CN217938906U

CN217938906U - Magnetic suspension type centrifugal pump

Info

Publication number: CN217938906U
Application number: CN202221361724.5U
Authority: CN
Inventors: 韩志富; 吴文晋; 范庆麟; 张栩曼; 戴莹; 荆鹏飞; 宋国刚
Original assignee: Hangtiantaixin Technology Co ltd
Current assignee: Hangtiantaixin Technology Co ltd
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2022-12-02
Anticipated expiration: 2032-05-23

Abstract

The utility model discloses a magnetic suspension type centrifugal pump, the utility model discloses the rotary drive and the axial position control of rotor are completely independent in the utility model, and are located rotor body's both sides respectively, and control logic is fairly simple. And, the utility model discloses in can realize the full suspension operation of rotor through the magnetic force effect between moving magnetic ring and the static magnetic ring, do not have mechanical contact between rotor and the spiral case (being equivalent to the stator) like this, reduced generate heat, wearing and tearing and furthest's reduction produce the thrombus and cause to roll the possibility of destruction to blood cell: the radial suspension limit of the rotor can be realized by a moving magnetic ring and a static magnetic ring.

Description

Magnetic suspension type centrifugal pump

Technical Field

The utility model relates to a damping technical field, in particular to magnetic suspension type centrifugal pump.

Background

Heart failure (Heart failure, chinese) is colloquially the failure of the natural Heart to pump enough blood flow to maintain the blood circulation of the whole body. According to the statistics of WTO, about 15-20% of people suffer from heart failure in different degrees, the number of people hospitalized for heart failure over 65 years accounts for more than 50% of the total number of people hospitalized, and the fatality rate after 5 years is more than 50%. For heart failure patients, there are only three therapeutic approaches of conservative drug therapy, heart transplantation and ventricular assist. The effectiveness of drug therapy is poor, and heart transplantation is very difficult due to limited donors, so that a Ventricular Assist Device (VAD) becomes the most effective treatment approach for various types of end-stage heart failure recognized worldwide. The main component of the ventricular assist device is a Blood Pump (all known in english as Blood Pump). An inflow pipeline of a blood pump is generally connected with a left ventricle or a right ventricle of a human heart and is connected with an aorta or a pulmonary artery through an outflow pipeline, the pump is connected with a control driver (with power supply equipment), and the control driver controls the blood pump to output blood with certain pressure (generally ranging from 80 to 120 mmHg) and flow (generally ranging from 2 to 10L/min) so as to share the power demand of the human heart caused by normal activity of a human body.

In view of the limitation of the use environment of the blood pump, on the premise of meeting the function, how to make the blood pump have the characteristics of high integration and small volume is a technical problem which is always concerned by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a small, compact structure's magnetic suspension type centrifugal pump.

The utility model provides a magnetic suspension type centrifugal pump, which comprises a volute, a static magnetic ring and a rotor;

the volute is provided with a suspension cavity, a medium inlet and a medium outlet, the rotor is positioned in the suspension cavity, the static magnetic ring is fixed on the volute,

the rotor comprises a rotor body, a moving magnetic ring positioned on the rotor body and at least two blades; the moving magnetic ring and the static magnetic ring are coaxially arranged and are nested to limit the radial positions of the rotor body and the volute;

a magnetic steel assembly is fixed on the rotor body and comprises N first magnetic steels distributed along the circumferential direction, and magnetic poles of all the first magnetic steels are arranged in a staggered mode; a magnetic part is fixed at the rotor body and comprises at least one of a magnetic ring and an iron core;

the volute is packaged with a drive coil assembly opposite to the magnetic steel assembly, and the drive coil assembly is matched with the magnetic steel assembly to enable the rotor body to rotate circumferentially; the volute is fixed with a magnetic suspension coil assembly, and when the magnetic suspension coil assembly is electrified, the magnetic part and the magnetic suspension coil assembly generate axial force.

Optionally, a position sensor is further included for detecting an axial position of the rotor body;

or/and the adjacent first magnetic steel is tightly attached, or the magnetic steel assembly further comprises transverse magnetic conductive magnetic steel, the magnetic conductive magnetic steel is positioned between the two first magnetic steels, and all the magnetic conductive magnetic steel and all the first magnetic steel form a Halbach magnetic steel array.

Optionally, the magnetic steel assembly and the magnetic part are respectively disposed at the first end and the second end of the rotor body, and the driving coil assembly and the magnetic levitation coil assembly are respectively disposed at the first end and the second end of the volute.

Optionally, an inner cavity of the volute includes a first annular housing and a second annular housing, the first annular housing and the second annular housing are located at a first end and a second end of the volute, respectively, the first annular housing and the volute enclose a first sealing cavity for encapsulating the driving coil, the second annular housing and the volute enclose a second sealing cavity for encapsulating the magnetic levitation coil assembly, the levitation cavity is formed between the first annular housing and the second annular housing, the first annular housing and the second annular housing are both of a ceramic structure, the driving coil assembly is arranged by being attached to the first annular housing, and the magnetic levitation coil is arranged by being attached to the second annular housing.

Optionally, the rotor body includes an annular body and a base body, the annular body and the base body are fixedly connected in an axial direction, a liquid outlet is provided between the annular body and the base body, a central through hole of the annular body is communicated with the liquid outlet, the central through hole is coaxial with the medium inlet, each of the blades is located between the annular body and the base body, the magnetic steel assembly is encapsulated inside the annular body, and the moving magnetic ring and the magnetic member are encapsulated inside the base body.

Optionally, the base body has an annular encapsulation cavity, the movable magnetic ring is sleeved on an inner annular wall of the annular encapsulation cavity, the magnetic member encapsulated in the base body is located at the periphery of the movable magnetic ring, and the axial height of the middle area of the annular encapsulation cavity is greater than the axial height of the edge area along the radial direction.

Optionally, the magnetic shielding device further includes a base and a cover body, the cover body has a column casing with an opening at one end and a guiding cone connected to the other end of the column casing, the opening of the column casing is circumferentially and hermetically buckled to the base, the static magnetic ring is fixed to the base through a threaded component and is located inside the column casing, the base is in threaded sealing connection with the volute and is coaxial with the medium inlet, and the guiding cone passes through the central hole of the annular packaging cavity and protrudes toward the medium inlet.

Optionally, a first auxiliary channel is formed between the outer circumferential surface and the outer end surface of the annular body and the corresponding inner wall of the volute, a second auxiliary channel is formed between the outer circumferential surface and the outer end surface of the annular packaging cavity and the corresponding inner wall of the volute, and a second auxiliary channel is formed between the inner circumferential wall of the annular packaging cavity and the cover body, and the outer end surface of the annular body and the outer end surface of the seat body have a predetermined included angle with a horizontal plane, and the distance from the outer end surface to the horizontal plane increases from outside to inside.

Optionally, a plurality of protrusions are arranged on the outer end surfaces of the annular body and the seat body, the protrusions extend from the inner edge side to the outer edge side, a predetermined included angle is formed between each protrusion and the radial direction, and the distance between adjacent protrusions is smaller when the distance between adjacent protrusions is closer to the inner edge side or the height of each protrusion is lower when the distance between adjacent protrusions is closer to the inner edge side;

optionally, the rotor is of a centrifugal fully-closed rotor structure, the blades are backward-bent blades, the magnetic steel assembly and the magnetic part are respectively arranged at the first end and the second end of the rotor body, and the blades are located between the magnetic steel assembly and the magnetic part;

or/and the magnetic part comprises a magnetic ring.

The utility model discloses the rotary drive and the axial position control of well rotor are completely independent, and are located the both sides of rotor body respectively, and control logic is fairly simple. And, the utility model discloses in can realize the full suspension operation of rotor through the magnetic force effect between moving magnetic ring and the static magnetic ring, do not have mechanical contact between rotor and the spiral case (being equivalent to the stator) like this, reduced generate heat, wearing and tearing and furthest's reduction produce the thrombus and cause to roll the possibility of destruction to blood cell: the radial suspension limit of the rotor can be realized by a moving magnetic ring and a static magnetic ring.

Drawings

Fig. 1 is a schematic three-dimensional structure diagram of a magnetic suspension type centrifugal pump according to an embodiment of the present invention;

FIG. 2 is a cross-sectional three-dimensional view of a magnetically levitated centrifugal pump;

FIG. 3 is a schematic cross-sectional view of FIG. 1;

fig. 4 is a schematic structural diagram of a rotor according to an embodiment of the present invention;

FIG. 5 is a schematic view in section from another perspective of the rotor shown in FIG. 4;

fig. 6 is a schematic structural view of a rotor body according to an embodiment of the present invention;

fig. 7 is a schematic view of a rotor according to another embodiment of the present invention;

fig. 8 is a schematic view of a rotor according to still another embodiment of the present invention.

Wherein, in fig. 1 to 8:

100 rotors; 11, a seat body; 111 a lower cover plate; 112 annular seal cavity; 113 an inner peripheral wall; 12 an annular body; 121, an upper cover plate; 1211 outer end face; 1212 a bump; 13 blades; 14 magnetic steel components; 15 a magnetic member; 16 moving magnetic rings; 17 a magnetic member;

200 a volute; 201 a first volute; 202 a second volute; 203 a first annular housing; 204 a second annular housing; 21 driving the coil assembly; 211 driving the coil; 212 a working core; 22 a static magnetic ring; 23 a base; 24 a cover body; 241 column casing; 242 guide cones; a 26 position sensor; 27 a magnetic levitation coil assembly; 271 magnetic floating coil; 272 a magnetic floating iron core;

300 an inlet tube;

400 an outlet pipe;

1a first auxiliary flow channel; 1b a second auxiliary flow channel; 100a outlet port.

Detailed Description

In the description of the present invention, it should be noted that the terms "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description of the technical simplicity, and do not indicate or imply that the indicated device or element must have a specific orientation, a specific orientation configuration, and an operation, and thus, the limitation of the present invention cannot be understood. Furthermore, the terms "first," "second," and the like are used for convenience only to describe two or more structures or components that are identical or similar in structure and/or function, and do not denote any particular limitation as to order and/or importance.

Without loss of generality, the magnetic suspension type centrifugal pump is used for example to describe technical solutions and technical effects in the application of the magnetic suspension type centrifugal pump to blood pumping of the heart, and it should be understood by those skilled in the art that the magnetic suspension type centrifugal pump of the present invention provides a technical solution on the basis of research on the blood pump, but the magnetic suspension type centrifugal pump is not limited to be applied to blood pumping of the heart, and the application in other fields is still within the scope of protection herein.

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 3, fig. 1 is a schematic three-dimensional structure diagram of a magnetic suspension centrifugal pump according to an embodiment of the present invention; FIG. 2 is a cross-sectional three-dimensional view of a magnetically levitated centrifugal pump; fig. 3 is a schematic sectional structure view of fig. 1.

The utility model provides a magnetic suspension type centrifugal pump, including spiral case, static magnetic ring and rotor, the spiral case has suspension chamber, medium import and medium export, and the rotor is located suspension intracavity portion.

The volute may include a first volute 201 and a second volute 202, which enclose an installation space of the rotor, and the first volute 201 and the second volute 202 may be detachably installed, so as to facilitate installation and maintenance of components such as the rotor. The first volute 201 may be provided with a medium inlet, and the medium outlet may be defined by corresponding structures on the first volute 201 and the second volute 202. The medium inlet is mounted with the inlet pipe 300, the medium outlet is mounted with the outlet pipe 400, and the first volute 201, the second volute 202, the inlet pipe 300 and the outlet pipe 400 may all be titanium alloy material.

Referring to fig. 4 and 5, fig. 4 is a schematic structural diagram of a rotor according to an embodiment of the present invention; fig. 5 is a schematic view of the rotor of fig. 4 from another perspective.

The utility model provides a rotor includes rotor body, blade 13, moves magnetic ring 16, magnetic part 17 and magnet steel component 14.

The rotor body mainly provides a mounting base for mounting other parts of the rotor and is matched and assembled with the volute. A specific structure of the rotor body will be described later in detail. The moving magnetic ring 16, the blades 13, the magnetic part 17 and the magnetic steel assembly 14 are all mounted on the rotor body, the number of the blades 13 can be two or more, namely at least two, each blade is distributed along the circumferential direction, the blades 13 can be backward-bent blades, the backward-bent blades can obtain optimized fluid efficiency, shearing force and streamline distribution, the diameters of the rotor and the volute can be smaller under the same output flow and pressure requirements, the requirements on the rotating speed and the torque of the motor can be lower, the volumes of the volute, the rotor and the motor can be reduced, the miniaturization of the pump can be realized under the same output capacity condition, and the probability of hemolysis and thrombosis can be reduced to the greatest extent.

The number of vanes 13 may be determined by the particular pump volume and may typically be 3 to 7, for example 5 in one particular example.

Of course, the blade 13 may be a blade with equal thickness or a straight blade as long as the use requirement can be met.

The volute 200 is provided with a static magnetic ring 22, and the static magnetic ring 22 and the moving magnetic ring 16 are coaxially arranged and are nested to limit the radial positions of the rotor 100 and the volute 200. Both static ring 22 and dynamic ring 16 may include two or more ring magnets arranged in an axial direction. A specific example in which the static magnetic ring 22 and the moving magnetic ring 16 each have three annular magnetic rings is shown in fig. 3, and the moving magnetic ring 16 is nested with the outer periphery of the static magnetic ring 22. Of course, the number of annular magnetic rings in the static magnetic ring 22 and the dynamic magnetic ring 16 is not limited to the description herein, and may be other values.

In operation, the principle of the moving magnet ring 16 and the static magnet ring 22 defining the radial position of the rotor with respect to the volute 200 can be understood in conjunction with fig. 6 and 7, the radial suspension of the rotor is achieved by the repulsive force between the moving magnet ring and the static magnet ring, as described above, the rotor body is provided with a set of moving magnet rings; the volute is provided with a group of static magnetic rings; the moving magnetic ring and the static magnetic ring form a permanent magnetic radial suspension bearing. The static magnetic ring can adjust the axial position through the precise thread between the base 23 and the volute 200, and ideally, the position of the static magnetic ring 22 is adjusted, when the rotor body is suspended in the middle of the volute suspension cavity along the axial direction, the axial positions of the static magnetic ring 22 and the dynamic magnetic ring 16 are just aligned; at this time, the radial stiffness of the permanent magnetic radial suspension bearing formed by the moving magnetic ring 16 and the static magnetic ring 22 is maximum, and the axial force is 0.

The utility model provides a rotor body 'S first end is fixed with magnet steel assembly 14, and magnet steel assembly 14 includes a N first magnet steel 141 of arranging along circumference, and all first magnet steel 141' S magnetic pole staggered arrangement please refer to figure 4, and first magnet steel forms a week according to N utmost point, S utmost point alternate arrangement among the magnet steel assembly. Each magnetic steel in the magnetic steel assembly 14 may be packaged inside the rotor body. In one example, the first magnetic steels 141 can be tightly attached to each other to form a magnetic ring with a full polar arc, so that the disc motor formed by the driving coil assembly 21 mounted on the scroll casing 200 can obtain a larger motor efficiency.

Certainly, the magnetic steel assembly 14 may further include transverse magnetic steel 18, the magnetic steel 18 is located between the first magnetic steels 141, that is, the transverse magnetic steel 18 with the same number of mutual exclusions is arranged between the first magnetic steels 141 with staggered magnetic poles, for example, 10 groups of staggered first magnetic steels and magnetic steel form a Halbach magnetic steel array (4-16 even groups are all available, and 10 groups are an optional scheme), and this magnetic steel array can play a role of magnetic flux collection, and improves the magnetic density between the air gaps of the motor under the same magnetic steel volume, thereby further improving the motor efficiency.

Of course, the magnetic steel assembly 14 is not limited to the embodiments described herein, and may be provided in other embodiments as long as the functions described herein can be achieved.

Accordingly, the first end of the scroll 200 corresponding to the rotor mounted magnetic steel assembly 14 encloses a drive coil assembly 21, wherein the drive coil assembly 21 may include a drive coil 211 and a working core 212. During operation, the drive coil 211 is electrified to generate a magnetic field, the working iron core 212 amplifies the magnetic field generated by the drive coil 211, and the first magnetic steels 141 arranged in the staggered manner on the magnetic steel assembly 14 of the rotor body generate rotating force to drive the rotor body to rotate. The drive coil assembly 21 forms a disc motor with the magnetic steel assembly 14 mounted inside the rotor body.

When the magnetic suspension coil assembly 27 is energized, the magnetic member 17 and the magnetic suspension coil assembly 27 generate an axial force for controlling the axial position of the rotor body. By adjusting the current direction of the magnetic levitation coil assembly 27, the force direction between the magnetic levitation coil assembly 271 and the magnetic member 17 can be changed. The magnetic levitation coil assembly 27 can include a magnetic levitation coil 271 and a magnetic levitation core 272. Wherein the axial position of the rotor body can be known by means of a position sensor.

In the embodiment, the rotary driving and the axial position control of the rotor are completely independent and are respectively positioned at two sides of the rotor body, and the control logic is simpler. Furthermore, the utility model discloses in can realize the full suspension operation of rotor through the magnetic force effect between moving magnetic ring 16 and the static magnetic ring 22, do not have mechanical contact between rotor 100 and spiral case 200 (being equivalent to the stator) like this, reduced generate heat, wearing and tearing and furthest reduced the production thrombus and caused to roll the possibility of destruction to blood cell: the radial suspension limit of the rotor 100 can be realized by means of a moving magnetic ring and a static magnetic ring.

In this specific example, the inner cavity of the volute 200 has a first annular housing 203 and a second annular housing 204 therein, the first annular housing 203 and the second annular housing 204 are respectively located at the first end and the second end of the volute, the first annular housing 203 and the volute enclose a first sealed cavity encapsulating the drive coil, the second annular housing and the volute enclose a second sealed cavity encapsulating the magnetic suspension coil assembly, the suspension cavity is formed between the first annular housing and the second annular housing, both the first annular housing 203 and the second annular housing 204 are ceramic structures, the drive coil assembly 21 is arranged against the first annular housing 203, and the magnetic suspension coil 271 is arranged against the second annular housing 204.

Each annular housing may be bonded or otherwise secured to the volute.

Ceramic material and blood's compatibility preferred, ceramic material ten minutes is hard and insulating, and the wall thickness of annular casing can be thinner and the inner wall can be hugged closely to the drive coil like this to very big reduction the air gap between drive coil and the first magnet steel and eliminated eddy current loss completely, first magnet steel can adopt Halbach array to arrange, has improved the efficiency of motor, has realized the miniaturization of blood pump under the prerequisite that keeps the biggest output capacity unchangeable. Due to the ceramic insulation property, the risk that the driving coil generates leakage current on blood flowing in the volute can be reduced to the greatest extent, and the possibility that the driving coil assembly and the first magnetic steel assembly form a disc type motor and the operation of the disc type motor is interfered by an external electric field is eliminated. For example: when a patient receives electric shock/electric recovery/electrotome cutting treatment, the magnetic suspension type centrifugal pump can still work normally.

In an example, the rotor body includes an annular body 12 and a seat body 11, which are fixedly connected and arranged along an axial direction, each blade is located between the annular body 12 and the seat body 11, a liquid outlet is provided between the annular body 12 and the seat body 11, the liquid outlet can be located between two blades, a central through hole of the annular body 12 communicates with the liquid outlet 100a, magnetic steel assemblies are both packaged inside the annular body 12 and the seat body 11, and the moving magnetic ring 16 is packaged inside the seat body 11. The annular body 12 and the seat body are fixedly connected and arranged along the axial direction, a liquid outlet is arranged between the annular body 12 and the seat body 11, a central through hole of the annular body 12 is communicated with the liquid outlet, and the central through hole of the annular body 12 is coaxial with the medium inlet. The number of the liquid outlets 100a may be multiple and may be uniformly arranged along the circumferential direction, and the specific number may be determined according to a specific product, which is not limited herein.

Specifically, the base body is provided with an annular packaging cavity, the movable magnetic ring is sleeved on the inner annular wall of the annular packaging cavity, the magnetic piece packaged on the base body is positioned on the periphery of the movable magnetic ring, and the axial height of the middle area of the annular packaging cavity is greater than that of the edge area along the radial direction.

Therefore, the occupation of the packaging cavity on the fluid space in the pump can be reduced as much as possible, and the structure is compact.

For convenience of installation, the annular packaging cavity can be formed by arranging an annular groove on the base body, and covering the notch of the annular groove with the lower cover plate 111 to form a sealed cavity. Similarly, the sealing cavity for mounting the magnetic steel assembly on the annular body can also be formed by arranging an annular groove and sealing the upper cover plate 121 in a matching manner.

The utility model provides a rotor can be centrifugal totally enclosed rotor, and when centrifugal pump during operation, inside a large amount of blood flowed in the centrifugal pump through the inflow channel, after rotor centrifugal blade is with higher speed, flowed by the outflow channel, pours into blood into the aorta, provides pressure and flow for whole-body blood circulation. The rotor centrifugal blades may be hollow structures.

The static magnetic ring in the above embodiments can be installed inside the volute in the following manner.

In an example, the magnetic suspension type centrifugal pump may further include a base and a cover 24 fastened to the base 23, the cover 24 is fixed to the base in a sealing manner, the static magnetic ring is fixed to the base by a threaded component, and the threaded component may be a screw or a bolt or a screw rod. The static magnetic ring is arranged in an installation space formed by the cover body and the base, an installation through hole is formed in the second end of the volute, the installation through hole is coaxial with the medium inlet, and the base 23 is in threaded sealing connection with the installation through hole. The cover body 24 includes a cylinder 241 having one end open and a guide cone 242 connected to the other end of the cylinder, the static magnetic ring 22 is located inside the cylinder 241, and the guide cone 242 passes through the central hole of the holder body 11 and protrudes toward the medium inlet. The radial dimension of the guide cone 242 is smaller as it approaches the medium inlet, so that the fluid at the volute medium inlet can uniformly flow to the circumferential direction under the diversion of the guide cone, and then uniformly enter between the blades.

In the above embodiment, the base is in threaded connection with the volute, so that the axial position of the base relative to the volute can be accurately adjusted to be accurately matched with the moving magnetic ring on the rotor.

Referring to fig. 6 and 7, in each of the above embodiments, the outer end surface of the annular body 12 and the outer end surface of the seat body are both provided with a plurality of protrusions 1212 (only the protrusions on the outer end surface of the annular body are shown in the drawings), the protrusions extend from the inner edge side to the outer edge side, and the protrusions 1212 have a predetermined included angle with the radial direction, and the distance between adjacent protrusions is smaller closer to the inner edge side, so that the protrusions 1212 have an internal spiral structure. Therefore, the dynamic pressure liquid floating bearing is formed between the outer end surface of the annular body and the first annular shell and between the outer end surface of the seat body and the second annular shell. When the rotor is greatly disturbed in the axial direction and one end of the rotor is close to the annular shell on the side, the dynamic pressure liquid floating bearing can provide extra restoring force towards the center, so that the stability of the impeller in the axial direction is improved.

Of course, the lower the height of the protrusion 1212 closer to the inner edge, the same technical effect can be achieved, as shown in fig. 7.

In one embodiment, a first auxiliary channel is formed between the outer peripheral surface and the outer end surface of the annular body and the corresponding inner wall of the volute, a second auxiliary channel is formed between the outer peripheral surface and the outer end surface of the annular enclosure and the corresponding inner wall of the volute, and a second auxiliary channel is formed between the inner peripheral wall 113 of the annular enclosure and the cover 24.

When the spiral case works, the rotor rotates at a high speed in a suspending way in the middle of the spiral case 200, the blades between the annular body 12 and the base body 11 and the inner wall of the spiral case 200 form a main flow channel of the pump, blood flows in from the medium inlet, enters the main flow channel between the blades through the central through hole of the annular body, enters the main flow channel in the spiral case after the rotation acceleration of the blades, and flows out of the spiral case through the medium outlet.

Meanwhile, a small portion of the blood entering the primary channel inside the volute 200 flows back to the inlet of the rotor body through the first auxiliary channel and the second auxiliary channel, and then enters between the vanes again, and flows into the volute after being accelerated. Through the design, all the flow passages which enter the centrifugal pump and flow through blood are in one-way flow, and no static or backflow area exists, so that the possibility of thrombus formation is reduced to the maximum extent.

Meanwhile, as the annular shell opposite to the end faces of the annular body and the seat body is made of ceramic materials, the surface of the annular shell is hard and smooth, and the possibility that the surface of the annular shell is damaged when the rotor is accidentally contacted with the annular shell is reduced. Because the motor efficiency is higher, under the same condition, the thickness of the first magnetic steel in the rotor can be thinner, and the thicknesses of the annular body 12 and the outer end wall (cover plate) of the base body 11 are correspondingly thinned, so that the length of a backflow flow channel in the volute is reduced.

Meanwhile, the outer end face of the annular body and the outer end face of the seat body respectively have preset included angles with the horizontal plane, the distance between the outer end face and the horizontal plane is increased from outside to inside, namely the outer end faces of the annular body and the seat body are inwards recessed, and the upper outer end face and the lower outer end face of the rotor are provided with inwards conical surfaces, so that the outer side gap of an auxiliary channel formed between the outer end face and the inner wall of the volute is smaller, and the inner side gap is larger.

The position sensor may be a hall sensor or an eddy current sensor, as long as the axial position of the rotor body can be detected.

It is right above that the utility model provides a magnetic suspension type centrifugal pump has introduced in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the scope of the appended claims.

Claims

1. A magnetic suspension type centrifugal pump is characterized by comprising a volute, a static magnetic ring and a rotor;

2. The magnetic levitation type centrifugal pump as claimed in claim 1, further comprising a position sensor for detecting an axial position of the rotor body;

3. The magnetically levitated centrifugal pump of claim 1, wherein the magnetic steel assembly and the magnetic member are disposed at first and second ends of the rotor body, respectively, and the drive coil assembly and the magnetic levitation coil assembly are disposed at first and second ends of the volute, respectively.

4. The magnetically levitated centrifugal pump of any one of claims 1 to 3, wherein the inner cavity of the volute has first and second annular housings therein at the first and second ends of the volute, respectively, the first and second annular housings enclosing a first sealed chamber enclosing the drive coil with the volute, the second annular housing enclosing a second sealed chamber enclosing the magnetically levitated coil assembly with the volute, the levitation chamber being formed between the first and second annular housings, the first and second annular housings being of ceramic construction, the drive coil assembly being disposed against the first annular housing, the magnetically levitated coil being disposed against the second annular housing.

5. The magnetic levitation type centrifugal pump as set forth in any one of claims 1 to 3, wherein the rotor body comprises an annular body and a seat body, which are fixedly arranged along an axial direction, and a liquid outlet is provided between the annular body and the seat body, a central through hole of the annular body is communicated with the liquid outlet, the central through hole is coaxial with the medium inlet, each of the blades is located between the annular body and the seat body, the magnetic steel assembly is encapsulated inside the annular body, and the moving magnetic ring and the magnetic member are encapsulated inside the seat body.

6. The magnetic suspension centrifugal pump according to claim 5, wherein the base body has an annular enclosure, the moving magnetic ring is sleeved on the inner annular wall of the annular enclosure, the magnetic member enclosed in the base body is located on the periphery of the moving magnetic ring, and the axial height of the middle area of the annular enclosure is greater than the axial height of the edge area in the radial direction.

7. The magnetic suspension type centrifugal pump according to claim 6, further comprising a base and a cover, wherein the cover has a cylindrical casing with an opening at one end and a guiding cone connected to the other end of the cylindrical casing, the opening of the cylindrical casing is circumferentially and hermetically engaged with the base, the static magnetic ring is fixed to the base by a screw member and is located inside the cylindrical casing, the base is in threaded and sealed connection with the volute and is coaxial with the medium inlet, and the guiding cone passes through the central hole of the annular packaging cavity and protrudes toward the medium inlet.

8. The magnetic levitation type centrifugal pump as claimed in claim 7, wherein a first auxiliary passage is formed between the outer circumferential surface and the outer end surface of the ring-shaped body and the corresponding inner wall of the volute, a second auxiliary passage is formed between the outer circumferential surface and the outer end surface of the ring-shaped enclosure and the corresponding inner wall of the volute, and between the inner circumferential wall of the ring-shaped enclosure and the cover body, and the outer end surface of the ring-shaped body and the outer end surface of the base body have a predetermined angle with respect to a horizontal plane, and the distance from the outer end surface to the horizontal plane increases from outside to inside.

9. The magnetic levitation type centrifugal pump as set forth in claim 5, wherein the ring body and the seat body are each provided at an outer end surface with a plurality of projections extending from an inner edge side to an outer edge side, and the projections have a predetermined angle with a radial direction, and a distance between adjacent projections is smaller as approaching the inner edge side or a height of the projections is lower as approaching the inner edge.

10. The magnetically levitated centrifugal pump of claim 1 or 2, wherein the rotor is of a centrifugal fully enclosed rotor structure, the blades are backward-curved blades, the magnetic steel assembly and the magnetic member are respectively disposed at a first end and a second end of the rotor body, and the blades are located between the magnetic steel assembly and the magnetic member;

or/and the magnetic part comprises a magnetic ring.