CN201934324U - Permanent magnetic levitation axial electric pump - Google Patents

Abstract

A permanent magnetic levitation axial electric pump belongs to the field of pump technology, including a permanent magnetic bearing, an axial motor and a pump, the pump and the axial motor are installed and connected as a whole, a mechanical seal device is provided between the axial motor and the pump, and the permanent magnetic bearing There are static magnetic rings and moving magnetic rings, the static magnetic rings and moving magnetic rings are offset, the moving magnetic rings are installed on the rotor shaft, and the static magnetic rings are installed on the casing of the axial motor group. The axial motor group includes the stator and the rotor. Shaft, rotor disk, end cover, the rotor disk is installed in the middle of the rotor shaft, shallow grooves are uniformly processed on both sides of the rotor disk, and stators are installed symmetrically on both sides of the rotor disk, and six cross-sections are evenly distributed on the stator. Sector-shaped salient poles, coil windings are wound on the salient poles, roller thrust bearings are arranged at both ends of the rotor shaft, and the roller thrust bearings are respectively clamped on the end covers at both ends. The utility model has reasonable, compact and simple structure, easy manufacture, good sealing performance, eliminates torque loss, improves motor power and pump efficiency, and is convenient for control and adjustment.

Description

Permanent Magnetic Magnetic Suspension Axial Electric Pump

technical field

The utility model relates to a pump, in particular to the structure of a magnetic levitation electric pump in which the output shaft of the motor and the input shaft of the pump are the same shaft, and belongs to the technical field of pumps.

Background technique

There are many structural forms of pumps, which are widely used in many fields such as industry and agriculture. Generally, the connection between the motor as the power source and the pump needs to be connected by coupling, gear transmission or belt transmission. Due to the manufacturing, installation or deformation of various components, it is impossible to ensure that the motor shaft and the pump shaft are completely coaxial, and wear and vibration will occur during high-speed rotation, resulting in low efficiency of the system, unstable operation, and noise. Big and other issues. In order to avoid these problems, an integrated electric pump consisting of a motor and a pump has appeared. The electric pump has the advantages of compact structure, reduced volume, reduced weight and low noise, and avoids friction loss, vibration and noise caused by different shafts, and improves work efficiency. However, the existing electric pumps cannot completely eliminate the phenomena of power loss, component wear and heat generated by friction, and it is difficult to achieve high-speed operation.

Utility model content

The purpose of this utility model is to propose a new type of magnetic levitation electric pump based on the magnetic levitation technology and motor technology, under the support of the National Natural Science Foundation of China (No. 50975249). In addition to the advantages of ordinary electric pumps, the magnetic levitation electric pump can also eliminate the friction and wear of the supporting rotor, without lubrication, pollution-free, long service life, and can increase the speed and output power of the pump. It has a simple and compact structure and low power consumption. , high efficiency, low noise, energy saving, easy control and high reliability, and has broad application prospects.

The purpose of this utility model is achieved through the following technical solutions. The permanent magnet magnetic levitation axial electric pump includes a permanent magnetic bearing, an axial motor and a pump. The pump and the axial motor are installed and connected as a whole. There is a mechanical sealing device between them. The permanent magnet bearing is provided with a static magnetic ring and a moving magnetic ring. The static magnetic ring and the moving magnetic ring are offset. The moving magnetic ring is installed on the rotor shaft. On the casing of the motor unit; the axial motor includes a stator, a rotor shaft, a rotor disc, and an end cover. The rotor disc is installed in the middle of the rotor shaft. Shallow grooves are uniformly processed on both sides of the rotor disc. The stator is arranged and installed symmetrically on the side. Six salient poles with fan-shaped cross-section are evenly distributed on the stator. Coil windings are wound on the salient poles. Roller thrust bearings are installed at both ends of the rotor shaft, and the roller thrust bearings are respectively stuck on the end covers at both ends. superior.

The pump includes a pump body, an impeller, a lining cover and a pump cover. The pump body is a split spiral shape. The impeller is installed and connected to the end of the rotor shaft through a key. The center of the pump cover is provided with a water inlet. The water port, the pump body and the casing of the axial motor are connected by bolts, the lower part of the pump body is provided with a water channel formed by grooves and through holes, and the impeller is a centrifugal impeller.

The mechanical seal device is composed of a small disc, a baffle, and a sleeve. The small disc is pressed onto the rotor shaft by the impeller through the sleeve. The baffle is arranged between the small disc and the roller thrust bearing. The small disc The side of the disc facing the sleeve is concave, and a small gap is provided between the small disc and the pump body to communicate with the water channel at the lower part of the pump body.

One end of the moving magnetic ring is provided with a nut for adjusting the relative offset position of the moving magnetic ring and the static magnetic ring.

A gasket is provided between the static magnetic ring and the shell.

The stator and the shell are integrally structured.

The utility model has the advantages of reasonable, compact and simple structure, easy manufacture, good performance, low power consumption, high efficiency, low noise and energy saving. Two pairs of offset permanent magnet bearings are used as the basis for the axial and radial balance of the motor rotor, and the disc axial motor is designed as the power source of the pump. Compared with the radial motor, the stator coil of the axial motor is in the electromagnetic induction. Under the action, it not only generates torque on the rotor, but also generates an axial force on it. Due to the use of two stators, a pair of axial forces in opposite directions are generated on both sides of the rotor disc, so that the motor shaft is axially The rotation direction can be more stable, and the working stability of the pump will not be affected by the axial movement of the rotor shaft. At the same time, a disc-type mechanical seal is designed as the sealing device of the electric pump. A small disc with a groove on one side is used in the seal. Driven by the high-speed rotation, the incoming water touches the concave surface of the small disc, and will be thrown to the wall of the pump body under the action of centrifugal force, then flow into the water channel formed by the pump body and the end cover, and flow back to the water inlet through the water channel. A baffle is installed between the small disc and the bearing, which can prevent water from entering the motor and corroding the bearing, which not only ensures the safety of the motor, but also ensures the complete suspension of the rotor. The sealing device has simple and compact structure, small volume, light weight and convenient processing and manufacturing.

The radial support bearing of the rotor shaft adopts two pairs of permanent magnetic bearings, which are respectively installed at both ends of the motor shaft. The static magnetic ring is the outer magnetic ring, which is fixed by the end cover, and the moving magnetic ring is the inner magnetic ring. The nut is fixed on the rotor shaft, and the two pairs of permanent magnetic bearings are placed in an offset manner. While generating radial support force, it also produces an axial force on the rotor. Due to the direction of the axial force generated by the two pairs of permanent magnetic bearings On the contrary, under the interaction of axial force, the rotor can maintain axial balance, so that the axial position of the rotor can be kept stable, ensuring that the motor can realize the requirements of high speed and high power at the same time. Moreover, the permanent magnetic bearing does not need lubrication, and does not directly contact the rotor to generate friction and heat, which eliminates torque loss, improves motor power, and is easy to control and adjust. In addition, the utility model adopts a disk-type axial motor. When the winding on the stator is energized, the rotor disk is subjected to the force generated by the stators on both sides under the action of electromagnetic induction. The force action is balanced in the axial direction.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic view of the stator structure of the utility model;

Fig. 3 is a schematic view of the structure of the rotor shaft of the present invention;

In the figure: 1 housing, 2 stator, 3 rotor disc, 4 rotor shaft, 5 housing, 6 moving magnetic ring, 7 pump body, 8 roller thrust bearing, 9 small disc, 10 sleeve, 11 impeller, 12 Baffle plate, 13 Lining cover, 14 Water channel, 15 Pump cover, 16 End cover, 17 Static magnetic ring, 18 Stator, 19 Shell, 20 Moving magnetic ring, 21 Bracket, 22 End cover, 23 Roller thrust bearing, 24 Sleeve, 25 static magnetic rings.

Detailed ways

As shown in Figure 1, Figure 2, and Figure 3, the permanent magnetic levitation axial electric pump is mainly composed of permanent magnetic bearings, axial motors, pumps, and mechanical seals. The permanent magnetic bearing group plays a supporting role. It is composed of two pairs of permanent magnetic bearings and positioning nuts. The static magnetic ring 25 and the static magnetic ring 17 of the permanent magnetic bearing are respectively installed in the housing 1 and the housing 5. The static magnetic ring 25 is composed of The end cover 22 is clamped, and the magnetostatic ring 17 is clamped by the end cover 16, and the position of the magnetostatic ring is adjusted by adjusting the thickness of the gaskets at the end covers 22 and 16 respectively. The moving magnetic rings 20 and 6 are fastened on the rotor shaft 4 by nuts respectively, and are placed in a biased position with the static magnetic rings 25 and 17 respectively. Turning the nuts can adjust the positions of the moving magnetic rings 20 and 6. The static magnetic rings 25 and the moving magnetic rings The left end of the ring 20 is the N pole, the right end is the S pole, the left end of the static magnetic ring 17 and the moving magnetic ring 6 are the S pole, and the right end is the N pole. Since the two pairs of permanent magnetic bearings are biased, they will produce The effect of the axial force, the axial forces at both ends cancel each other out, which can make the rotor more stable in the axial direction. If it is detected that the axial displacement of the rotor is too large, the nuts at both ends can be adjusted appropriately to change the position of the moving magnetic ring 10, 6. position, or increase or decrease the thickness of the gaskets at the end caps 22 and 16, and adjust the positions of the static magnetic rings 25 and 17 to achieve the purpose of changing the axial force on the rotor and return the rotor displacement to the required position.

The effect of axial motor is to output torque, and it is made up of stator 2, stator 18, rotor shaft 4, rotor disk 3. The rotor disk of the axial motor is installed in the middle of the stator. When the stator winding is energized, the rotor disk is driven to drive the rotor shaft to rotate and keep its axial stability. Wherein, the rotor shaft 4 is installed in the middle of the electric pump, and the middle of the rotor shaft 4 is connected with a key and fixed with a rotor disc 3 with a nut, and a certain number of shallow grooves are evenly processed on the surface of both sides of the rotor disc 3 . The stator 2 and the stator 18 are installed symmetrically on both sides of the rotor disk 3 . The stator 2 and the housing 1 are designed as a whole, and the stator 18 and the housing 5 are designed as a whole. The stators 2 and 18 are processed with six salient poles with sector-shaped cross-sections. The six salient poles are evenly distributed, and coil windings are wound on them. When the stator coil is energized, under the action of electromagnetic induction, torque is generated, so that the rotor disc 3 drives the rotor shaft 4 to rotate at high speed. The end of the rotor shaft 4 is equipped with an impeller 11, which directly outputs torque to drive the impeller 11 to rotate, and the pump starts Work.

The pump consists of a pump body 7, an impeller 11, a lining cover 13 and a pump cover 15. The pump adopts a split-type spiral pump body, the impeller is a centrifugal impeller, the water inlet is at the center of the pump cover 15, and the water outlet is at the top of the pump. The pump body 7 is bolted to the motor, and the lower end has a groove and a through hole processed at the bottom of the groove. The impeller 11 is installed on the end of the rotor shaft 4 and is connected with a key. The lining cover 13 is installed in the pump cover 15, and grooves and through holes are also arranged below the lining cover, forming a water channel 14 communicating with the groove and the hole on the pump body 7. The pump cover 15 clamps the lining cover 13, and is connected together with the pump body 7 with bolts, and a sealing gasket is installed between the pump cover 15 and the lining cover 13 to prevent water leakage.

The pump body 7 and the end cover 16 are bolted together, and a gasket is installed between the two to prevent liquid from leaking. A roller thrust bearing 8 is housed in the end cover 16, and the roller thrust bearing 8 is sleeved on the rotor shaft 4, and the pump body 7 clamps the roller thrust bearing 8 tightly. The roller thrust bearing 23 is installed in the end cover 22, positioned with the sleeve 24, and the end cover 22 clamps it. Roller thrust bearings 23, 8 are respectively sleeved on the two ends of the rotor shaft 4 to play a position-limiting role, in order to prevent the rotor shaft 4 from bumping into other parts when the electric pump breaks down or stops, causing parts to be damaged or scrapped. The roller thrust bearings 23 and 8 not only limit the radial position of the rotor shaft 4, but also play the role of axial limit. Keep a small gap in the radial direction. When the rotor is too large due to shutdown or fault displacement, the rotor will contact the bearing, and the bearing will rotate with the rotor, so that the rotor will not touch the stator or other components, and it will also prevent the inner and outer magnetic rings of the permanent magnet bearing from phase contact. Collide.

A mechanical sealing device is installed between the pump body 7 and the roller thrust bearing 8, and the mechanical sealing device is composed of a small disc 9, a baffle plate 12, a sleeve 10 and a water channel 14. One end of the sleeve 10 presses the small disk 9 on the rotor shaft 4, and the other end of the sleeve 10 is positioned on the rear surface of the impeller 11, and is clamped by the impeller 11. There is a small gap between the small disc 9 and the pump body 7. When the rotor shaft 4 rotates at a high speed, the small disc 9 also rotates at a high speed. The side facing the sleeve 10 is designed to be concave. The liquid entering the motor through the gap between the barrel 10 and the pump body 7 is thrown onto the surface of the pump body 7, then flows into the water channel 14 below, and flows back to the water inlet through the water channel under the lining cover 13, so as to prevent the liquid from entering the motor. . For better sealing, a circular baffle 12 is clamped between the small disc 9 and the roller thrust bearing 8 with the pump body 7 to prevent splashed liquid from entering the bearing and causing damage to the bearing. The mechanical seal of this design has a simple structure and good sealing effect, because the small disc 9 replaces the sealing ring type mechanical seal, which can completely eliminate the friction between the sealing ring and the rotor, improve the torque output efficiency, and make the levitation motor a Fully suspended.

On the basis of the existing magnetic levitation electric pump, the electric pump of the utility model adopts the passive magnetic levitation mode of the permanent magnetic bearing, has a simple structure and is easy to control, and adopts an axial motor mode, so that the axial size is reduced, and it is convenient to apply to the axial space smaller occasions. In addition, the electric pump of the present invention is designed with a non-contact disc mechanical seal device, which is simple and practical, and has a small volume, which reduces the weight and volume of the entire electric pump. The electric pump provided by the invention is a multi-purpose electric pump with small volume, simple and compact structure, high power density, high control precision, convenient installation and maintenance, high reliability, and can be used in various working occasions.

Claims (6)

1. the axial motor-drive pump of permanent magnetism magnetic suspension, comprise Permanent-magnet bearing, axial direction electric machine and pump, pump is connected in aggregates with the axial direction electric machine installation, it is characterized in that being provided with mechanical seal device between axial direction electric machine and the pump, described Permanent-magnet bearing is provided with magnetostatic ring and moving magnet ring, magnetostatic ring and the biasing of moving magnet ring are placed, and moving magnet ring is installed on the rotor shaft, and magnetostatic ring is installed on the shell of axial direction electric machine group; Described axial direction electric machine comprises stator, rotor shaft, rotor discs, end cap, rotor discs is installed in the middle of the rotor shaft, evenly be processed with shallow slot on the rotor discs both side surface, the rotor discs bilateral symmetry is provided with the installation stator, being evenly distributed with six cross sections on the stator is fan-shaped salient pole, be wound with coil winding above the salient pole, the rotor shaft two ends are provided with roller thrust block, and roller thrust block is stuck on the end cap of two ends.

2. the axial motor-drive pump of permanent magnetism magnetic suspension according to claim 1, it is characterized in that described pump comprises the pump housing, impeller, lining lid and pump cover, the pump housing is split type helical, impeller is installed by key and is connected the rotor shaft end, and the pump cover central position is provided with water intake, and the top of the pump housing is provided with water outlet, the pump housing is connected with bolt with the shell of axial direction electric machine, pump housing bottom is provided with the water channel of groove and through hole formation, and water channel communicates with water intake, and described impeller is a receded disk impeller.

3. the axial motor-drive pump of permanent magnetism magnetic suspension according to claim 1, it is characterized in that described mechanical seal device is made up of roundel, baffle plate, sleeve, roundel is fitted on the rotor shaft by sleeve by impeller, baffle plate is arranged between roundel and the roller thrust block, roundel is a concave surface towards the one side of sleeve, is provided with micro-gap between roundel and the pump housing and communicates with the water channel of pump housing bottom.

4. the axial motor-drive pump of permanent magnetism magnetic suspension according to claim 1 is characterized in that described moving magnet ring one end is provided with the nut of adjusting moving magnet ring and the relative offset position of magnetostatic ring.

5. the axial motor-drive pump of permanent magnetism magnetic suspension according to claim 1 is characterized in that being provided with pad between described magnetostatic ring and the shell.

6. the axial motor-drive pump of permanent magnetism magnetic suspension according to claim 1 is characterized in that described stator and shell are structure as a whole.

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