Rotor and liquid pump for it

Abstract

Rotor for a liquid pump (100), characterized in that the rotor comprises at least one bearing, a magnetic guide ring (34) located radially outside the at least one bearing, an injection-molded rotor holder (341) integrally connected with the at least one bearing and the magnetic guide ring (343), permanent magnets (345) located on an outer circumference of the magnetic guide ring (343), and a protective casing (346) enclosing an outer circumference of the permanent magnets (345), wherein the rotor holder (341) comprises a tubular main body section (3411) and a plurality of retaining sections (3412) enclosing the main body section (3411) and spaced apart in a circumferential direction, wherein the main body section (3411) is injection-molded between the at least one bearing and the magnetic guide ring (343), and wherein the magnetic guide ring (343) extends radially between the main body section (3411) and the stopping areas (3412),wherein the permanent magnets (345) are each held in spaces between adjacent holding areas (3412) and wherein the thickness of the protective sheathing (346) is less than 0.8 millimeters.

Description

TECHNICAL AREA

[0001] The present invention relates to a liquid pump, in particular a rotor for the liquid pump. BACKGROUND OF THE INVENTION

[0002] Liquid pumps are characteristically connected in pipes to transport liquids such as water and coolant. A liquid pump typically has an impeller and a motor that drives the impeller to rotate, with the motor's rotor connected to the impeller for synchronous rotation.

[0003] In existing liquid pumps, the rotor typically has a tubular plastic housing, with the outer circumference of the rotor's permanent magnets being overmolded. In a rotor designed in this way, the overmolding with the plastic housing results in a relatively large thickness and thus a large air gap between the stator and the rotor of the motor, consequently reducing the motor's power density. SUMMARY OF THE INVENTION

[0004] Against this background, a rotor and a liquid pump for the rotor are provided in such a way that a higher power density of the motor is enabled.

[0005] A rotor for a liquid pump comprises at least one bearing, a magnetic guide ring located radially outside the at least one bearing, an injection-molded rotor holder integrally connected to the at least one bearing and the magnetic guide ring, permanent magnets arranged on an outer circumference of the magnetic guide ring, and a protective casing enclosing the outer circumference of the permanent magnets, wherein the rotor holder has a tubular main body area and a plurality of retaining areas surrounding the main body area and spaced apart in a circumferential direction, wherein the main body area between the at least one bearing and the magnetic guide ring is injection-molded, wherein the magnetic guide ring is located radially between the main body area and the retaining areas, and the permanent magnets are each held in spaces between adjacent retaining areas, and the thickness of the protective casing is less than 0.8 millimeters.

[0006] The rotor may exhibit one or more of the following aspects, alone or in combination.

[0007] Preferably, the at least one bearing comprises two axially spaced bearings and a bearing support element arranged between the two bearings.

[0008] Preferably, the rotor further comprises an impeller, wherein the impeller is formed separately and attached to an axial end of the rotor mount.

[0009] Preferably the rotor further comprises an impeller, the rotor mount further comprises an impeller base plate, and the impeller base plate is located at an axial end of the main body area of ​​the rotor mount.

[0010] Preferably, the rotor mount further comprises a plurality of wings that are integrally injection-molded onto the impeller base plate.

[0011] Preferably, the impeller comprises a cover plate, a plurality of vanes integrally formed on the cover plate, wherein the cover plate or the vanes are attached to the impeller base plate.

[0012] Preferably, the rotor further comprises an impeller, the main body area of ​​the rotor holder projects radially outwards at an end axially remote from the impeller to form a projection, the projection having at least two positioning structures for the magnetic guide ring, the at least two magnetic guide ring positioning structures being positioning grooves or positioning holes that extend axially through the projection to position the magnetic guide ring through the positioning grooves or positioning holes during the injection molding of the rotor holder.

[0013] Preferably, the rotor further comprises an impeller, the main body area of ​​the rotor holder projects radially outwards at an end axially remote from the impeller to form a projection, the projection extending at least partially in an axial direction beyond the protective casing, so that the projection provides magnetization positioning marks for the magnetization of the permanent magnets.

[0014] Preferably, the rotor further comprises an impeller, the main body area of ​​the rotor holder extends radially outwards to form an annular extension, the annular extension being located axially between the impeller and an end of the rotor farther from the impeller, and the annular extension being axially closer to the impeller and being integrally connected to an axial end of the holding areas.

[0015] Preferably, the main body area of ​​the rotor holder projects radially outwards at an end axially remote from the impeller to form a projection, wherein an outer diameter of the projection is less than or equal to an outer diameter of the magnetic guide ring, wherein the magnetic guide ring is located axially between the projection and the annular extension, and the other axial end of the holding areas is integrally connected to the projection.

[0016] Preferably, the projection is an annular projection extending in the circumferential direction.

[0017] Preferably, a tubular axial connection area is connected between the annular extension and the impeller base plate, and an outer diameter of the axial connection area is larger than an outer diameter of the main body area and smaller than an outer diameter of the annular extension.

[0018] Preferably, the protective casing comprises a cylinder and two annular rims extending radially inwards from both cylinder ends, wherein the cylinder encloses the permanent magnets and one annular rim rests axially against the annular extension of the rotor holder and the other annular rim rests axially against the permanent magnets.

[0019] Preferably, the magnetic conduction ring is a tubular structure formed by rolling a magnetically conductive sheet, wherein there is an axial gap between the beginning and the end of the magnetically conductive sheet and the main body area of ​​the rotor holder has an axial projection at a position corresponding to the axial gap.

[0020] Preferably, each holding area has a separation area and fastening areas extending circumferentially on both sides from a radially outer side of the separation area, wherein the separation area is located between adjacent permanent magnets and the fastening areas of the holding areas wrap around a portion of the outer circumferential surfaces of the permanent magnets, thereby provisionally positioning the permanent magnets on the rotor holder to facilitate the assembly of the protective casing.

[0021] Preferably, the permanent magnets are made of ferrite, and the protective casing is made of metal.

[0022] In a liquid pump comprising a stator and the rotor described above, a motor shaft is fixedly arranged in the liquid pump and at least one bearing of the rotor is rotatably mounted on the motor shaft.

[0023] Unlike the prior art, in the rotor and the liquid pump according to the invention, the rotor holder is injection-molded and rigidly connected to the bearing and the magnetic guide ring. The rotor holder also forms a plurality of retaining areas for holding the permanent magnets. The permanent magnets are attached to the outer circumference of the magnetic guide ring. The protective casing is formed separately and then mounted onto the permanent magnets. The thickness of the protective casing can be reduced to less than 0.8 millimeters, thereby effectively reducing the air gap between the stator and the rotor and improving the power density of the motor. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows a schematic representation of the structure of a liquid pump according to an embodiment of the present invention; Fig. Figure 2 shows an axial sectional view of the in Fig. 1 liquid pump shown; Fig. Figure 3 shows an exploded view of the in Fig. 1 liquid pump shown; Fig. Figure 4 shows a schematic representation of the structure of a rotor of the in Fig. 3 liquid pump shown; Fig. Figure 5 shows another exploded view of the in Fig. 4 rotors shown; Fig. 6 shows the view of Fig. 5 from a different angle; Fig. Figure 7 shows another exploded view of a rotor mount, a bearing assembly, and a magnetic guide ring of the [unclear] Fig. 6 rotors shown; Fig. Figure 8 shows a sectional view of the in Fig. 4 rotors shown; Fig. Figure 9 shows a sectional view of the in Fig. 4 rotors shown from a different angle. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0024] For a better understanding of the present invention, a detailed description follows with reference to the accompanying drawings. The drawings illustrate by way of example one or more embodiments of the invention, by means of which the technical solutions are presented precisely and comprehensively. It is understood, however, that the present invention can be implemented in various ways and is not limited to the embodiments described below.

[0025] Identical or similar reference numerals used in the drawings denote identical or similar elements. Terms such as "above," "below," "left," and "right" serve as an indication of positional or directional relationships based on the orientations or positions shown in the drawings and are intended solely to facilitate the description of the invention. They do not imply that the depicted elements to which reference is made must have a specific orientation or be constructed or operated in a particular orientation. Thus, the terminology used serves only illustrative and explanatory purposes and does not constitute a limitation of the invention. The specific meaning of these terms is familiar to those skilled in the art in the relevant field.

[0026] If terms such as "first," "second," etc., are used in this description, they serve only illustrative purposes and should not be interpreted as indicating relative importance or as specifying the quantity of the technical characteristics mentioned. Thus, characteristics defined as "first," "second," etc., can explicitly or implicitly include at least one such characteristic. The phrase "and / or," if used in the description, signifies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or both A and B.

[0027] Furthermore, the technical solutions of different embodiments can be combined, provided that such combinations are feasible for a person skilled in the art. If a combination leads to contradictions or is not feasible, it should be taken into account that such a combination does not exist and is not within the claimed scope of protection of the present invention.

[0028] The present invention provides a liquid pump used to drive liquids flowing in pipes, such as water and coolant. The liquid pump can be a coolant pump for vehicles. Fig. Figures 1 to 3 show a specific embodiment of the liquid pump according to the invention, wherein the illustrated liquid pump 100 comprises a pump housing 10, an impeller 20 arranged in the pump housing 10, and a motor 30 for rotating the impeller 20 in the pump housing 10. The motor 30 has a motor stator 32 and a motor rotor 34, which can rotate relative to the motor stator 32. The motor rotor 34 is connected to the impeller 20 and rotates together with the impeller 20. The motor rotor 34 and the impeller 20 are considered to be the rotor of the liquid pump 100.

[0029] In Fig. Figure 4, which is the subject of this discussion, shows that the impeller 20 has an overall disc-shaped structure and is rotatably mounted in the center of the pump housing 10. Accordingly, the pump housing 10 is provided with an inlet 12 and an outlet 14 for connecting its interior to external lines that form a flow path for the liquid.

[0030] As in Fig. As shown in Figure 5, the impeller 20 has a base plate 22 and a cover plate 24 spaced apart from the base plate 22, and a plurality of blades 26 arranged between the base plate 22 and the cover plate 24. The blades 26 and the base plate 22 are a single-piece injection-molded structure. The cover plate 24, on the other hand, is formed separately and then connected to the blades 26 by means of a snap-fit ​​connection, welding, bonding, or other methods. In other embodiments, the cover plate 24 can also be permanently connected to the base plate 22. In other embodiments, the blades can also be integrally formed on the cover plate 24, with the blades 26 or the cover plate 24 being attached to the base plate 22.

[0031] As the Fig. 2 and Fig. As shown in Figure 3, the motor 30 is preferably an internal rotor motor, wherein the motor rotor 34 is rotatably arranged in the center of the motor stator 32. A motor shaft 40 is fixedly arranged in the fluid pump 100. The motor rotor 34 and the impeller 20 are rotatably mounted on the motor shaft 40. When the motor 30 is activated, the motor rotor 34 and the impeller 20 rotate about the motor shaft 40.

[0032] As in the Fig. As shown in Figures 5 to 9, the rotor of the liquid pump has a bearing arrangement 342, a magnetic guide ring 343 located radially outside the bearing arrangement 342, an injection-molded rotor holder 341 integrally connected with the bearing arrangement 342 and the magnetic guide ring 342, permanent magnets 345 arranged on an outer circumference of the magnetic guide ring 343, and a protective sheath 346 encased on an outer circumference of the permanent magnets 345. The motor shaft 40 is inserted into the bearing arrangement 342.

[0033] The bearing holder 341 is manufactured by injection molding and has a tubular main body section 3411, a plurality of retaining sections 3412 that enclose the main body section 3411, and a base plate 22 of the impeller 20, which is located at an axial end of the main body section 3411. The main body section 3411 is injection molded between the bearing assembly 342 and the magnetic guide ring 343. The magnetic guide ring 343 is arranged radially between the main body section 3411 and the retaining sections 3412. The retaining sections 3412 are distributed approximately uniformly in a circumferential direction and form gaps between adjacent retaining sections 3412 for receiving the permanent magnets 345.

[0034] Preferably, each holding area 3412 has a generally T-shaped cross-section with a separating area 3412a and with fastening areas 3412b extending circumferentially on both sides from a radially outer side of the separating area 3412a. The separating area 3412a is positioned between adjacent permanent magnets 345. The fastening areas 3412 enclose a portion of the outer circumferential surfaces of the permanent magnets 345, thereby provisionally positioning the permanent magnets 345 on the rotor holder 341, thus facilitating the assembly of the protective casing 346.

[0035] Preferably, the main body section 3411 extends radially outwards to form an annular extension 3415, which is positioned axially between the base plate 22 of the impeller 20 and the other end of the rotor, and is axially closer to the base plate 22 of the impeller 20. The annular extension 3415 is integrally connected to one end of the retaining sections 3412. More preferably, the outer diameter of the annular extension 3415 of the rotor holder 341 is comparable to the outer diameter of an outer circumferential surface of a cylinder on which the permanent magnets 345 are located, thereby ensuring axial positioning of the permanent magnets 345 during assembly.

[0036] Preferably, a tubular axial connection area 3414 is integrally connected between the annular extension 3415 and the base plate 22 of the impeller 20. More preferably, the outer diameter of the axial connection area 3414 is larger than the outer diameter of the main body area 3411 and smaller than the outer diameter of the annular extension 3415.

[0037] Preferably, an end of the main body region 3411 located axially away from the impeller 20, i.e., the other axial end of the main body region 3411, projects radially outward to form an annular projection 3416. The outer diameter of the annular projection 3416 is less than or equal to the outer diameter of the magnetic conduction ring 343. The magnetic conduction ring 343 is arranged axially between the annular projection 3416 and the annular extension 3415. The other axial end of the retaining regions 3412 is integrally connected to the annular projection 3416.

[0038] Preferably, the annular projection 3416 is configured with at least two magnetic guide ring positioning structures 3418. The structures 3418 are positioning grooves or holes that extend axially through the annular projection 3416 and are used to position the magnetic guide ring 343 via the positioning grooves or holes during the injection molding of the rotor holder 341. In the illustrated embodiment, an outer circumferential wall of the annular projection 3416 is recessed to form magnetic guide ring positioning grooves.

[0039] Preferably, after the protective covering 346 has been mounted, the annular projection 3416 extends outwards in the axial direction over a certain length relative to the protective covering 346, so that the annular projection 3416 provides a magnetization positioning mark for the magnetization of the permanent magnets 345.

[0040] In this embodiment, at least one magnetization positioning mark 3417 is formed on an axial end face of the annular projection 3416 for magnetizing the permanent magnets 345 after the protective casing 346 has been mounted. Preferably, the annular projection 3416 comprises a plurality of magnetization positioning marks 3417, which are positioning recesses or projections, preferably positioning holes, extending axially through the annular projection 3416 to further position the magnetic guide ring 343 during the injection molding of the rotor holder 341. In the illustrated embodiment, the magnetization positioning marks 3417 and the magnetic guide ring positioning structures 3418 are distributed alternately in the circumferential direction.In other embodiments, at least two magnetic conduction ring positioning structures 3418 can simultaneously serve as magnetization positioning markers on the annular projection 3416, thereby eliminating the need for a separate formation of the at least one magnetization positioning marker 3417.

[0041] The bearing assembly 342 is integrally mounted in the main body section 3411 of the rotor mount 341 and comprises a bearing support element 3422, a first bearing 3424, and a second bearing 3426 located at both ends of the support element 3422. The first bearing 3424 and the second bearing 3426 are coaxially spaced, with the first bearing 3424 located at an upper end of the main body section 3411 and the second bearing 3426 at a lower end of the main body section 3411, thereby effectively supporting both ends of the motor shaft 40. In other embodiments, the bearing assembly 342 can also be replaced by a single bearing with a greater axial length to effectively support the motor shaft 40.

[0042] The first bearing 3424, the second bearing 3426, and the bearing support element 3422 are placed together in a mold and integrally joined to the rotor holder 341 during injection molding. Preferably, the inner diameter of the bearing support element 3422 is larger than the inner diameter of the first bearing 3424 and the inner diameter of the second bearing 3426, thus enabling a clearance fit between the bearing support element 3422 and the motor shaft after assembly.

[0043] Preferably, the outer circumferential walls of the first bearing 3424 and the second bearing 3426 have projections 3428, and during the forming of the rotor holder 341, corresponding recesses 3419 are formed in the main body area 3411 for these projections 3428. This design improves the stability of the connection between the first bearing 3424, the second bearing 3426 and the main body area 3411.

[0044] In other embodiments, during the forming of the rotor holder 341, recesses can also be formed on the outer circumferential walls of the bearings 3424 and 3426, and corresponding projections on the main body area 3411. This design also improves the stability of the connection between the bearings 3424, 3426 and the rotor holder 341.

[0045] The magnetic conduction ring 343 is tubular and has high magnetic permeability. In this embodiment, the magnetic conduction ring 343 is a tubular structure formed by rolling a magnetically conductive sheet, with an axial gap 3430 between a front end and a rear end of the magnetically conductive sheet. An axial projection 3413 is formed on the main body region 3411 of the rotor support 341 at a position corresponding to the axial gap 3430 to improve the stability of their connection. In other embodiments, the magnetic conduction ring 343 can also be formed by layering a plurality of magnetically conductive sheets, such as the lamellae of a motor rotor formed from silicon steel sheets. An outer circumference of the motor rotor lamellae can form a plurality of slots spaced circumferentially.During the injection molding of the rotor holder 341, the retaining areas 3412 of the rotor holder 341 are embedded in the slots to increase the stability of their connection. In the present invention, the magnetic guide ring 343 and the bearing arrangement 342 are placed together in a mold to form the rotor holder 341 and to fix both the magnetic guide ring 343 and the bearing arrangement 342 in a single injection molding operation.

[0046] In the described embodiment, the rotor mount 341 includes the base plate 22 of the impeller 20. In other embodiments, the rotor mount 341 and the impeller 20 can be formed separately and then permanently joined together by hot melting. In this case, the rotor mount 341 no longer includes the base plate 22 of the impeller 20. Instead, the base plate 22 is formed separately and then attached to an axial end of the rotor mount 341 by a process such as hot melting.

[0047] In the above embodiment, a tubular axial connection area 3414 is formed integrally between the annular extension 3415 and the base plate 22 of the impeller 20. In other embodiments, where the rotor mount 341 and the impeller 20 are formed separately, the axial connection area 3424 can be formed onto an axial end of the annular extension 3415 and then connected to the base plate 22 of the impeller 20, or formed onto the base plate 22 of the impeller 20 and then connected to an axial end of the annular extension 3415, or formed separately and then connected to both the annular extension 3415 and the base plate 22.

[0048] A method for manufacturing the rotor of the liquid pump according to the invention comprises the following steps: Step 1): Providing at least one bearing and one magnetic conduction ring 343 and placing the bearing and the magnetic conduction ring in a mold, wherein the magnetic conduction ring 343 surrounds the at least one bearing and is radially spaced from the at least one bearing; Step 2): Injection molding of the rotor holder 341, comprising a tubular main body area 3411, a plurality of retaining areas 3412 enclosing the main body area 3411 and spaced apart circumferentially, and a base plate 22 of an impeller 20 at an axial end of the main body area 3411, wherein the main body area 3411 is injection molded between the at least one bearing and the magnetic guide ring 343, the magnetic guide ring 343 being located radially between the main body area 3411 and the retaining areas 3412; Step 3): Providing a plurality of permanent magnets 345 and mounting them in spaces between adjacent holding areas 3412 of the rotor holder 341, wherein the permanent magnets 345 are located on an outer circumference of the magnetic guide ring 343; and Step 4): Providing a protective casing 346 and attaching the protective casing 346 to an outer circumference of the permanent magnets 345.

[0049] Preferably, the at least one bearing comprises a bearing support element 3422 and a first bearing 3424 and a second bearing 3426, which are located at both ends of the bearing support element 3422. Preferably, in the aforementioned step 2), several vanes 26 are cast onto the base plate 22 of the impeller 20.

[0050] In the aforementioned step 2), an axial end of the rotor mount 341 is formed with the base plate 22 of the impeller 20. In other embodiments, the rotor mount 341 and the impeller 20 can be formed separately and then joined to one another by means such as hot melting. In this case, the rotor mount 341 no longer includes the base plate 22 of the impeller 20 in the aforementioned step 2). Instead, the base plate 22 is formed separately and then attached to an axial end of the rotor mount 341 by means such as hot melting.

[0051] Preferably, in the aforementioned step 2), the main body section 3411 extends radially outwards to form an annular extension 3415, which is positioned axially between the base plate 22 of the impeller 20 and the other end of the rotor and is located closer to the base plate 22 of the impeller 20 in the axial direction. The annular extension 3415 is rigidly connected to an axial end of the retaining sections 3412. Preferably, the outer diameter of the annular extension 3415 of the rotor holder 341 is comparable to the outer diameter of an outer circumferential surface of a cylinder on which the permanent magnets 345 are located, thereby ensuring axial positioning of the permanent magnets 345 during assembly. Preferably, a tubular axial connection section 3414 is integrally connected between the annular extension 3415 and the base plate 22 of the impeller 20.It is further preferred that the outer diameter of the axial connection area 3414 is larger than the outer diameter of the main body area 3411 and smaller than the outer diameter of the annular extension 3415.

[0052] Preferably, in the aforementioned step 2), an end of the main body region 3411 axially distant from the impeller 20, i.e., the other axial end of the main body region 3411, extends radially outward to form an annular projection 3416. The outer diameter of the annular projection 3416 is less than or equal to the outer diameter of the magnetic conduction ring 343. The magnetic conduction ring 343 is located axially between the annular projection 3416 and the annular extension 3415. Both axial ends of the retaining regions 3412 are rigidly connected to the annular projection 3416 and the annular extension 3415, respectively.

[0053] Preferably, in the aforementioned step 2), at least two magnetic conduction ring positioning structures 3418 are formed for positioning the magnetic conduction ring 343 during the injection molding of the rotor holder 341 on the annular projection 3416.

[0054] Preferably, in the aforementioned step 4), the annular projection 3416 extends at least partially axially beyond the protective covering 346, so that the annular projection 3416 provides magnetization positioning marks for the magnetization of the permanent magnets 345.

[0055] In other embodiments, the permanent magnets in the aforementioned step 2) can also be placed in such a way that the holding areas in step 2) are formed between the adjacent permanent magnets and step 3) is then omitted.

[0056] In contrast to the prior art, the protective casing 346 of the rotor of the liquid pump 100 is formed separately in the present invention and then attached to the permanent magnets 345. Compared to the plastic housing of the rotor, which in the prior art is formed by overmolding, the thickness of the protective casing can be controlled according to the invention such that it can be reduced by the separate formation, i.e., it can be less than 0.8 millimeters, thereby effectively reducing the air gap between the stator and the rotor and improving the power density of the motor.

[0057] Preferably, the permanent magnets 345 in the present invention are inexpensive permanent magnets made of ferrite. The protective casing 346 consists of non-magnetic or weakly magnetic materials, preferably metal, which has high strength and allows for a reduced thickness, thereby further reducing the air gap of the motor 30. Preferably, the protective casing 346 comprises a cylinder 3462, and a first annular rim 3464 and a second annular rim 3466 extend radially inward from both ends of the cylinder 3462. The cylinder 3462 encloses the permanent magnets 345. The first annular rim 3464 lies outside the annular extension 3415 of the rotor holder 341 and rests axially against the annular extension 3415. The second annular rim 3466 is positioned at one end of the permanent magnets 345 and rests axially against the permanent magnets.The inner diameter of the second annular rim 3466 is not smaller than the outer diameter of the annular projection 3416, allowing the annular projection 3416 to extend outwards from the center of the second annular rim 3466 after assembly.

[0058] As the Fig. 2 and Fig.As shown in Figure 3, the liquid pump 100 also includes a sleeve 50, which divides the interior of the liquid pump 100 into a first chamber 16 and a second chamber 18. The first chamber 16 is used for installing the impeller 20 and the motor rotor 34, while the second chamber 18 is used for installing the motor stator 32. In this way, the sleeve 50 divides the interior of the liquid pump 100 into dry and wet areas, with liquid flowing only in the first chamber and effectively preventing it from entering the second chamber 18 and compromising electrical safety, thus ensuring the operational safety of the liquid pump 100.

[0059] In particular, the sleeve 50 is a tubular structure with an open top and a closed bottom, and the pump housing 10 covers the open top end of the sleeve 50. The center of the bottom of the sleeve 50 forms a first shaft seat 52, and the center of the pump housing 10 can form a second shaft seat 11. A lower end of the motor shaft 40 is fixed in the first shaft seat 52, and an upper end of the motor shaft 40 is accommodated in the second shaft seat 11.

[0060] It should be noted that the foregoing embodiments merely represent the preferred embodiments of the present invention, the descriptions of which are specific and comprehensive, but are not to be regarded as limitations of the present disclosure. Furthermore, it should be noted that various modifications and improvements are possible for a person skilled in the art without departing from the inventive concept. For example, combinations of different features are possible in the various embodiments, all of which fall within the scope of protection of the present invention.

Claims

[1] Rotor for a liquid pump (100), characterized by, that the rotor comprises at least one bearing, a magnetic conduction ring (34) located radially outside the at least one bearing, an injection-molded rotor holder (341) integrally connected with the at least one bearing and the magnetic conduction ring (343), permanent magnets (345) located on an outer circumference of the magnetic conduction ring (343), and a protective casing (346) enclosing an outer circumference of the permanent magnets (345), wherein the rotor holder (341) comprises a tubular main body region (3411) and a plurality of retaining regions (3412) enclosing the main body region (3411) and spaced apart in a circumferential direction, wherein the main body region (3411) is injection-molded between the at least one bearing and the magnetic conduction ring (343), and wherein the magnetic conduction ring (343) extends radially between the main body region (3411) and the retaining regions (3412). is locatedwherein the permanent magnets (345) are each held in spaces between adjacent holding areas (3412) and wherein the thickness of the protective sheathing (346) is less than 0.8 millimeters. [2] Rotor for a liquid pump (100) according to claim 1, characterized by , that the at least one bearing comprises two axially spaced bearings (3424, 3426) and a bearing support element (3422) arranged between the two bearings. [3] Rotor for a liquid pump (100) according to claim 1, characterized by , that the rotor further comprises an impeller (20), wherein the impeller (20) is formed separately and is attached to an axial end of the rotor support (341). [4] Rotor for a liquid pump (100) according to claim 1, characterized by, that the rotor further comprises an impeller (20), the rotor mount (341) further comprises a base plate (22) of the impeller (20) and the base plate (22) of the impeller (20) is located at an axial end of the main body area (3411) of the rotor mount (341). [5] Rotor for a liquid pump (100) according to claim 4, characterized by , that the rotor mount further comprises a plurality of wings (26) which are integrally injection-molded onto the base plate (22) of the impeller (20). [6] Rotor for a liquid pump (100) according to claim 4, characterized by , that the impeller (20) comprises a cover plate (24), a plurality of wings (26) are integrally formed on the cover plate (24) and the cover plate (24) or the wings (26) are attached to the base plate (22) of the impeller (20). [7] Rotor for a liquid pump (100) according to claim 1, characterized by, that the rotor further comprises an impeller (20), the main body region (3411) of the rotor holder (341) projects radially outwards at an end remote from the impeller (20) to form a projection (3416), the projection (3416) having at least two magnetic conduction ring positioning structures (3418), the at least two magnetic conduction ring positioning structures (3418) being positioning grooves or positioning holes that extend axially through the projection (3416) to position the magnetic conduction ring (343) through the positioning grooves or the positioning openings during the injection molding of the rotor holder (341). [8] Rotor for a liquid pump (100) according to claim 1, characterized by, that the rotor further comprises an impeller (20), that the main body area (3411) of the rotor holder (341) projects radially outwards at an end remote from the impeller (20) to form a projection (3416), the projection (3416) extending at least partially beyond the protective sheathing (346) in an axial direction, so that the projection (3416) provides magnetization positioning marks (3417, 3418) for magnetizing the permanent magnets (345). [9] Rotor for a liquid pump (100) according to claim 1, characterized by, that the rotor further comprises an impeller (20), that the main body area (3411) of the rotor support (341) extends radially outwards to form an annular extension (3415), wherein the annular extension (3415) is located axially between the impeller (20) and an end of the rotor located away from the impeller (20), wherein the annular extension (3415) is located axially closer to the impeller (20) and is integrally connected to an axial end of the support areas (3412). [10] Rotor for a liquid pump (100) according to claim 9, characterized by, that the main body region (3411) of the rotor support (341) projects radially at an end axially remote from the impeller (20) to form a projection (3416), wherein an outer diameter of the projection (3416) is less than or equal to an outer diameter of the magnetic conduction ring (343), wherein the magnetic conduction ring (343) lies axially between the projection (3416) and the annular extension (3415), and wherein the other axial end of the support regions (3412) is integrally connected to the projection (3416). [11] Rotor for a liquid pump (100) according to one of claims 7 to 10, characterized by , that the projection (3416) is an annular projection extending in the circumferential direction. [12] Rotor for a liquid pump (100) according to claim 9, characterized by, that a tubular axial connection area (3414) is connected between the annular extension (3415) and the base plate (22) of the impeller (20), wherein an outer diameter of the axial connection area (3414) is larger than an outer diameter of the main body area (3411) and smaller than an outer diameter of the annular extension (3415). [13] Rotor for a liquid pump (100) according to claim 9, characterized by , that the protective casing (346) comprises a cylinder (3462) and two annular rims (3464, 3466) extending radially inwards from both ends of the cylinder (3462), wherein the cylinder (3462) encloses the permanent magnets (345) and one annular rim (3464) abuts the annular extension (3415) of the rotor holder (341) axially and the other annular rim (3466) abuts the permanent magnets (345) axially. [14] Rotor for a liquid pump (100) according to one of the preceding claims, characterized by, that the magnetic conduction ring (343) is a tubular structure formed by rolling a magnetically conductive sheet, wherein an axial gap (3430) is present between a beginning and an end of the magnetically conductive sheet, wherein the main body region (3411) of the rotor support (341) has an axial projection (3413) at a position corresponding to the axial gap (3430). [15] Rotor for a liquid pump (100) according to one of the preceding claims, characterized by, that each holding area (3412) comprises a separating area (3412a) and fastening areas (3412b) extending circumferentially on both sides from a radially outer side of the separating area (3412a), wherein the separating area (3412a) is located between two adjacent permanent magnets (345) and the fastening areas (3412b) of the holding areas (3412) enclose a portion of the outer circumferential surfaces of the permanent magnets (345) and thereby provisionally position the permanent magnets (345) on the rotor holder (341) to facilitate the assembly of the protective casing (346). [16] Rotor for a liquid pump (100) according to one of the preceding claims, characterized by , that the permanent magnets (345) are permanent magnets made of ferrite and the protective casing (346) is a protective casing made of metal. [17] Liquid pump (100), characterized by, that the liquid pump (100) comprises a stator (32) and a rotor for a liquid pump (100) according to one of claims 1 to 16, wherein a motor shaft (40) is fixedly arranged in the liquid pump (100) and encloses at least one bearing of the rotor shaft (40).

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