Variable frequency converter permanent magnet roller mechanism

Abstract

The utility model discloses a frequency converter permanent -magnetic drum mechanism, including drum main part, rotor, support shaft and stator, the inside central position of drum main part is provided with support shaft, and the both ends of support shaft are connected with drum main part through bearing, the outside of drum main part is provided with support, one side of support is provided with frequency converter main part, the central position of support shaft is provided with stator, the inner wall of drum main part is provided with rotor, the central position of support shaft inside is provided with hollow, and the support shaft in hollow outside is provided with water cavity, the support on one end of hollow is provided with fan, the top of one end of drum main part is connected with fan through connecting piece. The utility model discloses through being installed drum main part, frequency converter main part, support shaft, stator, rotor, hollow, water cavity and fan, utilize the heat dissipation system high -efficient cooling of water cooling plus self -driven air -cooled, and the reliability and service life of equipment are promoted.

Description

Technical Field

[0001] This utility model relates to the field of roller mechanism technology, specifically a permanent magnet roller mechanism for a frequency converter. Background Technology

[0002] As an important transmission component, rollers are widely used in mining and other industries for conveying materials or transmitting power. With the increasing emphasis on energy conservation and environmental protection, traditional roller mechanisms have gradually revealed their shortcomings in terms of energy consumption and efficiency, leading to the development of variable frequency drive permanent magnet roller mechanisms.

[0003] The variable frequency drive (VFD) permanent magnet drum mechanism is a power transmission device that integrates a permanent magnet drum and a variable frequency control system. It is mainly used for driving equipment such as belt conveyors. Its core feature is to utilize the high efficiency and energy-saving characteristics of permanent magnet motors, combined with the speed regulation function of the VFD, to achieve stable operation, precise speed regulation, and energy consumption optimization of the conveying system. In order to dissipate heat from the permanent magnet components inside the drum, heat dissipation fins are usually installed on the inner wall or end of the drum shell. The centrifugal force of the drum rotation forces airflow, but the heat dissipation effect is poor. Utility Model Content

[0004] The purpose of this invention is to provide a permanent magnet roller mechanism for a frequency converter to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a permanent magnet drum mechanism for a frequency converter, comprising a drum body, a rotor, a support shaft, and a stator. A support shaft is located at the center of the drum body, and both ends of the support shaft are connected to the drum body via bearings. A bracket is located on the outer side of the drum body, and both ends of the bracket are connected to the support shaft. A frequency converter body is located on one side of the bracket. A stator is located at the center of the support shaft. A rotor is located on the inner wall of the drum body. A hollow portion is located at the center of the support shaft, and a water cavity is located inside the support shaft outside the hollow portion. A fan is located on the bracket at one end of the hollow portion, and the top of one end of the drum body is connected to the fan via a connector.

[0006] As a further technical solution of this utility model, a cold water pipe is provided inside the water cavity, and the cold water pipe is wrapped around the outside of the hollow part in a "snake" shape, and thermal conductive silicone grease is provided on the outside of the support shaft.

[0007] As a further technical solution of this utility model, the two ends of the support shaft are respectively provided with a water inlet and a water outlet, and the water inlet and the water outlet are respectively connected to the two ends of the cold water pipe.

[0008] As a further technical solution of this utility model, end caps are respectively provided at both ends of the roller body, and a reserved groove is provided inside the end cap. A sealing ring is provided at one end of the reserved groove near the support shaft, and the sealing ring is made of graphite.

[0009] As a further technical solution of this utility model, both ends of the reserved groove are provided with elastic bodies, and one end of each elastic body is connected to a sealing ring. The elastic bodies are all made of rubber.

[0010] As a further technical solution of this utility model, guide blocks are provided on both sides of the elastic body, and guide grooves matching the guide blocks are uniformly opened on the inner wall of the reserved groove.

[0011] As a further technical solution of this utility model, a frustum is provided at the center of the fan, and blades are evenly distributed on the outer side of the frustum. One end of the connector is connected to the frustum.

[0012] As a further technical solution of this utility model, a substrate is provided at the center of the inner wall of the roller body, and the substrate is made of high-strength alloy material. An inner layer is provided on the inner side of the substrate, and the inner layer is made of carbon fiber composite material. An outer layer is provided on the outer side of the substrate, and the outer layer is made of wear-resistant ceramic coating.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This inverter permanent magnet roller mechanism consists of a roller body, an inverter body, a support shaft, a stator, a rotor, a hollow section, a water cavity, a cooling water pipe, a fan, a frustum, blades, and connecting parts. The three-phase AC power output from the inverter body is fed into the stator inside the roller body, generating a rotating magnetic field. The rotor inside the roller body rotates synchronously under the action of the rotating magnetic field. The rotor is rigidly connected to the outer shell of the roller body, and its rotation directly drives the roller body to rotate, thereby driving the conveyor belt to run and realizing material conveying. A hollow section is provided at the central position inside the support shaft. A water cavity is set on the outside of the hollow section, and a cold water pipe is set inside the water cavity. Cold water is introduced into the cold water pipe and exchanges heat with the heat generated by the stator during the flow process, directly cooling the stator (the core of the heat source) and rapidly reducing the stator temperature. A fan is set on the support at the end of the hollow section. One end of the roller body is connected to the fan through a connector. The fan is driven to rotate during the rotation of the roller body. The fan forms a forced airflow at the end of the support shaft, which carries away the heat that the water cooling cannot completely dissipate through the hollow section and accelerates the heat exchange between the surface of the support shaft and the outside. Moreover, no additional electricity or hydraulic drive is required, which reduces the risk of explosion caused by electric sparks. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a frontal cross-sectional view of the present invention.

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the support shaft of this utility model;

[0017] Figure 3 This is a side view of the structure of this utility model;

[0018] Figure 4 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0019] Figure 5 This is a schematic diagram of the cross-sectional structure of the side wall of the main body of the roller according to this utility model.

[0020] In the diagram: 1. Roller body; 2. Rotor; 3. Support shaft; 4. Stator; 5. End cover; 6. Inverter body; 7. Bracket; 8. Connector; 9. Fan; 10. Hollow section; 11. Water cavity; 12. Cold water pipe; 13. Thermal grease; 14. Water inlet; 15. Water outlet; 16. Frustum; 17. Blade; 18. Reserved groove; 19. Elastomer; 20. Sealing ring; 21. Guide groove; 22. Guide block; 23. Substrate; 24. Outer layer; 25. Inner layer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] Please see Figure 1-5 An embodiment of this utility model is provided: a permanent magnet roller mechanism for a frequency converter, including a roller body 1, a rotor 2, a support shaft 3 and a stator 4. The support shaft 3 is provided at the center of the inside of the roller body 1, and both ends of the support shaft 3 are connected to the roller body 1 through bearings. A bracket 7 is provided on the outside of the roller body 1, and both ends of the bracket 7 are connected to the support shaft 3.

[0023] A frequency converter body 6 is provided on one side of the bracket 7, a stator 4 is provided at the center of the support shaft 3, and a rotor 2 is provided on the inner wall of the drum body 1.

[0024] The inverter body 6 converts the power grid frequency AC power into adjustable frequency three-phase AC power and outputs it to the winding of the stator 4. After the stator 4 winding is energized, it generates a rotating magnetic field. Its speed is determined by the output frequency of the inverter body 6. Under the action of the rotating magnetic field, the rotor 2 on the inner wall of the drum body 1 rotates synchronously with the magnetic field due to the magnetic pull. The rotor 2 is rigidly connected to the drum body 1, which drives the drum body 1 to rotate synchronously and drives the external conveyor belt to run, thereby realizing material transportation.

[0025] The roller body 1 is provided with end caps 5 at both ends, and each end cap 5 has a reserved groove 18 inside. Each reserved groove 18 has a sealing ring 20 at one end near the support shaft 3, and the sealing ring 20 is made of graphite.

[0026] The sealing ring 20 is in close contact with the support shaft 3 to prevent dust and moisture from entering. At the same time, when the friction temperature is too high, the sealing ring 20 will release interlayer graphite microcrystals to form a solid lubricating film, thereby reducing the coefficient of friction.

[0027] Both ends of the reserved groove 18 are provided with elastomers 19, and one end of each elastomer 19 is connected to the sealing ring 20. The elastomers 19 are all made of rubber. The rubber elastomers 19 provide axial preload to compensate for the wear of the sealing ring 20 and ensure long-term sealing performance.

[0028] Guide blocks 22 are provided on both sides of the elastomer 19, and guide grooves 21 matching the guide blocks 22 are evenly opened on the inner wall of the reserved groove 18. The guide blocks 22 and guide grooves 21 cooperate to make the sealing ring 20 less likely to deviate when it moves axially.

[0029] A hollow section 10 is provided at the center of the support shaft 3. Both ends of the hollow section 10 are provided with filters to prevent dust and impurities from entering the interior. A water cavity 11 is provided inside the support shaft 3 outside the hollow section 10. A cold water pipe 12 is provided inside the water cavity 11, and the cold water pipe 12 is wrapped around the outside of the hollow section 10 in a "snake" shape. Thermal grease 13 is provided on the outside of the support shaft 3.

[0030] The support shaft 3 is provided with an inlet 14 and an outlet 15 at both ends, and the inlet 14 and the outlet 15 are respectively connected to the two ends of the cold water pipe 12.

[0031] Cold water enters the cold water pipe 12 inside the support shaft 3 from the inlet 14. The cold water pipe 12 is wrapped around the outside of the hollow part 10 in a "snake shape". It conducts heat efficiently with the stator 4 through the thermal grease 13. After absorbing the heat of the stator 4, the cooling water flows out from the outlet 15, forming a closed loop. The water cooling system directly cools the heat source core of the stator 4, causing the temperature of the stator 4 to drop rapidly.

[0032] A fan 9 is installed on the support 7 at one end of the hollow part 10. The top of one end of the roller body 1 is connected to the fan 9 through the connector 8. A frustum 16 is installed at the center of the fan 9. Blades 17 are evenly distributed on the outer side of the frustum 16. One end of the connector 8 is connected to the frustum 16.

[0033] When the drum body 1 rotates, the connecting piece 8 drives the truncated cone 16 of the fan 9 to rotate synchronously. The blades 17 on the outer side of the truncated cone 16 form a forced airflow, which draws in air from one end of the hollow part 10 of the support shaft 3. The airflow flows through the hollow part 10, carrying away the residual heat that has not been dissipated by the water cooling and accelerating the heat dissipation of the surface of the support shaft 3.

[0034] The system utilizes a water-cooling and self-driven air-cooling heat dissipation system for efficient cooling. Combined with optimized sealing structure and materials, it significantly improves the reliability and service life of the equipment in harsh environments such as underground coal mines.

[0035] A base material 23 is provided at the center of the inner wall of the roller body 1, and the base material 23 is made of high-strength alloy material to ensure sufficient wear resistance and structural strength.

[0036] The inner side of the substrate 23 is provided with an inner layer 25, and the inner layer 25 is a carbon fiber composite material, which has the characteristics of light weight and high strength, which can reduce the weight of the roller body 1 and improve its fatigue resistance.

[0037] The outer layer 24 is provided on the outer side of the substrate 23, and the outer layer 24 is made of wear-resistant ceramic coating, which has extremely high hardness and wear resistance, and can significantly improve the wear resistance of the roller body 1, especially suitable for conveying materials with hard particles.

[0038] The specific model and specifications of the inverter body 6 need to be determined by selection calculation based on the specifications and parameters of the device. The selection calculation method is existing technology, so it will not be described in detail here.

[0039] Working Principle: In this embodiment, the inverter body 6 converts the mains AC power from the grid into adjustable three-phase AC power, which is output to the windings of the stator 4. The stator 4 windings generate a rotating magnetic field when energized, and its rotational speed is determined by the output frequency of the inverter body 6. Under the influence of the rotating magnetic field, the rotor 2 on the inner wall of the drum body 1 rotates synchronously with the magnetic field due to magnetic pull. The rotor 2 is rigidly connected to the drum body 1, driving the drum body 1 to rotate synchronously, thus driving the external conveyor belt to transport materials. Cold water enters the cold water pipe 12 inside the support shaft 3 from the inlet 14. The cold water pipe 12 is serpentine in shape. Wrapped around the outside of the hollow section 10, it efficiently conducts heat with the stator 4 through the thermally conductive silicone grease 13. After absorbing the heat from the stator 4, the cooling water flows out from the outlet 15, forming a closed-loop circulation. The water cooling system directly cools the core heat source of the stator 4, causing the temperature of the stator 4 to drop rapidly. At the same time, when the drum body 1 rotates, it drives the frustum 16 of the fan 9 to rotate synchronously through the connector 8. The blades 17 on the outside of the frustum 16 form a forced airflow, drawing air in from one end of the hollow section 10 of the support shaft 3. The airflow flows through the hollow section 10, carrying away the residual heat from the water cooling and accelerating the heat dissipation on the surface of the support shaft 3. The synergy of air cooling and water cooling improves the cooling effect. End cover A graphite sealing ring 20 is installed in the reserved groove 18 of the 5, which is in close contact with the support shaft 3 to prevent dust and moisture from entering. At the same time, when the friction temperature is too high, the sealing ring 20 will release interlayer graphite microcrystals to form a solid lubricating film, thereby reducing the friction coefficient. The rubber elastomer 19 provides axial preload to compensate for the wear of the sealing ring 20 and ensure long-term sealing. The guide block 22 cooperates with the guide groove 21 to ensure that the sealing ring 20 does not deviate when moving axially. The heat dissipation system of water cooling plus self-driven air cooling is used for efficient cooling. Combined with the optimization of sealing structure and materials, the reliability and service life of the equipment in harsh environments such as underground coal mines are significantly improved.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A permanent magnet roller mechanism for a frequency converter, characterized in that, The device includes a drum body (1), a rotor (2), a support shaft (3), and a stator (4). The support shaft (3) is located at the center of the drum body (1), and both ends of the support shaft (3) are connected to the drum body (1) via bearings. A bracket (7) is located on the outside of the drum body (1), and both ends of the bracket (7) are connected to the support shaft (3). A frequency converter body (6) is located on one side of the bracket (7). The stator (4) is located at the center of the support shaft (3). The rotor (2) is located on the inner wall of the drum body (1). A hollow part (10) is located at the center of the support shaft (3), and a water cavity (11) is located inside the support shaft (3) outside the hollow part (10). A fan (9) is located on the bracket (7) at one end of the hollow part (10), and the top of one end of the drum body (1) is connected to the fan (9) via a connector (8).

2. The inverter permanent magnet roller mechanism according to claim 1, characterized in that: The water cavity (11) is provided with a cold water pipe (12), and the cold water pipe (12) is wrapped around the outside of the hollow part (10) in a "snake" shape. Thermal grease (13) is provided on the outside of the support shaft (3).

3. The inverter permanent magnet drum mechanism according to claim 2, characterized in that: The support shaft (3) has an inlet (14) and an outlet (15) at its two ends, and the inlet (14) and outlet (15) are respectively connected to the two ends of the cold water pipe (12).

4. The inverter permanent magnet roller mechanism according to claim 1, characterized in that: The roller body (1) is provided with end caps (5) at both ends, and each end cap (5) has a reserved groove (18) inside. Each reserved groove (18) has a sealing ring (20) at one end near the support shaft (3), and the sealing ring (20) is made of graphite.

5. A frequency converter permanent magnet roller mechanism according to claim 4, characterized in that: Both ends of the reserved groove (18) are provided with an elastomer (19), and one end of the elastomer (19) is connected to the sealing ring (20). The elastomer (19) is made of rubber.

6. A permanent magnet roller mechanism for a frequency converter according to claim 5, characterized in that: Guide blocks (22) are provided on both sides of the elastomer (19), and guide grooves (21) matching the guide blocks (22) are evenly opened on the inner wall of the reserved groove (18).

7. A frequency converter permanent magnet roller mechanism according to claim 1, characterized in that: A frustum (16) is provided at the center of the fan (9), and blades (17) are evenly distributed on the outer side of the frustum (16). One end of the connector (8) is connected to the frustum (16).

8. A frequency converter permanent magnet drum mechanism according to claim 1, characterized in that: A substrate (23) is provided at the center of the inner wall of the roller body (1), and the substrate (23) is made of high-strength alloy material. An inner layer (25) is provided on the inner side of the substrate (23), and the inner layer (25) is made of carbon fiber composite material. An outer layer (24) is provided on the outer side of the substrate (23), and the outer layer (24) is made of wear-resistant ceramic coating.

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