Self-cooling type permanent magnet coupler

Abstract

The invention discloses a self-cooling type permanent magnet coupler which comprises a permanent magnet coupler input part, a permanent magnet coupler output part and a self-cooling structure. The permanent magnet coupler input part comprises a conductor wheel and an impeller, the conductor wheel comprises an input side hub, a transmission disc, an outer steel ring and an inner steel ring, and the impeller and the conductor wheel are rigidly connected into a whole and are connected with a driving shaft through the input side hub at the driving end; the permanent magnet coupler output part comprises a magnet wheel, permanent magnets and an output side hub, and the permanent magnets are evenly distributed in magnet grooves of the magnet wheel. The self-cooling structure is composed of a conductor wheel outer cooling structure, a conductor wheel inner cooling structure and an impeller exhaust cooling structure. The impeller rotates to suck cold air into the cooling structure, and the inner and outer arc-shaped copper plates generating heat and the permanent magnets on the magnet wheel are cooled. The influence of temperature on the permanent magnet is effectively reduced, the utilization rate of the permanent magnet is improved, the comprehensive performance of the permanent magnet coupler is improved, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of transmissions in mechanical engineering, and particularly to a self-cooling permanent magnet coupling. Background Art

[0002] Currently, the existing known permanent magnet couplings all use heat sinks for heat dissipation. This heat dissipation structure has no major problems when applied to ordinary disc couplings, but for cylindrical permanent magnet couplings, the heat dissipation effect is not so significant, which will cause problems such as an increase in equipment temperature, a significant reduction in magnetic energy utilization rate and the efficiency of the permanent magnet coupling, and even the phenomenon of burnout of the permanent magnet coupling. The self-cooling permanent magnet coupling of the present application can well solve the heat dissipation problem, improve the magnetic energy utilization rate, and enhance the comprehensive performance of the permanent magnet coupling. Summary of the Invention

[0003] The purpose of the present invention is to provide a self-cooling permanent magnet coupling, which adopts an integrated heat dissipation structure of the permanent magnet coupling and a heat dissipation impeller, and uses the outer steel ring, inner steel ring, guide cover, and heat sink of the permanent magnet coupling body to form an axial air extraction channel, and sends air into the centrifugal air duct of the impeller to improve the heat dissipation effect and extend the service life of the coupling.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a self-cooling permanent magnet coupling, which includes a permanent magnet coupling input part, a permanent magnet coupling output part, and a permanent magnet coupling self-cooling structure;

[0005] The permanent magnet coupling input part includes a conductor wheel and an impeller. The conductor wheel includes an input-side hub, a transmission disc, an outer steel ring, and an inner steel ring. The input-side hub is connected to the outside of the transmission disc. The outer steel ring and the inner steel ring are connected to the inside of the transmission disc. There is a gap between the outer steel ring and the inner steel ring. A heat dissipation ring is machined on the outer circumference of the outer steel ring, and segmented outer arc-shaped copper plates are installed on the inner circumference of the outer steel ring. Segmented inner arc-shaped copper plates are installed on the outer circumference of the inner steel ring. The impeller and the conductor wheel are rigidly connected into one body, and both are connected through the input-side hub and the drive shaft at the drive end;

[0006] The permanent magnet coupling output part includes a magnet wheel, permanent magnets, and an output-side hub. The permanent magnets are evenly distributed in the magnet slots of the magnet wheel. The magnet slots of the magnet wheel are located in the gap between the outer steel ring and the inner steel ring;

[0007] The self-cooling structure of the permanent magnet coupling consists of an outer cooling structure of the conductor wheel, an inner cooling structure of the conductor wheel, and an impeller exhaust cooling structure; the outer cooling structure of the conductor wheel consists of a heat dissipation ring provided on the outer circumference of the outer steel ring; the inner cooling structure of the conductor wheel consists of a trapezoidal horn-shaped air inlet on the side spoke of the magnet wheel, an outer arc-shaped copper plate on the outer steel ring, an inner arc-shaped copper plate on the inner steel ring, heat dissipation fins on the inner conical hole surface of the inner steel ring, and an air inlet provided on the upper part of the driving disc; the impeller exhaust cooling structure consists of a driving disc and an impeller mounted on the driving disc;

[0008] When the driving shaft rotates, it drives the conductor wheel to rotate. The arc-shaped copper plate on the conductor wheel cuts the magnetic force lines in the magnetic field formed by the magnet wheel, induces eddy current and generates magnetic coupling with the magnet wheel, and transmits the input torque to the load shaft, thereby driving the equipment to operate; at the same time, the permanent magnet coupling drives the impeller to rotate synchronously through the driving disc. The impeller sucks cold air into the inner cooling structure, and the inner cooling structure and the heat dissipation ring on the outer cooling structure work together to cool the inner and outer arc-shaped copper plates and the permanent magnets on the magnet wheel that generate heat, and discharge the heat in the inner cooling structure to the outside air through the impeller.

[0009] Further, the inner circle of the inner steel ring is a conical surface, and heat dissipation fins are welded thereon. The heat dissipation fins form a certain angle with the axis of the inner steel ring to increase the axial air extraction volume.

[0010] Further, a flow guide cover (9) is installed at the part of the driving disc close to the heat dissipation fins (8) of the inner steel ring to form an inner steel ring heat dissipation structure, which helps to introduce air into the air duct.

[0011] Furthermore, an air outlet is opened on the end face of the driving disc (2), and a corresponding air inlet is opened on the end face of the magnet wheel (5) coupled therewith. The air inlet and the air outlet form an air duct with the inner steel ring heat dissipation structure. As the permanent magnet coupling rotates, the heat dissipation structure of the inner steel ring performs axial air extraction and sends it into the impeller centrifugal air duct.

[0012] Furthermore, a flow guide plate (15) with an inclination angle is installed on the side of the air inlet of the magnet wheel (5). When the magnet wheel rotates, it guides the air into the air inlet of the magnet wheel to facilitate the rapid entry of cold air into the cooling channel.

[0013] Furthermore, the air inlet, the gaps between the inner and outer arc surfaces of the magnet wheel ring and the arc-shaped copper plates on the inner and outer steel rings of the conductor wheel, and the air outlet also form a heat dissipation air duct.

[0014] Further, it is characterized in that the impeller exhaust cooling structure consists of a driving disc (2) and an impeller mounted thereon. The impeller includes a front disc (10), blades (11) and a rear disc (12), and forms a radial centrifugal exhaust air channel. When the permanent magnet coupling rotates at a high speed, it drives the impeller to rotate, introduces the hot air in the inner cooling structure of the conductor wheel into the centrifugal air duct, and discharges it radially.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) It effectively reduces the influence of temperature on the permanent magnet, improves the utilization rate of the permanent magnet, and enhances the comprehensive performance and service life of the permanent magnet coupling;

[0017] (2) The heat dissipation structure is novel and the heat dissipation effect is remarkable.

[0018] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a self-cooling permanent magnet coupling.

[0020] Figure 2 It is a schematic cross-sectional view of the input part of a self-cooling permanent magnet coupling.

[0021] Figure 3 It is a schematic cross-sectional view of the output part of a self-cooling permanent magnet coupling.

[0022] Figure 4 It is a schematic plan view of the impeller of a self-cooling permanent magnet coupling.

[0023] Figure 5 It is a schematic plan view of the driving disc of a self-cooling permanent magnet coupling.

[0024] Figure 6 It is a schematic plan view of the magnet wheel of a self-cooling permanent magnet coupling.

[0025] Figure 7 It is a schematic diagram of the air path of a self-cooling permanent magnet coupling.

[0026] The labels in the figure are: 1 - input side hub, 2 - driving disc, 3 - outer steel ring, 4 - inner steel ring, 5 - magnet wheel, 6 - outer arc-shaped copper plate, 7 - inner arc-shaped copper plate, 8 - heat sink, 9 - flow guide cover, 10 - front disc, 11 - blade, 12 - rear disc, 13 - permanent magnet, 14 - output side hub, 15 - inclined flow guide plate, 16 - air outlet, 17 - air inlet. DETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0028] As Figures 1 to 7 shown, a self-cooling permanent magnet coupling includes an input part of the permanent magnet coupling, an output part of the permanent magnet coupling, and a self-cooling structure of the permanent magnet coupling.

[0029] The input part of the permanent magnet coupling includes a conductor wheel and an impeller. The conductor wheel includes an input-side hub 1, a transmission disk 2, an outer steel ring 3 and an inner steel ring 4. The input-side hub 1 is connected to the outside of the transmission disk 2. The outer steel ring 3 and the inner steel ring 4 are connected to the inside of the transmission disk 2. There is a gap between the outer steel ring 3 and the inner steel ring 4. A heat dissipation ring is machined on the outer circle of the outer steel ring 3. Outer arc-shaped copper plates 6 divided into several segments are installed on the inner circle of the outer steel ring 3. Inner arc-shaped copper plates 7 divided into several segments are installed on the outer circle of the inner steel ring 4. The impeller and the conductor wheel are rigidly connected as a whole, and both are connected through the input-side hub 1 at the driving end and the driving shaft.

[0030] The output part of the permanent magnet coupling includes a magnet wheel 5, permanent magnets 13 and an output-side hub 14. The permanent magnets 13 are evenly distributed in the magnet slots of the magnet wheel 5. The magnet slots of the magnet wheel 5 are located in the gap between the outer steel ring 3 and the inner steel ring 4.

[0031] The self-cooling structure of the permanent magnet coupling consists of an outer cooling structure of the conductor wheel, an inner cooling structure of the conductor wheel and an impeller exhaust cooling structure. The outer cooling structure of the conductor wheel consists of a heat dissipation ring provided on the outer circle of the outer steel ring 4. The inner cooling structure of the conductor wheel consists of a trapezoidal trumpet-shaped air inlet on the side spoke of the magnet wheel 5, the outer arc-shaped copper plates 6 on the outer steel ring 3, the inner arc-shaped copper plates 7 on the inner steel ring 4, the heat dissipation fins 8 on the inner conical hole surface of the inner steel ring, and the air inlet opened on the transmission disk 2. The impeller exhaust cooling structure consists of a transmission disk and an impeller installed on the transmission disk.

[0032] When the driving shaft rotates, it drives the conductor wheel to rotate. The arc-shaped copper plates on the conductor wheel make a movement of cutting magnetic induction lines in the magnetic field formed by the magnet wheel, inducing eddy currents and generating magnetic coupling with the magnet wheel, transmitting the input torque to the load shaft, thereby driving the equipment to operate. At the same time, the permanent magnet coupling drives the impeller to rotate synchronously through the transmission disk. The impeller sucks cold air into the inner cooling structure. The inner cooling structure and the heat dissipation ring on the outer cooling structure work together to cool the inner and outer arc-shaped copper plates generating heat and the permanent magnets on the magnet wheel, and discharge the heat in the inner cooling structure to the outside air through the impeller. The material of the permanent magnets 13 is mainly neodymium iron boron in high-performance rare earth alloys. The material of the magnet wheel 5 is mainly non-magnetized material aluminum. The arc-shaped copper plates are mainly made of non-magnetized material copper. Its steel disk material is made of magnetizable steel.

[0033] In this embodiment, the inner circle of the inner steel ring 4 is a conical surface, and heat dissipation fins (8) are welded thereon. The heat dissipation fins (8) form a certain angle with the axis of the inner steel ring, which is used to increase the axial air extraction volume.

[0034] In this embodiment, a flow guide cover (9) is installed near the inner steel ring fin 8 of the drive disk to form an inner steel ring heat dissipation structure, which helps to introduce air into the air duct. An air outlet is provided on the end face of the drive disk 2, and a corresponding air inlet is provided on the end face of the magnet wheel 5 coupled thereto. The air inlet and the air outlet form an air duct with the inner steel ring heat dissipation structure. As the permanent magnet coupling rotates, the heat dissipation structure of the inner steel ring performs axial air extraction and sends it into the impeller centrifugal air duct. A deflector plate 15 with an inclination angle is installed on the side of the air inlet of the magnet wheel). When the magnet wheel rotates, it guides air into the air inlet of the magnet wheel to facilitate the rapid entry of cold air into the cooling channel. At the same time, the air inlet, the gaps between the inner and outer arc surfaces of the magnet wheel ring and the arc-shaped copper plates on the inner and outer steel rings of the conductor wheel, and the air outlet also form a heat dissipation air duct.

[0035] In this embodiment, the impeller exhaust cooling structure is composed of a drive disk 2 and an impeller installed thereon. The impeller includes a front disk 10, blades 11 and a rear disk 12, and forms a radial centrifugal exhaust channel. When the permanent magnet coupling rotates at a high speed, it drives the impeller to rotate, introduces the hot air in the inner cooling structure of the conductor wheel into the centrifugal air duct, and discharges it radially.

[0036] Working principle of this self-cooling permanent magnet coupling: When starting, power is provided by the motor to drive the conductor wheel to rotate. Under the magnetic field coupling effect between the conductor wheel and the magnet wheel, the magnet wheel is driven to rotate. The magnet wheel provides the torque required for the load operation. During the process of the permanent magnet coupling transmitting torque, some heat will be released. To ensure the heat dissipation effect of the cylindrical coupling, an external air cooling and two internal air cooling structures are designed. First, a heat dissipation ring is designed on the outer steel ring surface of the conductor wheel. By increasing its contact area with the air, air cooling dissipation is carried out during the rotation of the permanent magnet coupling. Secondly, gaps are left between the inner and outer steel rings and the magnet wheel. One is to ensure that the inner and outer steel rings and the magnet wheel do not interfere with each other during magnetic field coupling, and transmit the torque on the conductor wheel to the magnet wheel through the magnetic field, and then to the load shaft. The other is to serve as a heat dissipation air duct to dissipate heat from the arc-shaped copper plate that generates heat sources. Under the action of the centrifugal force of the rotating impeller, cold air enters the heat dissipation channel from the inner and outer arc side surfaces of the magnet wheel and is discharged radially through the impeller, thereby dissipating heat from the inner and outer arc-shaped copper plates. Heat dissipation fins are welded on the inner conical surface of the inner steel ring. The heat dissipation fins form a certain angle with the inner steel ring, which can increase the axial air extraction volume and help quickly take away the heat generated by the arc-shaped copper plate, playing a role in heat dissipation. A flow guide cover is installed near the heat dissipation fins of the inner steel ring. Together with the inner conical surface and the heat dissipation fins of the inner steel ring, it forms an inner steel ring heat dissipation structure, which helps to introduce cold air into the air duct. An air inlet is opened on the side of the driving disc, and a corresponding air inlet is also opened on the side of the magnet wheel. A flow guide plate with an inclination angle is installed on the side of the air inlet, which can quickly introduce the air around the air inlet into the air inlet and jointly form a heat dissipation air duct with the inner steel ring heat dissipation structure. As the permanent magnet coupling rotates, the heat dissipation structure of the inner steel ring conducts axial air extraction and quickly sends it into the impeller centrifugal air duct. The impeller is designed with a front disc, blades and a rear disc, which jointly form a radial centrifugal exhaust air channel to introduce the air extracted by the internal cooling structure into the centrifugal air duct and discharge it radially. Under the combined action of the internal and external air cooling structures, the permanent magnet coupling conducts self-cooling and achieves the self-cooling heat dissipation effect.

[0037] The above has shown and described the basic principle, main features and advantages of the present invention. Those of ordinary skill in the art should understand that the above embodiments do not limit the protection scope of the present invention in any form. Any technical solutions obtained by means of equivalent replacement and the like all fall within the protection scope of the present invention.

Claims

1. A self-cooling permanent magnetic coupling, characterized in that: It includes a permanent magnetic coupling input part, a permanent magnetic coupling output part and a permanent magnetic coupling self-cooling structure; The input part of the permanent magnet coupling comprises a conductor wheel and an impeller, wherein the conductor wheel comprises an input side hub (1), a transmission disc (2), an outer steel ring (3) and an inner steel ring (4), wherein the input side hub (1) is connected to the outer side of the transmission disc (2), the outer steel ring (3) and the inner steel ring (4) are connected to the inner side of the transmission disc (2), a gap is left between the outer steel ring (3) and the inner steel ring (4), a heat dissipation ring is processed on the outer circle of the outer steel ring (3), an outer arc-shaped copper plate (6) divided into several sections is installed on the inner circle of the outer steel ring (3), and an inner arc-shaped copper plate (7) divided into several sections is installed on the outer circle of the inner steel ring (4); the impeller and the conductor wheel are rigidly connected to form a whole, and the two are connected to the drive shaft through the input side hub (1) at the drive end; The output part of the permanent magnetic coupling comprises a magnet wheel (5), permanent magnets (13) and an output side hub (14), wherein the permanent magnets (13) are evenly distributed in magnet slots of the magnet wheel (5), and the magnet slots of the magnet wheel (5) are located in the gap between the outer steel ring (3) and the inner steel ring (4); The permanent magnet coupling self-cooling structure is composed of a conductor wheel outer cooling structure, a conductor wheel inner cooling structure and an impeller exhaust cooling structure; the conductor wheel outer cooling structure is composed of a heat dissipation ring arranged on the outer circle of an outer steel ring (4); the conductor wheel inner cooling junction is composed of a trapezoidal trumpet-shaped air inlet on the side spokes of the magnet wheel (5), an outer arc-shaped copper plate (6) on the outer steel ring (3), an inner arc-shaped copper plate (7) on the inner steel ring (4), a heat sink (8) on the inner conical hole surface of the inner steel ring, and an upper air inlet opened on the transmission disk (2); the impeller exhaust cooling structure is composed of a transmission disk and an impeller mounted on the transmission disk; When the drive shaft rotates, it drives the conductor wheel to rotate. The arc-shaped copper plate on the conductor wheel cuts the magnetic lines of force in the magnetic field formed by the magnet wheel, inducing eddy currents and generating magnetic coupling with the magnet wheel, transferring the input torque to the load shaft, thereby driving the equipment to operate. At the same time, the permanent magnet coupling drives the impeller to rotate synchronously through the transmission disc. The impeller draws cold air into the inner cooling structure. The inner cooling structure works together with the heat dissipation ring on the outer cooling structure to cool the inner and outer arc-shaped copper plates that generate heat and the permanent magnets on the magnet wheel, and discharges the heat in the inner cooling structure into the air through the impeller.

2. A self-cooling permanent magnetic coupling according to claim 1, characterized in that: The inner circle of the inner steel ring (4) is a conical surface, on which a heat sink (8) is welded. The heat sink (8) forms a certain angle with the axis of the inner steel ring to increase the axial air extraction volume.

3. A self-cooling permanent magnetic coupling according to claim 1, characterized in that: The transmission disc is provided with a deflector (9) near the inner steel ring heat sink (8), forming an inner steel ring heat dissipation structure, which helps to guide air into the air duct.

4. A self-cooling permanent magnetic coupling according to claim 3, characterized in that: The end surface of the transmission disc (2) is provided with an air outlet, and the end surface of the magnet wheel (5) coupled thereto is provided with a corresponding air inlet. The air inlet and the air outlet form an air duct with the inner steel ring heat dissipation structure. As the permanent magnet coupling rotates, the heat dissipation structure of the inner steel ring performs axial air extraction and sends the air into the impeller centrifugal air duct.

5. A self-cooling permanent magnetic coupling according to claim 4, characterized in that: The side of the air inlet of the magnet wheel (5) is provided with an inclined guide plate (15) to guide air into the air inlet of the magnet wheel when the magnet wheel rotates, so as to facilitate the cold air to quickly enter the cooling channel.

6. A self-cooling permanent magnetic coupling according to claim 4, characterized in that: The air inlet, the gap between the inner and outer arc surfaces of the magnet wheel ring and the arc-shaped copper plates on the inner and outer steel rings of the conductor wheel, and the air outlet also form a heat dissipation duct.

7. The self-cooling permanent magnetic coupling impeller exhaust cooling structure according to claim 1, characterized in that: The impeller exhaust cooling structure is composed of a transmission disk (2) and an impeller mounted thereon. The impeller comprises a front disk (10), blades (11) and a rear disk (12), and forms a radial centrifugal exhaust passage. When the permanent magnetic coupling rotates at a high speed, the impeller is driven to rotate, and the hot air in the cooling structure inside the conductor wheel is introduced into the centrifugal air passage and discharged radially.

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