive device 14. The drive device 14 includes a pump housing 22 having a suction connection piece 24 and a drive component 26. Force transmission to the rotor 10 of the first transport module 4 is performed by a drive shaft 30 coupled by an articulated joint 28. Further, the drive device 14 includes a seal 32 for avoiding the conveyance medium from leaking to the outside.

  The rotors 10 of the transport modules 4 and 6 are connected to each other by a rigid coupling 34. During the operation of the eccentric screw pump 2, the transport medium reaches the pump housing 22 from the suction pipe (not shown) via the suction connection piece 24, and passes through the through-flow housing 12 by the transport modules 4 and 6 to the pressure housing. 16 and in this pressure housing 16 is carried via a pressure connection piece 18 into a pressure tube (not shown). The axial force generated in this case acts against the conveying direction and is absorbed by a bearing provided to absorb the axial force. The conveyance modules 4 and 6 in the illustrated embodiment are connected in series, so that twice the pressure can be obtained as compared with a conventionally known eccentric screw pump in which only one rotor / stator assembly is provided.

  FIG. 2 shows an eccentric screw pump 2 comprising two transfer modules 4, 6 connected by a pressure housing 16. In this case, the first transport module 4 has a left-handed lead L, and the second transport module 6 has a right-handed lead R. The rotors 10 are connected to each other by a rigid joint 34. A suction housing 36 having a suction connection piece 24 is disposed at the end of the eccentric screw pump 2 opposite to the drive device 14. Similar to the eccentric screw pump 2 of FIG. 1, the pump housing 22 has a further suction connection piece 24.

  The housing arranged at the end of the eccentric screw pump 2 functions as the suction housing 36 by making the leads L and R in the transport modules 4 and 6 different from left-handed and right-handed. As a result, the transport medium is carried into the pressure housing 16 via any suction connection piece 24 and is transported so as to pass through the pressure connection piece 18. In this case, even if the rotation directions of the rotors 10 driven by the common drive device 14 are the same, the transport medium is carried in the opposite direction with respect to each other. This means that during the operation of the eccentric screw pump 2 it means that the axial forces acting on the rotor 10 oppose each other so that the resultant force acting on the bearing of the drive device 14 is equal to zero or at least Reduced. In this case, it is desirable that the coupling portion 34 for the rotor 10 is configured so as to absorb the generated tensile force. This advantageously reduces the load on the drive shaft 30, the joint joint 28 and the bearing 32, thus reducing wear. Thereby, the dimension of the components of the eccentric screw pump 2 can also be made more cost effective. Mixing means is arranged in the region of the coupling part 34 of the pressure housing 16, and the mixing means is coupled to the rotor and is configured as a stirring element 37. The conveyance modules 4 and 6 in the illustrated embodiment are connected in parallel, so that a conveyance speed twice as high as that of a conventionally known eccentric screw pump can be obtained.

  In the alternative embodiment (not shown) of FIG. 2, the rotor 10 can also be constructed in one piece. Thereby, it is not necessary to provide the coupling part 34. For this purpose, the rotor 10 includes two sections for the transfer modules 4, 6, a first section with a left-handed lead L and a second section with a right-handed lead R.

  FIG. 3 shows an eccentric screw pump 2 similar to the eccentric screw pump shown in FIG. 2, but the drive device 14 is different in the embodiment of FIG. The drive device in this case includes a compensation clutch 33 for transmitting torque to the rotor. Since the drive device 14 in the illustrated embodiment has a compact configuration, the elongated configuration of the eccentric screw pump 2 due to the transfer modules 4 and 6 being connected in series can be compensated almost completely.

  FIG. 4 shows an eccentric screw pump 2 comprising a total of four transport modules 4, 6, 38, 40. In this case, similar to the embodiment of FIG. 2, the two transport modules coupled to each other by the pressure housing 16 are such that the leads in the transport modules 4, 6, 38, 40 of the transport system start from the drive device 14. The suction housings 36 are connected to each other so as to be left-handed / right-handed / left-handed / right-handed. A suction housing 36 having a suction connection piece 24 is disposed at the end of the eccentric screw pump 2 opposite to the drive device 14. The rotors 10 are connected to each other by a rigid joint 34. The transport medium is transported via a total of three suction connection pieces 24 and two pressure connection pieces 18. Since the transfer modules 4, 6, 38, and 40 in the illustrated embodiment are connected in parallel, a transfer speed four times that of a conventionally known eccentric screw pump can be obtained. In this case, since the number of transport modules 4, 6, 38, 40 having left-handed and right-handed leads is equal, the resultant force acting on the bearing of the drive device 14 is equal to zero or at least reduced.

  FIG. 5 shows a further alternative embodiment comprising a total of four transport modules 4, 6, 38, 40. In this embodiment, two pairs of transport modules connected in series and coupled to each other by the flow-through housing 12, ie, the pair of first transport modules 4, 6 and the pair of second transport modules 38, 40 are , Each connected by a pressure housing 16. In this case, the transport module pair 4, 6 and the pair 38, 40 connected in series have different leads, so that the entire transport system has a left-handed / left-handed / right-handed / right-handed lead. , 6, 38, 40.

  During the operation of the eccentric screw pump 2, the transport medium is sucked by the suction connection piece 24 and the pump housing 22 provided in the suction housing 36 and is conveyed through the single pressure connection piece 16. In the illustrated embodiment, each of two transfer modules is connected in series, and the pair of these two transfer modules configured in this way is connected in parallel to form a conventionally known eccentric screw pump. In comparison, twice the conveyance speed and twice the pressure can be obtained. In this case, since the number of transport modules 4, 6, 38, 40 having left-handed and right-handed leads is the same, the resultant force acting on the bearing of the drive device 14 is equal to or at least reduced to zero.

  FIG. 6 shows, for comparison, a known assembly comprising a plurality of conventionally known eccentric screw pumps 42 having the same structure and a plurality. As is apparent from the flow of the conveyance medium represented by the broken line, a total of four eccentric screw pumps 42 can be connected in parallel to obtain a conveyance speed four times that of a single eccentric screw pump. it can. Compared with the eccentric screw pump 2 configured modularly according to the present invention, the previously known assemblies require inconveniently large energy requirements, large manufacturing and maintenance costs, and large space for operating the pump. It is what.

  Each of these four eccentric screw pumps 42 is arranged at the end opposite to the drive device 14, the rotor / stator assembly 44, and the drive device 14, and is provided with a pressure connection piece 18. Is provided. In this case, the transport medium is sucked in the pump housing 22 via the suction connection piece 24 and is carried in the direction of the pressure housing 16, and from the pressure housing 16 to the pressure pipe (not shown) via the pressure connection piece 18. Carried.

  The device according to the present invention is especially configured for the eccentric screw pump 2 and can be used flexibly and can save costs and expenses. The eccentric screw pump 2 can be adapted to a given conveying task with a particularly simple modular construction and with the appropriate number and selection of conveying modules 4, 6, 38, 40 and housings 16, 36. . All that is required for this purpose is a single drive 14, which in particular requires less energy and maintenance requirements. Furthermore, the axial force acting on the bearing of the eccentric screw pump can be reduced by mutually arranging the transport modules having different leads L and R.

02 Eccentric screw pump
04 First transfer module
06 Second transfer module
08 Stator
10 Rotor
12 Cross-flow housing
14 Drive unit
16 Pressure housing
18 Pressure connection piece
20 Closing means
22 Pump housing
24 Suction connection piece
26 Driving parts
28 Fitting
30 Drive shaft
32 seals
33 Compensation clutch
34 Joint
36 Suction housing
37 Stirring element
38 Third transfer module
40 Fourth transfer module
42 Eccentric screw pump (prior art)
44 Rotor-stator assembly (prior art)

Claims (15)

An eccentric screw pump (2) having a modular conveying system, the eccentric screw pump (2) comprising at least two conveying modules (4, 4) each including one rotor (10) and one stator (8). 6, 38, 40), the transport modules (4, 6, 38, 40) are coupled to each other, and only a single drive (14) is assigned to the transport system, and the transport system further comprises , for conveying medium, or include two or more inlet and / or outlet (18, 24), or seen including at least one modular flow housing (12),
The eccentric screw pump (2) further includes a pressure housing (16) and mixing means (37) disposed in the pressure housing,
Two adjacent transport modules (4, 6) are coupled to each other by the pressure housing (16) and are configured to transport a transport medium in a direction opposite to each other, in a direction opposite to each other. The transported transport medium is mixed in the pressure housing (16),
The mixing means (37) is an eccentric screw pump coupled to the rotor (10) .   The eccentric screw pump (2) according to claim 1, wherein each of the transfer modules (4, 6, 38, 40) is provided by a suction housing (36), a pressure housing (16) or a flow-through housing (12). Eccentric screw pumps connected to each other.   The eccentric screw pump (2) according to claim 1 or 2, wherein the rotor (10) of the transfer module (4, 6, 38, 40) is the suction housing (36) or the pressure housing (16). ) Eccentric screw pumps which are connected to each other by a rigid connection (34).   The eccentric screw pump (2) according to claim 3, wherein the rotor (10) is detachably coupled to each other.   The eccentric screw pump (2) according to claim 1 or 2, wherein the rotor (10) is integrally configured for the transport module (4, 6, 38, 40).   The eccentric screw pump (2) according to any one of claims 1 to 5, wherein a specific mixing ratio is determined with respect to the transport medium, depending on the selection and configuration of the transport module (4, 6, 38, 40). Is an eccentric screw pump that can be set.   The eccentric screw pump (2) according to any one of claims 1 to 6, wherein an axial force acting on the driving device (14) is close to zero.   It is an eccentric screw pump (2) as described in any one of Claims 1-7, Comprising: The said conveyance module (4,6,38,40) is an eccentric screw pump arrange | positioned in series.   The eccentric screw pump (2) according to any one of the preceding claims, wherein two adjacent transfer modules (4, 6, 38, 40) are connected to each other by a flow-through housing (12). And an eccentric screw pump configured to convey in the same direction. The eccentric screw pump (2) according to any one of claims 1 to 9 , wherein the conveying system comprises two conveying modules (4, 6, 38, 40). The eccentric screw pump (2) according to claim 10 , wherein the conveying system comprises a pressure housing (16) and a suction housing (36). The eccentric screw pump (2) according to claim 10 , wherein the conveying system includes a pressure housing (16) and a flow-through housing (12). The eccentric screw pump (2) according to any one of claims 1 to 9 , wherein the conveying system comprises four conveying modules (4, 6, 38, 40). The eccentric screw pump (2) according to claim 13 , wherein the conveying system comprises two suction housings (36) and two pressure housings (16). The eccentric screw pump (2) according to claim 13 , wherein the conveying system comprises a suction housing (36), two flow-through housings (12) and a pressure housing (16).

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