CN217240545U - A Magnetically Suspended Ventricular Auxiliary Pump Motor with High Magnetic Field Utilization - Google Patents

Abstract

The utility model discloses a magnetic suspension ventricle auxiliary pump motor of high magnetic field utilization ratio, including stator and rotor core. The stator comprises an inner stator and an outer stator, and the inner stator is connected with the outer stator through threads. The inner stator is provided with an inner iron core hole, the outer stator is provided with an outer iron core hole, and the inner iron core and the outer iron core are in clearance fit with the iron core hole. The inner stator with be provided with between the outer stator rotor core, rotor core includes "L" type coupling iron ring, magnetic force coupling magnet and interior annular magnet, interior annular magnet with outer annular magnet that sets up on the outer stator has formed concentric a pair of annular magnet structure. End pole pieces are arranged around the magnetic coupling magnet, the inner annular magnet and the outer annular magnet. The utility model discloses adopted the compact structure of high magnetic field utilization ratio in the design, can reduce the heat that produces when the pump motor normally functions, realize low heat production, low energy consumption, possess more excellent blood compatibility as a ventricular assist pump.

Description

A Magnetically Suspended Ventricular Auxiliary Pump Motor with High Magnetic Field Utilization

technical field

The utility model belongs to the technical field of magnetic levitation motors, and relates to a magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization rate.

Background technique

Heart failure is the biggest challenge in the field of cardiovascular disease in the future. Magnetic levitation ventricular assist devices in the short and medium term can be used for blood circulation support in critically ill patients with acute and chronic heart failure, providing the blood flow needed for patient survival and maintaining arterial pressure. The systemic blood supply of the patient is completed by the short-term and mid-term ventricular assist pump, and the patient's heart is almost static during the short-term and mid-term assist pump support, so that the patient's heart can rest and recover during the assist pump support period. After cardiac surgery, the use of short-term and mid-term ventricular assist pumps can accelerate the recovery of the patient's heart and strengthen the heart.

At present, there is no mature domestic manufacturer to produce short-term and medium-term magnetic levitation left ventricular auxiliary pumps. In foreign countries, Centrimag is the representative of short-term and medium-term magnetic levitation ventricular auxiliary pumps. There are problems such as insufficient blood compatibility of the pump and large heat generation of the pump motor.

After several technical innovations, the performance of the ventricular assist pump is developing towards a more excellent and stable direction, but problems such as hemolysis and thrombosis still exist. The occurrence of hemolysis and thrombosis is mainly caused by the following two factors: First, it is related to the shear force and exposure time of the blood in the pump. Red blood cells are exposed to high shear stress for a long time. The cumulative effect of fragility will increase the risk of hemolysis caused by the fragmentation of red blood cells; second, it is related to the heat generation of the pump motor. Excessive heat generation of the pump motor will also increase the probability of thrombosis, thereby causing hemolysis, and the pump motor structure is not compact or The low magnetic field utilization rate caused by the poor magnetic field distribution will make the pump motor generate too much heat.

The former can be improved by magnetic levitation technology, which differs from mechanical or hydrodynamic levitation in the use of magnetic force, which itself is non-contact, eliminating the need for fluid as a medium to levitate the pump impeller, allowing blood in the gap Subject to less shear stress, which helps improve blood compatibility, another advantage of magnetic levitation is that there is no physical contact between parts, which eliminates any mechanical wear on the parts of the levitation system. The latter can be solved by designing a compact pump-motor structure with high magnetic field utilization.

The purpose of this utility model is to provide a magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization, which can solve the above-mentioned deficiencies of the existing magnetic levitation ventricular auxiliary pump motor to a certain extent, for example: the existing magnetic levitation ventricular auxiliary pump motor does not have Make full use of the magnetic field, there is a large magnetic loss during operation, the current is too large to generate a large amount of heat, the structure is not simple and compact, so the power consumption is large, the efficiency is low, the blood compatibility of the pump is insufficient, and it is easy to cause hemolysis and thrombosis. To this end, it is necessary to design new technical solutions to solve it.

Utility model content

The purpose of the present utility model is to provide a magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization rate, so as to solve the problem that the magnetic field utilization rate of the existing magnetic levitation ventricular auxiliary pump mentioned in the above-mentioned background technology is not high, and the pump motor generates heat during operation. Larger, poorer blood compatibility issues.

In order to achieve the above purpose, the present invention provides the following technical solutions: a magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization, including a stator and a rotor iron core, the stator includes an inner stator and an outer stator, and the inner stator is provided with a 6 inner iron core holes evenly distributed in the circumferential direction, the outer stator is provided with 3 outer iron core holes evenly distributed in the circumferential direction, and clearance fit is adopted between the inner and outer iron cores and the iron core holes. The rotor iron core is arranged between the inner stator and the outer stator, and the rotor iron core includes an "L"-shaped coupling iron ring, a magnetic coupling magnet and an inner ring magnet, and the inner ring magnet is connected to the outer stator. The arranged outer ring magnets form a concentric pair of ring magnet structures.

Preferably, the positioning magnetic field formed by the outer stator and the outer iron core acts on the "L"-shaped coupling iron ring on the rotor iron core, and the rotating magnetic field formed by the inner stator and the inner iron core The magnetic coupling magnet acting on the rotor iron core acts independently of the positioning magnetic field and the rotating magnetic field, and there is no mutual influence between the two magnetic fields.

Preferably, the pole pieces are arranged around the magnetic coupling magnet, the outer ring magnet and the inner ring magnet, which can effectively reduce magnetic loss. The iron core, the outer iron core, the "L"-shaped coupling iron ring and the terminal pole piece are all made of permalloy material, which has low magnetic loss and high magnetic permeability, which can effectively improve the performance of the motor.

Preferably, the outer ring magnet and the inner ring magnet form a concentric pair of ring magnet structures, the axial positioning of the rotor core is achieved by passive magnetic suspension, and the radial positioning is achieved by active magnetic suspension. Under the synergistic effect of the magnetic suspension and the passive magnetic suspension, the stable suspension and rotation of the rotor core are ensured.

Preferably, the inner stator and the outer stator are connected by threads, and the center of the inner iron core and the outer iron core are ensured to have the same height by means of a stepped shaft.

The utility model provides a magnetic suspension ventricular auxiliary pump motor with high magnetic field utilization, which has the following beneficial effects:

By shortening the distance of the magnetic field, the utility model reduces the radial gap between the inner iron core and the magnetic coupling magnet and the radial gap between the outer iron core and the "L"-shaped coupling iron ring gap, effectively increasing the utilization of the magnetic field.

The utility model improves the magnetic field distribution by placing end pole pieces around all the permanent magnets, thereby reducing the magnetic loss and enabling the pump motor to achieve lower heat production and lower energy consumption under the same conditions.

The utility model reduces the mutual influence of the two magnetic fields and increases the utilization rate of the magnetic fields to a certain extent by adopting the independent action of the positioning magnetic field and the rotating magnetic field.

Description of drawings

Fig. 1 is the general structure diagram of the magnetic levitation ventricular auxiliary pump motor of a kind of high magnetic field utilization rate of the present utility model;

2 is an isometric view of the internal structure of a magnetic levitation ventricular auxiliary pump motor with a high magnetic field utilization rate of the present invention;

3 is a front view of the inner stator of a magnetically suspended ventricular auxiliary pump motor with a high magnetic field utilization rate of the present invention;

4 is an isometric 120° cross-sectional view of the outer stator of a magnetically suspended ventricular auxiliary pump motor with high magnetic field utilization of the present invention;

5 is a magnetic field simulation diagram of a concentric annular magnet structure of a magnetically suspended ventricular auxiliary pump motor with high magnetic field utilization rate of the present invention;

Fig. 6 is a magnetic field simulation diagram after the concentric annular magnet structure of a magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization rate of the present invention is provided with end pole pieces;

7 is a simulation diagram of a rotating magnetic field of a magnetically suspended ventricular auxiliary pump motor with a high magnetic field utilization rate of the present invention;

8 is a simulation diagram of the positioning magnetic field of a magnetic suspension ventricular auxiliary pump motor with a high magnetic field utilization rate of the present invention;

FIG. 9 is an exploded view of a magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization rate according to the present invention.

In the figure: stator 1, rotor core 2, inner stator 3, outer stator 4, thread 5, inner core hole 6, outer core hole 7, inner core 8, outer core 9, "L" type coupling iron Ring 10 , magnetic coupling magnet 11 , inner ring magnet 12 , outer ring magnet 13 , pole piece 14 .

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example.

The suspension of the rotor core is completed by the coordinated control of the active magnetic suspension and the passive magnetic suspension to realize its axial and radial positioning. The axial positioning is specifically realized by the concentric pair of ring magnets formed by the outer ring magnet and the inner ring magnet; The positioning of the rotor core in the radial direction is controlled by the positioning magnetic field acting on the "L" type coupling iron ring. The rotation of the rotor iron core is realized by active magnetic suspension, and the rotating magnetic field exerts a force on the magnetic coupling magnet on the rotor iron core, so that the rotor iron core starts to rotate.

A magnetic levitation chamber-assisted pump motor with high magnetic field utilization, comprising a stator (1) and a rotor iron core (2), the stator (1) comprising an inner stator (3) and an outer stator (4), the inner stator ( 3) is connected with the outer stator (4) through threads (5); the inner stator (3) is provided with 6 inner iron core holes (6) uniformly distributed in the circumferential direction, and the outer stator (4) There are three outer iron core holes (7) evenly distributed in the circumferential direction, and the inner and outer iron cores (8-9) respectively adopt clearance fit with the iron core holes (6-7); the inner stator (3) The rotor iron core (2) is arranged between the outer stator (4) and the rotor iron core (2) includes an "L"-shaped coupling iron ring (10), a magnetic coupling magnet (11) and an inner ring A magnet (12), the inner ring magnet (12) and the outer ring magnet (13) provided on the outer stator (4) form a concentric pair of ring magnet structures; the magnetic coupling magnet (11), the End pole pieces (14) are arranged around the inner ring magnet (12) and the outer ring magnet (13), and the end pole pieces (14) can improve the magnetic field distribution by guiding the direction of the magnetic field; The radial gap between the iron core (8) and the magnetic coupling magnet (11) and the radial gap between the outer iron core (9) and the "L"-shaped coupling iron ring (10) are very large. It is characterized by: compact structure with high magnetic field utilization, low heat generation, low power consumption, and excellent blood compatibility as a ventricular auxiliary pump.

As shown in Figure 1, a magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization, 6 inner iron cores (8) and inner iron core holes (6) on the inner stator (3) adopt clearance fit, and 3 outer iron cores The core (9) adopts clearance fit with the outer iron core hole (7) on the outer stator (4).

Figure 2 shows the overall structure of the pump motor. It can be seen that the pump motor structure includes a stator (1) and a rotor core (2), and the stator (1) includes an inner stator (3) and an outer stator (4) , the inner stator (3) is connected with the outer stator (4) through threads (5); the inner stator (3) is provided with the rotor iron core (2), the rotor iron core (2) It comprises an "L"-shaped coupling iron ring (10), a magnetic coupling magnet (11) and an inner ring magnet (12); the magnetic coupling magnet (11) is provided with a pole piece (14); the outer stator (4) ) is provided with an outer ring magnet (13), which forms a concentric pair of ring magnet structures with the inner ring magnet (12), the inner ring magnet (12) and the outer ring magnet (13) are provided with surrounding The end pole piece (14) can improve the magnetic field distribution by guiding the direction of the magnetic field.

Figure 3 shows the structure of the inner stator (3) of the pump motor. The inner stator (3) is provided with 6 inner iron core holes (6) uniformly distributed in the circumferential direction.

Figure 4 shows the structure of the outer stator (4) of the pump motor. The outer stator (4) is provided with three outer iron core holes (7) uniformly distributed in the circumferential direction.

Figure 5 shows the magnetic circuit of the concentric ring magnet structure when no pole pieces are provided. The spatial distribution of the magnetic field is relatively scattered, and the loss of the peripheral magnetic field is relatively large.

Figure 6 shows the magnetic circuit when the pole pieces are arranged around the concentric ring magnet structure. Compared with Figure 5, the magnetic field distribution has been improved to a certain extent. Magnetic field loss in space.

Figure 7 shows the distribution of the magnetic circuit of the inner rotating magnetic field, which can realize the rotation of the rotor core (2). The inner iron core (8) is energized in a clockwise direction to form a rotating magnetic field, and the magnetic field acts on the magnetic coupling magnet (11) on the rotor iron core (2) to generate force, and the torque acts on the rotor The iron core (2) starts to rotate.

Figure 8 shows the magnetic circuit distribution of the external positioning magnetic field. The magnetic field and the concentric annular magnet magnetic field shown in Figure 6 work together to ensure the suspension of the rotor core (2), so that the rotor core (2) can be placed on the shaft. The axial positioning of the rotor iron core (2) is realized by passive magnetic suspension, specifically through the concentric pair of ring magnet structures formed by the outer ring magnet (13) and the inner ring magnet (12). Therefore, when the rotor core (2) is displaced in the axial direction, that is, when the centers of the inner ring magnet (12) and the outer ring magnet (13) are not at the same height, the magnetic field of the concentric ring magnets will generate corresponding The magnetic force acts on the rotor iron core (2) to make it return to a stable state and achieve its axial positioning; and when the rotor iron core (2) is displaced in the radial direction, the outer iron core (9) The external positioning magnetic field can be formed by getting electricity, and the magnetic field force acts on the "L"-shaped coupling iron ring (10) on the rotor iron core (2), so that the rotor iron core (2) returns to a stable state, achieve radial positioning.

The inner stator (3), the outer stator (4), the inner iron core (8), the outer iron core (9), the "L" type coupling iron ring (10) and the end The pole pieces (14) are all made of permalloy material, which has low magnetic loss and high magnetic permeability, and can effectively improve the performance of the motor.

It should be noted that, for a magnetically suspended ventricular auxiliary pump motor with high magnetic field utilization, the radial gap between the inner iron core (8) and the magnetic coupling magnet (11) and the outer iron core (9) The radial gap between the "L" type coupling iron ring (10) is very small, only 1.5 mm. The magnetic coupling magnet (11), the outer ring magnet (13) and the inner ring The end pole pieces (14) are arranged around the magnet (12). This compact structure with high magnetic field utilization effectively reduces heat generation, truly realizes low heat generation and low power consumption, and makes the blood of the blood pump more compatible. Better capacitance, higher pump motor efficiency and more advantages.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them. Although the present utility model has been described in detail with reference to the above embodiments, for those of ordinary skill in the art , it is still possible to modify the technical solutions recorded in the above-mentioned embodiments, or to perform equivalent replacements to some or all of the technical features, and these modifications or replacements should fall within the scope of protection of the appended claims of the present utility model. .

Claims (6)

1. A magnetic levitation chamber-assisted pump motor with high magnetic field utilization, comprising a stator (1) and a rotor core (2), the stator (1) comprising an inner stator (3) and an outer stator (4), the inner stator The stator (3) is connected with the outer stator (4) through threads (5); the inner stator (3) is provided with 6 inner iron core holes (6) uniformly distributed in the circumferential direction, and the outer stator ( 4) There are three outer iron core holes (7) evenly distributed in the circumferential direction, and the inner and outer iron cores (8-9) are respectively matched with the iron core holes (6-7) by clearance fit; the inner stator ( 3) The rotor iron core (2) is arranged between the outer stator (4), and the rotor iron core (2) includes an "L"-shaped coupling iron ring (10), a magnetic coupling magnet (11) and An inner ring magnet (12); characterized in that: the inner ring magnet (12) and the outer ring magnet (13) provided on the outer stator (4) form a concentric pair of ring magnet structures, and the magnetic force End pole pieces (14) are arranged around the coupling magnet (11), the inner ring magnet (12) and the outer ring magnet (13). 2 . The magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization rate according to claim 1 , wherein the rotating magnetic field formed by the inner stator ( 3 ) and the inner iron core ( 8 ) makes the rotor The iron core (2) starts to rotate, and the positioning magnetic field formed by the outer stator (4) and the outer iron core (9) realizes the radial positioning of the rotor iron core (2), and the rotor iron core (2) The stable levitation rotation is guaranteed by the independent action of the positioning magnetic field and the rotating magnetic field. 3. The magnetically suspended ventricular auxiliary pump motor with high magnetic field utilization rate according to claim 1, characterized in that: the radial gap between the inner iron core (8) and the magnetic coupling magnet (11) and The radial gap between the outer iron core (9) and the "L"-shaped coupling iron ring (10) is small. 4. The magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization rate according to claim 1, characterized in that: the axial positioning of the rotor core (2) is achieved by passive magnetic levitation, and its radial positioning is Realized by active magnetic levitation, precise pose control during suspension and rotation of the rotor iron core (2) is realized under the synergistic effect of active magnetic levitation and passive magnetic levitation. The magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization rate according to claim 1, characterized in that: the inner stator (3) and the outer stator (4) ensure the inner stator (3) and the outer stator (4) by means of stepped shafts. The iron core (8) has the same height as the center of the installation position of the outer iron core (9). 6. The magnetic levitation ventricular auxiliary pump motor with high magnetic field utilization rate according to claim 1, characterized in that: the six inner iron core holes (6) on the inner stator (3) are arranged in a circumferential direction. Evenly distributed, the three outer iron core holes (7) on the outer stator (4) are also uniformly distributed in the circumferential direction.

Images