Permanent magnet coupling for air pre-heater

Abstract

The utility model discloses a permanent magnet coupling coupling for air pre-heater, including driving rotating shaft and driven rotating shaft, the end of driving rotating shaft and the end of driven rotating shaft are both sleeved with bridging connecting sleeve, the inner wall of bridging connecting sleeve is welded with elastic band, the end of driving rotating shaft and the end of driven rotating shaft are both welded with the elastic band, and the end of driving rotating shaft and the end of driven rotating shaft are both welded with the elastic band. An air pre-heater relates to the technical field of air pre-heaters, a bridge connection sleeve is arranged for butt joint of a driving rotating shaft and a driven rotating shaft, an elastic band is welded between the driving rotating shaft and the bridge connection sleeve and between the driven rotating shaft and the bridge connection sleeve, and therefore buffering and damping during rotating shaft operation can be achieved through the elastic band; a first spline on the first inserting pin and a second spline on the second inserting pin are inserted into spline grooves in the two sides of the bridging connecting sleeve correspondingly, and the effect of reinforcing connection between the driving rotating shaft and the driven rotating shaft is achieved. Meanwhile, connection between the driving rotating shaft and the driven rotating shaft is further enhanced through the connecting rod, and the purpose of limiting and protecting the vibration amplitude of the rotating shafts is achieved.

Description

Technical Field

[0001] This utility model relates to the field of air preheater technology, specifically to a permanent magnet coupling used in an air preheater. Background Technology

[0002] Utility model patent CN210536486U discloses a permanent magnet coupling used on an air preheater motor, comprising a drive shaft and a driven shaft. A flange sleeve A is fixed on the drive shaft, with one end of the drive shaft passing through the flange sleeve A and fixed to it. An outer rotor is fixed on the side of the flange sleeve A away from the drive shaft, with one end of the flange sleeve A extending into the outer rotor and fixed to it. A flange sleeve B is fixed on the driven shaft, with one end of the driven shaft extending into the flange sleeve B and fixed to it. An inner rotor is fixed on the side of the flange sleeve B away from the driven shaft, with one end of the flange sleeve B extending into the inner rotor and fixed to it. The side of the inner rotor away from the flange sleeve B extends into the aforementioned outer rotor. There is a gap between the inner rotor and the outer rotor. The drive shaft on the motor and the driven shaft on the gearbox are connected by a permanent magnet coupling. The drive shaft is fixed to the outer rotor via flange sleeve A, and the driven shaft is fixed to the inner rotor via flange sleeve B. Both the inner and outer rotors are permanent magnet rotors, and there is a gap between them, meaning they do not contact each other in space. The inner and outer rotors drive the load to rotate using their mutual magnetic force. When the motor malfunctions, it can be directly removed for offline repair. After repair, it can be directly reinstalled on the air preheater gearbox, improving the reliability of safe operation. The gap between the inner and outer rotors prevents collisions and friction during operation and effectively avoids wear on the motor drive shaft, preventing drive shaft seizure and motor rotor rubbing.

[0003] The above-mentioned patents have the following shortcomings:

[0004] The drive shaft and driven shaft are connected by an outer rotor and a flange bushing, which means that the drive shaft and driven shaft are rigidly connected and cannot achieve the purpose of vibration reduction. Utility Model Content

[0005] In view of the problems existing in the permanent magnet coupling used in an existing air preheater, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a permanent magnet coupling coupling for use in air preheaters, which solves the problem that the connection between the drive shaft and the driven shaft is through an external rotor and a flange bushing, i.e., the connection between the drive shaft and the driven shaft is rigid and cannot achieve the purpose of vibration reduction.

[0007] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0008] A permanent magnet coupling for use in an air preheater includes a driving shaft and a driven shaft. The ends of the driving shaft and the driven shaft are jointly fitted with a bridging connecting sleeve. An elastic band is welded to the inner wall of the bridging connecting sleeve. The ends of the driving shaft and the driven shaft are both welded to the elastic band.

[0009] As a preferred embodiment of the permanent magnet coupling used in the air preheater of this utility model, the end of the driving shaft is integrally provided with a first insertion pin, and the end of the driven shaft is integrally provided with a second insertion pin, wherein the first insertion pin and the second insertion pin are respectively inserted into the two ends of the bridging connecting sleeve.

[0010] As a preferred embodiment of the permanent magnet coupling used in the air preheater described in this utility model, the bridging connecting sleeve has spline grooves at both ends, the outer wall of the first insertion pin has an integral first spline, the outer wall of the second insertion pin has an integral second spline, and the first spline and the second spline are respectively located in the spline grooves at both ends of the bridging connecting sleeve.

[0011] As a preferred embodiment of the permanent magnet coupling used in the air preheater described in this utility model, the first spline and the second spline are both smaller than the spline groove, and the diameters of the first insertion pin and the second insertion pin are both slightly smaller than the inner diameter of the bridging connection sleeve.

[0012] As a preferred embodiment of the permanent magnet coupling used in the air preheater of this utility model, the driving shaft has an integrally formed first flange, the driven shaft has an integrally formed second flange, and both the first flange and the second flange have a gap with the bridging connecting sleeve.

[0013] In a preferred embodiment of the permanent magnet coupling used in the air preheater described in this utility model, the first flange, the bridging connecting sleeve, and the second flange are all connected to a connecting rod, a limiting sleeve is fitted on the connecting rod, and the limiting sleeve and the connecting rod are fixed together by bolts.

[0014] As a preferred embodiment of the permanent magnet coupling used in the air preheater described in this utility model, the first flange, the bridging connecting sleeve, and the second flange are respectively provided with a first through hole, a second through hole, and a third through hole.

[0015] Compared with existing technologies:

[0016] 1. By setting up a bridging connecting sleeve to connect the driving shaft and the driven shaft, and both the driving shaft and the driven shaft are welded to the bridging connecting sleeve with an elastic band, the elastic band can achieve buffering and shock absorption when the shaft is running.

[0017] 2. The first spline on the first connector and the second spline on the second connector are respectively inserted into the spline grooves on both sides of the bridging connecting sleeve, which serves to reinforce the connection between the driving shaft and the driven shaft. At the same time, the connecting rod further strengthens the connection between the driving shaft and the driven shaft, and also limits and protects the vibration amplitude of the shaft. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model;

[0019] Figure 2 Provided for Embodiment 1 of this utility model Figure 1 Exploded view;

[0020] Figure 3 Provided for Embodiment 1 of this utility model Figure 1 Side view sectional view;

[0021] Figure 4 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0022] Figure 5 Provided for Embodiment 2 of this utility model Figure 4 Exploded view.

[0023] In the figure: driving shaft 1, first flange 11, first through hole 111, first plug pin 12, first spline 121, bridging sleeve 2, spline groove 21, second through hole 22, welding opening 23, driven shaft 3, second flange 31, third through hole 311, second plug pin 32, second spline 321, elastic band 4, connecting rod 5, limit sleeve 51. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0025] Example 1:

[0026] This utility model provides a permanent magnet coupling for use in an air preheater. Please refer to [link / reference]. Figure 1-3 It includes an active rotating shaft 1 and a driven rotating shaft 3. The ends of the active rotating shaft 1 and the driven rotating shaft 3 are jointly fitted with a bridging connecting sleeve 2. An elastic band 4 is welded to the inner wall of the bridging connecting sleeve 2. The ends of the active rotating shaft 1 and the driven rotating shaft 3 are both welded to the elastic band 4.

[0027] The end of the active rotating shaft 1 is integrally provided with a first insertion pin 12, and the end of the driven rotating shaft 3 is integrally provided with a second insertion pin 32. The first insertion pin 12 and the second insertion pin 32 are respectively inserted into the two ends of the bridging connecting sleeve 2, and the bridging connecting sleeve 2 is provided with a welding opening 23.

[0028] Both ends of the bridging sleeve 2 are provided with spline grooves 21. The outer wall of the first insertion pin 12 is integrally provided with a first spline 121, and the outer wall of the second insertion pin 32 is integrally provided with a second spline 321. The first spline 121 and the second spline 321 are respectively located in the spline grooves 21 at both ends of the bridging sleeve 2.

[0029] The first spline 121 and the second spline 321 are both slightly smaller than the spline groove 21, and the diameters of the first insertion pin 12 and the second insertion pin 32 are both slightly smaller than the inner diameter of the bridging sleeve 2.

[0030] The active rotating shaft 1 has an integrally formed first flange 11, and the driven rotating shaft 3 has an integrally formed second flange 31. Both the first flange 11 and the second flange 31 have a gap with the bridging connecting sleeve 2, and the size of the gap is the same as the vibration amplitude when the rotating shaft is working.

[0031] In practical use, the first insertion pin 12 of the active rotating shaft 1 and the second insertion pin 32 of the driven rotating shaft 3 are respectively inserted into the two ends of the bridging connecting sleeve 2, and the first spline 121 and the second spline 321 are respectively slid into the spline grooves 21 at both ends of the bridging connecting sleeve 2, and the first insertion pin 12 and the second insertion pin 32 are welded to the elastic bands 4 at both ends of the bridging connecting sleeve 2.

[0032] Example 2:

[0033] See attached document Figure 4-5 Unlike Embodiment 1, the first flange 11, the bridging connecting sleeve 2, and the second flange 31 are all connected to a connecting rod 5. A limiting sleeve 51 is fitted on the connecting rod 5, and the limiting sleeve 51 and the connecting rod 5 are fixed together by bolts. The connecting rod 5 is used to reinforce the relationship between the driving shaft 1 and the driven shaft 3.

[0034] The first flange 11, the bridging sleeve 2, and the second flange 31 are respectively provided with a first through hole 111, a second through hole 22, and a third through hole 311.

[0035] In practical use, the first insertion pin 12 of the active rotating shaft 1 and the second insertion pin 32 of the driven rotating shaft 3 are respectively inserted into the two ends of the bridging connecting sleeve 2, and the first spline 121 and the second spline 321 are respectively slid into the spline grooves 21 at both ends of the bridging connecting sleeve 2, and the first insertion pin 12 and the second insertion pin 32 are welded to the elastic bands 4 at both ends of the bridging connecting sleeve 2.

[0036] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A permanent magnet coupling for use in an air preheater, comprising a driving shaft (1) and a driven shaft (3), wherein the ends of the driving shaft (1) and the driven shaft (3) are jointly fitted with a bridging connecting sleeve (2), characterized in that: An elastic band (4) is welded to the inner wall of the bridging sleeve (2), and the ends of the active rotating shaft (1) and the driven rotating shaft (3) are welded to the elastic band (4).

2. The permanent magnet coupling used in an air preheater according to claim 1, characterized in that, The end of the active rotating shaft (1) has an integral first insertion pin (12), and the end of the driven rotating shaft (3) has an integral second insertion pin (32). The first insertion pin (12) and the second insertion pin (32) are respectively inserted into the two ends of the bridging connecting sleeve (2).

3. The permanent magnet coupling used in an air preheater according to claim 2, characterized in that, Both ends of the bridging sleeve (2) are provided with spline grooves (21). The outer wall of the first insertion pin (12) is integrally provided with a first spline (121), and the outer wall of the second insertion pin (32) is integrally provided with a second spline (321). The first spline (121) and the second spline (321) are respectively located in the spline grooves (21) at both ends of the bridging sleeve (2).

4. The permanent magnet coupling used in an air preheater according to claim 3, characterized in that, The first spline (121) and the second spline (321) are both smaller than the spline groove (21), and the diameters of the first pin (12) and the second pin (32) are both slightly smaller than the inner diameter of the bridging sleeve (2).

5. A permanent magnet coupling used in an air preheater according to claim 2, 3, or 4, characterized in that, The active rotating shaft (1) has an integral first flange (11), and the driven rotating shaft (3) has an integral second flange (31). Both the first flange (11) and the second flange (31) have a gap with the bridging connecting sleeve (2).

6. A permanent magnet coupling used in an air preheater according to claim 5, characterized in that, The first flange (11), the bridging sleeve (2), and the second flange (31) are all connected to a connecting rod (5). A limiting sleeve (51) is fitted on the connecting rod (5), and the limiting sleeve (51) and the connecting rod (5) are fixed together by bolts.

7. A permanent magnet coupling used in an air preheater according to claim 6, characterized in that, The first flange (11), the bridging sleeve (2), and the second flange (31) are respectively provided with a first through hole (111), a second through hole (22), and a third through hole (311).

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