CN215566651U

CN215566651U - Centrifugal pump driven by surface-mounted self-starting permanent magnet synchronous motor

Info

Publication number: CN215566651U
Application number: CN202120228737.4U
Authority: CN
Inventors: 黄诚; 周磊
Original assignee: Huanyi Electromagnetic Technology Yichang Co ltd
Current assignee: Huanyi Electromagnetic Technology Yichang Co ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2022-01-18
Anticipated expiration: 2031-01-27

Abstract

The utility model discloses a centrifugal pump driven by a surface-mounted self-starting permanent magnet synchronous motor, which comprises a pump body, an impeller, an inner cover, an outer cover, a casing and a rotor shaft, wherein a rotor assembly is sleeved on the rotor shaft; the rotor assembly comprises a rotor sleeved on the rotor shaft, and a plurality of permanent magnet magnetic shoes are attached to the outer circumference of the rotor; the stator assembly is matched with the rotor assembly and comprises a stator core arranged in the shell and a stator winding wound on the stator core; the rotor shaft is connected with the impeller; the centrifugal pump has the advantages of simple and compact structure, easy assembly and maintenance, lower cost, no intermediate conversion link, direct action of the rotor on the rotor shaft to drive the impeller to rotate, high rotating thrust, high motor efficiency, low energy consumption and easy control of the rotating speed, and can be used in various working conditions with self-starting and compact structure.

Description

Centrifugal pump driven by surface-mounted self-starting permanent magnet synchronous motor

Technical Field

The utility model relates to the technical field of centrifugal pumps, in particular to a centrifugal pump driven by a surface-mounted self-starting permanent magnet synchronous motor.

Background

Centrifugal pumps operate by causing water to move centrifugally as a result of the rotation of an impeller. Before the water pump is started, the pump shell and the water suction pipe are filled with water, then the motor is started, the pump shaft drives the impeller and the water to rotate at a high speed, the water is thrown to the outer edge of the impeller to be thrown into a water pressure pipeline of the water pump through a flow channel of the volute-shaped pump shell.

The centrifugal pump is usually provided with a motor driving structure, and the traditional motor structure is complex in structure, such as materials, a transmission system and the like; the centrifugal pump and the permanent magnet synchronous motor are matched in 2018, an impeller is arranged in a pump cavity of a pump shell of the centrifugal pump, a pump body shaft fixedly penetrating through the center of the impeller extends out of the pump shell, a water inlet and a water outlet are formed in the pump shell, an oscilloscope and a pressure sensor are sequentially connected to the water outlet in series, and a signal output end of the pressure sensor is connected with a servo driver through a wire; a stator and a rotor are arranged in a motor shell of the permanent magnet synchronous motor, a motor shaft fixedly penetrating through the center of the rotor extends out of the motor shell, a temperature detector and a rotating speed sensor are arranged on the motor shell, and a signal output end of the temperature detector and a signal output end of the rotating speed sensor are connected with a servo driver through electric wires; a torque sensor is arranged between the driving end of the motor shaft and the driving end of the pump body shaft, the signal output end of the torque sensor is connected with a servo driver through an electric wire, and the servo driver is electrically connected with a permanent magnet synchronous motor through a frequency converter. The connection between the centrifugal pump and the permanent magnet synchronous motor is complex, so that the overall driving structure of the centrifugal pump is huge, and the space is occupied greatly in the using process.

Disclosure of Invention

The utility model aims to provide a centrifugal pump driven by a surface-mounted self-starting permanent magnet synchronous motor, aiming at the problems in the prior art.

In order to achieve the purpose, the utility model adopts the technical scheme that:

the centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor comprises a pump body, wherein an impeller is arranged in the pump body, an inner concave type inner cover is arranged above the pump body, an outer cover is arranged above the inner cover, a casing is arranged above the outer cover, a rotor shaft is arranged in the casing, and a rotor assembly is sleeved on the rotor shaft; the rotor assembly comprises a rotor sleeved on the rotor shaft, a plurality of permanent magnet magnetic shoes are pasted on the outer circumference of the rotor, the permanent magnet magnetic shoes are ferrite magnetic shoes and/or neodymium iron boron magnetic shoes, and at least one circle of magnetic shoe anchor ear is arranged outside each permanent magnet magnetic shoe; the stator assembly is matched with the rotor assembly and comprises a stator core arranged in the shell and a stator winding wound on the stator core, the stator core is of an integrally formed or combined annular structure, and the permanent magnet magnetic shoe is arranged opposite to the stator winding; one end of the rotor shaft, which is far away from the rotor assembly, sequentially penetrates through the outer cover and the inner cover and extends into the pump body to be connected with the impeller.

The centrifugal pump has the advantages of simple and compact structure, easy assembly and maintenance, lower cost, reduction of the arrangement of a reduction gear, a complex transmission system and a lubricating system in various working conditions requiring self-starting and compact structure, no intermediate conversion link, direct action of the rotor on the rotor shaft to drive the impeller to rotate, large rotating thrust, high motor efficiency, low energy consumption and easy control of the rotating speed. When the permanent magnet synchronous motor is electrified, the permanent magnet magnetic shoe provides a radial rotating magnetic field for the stator core, so that the stator component provides axial rotating torque for the rotor, and the rotor shaft and the impeller are directly driven to work.

The permanent magnet magnetic shoe can be fixed on the rotor by adopting a surface-mounted mode and matching with the structure of the permanent magnet magnetic shoe, so that the use of small fasteners such as screws is reduced, drilling, slotting and the like on the permanent magnet magnetic shoe are also avoided, the complete structure of the magnetic shoe is maintained, and the magnetic field is favorably formed and the magnetic drive effect is improved.

The permanent magnet magnetic shoe adopts split type arc plate structure, the loading and unloading and independent adjustment of being convenient for, the setting of magnetic shoe staple bolt can further improve the fastening degree and the installation stability of permanent magnet magnetic shoe, its displacement change is also less in long-term work, also can keep better with the clearance between stator module.

The mode that adopts inner cup and enclosing cover to combine can simplify part setting and axial dimension between the casing and the pump body, the enclosing cover can play the effect of holding and opening.

Furthermore, an outer check ring and an inner check ring are arranged on the lower end face of the outer cover, the peripheral wall of the inner cover is clamped between the outer check ring and the inner circumference of the upper opening of the pump body, and the inner check ring is arranged close to the rotor shaft and extends to the end face of the inner cover along the axial direction; the periphery of the outer cover is fixedly connected with the pump body and the casing in a threaded manner.

By adopting the outer cover and the inner cover with the structure, the outer baffle ring can be clamped and fixed with the inner cover, the outer cover serves as an end cover of the pump body and can also be directly used for connecting the casing, and the outer cover, the outer cover and the inner cover are fastened together through a plurality of bolts, so that the integrity and the stability are better; a plurality of cavities can be formed between the inner retainer ring and the inner cover, and the inner retainer ring can be used as an oil chamber.

Furthermore, a water retaining ring is arranged at a position, between the inner cover and the outer cover, of the rotor shaft, and multiple mechanical seals are arranged on one sides, close to the inner cavity of the pump body, of the rotor shaft and the inner cover. Can ensure the sealing performance and reduce the liquid leakage.

Further, the casing is cylindrical, and the rotor shaft is connected with the upper end and the lower end of the casing through a plurality of bearings respectively.

Furthermore, the rotor shaft is a multi-stage stepped shaft, the lower end of the rotor shaft penetrates through the upper end face of the impeller and is fixedly connected with the upper end face of the impeller through a coupling part and a screw connecting part, the coupling part is arranged between the rotor shaft and the impeller, the screw connecting part is arranged at the end part of the rotor shaft, and the coupling part is provided with an inverted end face. The connection mode is convenient to assemble and disassemble and has stable power transmission performance.

Furthermore, a clamping groove is formed in the outer circumference of the rotor, the inner side of the permanent magnet magnetic shoe is clamped in the clamping groove, and a glue layer is arranged between the permanent magnet magnetic shoe and the clamping groove. The clamping groove can clamp the permanent magnet magnetic shoe, and can play a role of pre-fixing during adhesion, so that adhesion and fixation are facilitated; the axial and circumferential limiting function can be achieved at the later stage.

Further, the clamping groove is an arc-shaped groove; the glue layer is coated viscose, the viscose is industrial glue, such as high-temperature magnetic tile bonding glue, and the high-temperature magnetic tile bonding glue has good bonding strength at high temperature.

Furthermore, the permanent magnet magnetic shoes are at least two blocks which are arranged in central symmetry, the rotor and the rotor shaft are in an integrated structure, or the inner circumference of the rotor is connected with the outer circumference of the rotor shaft through a flat key.

Furthermore, the magnetic shoe hoop is circumferentially arranged at the middle position of the rotor assembly, the magnetic shoe hoop fastens a plurality of permanent magnet magnetic shoes and is fixedly connected with the rotor in a threaded manner, and the threaded position is arranged at the gap between the adjacent permanent magnet magnetic shoes. Such setting has utilized the rotor clearance space between adjacent magnetic shoe on the one hand, and on the other hand can further improve the fastening ability of magnetic shoe staple bolt avoids the displacement of magnetic shoe staple bolt.

Further, the annular structure comprises an annular columnar structure or an annular disc structure; the annular columnar structure is arranged corresponding to the outer circumference of the rotor, and the annular disc structure is arranged corresponding to the end face of the rotor.

Compared with the prior art, the utility model has the beneficial effects that: 1. the centrifugal pump has the advantages of simple and compact structure, easy assembly and maintenance, lower cost, no intermediate conversion link, direct action of the rotor on the rotor shaft to drive the impeller to rotate, high rotating thrust, high motor efficiency, low energy consumption and easy control of the rotating speed, and can be used in various working conditions requiring self-starting and compact structure; 2. the permanent magnet magnetic shoe can be fixed on the rotor by adopting a surface-mounted mode and matching with the structure of the permanent magnet magnetic shoe, so that the use of small fasteners such as screws is reduced, the drilling, slotting and the like on the permanent magnet magnetic shoe are avoided, the complete structure of the magnetic shoe is maintained, the formation of a magnetic field is facilitated, and the magnetic driving effect is improved; 3. the permanent magnet magnetic shoe adopts a split arc-shaped plate structure, so that the mounting and the dismounting and the independent adjustment are convenient, the arrangement of the magnetic shoe hoop can further improve the fastening degree and the mounting stability of the permanent magnet magnetic shoe, the displacement change is less in long-term work, and the gap between the permanent magnet magnetic shoe and the stator component can be kept better; 4. the mode that adopts inner cup and enclosing cover to combine can simplify part setting and axial dimension between the casing and the pump body, the enclosing cover can play the effect of holding and opening.

Drawings

FIG. 1 is an overall schematic view of a centrifugal pump driven by a surface-mounted self-starting permanent magnet synchronous motor according to the present invention;

FIG. 2 is a schematic structural view of a motor cross section of a centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor of the present invention;

FIG. 3 is a schematic structural diagram of a rotor assembly of a centrifugal pump driven by a surface-mounted self-starting permanent magnet synchronous motor according to the present invention;

FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic view of another stator core structure of a centrifugal pump driven by a surface-mounted self-starting PMSM according to the present invention;

in the figure: 1. a pump body; 2. an impeller; 3. an inner cover; 4. an outer cover; 401. an outer retainer ring; 402. an inner retainer ring; 5. a housing; 6. a rotor shaft; 7. a rotor assembly; 701. a rotor; 702. a permanent magnet magnetic shoe; 703. a magnetic shoe hoop; 704. a glue layer; 705. a fastener; 706. a clamping groove; 8. a stator assembly; 801. a stator core; 802. a stator winding; 9. a bearing; 10. mechanical sealing; 11. a water retaining ring; 12. a coupling member; 13. and (7) a threaded connector.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The first embodiment is as follows:

as shown in fig. 1 and 2, a centrifugal pump driven by a surface-mounted self-starting permanent magnet synchronous motor comprises a pump body 1, wherein an impeller 2 is arranged in the pump body 1, a concave inner cover 3 is arranged above the pump body 1, an outer cover 4 is arranged above the inner cover 3, a casing 5 is arranged above the outer cover 4, a rotor shaft 6 is arranged inside the casing 5, and a rotor assembly 7 is sleeved on the rotor shaft 6; the rotor assembly 7 comprises a rotor 701 sleeved on the rotor shaft 6, a plurality of permanent magnet magnetic shoes 702 are pasted on the outer circumference of the rotor 701, the permanent magnet magnetic shoes 702 are ferrite magnetic shoes and neodymium iron boron magnetic shoes which are alternately arranged, and at least one circle of magnetic shoe anchor ear 703 is arranged outside each permanent magnet magnetic shoe 702; the casing 5 is further provided with a stator assembly 8 matched with the rotor assembly 7, the stator assembly 8 comprises a stator core 801 arranged inside the casing 5 and a stator winding 802 wound on the stator core 801, the stator core 801 is of an integrally formed annular columnar structure, and the permanent magnet magnetic shoe 702 is arranged opposite to the stator winding 802; one end of the rotor shaft 6, which is far away from the rotor assembly 7, sequentially penetrates through the outer cover 4 and the inner cover 3 and extends into the pump body 1 to be connected with the impeller 2.

The centrifugal pump is simple and compact in structure, easy to assemble and maintain, low in cost, capable of being used in various working conditions needing self-starting and compact in structure, reducing the arrangement of a reduction gear, a complex transmission system and a lubricating system, free of intermediate conversion links, capable of directly acting on the rotor shaft 6 through the rotor 701 to drive the impeller 2 to rotate, high in rotating thrust, high in motor efficiency, low in energy consumption and easy to control the rotating speed. When the permanent magnet synchronous motor is powered on, the permanent magnet magnetic shoe 702 provides a radially rotating magnetic field for the stator core 801, so that the stator assembly 8 is prompted to provide a torque with a rotating axis for the rotor 701, and the rotor shaft 6 and the impeller 2 are directly driven to work.

By adopting a surface-mounted mode, the permanent magnet magnetic shoe 702 can be conveniently fixed on the rotor 701, the use of small fasteners such as screws is reduced, drilling, slotting and the like on the permanent magnet magnetic shoe 702 are also avoided, the complete structure of the magnetic shoe is kept, and the magnetic shoe is beneficial to the formation of a magnetic field and the improvement of the magnetic driving effect.

The permanent magnet magnetic shoe 702 adopts a split arc-shaped plate structure, is convenient to assemble, disassemble and independently adjust, and the arrangement of the magnetic shoe hoop 703 can further improve the fastening degree and the installation stability of the permanent magnet magnetic shoe 702, the displacement change of the permanent magnet magnetic shoe 702 is less in long-term work, and the gap between the permanent magnet magnetic shoe and the stator assembly can be kept better.

The mode that adopts inner cup 3 and enclosing cover 4 to combine can simplify the part setting and the axial dimension between casing 5 and the pump body 1, the enclosing cover can play the effect of holding from top to bottom.

Further, an outer retainer ring 401 and an inner retainer ring 402 are arranged on the lower end surface of the outer cover 4, the peripheral wall of the inner cover 3 is clamped between the outer retainer ring 401 and the inner circumference of the upper opening of the pump body 1, and the inner retainer ring 402 is arranged close to the rotor shaft 6 and extends towards the end surface of the inner cover 3 along the axial direction; the periphery of the outer cover 4 is fixedly connected with the pump body 1 and the machine shell 5 in a threaded manner.

By adopting the outer cover 4 and the inner cover 3 with the structure, the outer retainer ring 401 can be clamped and fixed with the inner cover 3, the outer cover 4 serves as an end cover of the pump body 1 and can also be directly used for connecting the shell 5, and the three are fastened together through a plurality of bolts, so that the integrity and the stability are better; a plurality of cavities can be formed between the inner retainer 402 and the inner cover 3, and can serve as oil chambers.

Further, a water retaining ring 11 is arranged at a position, between the inner cover 3 and the outer cover 4, of the rotor shaft 6, and multiple mechanical seals 10 are arranged at one sides, close to the inner cavity of the pump body 1, of the rotor shaft 6 and the inner cover 3. Can ensure the sealing performance and reduce the liquid leakage.

Further, the casing 5 is cylindrical, and the rotor shaft 6 is connected with the upper end and the lower end of the casing 5 through a plurality of bearings 9.

Further, the rotor shaft 6 is a multi-stage stepped shaft, the lower end of the rotor shaft 6 penetrates through the upper end face of the impeller 2 and is fixedly connected with the upper end face of the impeller 2 through a coupling member 12 and a screw member 13, the coupling member 12 is arranged between the rotor shaft 6 and the impeller 2, the screw member 13 is arranged at the end portion of the rotor shaft 6, and the coupling member 12 is provided with an inverted end face. The connection mode is convenient to assemble and disassemble and has stable power transmission performance.

Further, as shown in fig. 3 and 4, an engaging groove 706 is formed in an outer circumference of the rotor 701, and an adhesive layer 704 is disposed between the inner side of the permanent magnet shoe 702 and the engaging groove 706, and the inner side of the permanent magnet shoe 702 is engaged in the engaging groove 706. The clamping groove 706 can clamp the permanent magnet shoe 702, and can play a role of pre-fixing during bonding, so that the bonding and fixing are facilitated; the axial and circumferential limiting function can be achieved at the later stage.

Further, the engaging groove 706 is an arc-shaped groove; the glue layer 704 is a coated glue, and the glue is an industrial glue, such as a high-temperature magnetic tile adhesive, and has better adhesive strength at high temperature.

Further, the permanent magnet shoes 702 are two pieces arranged with central symmetry, and the rotor 701 is connected with the rotor shaft 6 by flat keys.

Further, the magnetic shoe hoop 703 is circumferentially arranged at the middle position of the rotor assembly 7, the magnetic shoe hoop 703 fastens the plurality of permanent magnet magnetic shoes 702 and is in threaded connection with the rotor 701, and the threaded connection position is arranged at a gap between the adjacent permanent magnet magnetic shoes 702. Such setting has utilized the rotor clearance space between adjacent magnetic shoe on the one hand, and on the other hand can further improve the fastening ability of magnetic shoe staple bolt avoids the displacement of magnetic shoe staple bolt.

Example two:

the present embodiment is different from the first embodiment in that a stator core of another structure is provided.

As shown in fig. 5, the annular pillar structure includes six fan-shaped pillar structures; the fan-shaped columnar structures are disposed corresponding to the outer circumference of the rotor 701 and are respectively installed in a screwed manner on the inner circumference of the casing 5.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor comprises a pump body, wherein an impeller is arranged in the pump body, and the centrifugal pump is characterized in that an inner concave type inner cover is arranged above the pump body, an outer cover is arranged above the inner cover, a casing is arranged above the outer cover, a rotor shaft is arranged inside the casing, and a rotor assembly is sleeved on the rotor shaft; the rotor assembly comprises a rotor sleeved on the rotor shaft, a plurality of permanent magnet magnetic shoes are pasted on the outer circumference of the rotor, the permanent magnet magnetic shoes are ferrite magnetic shoes and/or neodymium iron boron magnetic shoes, and at least one circle of magnetic shoe anchor ear is arranged outside each permanent magnet magnetic shoe; the stator assembly is matched with the rotor assembly and comprises a stator core arranged in the shell and a stator winding wound on the stator core, the stator core is of an integrally formed or combined annular structure, and the permanent magnet magnetic shoe is arranged opposite to the stator winding; one end of the rotor shaft, which is far away from the rotor assembly, sequentially penetrates through the outer cover and the inner cover and extends into the pump body to be connected with the impeller.

2. The centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor according to claim 1, wherein an outer retainer ring and an inner retainer ring are arranged on the lower end surface of the outer cover, the outer retainer ring is clamped with the peripheral wall of the inner cover between the outer retainer ring and the inner circumference of the upper opening of the pump body, and the inner retainer ring is arranged close to the rotor shaft and extends towards the end surface of the inner cover along the axial direction; the periphery of the outer cover is fixedly connected with the pump body and the casing in a threaded manner.

3. The centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor according to any one of claims 1 or 2, wherein a water retaining ring is arranged at a position between the inner cover and the outer cover of the rotor shaft, and multiple mechanical seals are arranged at one sides of the rotor shaft and the inner cover, which are close to the inner cavity of the pump body.

4. The centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor according to claim 1, wherein the casing is cylindrical, and the rotor shaft is connected with the upper end and the lower end of the casing through a plurality of bearings respectively.

5. The centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor according to claim 1, wherein the rotor shaft is a multi-stage stepped shaft, the lower end of the rotor shaft penetrates through the upper end face of the impeller and is fixedly connected through a coupling member and a screw connecting member, the coupling member is arranged between the rotor shaft and the impeller, the screw connecting member is arranged at the end part of the rotor shaft, and the coupling member has an inverted end face.

6. The centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor according to claim 1, wherein a clamping groove is formed in the outer circumference of the rotor, the inner side of the permanent magnet magnetic shoe is clamped in the clamping groove, and a glue layer is arranged between the permanent magnet magnetic shoe and the clamping groove.

7. The centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor according to claim 6, wherein the clamping groove is an arc-shaped groove; the glue layer is a coated adhesive which is an industrial adhesive, such as a high-temperature magnetic tile adhesive.

8. The centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor according to claim 1, wherein the permanent magnet magnetic shoes are at least two pieces arranged in central symmetry, the rotor and the rotor shaft are of an integrally-formed structure, or the inner circumference of the rotor and the outer circumference of the rotor shaft are in flat key connection.

9. The centrifugal pump driven by the surface-mounted self-starting permanent magnet synchronous motor according to claim 1, wherein the magnetic shoe hoop is circumferentially arranged at the middle position of the rotor assembly, the magnetic shoe hoop fastens a plurality of the permanent magnet magnetic shoes and is fixedly connected with the rotor in a threaded manner, and the threaded position is arranged at a gap between the adjacent permanent magnet magnetic shoes.