Magnetic coupling pump arrangement comprising a can, and method for producing the can

Abstract

The invention relates to a magnetically coupled pump assembly, comprising: an interior space (11) formed by a pump housing (2) of the pump assembly; a spacer tank (10) with a central longitudinal axis (B), said spacer tank tightly sealing a chamber (12) surrounded by the spacer tank from an interior space (11) formed by the housing (2); an impeller shaft (13) rotatably drivable about an axis of rotation (A); an impeller (16) arranged at one end of the impeller shaft (13); an inner rotor (17) arranged at the other end of the impeller shaft (13); and an outer rotor (24) arranged on the drive shaft (20) and interacting with the inner rotor (17). According to the invention, the outer peripheral surface (31) of the spacer tank (10) is provided with a plurality of projections (32, 32 ').

Description

(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202480047233.9 (22) Application Date 2024.07.03 (30) Priority Data 102023119071.7 2023.07.19 DE (85) PCT International Application Entering National Phase Date 2026.01.15 (86) PCT International Application Application Data PCT / EP2024 / 068679 2024.07.03 (87) PCT International Application Publication Data WO2025 / 016731 ​​DE 2025.01.23 (71) Applicant: KSB GmbH, Address: Frankenthal, Germany (72) Inventors: L. Buttmann, J. Engelbrecht, B. Janjik, S. Neusus, A. Rohde (74) Patent Agency: China Patent Agency (Hong Kong) Limited, 72001 Patent Attorneys: Wei Chengyang, Wang Lei (51) Int.Cl. F04D 13 / 02 (2006.01) B33Y 80 / 00 ​​(2006.01) F04D 29 / 02 (2006.01) (54) Title of Invention: Magnetic Coupled Pump Assembly with Spacer Tank and Method for Manufacturing Spacer Tank (57) Abstract: This invention relates to a magnetic coupled pump assembly comprising: an internal space (11) formed by a pump housing (2) of the pump assembly; a spacer tank (10) having a central longitudinal axis (B), the spacer tank sealing a chamber (12) surrounded by the spacer tank relative to the internal space (11) formed by the housing (2); an impeller shaft (13) rotatably driven about a rotation axis (A); an impeller (16) disposed at one end of the impeller shaft (13); an inner rotor (17) disposed at the other end of the impeller shaft (13); and an outer rotor (24) disposed at a drive shaft (20) and cooperating with the inner rotor (17). According to the invention, the outer peripheral surface (31) of the spacer tank (10) is provided with a plurality of protrusions (32, 32').Claims 2 pages, Description 5 pages, Drawings 9 pages, CN 121532568 A 2026.02.13 CN 1 21 53 25 68 A 1. A magnetically coupled pump assembly comprising: - an internal space (11) formed by a pump housing (2) of the pump assembly; - a spacer (10) having a central longitudinal axis (B), the spacer sealing a chamber (12) surrounded by the spacer relative to the internal space (11) formed by the pump housing (2); - an impeller shaft (13) rotatably driven about a rotation axis (A); - an impeller (16) disposed at one end of the impeller shaft (13); - an inner rotor (17) disposed at the other end of the impeller shaft (13); - an outer rotor (24) disposed at a drive shaft (20) and acting in conjunction with the inner rotor (17), characterized in that, 1. The outer peripheral surface (31) of the spacer tank (10) is provided with a plurality of protrusions (32, 32'). 2. The magnetic coupling pump assembly according to claim 1, wherein the outer peripheral surface (31) of the spacer tank (10) is provided with a plurality of protrusions (32, 32'), and the protrusions are at least partially inclined. 3. The magnetic coupling pump assembly according to claim 1 or 2, wherein a channel-shaped hollow space (35, 35') extends through the protrusions (32, 32'). 4. The magnetic coupling pump assembly according to claim 3, wherein the shape of the hollow space (35, 35') substantially corresponds to the shape of the protrusions (32, 32'), wherein the protrusions (32, 32') or the hollow space (35, 35') is constructed in a triangular, elliptical, circular, semi-elliptical, semi-circular, trapezoidal or other polygonal design. 5. The magnetic coupling pump assembly according to any one of the preceding claims, characterized in that the protrusion (32) is configured as a thread or a spiral. 6. The magnetic coupling pump assembly according to any one of the preceding claims, characterized in that the protrusion (32) is arranged obliquely relative to an imaginary line (L) extending parallel to the central longitudinal axis (B) on the outer peripheral surface (31), wherein the protrusion 32 and the line L enclose an angle (α) in the range of greater than 0° to less than 90°. 7. The magnetic coupling pump assembly according to claim 6, characterized in that the angle (α) is in the range of 30° to 70°. 8. The magnetic coupling pump assembly according to claim 6 or 7, characterized in that the angle (α) is 45°. 9. The magnetic coupling pump assembly according to any one of the preceding claims, characterized in that the obliquely extending protrusion (32) is interrupted by a plurality of protrusions (32') extending in the axial direction.10. The magnetically coupled pump assembly according to any one of the preceding claims, characterized in that a channel-shaped hollow space (35') extends through the axially extending protrusion (32'), the channel-shaped hollow space (35') communicating with the hollow space (35) of the obliquely extending protrusion (32). 11. The magnetically coupled pump assembly according to any one of the preceding claims, characterized in that the protrusion (32) has an axially extending section (38, 39) at at least one end region (36, 37). 12. The magnetically coupled pump assembly according to any one of the preceding claims, characterized in that the obliquely extending protrusion (32) extending between the axial sections undergoes a reversal of direction approximately at the center of the base (25), such that the protrusion (32) has a substantially mirror-symmetrical orientation. 13. A method for manufacturing a spacer tank for a magnetically coupled pump, characterized in that a plurality of protrusions (32, 32') are provided on the outer peripheral surface (31) of the spacer tank (10). 14. The method according to claim 13, characterized in that the spacer (10) is manufactured by selectively applying an energy beam to a layer of powder applied layer by layer to produce the spacer having the protrusion (32, 32') and the hollow space (35, 35'). Claims 2 / 2 Page 3 CN 121532568 A Magnetic Coupling Pump Assembly with Spacer Tank and Method for Manufacturing Spacer Tank Technical Field

[0001] The present invention relates to a magnetic coupling pump assembly having: an internal space formed by a pump housing of the pump assembly; a spacer tank (or isolation tank, i.e., spalttopf) with a central longitudinal axis, the spacer tank sealing the chamber surrounded by the spacer tank tightly relative to the internal space formed by the housing; an impeller shaft rotatably driven about a rotation axis; an impeller arranged at one end of the impeller shaft; an inner rotor arranged at the other end of the impeller shaft; and an outer rotor arranged at the drive shaft and acting in conjunction with the inner rotor. The invention also relates to a method for manufacturing the spacer tank of such a magnetic coupling pump assembly. Background Art

[0002] Such shaft-sealed pumps are particularly used for conveying hazardous or toxic media in order to eliminate leaks, because, depending on the medium, even small amounts of the conveyed medium can have life-threatening consequences.

[0003] In the case of shaftless pumps, especially magnetically coupled pumps, the spacer tank constitutes a weak point because it is implemented with the smallest possible wall thickness based on performance losses and torque transmission. A problem with conventional spacers is that the condition of the spacer tank cannot be monitored or can only be monitored in a limited way.For example, if impurities are present in the transported medium, the spacer tank may be worn through and potentially hazardous media may flow into the so-called lampshade-shaped component or the bearing housing of the outer rotor.

[0004] Typically, or in conventional solutions, a leak monitoring device in the form of a level gauge is placed in the area of ​​the lampshade-shaped component / bearing housing. The problem here is that at least the areas in the lampshade-shaped component and bearing housing are contaminated and pose a potential hazard. Furthermore, the possibility of the transported medium escaping through the support cannot be ruled out in this solution. Therefore, a secondary protective sleeve cannot be used.

[0005] The secondary protective sleeve is achieved, for example, by using a second spacer tank, which is mounted on top of the first spacer tank and statically sealed. The intermediate area between the spacer tanks can be monitored by using different sensors.

[0006] There are currently two variations in the use of a second spacer tank. It is known from EP0286822A2 to use a metal spacer tank as the primary protective sleeve combined with a ceramic spacer tank mounted on top of it as the secondary protective sleeve. The problem here is the resulting total thickness of the two spacer tanks, as the ceramic tank requires a higher wall thickness to withstand the pressure. In this variant, no additional eddy current losses are generated, but the problem is that the transmittable torque decreases compared to a single-walled spacer tank as the wall thickness increases. To compensate for this, a larger magnetic coupler must be installed, which, combined with the more expensive ceramic spacer tank, leads to high costs. Furthermore, ceramic is a brittle material that may suddenly fail under mechanical loads.

[0007] The second variant uses two spacer tanks assembled on top of each other, as known from WO2014 / 032816A1. Here, the resulting intermediate gap is monitored by means of a sensing device, as in the previous variant.

[0008] The problem here is that eddy currents are induced in the metal / conductive material / spacer tank due to magnetic coupling, which manifest as heat through the material resistance. The first negative aspect is increased eddy current losses and therefore lower pump efficiency. The second negative point is that the heat generated in the second spacer tank can only be transferred with difficulty or only to a limited extent to the inner spacer tank, where the heat is output to the transport medium. This causes the outer spacer to heat up further, which can lead to expansion and wear at the outer rotor. On the other hand, the high temperature limits the applicability of the magnetically coupled pump, as the high surface temperature negatively impacts explosion-proof safety (ATEX rating). For these reasons, double-walled spacers made of metal are classified as impractical and can only be used in limited ways.Specification 1 / 5 pages 4 CN 121532568 A

[0009] A solution to the previously listed problems is known from WO 2020 / 212250A1, in which a spacer for a magnetic coupler is provided with a columnar one-piece cover region and a bottom region connected at a first end of the cover region, wherein at least the cover region has an inner wall portion and an outer wall portion surrounding the inner wall portion, wherein the inner wall portion and the outer wall portion are spaced apart from each other in the radial direction by a gap, and the inner wall portion is integrally connected to the outer wall portion via a plurality of tabs. Summary of the Invention

[0010] The object of the present invention is now to provide a pump assembly, in particular a magnetic coupling pump assembly, in which eddy current losses within the spacer are minimized without reducing the stability of the spacer.

[0011] The object of the present invention is solved by providing a plurality of protrusions on the outer peripheral surface of the spacer (in particular the base and the bottom), thereby reducing eddy current losses and making the spacer less prone to intense heating.

[0012] It has proven particularly advantageous that the protrusions are at least partially inclined. Due to the inclined arrangement of the protrusions, the resulting losses and temperatures are further reduced.

[0013] In a further design, a channel-like hollow space extends through the protrusion, allowing the spacer located at the housing or at a component associated with the housing (e.g., a housing cover) to be inspected for leaks. These hollow spaces may have a defined internal pressure, i.e., positive or negative pressure. The hollow space may be under vacuum or filled with gas. If some portion of the protrusion is damaged, resulting in damage to the outside of the spacer, a sensor monitoring the hollow space detects that there is no longer a vacuum within the hollow space or that gas has escaped from the hollow space. In the case of damage to the inside of the spacer, the sensor detects that the channel is filled with the delivery medium. In both cases, pump shutdown can be performed.

[0014] Therefore, in both cases, the delivery medium has not escaped into the lampshade-shaped component area. This means a significantly improved level of safety for such magnetically coupled pump assemblies. The protrusions and hollow spaces extend both in the body area of ​​the spacer base and in the area at the bottom of the spacer.

[0015] Advantageously, the shape of the hollow space substantially corresponds to the shape of the protrusion, wherein the protrusion or hollow space can be constructed as a triangle, ellipse, circle, semi-ellipse, semi-circle, trapezoid, or have other polygonal designs. By adapting the appropriate geometry to the corresponding needs, the resulting losses and temperatures are significantly reduced.

[0016] The protrusion is constructed in a threaded or spiral shape relative to the centerline of the spacer tank in such a way that the protrusion is arranged obliquely relative to an imaginary line extending parallel to the central longitudinal axis of the spacer tank on the outer circumferential surface, wherein the protrusion and the line L enclose an angle greater than 0° to less than 90°, thereby allowing powdery material remaining in the hollow space during manufacturing to be removed from the channel.

[0017] Advantageously, this angle range is in the range of 30° to 70°.

[0018] It has been shown to be particularly advantageous that the enclosed angle is 40° to 55°. This reduces the weight of the spacer tank, reduces electromagnetic losses, and provides particularly good heat dissipation during operation.

[0019] In another advantageous design, the obliquely extending protrusion is interrupted by a plurality of axially extending protrusions, wherein a channel-like hollow space extends through the axial protrusions, the channel-like hollow space communicating with the hollow space of the obliquely extending protrusion. This further reduces electromechanical losses; moreover, during the manufacture of the spacer can, metal powder remaining in the channel-shaped hollow space during 3D printing can be easily removed from the channel.

[0020] In another advantageous design of the spacer, the protrusion has an axially extending section at at least one end region. The advantage here is that the hollow spaces in the base and bottom of the spacer can be better interconnected.

[0021] Here, in a particular design, the obliquely extending protrusions extending between the axial sections undergo a reversal of direction approximately at the center of the base, thus resulting in a substantially mirror-symmetrical orientation of the protrusions. The advantage here, as stated on pages 2 / 5 of the specification (CN 121532568 A), is that powder in the hollow space during manufacturing can be removed from the channel via a shorter path.

[0022] According to the method of the invention, the outer peripheral surface of the spacer is provided with a plurality of protrusions.

[0023] To achieve the defined and desired tissue structure, it is preferable to manufacture the spacer can by means of a method in which an energy beam is selectively applied to a layer of powder applied layer by layer to produce a spacer can with protrusions and hollow spaces.

[0024] Embodiments of the invention are shown in the accompanying drawings and are described in more detail below.Wherein: Figure 1 shows a longitudinal section of a magnetically coupled pump assembly according to the prior art; Figure 2 shows a three-dimensional illustration of a first embodiment of the spacer according to the invention in an enlarged view; Figure 3 shows a side view of the spacer according to the invention according to Figure 2; Figure 4 shows a section of the spacer according to the invention according to Figure 2; Figure 5 shows a section of the spacer according to the invention according to another embodiment of the spacer; Figure 6 shows a section of the spacer according to the invention according to another embodiment of the spacer; Figure 7 shows a side view of the spacer according to the invention according to another embodiment; Figure 8 shows a section of the spacer according to the invention according to Figure 7; Figure 9 shows a partial view of another embodiment of the spacer; Figure 10 shows a schematic diagram of another embodiment of the spacer according to the invention; Figure 11 shows a schematic diagram of another embodiment of the spacer according to the invention; Figure 12 shows a first view of the hollow space outline of the spacer according to Figure 1; Figure 13 shows a second view of the hollow space outline of the spacer according to Figure 1. Detailed Description

[0025] Figure 1 exemplarily shows a pump assembly 1 in the form of a magnetically coupled pump assembly as known in the prior art. The pump assembly 1 has a multi-piece pump housing 2 for a centrifugal pump, which includes a hydraulic housing 3 constructed as a helical shell, a housing cover 4, a bearing housing lampshade-shaped component 5, a bearing housing 6, and a bearing cover 7.

[0026] The hydraulic housing 3 has an inlet opening 8 for drawing in the conveying medium and an outlet opening 9 for discharging the conveying medium. The housing cover 4 is arranged on the side of the hydraulic housing 3 opposite to the inlet opening 8. The bearing housing lampshade-shaped component 5 is fixed on the side of the housing cover 4 away from the hydraulic housing 3. The bearing housing 6 is arranged on the side of the bearing housing lampshade-shaped component 5 opposite to the housing cover 4. The bearing cover 7 is fixed on the side of the bearing housing 6 away from the bearing housing lampshade-shaped component 5.

[0027] The spacer 10 is fixed on the side of the housing cover 4 away from the hydraulic housing 3 and extends at least partially through the internal space 11 defined by the pump housing 2, especially by the housing cover 4, the bearing housing lampshade-shaped component 5, and the bearing housing 6. The spacer 10 tightly seals the chamber 12 it surrounds relative to the internal space 11.

[0028] An impeller shaft 13, rotatable about a rotation axis A, extends from a flow chamber 14, defined by a hydraulic housing 3 and a housing cover 4, through an opening 15 provided in the housing cover 4, into the chamber 12.

[0029] An impeller 16 is fixed at the shaft end of the impeller shaft 13 located within the flow chamber 14, and an inner rotor 17 arranged within the chamber 12 is arranged at the opposite shaft end. The inner rotor 17 is equipped with a plurality of magnets 18 arranged on the side of the inner rotor 17 facing the spacer 10.

[0030] A bearing assembly 19 is arranged between the impeller 16 and the inner rotor 17, and is connected to the impeller shaft 13, which is rotatably driven about the rotation axis A, at page 3 / 5 of the specification, CN 121532568 A.

[0031] A drive motor (preferably an electric motor), not shown, drives the drive shaft 20. The drive shaft 20, which is rotatably driven about the rotation axis A, is arranged substantially coaxially with the impeller shaft 13. The drive shaft 20 extends through the bearing cover 7 and the bearing housing 6 and is supported by two ball bearings 21, 22 disposed in the bearing housing 6. An outer rotor 24 carrying a plurality of magnets 23 is arranged at the free end of the drive shaft 20. The magnets 23 are arranged on the side of the outer rotor 24 facing the spacer tank 10. The outer rotor 24 extends at least partially over the spacer tank 10 and works in conjunction with the inner rotor 17, such that the rotating outer rotor 24, by means of magnetic force, also puts the inner rotor 17 into rotational motion, and thus puts the impeller shaft 13 and the impeller 16 into rotational motion.

[0032] The spacer tank 10, shown enlarged in Figures 2 and 3, is configured for installation into the pump assembly 1, exemplarily shown in Figure 1, for various magnetically coupled pump assemblies. The spacer tank 10 has a generally columnar base 25 with a central longitudinal axis B arranged substantially coaxially with the axis of rotation A according to Figure 1. The base 25 is open on one side and closed on the opposite side by means of a generally arched bottom 26. An annular connecting flange 27 is arranged on the open side, which is integrally constructed with the base 25.

[0033] The connecting flange 27 has a plurality of holes 28 extending parallel to the central longitudinal axis B, through which threaded elements (not shown) can be plugged and screwed into corresponding threaded holes in the housing cover 4 according to Figure 1.

[0034] The bottom 26 is composed of a generally spherical fan-shaped truncated spherical region 29 and an outer edge region 30 forming a transition region between the base 25 and the truncated spherical region 29.

[0035] As can be seen in conjunction with Figures 3 and 4, the substrate 25 has an outer peripheral surface 31 with a plurality of protrusions 32. The outer peripheral surface 31 is substantially wavy, having a corresponding plurality of crests 33 and troughs 34. The protrusions 32 are configured in a threaded or spiral shape, that is, the protrusions 32 are arranged obliquely relative to an imaginary line L extending parallel to the central longitudinal axis B on the outer peripheral surface 31. In the illustrated embodiment, the protrusions 32 and the line L enclose an angle α of 45°. The angle α can move in a range greater than 0° up to less than 90°. Preferably, the angle α is in the range of 30° to 70°. A channel-like hollow space 35 extends through the protrusions 32.

[0036] Figure 4 shows a triangular protrusion 32 with a triangular hollow space 35; while Figure 5 shows an elliptical protrusion 32 with an elliptical hollow space 35, which is constructed on the outer peripheral surface 31 of the spacer tank 10. Other designs for the protrusion 32 are possible. These protrusions may have a semi-circular or semi-elliptical design, as shown in Figure 6, or they may have a trapezoidal or other polygonal design.

[0037] Figure 7, in conjunction with Figure 8, shows another embodiment of the spacer tank 10 for use in a magnetic coupling pump assembly. In the embodiment shown, the obliquely extending protrusion 32 constructed on the base 25 is interrupted by a plurality of protrusions 32' extending in an axial direction (i.e., parallel to the central longitudinal axis B). A channel-like hollow space 35' extends through the axial protrusions 32', and the hollow space communicates with the hollow space 35 of the obliquely extending protrusion 32. The design of the protrusion 32' can correspond to the design of the protrusion 32, however, it is also conceivable that the design of the protrusion 32 is different from that of the protrusion 32'.

[0038] Figure 9 shows another variant of the spacer tank 10. The inclined protrusion 32 extends from a protrusion 32' extending parallel to the central longitudinal axis B of the spacer tank 10 toward the next protrusion 32' extending parallel to the central longitudinal axis B of the spacer tank 10 at a specific angle α relative to an imaginary line L extending parallel to the central longitudinal axis B on the outer peripheral surface 31. Subsequent protrusions 32 extending from the protrusion 32' are arranged at an angle α' relative to the line L, the angle α' being substantially corresponding to 360°−α, thereby producing a herringbone-like design.

[0039] Figure 10 schematically shows another design of the protrusion 32 at the outer peripheral surface 31 of the spacer tank. The protrusion 32 may have axially extending (i.e., parallel to the axis of rotation A) sections 38 or 39 at at least one end region 36, 37, wherein these sections are also provided with channel-shaped hollow spaces as described in the foregoing figures. The shape of the protrusion or hollow space may be selected accordingly.

[0040] Another alternative design of the protrusion 32 is schematically shown in Figure 11. The obliquely extending protrusion 32, extending between the axial sections, undergoes a reversal of direction approximately at the center of the base 25, thus creating a substantially mirror-symmetrical orientation of the protrusion 32. Here, the axial sections 38, 39 of the protrusion 32 are substantially located in one plane. It can be seen that the axial sections may be omitted, and the protrusion 32 may have an oblique orientation from its beginning to its end relative to the imaginary line L shown in Figure 3.

[0041] The described embodiment shows that the spacer is constructed as a uniform component. It is manufactured using 3D printing methods.

[0042] FIG12, in conjunction with FIG13, shows the hollow space outline or orientation of the hollow space 35 in the spacer tank 10, particularly the surface of the hollow space according to FIG2 or FIG3. The metallic material is somewhat obscured. It can be seen that an annular space 40 is constructed on the side of the substrate 25 opposite to the open side, from which the hollow space 35 extends toward the open side and eventually leads into the first hollow space 41 or the second hollow space 42 of the semi-annular structure. A first connecting channel 43 extends from the first hollow space 41 of the semi-annular structure through the connecting flange 27 shown in FIG2. The first connecting channel 43 is also shown in FIG1. ​​A second connecting channel 44 extends from the second hollow space 42 of the semi-annular structure through the connecting flange 27.

[0043] As can be seen from FIG13, the first hollow space 41 of the semi-annular structure has a first ramp-shaped region with an inclined portion 45 and a second ramp-shaped region with an inclined portion 46, which converge at a point 47. The second hollow space 42 of the semi-annular structure has a first sloping region with an inclined portion 48 and a second sloping region with an inclined portion 49, which converge at a point 50.

[0044] When the open side of the spacer is oriented downwards, the first connecting channel 43 and the second connecting channel 44 are arranged at the lowest part of the hollow space 41 or the hollow space 42.

[0045] It is thus possible that loose powder remaining in the hollow spaces 35, 35', 40, 41 and 42 during 3D printing can flow out from these hollow spaces from the region of the bottom 26 via the region of the substrate 25 and via the region of the connecting flange 27 and finally via the first connecting channel 43 or the second connecting channel 44, or it can be removed from these hollow spaces by blowing.Instruction manual, page 5 / 5, 8 CN 121532568 A, Figure 1; Instruction manual, Figure 1 / 9, page 9, CN 121532568 A, Figure 2; Instruction manual, Figure 2 / 9, page 10, CN 121532568 A, Figure 3; Instruction manual, Figure 3 / 9, page 11, CN 121532568 A, Figure 4; Instruction manual, Figure 4 / 9, page 12, CN 121532568 A, Figure 6; Instruction manual, Figure 5 / 9, page 13, CN 121532568 A, Figure 7; Instruction manual, Figure 6 / 9, page 14, CN 121532568 A, Figure 9; Instruction manual, Figure 10; Instruction manual, Figure 7 / 9, page 15, CN 121532568 A, Figure 11; Instruction manual, Figure 12; Instruction manual, Figure 8 / 9, page 16, CN 121532568 A, Figure 13; Instruction manual, Figure 9 / 9, page 17, CN 121532568 A.

Claims

1. A magnetically coupled pump assembly, comprising: -The internal space (11) formed by the pump housing (2) of the pump assembly; - A spacer tank (10) with a central longitudinal axis (B) that tightly seals the chamber (12) surrounded by the spacer tank relative to the internal space (11) formed by the pump housing (2); - An impeller shaft (13) that can be rotatably driven about the axis of rotation (A); - An impeller (16) is arranged at one end of the impeller shaft (13); - An inner rotor (17) is arranged at the other end of the impeller shaft (13); - An outer rotor (24) arranged at the drive shaft (20) and acting in conjunction with the inner rotor (17), Its features are, The outer peripheral surface (31) of the spacer (10) is provided with a plurality of protrusions (32, 32').

2. The magnetic coupling pump assembly according to claim 1, characterized in that, The outer peripheral surface (31) of the spacer (10) is provided with a plurality of protrusions (32, 32'), and the protrusions are at least partially inclined.

3. The magnetic coupling pump assembly according to claim 1 or 2, characterized in that, A channel-shaped hollow space (35, 35') extends through the protrusion (32, 32').

4. The magnetic coupling pump assembly according to claim 3, characterized in that, The shape of the hollow space (35, 35') substantially corresponds to the shape of the protrusion (32, 32'), wherein the protrusion (32, 32') or the hollow space (35, 35') is constructed in the form of a triangle, ellipse, circle, semi-ellipse, semi-circle, trapezoid, or other polygonal design.

5. The magnetic coupling pump assembly according to any one of the preceding claims, characterized in that, The protrusion (32) is configured in a threaded or spiral shape.

6. The magnetic coupling pump assembly according to any one of the preceding claims, characterized in that, The protrusion (32) is arranged obliquely relative to an imaginary line (L) extending parallel to the central longitudinal axis (B) on the outer peripheral surface (31), wherein the protrusion 32 and the line L enclose an angle (α) in the range of greater than 0° and less than 90°.

7. The magnetic coupling pump assembly according to claim 6, characterized in that, The angle (α) is in the range of 30° to 70°.

8. The magnetically coupled pump assembly according to claim 6 or 7, characterized in that, The angle (α) is 45°.

9. The magnetic coupling pump assembly according to any one of the preceding claims, characterized in that, The inclined protrusion (32) is interrupted by a plurality of protrusions (32') extending in the axial direction.

10. The magnetic coupling pump assembly according to any one of the preceding claims, characterized in that, A channel-shaped hollow space (35') extends through the axial protrusion (32'), and the channel-shaped hollow space (35') communicates with the hollow space (35) of the inclined protrusion (32).

11. The magnetic coupling pump assembly according to any one of the preceding claims, characterized in that, The protrusion (32) has an axially extending section (38, 39) at at least one end region (36, 37).

12. The magnetic coupling pump assembly according to any one of the preceding claims, characterized in that, The protrusions (32) that extend obliquely between axial sections undergo a reversal of direction at approximately the center of the base (25), thus giving the protrusions (32) a substantially mirror-symmetrical orientation.

13. A method for manufacturing a spacer tank for a magnetically coupled pump, characterized in that, The outer peripheral surface (31) of the spacer (10) is provided with a plurality of protrusions (32, 32').

14. The method according to claim 13, characterized in that, The spacer can (10) is manufactured by selectively applying an energy beam to a layer of powder applied layer by layer, thereby producing the spacer can with the protrusions (32, 32') and the hollow space (35, 35').

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