Centering device of cylindrical synchronous permanent magnet coupling and permanent magnet coupling

Abstract

The centering device is simple in centering, safe and reliable, comprises an outer rotor and an inner rotor, and is characterized in that at least three outer rotor positioning grooves are formed in the end face of one end of the outer rotor, and an outer rotor positioning bearing is mounted in each outer rotor positioning groove; the outer ring of the outer rotor positioning bearing is in contact with the outer surface of the inner rotor; the end face of one end of the inner rotor is provided with at least three inner rotor positioning grooves, each inner rotor positioning groove is internally provided with an inner rotor positioning bearing, and the outer ring of each inner rotor positioning bearing is in contact with the inner surface of the outer rotor; the centering device is simple in structure, coaxial positioning of the outer rotor and the inner rotor is guaranteed, the permanent magnet coupler adopting the centering device is convenient to install, installation time is greatly saved, meanwhile, when the permanent magnet coupler works, the centering device does not need to be disassembled, and coaxiality of the outer rotor and the inner rotor is guaranteed under extreme working conditions.

Description

Technical Field

[0001] The utility model relates to the field of mechanical transmission, in particular to a cylindrical synchronous permanent magnetic coupling, in particular to a centering device of a cylindrical synchronous permanent magnetic coupling which is simple in centering, safe and reliable, and a permanent magnetic coupling. Background Art

[0002] Permanent magnetic couplings are widely used in sealed transmission machinery in the chemical, electroplating, papermaking, pharmaceutical, food, vacuum and other industries. It is divided into two types in terms of structure: disc type and barrel type. Since there is an axial force between the two annular magnets, the axial force is very large when the power is large, and it is difficult to overcome it, so it is generally less used. In order to avoid the generation of additional axial force after installation, a barrel structure is generally adopted. However, the existing barrel type synchronous permanent magnetic coupling mostly adopts an axial assembly method, that is, the inner rotor is first installed on the load shaft, and the outer rotor is installed on the drive shaft, and then the inner rotor and the outer rotor are combined together. Due to the attraction between the permanent magnetic steel on the outer rotor and the permanent magnetic steel on the inner rotor, it is difficult to ensure the coaxiality of the outer rotor and the inner rotor during assembly. If you are not careful, the permanent magnetic steel on the outer rotor and the permanent magnetic steel on the inner rotor will be adsorbed together and difficult to separate. At the same time, after the installation is completed, the coaxiality of the two permanent magnetic rotors is difficult to ensure, that is, the air gap between the two permanent magnetic rotor magnets is uneven, which will cause additional vibration during the operation.

[0003] To this end, Document 1: (Application No. 201610380133.5) discloses a magnetic coupling and an installation method thereof, which utilizes a positioning connection piece to combine an inner permanent magnet rotor and an outer permanent magnet rotor together. Therefore, during the installation process, i.e., when connecting the drive shaft to the outer (or inner) permanent magnet rotor of the magnetic coupling and connecting the load shaft to the inner (or outer) permanent magnet rotor of the magnetic coupling, the inner permanent magnet rotor and the outer permanent magnet rotor are rigidly connected together by the positioning connection piece, so that the inner permanent magnet rotor and the outer permanent magnet rotor will not be adsorbed together, thereby ensuring the coaxiality of the two rotors, i.e., ensuring the uniformity of the air gap. After the installation is completed, the positioning connection piece of the magnetic coupling is removed.

[0004] Document 2 (patent number 201821910353.5) discloses a magnetic coupling with a conical surface positioning structure, which roughly coaxially positions the inner and outer permanent magnet rotors of the magnetic coupling through the conical surface positioning structure. After the coupling is installed between the drive shaft and the load shaft, the outer rotor carrier and the positioning cone sleeve with the same outer diameter are accurately aligned and aligned. Then, the positioning cone sleeve is axially moved a predetermined distance to the limit baffle through the action of the support screw, so that the conical surface gap can be accurately controlled to ensure the uniformity of the magnetic coupling air gap, and the cone sleeve is axially locked by the locking screw so that the conical surface gap is smaller than the magnetic coupling air gap, thereby realizing non-contact magnetic coupling transmission.

[0005] Both Documents 1 and 2 use a connecting piece to assemble the outer rotor and the inner rotor as a whole to ensure the coaxiality of the outer rotor and the inner rotor, and then connect the outer rotor to the drive shaft and the inner rotor to the load shaft. After the installation is completed, the connecting piece is loosened or removed to ensure the normal operation of the magnetic coupling. However, Documents 1 and 2 do not actually solve how to maintain the coaxiality of the outer rotor and the inner rotor when assembling them. During the assembly process, it is difficult to ensure the coaxial assembly of the outer rotor and the inner rotor, and auxiliary devices are also required for positioning and assembly; secondly, since the assembled outer rotor and the inner rotor are rigidly connected together by the positioning connecting piece, the permanent magnetic coupling needs to be removed or loosened when it is used. In this way, when the equipment vibrates violently or is overloaded during operation or the drive end component and the load end component cannot ensure the coaxiality of the drive shaft and the load shaft, the coaxiality of the outer rotor and the inner rotor cannot be ensured, resulting in serious consequences such as equipment damage; thirdly, the setting of components unrelated to power coupling makes the structure of the permanent magnetic coupling complex and heavy, and it is easy to produce instability and failure during high-speed rotation. Summary of the invention

[0006] The utility model aims to provide a centering device of a cylindrical synchronous permanent magnetic coupling and a permanent magnetic coupling which are simple in centering, safe and reliable.

[0007] The utility model adopts the following technical scheme to achieve its invention purpose: a centering device of a cylindrical synchronous permanent magnet coupling, which includes an outer rotor and an inner rotor, at least three outer rotor positioning grooves are provided on the end surface of one end of the outer rotor, an outer rotor positioning bearing is installed in each outer rotor positioning groove, and the outer ring of the outer rotor positioning bearing contacts the outer surface of the inner rotor; at least three inner rotor positioning grooves are provided on the end surface of one end of the inner rotor, an inner rotor positioning bearing is installed in each inner rotor positioning groove, and the outer ring of the inner rotor positioning bearing contacts the inner surface of the outer rotor.

[0008] The outer rotor locating bearing of the utility model is installed in the outer rotor locating groove through the locating shaft, and the locating shaft is fixed to the outer rotor through fixing screws; the inner rotor locating bearing is installed in the inner rotor locating groove through the locating shaft, and the locating shaft is fixed to the inner rotor through fixing screws.

[0009] The outer rotor locating bearing and the inner rotor locating bearing of the utility model are deep groove ball bearings.

[0010] A permanent magnet coupling using the centering device of the cylindrical synchronous permanent magnet coupling as described above.

[0011] Due to the adoption of the above technical scheme, the utility model achieves the purpose of the invention better. The centering device has a simple structure, which ensures the coaxial positioning of the outer rotor and the inner rotor. The permanent magnet coupling is easy to install, which greatly saves the installation time. At the same time, when the permanent magnet coupling is working, there is no need to remove its centering device, and the coaxiality of the outer rotor and the inner rotor is also guaranteed under extreme working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 yes Figure 1 AA section view;

[0014] Figure 3 yes Figure 1 BB cross-sectional view.

[0015] 1. Driving end sleeve 2. Outer rotor 3. Outer rotor permanent magnet ring 4. Inner rotor permanent magnet ring 5. Inner rotor 6. Fixing screw 7. Outer rotor locating bearing 8. Locating shaft 9. Driven end sleeve 10. Inner rotor locating bearing 11. Inner rotor locating groove 12. Outer rotor locating groove DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Depend on Figure 1 , Figure 2 , Figure 3 It can be seen that a centering device of a cylindrical synchronous permanent magnet coupling includes an outer rotor 2 and an inner rotor 5. At least three outer rotor positioning grooves 12 are provided on the end face of one end of the outer rotor 2, and an outer rotor positioning bearing 7 is installed in each outer rotor positioning groove 12, and the outer ring of the outer rotor positioning bearing 7 is in contact with the outer surface of the inner rotor 5; at least three inner rotor positioning grooves 11 are provided on the end face of one end of the inner rotor 5, and an inner rotor positioning bearing 10 is installed in each inner rotor positioning groove 11, and the outer ring of the inner rotor positioning bearing 10 is in contact with the inner surface of the outer rotor 2.

[0018] The outer rotor locating bearing 7 of the utility model is installed in the outer rotor locating groove 12 through the locating shaft 8, and the locating shaft 8 is fixed to the outer rotor 2 through the fixing screw 6; the inner rotor locating bearing 10 is installed in the inner rotor locating groove 11 through the locating shaft 8, and the locating shaft 8 is fixed to the inner rotor 5 through the fixing screw 6.

[0019] The outer rotor locating bearing 7 and the inner rotor locating bearing 10 of the utility model are deep groove ball bearings.

[0020] A permanent magnet coupling using the centering device of the cylindrical synchronous permanent magnet coupling as described above.

[0021] like Figure 2 , Figure 3 As shown, in this embodiment, there are four positioning grooves on the outer rotor 2 and the inner rotor 5, which are symmetrically arranged.

[0022] During assembly of this embodiment, the outer rotor permanent magnet ring 3 is first installed on the inner wall of the outer rotor 2, and the inner rotor permanent magnet ring 4 is installed on the outer wall of the inner rotor 5; then, the assembled inner rotor 5 is placed into the assembled outer rotor 2 through the centering of the outer rotor locating bearing 7 on the outer rotor 2 and the inner rotor locating bearing 10 on the inner rotor 5; finally, the outer rotor 2 is connected to the driving end sleeve 1, and the inner rotor 5 is connected to the driven end sleeve 9, thus completing the assembly of the permanent magnet coupling.

[0023] The centering device of the utility model has a simple structure, which ensures the coaxial positioning of the outer rotor 2 and the inner rotor 5. The permanent magnetic coupling is easy to install, which greatly saves installation time. At the same time, when the permanent magnetic coupling is working, there is no need to remove its centering device, and the coaxiality of the outer rotor 2 and the inner rotor 5 is also ensured under extreme working conditions.

Claims

1. A centering device for a cylindrical synchronous permanent magnetic coupling, comprising an outer rotor and an inner rotor, characterized in that At least three outer rotor positioning grooves are provided on the end surface of one end of the outer rotor, and an outer rotor positioning bearing is installed in each outer rotor positioning groove, and the outer ring of the outer rotor positioning bearing contacts the outer surface of the inner rotor; at least three inner rotor positioning grooves are provided on the end surface of one end of the inner rotor, and an inner rotor positioning bearing is installed in each inner rotor positioning groove, and the outer ring of the inner rotor positioning bearing contacts the inner surface of the outer rotor.

2. The centering device of the cylindrical synchronous permanent magnetic coupling according to claim 1 is characterized in that The outer rotor locating bearing is installed in the outer rotor locating groove through the locating shaft, and the locating shaft is fixed to the outer rotor through the fixing screw; the inner rotor locating bearing is installed in the inner rotor locating groove through the locating shaft, and the locating shaft is fixed to the inner rotor through the fixing screw.

3. The centering device of the cylindrical synchronous permanent magnetic coupling according to claim 1 is characterized in that The outer rotor locating bearing and the inner rotor locating bearing are deep groove ball bearings.

4. A permanent magnetic coupling, characterized in that It comprises a centering device for a cylindrical synchronous permanent magnetic coupling as described in claim 1, 2 or 3.

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