CN219718007U - A fuel cell hydrogen circulation pump permanent magnet hybrid bearing rotor system - Google Patents

Abstract

The utility model relates to a permanent magnet hybrid bearing rotor system for a fuel cell hydrogen circulation pump. The rotor shaft is sleeved on the inner ring of a magnet base through a ball bearing. The magnet base supports and connects magnets. An inner ring boss is provided on the inner ring of the magnet base. The limit between the inner ring boss and the lower end of the ball bearing outer ring is the permanent magnet bearing outer ring that is sleeved on the inner ring of the magnet base. The outer ring boss is set on the rotor shaft, and the outer ring boss is between the outer ring boss and the lower end of the ball bearing inner ring. The limit set is sleeved on the inner ring of the permanent magnetic bearing on the rotor shaft. In the use of paired axial motors, the layout of the inner and outer rings of ball bearings and permanent magnetic bearings is combined. The structure is simple and compact, which can fully offset the large axial force of a single disc motor on the rotor and ball bearings, and at the same time play a role in radial protection. The load-bearing function greatly improves the stability of the product and the reliability of the overall structure and bearings.

Description

A fuel cell hydrogen circulation pump permanent magnet hybrid bearing rotor system

Technical field

The utility model relates to a rotor, specifically a permanent magnet hybrid bearing rotor system of a fuel cell hydrogen circulation pump.

Background technique

The drive motor of the hydrogen circulation pump is mainly divided into two categories, one is the radial motor and the other is the axial motor. The magnetic pulling force of a radial motor is radial and cancels out each other along the circumference, that is, the resultant magnetic pulling force is zero, but its axial size is larger than that of an axial motor. As for axial motors, the magnetic pulling force is axial, the torque is large, and the axial size is small.

Judging from the current products on the market, hydrogen cycle machines are mainly vortex pumps. The axial motor hydrogen circulation pump is the main structure currently used in hydrogen pump products. This type of hydrogen circulation pump has a large axial force, which accelerates the failure of traditional bearing systems and shortens the service life of traditional bearings. In addition, due to the large outer diameter of the disc motor, the relative change in the atmosphere between the stator and the rotor is large. , so there are relatively large axial force fluctuations, which pose greater challenges to the supporting bearings and reduce the reliability of the bearing system.

Contents of the invention

The utility model provides a fuel cell hydrogen circulation pump permanent magnet hybrid bearing rotor system that has a simple structure and can effectively solve the problem of the impact of large axial force on bearing reliability and service life.

The technical solution adopted by the utility model is: a fuel cell hydrogen circulation pump permanent magnet hybrid bearing rotor system, which includes a rotor shaft, a magnet base, a magnet and an impeller. It is characterized in that: the rotor shaft is sleeved on the magnet through a ball bearing. The inner ring of the base supports and connects the magnets. The inner ring of the magnet base is provided with an inner ring boss. The limit between the inner ring boss and the lower end of the ball bearing outer ring is a permanent magnet bearing outer ring that is sleeved on the inner ring of the magnet base. , the outer ring boss is set on the rotor shaft, the limit between the outer ring boss and the lower end of the ball bearing inner ring is set to the permanent magnetic bearing inner ring that is sleeved on the rotor shaft, and the radial clearance of the inner and outer rings of the permanent magnetic bearing is set accordingly. , the outer ring of the permanent magnetic bearing is composed of upper, middle and lower outer ring permanent magnet rings. The magnetization direction of the upper and lower outer ring permanent magnet rings is toward the middle and outer ring permanent magnet rings. The magnetization direction of the middle and outer ring permanent magnet rings is toward the permanent magnet. The outer ring of the bearing is radially inward. The inner ring of the permanent magnetic bearing is composed of upper, middle and lower inner ring permanent magnet rings. The magnetization direction of the upper and lower inner ring permanent magnet rings is toward the middle inner ring permanent magnet ring. The magnetization direction of the magnet ring is toward the radial outer side of the inner ring of the permanent magnetic bearing; the middle inner ring permanent magnet ring and the middle outer ring permanent magnet ring have overlapping sections in the axial direction.

The upper end of the ball bearing is connected to the rotor shaft via screws and is positioned by pressing the gland.

A magnet installation step is provided on the magnet base, and the magnet is supported and linked to the magnet base through glue connection or screw locking.

There is a bushing set on the rotor shaft between the outer ring boss and the inner ring of the permanent magnet.

A bushing is connected to the rotor shaft, and the inner ring of the permanent magnet is positioned between the bushing and the lower end of the inner ring of the ball bearing.

When the utility model is used in paired axial motors, the layout of the ball bearings and the inner and outer rings of the permanent magnetic bearings is combined, and the structure is simple and compact, which can fully offset the large axial force of a single disc motor on the rotor and ball bearings, and at the same time It plays a radial load-bearing role, greatly improving the stability of the product and the reliability of the overall structure and bearings.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model;

Figure 2 is a schematic structural diagram of the inner and outer rings of the permanent magnetic bearing of the present invention.

In the picture: axis motor stator 1, rotor shaft 2, outer ring boss 3, screw 4, gland 5, ball bearing 6, magnet base 7, inner ring boss 8, magnet 9, permanent magnet bearing outer ring 10, upper Outer ring permanent magnet ring 11, middle outer ring permanent magnet ring 12, lower outer ring permanent magnet ring 13, permanent magnet bearing inner ring 14, upper inner ring permanent magnet ring 15, middle inner ring permanent magnet ring 16, lower inner ring permanent magnet Ring 17, impeller 18, back plate 19.

Detailed ways

The following is further explained in conjunction with the accompanying drawings.

Figures 1 and 2 show: a fuel cell hydrogen circulation pump permanent magnet hybrid bearing rotor system, including a rotor shaft 2, screws 4, gland 5, ball bearing 6, magnet base 7, magnet 9, and permanent magnet bearing outer ring 10 , permanent magnetic bearing inner ring 14. The rotor shaft 2 is connected to the inner ring of the magnet base 7 via a ball bearing 6. The upper end of the ball bearing 6 is connected to the rotor shaft 2 via a screw 4 and is positioned by a gland 5 for crimping. The magnet base 7 supports and connects the magnet 9. The inner ring of the magnet base is provided with an inner ring boss 8. The limit set between the inner ring boss 8 and the lower end of the outer ring of the ball bearing 6 is sleeved on the outside of the permanent magnetic bearing on the inner ring of the magnet base. Ring 10, the outer ring boss 3 is set on the rotor shaft 2, the limit between the outer ring boss 3 and the lower end of the inner ring of the ball bearing 6 is the permanent magnet bearing inner ring 14, which is sleeved on the rotor shaft. The radial clearance of the outer ring is set correspondingly. The permanent magnet bearing outer ring 10 is composed of upper, middle and lower outer ring permanent magnet rings 11, 12, 13. The magnetization direction of the upper and lower outer ring permanent magnet rings is toward the middle and outer ring permanent magnet rings. The magnetization direction of the middle and outer permanent magnet rings is radially inward of the permanent magnet bearing outer ring. The permanent magnet bearing inner ring 14 is composed of upper, middle and lower inner ring permanent magnet rings 15, 16 and 17. The upper and lower inner ring permanent magnet rings The magnetization direction of the middle and inner permanent magnet rings is toward the radial outer side of the inner ring of the permanent magnet bearing; the middle and inner permanent magnet rings and the middle and outer permanent magnet rings have overlapping sections in the axial direction.

In this embodiment, a magnet installation step is provided on the magnet base, and the magnet is supported and linked to the magnet base through glue connection or screw locking.

In this embodiment, the rotor system is arranged corresponding to the stator 1 of the axial motor. The magnet base 7 and the back plate 19 sleeved thereon are pressed and connected to the impeller 18 through screw locking. This technology is patented by the applicant earlier. has been made public.

In this embodiment, the overlapping range of the inner and outer rings of the permanent magnetic bearing in the axial direction can be adjusted through the bushing. Bushing support adjustment can also be used directly.

The layout of the inner and outer rings of the permanent magnetic bearing and the ball bearings of this system are as shown in the figure. The inner and outer rings of the permanent magnetic bearing form a permanent magnetic bearing, which utilizes the axial bearing capacity generated by the permanent magnetic bearing (the rotor shaft is subjected to the pulling force of the permanent magnetic bearing). ), offset the axial pulling force of the axial motor stator and rotor shaft (received by the pulling force of the axial motor stator). The outer ring of the permanent magnetic bearing is fixed on the inner ring of the rotating magnet base, and the inner ring of the permanent magnetic bearing is fixed on the rotor shaft, which is finally adjusted by the bushing. The magnetic pull of the permanent magnet bearing is slightly smaller than that of the axial motor when designed. The ball bearing takes on the rest and pre-tightens the entire rotor shaft, which ensures the axial rigidity of the rotor shaft and greatly reduces the axial load of the ball bearing. force, improving the reliability of the entire system. In addition, the inner and outer rings of the permanent magnetic bearing have sufficient load-bearing capacity in the radial direction and sufficient axial length. At the same time, the rotor shaft has minimal swing. The permanent magnetic bearing does not require a control system. The permanent magnetic levitation has no additional friction loss and no magnetic field changes. Eddy current loss, the loss mainly comes from a single ball bearing (and its force is smaller, the loss is lower than conventional applications), which improves the performance of the product and the service life of the bearing as a whole.

Claims (5)

1. The utility model provides a fuel cell hydrogen circulating pump permanent magnetism hybrid bearing rotor system, includes rotor shaft, magnet base, magnet and impeller, its characterized in that: the rotor shaft is sleeved on an inner ring of the magnet base through a ball bearing, the magnet base is supported and connected with a magnet, an inner ring boss is arranged on an inner ring of the magnet base, a permanent magnet bearing outer ring sleeved on the inner ring of the magnet base is limited between the inner ring boss and the lower end of the ball bearing outer ring, an outer ring boss is arranged on the rotor shaft, a permanent magnet bearing inner ring sleeved on the rotor shaft is limited between the outer ring boss and the lower end of the ball bearing inner ring, radial gaps of the inner ring and the outer ring of the permanent magnet bearing are correspondingly arranged, the outer ring of the permanent magnet bearing is composed of an upper outer ring permanent magnet ring, a middle outer ring permanent magnet ring and a lower outer ring permanent magnet ring, the magnetization direction of the upper outer ring permanent magnet ring and the lower outer ring permanent magnet ring is towards the radial inner ring of the permanent magnet bearing, and the magnetization direction of the middle inner ring permanent magnet ring is towards the radial outer side of the permanent magnet bearing inner ring; the middle inner ring permanent magnet ring and the middle outer ring permanent magnet ring are provided with overlapping sections in the axial direction.

2. The fuel cell hydrogen circulation pump permanent magnet hybrid bearing rotor system according to claim 1, characterized in that: the upper end of the ball bearing is connected with the rotor shaft through a screw and is pressed and positioned by the gland.

3. The fuel cell hydrogen circulation pump permanent magnet hybrid bearing rotor system according to claim 1, characterized in that: the magnet base is provided with a magnet mounting step, and the magnet is connected to the magnet base through gluing or screw locking support.

4. The fuel cell hydrogen circulation pump permanent magnet hybrid bearing rotor system according to claim 1, characterized in that: and a bushing sleeved on the rotor shaft is arranged between the outer ring boss and the permanent magnet inner ring.

5. The fuel cell hydrogen circulation pump permanent magnet hybrid bearing rotor system according to claim 1, characterized in that: and the rotor shaft is sleeved with a bushing, and the permanent magnet inner ring is positioned between the bushing and the lower end of the ball bearing inner ring.