CN104373358A - Impeller and rolling bearing magnetic drive centrifugal pump based on Archimedes spiral - Google Patents

Abstract

The invention is a magnetic drive centrifugal pump based on Archimedes helical impeller and rolling bearing, which includes a motor, an active magnetic ring connected to the rotor of the motor, and a driven magnetic ring arranged in non-contact with the active magnetic ring and transmitting torque through magnetic force. There is an isolation sealing sleeve in the air gap between the active magnetic ring and the driven magnetic ring, the driven magnetic ring is fixedly connected with the impeller rotor, the impeller rotor is supported and limited by rolling bearings, the impeller rotor and the The outer ring of the rolling bearing is connected, the inner ring of the rolling bearing is locked on a support shaft, the support shaft is connected and fixed to the base of the pump casing, and the curve of the impeller surface of the impeller rotor is an Archimedes spiral. By adopting the technical solution of the invention, the torque is transmitted through the magnetic coupling, and the motor shaft and the rotor of the centrifugal pump have no mechanical contact. Avoid blood leakage and contamination, and the surface shape of the impeller is an Archimedes spiral, which can reduce damage to blood components.

Description

A Magnetic Drive Centrifugal Pump Based on Archimedes Helical Impeller and Rolling Bearing

technical field

The invention belongs to the field of medical ultra-precision pumps, and in particular relates to a magnetic drive centrifugal pump based on an Archimedes helical impeller and rolling bearings. the

Background technique

The application fields of medical centrifugal pumps mainly include extracorporeal circulation in cardiac surgery, ventricular assisted circulation, heart transplantation, extracorporeal membrane lung support, aortic surgery, liver and kidney transplantation, and extracorporeal circulation. In traditional centrifugal pumps, due to the friction at the seal of the rotor shaft, when the centrifugal pump is running at high speed, it will generate a lot of heat, which can easily lead to thrombus, and blood stagnation at the seal of the rotor shaft can easily lead to thrombus. In the impeller centrifugal pump, the shape design of the impeller is critical, and the quality of the impeller curve determines the degree of damage to the blood caused by the centrifugal pump. the

In the present invention, the torque is transmitted through the magnetic coupling, and the surface shape of the impeller is Archimedes spiral, which can reduce the damage to blood components, and the support shaft and rolling bearing are set to support and limit the impeller rotor, Solved the above problems. the

Contents of the invention

The purpose of the present invention is to overcome the problems existing in the prior art. The centrifugal pump adopted is a centrifugal pump driven by magnetic force, and the transmission between the rotor of the centrifugal pump and the motor shaft is realized through a magnetic coupling. The biggest feature of the magnetic coupling is that the driven magnetic rotor and the driven parts can be completely sealed through the isolation seal sleeve arranged in the air gap between the main and slave magnetic rotors, and the magnetic force can be used without mechanical contact. The movement and power of the active part are transmitted to the passive part. the

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the present invention is realized through the following technical solutions:

A magnetically driven centrifugal pump based on Archimedes helical impeller and rolling bearings, including a motor, an active magnetic ring connected to the rotor of the motor, and a driven magnetic ring arranged in non-contact with the active magnetic ring and transmitting torque through magnetic force. An isolation sealing sleeve is provided in the air gap between the active magnetic ring and the driven magnetic ring, the driven magnetic ring is fixedly connected with the impeller rotor, the impeller rotor is supported and limited by rolling bearings, and the impeller rotor and the outer ring of the rolling bearing The inner ring of the rolling bearing is locked on a support shaft, and the support shaft is connected and fixed to the base of the pump casing. The impeller curve of the impeller rotor is an Archimedes spiral.

Further, the driven magnetic ring and the driving magnetic ring are respectively interlaced with a plurality of permanent magnets. the

Further, the impeller rotor and the driven magnetic ring have an integrated structure. the

Further, the upper cover of the pump casing is sealed above the base of the pump casing, and the space between them is sealed by an O-ring. the

Further, the material of the pump casing base and the pump casing upper cover is polycarbonate with good biocompatibility.

Further, one end of the impeller rotor is connected to the base of the pump casing, and the rest of the impeller rotor is suspended in the chamber formed by the base of the pump casing and the upper cover of the pump casing. the

The beneficial effects of the present invention are:

The centrifugal pump does not mechanically squeeze the blood, so it has less damage to the formed components of the blood. Centrifugal pumps are suitable for large flow transmission, and the flow rate is generally 0-10L/min. The pressure provided by the centrifugal pump is 0-600mmHg. Centrifugal pumps are highly safe. There are a small amount of air bubbles in the blood transmission, which will be concentrated in the center and not be transmitted. Centrifugal pumps have the advantages of small size, light weight, low friction, and simple operation. The transmission between the rotor of the magnetic drive centrifugal pump and the motor shaft is realized by a magnetic coupling. The motor shaft has no mechanical contact with the centrifugal pump rotor. Avoid blood leakage and contamination, and solve the problem of difficult sealing of the centrifugal pump input shaft. The pump head can be replaced at one time, which is easy to replace and reduce costs. The surface shape of the impeller is Archimedes spiral, which can reduce the damage to blood components. .

Description of drawings

Fig. 1 is a schematic diagram of an internal sectional structure of the present invention;

Fig. 2 is a partially enlarged view of the rolling bearing structure in Fig. 1;

Fig. 3 is a schematic diagram of the Archimedes spiral impeller used in the present invention.

Explanation of symbols in the figure: 1. Lock nut, 2. Bearing, 3. Connecting shaft seat, 4. Active magnetic ring, 5. Mounting seat, 6. Pump casing base, 7. Driven magnetic ring, 8. O-ring , 9, pump casing cover, 10, screws, 11, impeller rotor, 12, screws, 13, nuts, 14, rolling bearings, 15, support shaft, 16, passive side base, 17, passive side cover. the

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. the

As shown in FIG. 1 , the motor drives the active magnetic ring 4 to rotate, and the active magnetic ring transmits the rotation to the driven magnetic ring 7 through magnetic force. The driven magnetic ring 7 is integrated with the impeller rotor 11, so that the motor drives the impeller rotor 11 to rotate. The impeller rotor 11, the driven magnetic ring 7, the pump casing cover 9 and the base 6 are made of polycarbonate material with good biocompatibility, and 10 permanent magnets are interlacedly embedded in the driven magnetic ring 7 and the active magnetic ring 4 . Due to the magnetic drive, the torque can be transmitted between the motor and the impeller rotor 11 without mechanical contact. The problem caused by the shaft seal of the impeller rotor 11 is avoided, and the structure of the pump casing base 6 is simplified. the

As shown in Fig. 1, only one end of the impeller rotor 11 (that is, the rotor of the centrifugal pump) is in contact with the casing, and the rest of the entire impeller rotor 11 is suspended in a static or moving state. Assuming that the impeller rotor 11 moves radially downward, the radial distance below the magnetic bearing decreases, and the magnetic density in the air gap increases, which increases the resistance of the magnetic ring at the lower part of the magnetic bearing and pushes the impeller rotor 11 back to the center. This is also the case for the movement of the impeller rotor 11 in other radial directions. Therefore, the impeller rotor 11 is radially stable. Since the active magnetic ring 4 and the driven magnetic ring 7 are attracted to each other, the impeller rotor 11 will be attracted by the active magnetic ring 4 and pressed against the base 6 of the pump casing, so the axial direction is also stable. the

As shown in Figure 2, the impeller rotor 11 is supported and limited by the rolling bearing 14, the inner ring of the rolling bearing 14 is locked on the support shaft 15, and is connected and fixed with the pump casing base 6; the outer ring of the rolling bearing 14 is connected with the impeller rotor 11 and the driven magnet The rings 7 are coupled and rotate simultaneously. the

As shown in FIG. 3 , the impeller designed based on the Archimedes helix used in the present invention has a curved surface shape that can reduce damage to blood costs. the

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. the

Claims (6)

1. one kind is driven centrifugal pump based on the magnetic of spiral of Archimedes impeller and rolling bearing, it is characterized in that, comprise motor, the active magnet ring (4) be connected with rotor, and to arrange with active magnet ring (4) non-contact and to pass through the driven magnet ring (7) of magnetic drives moment of torsion, isolating seal cover is provided with in described active magnet ring (4) and driven magnet ring (7) intermediate air gap, described driven magnet ring (7) and vane rotor (11) are fixed together, described vane rotor (11) by rolling bearing (14) support and spacing, vane rotor (11) connects with rolling bearing (14) outer ring, described rolling bearing (14) inner ring is locked on a back shaft (15), back shaft (15) and pump case base (6) are connected and fixed, the impeller Curve On The Surface of described vane rotor (11) is spiral of Archimedes.

2. the magnetic based on spiral of Archimedes impeller and rolling bearing according to claim 1 drives centrifugal pump, it is characterized in that, described driven magnet ring (7) and initiatively magnet ring (4) interlock respectively is inlaid with polylith permanent magnet.

3. the magnetic based on spiral of Archimedes impeller and rolling bearing according to claim 1 drives centrifugal pump, it is characterized in that, described vane rotor (11) and driven magnet ring (7) are integral type structure.

4. the magnetic based on spiral of Archimedes impeller and rolling bearing according to claim 1 drives centrifugal pump, it is characterized in that, described pump case base (6) top is sealed with pump case upper cover (9), and between by O type circle (8) sealing.

5. the magnetic based on spiral of Archimedes impeller and rolling bearing according to claim 3 drives centrifugal pump, it is characterized in that, the material of described pump case base (6) and pump case upper cover (9) adopts the polycarbonate (PC) with better biocompatibility.

6. the magnetic based on spiral of Archimedes impeller and rolling bearing according to claim 1 or 4 drives centrifugal pump, it is characterized in that, one end of described vane rotor (11) and pump case base (6), the unsettled setting in the chamber that pump case base (6) and pump case upper cover (9) are formed of vane rotor (11) remaining part.