阅读说明：本技术 一种具有中心磁极结构的体外磁悬浮离心血泵 (External magnetic suspension centrifugal blood pump with central magnetic pole structure ) 是由 胡盛寿 柳光茂 张岩 陈海波 于 2019-09-25 设计创作，主要内容包括：本发明提供一种具有中心磁极结构的体外磁悬浮离心血泵,其中泵头包括叶轮和泵壳,泵壳下部的柱形腔室的下底板内凹成一中心柱壳,对应泵壳外的下底板成一中心管腔；叶轮中的叶片固设于底座上,底座为一个圆筒形壳体,其内设一管段,永磁体固在管段和壳体间的环形腔室中；叶轮套设在中心柱壳上；叶轮底座和泵壳的柱形腔室间及管段和中心柱壳间有一段W形的二次流道；磁悬浮装置在泵壳的下面,其中的磁悬浮元件中的定子软铁包括一中心柱状软铁,泵壳的中心管腔插在中心柱状软铁上成中心磁极。本离心血泵可减少血栓和溶血,提高泵的稳定性和运行效率。(The invention provides an in vitro magnetic suspension centrifugal blood pump with a central magnetic pole structure, wherein a pump head comprises an impeller and a pump shell, a lower bottom plate of a cylindrical cavity at the lower part of the pump shell is recessed into a central cylindrical shell, and a central tube cavity is formed by the lower bottom plate corresponding to the outside of the pump shell; the blades in the impeller are fixedly arranged on a base, the base is a cylindrical shell, a pipe section is arranged in the cylindrical shell, and the permanent magnet is fixedly arranged in an annular cavity between the pipe section and the shell; the impeller is sleeved on the central column shell; a section of W-shaped secondary flow channel is arranged between the impeller base and the cylindrical cavity of the pump shell and between the pipe section and the central cylindrical shell; the magnetic suspension device is arranged below the pump shell, the stator soft iron in the magnetic suspension element comprises a central cylindrical soft iron, and a central tube cavity of the pump shell is inserted into the central cylindrical soft iron to form a central magnetic pole. The centrifugal blood pump can reduce thrombus and hemolysis and improve the stability and the operating efficiency of the pump.)

1. The utility model provides an external magnetic suspension centrifugal blood pump with central magnetic pole structure which characterized in that: comprises a pump head and a magnetic suspension device,

The pump head comprises a magnetic suspension rotor impeller and a pump shell, the magnetic suspension rotor impeller is positioned in the pump shell, a gap is formed between the magnetic suspension rotor impeller and the pump shell,

The pump shell comprises a volute, a central hole is formed in the upper top surface of the volute along the central axis, a central inlet pipe is fixedly connected to the central hole, a tangential outlet pipe is arranged at the outer edge of the volute, a cylindrical chamber communicated with the volute is arranged at the lower part of the volute, the lower bottom plate of the cylindrical chamber is recessed inwards on the central axis, a central cylindrical shell is formed by protruding in the cylindrical chamber, and correspondingly, a central pipe cavity is formed by the lower bottom plate outside the pump shell;

The magnetic suspension rotor impeller comprises blades, permanent magnets and a base, wherein the blades are fixedly arranged on the upper surface of the base, the base is a cylindrical shell, the upper bottom surface of the base is closed, a central through hole is formed in the upper surface of the base, a pipe section is arranged on the central through hole in an extending mode towards the interior of the cylindrical shell, the cylindrical shell of the base is formed into an annular chamber through the pipe section, and the permanent magnets are fixedly arranged in the annular chamber; a plurality of blades are uniformly and fixedly arranged on the upper surface of the base around the central through hole,

The impeller is sleeved on the central column shell in the pump shell, so that the magnetic suspension rotor impeller is suspended under the action of magnetic suspension force and is matched with the magnetic suspension device to form a magnetic bearing; gaps are arranged between the base of the magnetic suspension rotor impeller and the cylindrical cavity of the pump shell and between the pipe section and the central cylindrical shell, so that a section of W-shaped secondary flow channel is formed in the pump shell;

The magnetic suspension device is arranged below the pump shell and comprises a body which is a cylinder with a closed lower bottom, wherein a magnetic suspension element is arranged, the magnetic suspension element comprises stator soft iron and an electromagnetic coil, the stator soft iron is arranged in the cylinder, the stator soft iron is arranged on the inner wall of the body, the lower bottom plate of the cylinder is provided with a central column-shaped soft iron, is connected with stator soft iron arranged on the inner wall of the body into a whole, the cylindrical cavity of the pump shell is inserted in the middle of the stator soft iron in the cylinder on the body, the central columnar soft iron is inserted into the central tube cavity on the lower bottom plate of the pump shell, an electromagnetic coil is arranged on a stator arranged on the inner wall in the body, the central columnar soft iron forms a central magnetic pole, the magnetic suspension element and the permanent magnet in the magnetic suspension rotor impeller correspondingly form a motor and also form a magnetic element for adjusting the position of the magnetic suspension rotor impeller in the pump shell; the central magnetic pole structure enables the magnetic circuit of each stator magnetic pole to be closed;

The magnetic suspension device also comprises a control device, the control device comprises an impeller positioning control device and an impeller rotation control device,

In the impeller positioning control device, corresponding electromagnetic coils are connected with the impeller positioning control device so as to adjust the current of the electromagnetic coils and adjust the position of the magnetic suspension rotor impeller in the pump shell;

The impeller rotation control device enables the impeller to rotate and the rotating speed to be adjusted through the action of the current change of the corresponding electromagnetic coil and the permanent magnet in the impeller.

2. The extracorporeal magnetic levitation centrifugal blood pump with a central magnetic pole structure as claimed in claim 1, wherein: the magnetic suspension rotor impeller comprises four pairs of eight streamline blades, and the blade structure is alternatively designed as follows:

One is as follows: the eight blades are the same and are uniformly fixed on the upper surface of the base in the circumferential direction;

The second is that: two pairs of the eight blades are longer, the other two pairs of the eight blades are shorter, four longer blades and four shorter blades are uniformly fixed on the upper surface of the base at intervals, and the outer end edges of the eight blades are on a circumferential track; and/or the presence of a gas in the gas,

when the magnetic suspension rotor impeller works normally, the magnetic suspension rotor impeller is positioned at a set position, and at the moment, the gap between the base of the magnetic suspension rotor impeller and the cylindrical chamber of the pump shell and the gap between the pipe section of the magnetic suspension rotor impeller and the central cylindrical shell are 1.0mm-1.5 mm.

3. the extracorporeal magnetic levitation centrifugal blood pump with a central magnetic pole structure as claimed in claim 2, wherein: the curve of the blade has the following characteristics: fitting with smooth transition spline curve to obtain pump with impeller rotation speed of 1500-6000 rpm, flow rate of 1-10L/min, and pressure rise of 60-600 mmHg; and/or the presence of a gas in the gas,

The difference between the distance R1 from the inner end edge of the longer vane to the center of rotation of the magnetically levitated rotor wheel and the distance R2 from the inner end edge of the shorter vane to the center of rotation of the magnetically levitated rotor wheel is within a range of values: 2.0mm-5.0 mm.

4. the extracorporeal magnetic levitation centrifugal blood pump with a central magnetic pole structure as claimed in claim 1, wherein: the impeller positioning control device comprises a position sensor, a controller and a power amplifier, wherein the position sensor is arranged on the outer circumferential direction of the magnetic suspension rotor impeller and used for monitoring the radial displacement, the radial rotation and the axial displacement of the magnetic suspension rotor impeller.

5. The in vitro magnetic levitation centrifugal blood pump with a central magnetic pole structure as claimed in claim 4, wherein: the position sensor is connected with the controller to feed back the position of the magnetic suspension rotor impeller in real time, and the impeller positioning control device enables: when the magnetic suspension rotor impeller deviates from a set position or a central position in the pump shell, the control device performs operation according to the position of the magnetic suspension rotor impeller and a set algorithm, an operation result drives the power amplifier, current is generated in the magnetic suspension control electromagnetic coil of the impeller positioning control device, force for returning the magnetic suspension rotor impeller to the central position is provided, and finally the magnetic suspension rotor impeller is stably suspended under the disturbance of external force.

6. The extracorporeal magnetic levitation centrifugal blood pump with a central magnetic pole structure as claimed in claim 5, wherein: the algorithm is a PID.

7. the extracorporeal magnetic levitation centrifugal blood pump with a central magnetic pole structure as claimed in claim 1 or 4, wherein: the impeller positioning control device controls the magnetic suspension bearing to comprise an active magnetic suspension control system and a passive magnetic suspension control system, and realizes five-degree-of-freedom suspension control of the magnetic suspension rotor impeller in blood:

a first degree of freedom: the translational degree of freedom along the axial direction is controlled by passive magnetic suspension;

Second and third degrees of freedom: two translational degrees of freedom along the radial direction are actively controlled by an active magnetic suspension control system;

Fourth and fifth degrees of freedom: when two rotation degrees of freedom along the radial direction, namely the impeller of the magnetic suspension rotor, are inclined, the active magnetic suspension control system actively controls the two rotation degrees of freedom; and/or the presence of a gas in the gas,

The rotation along the axial direction is actively controlled by an impeller rotation control device or a motor, namely a permanent magnet in a magnetic suspension rotor impeller and a corresponding electromagnetic device.

8. the in vitro magnetic levitation centrifugal blood pump with a central magnetic pole structure as claimed in claim 4, wherein: the controller completes high-speed digital signal processing required by impeller positioning control and impeller rotation control through the processing of the ARM processor.

9. the extracorporeal magnetic levitation centrifugal blood pump with a central magnetic pole structure as claimed in claim 1 or 4, wherein: the permanent magnets in the magnetic suspension rotor impeller are provided with magnetic poles which are in dual connection with the stator soft iron.

10. The in vitro magnetic levitation centrifugal blood pump with a central magnetic pole structure as claimed in claim 4, wherein: the controller and the power amplifier in the control device, namely the magnetic suspension control device, are connected with the electromagnetic coil in the magnetic suspension device, so that: when the magnetic suspension rotor impeller deviates from a set position or the central position in a pump shell, the sensor sends a signal to the controller, the controller controls the current in the electromagnet through the power amplifier after processing, the magnetic suspension control device carries out operation according to the position of the magnetic suspension rotor impeller and an algorithm, an operation result drives the power amplifier, the current is generated in a magnetic suspension control coil, namely the electromagnetic coil, so that the change of the electromagnetic force is generated, the force for returning the magnetic suspension rotor impeller to the central position is provided, and finally the magnetic suspension rotor impeller is stably suspended at the specified position under the disturbance of an external force.