Pump assembly

Abstract

A pump assembly (1) is disclosed, comprising at least a pump (2) with a pressure side (3) and a suction side (4) and a drive unit (5) for the pump (2), which are arranged in a common housing (6), wherein the drive unit (5) is an axial flow electric actuator, comprising a stator (7) anti-rotatably connected to the housing (6) and a rotor (8) rotatably arranged relative to the housing (6), wherein the rotor (8) is arranged opposite the stator (7) along the axial direction (10) at a first end side (9) and constitutes an external conveying device (11) of the pump (2) and has a first conveying profile (13) at an inner circumferential surface (12), wherein an internal conveying device (15) of the pump (2) is arranged in the rotor (8) in the radial direction (14), which has a second conveying profile (17) at an outer circumferential surface (16), which works together with the first conveying profile (13) for conveying fluid (18).

Description

Technical Field

[0001] This invention relates to a pump assembly, comprising at least a pump and a drive unit for the pump, arranged within a common housing. The drive unit is an axial-flow electric actuator, comprising a stator anti-rotatably connected to the housing and a rotor rotatably arranged relative to the housing. The rotor constitutes the external conveying device of the pump and has a first conveying profile (e.g., a first engagement portion or blade of a vane pump) on its inner circumferential surface. An internal conveying device of the pump is arranged radially within the rotor, having a second conveying profile (e.g., a second engagement portion or a cylindrical outer circumferential surface) on its outer circumferential surface. This second conveying profile interacts with the first conveying profile for conveying fluid and, if necessary (in the case of the engagement portion), for driving the internal conveying device through the rotor. Background Technology

[0002] In known pump implementations, the pump rotor is arranged on a shaft that extends from the housing of the pump assembly.

[0003] For example, a pump assembly is known from DE 102015207748 A1. A fluid pump driven by an electric motor is described therein. Here, the pump rotor of the fluid pump is connected to the electric motor. The electric motor is an axial-flow motor, whose motor rotor is also the pump rotor or the driving rotor. The pump rotor and the electric motor rotor are mounted in a common housing, in which the pump rotor and the electric motor rotor are integrated in a disc shape to rotate as a combined rotor, wherein the common housing has a fluid inlet and a fluid outlet relative to the combined rotor. A pump chamber or fluid delivery chamber is arranged enclosedly in the common housing and the fluid inlet and fluid outlet to the pump chamber are realized axially along the axis of rotation.

[0004] A pump assembly is known from DE 102017113825 A1, comprising at least one pump and a drive unit for the pump, arranged within a common housing. The drive unit is an axial-flow electric actuator, comprising a stator anti-rotatably connected to the housing and a rotor rotatably arranged relative to the housing. The rotor constitutes the external delivery device of the pump, wherein an internal delivery device of the pump is arranged radially within the rotor, which interacts with a first delivery profile for conveying fluid and, if necessary (in the case of engagement), for driving the internal delivery device through the rotor. The internal delivery device is arranged on an outer casing. No mechanical supports are provided for the external delivery device and the rotor. To achieve the most leak-free operation possible, the sidewalls surrounding the rotor are adjusted to a predetermined distance from each other via a traction device. Summary of the Invention

[0005] There remains a continued need for pumps designed to be further simplified and robust and durable for operation. In particular, a compact pump assembly that can be manufactured as easily as possible and operated with minimal wear should be recommended.

[0006] A pump assembly with the features according to claim 1 helps to achieve these objectives. Advantageous improvements are the subject of the dependent patent claims. The features listed in the patent claims can be combined with each other in a technically meaningful manner and can be supplemented by the explanatory facts of the specification and / or the details of the drawings, wherein further embodiments of the invention are indicated.

[0007] A pump assembly is proposed, comprising at least a pump with a pressure side and a suction side, and a drive unit for the pump arranged in a common housing. The drive unit is an axial-flow electric actuator, comprising a stator anti-rotatably connected to the housing and a rotor rotatably arranged relative to the housing. The rotor is arranged axially opposite the stator or the stator-side housing (i.e., the housing surrounding the stator) at a first end and constitutes the external delivery device of the pump. The external delivery device has a first delivery profile on its inner circumferential surface. An internal delivery device of the pump is arranged radially within the rotor, having a second delivery profile on its outer circumferential surface, which interacts with the first delivery profile to deliver fluid. The internal delivery device is supported on a centering element anti-rotatably connected to the housing. At least the rotor and the external delivery device are configured to be supported only via the fluid being delivered through the pump (rotatable relative to other parts of the pump assembly). A first flow guiding structure is arranged between at least the first end side of the (rotor / external conveying device) and the stator (or the housing on the stator side) and connected to the pressure side, so that the gap between the first end side and the stator (or the housing on the stator side) can be established by fluid during the operation of the pump assembly.

[0008] Electric drives typically consist of a stator and a rotor, which are arranged coaxially with each other. The rotor is referred to here as the support for the permanent magnets, while the stator has coil assemblies. In the case of axial-flow motors, the rotor and stator are arranged sequentially, particularly along the axial direction. Here, magnets of different magnetizations are alternately arranged on the rotor along the circumferential direction.

[0009] The stator coil assembly has a core, for example, made of SMC (Silicon-Modulated Molding), surrounded by current-guiding windings. Each core can be an element arranged such that it is magnetized when current is guided through the current-guiding windings surrounding the core. The current-guiding windings can be designed as coils.

[0010] SMC is composed primarily of electrically isolated iron powder particles. Iron losses in SMC parts are typically low in alternating electric fields. Therefore, it seems desirable in this respect to use SMC, at least partially, as a replacement for the most commonly used steel laminates (sheet steel or electrical steel) in motors. To construct components made of SMC, the particles are compacted and hardened. Here, the SMC material is not sintered. Instead, temperature regulation below the melting temperature is achieved, which is sufficient to ensure that the material persistently maintains its set geometry.

[0011] The rotor of an electric drive may have permanent magnets in the gap or it may also have soft magnetic elements. Thus, using permanent magnets as electric drives can create perpetually excited synchronous or brushless DC motors, abbreviated as BLDC, while using soft magnetic elements, for example, can create reluctance motors as electric motors in the form of axial, radial, or transverse structures.

[0012] The rotor and stator together constitute the drive unit of the pump assembly.

[0013] The rotor has a first conveying profile (e.g., a first engagement portion) on its inner circumferential surface, and the internal conveying device interacts with a second conveying profile (e.g., a second engagement portion) arranged on the outer circumferential surface of the internal conveying device to convey fluid. In the case where the conveying profile is constructed as an engagement portion, the internal conveying device is driven by an external conveying device.

[0014] A separate drive for the internal conveying device (e.g., via the shaft of the internal conveying device) is unnecessary. The rotor and the internal conveying device together constitute the pump assembly, which delivers fluid from the suction side or low-pressure side (fluid inlet) to the pressure side or high-pressure side (fluid outlet).

[0015] For such pump assemblies, cycloidal pumps and internal gear pumps (also known as crescent pumps) are suitable. Both pump types are characterized by rotors (internal and external conveying devices) with parallel, yet radially spaced-apart, rotating axes of rotation. Driven by the engaging meshing portions, the drive of one conveying device is achieved through the drive of the other.

[0016] As a pump assembly, vane pumps and roller vane pumps can also be used, wherein the external conveying device includes vanes or rollers that are radially movable relative to the axis of rotation, forming a first conveying profile. The second conveying profile is formed, for example, by the cylindrical outer circumferential surface of the internal conveying device, which works in conjunction with the vanes or rollers.

[0017] The rotor and conveying components are arranged, especially in sliding bearings. During the operation of the pump assembly, a fluid film is installed in the sliding bearings, particularly in the bearings acting in the relative axial direction, which reduces friction between the different moving components.

[0018] The rotor, especially when used with external conveying devices, is implemented without a shaft or arranged without support in the radial direction or only with sliding support.

[0019] In the operation of an axial-flow electric drive, forces arise in the axial direction, causing the rotor to be attracted toward the stator along the axial direction. In the case of the embodiment with only one stator proposed here for a compact pump assembly, these forces may result in the rotating rotor contacting the stator or the housing surrounding the stator. This problem is exacerbated in pump assemblies where the rotor is not arranged on a shaft or is not supported in the relative radial direction, because a shaftless rotor may be more prone to tilting during operation. In cases where the rotor is also arranged with only a slight skew (the rotor ends are generally not manufactured to be truly perpendicular to the axis of rotation), only localized contact may occur between the rotor and the housing or stator. Here, the rotor can exert a material removal effect on the housing or stator, causing persistent damage to the pump assembly and potentially significantly limiting its service life.

[0020] In the case of current pump assemblies, rotor tilting is prevented or reduced, especially by using the largest possible diameter of the rotor's plane that acts as a support relative to the axial direction.

[0021] It is suggested here that a first flow guiding structure be arranged between the first end side of the rotor and the stator or stator-side housing, and connected to the pressure side, so that a gap between the first end side and the stator or stator-side housing can be created by fluid during the operation of the pump assembly. The pressure set by the flow of fluid through the pump assembly on the pressure side is used here to set and maintain the axial distance between the first end side and the stator or housing.

[0022] The distance between the electromagnetic rotor section (magnet) and the electromagnetic stator section is approximately 0.5 mm and is not significantly affected by the fluid. In the case of pump assembly operation, the gap formed by the fluid between the rotor and stator or the stator-side housing is specifically designed solely to prevent friction between components and thus prevent wear. The gap (i.e., the distance formed by the fluid) is significantly smaller than the distance between the electromagnetic components of the rotor and stator.

[0023] The first flow guiding structure specifically includes a channel structure constructed on at least one of the surfaces forming the gap. These surfaces are formed at least by the first end side of the rotor and by the walls of the stator or housing opposite to the first end side. In particular, there is precisely no gap with a constant gap size, but rather the gap size varies locally due to the channel structure implemented at at least one surface. Through this channel structure, fluid can be conveyed through the gap (and exit via the gap), especially at least in the radial direction. In particular, at least one flow channel for fluid is provided along which fluid is conveyed through the gap (and exits via the gap).

[0024] The fluid should be primarily directed into the gap to reduce friction between components. Directing the fluid beyond the gap is only a technically necessary drawback to facilitate fluid delivery into the gap. In particular, fluid should not be directed beyond the gap, and internal leakage should be kept as minimal as possible.

[0025] In particular, a substantially constant pressure is provided for the fluid along the extension of the first guide structure or along the channel structure in the gap. Thus, there are no throttling sections along the flow channels of the first guide structure or along the channel structure, which cause stepwise or continuous pressure drops. Here, throttling pressures can certainly exist between different flow channels of the channel structure.

[0026] Specifically, the pump assembly is implemented such that the pressure generated by the fluid during the operation of the pump assembly (just) compensates for the axial force acting between the stator and rotor on the pressure side. If necessary, the fluid pressure present in the gap between the rotor and stator can be adjusted via a (adjustable or constant) throttle valve.

[0027] In particular, the rotor extends axially over a certain width between the first end facing the stator and the second end opposite it, wherein the first and second conveying profiles extend correspondingly over the same width. The conveying profiles have the same width, thereby allowing the ends of the internal and external conveying devices to be arranged radially aligned with each other.

[0028] In particular, the second conveying profile works together with the first conveying profile to drive the internal conveying device, which is rotatably supported on a centering element. Here, the internal conveying device is also supported only by the fluid being conveyed through the pump.

[0029] In particular, the first flow guiding structure is also constructed at the internal conveying device, thereby ensuring the clearance between the internal conveying device and the centering element during the operation of the pump assembly. Specifically, this first flow guiding structure differs from that constructed between the rotor and stator, because the axial force acts primarily between the rotor and stator and is transmitted to the internal conveying device only via contact friction of the conveying profile, originating from the rotor or the external conveying device.

[0030] In particular, the housing has a pressure pipe at a second end of the rotor, which is positioned opposite the first end, that is connected to the pressure side of the pump assembly. In particular, the first flow guiding structure is connected to the pressure pipe (only) via a centering element and / or via a delivery profile.

[0031] In particular, the fluid originates from the pressure pipe and is (only) conveyed to the first flow guiding structure via the centering element.

[0032] In particular, the internal conveying device is rotatably supported on the first outer circumferential surface of the centering element, wherein the second flow guiding structure for connecting the pressure tube and the first flow guiding structure is at least partially constructed on the first outer circumferential surface. This, in particular, allows for hydrodynamic or hydrostatic support of the internal conveying device on the centering element.

[0033] The second flow guiding structure can be constructed in particular according to the form of the first flow guiding structure, wherein the second flow guiding structure is configured to create a gap extending parallel to the axis of rotation between the centering element and the internal conveying device.

[0034] In particular, the housing has a suction pipe connected to the suction side at a second end of the rotor, which is arranged opposite to the first end. The conduction of fluid from the first guide structure, which may be referred to as a leakage, is achieved, in particular, via the second outer circumferential surface of the rotor toward the suction pipe. This leakage is especially useful for the lubrication of the opposing surfaces of the rotor and the housing.

[0035] Using this pump assembly, fluid can be delivered from the suction pipe to the pressure pipe via a delivery profile. The amount of fluid used for lubrication and support of components and for ensuring clearance can at least partially (as a leak) flow from the pressure side to the suction side via the clearance (return).

[0036] Specifically, fluid originates from a pressure pipe, passes through a centering element, and is conveyed to the first end side of the rotor via a second flow guiding structure. Specifically, the fluid (then, however, primarily as a leak) is conveyed outward along the gap between the first end side and the stator, and at least radially beyond the gap. The fluid (then) flows via the second outer circumferential surface of the rotor (i.e., between the housing and the rotor) to the second end side and to the suction side disposed there.

[0037] In particular, the rotor and the external conveying device are implemented as a single piece, preferably as a single piece, i.e., manufactured together.

[0038] In particular, the rotating components (rotor, external conveying device, internal conveying device) of the pump assembly are arranged without contact with the stationary components (housing, stator, centering element) of the pump assembly, at least during the operation of the pump assembly. In particular, there is no mechanical contact between the rotating components and the stationary components of the pump assembly, at least during the operation of the pump assembly.

[0039] In particular, all rotating components operate in the fluid. Specifically, the fluid prevents contact between the rotating components of the pump assembly and the stationary components of the pump assembly, or ensures a contactless arrangement.

[0040] In particular, the tolerances of components that should be manufactured with high precision can be reduced, thereby lowering the cost of manufacturing pump assemblies. The perpendicularity that is usually necessary between the axis of rotation and the first end side is implemented here with particularly low precision because the clearance between the rotor and the housing or stator is ensured by the fluid.

[0041] In the case of this pump assembly, in particular, the parallelism of the rotor end faces is the remaining important tolerance that must be implemented with great precision. It can be manufactured very cost-effectively (e.g., by double-disc grinding).

[0042] In particular, at least the rotor is manufactured using powder metallurgy. In particular, at least the stator is manufactured using powder metallurgy. In particular, the rotor is also manufactured using sintering technology.

[0043] Priority is, the pump is

[0044] - A cycloidal pump or internal gear pump (also known as a crescent pump) wherein a first delivery profile is a first engagement portion and a second delivery profile is a second engagement portion, wherein the engagement portions have different numbers of teeth from each other; or

[0045] - Vane pump or roller vane pump;

[0046] The first rotation axis of the rotor and the second rotation axis of the internal conveying device are arranged parallel to each other and spaced apart in the radial direction.

[0047] In particular, the pump assembly has only static seals, that is, seals arranged only between anti-rotation components. Therefore, reliable and durable sealing can be ensured by static seals alone.

[0048] The pump assembly has the following operating parameters in particular:

[0049] - Rated power consumption (in watts):

[0050] 0 to 2000; preferably 50 to 200;

[0051] - Nominal maximum working pressure (in bar):

[0052] 0 to 100; preferably 4 to 12;

[0053] -Volume efficiency (in liters per minute):

[0054] 0 to 50; preferably 3 to 12;

[0055] - Rotor speed (in revolutions per minute):

[0056] 0 to 7000; preferably 1000 to 4000.

[0057] The gap between the first end of the rotor (especially outside the magnet area) and the housing or stator, that is, the gap forming the sliding bearing or the gap formed by the first flow guiding structure, is at least 0.003 mm, preferably up to 0.1 mm, particularly preferably up to 0.05 mm or even up to 0.01 mm during the operation of the pump assembly.

[0058] In particular, the gap between the magnet and the housing or stator is at least 0.2 mm, preferably at least 0.3 mm. Preferably, the gap in this area is at most 1.5 mm, particularly preferably at most 1.0 mm, and especially 0.3 to 0.7 mm.

[0059] The use of indefinite articles (“a,” “an,” “a kind,” and “once”) should be understood, especially in patent claims and descriptions that restate those claims, as such and not as numbers. Accordingly, the concepts or components introduced therein can therefore be understood as existing at least once and, in particular, however, as existing multiple times.

[0060] As a precaution, it should be noted that the numbers used herein (“first,” “second,” ...) are primarily (only) used to distinguish multiple similar objects, dimensions, or processes, i.e., the relationships and / or order between these objects, dimensions, or processes are not necessarily given in advance. If the relationships and / or order are necessary, this will be explicitly stated herein or will become apparent to those skilled in the art in the study of the specifically described design schemes. If a component may appear multiple times (“at least once”), a description relative to one of these components may apply equally to all or most of these components; however, this is not mandatory. Attached Figure Description

[0061] The invention and its technical scope are further described below with the aid of the accompanying drawings. It should be noted that the invention should not be limited to the embodiments cited. In particular, unless otherwise explicitly shown, it is equally possible to extract certain aspects of the facts illustrated in the drawings and combine them with other components and knowledge derived from the specification. It should be particularly noted that the dimensions shown in the drawings are merely schematic. Wherein:

[0062] Figure 1 A pump assembly is shown in perspective view and exploded view;

[0063] Figure 2 A pump assembly is shown in a cross-sectional side view, illustrating the flow direction of fluid from the pressure side to the suction side.

[0064] Figure 3 The pump assembly is shown in a cross-sectional side view, with the flow direction from the pressure side to the first end side;

[0065] Figure 4 A portion of the pump assembly is shown in a perspective view, with [details omitted]. Figure 3 Part of the flow direction;

[0066] Figure 5 A portion of the pump assembly is shown in a perspective view, with [details omitted]. Figure 3 The connection of the flow direction to according to Figure 4 The other part of the flow direction;

[0067] Figure 6 Shown in perspective view according to Figure 3 Part of the pump assembly;

[0068] Figure 7 A portion of the pump assembly is shown in a perspective view, with [details omitted]. Figure 3 The flow direction and its connection to the flow direction according to Figure 5 The other part of the flow direction;

[0069] Figure 8 The cross-sectional perspective view shows the results according to Figure 2 Pump components. Detailed Implementation

[0070] Figure 1 A pump assembly 1 is shown in perspective view and exploded view. Figure 2 The pump assembly 1 is shown in a cross-sectional side view, with an illustration of the flow direction 34 of fluid 18 from the pressure side 3 to the suction side 4. Figure 3 The pump assembly 1 is shown in a cross-sectional side view, with a flow direction 34 from the pressure side 3 to the first end side 9. Figure 4A portion of pump assembly 1 is shown in a perspective view, with [details omitted]. Figure 3 The flow direction is part of 34. Figure 5 A portion of pump assembly 1 is shown in a perspective view, with [details omitted]. Figure 3 The flow direction of 34 is connected to according to Figure 4 The flow direction is towards another part at point 34. Figure 6 Shown in perspective view according to Figure 3 It is part of pump assembly 1. Figure 7 A portion of pump assembly 1 is shown in a perspective view, with [details omitted]. Figure 3 A portion of the flow direction 34 and the connection of the flow direction 34 to the flow direction 34 according to Figure 5 The flow direction is towards another part at point 34. Figure 8 Shown in cross-sectional perspective view according to Figure 2 Pump assembly 1. Figures 1 to 8 Let's describe it together below.

[0071] Figure 1 and Figures 3 to 8 Only the rotor 8, the external conveying device 11, and the internal conveying device 15 are not shown according to the invention. Here, the rotor 8 is shown as an assembly consisting of two components. The conveying profiles 13, 17 of the conveying devices 11, 15 do not extend to the first end side 9, but extend through a width 23 less than that of the rotor 8.

[0072] Pump assembly 1 includes a pump 2 with a pressure side 3 and a suction side 4, and a drive unit 5 for the pump 2, both arranged within a common housing 6. The drive unit 5 is an axial-flow electric actuator, comprising a stator 7 anti-rotatably connected to the housing 6 and a rotor 8 rotatably arranged relative to the housing 6. The rotor 8 is positioned opposite the stator 7 along an axial direction 10 at a first end side 9 and constitutes an external delivery device 11 of the pump 2. The external delivery device 11 has a first delivery profile 13 at its inner circumferential surface 12. An internal delivery device 15 of the pump 2 is arranged within the rotor 8 in the radial direction 14, having a second delivery profile 17 at its outer circumferential surface 16, which interacts with the first delivery profile 13 to deliver fluid 18. The internal delivery device 15 is supported on a centering element 19 anti-rotatably connected to the housing 6. The rotor 8 and the external delivery device 11 are rotatably supported relative to the other components of the pump assembly 1 only via the fluid 18 delivered by the pump 2. A first flow guiding structure 20 is arranged between the first end side 9 and the stator 7 and is connected to the pressure side 3, so that a gap 21 between the first end side 9 and the stator 7 can be established by fluid 18 during the operation of the electric drive.

[0073] The stator 7 has a core 32, for example, made of SMC, which is surrounded by a current-carrying winding 31.

[0074] The rotor 8 of the electric actuator has a magnet 33. The core 32 and the winding 31 are arranged at intervals relative to the magnet 33 through a gap 21.

[0075] The rotor 8 has a first conveying profile 13 (here, the first engagement portion) on its inner circumferential surface 12. An internal conveying device 15, via this profile, interacts with a second conveying profile 17 (here, the second engagement portion) arranged on the outer circumferential surface 16 of the inner circumferential surface 15 to convey fluid 18. In the case where the conveying profiles 13 and 17 are configured as engagement portions, the internal conveying device 15 is driven via an external conveying device 11. The first axis of rotation 29 of the rotor 8 (and the external conveying device 11) and the second axis of rotation 30 of the internal conveying device 15 are arranged parallel to each other and spaced apart from each other in the radial direction 14. The pump 2 is implemented as a cycloidal pump.

[0076] During operation of the axial-flow electric drive, a force occurs in the axial direction 10, causing the rotor 8 to be attracted towards the stator 7 along the axial direction 10. The gap 21 between the first end side 9 and the stator 7 is set by fluid 18 during operation of the electric drive via a first flow guide structure 20 connected to the pressure side 3 and arranged between the first end side 9 and the stator 7. The pressure of the fluid 18 set on the pressure side 3 by the pump assembly 1 is used here to set and maintain the distance along the axial direction 10 between the first end side 9 and the stator 7 or the housing 6.

[0077] The rotor 8 extends along the axial direction 10 through a width 23 between a first end side 9 facing the stator 7 and a second end side 22 arranged opposite to it, wherein the first conveying profile 13 and the second conveying profile 17 extend through the same width 23 accordingly. Figure 2 According to the invention, the width 23 extends through the rotor 8 and is based on Figure 1 and Figures 3 to 8 (Not according to the invention) only extends through a portion of the width 23 of the rotor 8.

[0078] The housing 6 has a pressure pipe 24 connected to the pressure side 3 at the second end side 22 of the rotor 8, which is arranged opposite to the first end side 9 (see...). Figure 4 The first guide structure 20 is via the centering element 19 and / or via the transport profiles 13, 17 (see...). Figure 2 On the left side of the rotation axis 29, 30: the connection between the pressure tube 24 and the first guide structure 20 is also only connected to the pressure tube 24 via the delivery profile 13, 17).

[0079] Fluid 18 originates from pressure pipe 24 and is conveyed via centering element 19 and / or delivery profiles 13, 17 toward first flow guide structure 20 along flow direction 34 (see...). Figures 2 to 8 ).

[0080] The internal conveying device 15 is rotatably supported on the first outer circumferential surface 25 of the centering element 19, wherein the second flow guiding structure 26 for connecting the pressure tube 24 and the first flow guiding structure 20 is constructed on the first outer circumferential surface 25.

[0081] The housing 6 has a suction pipe 27 connected to the suction side 4 at the second end side 22 of the rotor 8, which is arranged opposite to the first end side 9, wherein fluid is allowed to leak from the first guide structure 20 through the second outer circumferential surface 28 of the rotor 8 toward the suction pipe 27.

[0082] Fluid 18 originates from pressure pipe 24, passes through centering element 19 and second guide structure 26, and, if necessary, through conveying profiles 13, 17, and is conveyed to the first end side 9 of rotor 8 (see...). Figures 2 to 8 Then fluid 18 is conveyed outward along the gap 21 between the first end side 9 and the stator 7, and at least in the radial direction 14, through the gap 21 and as a leak exiting through the gap 21 (see...). Figure 2 (3, 7, and 8). Fluid 18 leaks and then flows via the second outer circumferential surface 28 of rotor 8 (i.e., between housing 6 and rotor 8) toward the second end side 22 and toward the suction side 4 located there (see 3, 7, and 8). Figure 2 and Figure 8 )flow.

[0083] exist Figure 2 The rotor 8 and the external conveying device 11 shown are implemented together as a single piece and in accordance with the present invention.

[0084] In the rest (not according to the invention only for this purpose), Figure 1 and 3 In rotor 8, the rotor 8 includes two components connected to each other via a connection that functions in a shape-fitting manner in a relative peripheral direction 35. One component of rotor 8 forms a first end side 9 and includes a magnet 33, while the other component includes an external conveying device 11.

[0085] At least during the operation of pump assembly 1, the rotating components (rotor 8, including external conveying device 11 and internal conveying device 15) of pump assembly 1 are arranged without contact with the stationary components (housing 6, stator 7, centering element 19) of pump assembly 1. Therefore, all rotating components are moved in the fluid 18. The fluid 18 prevents contact between the rotating components of pump assembly 1 and the stationary components of pump assembly 1, or ensures a contactless arrangement.

[0086] List of reference numerals

[0087] 1 Pump Assembly

[0088] 2 pumps

[0089] 3. Pressure side

[0090] 4. Inhalation side

[0091] 5 drive units

[0092] 6 shells

[0093] 7 stators

[0094] 8 rotors

[0095] 9 First end side

[0096] 10 Axial Directions

[0097] 11 External Conveying Devices

[0098] 12 inner circumferential surfaces

[0099] 13 First Conveying Profile

[0100] 14 Radial direction

[0101] 15 Internal conveying devices

[0102] 16 outer circumferential surfaces

[0103] 17 Second Conveying Profile

[0104] 18 fluids

[0105] 19 centering elements

[0106] 20 First flow guiding structure

[0107] 21 gap

[0108] 22 Second end side

[0109] 23 width

[0110] 24 pressure tube

[0111] 25 First outer circumference

[0112] 26 Second flow guiding structure

[0113] 27 Inhalation tube

[0114] 28 Second outer circumferential surface

[0115] 29 First axis of rotation

[0116] 30 Second rotation axis

[0117] 31 windings

[0118] 32-core

[0119] 33 magnets

[0120] 34 Flow Direction

[0121] 35-degree perimeter direction

Claims

1. A pump assembly (1), comprising at least a pump (2) having a pressure side (3) and a suction side (4) and a drive unit (5) for said pump (2), arranged in a common housing (6), wherein, The drive unit (5) is an axial-flow electric actuator, comprising a stator (7) anti-rotatably connected to the housing (6) and a rotor (8) rotatably arranged relative to the housing (6). The rotor (8) is arranged opposite to the stator (7) along the axial direction (10) with a first end side (9) and constitutes the external conveying device (11) of the pump (2), and has a first conveying profile (13) on the inner circumferential surface (12). An internal conveying device (15) of the pump (2) is arranged in the rotor (8) in the radial direction (14), and has a second conveying profile (17) on the outer circumferential surface (16), which works together with the first conveying profile (13) for conveying fluid (18). The internal conveying device (15) is supported on the housing (6) anti-rotatably connected to the housing (6). On the centering element (19); wherein at least the rotor (8) and the external conveying device (11) are configured to be supported only by fluid (18) conveyed through the pump (2); wherein at least between the first end side (9) and the stator (7) a first flow guide structure (20) is arranged and connected to the pressure side (3), such that a gap (21) between the first end side (9) and the stator (7) can be generated by the fluid (18) during operation of the electric drive, wherein the rotor (8) extends through a width (23) in the axial direction (10) between the first end side (9) facing the stator (7) and the second end side (22) arranged opposite to it, wherein the first conveying profile (13) and the second conveying profile (17) extend through the width (23) respectively.

2. The pump assembly (1) according to claim 1, wherein, The second conveying profile (17) works together with the first conveying profile (13) to drive the internal conveying device (15), wherein the internal conveying device (15) is rotatably supported on the centering element (19); wherein the internal conveying device (15) is also supported only by the fluid (18) conveyed through the pump (2).

3. The pump assembly (1) according to claim 1, wherein, The housing (6) has a pressure tube (24) connected to the pressure side (3) at a second end side (22) of the rotor (8) that is disposed opposite to the first end side (9), wherein the first flow guiding structure (20) is connected to the pressure tube (24) via the centering element (19).

4. The pump assembly (1) according to claim 3, wherein, The internal conveying device (15) is rotatably supported on the first outer circumferential surface (25) of the centering element (19), wherein the second flow guiding structure (26) for connecting the pressure tube (24) and the first flow guiding structure (20) is at least partially constructed on the first outer circumferential surface (25).

5. The pump assembly (1) according to any one of claims 1-4, wherein, The housing (6) has a suction pipe (27) connected to the suction side (4) at a second end side (22) of the rotor (8) that is disposed opposite to the first end side (9), wherein the fluid leaks from the first flow guide structure (20) toward the suction pipe (27) via the second outer circumferential surface (28) of the rotor (8).

6. The pump assembly (1) according to any one of claims 1-4, wherein, The rotor (8) and the external conveying device (11) are implemented as a single unit.

7. The pump assembly (1) according to any one of claims 1-4, wherein, At least during the operation of the pump assembly (1), the rotating members (8, 11, 15) of the pump assembly (1) are arranged without contact with the fixed members (6, 7, 19) of the pump assembly (1).

8. The pump assembly (1) according to any one of claims 1-4, wherein, At least the rotor (8) is manufactured using powder metallurgy.

9. The pump assembly (1) according to any one of claims 1-4, wherein, The pump (2) - It is a cycloidal pump or an internal gear pump, wherein the first delivery profile (13) is a first engagement portion and the second delivery profile (17) is a second engagement portion, wherein the engagement portions have different numbers of teeth from each other; or - It is a vane pump or roller vane pump; Furthermore, the first rotation axis (29) of the rotor (8) and the second rotation axis (30) of the internal conveying device (15) are arranged parallel to each other and spaced apart from each other in the radial direction (14).

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