Stator for pump, and method for producing stator for pump

Abstract

To provide a stator for a pump improved over the prior art.SOLUTION: A stator for a pump, in particular for a rotary lobe pump or an eccentric screw pump, comprises a base body, which surrounds a pump chamber for a rotor assembly of the pump. The base body includes a support body and a running body. The running body forms a running surface for at least partial contact with the rotor assembly of the pump. The support body and the running body have a common material. A material density of the material of the support body and a material density of the material of the running body are adjusted to be different from one another. The material densities adjusted to be different achieve different elasticity and / or hardness of the material in the support body and the running body. The invention further relates to a method for producing such a stator.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a stator for a pump, in particular for a rotary lobe pump or an eccentric screw pump, the stator according to the invention comprising a base body, which encloses a pumping chamber for a rotor assembly in the pump and includes a support and a runner forming at least partially a running surface for contacting the rotor assembly of the pump.Furthermore, the present invention relates to a method for manufacturing a stator for a pump, as well as a stator for a pump manufactured by such a method. [Background technology]

[0002] Known stators, for example for eccentric screw pumps, are partially provided with an elastomer, for example a coating made from an elastomer, in order to ensure good elastic properties for the rotor moving in the stator during operation of the pump. Alternatively, solid stators, for example designed from metal, are known, which have good wear properties during operation but require high manufacturing precision, have a relatively low pumping capacity or are not, for example, completely sealed.

[0003] With respect to the cross-sectional and / or linear expansion of the elastic material in such a stator, the corresponding stiffness, elasticity and / or hardness within the stator will be the same, respectively, and will depend only on, for example, the thickness and / or specific properties of the selected elastomer. Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to improve upon the state of the art. [Means for solving the problem]

[0005] This problem is solved by a stator for a pump, in particular for a rotary lobe pump or an eccentric screw pump, which comprises a base body, which surrounds a pump chamber for a rotor assembly in the pump, and which includes a support and a running body which at least partially forms a running surface for contacting the rotor assembly of the pump, wherein the support body and the running body have a common material, and the material densities of the material in the support body and the material densities of the material in the running body are adjusted to be different from each other, such that different elasticities and / or hardnesses are achieved in the materials in the support body and the running body due to the differently adjusted material densities.

[0006] With this design of the stator, a common material can be used for the entire stator or for most of the stator, yet achieve a structural distinction between the runner and the support, each of which has different properties that are important during operation of the pump.

[0007] This allows the running body to be endowed with properties aimed at, for example, specific wear resistance, and the support body to be endowed with properties that provide, for example, high elasticity and resilience against mechanical loads.

[0008] The following explains related terms.

[0009] A "pump" is a technical device which conveys a fluid by means of movement, in particular by relative movement of mechanical parts relative to one another. In particular, pumps in the context of the present invention are so-called positive displacement pumps. Such positive displacement pumps convey a fluid in particular by means of a local displacement of the fluid and are designed, for example, as rotary lobe pumps or eccentric screw pumps.

[0010] "Stator" refers to a fixed part of a pump, relative to which, for example, a rotor is movably arranged. Such a stator serves to match exactly with the rotor in a pump, for example a rotary lobe pump, or is designed to ensure elastic abutment of the stator on the rotor or rotor assembly during the rotary or eccentric rotary movement of the rotor, for example in an eccentric screw pump. Together, the stator and rotor act as a "pump", i.e. a technical device for moving a fluid, for example for pumping a liquid, by dynamically moving a volume in the pump through the interaction of the stator and the rotor.

[0011] The term "substrate" refers to the mechanical whole of the stator, which provides the structural integrity of the stator and the corresponding functional aspects. Such a stator substrate completely or partially surrounds a "pump chamber" when the stator is placed in a pump, for example. The pump chamber serves to accommodate a rotor assembly, for example a rotor or rotors, which in this case may be an eccentric screw shaft of an eccentric screw pump. Similarly, a rotor or a corresponding rotor assembly can also refer to a gear of a gear pump, a rotating piston of a rotary lobe pump, or an equivalent technical device in a pump of corresponding design. The core idea of ​​the invention in this context is to manufacture at least one of the two components, i.e. the stator and / or one or more corresponding rotors, from a common material and different material densities, thereby obtaining different technical properties. This is achieved, for example, by suitable manufacturing methods.

[0012] A "support" in this context refers, for example, to a support structure of the substrate or a part of the substrate which serves substantially to mechanically support forces and, for example, to absorb deformations, whereas a "runner" is designed in particular to act against the rotor assembly and to provide a "running surface" for the rotor. For this purpose, it is particularly important that the runner and the running surface provided have, for example, a greater hardness than the support, or have, for example, better wear properties or improved or adapted sliding properties relative to the rotor.

[0013] "Common material" in this context refers in particular to a common substrate or common starting material from which both the support and the running bodies of the stator are formed. As common material, for example, a certain group or type of elastomer can be selected, but also a certain metal, such as special steel. As elastomer, for example, TPEs, i.e. thermoplastic elastomers, may be used. Such TPEs have the elastic properties of elastomers and are nevertheless at least partially softenable or meltable by the action of heat, in contrast to conventional, for example vulcanized elastomers. Such TPEs are often recyclable and therefore sustainable. It should be noted that the support and / or running bodies are formed from a common starting material and have the same or comparable chemical properties after the manufacturing process, but have different macroscopic or microscopic material densities. This different material density does not imply a distinction that deviates from "common material".

[0014] The "material density" of each portion of the substrate in this context refers to the arrangement of material portions to achieve different specific gravities and / or different material percentages in a reference volume; thus, material density is expressed, for example, in g / cm 3 It is possible to express both the weight density in vol.-%, as well as the structural density, for example in vol.-%, which can also be achieved, for example, by a non-uniform distribution of material and defects within a defined volume.

[0015] "Different adjustment" in this context means that the material density of the material in the support is selected to be, for example, smaller or larger than the material density of the material in the running body, i.e., for example, the running body is less porous and / or has a larger specific gravity than the support.

[0016] "Elasticity" refers to the property of absorbing elastic deformations in the material thus produced, providing, for example, a large elongation at break and / or a large energy absorption capacity, without the material being permanently damaged. "Hardness" in this context refers to the resistance of the material to local deformations, for example to mechanical wear due to pressing and / or surface damage. In this case, a "hard" material is more resistant to wear than a "soft" material. In the case of elastomers, the rebound resilience is especially taken into account as an additional or alternative evaluation criterion, which describes the ability of the material to recover from deformation to its original shape after it has been loaded. This property is particularly important when the rotor moves in the stator, since it is essential that the stator returns as quickly and completely as possible to maintain the seal.

[0017] In order to design the running body to be particularly wear-resistant against the rotor, the material density of the running body is greater than the material density of the support body, and therefore the running body has a smaller elasticity and / or a greater hardness and / or adapted resilience than the support body.

[0018] In one embodiment, the support comprises a first support part, a second support part, a third support part and / or further support parts, and the material density of the material in each support part is adjusted to be different from each other, such that due to the differently adjusted material densities, for example, different elasticity and / or hardness is achieved in the material in each support part compared to each other support part, in particular the support parts are arranged in layers substantially radially around the pump chamber.

[0019] This design allows, for example, a mechanically gradual change of the support, where the separation between the respective support parts may be fluid, so that, for example, an elasticity spectrum and / or a hardness spectrum can be achieved, in particular in the radial direction with respect to the pump body. However, corresponding support parts can also be selected as layers, parts or regions of the support. Such "support parts" are different parts, regions or partial regions of the support, which are geometrically assigned.

[0020] In this case, the adapted material density can also be selected gradually or stepwise along the longitudinal axis of the rotor in the eccentric screw pump, so as to counter the increase in internal pressure in the pump chamber due to the design principle of the eccentric screw pump. For this purpose, for example, the hardness of the stator is selected to be small at the inlet side of the eccentric screw pump, where low pressure is applied, and is increased towards the outlet side of the eccentric screw pump, so as to counter the continuously increasing pressure along the conveying direction and still ensure the seal between the stator and the rotor.

[0021] "Radially around the pumping chamber" in this context refers, for example, to the arrangement around the shaft of the rotor, i.e. around the corresponding axis of rotation. It should be noted in this context that "radially" can never be interpreted mathematically exactly and includes technical deviations that are determined, for example, by the rotor's shape or other boundary conditions. Thus, in the case of a rotary lobe pump, the local "radial" arrangement around the pumping chamber can also refer to the corresponding sub-area of ​​the pump with respect to each rotary piston.

[0022] The support and / or in particular each support part has an internal structure, which has pores, cavities and / or chambers as well as webs, lamellae and / or material bridges, and in particular due to the macroscopic material density adjusted by the distribution of the pores, cavities and / or chambers as well as the webs, lamellae and / or material bridges, different elasticities, adapted spring action and / or different hardness, different rebound resilience are achieved in the materials in the support and running body.

[0023] Such an "internal structure" refers, for example, to a geometrically determined or non-geometrically determined arrangement of defects intentionally introduced into the material, where substantially circular defects, e.g. pores, geometrically larger "cavities" or chambers, i.e. intentionally geometrically determined defects, can be introduced. In this case, the corresponding material regions, i.e. webs, lamellae and / or material bridges, have mechanical properties determined by their configuration. "Macroscopic material density" in this context refers, for example, to the material density seen over the entire support and / or support part, where the local material density necessarily differs, e.g. by a large material density in the webs and a small material density in the cavities, which may drop to zero.

[0024] In this way, the stator can be provided locally with, for example, spring elements or elastic support elements.

[0025] In particular in this case, the internal structure can be configured to be fluidly accessible by a pressurized fluid supply or a number of pressurized fluid supplies, and the introduction of pressurized fluid into the pores, cavities and / or chambers of the internal structure through the pressurized fluid supply or through a number of pressurized fluid supplies increases the pressure-induced forces acting on the running body, and / or the withdrawal of pressurized fluid from the pores, cavities and / or chambers of the internal structure through the pressurized fluid supply or through a number of pressurized fluid supplies reduces the pressure-induced forces acting on the running body.

[0026] This allows, for example, the hardness and / or flexibility of the stator to be selectively or even partially adapted as required by adjusting the pressure and / or the volume of the pressure fluid in the internal structure, in particular so that the adaptation of the properties of the stator can be performed with pressure also along the conveying direction, so that the adapted reaction force of the stator on the rotor can also be adjusted if the pressure in the pump increases along the conveying direction.

[0027] A "pressure fluid supply" in this context is, for example, a valve, including in particular a check valve or a controllable valve, a pressure connection or an opening, allowing the supply of a fluid, called "pressurized fluid", for example a gas or a liquid, with a suitably regulated pressure in the internal structure, which allows the appropriate behavior of the stator.

[0028] For this purpose, "introduction", i.e. the supply of pressurized fluid to increase or maintain pressure, or "extraction", i.e. the release of pressurized fluid to reduce or maintain pressure, occurs in response to deformation selectively applied to the stator, for example by the rotor.

[0029] In particular in this case, a pressure fluid supply or a number of pressure fluid supplies are assigned a control device for introducing and / or withdrawing pressure fluid through the pressure fluid supply.

[0030] This allows the pressure and the pressure fluid, and thus the corresponding mechanical behavior in the stator, to be adjusted, for example partially, along the conveying direction.

[0031] In this case, the term "controller" refers to an electronic controller and a valve block controlled by the electronic controller, for example to control or regulate the pressure in response to a pressure sensor.

[0032] In one embodiment, the support body and / or, in particular, each support body part and / or running body are manufactured by a material forming process, in particular by an additive process and / or a sintering process.

[0033] In particular in this case, the prototype method of forming the material makes it possible to directly generate a corresponding material density distribution in the production of the stator, for example by generating a local manufacturing density of the material in the base body in the case of additive methods and / or by generating different grain sizes of starting material in the base body in the case of sintering methods.

[0034] "Material forming prototype process" refers to a process in which a material is formed together with a workpiece, in particular by physical action, from a substrate, base mass or, for example, powder or granules. In this case, for example, TPE granules can be used for the reasons mentioned above. In this case, "additive processes" are known, for example, as "3D printing", i.e. thermoplastic coating, laser sintering or comparable processes. "Sintering" refers to a process, usually based on metal powder, carried out under pressure and high temperature, in which the material is locally pressed and bonded from individual particles, but without the starting material being completely melted.

[0035] In particular in this case, the common material comprises further materials, in particular with different material densities additionally modified by the respective proportions of the further materials in the support body, the respective support body parts and / or the running body.

[0036] As "further materials" it is possible to use, for example, fillers, abrasives and / or other materials for locally influencing the material properties. Thus, for example, the running body can be combined with ceramic powders in order to combine the high density of the running body with the corresponding wear resistance. It is also possible to introduce sliding particles, such as, for example, graphite particles or TPFE particles (the latter material TPFE is also known as Teflon), in order to reduce sliding friction.

[0037] In one embodiment, common materials include plastics, in particular elastomers, thermoplastic elastomers, thermoset plastics and / or thermoplastics, and / or metals, in particular steel, aluminum and / or titanium.

[0038] In another aspect, the object of the present invention is achieved by a method for manufacturing a stator for a pump, in particular according to any one of the above-mentioned embodiments, in which the stator comprises a base body including a support and a running body, the base body enclosing a pump chamber for a rotor in the pump, the running body at least partially forming a running surface for contacting the rotor of the pump, the base bodies having mutually different material densities, the method comprising: - introducing a substrate material into the production chamber so that the substrate material is present in the production chamber; a step of processing the material substrate in a manufacturing chamber, in which the material substrate is converted into a common material by processing, and the processing in the first manufacturing area for manufacturing the support and the processing in the second manufacturing chamber for manufacturing the running body are made different from each other, so that the material density of the support is adjusted to be different from the material density of the material of the running body; Including, The stator can therefore be manufactured in such a way that, by means of differently adjusted material densities, different elasticities and / or different hardnesses are achieved in the support and running bodies.

[0039] In this context, "introduction" of a material substrate into a manufacturing chamber refers to providing a "material substrate", i.e., for example, a starting filament for 3D printing and / or a sintering powder for a sintering process, into the manufacturing chamber, where the manufacturing chamber refers, for example, to a 3D printer, a sintering mold, or an equivalent assembly.

[0040] "Processing" in this context refers to acting on a substrate, for example by applying a heated filament in the case of 3D printing, or by irradiating a powder or granules, for example with a laser, so that the substrate is transformed into a common material, for example by melting. Similarly, processing in sintering methods is carried out by applying pressure and / or heat.

[0041] As a result, as described above, a stator is produced, in which in particular the carriers and the running bodies have different material densities.

[0042] In particular, the processing is carried out by a prototype method for forming the material, in particular by additive and / or sintering methods. In this case, in particular in a common manufacturing process, i.e. in the manufacture of the entire substrate, the respective manufacturing parameters are adapted in order to produce different material densities. For example, the local pressure, the action of the laser, the temperature or the geometry of the corresponding material areas can be adapted.

[0043] In a further aspect the object of the present invention is achieved by a stator for a pump, which is manufactured by the method described above.

[0044] In this context, it should be noted that in addition to the manufacture of a stator according to the present invention, the rotor of a pump is equivalently included, for example, if different properties of the material on the rotor in the pump are advantageous for a particular design of the pump similar to the respective embodiment of the stator shown.

[0045] According to a further aspect, the object of the present invention is achieved by a pump, in particular a rotary lobe pump and / or an eccentric screw pump, having a stator and / or a rotor according to one of the above-mentioned embodiments and / or the stator and / or the rotor are manufactured by the above-mentioned method.

[0046] The present invention will be described in detail below based on embodiments. [Brief description of the drawings]

[0047] [Figure 1] FIG. 1 is a schematic cross-sectional side view of a rotary lobe pump. [Diagram 2] FIG. 1 is a side cross-sectional view showing an eccentric screw pump. [Diagram 3] FIG. 2 is a schematic cross-sectional view showing a stator of the rotary lobe pump in FIG. [Figure 4] FIG. 3 is a schematic cross-sectional view showing a stator of the eccentric screw pump in FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] The rotary lobe pump 101 comprises a housing 102 having two housing parts 103, 104. A stator 105 of the housing part 103 and a stator 106 of the housing part 104 delimit an internal space 111 in which rotary pistons 121, 123 are arranged rotatably along respective rotational directions 171, 173. The rotary pistons 121, 123 are arranged in opposite directions and function within the elliptical housing 102 to pump a liquid along a conveying direction 181. A corresponding liquid is supplied to an inlet 161, is pumped by the rotary pistons 121, 123 in the internal space 111 and is discharged from an outlet 163.

[0049] The internal structure of stator 105 is the same as that of stator 106 and is shown as an example.

[0050] In this case, it is preferable that the rotary pistons 121, 123 have a hard surface to ensure good wear behavior, while the basic structure of the stators is designed elastically to allow for close contact of the rotary pistons, so that the rotary lobe pump has good sealing properties and therefore high efficiency.

[0051] The stator 105 comprises a support layer 321 facing the housing part 103, followed towards the rotating piston 121 by a support structure 323 and a running layer 325 facing the rotating piston 121. The illustrated stator is manufactured by a 3D printing method, by which the support layer 321 is manufactured with a medium density and medium elasticity. The support structure 323 has a free space 324 intentionally introduced, which results in a truss-like structure with high elasticity and increased resilience against deformation. In contrast, the running layer 325 is formed using additives that increase the density and wear resistance, so that the running side 363 facing the rotating piston 121 is designed to be wear-resistant and the housing side 361 facing the housing part 103 is elastically deformable. It should be noted that the structure of the stator can be similar to that of the rotating piston, which in this case is similar to the stator described above. Therefore, the surface of the rotary piston can also be configured similarly to the structure of the stator 105, i.e. as an elastic structure manufactured by 3D printing, in which case the stator is made of special steel, for example, so that the rotary piston has an elastic surface also in the axial direction, thereby improving the sealing performance in the axial direction, for example.

[0052] The eccentric screw pump 201 comprises a first housing part 203 and a pump housing 204. A motor 231 is arranged outside the housing part 203, which drives a shaft 235 via a transmission 233. The shaft 235 is form-fittingly connected to an eccentric screw 237. Alternatively, the connection can be made by means of a coupling. The eccentric screw 237 is arranged in the pump housing 204 so that it can rotate in a rotation direction 271 in an elastic stator 205. In this case, the eccentric screw 237 and the stator 205 are configured in a serpentine manner over the entire circumference, so that when the eccentric screw 237 rotates, liquid is pumped from the interior space 211 in the housing part 203 through a pump chamber 213 in the pump housing 204 along a conveying direction 281. In this way, liquid can be sucked in through an inlet 261 of the housing part 203 and pumped along the pump chamber 213 to an outlet 263.

[0053] Stator 205 (see FIG. 4 for details) is designed with different densities and different structures throughout its volume, but is made of a common material, in this case, stator 205 is made of an elastomer.

[0054] On the housing side 461, the stator 205 has projections 427 for form-fitting into the pump housing 204, on which the support layer 221 is formed with a medium density. In the direction of the eccentric screw 237, a support structure 423 is arranged similarly to the support structure 323, which also has a free space 424. The support structure 423 is therefore also formed in the shape of a truss. On the running side 463, the layer 425 facing the eccentric screw 237 is designed with a high density and therefore has a high wear resistance.

[0055] The stator 205 is manufactured by 3D printing, whereby different densities in the individual layers and structures are obtained by setting corresponding printing parameters. In the region of the support structure 423, a truss-like structure is obtained by omitting material. The stator 205 can have chambers (not shown) in its interior, which are separated from one another by the support structure 423, for example, where a number of chambers are arranged along the conveying direction 281 of the eccentric screw pump 201 and can be loaded with compressed air in a separated state by compressed air connections (not shown), whereby the hardness of the chambers can be adjusted. Thus, for example, the elastic behavior of the stator 205 can be freely adjusted within a wide range. For example, the hardness of the stator can be gradually increased and thus adjusted to correspond to the increasing pressure in the eccentric screw pump 201 along the conveying direction 281. [Explanation of symbols]

[0056] 101 Rotary Lobe Pump 102 Housing 103 Housing part 104 Housing part 105 Stator 106 Stator 111 Interior Space 121 Rotating Piston 123 Rotating Piston 161 Entrance 163 Exit 171 Rotation direction 173 Rotation Direction 181 Transport direction 201 Eccentric screw pump 203 Housing part 204 Pump housing 205 Stator 211 Interior Space 213 Pump Room 231 Motor 233 Transmission 235 Shaft 237 Eccentric Screw 261 Entrance 263 Exit 271 Rotation direction 281 Transport direction 321 Support layer 323 Support structure 324 Free Space 325 Running Layer 361 Housing side 363 Running side 421 Support layer 423 Support structure 424 Free Space 425 Running Layer 427 Protrusion 461 Housing side 463 Running side

Claims

1. A stator (105, 106, 205) for a pump (101, 201), in particular for a rotary lobe pump (101) or an eccentric screw pump (201), comprising a base (321, 323, 325, 421, 423, 425, 427) surrounding a pump chamber (111, 213) for a rotor assembly (121, 123, 273) of said pump (101, 201) and including a support (321, 323, 421, 423) and a runner (325, 425) at least partially forming a running surface for contacting said rotor assembly of said pump (101, 201), A stator characterized in that the support body (321, 323, 421, 423) and the running body (325, 425) have a common material, and the material density of the material in the support body (321, 323, 421, 423) and the material density of the material in the running body (325, 425) are adjusted to be different from each other, and therefore, due to the material densities adjusted to be different, different elasticities and / or hardnesses are achieved in the materials in the support body (321, 323, 421, 423) and the running body (325, 425).

2. A stator as described in claim 1, characterized in that the material density of the running body (325, 425) is greater than the material density of the support body (321, 323, 421, 423), and therefore the running body (325, 425) has a particularly smaller elasticity and / or a greater hardness than the support body (321, 323, 421, 423).

3. 3. A stator according to claim 1 or 2, characterized in that the support (321, 323, 421, 423) comprises a first support part (321, 421), a second support part (323, 423), a third support part (427) and / or further support parts, and the material densities of the material in each of the support parts (321, 323, 421, 423, 427) are adjusted to be different from one another, such that due to the differently adjusted material densities a different elasticity and / or hardness is achieved for the material in each of the support parts (321, 323, 421, 423, 427) compared to the other support parts (321, 323, 421, 423, 427), in particular the support parts (321, 323, 421, 423, 427) are arranged in layers substantially radially around the pump chamber (111, 213).

4. A stator according to any one of claims 1 to 3, characterized in that the support (321, 323, 421, 423) and / or each support part (321, 323, 421, 423, 427) has an internal structure (323, 324, 423, 424), the internal structure (323, 324, 423, 424) being provided with pores, cavities (324, 424) and / or chambers, webs, lamellae (323, 424) and / or A stator having material bridges, characterized in that different elasticities and / or different hardnesses are achieved in the material of the support (321, 323, 421, 423) and the running body, in particular by the macroscopic material density being adjusted by the distribution of the pores, the cavities (324, 424) and / or the chambers, as well as the webs, the lamellae (323, 423) and / or the material bridges.

5. 5. A stator according to claim 4, characterized in that the internal structure (323, 324, 423, 424) is configured to be fluidly accessible by a pressurized fluid supply or a plurality of pressurized fluid supplies, and the introduction of pressurized fluid through the pressurized fluid supply or through the plurality of pressurized fluid supplies into the pores, the cavities and / or the chambers of the internal structure (323, 324, 423, 424) increases the pressure-induced force acting on the running body, and / or the withdrawal of pressurized fluid from the pores, the cavities and / or the chambers of the internal structure (323, 324, 423, 424) through the pressurized fluid supply or through the plurality of pressurized fluid supplies reduces the pressure-induced force acting on the running body.

6. 6. A stator according to claim 5, characterized in that the or each of the pressure fluid supplies is assigned a control device for introducing and / or withdrawing the pressure fluid through the pressure fluid supply.

7. A stator according to any one of claims 1 to 6, characterized in that the support (321, 323, 421, 423) and / or in particular the respective support parts (321, 323, 421, 423, 427) and / or the running bodies (325, 425) are manufactured by a prototype method of forming a material, in particular by an additive method and / or a sintering method.

8. A stator according to any one of claims 1 to 7, characterized in that the common material comprises a further material, in particular in that the different material densities are additionally modified by the respective proportions of the further material in the support (321, 323, 421, 423), in the respective support parts (321, 323, 421, 423, 427) and / or in the running body (325, 425).

9. A stator according to any one of the preceding claims, characterized in that the common material comprises a plastic, in particular an elastomer, a thermosetting plastic and / or a thermoplastic plastic and / or a metal, in particular steel, aluminium and / or titanium.

10. A method for manufacturing a stator (105, 106, 205), in particular for a pump (101, 201) according to any one of claims 1 to 9, said stator (105, 106, 205) comprising a base body (321, 323, 325, 421, 423, 425, 427) including a support (321, 323, 421, 423, 425, 427) and a running body (325, 425), said base body (321, 323, 325, 427) being made of a sintered material, a pump chamber (111, 213) for a rotor in the pump (101, 201), the running body (325, 425) at least partially forms a running surface for contacting the rotor of the pump (101, 201), the base bodies (321, 323, 325, 421, 423, 425, 427) have different material densities, and the method comprises: - introducing a substrate material into the production chamber so that said substrate material is present in said production chamber; a processing step of processing the material substrate in the manufacturing chamber, the processing converting the material substrate into a common material, and adjusting the density of the material in the support (321, 323, 421, 423) to be different from the material density of the material in the running body (325, 425) by making the processing in the first manufacturing area for manufacturing the support (321, 323, 421, 423) different from the processing in the second manufacturing area for manufacturing the running body (325, 425); Including, Thus, the stator (105, 106, 205) is manufactured such that, due to the differently adjusted material densities, different elasticities and / or different hardnesses are achieved in the support (321, 323, 421, 423) and in the running body (325, 425).

11. 11. The method according to claim 10, characterized in that the treatments comprise prototyping methods, in particular additive methods and / or sintering methods, of forming a material, and that the treatments are carried out in a common manufacturing process, in particular by adaptation of the respective manufacturing parameters.

12. A stator (105, 106, 205), in particular for a pump (101, 201) according to any one of claims 1 to 9, manufactured by a method according to claim 10 or 11.

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