CN212130816U - Detachable disk impeller rotor assembly and micro centrifugal pump using same - Google Patents

Abstract

The utility model provides a detachable disk impeller rotor subassembly, including the impeller and the disk motor permanent magnet rotor who is fixed in the impeller, the impeller includes annular back plate, be fixed in the blade of terminal surface before this back plate and the wheel hub of backward axial extension, wheel hub's center is equipped with the shaft hole that supplies the pivot to pass through, be equipped with the spacing portion that prevents permanent magnet rotor pivoted on the backward face of back plate, be equipped with the axial hole in this spacing portion, the coaxial positioning that back plate and permanent magnet rotor have mutual adaptation pairs the structure group, and both detachably assemble together. The utility model discloses a disk impeller rotor subassembly, disk motor permanent magnet rotor assemble in the impeller back plate for detachably, and this design shortens impeller rotor subassembly's axial dimensions, and simple structure, easy maintenance. When the impeller or the permanent magnet rotor is damaged, only the damaged part is disassembled and replaced, and the maintenance cost is favorably reduced.

Description

Detachable disk impeller rotor assembly and micro centrifugal pump using same

Technical Field

The utility model discloses the pump relates to the miniature centrifugal pump of using disk impeller rotor subassembly, and its IPC classification belongs to F04D 13/06 (2006.01).

Background

The disk rotor subassembly that uses in the existing market, its structure is like prior patent number CN104061169B, impeller rotor subassembly includes impeller and rotor subassembly, and the impeller includes the first limiting plate and the second limiting plate of rim plate main part, blade, impeller shaft, axial setting, and the rotor subassembly includes rotor magnetic core, magnetic shoe and with rotor magnetic core and magnetic shoe plastic envelope casing together. The rotor assembly is connected with the wheel disc main body through an impeller shaft between a first limiting plate and a second limiting plate which are arranged below the wheel disc main body in an injection molding mode.

The disc rotor assembly of this kind of structure is radial magnetic flux, and axial dimension is big, and the rotor magnetic core is in the plastic envelope casing of rotor for the plastic envelope, when impeller or magnetic core received the damage, need change whole disc rotor assembly, and cost of maintenance is high.

Disclosure of Invention

In order to solve the technical problem, the utility model provides an axial dimension is short, simple structure, disc impeller rotor subassembly and pump that cost of maintenance is low.

The technical scheme adopted by the utility model is as follows:

detachable disk impeller rotor subassembly, including impeller and the disk motor permanent magnet rotor who is fixed in the impeller, the impeller includes annular back plate, be fixed in the blade of terminal surface before this back plate and the wheel hub of backward axial extension, wheel hub's center is equipped with the shaft hole that supplies the pivot to pass through, be equipped with the spacing portion that prevents permanent magnet rotor pivoted on the backward face of back plate, be equipped with the axial hole in this spacing portion, the back plate has the coaxial positioning of mutual adaptation with permanent magnet rotor and pairs the structure group, and both detachably assemble together.

The utility model discloses a disk impeller rotor subassembly, disk motor permanent magnet rotor assemble in the impeller back plate for detachably, and this design shortens impeller rotor subassembly's axial dimensions, and simple structure, easy maintenance. When the impeller or the permanent magnet rotor is damaged, only the damaged part is disassembled and replaced, and the maintenance cost is favorably reduced.

Further, coaxial positioning is mated structure group and is included the protruding spacing portion of terminal surface axial behind the back plate and set up on permanent magnet rotor with the connecting portion of spacing portion adaptation, be equipped with the axial hole in this spacing portion, be equipped with the screw on the axial hole.

Furthermore, the limiting part comprises a circular convex rib and a lug connected with the periphery of the convex rib, the connecting part is a cylindrical surface matched with the outer cylindrical surface of the circular convex rib, the connecting part comprises a radial notch which is radially concave on the cylindrical surface, and the axial hole is arranged on the lug.

Furthermore, the annular convex rib is provided with an axial sunken part, and the sunken part is flush with the lug and the connecting part in the axial height in the mounting state.

Furthermore, the permanent magnet rotor is in a shape of an integral circular column.

Furthermore, the permanent magnet rotor comprises a rotor magnetic yoke in a circular column shape and a plurality of permanent magnets fixed on the magnetic yoke in the backward direction of the rear disc, and the connecting part is arranged on the inner cylindrical surface of the rotor magnetic yoke.

The disc type permanent magnet rotor can be fixed on the rotor yoke by the high-performance permanent magnet so as to improve the magnetic performance of the disc type permanent magnet rotor, the use amount of the high-performance permanent magnet can be reduced by adopting the rotor yoke as a magnetizer, and high magnetic cost ratio is obtained.

Furthermore, the permanent magnet is in a fan-ring shape, the rotor magnetic yoke is made of SMC soft magnetic composite materials, the end face of the rotor magnetic yoke is provided with a mounting groove matched with the permanent magnet, and the permanent magnet is fixed in the mounting groove by using an adhesive.

Further, the hub is a tubular structure made of wear-resistant material and is injection molded together with the impeller as an insert.

Furthermore, the outer cylindrical surface of the hub is provided with a groove for injection molding and fixing of the hub and the impeller, and when the hub is used as an insert and injection molding and fixing of the hub and the impeller, the groove is filled with plastic to form a hub fixing column for preventing the hub from loosening in the axial direction and the radial direction.

The utility model discloses still include a pump that should this disc impeller rotor subassembly:

the utility model provides an use centrifugal pump of disc impeller rotor subassembly, which comprises a pump body, assemble on the pump body and have into, the pump cover of delivery port, fix the disc motor stator subassembly on the pump body, still include above-mentioned arbitrary impeller rotor subassembly, the pump body is equipped with separates impeller rotor subassembly and disc motor stator subassembly in the isolation terminal surface of its both sides, stator module includes stator core, skeleton and enameled wire, stator core includes annular yoke portion and follows the bellied tooth portion of this yoke portion axial, the skeleton overlaps in stator core's tooth portion, the enameled wire twines in the skeleton, impeller rotor subassembly is located the impeller intracavity that pump body and pump cover surround.

Further, the yoke portion and the tooth portion of the stator core are molded into an integral structure using an SMC soft magnetic composite material.

Furthermore, the stator core is formed by splicing an annular yoke and a plurality of tooth parts, the tooth parts are made of SMC soft magnetic composite materials, and the yoke is made of soft magnetic materials.

Furthermore, a wear-resistant gasket is arranged between the pump body and the hub.

Furthermore, a gasket for preventing the impeller from axially moving is arranged between the pump cover and the hub.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic perspective view of a disc impeller rotor assembly;

FIG. 2 is a perspective view of the impeller;

FIG. 2-1 is a schematic perspective view of another embodiment of an impeller;

FIG. 3 is a cross-sectional schematic view of a first embodiment of a disc impeller rotor assembly;

FIG. 4 is a cross-sectional schematic view of a second embodiment of a disc impeller rotor assembly;

FIG. 5 is a cross-sectional schematic view of a third embodiment of a disc impeller rotor assembly;

FIG. 6 is a schematic structural diagram of a first embodiment of a permanent magnet rotor of a disc motor;

FIG. 6A is an enlarged partial schematic view of A in FIG. 6;

FIG. 7 is a schematic structural diagram of a second embodiment of a permanent magnet rotor of a disc motor;

FIG. 8 is a perspective view of a rotor yoke;

FIG. 8B is a schematic view of a portion of B in FIG. 8;

FIG. 9 is a perspective view of a permanent magnet;

FIG. 10 is a cross-sectional schematic view of a fourth embodiment of a disc impeller rotor assembly;

FIG. 11 is a perspective view of the hub;

FIG. 12 is an exploded view of the micro centrifugal pump;

FIG. 13 is a schematic sectional view of a micro centrifugal pump using the rotor assembly;

fig. 14 is a schematic perspective view of a disc stator;

fig. 15 is a schematic structural view of a first embodiment of a stator core;

fig. 16 is an exploded view of a second embodiment of a stator core;

FIG. 16-1 is a schematic structural view of an arrangement of split stator core teeth on a mold core of a mold;

fig. 16-2 is a schematic structural view of an integrated stator core arranged on a core of a mold;

fig. 17 is a schematic perspective view of the pump body of the present invention;

fig. 18 is a schematic perspective view of the pump cover of the present invention;

wherein: 1-pump body, 1.1-impeller cavity, 1.2-rotating shaft mounting hole, 1.3-spacer hole, 1.4-stator cavity, 1.5-isolation end face, 2-pump cover, 2.1-mounting table, 2.1.1-mounting hole, 2.1.1-lug, 3-impeller, 3.1-back plate, 3.1.1-hub, 3.1.11-shaft hole, 3.1.1 ' -hub, 3.1.11 ' -shaft hole, 3.1.12 ' -groove, 3.2-blade, 3.3-limiting part, 3.31-circular ring convex rib, 3.31.1-sunken part, 3.32-lug, 3.4-axial hole, 4-disc stator component, 4.1-stator core, 4.1.1-yoke part, 4.1.11-mounting hole, 4.1.2-enameled wire, 4.1.21-boss, 4.1.22-iron core upper end face, 4.2-tooth part, 4.3-skeleton, 5-rotating shaft, 5-yoke part, and the like, 6-rotor yoke, 6.1-connecting part, 6.11-radial gap, 6.2-mounting groove, 7-permanent magnet, 8-wear-resistant gasket, 8.1-bulge, 8.2-gasket hole, 9-gasket, 9.1-bulge, 9.2-gasket hole, 10-sealing ring, 11-disc type motor permanent magnet rotor, 11.1-connecting part, 11.11-radial gap, 11' -disc type motor permanent magnet rotor, 12-screw

Detailed Description

The invention will be further described with reference to the following drawings and specific embodiments:

as shown in fig. 1 and 2, the disc-type impeller rotor assembly includes an impeller 3 and a disc-type motor permanent magnet rotor 11 (referred to as a permanent magnet rotor for short) fixed on the impeller. The impeller 3 comprises an annular back disk 3.1, blades 3.2 fixed on the front end face of the back disk and a hub 3.1.1 extending axially backwards, and a shaft hole 3.1.11 for the rotating shaft to pass through is arranged in the center of the hub. The back disc 3.1 and the permanent magnet rotor 11 have mutually adapted sets of coaxially positioned mating formations, and the two are detachably assembled together. The axial dimension of the impeller rotor assembly is shortened by the design, and the impeller rotor assembly is simple in structure and convenient to maintain. When the impeller or the permanent magnet rotor is damaged, only the damaged part is disassembled and replaced, and the maintenance cost is favorably reduced.

Referring to fig. 2, 3, 6 and 6A, an embodiment of the coaxial positioning paired structure set includes a limiting portion 3.3 protruding axially on the backward end surface of the rear disc 3.1 and a connecting portion 11.1 disposed on the permanent magnet rotor 11 and adapted to the limiting portion 3.3, an axial hole 3.4 is disposed on the limiting portion, and a screw 12 is disposed on the axial hole 3.4. The back plate thickness of this design is thin, and the threaded connection length of the multiplicable screw of design of above-mentioned spacing portion promotes the stability that permanent magnet rotor and impeller back plate are connected.

As another embodiment, the rear disc 3.1 is provided with a protruding buckle protruding in the axial direction on the backward end surface, the permanent magnet rotor 11 is provided with a hole connected with the protruding buckle, and the rear disc and the permanent magnet rotor are detachably connected by using the protruding buckle and the hole.

In one embodiment of the stop portion, see fig. 2, the axially protruding stop portion includes a circular rib 3.31 and a lug 3.32 connected to the outer periphery of the rib, and an axial hole 3.4 is provided in the lug 3.32. This design designs the protruding muscle of ring of taking the lug with the axial bulge design of spacing portion, and it can strengthen the intensity of spacing portion. As another embodiment of the axially protruding limiting part, see fig. 2-1, the limiting part 3.3 may also be a cylinder 3.3 with a hole protruding on the rear disc surface, while the connecting part is a hole provided on the permanent magnet.

Referring to fig. 2 and 3, in a first embodiment of the disc type impeller rotor assembly, a hub 3.1.1 is a columnar structure formed by injection molding plastic in an injection molding process of an impeller rear disc 3.1, and a permanent magnet rotor 11 is provided with a connecting part 11.1 matched with a limiting part 3.3. The utility model provides an adaptation is the projection of the profile of the connecting portion of permanent magnet rotor and the profile of spacing portion on the face of perpendicular to pivot for hugging closely or being close the relation of hugging closely. The axial hole 3.4 of the limiting part is internally provided with a screw 12, the end part of the screw 12 is respectively contacted with the lug and the axial end face of the connecting part directly or indirectly (engineering common connecting pieces such as a gasket are arranged on the screw), and the permanent magnet rotor 11 is fixedly assembled on the impeller 3.

As shown in fig. 2 and 3, the annular rib 3.31 is provided with an axial depression 3.31.1, and the lug 3.32, the connecting portion 11.1 and the depression 3.31.1 are axially level in the mounted state. The screw can be hidden in the sinking part by the design, so that the collision of the screw with hanging wires or other sundries during working is reduced, and the service life of the assembly is prolonged.

Fig. 4 shows a second embodiment of the disc-type impeller rotor assembly, which is different from the first embodiment in that the hub 3.1.1' is a tubular structure made of wear-resistant material. As a preferred embodiment of the hub 3.1.1 ', the hub 3.1.1' is made of graphite material. When the impeller rear disc 3.1 is manufactured, the hub 3.1.1' is taken as an insert to be placed in a mold, and the insert is fixed on the rear disc 3.1 in an injection molding mode. Referring to fig. 4 and 11, the outer cylindrical surface of the hub 3.1.1 'is provided with a groove 3.1.12', and during the injection molding of the rear disc, the groove 3.1.12 'is filled with plastic and forms a hub fixing post 3.4 for preventing the hub 3.1.1' from loosening axially and radially. As a preferred embodiment of the hub groove, the groove 3.1.12 'may be provided as a cross-shaped groove on the outer cylindrical surface of the hub 3.1.1'. The disc type impeller rotor assembly has the advantages that the radial and axial abrasion resistance of the impeller rotor assembly is improved, and the service life of the impeller rotor assembly is prolonged.

Fig. 5 shows a third embodiment of a disc-type impeller rotor assembly, which is different from the first embodiment in that the present embodiment further includes a rotating shaft 5. In the injection molding of the rear disc in the embodiment, the rotating shaft 5 is used as an insert to be placed in a mold, and the rotating shaft and the mold are fixed on the rear disc 3.1 in an injection molding mode.

In a first embodiment of the permanent magnet rotor for a disc motor shown in fig. 6 and 6A, the permanent magnet rotor 11 for a disc motor has an overall circular cylindrical shape. The connecting portion 11.1 is a cylindrical surface adapted to the outer cylindrical surface of the annular rib 3.31 and includes a radial notch 11.11 radially recessed in the cylindrical surface. The cylindrical surface of connecting portion and the protruding muscle of the ring of impeller upper band lug only need be used to this scheme the adaptation installation can, the reducible connecting portion of this design is to disc motor permanent magnet rotor's magnetic loss.

In a second embodiment of the permanent magnet rotor for a disk motor shown in fig. 7 and 8, a permanent magnet rotor 11' for a disk motor includes a rotor yoke 6 having a circular column shape and a plurality of permanent magnets 7 fixed to the rotor yoke, and the permanent magnets 7 are fixed in a backward direction of a rear disk. The disk type permanent magnet rotor 11' is formed by splicing a rotor magnetic yoke 6 and a permanent magnet 7, the permanent magnet 7 can be made of materials with high magnetic performance, such as aluminum, iron and boron, and the rotor magnetic yoke 6 is made of common magnetic conductive materials. The design can improve the magnetism of the rotor assembly while controlling the cost so as to obtain a large magnetic valence ratio (the ratio of magnetic performance to material price). As shown in fig. 8, 8B and 10, the rotor yoke 6 includes a connection portion 6.1 adapted to the position-limiting portion 3.3 and a mounting groove 6.2 provided on the annular surface for mounting the permanent magnet 7, and the permanent magnet 7 is fixed in the mounting groove 6.2 by an adhesive. The connecting part 6.1 is a cylindrical surface arranged on the rotor yoke 6, and has the same structure as the connecting part 11.1 described in the first embodiment of the disc motor permanent magnet rotor. The permanent magnet 7 of this embodiment utilizes the mounting groove 6.2 of rotor yoke to carry out quick location installation, plays the effect that promotes production efficiency. Referring to fig. 8 and 9, in the preferred embodiment of the permanent magnet, the permanent magnet 7 is in a fan-shaped ring shape, and the mounting groove 6.2 is a fan-shaped ring-shaped groove with the same outer contour as that of the permanent magnet 7, so that the design can increase the area ratio of the permanent magnet on the rotor yoke, and has a positive effect on improving the magnetic performance of the disc type permanent magnet rotor.

As a preferred embodiment of the rotor yoke, the rotor yoke 6 is made of SMC soft magnetic composite material. SMC soft magnetic composites are composites having a soft magnetic function, which are composed of soft magnetic ferrite and a high polymer matrix, and can be produced into various complicated shapes by compression molding using powder particles of the soft magnetic ferrite as a main raw material with a mold. SMC material preparation for the rotor yoke in this design is favorable to the preparation of rotor yoke mounting groove 6.2, does benefit to production. Furthermore, the magnetic conductivity of the rotor magnetic yoke made of SMC is strong, which is beneficial to improving the magnetic performance of the disc rotor assembly.

The utility model provides a should disc impeller rotor subassembly's pump, it is shown in figure 12 and 13, this pump includes the pump body 1, cooperate in the pump body 1 on and be equipped with into, the pump cover 2 of delivery port, be located the disc impeller rotor subassembly in the impeller cavity 1.1 that the cooperation of the pump body 1 and pump cover 2 formed, fix disc stator subassembly 4 (for short stator module for short) on the pump body 1, establish the sealing washer 10 and the pivot 5 of setting in impeller cavity 1.1 between the pump body 1 and pump cover 2. The pump body 1 comprises an isolated end face 1.5 and a stator housing cavity 1.4 for housing a disc stator assembly 4. The disc type impeller rotor assembly and the disc type stator assembly 4 are separated from two sides of the disc type impeller rotor assembly and the disc type stator assembly by the isolation end face 1.5, and the waterproof isolation effect is achieved. The disc stator assembly 4 may be secured within the stator receiving cavity 1.4 by interference or screws. In another embodiment, the pump body 1 may be formed as an integral structure by injection molding using the disc stator assembly 4 as an insert.

As shown in fig. 12 and 14, the disc-type stator assembly 4 includes a stator core 4.1, a bobbin 4.2, and an enamel wire 4.3. The stator core 4.1 comprises an annular yoke part 4.1.1 and a tooth part 4.1.2 axially protruding from the yoke part, a framework 4.2 is fixed on the tooth part 4.1.2 of the stator core, and an enameled wire 4.3 is wound on the framework 4.2. When the disc type stator assembly is electrified, the stator assembly generates an axial magnetic field to drive the disc type impeller rotor assembly in the impeller cavity to rotate. The pump with the design can shorten the axial size of the pump, and has simple structure and convenient installation.

Referring to fig. 4 and 13, the rotating shaft 5 is fixed in the impeller cavity 1.1 in a non-rotatable manner, the rotating shaft 5 and the pump body 1 or the pump cover 2 are integrally fixed on any part in a plastic sealing manner, or the rotating shaft 5 is provided with a flat position which is fixedly arranged on an assembly hole of the pump body 1 or the pump cover 2. The shaft hole 3.1.11' on the disc impeller rotor component passes through the rotating shaft 5, and the disc impeller rotor component is rotatably assembled in the impeller cavity 1.1. The pump of the design has short axial dimension and is suitable for the appliance with small axial dimension. Furthermore, the disc type impeller rotor assembly in the pump rotor cavity is rotatably assembled on the rotating shaft, and compared with a pump with the disc type impeller rotor assembly with the impeller and the rotating shaft fixed integrally, the disc type impeller rotor assembly can rotate without adding bearings on the pump body and the pump cover, and the structure of the pump is simplified.

In another embodiment, the rotating shaft is rotatably fixed in the impeller cavity, the rotating shaft is integrally formed with the disc-type impeller rotor assembly, the bearing is arranged in the impeller cavity, and the rotating shaft of the disc-type impeller rotor assembly passes through the bearing to rotatably assemble the assembly in the impeller cavity.

As shown in fig. 15, a schematic structural diagram of a first embodiment of the stator core is shown, in which a stator core 4.1 includes an annular yoke 4.1.1 and teeth 4.1.2 projecting from the yoke in the axial direction, and is integrally molded by using a die for SMC soft magnetic composite material. Because of the utility model discloses a stator core 4 has higher bellied tooth portion of axial 4.1.2, adopts the traditional stamping process of stator core to be difficult to once make this structure of an organic whole, and the SMC material is likepowder, and its accessible mould is one-time press forming. The manufacturing method has the advantages that the manufacturing process is simple, the stator core can be integrally manufactured into a required shape at one time, and the production, processing and manufacturing are convenient.

Fig. 16 shows a schematic structural diagram of a stator core according to a second embodiment, in which a stator core 4.1 is formed by splicing an annular yoke 4.1.1 and columnar teeth 4.1.2. In order to improve the production efficiency, the annular yoke part 4.1.1 is made of soft magnetic materials by stamping, such as silicon steel sheets, silicon steel sheets and the like, and the tooth part 4.1.2 is made of SMC soft magnetic composite materials by stamping through a die. See fig. 16-1 and show, when manufacturing, stator core's tooth portion 4.1.2 can closely arrange in the mold core of mould, compare with the arrangement mode of stator core's manufacturing in the first scheme (see fig. 16-2 and show, yoke portion and tooth portion adopt integrated into one piece technology), the mold core of equal area, the utility model discloses stator core's tooth portion is big to the area proportion of mould mold core, and is high to the utilization ratio of embossing mold utensil. Furthermore, the tooth part and the yoke part of the stator core are manufactured by two different manufacturing processes, and the annular yoke part 4.1.1 is formed by directly punching and molding a soft magnetic material. In subsequent heat treatment, the core teeth 4.1.2 of the spliced stator core of the embodiment are arranged only according to the mode shown by 16-1, and compared with the heat treatment arrangement of 16-2 (integrated stator core), the embodiment can more effectively utilize the space of a heat treatment furnace, and has a positive effect on improving the utilization of heat in production equipment.

Between the pump body 1 and the hub 3.1.1, see fig. 12, 13 and 17, a wear resistant shim 8 is provided. The utility model discloses wearability gasket 8 is ceramic gasket, and it is including radial bellied bellying 8.1 and the gasket hole 8.2 that supplies the pivot to pass. As a preferred embodiment of the pump body, the pump body 1 is provided with a gasket hole 1.3 for attaching the gasket on an inner wall surface facing the back plate 3.1. A rotating shaft mounting hole 1.2 is formed in the gasket hole 1.3, and the rotating shaft 5 is inserted into the rotating shaft mounting hole 1.2. The hub is supported on the ceramic gasket by the design, so that the abrasion of the impeller to the inner wall surface of the pump body during rotation is reduced, and the effect of prolonging the service life of the pump is achieved.

Referring to fig. 12, 13 and 18, an installation table 2.1 is provided on the inner wall surface of the pump cover 2, an installation hole 2.1.1 is provided in the installation table 2.1, and the rotating shaft 5 is inserted into the installation hole 2.1.1. According to the design, the pump body rotating shaft mounting hole 1.2 and the pump cover mounting hole 2.1.1 are utilized to carry out bilateral positioning on the rotating shaft 5, and the swing of the disc type impeller rotor assembly during rotation is reduced. Further, the pump cover 2 is provided with a convex claw 2.1.1 on the mounting platform 2.1, and a gasket 9 for preventing the disc type impeller rotor assembly from axially shifting is fixedly assembled on the convex claw 2.1.1. As a preferred embodiment of the spacer, the spacer 9 is a ceramic spacer comprising a radially protruding boss 9.1 and a spacer hole 9.2 for the spindle to pass through. The axial float of reducible impeller of this design promotes the performance of pump.

The present invention is not limited to the above embodiment, and if various modifications or variations of the present invention do not depart from the spirit and scope of the present invention, they are intended to be covered if they fall within the scope of the claims and the equivalent technology of the present invention.

Claims (14)

1. Detachable disk impeller rotor subassembly, including impeller (3) and the disk motor permanent magnet rotor (11) who is fixed in the impeller, impeller (3) are including annular back dish (3.1), be fixed in this back dish preceding terminal surface blade (3.2) and backward axial extension wheel hub (3.1.1 or 3.1.1 '), wheel hub (3.1.1 or 3.1.1')'s center is equipped with shaft hole (3.1.11 or 3.1.11') that supply pivot (5) to pass through, its characterized in that: the rear disc (3.1) and the permanent magnet rotor (11 or 11') have mutually adapted sets of coaxially positioned mating structures, and the two are detachably assembled together.

2. The impeller rotor assembly of claim 1 wherein: the coaxial positioning matching structure group comprises a limiting part (3.3) which is axially raised on the backward end surface of the rear disc (3.1) and a connecting part (6.1 or 11.1) which is arranged on the permanent magnet rotor (11 or 11') and matched with the limiting part (3.3), an axial hole (3.4) is formed in the limiting part, and a screw (12) is arranged on the axial hole (3.4).

3. The impeller rotor assembly of claim 2 wherein: the limiting part (3.3) comprises a circular convex rib (3.31) and a lug (3.32) connected with the periphery of the convex rib, the connecting part (6.1 or 11.1) is a cylindrical surface matched with the outer cylindrical surface of the circular convex rib (3.31) and comprises a radial notch (6.11 or 11.11) which is concave along the radial direction on the cylindrical surface, and the axial hole (3.4) is arranged on the lug (3.32).

4. The impeller rotor assembly of claim 3 wherein: the annular convex rib (3.31) is provided with an axial sunken part (3.31.1), and the sunken part (3.31.1) is flush with the lug (3.32) and the connecting part (6.1 or 11.1) in the axial height under the installation state.

5. The impeller rotor assembly of claim 1 wherein: the permanent magnet rotor (11) is in a shape of an integral circular column.

6. The impeller rotor assembly of claim 2 wherein: the permanent magnet rotor (11') comprises a cylindrical rotor magnetic yoke (6) and a plurality of permanent magnets (7) which are fixed on the magnetic yoke in the backward direction of the rear disc (3.1), and the connecting part (6.1) is arranged on the cylindrical surface of the rotor magnetic yoke (6).

7. The impeller rotor assembly of claim 6 wherein: the permanent magnet (7) is in a fan-ring shape, the rotor magnetic yoke (6) is made of SMC soft magnetic composite materials, an installation groove (6.2) matched with the permanent magnet is formed in the end face, deviating from the rear disc (3.1), of the rotor magnetic yoke (6), and the permanent magnet (7) is fixed in the installation groove (6.2) through an adhesive.

8. The impeller rotor assembly of claim 1 wherein: the hub (3.1.1') is of tubular construction made of a wear-resistant material and is injection-molded together with the impeller as an insert.

9. The impeller rotor assembly of claim 8 wherein: the outer cylindrical surface of the hub (3.1.1 ') is provided with a groove (3.1.12 ') for injection molding and fixing of the hub and the impeller (3), and when the hub (3.1.1 ') is used as an insert and is injection molded with the impeller (3), the groove (3.1.12 ') is filled with plastic to form a hub fixing column (3.4) for preventing the hub (3.1.1 ') from loosening axially and radially.

10. The utility model provides an use miniature centrifugal pump of disk impeller rotor subassembly, includes the pump body (1), assembles pump cover (2) that just has into, the delivery port on the pump body (1), fixes disk motor stator subassembly (4) on the pump body (1), its characterized in that: the impeller rotor assembly of any one of claims 1 to 9, wherein the pump body (1) is provided with an isolation end face (1.5) which separates the impeller rotor assembly and the disc motor stator assembly (4) at two sides of the impeller rotor assembly and the disc motor stator assembly, the stator assembly (4) comprises a stator core (4.1), a framework (4.2) and an enameled wire (4.3), the stator core (4.1) comprises an annular yoke portion (4.1.1) and a tooth portion (4.1.2) axially protruding from the yoke portion, the framework (4.2) is sleeved on the tooth portion (4.1.2) of the stator core, the enameled wire (4.3) is wound on the framework (4.2), and the impeller rotor assembly is located in an impeller cavity (1.1) surrounded by the pump body and the pump cover.

11. A micro centrifugal pump using a disc impeller rotor assembly according to claim 10, wherein: the yoke part (4.1.1) and the tooth part (4.1.2) of the stator core (4.1) are molded into an integral structure by adopting SMC soft magnetic composite materials.

12. The micro centrifugal pump using the disc impeller rotor assembly according to claim 10, wherein the stator core (4.1) is formed by splicing an annular yoke (4.1.1) and a plurality of teeth (4.1.2), the material of the teeth is SMC soft magnetic composite material, and the material of the yoke is soft magnetic material.

13. A micro-centrifugal pump using a disc-type impeller rotor assembly according to claim 12, wherein a wear-resistant gasket (8) is provided between the pump body (1) and the hub (3.1.1 or 3.1.1').

14. A micro centrifugal pump using a disc impeller rotor assembly according to claim 10 or 13, wherein: and a gasket (9) for preventing the axial movement of the impeller is arranged between the pump cover (2) and the hub (3.1.1 or 3.1.1').

Images