CN102270918A

CN102270918A - Magnetic coupler with adjustable starting state gap

Info

Publication number: CN102270918A
Application number: CN2011102107160A
Authority: CN
Inventors: 周礼乐; 姜连军; 宋伯声
Original assignee: Rongde (dalian) Electromechanical Engineering Equipment Co Ltd
Current assignee: Rongde (dalian) Electromechanical Engineering Equipment Co Ltd
Priority date: 2011-07-26
Filing date: 2011-07-26
Publication date: 2011-12-07

Abstract

The invention discloses a magnetic coupler with an adjustable starting state gap. The magnetic coupler disclosed by the invention comprises a shaft (5), magnetic rotors (1) and (2), copper rotors (3) and (4) and a stop dog (6), wherein the magnetic rotors (1) and (2) can freely slide on the shaft (5); the copper rotors (3) and (4) are fixed in axial positions; the stop dog (6) with adjustable axial length is installed on the magnetic rotor (1); and a gap (7) between the magnetic rotor (1) and the copper rotor (3) and a gap (8) between the magnetic rotor (2) and the copper rotor (4) are adjustable. In the magnetic coupler with the adjustable starting state gap disclosed by the invention, when the magnetic rotors and a working machine operate under design working conditions and when the rotating speed difference between the copper rotors and the magnetic rotors is small, the gaps return to the minimum value of the design; and when a system overloads, i.e., the torques of the magnetic rotors and the working machine are abnormally increased and the rotating speeds of the magnetic rotors and the working machine are obviously reduced, the gaps between the magnetic rotors and the copper rotors are large and the transfer torque of the magnetic coupler is small, thereby protecting a power machine.

Description

The magnetic coupling of starting state adjustable gaps

Technical field

The present invention relates to a kind of magnetic coupling of starting state adjustable gaps.

Background technology

With permanent magnetism power can transfer torque be the technology of knowing altogether, magnetic coupling is based on the actuated element of a kind of transferring power of this technology, one side of magnetic coupling is the permanent magnet (title magnet rotor) that polarity arranges according to certain rules to be installed and opposite side is equipped with copper dish (title copper rotor), when power drives the copper rotor rotation, the magnetic line of force by copper dish cutting permanent magnet, on the copper dish, produce eddy current, and the magnetic field interaction of the magnetic field of eddy current and permanent magnet makes magnet rotor rotate with copper rotor, gapped between them without any mechanical connection, they respectively with engine, working machine connects, just can give working machine with the transmission of power of engine, and the gap length between them has determined the size of transferring power ability, the ability of the big more then transferring power in gap is more little, when the magnetic field interaction of the magnetic field of eddy current and permanent magnet makes magnet rotor rotate with copper rotor, also has axial thrust load, its size is relevant with the speed discrepancy between magnet rotor and the copper rotor, and big more then each other the axial thrust of speed discrepancy is big more.

Summary of the invention

The magnetic coupling that the purpose of this invention is to provide a kind of starting state adjustable gaps.

The technical scheme that the present invention is adopted for achieving the above object is: a kind of magnetic coupling of starting state adjustable gaps, comprise axle (5), copper rotor (3), copper rotor (4) that the magnet rotor (1) that can be free to slide on axle (5), magnet rotor (2) and axial location are fixing, the adjustable block of axial length (6) is installed on the described magnet rotor (1), and the gap (8) between gap (7) between magnet rotor (1), the copper rotor (3) and magnet rotor (2), the copper rotor (4) is adjustable.

During inactive state, the gap (8) between gap (7) between magnet rotor (1), the copper rotor (3) and magnet rotor (2), the copper rotor (4) is a minimum value, and block (6) in a state of nature.

When starting state, when engine drives copper rotor (3) and copper rotor (4) rotation and magnet rotor (1) and magnet rotor (2) during also in inactive state, speed discrepancy maximum between copper rotor (3), copper rotor (4) and magnet rotor (1), the magnet rotor (2), the axial force maximum.

The magnetic coupling of a kind of starting state adjustable gaps of the present invention, when magnet rotor and working machine when design condition are moved, speed discrepancy between copper rotor and the magnet rotor hour, its gap can be got back to the minimum value of design again, and the state of block also keeps this state at this moment, and promptly movably distance is very big for two magnet rotors; When system overloads; be that the moment of torsion of magnet rotor and working machine increases improperly and the rotating speed of magnet rotor and working machine descends significantly; just the speed discrepancy between magnet rotor and the copper rotor obviously becomes big; it is big that axial force between them becomes; two magnet rotors are pushed open (when removable magnet rotor and working machine move in design condition magnet rotor movably ultimate range) by copper rotor; at this time the gap between magnet rotor and the copper rotor is very big; the transfer torque of magnetic coupling is just very little, and engine will be protected like this.

Description of drawings

Fig. 1 is that the magnetic coupling inactive state of a kind of starting state adjustable gaps of the present invention is the structure chart of block in reset condition.

Fig. 2 is the magnetic coupling of a kind of starting state adjustable gaps of the present invention when starting back magnet rotor and working machine and reaching certain rotating speed, and block changes the sketch of state under centrifugal action.

Fig. 3 is the sketch of magnetic coupling when overload of a kind of starting state adjustable gaps of the present invention.

Among the figure: 1, magnet rotor; 2, magnet rotor; 3, copper rotor; 4, copper rotor; 5, axle; 6, block; 7, gap; 8, gap; 9, locating surface; 10, locating surface.

Embodiment

As Fig. 1, Fig. 2 and shown in Figure 3, the magnetic coupling of starting state adjustable gaps comprises that magnet rotor 1, magnet rotor 2, copper rotor 3, copper rotor 4, magnet rotor 1, magnet rotor 2 can be free to slide on axle 5; Axial location between copper rotor 3, the copper rotor 4 is fixed; The block 6 that is subjected to centrifugal action can change state is installed on the magnet rotor 1, during inactive state, gap 7 between magnet rotor 1, magnet rotor 2 and the

copper rotor

3,4 and 8 minimum values for design, block 6 is in a state of nature, at this moment, locating surface 9 and locating surface 10 location minimum clearance 7 and gaps 8; When starting state, when engine drives that copper rotor 3 and 4 copper rotors rotate and

magnet rotor

1 and 2 during also in inactive state, it is the speed discrepancy maximum between copper rotor 3, copper rotor 4 and magnet rotor 1, the magnet rotor 2, the axial force maximum between them then, because the axial location of copper rotor 3 and copper rotor 4 is fixed, so under the effect of axial force, run into magnet rotor 2 at the block 6 that the

magnet rotor

1 and 2 that is free to slide on the axle 5 is pulled on the magnet rotor 1, this moment,

gap

7 and 8 just became big, so just can realize " soft start " of working machine; At magnet rotor 1 and magnet rotor 2(and working machine together) start the back raising speed and block 6 change state under action of centrifugal force as shown in Figure 2 when reaching certain rotating speed, magnet rotor 1, magnet rotor 2 movably distance increase; When magnet rotor 1, magnet rotor 2 and working machine when design condition are moved, speed discrepancy between copper rotor 3, copper rotor 4 and magnet rotor 1, the magnet rotor 2 is less, its gap 7, gap 8 can be got back to the minimum value of design again, and this moment block state also keep the state of similar Fig. 2, promptly movably distance is very big for magnet rotor 1, magnet rotor 2; When system overloads; it is magnet rotor 1; the moment of torsion of magnet rotor 2 and working machine increases improperly; and magnet rotor 1; the rotating speed of magnet rotor 2 and working machine descends significantly; just magnet rotor 1; magnet rotor 2 and copper rotor 3; it is big that speed discrepancy between the copper rotor 4 obviously becomes; it is big that axial force between them becomes; magnet rotor 1; magnet rotor 2 is by copper rotor 3; copper rotor 4 is pushed open; can be till the link stopper 6 of magnet rotor and Fig. 2 state be run into; at this time magnet rotor 1; magnet rotor 2 and copper rotor 3; gap 7 between the copper rotor 4; gap 8 is very big; the transfer torque of magnetic coupling is just very little; engine will be protected like this; magnet rotor 1 after engine is shut down; magnet rotor 2 and copper rotor 3; gap 7 between the copper rotor 4; the minimum value of design is got back in gap 8 again, and the state of Fig. 1 is also got back in the position of block 6.

Claims

1. the magnetic coupling of a starting state adjustable gaps, it is characterized in that: comprise axle (5), copper rotor (3), copper rotor (4) that the magnet rotor (1) that can be free to slide on axle (5), magnet rotor (2) and axial location are fixing, the adjustable block of axial length (6) is installed on the described magnet rotor (1), and the gap (8) between gap (7) between magnet rotor (1), the copper rotor (3) and magnet rotor (2), the copper rotor (4) is adjustable.

2. the magnetic coupling of a kind of starting state adjustable gaps according to claim 1, it is characterized in that: during inactive state, gap (8) between gap (7) between magnet rotor (1), the copper rotor (3) and magnet rotor (2), the copper rotor (4) is a minimum value, and block (6) in a state of nature.

3. the magnetic coupling of a kind of starting state adjustable gaps according to claim 1, it is characterized in that: when starting state, when engine drives copper rotor (3) and copper rotor (4) rotation and magnet rotor (1) and magnet rotor (2) during also in inactive state, speed discrepancy maximum between copper rotor (3), copper rotor (4) and magnet rotor (1), the magnet rotor (2), the axial force maximum.