CN217311630U - Suspension centrifugal pump - Google Patents

Abstract

The utility model discloses a suspension centrifugal pump, which adopts the magnetic suspension technology and comprises a stator assembly and a pump body, wherein the stator assembly comprises a stator shell and a first magnetic suspension module arranged in the stator shell, and the stator shell is provided with a socket and an accommodating space communicated with the socket; the pump body comprises a pump shell, a rotor assembly and an impeller, wherein the pump shell is provided with an impeller chamber, a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are communicated with the impeller chamber; the impeller is fixed on the rotor assembly, the rotor assembly and the impeller are rotatably arranged in the impeller chamber, and the rotor assembly is provided with a second magnetic suspension module matched with the first magnetic suspension module; the pump shell is installed in the containing space in a pluggable mode, and when the pump shell is inserted into the containing space, the first magnetic suspension module and the second magnetic suspension module are matched so that the rotor assembly is suspended in the impeller chamber. The utility model discloses technical scheme can reduce the pump to fluidic influence, guarantees fluidic clean.

Description

Suspension centrifugal pump

Technical Field

The utility model relates to a pump technical field, in particular to floated centrifugal pump.

Background

The pump is a common device for conveying fluid, and is widely applied to the fields of industrial production, medical apparatus and the like, such as blood pumps, and generally comprises a motor and a pump body, and an impeller in the pump body is driven to rotate through the motor and a shaft transmission mode. The existing pump has the defects that the cleanness of fluid is difficult to ensure due to the existence of a transmission shaft and a bearing, for example, in a blood pump, the blood is damaged due to friction heating of the bearing part. In the industrial field, the lubricating oil of the bearings in the pump also contaminates the fluid to be transported.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a floated centrifugal pump aims at reducing the influence of pump to the fluid, guarantees fluidic clean.

In order to achieve the above object, the utility model provides a floated centrifugal pump, include:

the stator assembly comprises a stator shell and a first magnetic suspension module arranged in the stator shell, wherein the stator shell is provided with a socket and an accommodating space communicated with the socket;

the pump body comprises a pump shell, a rotor assembly and an impeller, wherein the pump shell is provided with an impeller chamber, a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are communicated with the impeller chamber; the impeller is fixed on the rotor assembly, the rotor assembly and the impeller are rotatably arranged in the impeller chamber, and the rotor assembly is provided with a second magnetic suspension module matched with the first magnetic suspension module;

the pump shell is installed in the containing space in a pluggable mode, and when the pump shell is inserted into the containing space, the first magnetic suspension module and the second magnetic suspension module are matched, so that the rotor assembly is suspended in the impeller chamber.

Optionally, the rotor assembly includes the rotor shell, the impeller has the water conservancy diversion surface, the water conservancy diversion surface is equipped with a plurality of blades, and is a plurality of the blade centers on the axis of rotation interval distribution of rotor assembly, fluid inlet orientation the water conservancy diversion surface sets up, the rotor shell with the impeller deviates from one side of water conservancy diversion surface encloses and closes and form the seal chamber, second magnetic suspension module is located in the seal chamber.

Optionally, the impeller includes the gyration plate body and a supporting cylinder, the gyration plate body is equipped with the water conservancy diversion surface, the supporting cylinder is located the gyration plate body deviates from one side on water conservancy diversion surface, the outer peripheral face of supporting cylinder with the periphery interval of gyration plate body, rotor housing locates the supporting cylinder periphery, and with the gyration plate body, the supporting cylinder encloses jointly and closes and forms the seal chamber.

Optionally, the rotating plate body is provided with a central hole, the central hole is communicated with the space inside the support cylinder, the fluid inlet faces the central hole, and the plurality of blades are distributed on the periphery of the central hole.

Optionally, the impeller further comprises a plurality of reinforcing ribs, and the plurality of reinforcing ribs are distributed on the periphery of the supporting cylinder and connected with the rotating plate body; and/or the blades, the rotating plate body and the supporting cylinder are integrally formed.

Optionally, the outer edge of the vane extends towards the outer periphery of the flow guiding surface.

Optionally, the outer edge of the vane is disposed flush with the outer periphery of the flow guide surface.

Optionally, the outer edge of the vane is located inside the outer periphery of the flow guide surface and spaced from the outer periphery of the flow guide surface.

Optionally, the pump housing comprises a first housing and a second housing, the first housing comprises a mounting shell portion and a connecting shell portion, the mounting shell portion is arranged with an opening at one end, the connecting shell portion is connected to the opening end of the mounting shell portion and extends towards the lateral direction of the connecting shell portion, and the connecting shell portion is provided with the fluid outlet; the second housing is provided with the fluid inlet and is connected to the peripheral part of the connecting shell part to form the impeller chamber by enclosing with the first housing, the rotor assembly is installed in the installation shell part, and the installation shell part is installed in the accommodating space in a pluggable manner.

Optionally, the second magnetic suspension module comprises a first permanent magnet ring, a first iron core ring, a second permanent magnet ring and a second iron core ring which are coaxially arranged, the first permanent magnet ring and the first iron core ring are located above the second iron core ring, and the second permanent magnet ring is arranged around the outer circumferential surface of the second iron core ring; the first magnetic suspension module comprises a stator permanent magnet ring, a stator iron core ring, a magnetic conductive disc, a displacement sensor and a plurality of coil windings, the stator permanent magnet ring, the stator iron core ring, the magnetic conductive disc, the displacement sensor and the coil windings are arranged in the stator shell, the coil windings comprise a stator iron core, a suspension coil and a driving coil, the stator iron core, the suspension coil and the driving coil extend vertically, the suspension coil and the driving coil are respectively sleeved on the stator iron core vertically, and the plurality of coil windings are uniformly distributed around the accommodating space circumferentially; the stator permanent magnet ring and the stator iron core ring are arranged above the stator iron core, the stator permanent magnet ring and the stator iron core ring are arranged around the accommodating space, the lower end of the stator iron core is abutted and fixed to the magnetic conduction disc, and the suspension coil and the driving coil are positioned on one side, facing the accommodating space, of the magnetic conduction disc; the displacement sensor is used for detecting the radial offset of the rotor assembly in the accommodating space, the suspension coil is connected with the displacement sensor, and the suspension coil, the stator iron core, the magnetic conductive disc, the second iron core ring and the second permanent magnet ring form a suspension magnetic circuit system so as to enable the rotor assembly to be suspended in the impeller chamber; the stator permanent magnet ring, the stator iron core ring, the first permanent magnet ring and the first iron core ring form a reinforced magnetic circuit system so as to enhance the axial suspension force of the rotor assembly; the driving coil, the stator core, the magnetic conductive disc, the second core ring and the second permanent magnet ring form a driving rotary magnetic circuit system, so that the rotor assembly rotates in the impeller chamber.

Optionally, the rotor assembly further includes a blocking ring, and the first permanent magnet ring, the first iron core ring, the blocking ring, and the second permanent magnet ring are sequentially arranged in an abutting manner from top to bottom along a vertical direction; and/or the stator assembly further comprises a fixed disc, and the upper end of the stator core is fixedly inserted into the fixed disc; the suspension coil and the drive coil are both located between the fixed disk and the magnetically permeable disk.

Optionally, the second magnetic suspension module comprises a first permanent magnet ring, a rotor iron core ring and a second permanent magnet ring which are coaxially arranged in sequence from top to bottom along the vertical direction;

first magnetic suspension module is including locating suspension module, the rotatory module of drive and the displacement sensor in the stator shell, the displacement sensor is used for detecting the radial skew of rotor assembly, wherein:

the suspension module includes: the stator comprises a plurality of first iron cores, a plurality of suspension coils, a first magnetic conduction disc and a stator permanent magnet ring, wherein the first iron cores are vertically arranged, the lower ends of the first iron cores are abutted and fixed to the first magnetic conduction disc, and the first iron cores are distributed at intervals along the circumferential direction of the first magnetic conduction disc and are positioned on the outer side of the accommodating space; each first iron core is correspondingly wound with one suspension coil, and the suspension coil is connected with the displacement sensor;

the driving rotation module comprises a plurality of second iron cores, a plurality of driving coils and second magnetic conduction disks, the second iron cores are vertically arranged, the lower ends of the second iron cores are abutted and fixed to the second magnetic conduction disks, the second iron cores are distributed at intervals along the circumferential direction of the second magnetic conduction disks, and each second iron core is correspondingly wound with one driving coil;

the stator permanent magnet ring is arranged corresponding to the first permanent magnet ring, and the first permanent magnet ring and the stator permanent magnet ring form a reinforced magnetic circuit system so as to enhance the axial suspension force of the rotor assembly; the rotor iron core ring, the second permanent magnet ring, the first iron core, the suspension coil and the first magnetic conductive disc form a suspension magnetic circuit system, so that the rotor assembly is suspended in the impeller chamber; the rotor iron core ring, the second permanent magnet ring, the second iron core, the driving coil and the second magnetic conductive disc form a driving rotary magnetic circuit system so as to drive the rotor assembly to rotate in the impeller chamber.

The utility model discloses technical scheme is through setting up the stator assembly and the pump body of components of a whole that can function independently with floated centrifugal pump for the stator casing of stator assembly is equipped with the accommodation space of socket and intercommunication socket, rotatably locates the rotor assembly in the pump casing of the pump body, and the impeller is fixed on the rotor assembly. When the pump shell is inserted into the accommodating space through the socket, the first magnetic suspension module of the stator assembly is matched with the second magnetic suspension module of the rotor assembly, so that the rotor assembly rotates in a suspended mode in the impeller chamber. Because parts such as a shaft, a bearing and the like do not exist in the impeller chamber in the pump body, the conditions that the fluid state is influenced (for example, blood coagulation is caused by heat generated by friction) and fluid is polluted by heat, abrasion and the like generated by friction of the shaft and the bearing can be avoided, the influence of the pump on the fluid is greatly reduced, and the cleanness of the fluid is ensured. Meanwhile, the pump shell can be inserted into and pulled out of the stator shell, so that when the pump body is damaged or the pump body cannot be continuously used due to the sanitary requirement (for example, when the pump body is used as a blood pump), only the pump body needs to be replaced, the stator assembly does not need to be replaced, the stator assembly can be repeatedly utilized, the replacement cost can be reduced, the resource waste can be reduced, and the resource utilization rate of the suspension type centrifugal pump is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of an embodiment of a suspension centrifugal pump of the present invention;

FIG. 2 is a schematic diagram showing the separation of the pump body and stator assembly of the centrifugal pump of FIG. 1;

FIG. 3 is a cross-sectional view of the pump body and stator assembly of FIG. 1;

FIG. 4 is a schematic structural view of the pump body of FIG. 3;

FIG. 5 is a schematic structural diagram of the first suspension module shown in FIG. 3;

FIG. 6 is a top view of the first suspension module of FIG. 5;

FIG. 7 is a cross-sectional view of the first levitation module of FIG. 5;

FIG. 8 is a schematic view of a second permanent magnet ring of the rotor assembly of FIG. 3;

fig. 9 is a schematic structural diagram and a schematic magnetic pole distribution diagram of another embodiment of the second permanent magnetic ring of the suspension centrifugal pump of the present invention;

fig. 10 is an exploded view of a first magnetic levitation module and a second magnetic levitation module of another embodiment of the centrifugal pump of the present invention;

fig. 11 is an exploded view of the first magnetic levitation module of fig. 10.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a floated centrifugal pump can be used as blood pump or other liquid pumps, also can be used as the air pump.

In the embodiment of the present invention, please refer to fig. 1 to fig. 8, the centrifugal pump includes a stator assembly 20 and a pump body 30, the stator assembly 20 includes a stator housing 200 and a first magnetic suspension module disposed in the stator housing 200, the stator housing 200 is provided with a socket 202 and an accommodating space 201 communicating the socket 202. The pump body 30 comprises a pump housing 31, a rotor assembly 10 and an impeller 32, the pump housing 31 is provided with an impeller chamber 301, a fluid inlet 302 and a fluid outlet 303, and the fluid inlet 302 and the fluid outlet 303 are both communicated with the impeller chamber 301; the impeller 32 is fixed on the rotor assembly 10, the rotor assembly 10 and the impeller 32 are rotatably arranged in the impeller chamber 301, and the rotor assembly 10 is provided with a second magnetic suspension module matched with the first magnetic suspension module. The pump housing 31 is removably mounted in the accommodating space 201, and when the pump housing 31 is inserted in the accommodating space 201, the first magnetic suspension module and the second magnetic suspension module cooperate to suspend the rotor assembly 10 in the impeller chamber 301.

Specifically, the axis of rotation of the shaft assembly is collinear with the axis of the impeller 32, and the impeller 32 is configured to force fluid received at the fluid inlet 302 through the impeller chamber 301 and to the fluid outlet 303. The pump housing 31 is mounted in the accommodating space 201 in a pluggable manner by a plug, wherein the accommodating space 201 can be separated from an inner cavity of the stator housing 200, for example, the top of the stator housing 200 is recessed to form the accommodating space 201. The accommodating space 201 may also be communicated with the inner cavity of the stator housing 200, for example, only the socket 202 is provided on the stator housing 200, and a part of the space in the stator housing 200 corresponding to the socket 202 is empty, so as to form the accommodating space 201 for inserting the pump housing 31, i.e., the accommodating space 201 is separated from the rest of the inner cavity of the stator housing 200 without a partition.

When the pump housing 31 is inserted into the accommodating space 201 of the stator assembly 20, the rotor assembly 10 can be suspended in the impeller chamber 301 by using the principle of "like magnetic poles repel and opposite magnetic poles attract" between the excitation magnetic fields of the first and second magnetic levitation modules. And simultaneously generates driving force to drive the rotor assembly 10 and the impeller 32 to move in a suspension state. Therefore, no mechanical contact exists between the rotor assembly 10 and the pump shell 31, high acceleration and deceleration can be generated, mechanical abrasion is small, heat generated by friction when the rotor assembly 10 rotates can be reduced, the machine and the motor are easy to protect, and the pump is convenient to maintain, overhaul and replace, and is suitable for the fields of severe environments, extremely cleanness, no pollution and special needs. For example, when the centrifugal pump is a blood pump, blood coagulation and the like due to problems such as heat generated by friction between the rotor assembly 10 and the pump housing 31 can be reduced. And as a suspension centrifugal pump is used in the semiconductor industry, the cleanness of the fluid can be ensured.

The utility model discloses technical scheme is through setting up the stator assembly 20 and the pump body 30 of components of a whole that can function independently with floated centrifugal pump for stator assembly 20's stator shell 200 is equipped with socket 202 and the accommodation space 201 of intercommunication socket 202, rotatably locates the rotor assembly 10 in the pump shell 31 of the pump body 30, and impeller 32 is fixed on rotor assembly 10. When the pump housing 31 is inserted into the receiving space 201 through the socket 202, the first magnetic levitation module of the stator assembly 20 and the second magnetic levitation module of the rotor assembly 10 cooperate to levitate and rotate the rotor assembly 10 in the impeller chamber 301. Because no parts such as a shaft, a bearing and the like exist in the impeller chamber 301 in the pump body 30, the conditions that the fluid state is influenced (for example, blood coagulation is caused by heat generated by friction) and the fluid is polluted by heat, abrasion and the like generated by friction of the shaft and the bearing can be avoided, the influence of the pump on the fluid is greatly reduced, and the cleanness of the fluid is ensured. Meanwhile, the pump shell 31 can be inserted into the stator shell 200, and when the pump body 30 is damaged or the pump body 30 cannot be used continuously due to sanitary requirements (for example, when the pump is used as a blood pump), only the pump body 30 needs to be replaced, and the stator assembly 20 does not need to be replaced, so that the stator assembly 20 can be reused, the replacement cost can be reduced, the resource waste can be reduced, and the resource utilization rate of the suspension centrifugal pump is improved.

In some embodiments, the rotor assembly 10 includes a rotor housing 100, the impeller 32 has a flow guiding surface, the flow guiding surface is provided with a plurality of vanes 321, the plurality of vanes 321 are spaced around a rotation axis of the rotor assembly 10, the fluid inlet 302 is disposed toward the flow guiding surface, the rotor housing 100 and a side of the impeller 32 facing away from the flow guiding surface enclose a seal cavity 170, and the second magnetic levitation module is disposed in the seal cavity 170. Specifically, the fluid outlet 303 is located on the peripheral side of the impeller 32, and when fluid flows into the impeller chamber 301 from the fluid inlet 302, the fluid can be caused to flow toward the fluid outlet 303 by the impeller 32. The impeller 32 and the rotor housing 100 together enclose to form a sealed cavity 170 for accommodating the second magnetic suspension module, so that the size of the rotor housing 100 can be reduced, and the impeller 32 and the rotor housing 100 can be connected into an integral module.

Therefore, the structural compactness of the rotor assembly 10 and the impeller 32 can be improved, the structure of the pump body 30 is more compact, and the impeller 32 can be stably connected with the rotor assembly 10. In addition, the second magnetic suspension module is disposed in the sealed cavity 170, so that the second magnetic suspension module is prevented from contacting with the fluid (e.g., blood) entering the impeller chamber 301, and the second magnetic suspension module is prevented from being corroded by the fluid and being polluted by the fluid.

Of course, in other embodiments, the seal cavity 170 is formed within the rotor housing 100 and the impeller 32 is mounted outside of the rotor housing 100.

In some embodiments, the impeller 32 includes a rotating plate 322 and a supporting cylinder 324, the rotating plate 322 has a flow guiding surface, the supporting cylinder 324 is disposed on a side of the rotating plate 322 facing away from the flow guiding surface, an outer circumferential surface of the supporting cylinder 324 is spaced from a circumferential edge of the rotating plate 322, and the rotor housing 100 is disposed on an outer circumferential edge of the supporting cylinder 324 and forms the sealed cavity 170 together with the rotating plate 322 and the supporting cylinder 324. Specifically, the rotor case 100 includes an annular side wall and an annular bottom wall connected to one end of the annular side wall, an inner side of the annular bottom wall is connected to one end of the support cylinder 324 away from the rotation plate body 322, and one end of the annular side wall away from the annular bottom wall is connected to a peripheral portion of the rotation plate body 322. By the arrangement, the space size of the sealing cavity 170 can be matched with the size of the second magnetic suspension module, the structure between the rotor shell 100 and the impeller 32 is more compact, and the supporting position between the rotor shell 100 and the impeller 32 is more uniform.

Of course, in other embodiments, one end of the rotor housing 100 is open, and the side of the impeller 32 facing away from the flow guiding surface covers the opening of the rotor housing 100 to form the sealed cavity 170 with the rotor housing 100.

When the impeller 32 rotates, the fluid in the impeller chamber 301 gradually flows around, and the pressure at the outer peripheral portion of the impeller 32 is generally higher than the pressure at the central portion of the impeller 32. Of the high-pressure fluid at the outer peripheral portion of the impeller 32, a part of the high-pressure fluid may flow into the support cylinder 324 along the gap at the peripheral side of the rotor casing 100 and the gap at the side of the rotor casing 100 facing away from the blades 321, thereby increasing the pressure in the space inside the support cylinder 324. When the space inside the supporting cylinder 324 is larger than the pressure on the side of the rotating plate 322 facing away from the supporting cylinder 324, the impeller 32 and the rotor assembly 10 are caused to move in a biased manner toward the fluid inlet 302, which may cause the impeller 32 to interfere with the pump housing 31 and the second and first magnetic levitation modules to be biased.

To reduce the risk of an offset movement of the impeller 32 and the rotor assembly 10 in the direction of the fluid inlet 302, in some embodiments, the rotating plate body 322 is provided with a central hole 323, the central hole 323 is in communication with the space inside the support cylinder 324, the fluid inlet 302 is arranged towards the central hole 323, and the plurality of vanes 321 are distributed around the periphery of the central hole 323. The central hole 323 is formed in the rotating plate body 322, so that the central hole 323 is communicated with the space inside the support cylinder 324 and the space on the side of the rotating plate body 322, which is away from the support cylinder 324, so that the pressures on two sides of the rotating plate body 322 can be balanced, the pressure difference between the space inside the support cylinder 324 and the space on the side, which is away from the support cylinder 324, of the rotating plate body 322 is reduced, and the risk of the impeller 32 and the rotor assembly 10 moving in a direction of the fluid inlet 302 in a deviating manner can be reduced.

In some embodiments, the impeller 32 further includes a plurality of reinforcing ribs 325, and the plurality of reinforcing ribs 325 are distributed on the outer circumference of the supporting cylinder 324 and connected to the rotation plate 322. Specifically, the reinforcing rib 325 is provided at a connection portion of the outer side of the support cylinder 324 and the rotation plate body 322, and simultaneously connects the support cylinder 324 and the rotation plate body 322, so as to reinforce the structural strength between the support cylinder 324 and the rotation plate body 322 and reduce the risk of breakage of the impeller 32.

In some embodiments, the vanes 321, the rotating plate body 322, and the support cylinder 324 are integrally formed. That is, the impeller 32 is an integrally formed structure, which facilitates the formation of the impeller 32, reduces the assembling processes of the impeller 32, and improves the assembling efficiency of the pump body 30.

In some embodiments, the outer edge of the vane 321 is disposed to protrude toward the outer periphery of the flow guide surface (the rotating plate body 322). Therefore, the length of the vane 321 can be made longer, and the flow guiding path of the vane 321 to the fluid can be increased, so that the fluid can be better driven to flow to the fluid outlet 303.

In other embodiments, the outer edges of the vanes 321 are disposed flush with the outer periphery of the flow guide surface (the rotating plate body 322). With such an arrangement, the impeller 32 can be made compact, which is advantageous for reducing the size of the pump body 30.

Of course, in other embodiments, the outer edge of the vane 321 is located inside the outer periphery of the flow guide surface (the rotating plate body 322) and is spaced apart from the outer periphery of the flow guide surface (the rotating plate body 322).

In some embodiments, the pump housing 31 includes a first housing 311 and a second housing 314, the first housing 311 includes a mounting housing portion 312 and a connecting housing portion 313, the mounting housing portion 312 is disposed with one end open, the connecting housing portion 313 is connected to an open end of the mounting housing portion 312 and extends toward a lateral side of the connecting housing portion 313, the connecting housing portion 313 is provided with the fluid outlet 303; the second housing 314 is provided with a fluid inlet 302 and is connected to a peripheral portion of the connecting shell portion 313 to form the impeller chamber 301 with the first housing 311, the rotor assembly 10 is mounted in the mounting shell portion 312, and the mounting shell portion 312 is mounted in the accommodating space 201 in a pluggable manner.

Specifically, the first housing 311 and the second housing 314 are distributed in the axial direction of the impeller 32, and are sealingly engaged with each other. The second housing 314, the connecting shell portion 313 and the mounting shell portion 312 together enclose to form the impeller chamber 301, wherein the size of the mounting shell portion 312 is smaller than that of the connecting shell portion 313, so that the mounting shell portion 312 can be limited by the connecting shell portion 313 when inserted into the accommodating space 201, and a guide flow passage can be formed by a portion of the connecting shell portion 313 close to the periphery, so that fluid thrown out of the impeller 32 can better flow to the fluid outlet 303 along the guide flow passage.

Of course, in other embodiments, the fluid outlet 303 may be provided in the second housing 314. In other embodiments, the pump housing may be generally cylindrically configured throughout.

The stator assembly 20 and the rotor assembly 10 may be suspended and rotated in various ways, for example, in some embodiments, the second magnetic suspension module includes a first permanent magnet ring 110, a first iron core ring 120, a second permanent magnet ring 140, and a second iron core ring 130, which are coaxially disposed, the first permanent magnet ring 110 and the first iron core ring 120 are located above the second iron core ring 130, and the second permanent magnet ring 140 is disposed around the outer circumferential surface of the second iron core ring 130.

The first magnetic suspension module comprises a stator permanent magnet ring 210, a stator core 241 ring 220, a magnetic conductive disc 260, a displacement sensor 230 and a plurality of coil windings 240 which are arranged in a stator shell 200, wherein the coil windings 240 comprise a stator core 241, a suspension coil 242 and a driving coil 243 which extend vertically, the suspension coil 242 and the driving coil 243 are respectively sleeved on the stator core 241 vertically, and the plurality of coil windings 240 are uniformly distributed around the accommodating space 201 along the circumferential direction; the stator permanent magnet ring 210 and the stator core 241 are arranged above the stator core 241, the stator permanent magnet ring 210 and the stator core 241 are arranged around the accommodating space 201, the lower end of the stator core 241 is abutted and fixed to the magnetic conductive disc 260, and the suspension coil 242 and the driving coil 243 are located on one side of the magnetic conductive disc 260 facing the accommodating space 201.

The displacement sensor 230 is used for detecting the radial offset of the rotor assembly 10 in the accommodating space 201, the suspension coil 242 is connected with the displacement sensor 230, and the suspension coil 242, the stator core 241, the magnetic conductive disc 260, the second core ring 130 and the second permanent magnet ring 140 form a suspension magnetic circuit system, so that the rotor assembly 10 is suspended in the impeller chamber 301; the stator permanent magnet ring 210, the stator core 241 ring 220, the first permanent magnet ring 110 and the first core ring 120 form a reinforced magnetic circuit system to enhance the axial suspension force of the rotor assembly 10; the driving coil 243, the stator core 241, the magnetic conductive disc 260, the second core ring 130 and the second permanent magnet ring 140 form a driving and rotating magnetic circuit system, so that the rotor assembly 10 rotates in the impeller chamber 301.

It should be noted that, in this embodiment, the pump housing 31 may be installed in the accommodating space 201 in a pluggable manner, or the pump housing 31 may be fixed (non-detachable) in the accommodating space 201; the part of the pump housing 31 provided with the first magnetic suspension module is located in the accommodating space.

Specifically, the rotor assembly 10 includes a rotor housing 100, the impeller 32 and the rotor housing 100 enclose a sealed cavity 170, and the second magnetic levitation module is disposed in the sealed cavity 170. The rotor assembly 10 and the stator assembly 20 are isolated from each other by the pump housing 31, and in the rotor assembly 10, the radial dimensions of the first permanent magnet ring 110, the first core ring 120, and the second permanent magnet ring 140 are preferably the same, and the inner circumferential surface of the second permanent magnet ring 140 abuts against the outer circumferential surface of the second core ring 130, and the outer circumferential surface of the second permanent magnet ring 140 abuts against the inner circumferential surface of the rotor housing 100, so that the second permanent magnet ring 140 can be held and fixed in the rotor housing 100. The first iron core ring 120, the second iron core ring 130, the stator core 241 ring 220, the stator core 241 and the magnetic conductive plate 260 are all made of soft magnetic materials, do not produce a magnetic field (magnetic lines of force) and only play a role in magnetic line transmission in a magnetic circuit, and the first iron core ring 120, the second iron core ring 130, the stator core 241 ring 220, the stator core 241 and the magnetic conductive plate 260 are made of soft iron, A steel, soft magnetic alloy and the like with high magnetic permeability, or made of yoke iron made of silicon steel sheets in a stacking mode. For the stator assembly 20, the lower ends of all the stator cores 241 are abutted to the magnetic conductive disk 260, so that the magnetic fields generated by the suspension coil 242 and the driving coil 243 conduct magnetic lines through the stator cores 241 and the magnetic conductive disk 260, and further, the magnetic fields generated by the suspension coil 242 and the driving coil 243 are concentrated in the upper space of the magnetic conductive disk 260.

When the pump body 30 is correctly mounted on the stator assembly 20 and the levitation coil 242 is energized, the levitation coil 242 generates a levitation magnetic field, the levitation coil 242, the stator core 241, the magnetic conductive disc 260, the second core ring 130, the magnetic conductive disc 260, and the second permanent magnet ring 140 form a closed magnetic circuit, i.e., a levitation magnetic circuit system, and at this time, the rotor assembly 10 is acted by a magnetic levitation force and statically suspended in the impeller chamber 301. When the levitation coil 242 and the driving coil 243 are simultaneously energized, the rotor assembly 10 is in a levitation state, and the driving coil 243, the stator core 241, the magnetic conductive plate 260, the second core ring 130 and the second permanent magnet ring 140 form a closed magnetic circuit, i.e., a rotating magnetic circuit system, so that the rotor assembly 10 rotates in a levitation manner in the impeller chamber 301. The driving coil 243 drives the rotor assembly 10 to rotate in a similar operation principle as the permanent magnet synchronous motor, and will not be described in detail here. It should be noted that the levitation coil 242 and the driving coil 243 operate independently, and the magnitude, frequency and waveform of the current flowing through the levitation coil 242 and the driving coil 243 are different, so as to avoid the phenomenon of magnetic field coupling between the generated levitation magnetic field and the driving rotating magnetic field.

In the process of suspending the rotor assembly 10, when the rotor assembly 10 deviates in the radial direction (horizontal direction), a signal of the displacement sensor 230 is changed, and a deviation signal detected by the displacement sensor 230 is transmitted to the suspension coil 242 through a processing unit (including, but not limited to, an amplifying circuit, a comparing circuit, etc.), so as to adjust a current parameter of the suspension coil 242, destroy an original suspension magnetic field balance state, generate a maxwell pulling force opposite to the radial deviation direction, and restore the rotor assembly 10 to an original suspension position. The stator permanent magnet ring 210, the stator core 241 ring 220, the first permanent magnet ring 110, and the first core ring 120 form a closed magnetic circuit, so as to form a reinforced magnetic circuit system, which can enhance the suspension force (suspension stiffness) of the rotor assembly 10 in the axial direction, and when the rotor assembly 10 is offset in the axial direction (vertical direction), it can be known according to the minimum magnetic resistance principle: the first permanent magnet ring 110 and the first iron core ring 120 generate opposite axial magnetic pulling forces with respect to the stator permanent magnet ring 210 and the stator iron core 241 ring 220, so as to restore the rotor assembly 10 to the original suspension position. In this way, both the radial offset and the axial offset of the rotor assembly 10 can be effectively suppressed, so as to greatly improve the suspension stability of the rotor assembly 10 in the suspension state.

It can be understood that, for the first permanent magnet ring 110 and the stator permanent magnet ring 210, in order to form a closed magnetic circuit, the first permanent magnet ring 110 and the stator permanent magnet ring 210 are axially magnetized, and the magnetizing directions of the two permanent magnet rings are opposite.

By forming a suspension magnetic circuit system, a rotating magnetic circuit system and a strengthening magnetic circuit system between the stator assembly 20 and the rotor assembly 10, on one hand, the suspension force (suspension rigidity) of the rotor assembly 10 in the axial direction is strengthened, and on the other hand, the radial offset and the axial offset of the rotor assembly 10 are effectively inhibited, so that the suspension stability of the rotor assembly 10 is greatly improved.

Further, in this embodiment, the second permanent magnet ring 140 includes a plurality of pairs of permanent magnet segments 141 arranged at intervals along the outer circumferential surface of the second core ring 130, each pair of permanent magnet segments 141 is symmetrically arranged along the axis of the rotor assembly 10, the magnetizing direction of each permanent magnet segment 141 is radial, and the magnetizing directions of adjacent permanent magnet segments 141 are opposite. Thus, when the driving coil 243 is energized, a rotational driving force is generated between the second permanent magnet ring 140 and the driving coil 243, thereby driving the rotor assembly 10 to rotate in the impeller chamber 301. The plurality of permanent magnet segments 141 are preferably uniformly distributed along the outer circumferential surface of the second core ring 130 so that the rotor assembly 10 can be uniformly driven by the rotational driving force. Further, for the coil windings 240, the levitation coil 242 is preferably positioned below the drive coil 243 such that the drive coil 243 is disposed relatively close to the rotor assembly 10 to generate a stronger rotational drive force to better drive the rotor assembly 10 to rotate.

In order to fix the second permanent magnet ring 140, a sector-shaped separating block 142 is filled and fixed between two adjacent sector-shaped permanent magnet tiles 141, and the sector-shaped separating block 142 and the sector-shaped permanent magnet tiles 141 are sequentially spliced to form a closed ring. In this way, due to the presence of the sectorial partition stopper 142, both circumferential ends of the sectorial permanent magnet tiles 141 are abutted and fixed, thereby fixing the sectorial permanent magnet tiles 141. It can be understood that the permanent magnet segments 141 are clamped and fixed between the inner circumferential surface of the rotor housing 100 and the outer circumferential surface of the second core ring 130.

It should be noted that the second permanent magnet ring 140 has another modified structure, and referring to fig. 9, for example, the second permanent magnet ring 140 is a circular ring-shaped magnetic ring that is charged radially outward and charged with multiple poles at the outer diameter, the charging directions of the circular ring-shaped magnetic ring are alternately and oppositely arranged in the circumferential direction, and the number of the magnetic poles of the circular ring-shaped magnetic ring is even.

Further, the rotor assembly 10 further includes a blocking ring 150, and the first permanent magnet ring 110, the first iron core ring 120, the blocking ring 150, and the second permanent magnet ring 140 are sequentially arranged in an abutting manner from top to bottom along the vertical direction in the rotor housing 100. By providing the blocking ring 150, the first core ring 120 and the second permanent magnet ring 140 can be prevented from contacting each other, thereby reducing magnetic circuit interference. And because the blocking ring 150 is arranged, the first permanent magnet ring 110, the first iron core ring 120, the blocking ring 150 and the second permanent magnet ring 140 are all clamped and fixed between the upper end surface and the lower end surface of the rotor shell 100, thereby realizing the stability of the internal structure of the rotor assembly 10. It should be noted that the blocking ring 150 and the fan-shaped blocking blocks 142 can be made of plastic or ceramic, which does not affect the passing of the magnetic force lines and the conduction direction of the magnetic force lines.

The stator assembly 20 further comprises a fixed plate 250 and a magnetic conductive plate 260, and the upper end of the stator core 241 is inserted and fixed in the fixed plate 250; both the suspension coil 242 and the drive coil 243 are located between the fixed disk 250 and the magnetically permeable disk 260. The fixed disk 250 and the magnetically permeable disk 260 cooperate to secure the coil winding 240.

Further, the stator core 241 includes a core bar 241a and a yoke portion 241b, the yoke portion 241b extends horizontally from the top end of the core bar 241a, and the yoke portion 241b is disposed toward the axial direction of the stator assembly 20; the yoke portion 241b is provided corresponding to the second permanent magnet ring 140. The yoke portion 241b plays a role of conducting magnetic lines of force in the magnetic circuit, thereby facilitating formation of a levitating magnetic circuit system and a rotating magnetic circuit system.

In the present embodiment, the displacement sensor 230 is located at the gap formed by the stator permanent magnet ring 210 and the stator core 241, the displacement sensor 230 is an eddy current sensor, and the displacement sensor 230 extends horizontally and is disposed toward the axial direction of the stator assembly 20. The detecting surface of the displacement sensor 230 is disposed toward the outer circumferential surface of the rotor assembly 10, so that when the rotor assembly 10 is radially offset, the displacement sensor 230 generates a corresponding electrical signal.

Further, the number of the displacement sensors 230 is two, two displacement sensors 230 are distributed along the circumferential direction of the stator assembly 20 and in the same horizontal plane, and the two displacement sensors 230 are distributed at an included angle of a certain interval. In this way, the sensitivity and accuracy of the displacement sensor 230 in detecting the radial displacement of the rotor assembly 10 can be improved.

For the distribution structure of the displacement sensors 230, the following methods are also possible: the number of the displacement sensors 230 is at least three, and the plurality of displacement sensors 230 are in the same horizontal plane and are uniformly distributed at intervals along the circumferential direction of the stator assembly 20. For example, the displacement sensors 230 may be one (or more) and distributed at intervals of degrees (or degrees). Preferably, the number of the displacement sensors 230 is four, and two displacement sensors 230 are grouped together to form a differential circuit system, so as to further improve the sensitivity and accuracy of the displacement sensors 230 for detecting the radial offset of the rotor assembly 10.

In order to facilitate the installation of the fixed displacement sensor, in the present embodiment, an installation ring 270 is disposed between the stator permanent magnet ring 210 and the upper end of the stator core 241, the installation ring 270 is clamped and fixed between the stator permanent magnet ring 210 and the stator core 241, the installation ring 270 is disposed coaxially with the stator permanent magnet ring 210, and the radial dimensions of the installation ring 270 and the stator permanent magnet ring 210 are the same. The mounting ring 270 is provided with a mounting hole for fixing the displacement sensor 230 along the radial direction thereof, thereby fixing the displacement sensor 230. The mounting ring 270 may be made of plastic or ceramic material, which does not affect the passage of the magnetic lines of force and does not affect the conduction direction of the magnetic lines of force.

Referring to fig. 1, fig. 2, fig. 10 and fig. 11, in another embodiment, the second magnetic levitation module includes a first permanent magnet ring 110, a rotor core ring 160 and a second permanent magnet ring 140, which are sequentially arranged from top to bottom along the vertical direction and coaxially arranged;

the first magnetic suspension module comprises a suspension module, a driving rotation module and a displacement sensor 230, which are arranged in the stator housing 200, wherein the displacement sensor 230 is used for detecting the radial offset of the rotor assembly 10, and the first magnetic suspension module comprises:

the suspension module includes: the plurality of first cores 281, the plurality of suspension coils 242, the first magnetic conductive disc 291 and the stator permanent magnet ring 210 are vertically arranged, the lower end of the first core 281 is abutted and fixed to the first magnetic conductive disc 291, and the plurality of first cores 281 are distributed at intervals along the circumferential direction of the first magnetic conductive disc 291 and are located outside the accommodating space 201; each first iron core 281 is correspondingly wound with a suspension coil 242, and the suspension coil 242 is connected with the displacement sensor 230;

the driving rotation module comprises a plurality of second iron cores 282, a plurality of driving coils 243 and a second magnetic conductive disc 292, wherein the second iron cores 282 are vertically arranged, the lower ends of the second iron cores 282 are abutted and fixed on the second magnetic conductive disc 292, the plurality of second iron cores 282 are distributed at intervals along the circumferential direction of the second magnetic conductive disc 292, and each second iron core 282 is correspondingly wound with one driving coil 243;

the stator permanent magnet ring 210 is arranged corresponding to the first permanent magnet ring 110, and the first permanent magnet ring 110 and the stator permanent magnet ring 210 form a reinforced magnetic circuit system to enhance the axial suspension force of the rotor assembly 10; the rotor core ring 160, the second permanent magnet ring 140, the first core 281, the suspension coil 242, and the first magnetic conductive disc 291 form a suspension magnetic circuit system, so that the rotor assembly 10 is suspended in the impeller chamber 301; the rotor core ring 160, the second permanent magnet ring 140, the second iron core 282, the driving coil 243 and the second magnetic conductive disc 292 form a driving and rotating magnetic circuit system to drive the rotor assembly 10 to rotate in the impeller chamber 301.

In this embodiment, the pump housing 31 may be installed in the accommodating space 201 in a pluggable manner, or the pump housing 31 may be fixed (non-detachable) in the accommodating space 201; the part of the pump housing 31 provided with the first magnetic suspension module is located in the accommodating space.

Specifically, in this embodiment, the structure and connection relationship of the pump housing 31, the impeller 32 and the rotor housing 100 can refer to the embodiment of fig. 1 to 5, which is not described in detail herein. The interior of the rotor assembly 10 and the stator assembly 20 is isolated by a pump housing 31. In the rotor assembly 10, the first permanent magnet ring 110, the rotor core ring 160, and the second permanent magnet ring 140 preferably have the same outer diameter, and the first permanent magnet ring 110, the rotor core ring 160, and the second permanent magnet ring 140 are sequentially arranged in a vertical abutting manner in the rotor housing 100. For the stator assembly 20, it mainly includes a levitation module, a driving rotation module and a displacement sensor 230, the levitation module mainly functions to provide levitation force to the rotor assembly 10, and the driving rotation module mainly functions to provide rotational driving force to the rotor assembly 10. The rotor core ring 160, the first iron core 281, the first magnetic conductive disk 291, the second iron core 282, and the second magnetic conductive disk 292 are all made of soft magnetic materials, do not produce a magnetic field (magnetic lines of force) and only function as magnetic line transmission in a magnetic circuit, and the rotor core ring 160, the first iron core 281, the first magnetic conductive disk 291, the second iron core 282, and the second magnetic conductive disk 292 are made of soft iron, a steel, soft magnetic alloy and the like with relatively high magnetic permeability, or made of yokes made of stacked silicon steel sheets, which is not limited herein.

When the pump body 30 is correctly mounted on the stator assembly 20 and the levitation coil 242 is energized, the levitation coil 242 generates a levitation magnetic field, and magnetic lines of force generated by the levitation coil 242 are conducted along the first iron core 281 and the first magnetic conductive disc 291, at this time, the rotor iron core ring 160, the second permanent magnet ring 140, the first iron core 281, the levitation coil 242 and the first magnetic conductive disc 291 constitute a closed levitation magnetic circuit system, so that the rotor assembly 10 is suspended in the impeller chamber 301. It should be noted that, in this scheme, when the rotor assembly 10 is in a suspended state, the stator permanent magnet ring 210 is disposed corresponding to the first permanent magnet ring 110, the first permanent magnet ring 110 and the stator permanent magnet ring 210 are both in the same horizontal height, the first permanent magnet ring 110 and the stator permanent magnet ring 210 are both in an axial magnetization mode, and the magnetization directions of the first permanent magnet ring 110 and the stator permanent magnet ring 210 are opposite, so that the first permanent magnet ring 110 and the stator permanent magnet ring 210 form a closed strengthened magnetic circuit system, which can enhance the suspension force (suspension stiffness) of the rotor assembly 10 in the axial direction, and when the rotor assembly 10 is shifted in the axial direction (vertical direction), it can be known according to the minimum magnetic resistance principle: an opposite axial magnetic pulling force is generated between the first permanent magnet ring 110 and the stator permanent magnet ring 210, so that the rotor assembly 10 is restored to the original suspension position. In this way, the axial deviation of the rotor assembly 10 can be effectively suppressed, so as to greatly improve the suspension stability of the rotor assembly 10 in the suspension state.

When the levitation coil 242 and the driving coil 243 are simultaneously energized, the rotor assembly 10 is in a levitation state, magnetic lines of force generated by the driving coil 243 are conducted along the second iron core 282 and the second magnetic conductive disc 292, and the rotor iron core ring 160, the second permanent magnet ring 140, the second iron core 282, the driving coil 243 and the second magnetic conductive disc 292 form a closed driving rotation magnetic circuit system, so that the rotor assembly 10 can rotate while being levitated. The driving coil 243 drives the rotor assembly 10 to rotate in a similar operation principle as the permanent magnet synchronous motor, and will not be described in detail here. It should be noted that the levitation coil 242 and the driving coil 243 operate independently, and the magnitude, frequency and waveform of the current flowing through the levitation coil 242 and the driving coil 243 are different, so as to avoid the phenomenon of magnetic field coupling between the generated levitation magnetic field and the driving rotating magnetic field.

In the process of suspending the rotor assembly 10, when the rotor assembly 10 deviates in the radial direction (horizontal direction), a signal of the displacement sensor 230 is changed, and a deviation signal detected by the displacement sensor 230 is transmitted to the suspension coil 242 through a processing unit (including, but not limited to, an amplifying circuit, a comparing circuit, etc.), so as to adjust a current parameter of the suspension coil 242, destroy an original suspension magnetic field balance state, generate a maxwell pulling force opposite to the radial deviation direction, and restore the rotor assembly 10 to an original suspension position.

By forming a suspension magnetic circuit system, a rotating magnetic circuit system and a reinforced magnetic circuit system between the stator assembly 20 and the rotor assembly 10, on one hand, the suspension force (suspension stiffness) of the rotor assembly 10 in the axial direction is enhanced, and on the other hand, both the radial offset and the axial offset of the rotor assembly 10 are effectively suppressed, so that the suspension stability of the rotor assembly 10 is greatly improved.

In this embodiment, the second magnetic conductive plate 292 is detachably fixed to the first magnetic conductive plate 291 (e.g., by a screw connection or a snap connection), and in order to further suppress the coupling of the magnetic field generated by the levitation coil 242 and the driving coil 243, a barrier (not shown) for blocking the conduction of the magnetic force lines is disposed between the second magnetic conductive plate 292 and the first magnetic conductive plate 291. The blocking member may be made of aluminum or other non-magnetic materials (such as plastic and ceramic materials), so as to prevent the second magnetic conductive disk 292 from directly contacting the first magnetic conductive disk 291, thereby blocking the conduction of the magnetic lines inside the two disks. Of course, in some modified embodiments, the blocking member may also be implemented by forming a coating on the surface of the second magnetic conductive disk 292 and/or the first magnetic conductive disk 291, which is not limited herein.

Further, as for the second permanent magnet ring 140 of the rotor assembly 10, the second permanent magnet ring 140 may specifically include a plurality of permanent magnet columns 143 extending along the vertical direction, upper ends of the permanent magnet columns 143 are fixed to the lower end surface of the rotor core disc along the rotor core ring 160, and the plurality of permanent magnet columns 143 are distributed at intervals along the circumferential direction of the rotor core ring 160; the magnetizing direction of the permanent magnet columns 143 is axial magnetizing, and the magnetizing directions of two adjacent permanent magnet columns 143 are opposite. The number of the permanent magnetic columns 143 is even, preferably even, and the permanent magnetic columns are uniformly distributed at intervals. Of course, in other embodiments, the second permanent magnet ring 140 may also be composed of a plurality of permanent magnets with other shapes, and the number of the permanent magnets is determined according to the shapes of the permanent magnets, but the number of the permanent magnets is even and at least one. The second permanent magnet ring 140 with the above structure mainly functions to facilitate the concentration of the magnetic field to the lower side of the second permanent magnet ring 140, so as to further facilitate the suspension and rotation of the rotor assembly 10 under the action of the suspension module and the driving suspension module.

It is understood that the driving coil 243 for driving the levitation module can adopt a two-phase control method or a three-phase control method.

Further, the first iron core 281 includes an iron core bar 241a and a magnetic yoke portion 241b, the magnetic yoke portion 241b extends horizontally from the top end of the iron core bar 241a, the magnetic yoke portion 241b is disposed toward the axial direction of the stator assembly 20, and the bottom of the iron core bar 241a is inserted and fixed to the first magnetic conductive disc 291; when the rotor assembly 10 is suspended in the impeller chamber 301, the yoke portion 241b is disposed to correspond to the rotor core ring 160. The yoke portion 241b plays a role of conducting magnetic lines of force in the magnetic circuit, thereby facilitating the formation of a levitated magnetic circuit system.

In this embodiment, the stator housing 200 includes an upper end cover, a casing, and a lower end cover, the casing is cylindrical, the upper end and the lower end of the casing are both open, the upper end cover is installed at the upper port of the casing, and the upper end cover is installed at the lower port of the casing; the middle part of the upper end cover is provided with a socket 202, and a part corresponding to the socket 202 in the casing forms an accommodating space 201. The drive rotation module is located directly below the socket 202. The upper end cover and the lower end cover adopt a detachable connection mode to seal and cover the upper end opening and the lower end opening of the machine shell, and then the suspension module and the driving suspension module are both sealed in the stator shell 200. In addition, the lower side surface of the upper end cover may further be provided with a fixing groove b for accommodating and fixing the stator permanent magnet ring 210, so that the stator permanent magnet ring 210 is fixed at the upper end cover, and at this time, the stator permanent magnet ring 210 surrounds the outside of the accommodating space 201 along the circumferential direction; when the rotor assembly 10 is suspended in the impeller chamber 301a, the stator permanent magnet ring 210 may be at the same level as the first permanent magnet ring 110 of the rotor assembly 10, so as to form a closed reinforced magnetic circuit system.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A centrifugal suspension pump, comprising:

the stator assembly comprises a stator shell and a first magnetic suspension module arranged in the stator shell, wherein the stator shell is provided with a socket and an accommodating space communicated with the socket; and

the pump body comprises a pump shell, a rotor assembly and an impeller, wherein the pump shell is provided with an impeller chamber, a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are communicated with the impeller chamber; the impeller is fixed on the rotor assembly, the rotor assembly and the impeller are rotatably arranged in the impeller chamber, and the rotor assembly is provided with a second magnetic suspension module matched with the first magnetic suspension module;

the pump shell is installed in the containing space in a pluggable mode, and when the pump shell is inserted into the containing space, the first magnetic suspension module and the second magnetic suspension module are matched, so that the rotor assembly is suspended in the impeller chamber.

2. The centrifugal pump of claim 1, wherein said rotor assembly includes a rotor housing, said impeller having a flow directing surface, said flow directing surface having a plurality of vanes spaced about an axis of rotation of said rotor assembly, said fluid inlet being disposed toward said flow directing surface, said rotor housing enclosing a seal cavity with a side of said impeller facing away from said flow directing surface, said second magnetic levitation module being disposed within said seal cavity.

3. The centrifugal pump of claim 2, wherein said impeller includes a rotating plate and a supporting cylinder, said rotating plate is provided with said flow guiding surface, said supporting cylinder is provided on a side of said rotating plate facing away from said flow guiding surface, an outer circumferential surface of said supporting cylinder is spaced from a circumferential edge of said rotating plate, said rotor housing is provided on an outer circumferential edge of said supporting cylinder, and said rotor housing, said rotating plate and said supporting cylinder together enclose said sealed cavity.

4. The centrifugal pump of claim 3, wherein said rotating plate has a central hole communicating with a space inside said supporting cylinder, said fluid inlet is disposed toward said central hole, and a plurality of said vanes are distributed around the outer periphery of said central hole.

5. The centrifugal pump of claim 3, wherein said impeller further comprises a plurality of reinforcing ribs disposed around the periphery of said support cylinder and connected to said rotor plate; and/or the blades, the rotating plate body and the supporting cylinder are integrally formed.

6. The centrifugal pump of any one of claims 2 to 5, wherein the outer edge of said vane extends toward the outer periphery of said flow-guiding surface; alternatively, the first and second electrodes may be,

the outer edge of the blade is flush with the outer periphery of the flow guide surface; alternatively, the first and second electrodes may be,

the outer edge of the blade is positioned on the inner side of the outer periphery of the flow guide surface and is arranged at intervals with the outer periphery of the flow guide surface.

7. The centrifugal pump of claim 1, wherein said pump casing comprises a first casing and a second casing, said first casing comprising a mounting shell portion and a connecting shell portion, said mounting shell portion being disposed in an open end, said connecting shell portion being connected to an open end of said mounting shell portion and extending laterally of said connecting shell portion, said connecting shell portion being provided with said fluid outlet;

the second housing is provided with the fluid inlet and is connected to the peripheral part of the connecting shell part to form the impeller chamber by enclosing with the first housing, the rotor assembly is installed in the installation shell part, and the installation shell part is installed in the accommodating space in a pluggable manner.

8. The centrifugal pump according to any one of claims 1 to 5, wherein the second magnetic levitation module comprises a first permanent magnet ring, a first iron core ring, a second permanent magnet ring, and a second iron core ring, which are coaxially disposed, the first permanent magnet ring and the first iron core ring are located above the second iron core ring, and the second permanent magnet ring surrounds an outer circumferential surface of the second iron core ring;

the first magnetic suspension module comprises a stator permanent magnet ring, a stator iron core ring, a magnetic conductive disc, a displacement sensor and a plurality of coil windings, the stator permanent magnet ring, the stator iron core ring, the magnetic conductive disc, the displacement sensor and the coil windings are arranged in the stator shell, the coil windings comprise a stator iron core, a suspension coil and a driving coil, the stator iron core, the suspension coil and the driving coil extend vertically, the suspension coil and the driving coil are respectively sleeved on the stator iron core vertically, and the plurality of coil windings are uniformly distributed around the accommodating space circumferentially; the stator permanent magnet ring and the stator iron core ring are arranged above the stator iron core, the stator permanent magnet ring and the stator iron core ring are arranged around the accommodating space, the lower end of the stator iron core is abutted and fixed to the magnetic conduction disc, and the suspension coil and the driving coil are positioned on one side, facing the accommodating space, of the magnetic conduction disc;

the displacement sensor is used for detecting the radial offset of the rotor assembly in the accommodating space, the suspension coil is connected with the displacement sensor, and the suspension coil, the stator iron core, the magnetic conductive disc, the second iron core ring and the second permanent magnet ring form a suspension magnetic circuit system so as to enable the rotor assembly to be suspended in the impeller chamber; the stator permanent magnet ring, the stator iron core ring, the first permanent magnet ring and the first iron core ring form a reinforced magnetic circuit system so as to enhance the axial suspension force of the rotor assembly; the driving coil, the stator core, the magnetic conductive disc, the second core ring and the second permanent magnet ring form a driving rotary magnetic circuit system, so that the rotor assembly rotates in the impeller chamber.

9. The centrifugal pump of claim 8, wherein said rotor assembly further comprises a spacer ring, and said first permanent magnet ring, said first core ring, said spacer ring, and said second permanent magnet ring are vertically arranged in an abutting relationship from top to bottom; and/or the presence of a gas in the gas,

the stator assembly further comprises a fixed disc, and the upper end of the stator core is fixedly inserted into the fixed disc; the suspension coil and the drive coil are both located between the fixed disk and the magnetically permeable disk.

10. The centrifugal pump according to any one of claims 1 to 5, wherein the second magnetic suspension module comprises a first permanent magnet ring, a rotor core ring and a second permanent magnet ring which are coaxially arranged in sequence from top to bottom along the vertical direction;

first magnetic suspension module is including locating suspension module, drive rotation module and displacement sensor in the stator shell, displacement sensor is used for detecting rotor assembly's radial skew, wherein:

the suspension module includes: the stator comprises a plurality of first iron cores, a plurality of suspension coils, a first magnetic conductive disc and a stator permanent magnetic ring, wherein the first iron cores are vertically arranged, the lower ends of the first iron cores are abutted and fixed on the first magnetic conductive disc, and the first iron cores are distributed at intervals along the circumferential direction of the first magnetic conductive disc and are positioned on the outer side of the accommodating space; each first iron core is correspondingly wound with one suspension coil, and the suspension coil is connected with the displacement sensor;

the driving rotation module comprises a plurality of second iron cores, a plurality of driving coils and second magnetic conduction disks, the second iron cores are vertically arranged, the lower ends of the second iron cores are abutted and fixed to the second magnetic conduction disks, the second iron cores are distributed at intervals along the circumferential direction of the second magnetic conduction disks, and each second iron core is correspondingly wound with one driving coil;

the stator permanent magnet ring is arranged corresponding to the first permanent magnet ring, and the first permanent magnet ring and the stator permanent magnet ring form a reinforced magnetic circuit system so as to enhance the axial suspension force of the rotor assembly; the rotor iron core ring, the second permanent magnet ring, the first iron core, the suspension coil and the first magnetic conductive disc form a suspension magnetic circuit system, so that the rotor assembly is suspended in the impeller chamber; the rotor iron core ring, the second permanent magnet ring, the second iron core, the driving coil and the second magnetic conductive disc form a driving rotary magnetic circuit system so as to drive the rotor assembly to rotate in the impeller chamber.

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