CN217087690U - Air-cooled explosion-proof permanent magnet direct-drive roller structure - Google Patents

Abstract

An air-cooled flame-proof type permanent magnet direct-drive roller structure belongs to the technical field of permanent magnet motors. The air-cooled flame-proof type permanent magnet direct-drive roller structure comprises an air duct, wherein the air duct comprises a cylinder and an axial ventilation disc fixedly arranged on the inner wall of the cylinder, an air inlet hole is formed in the end face of one end of the cylinder, an air guide hole is formed in the axial ventilation disc, a plurality of heat dissipation ribs are arranged on the inner wall of the cylinder, a stator shaft is fixedly arranged on the inner side of the air duct, an in-shaft main ventilation hole and an in-shaft branch ventilation hole are formed in the stator shaft, a stator core is fixedly arranged on the outer side of the air duct, a stator coil is arranged on the stator core, a rotor sleeve is further arranged on the outer side of the air duct, an end cover is fixedly arranged at the end of the rotor sleeve, the end cover is rotatably connected with the air duct through a rolling bearing, and magnetic steel is fixedly arranged on the inner wall of the rotor sleeve. The air-cooled explosion-proof permanent magnet direct-drive roller structure can improve the heat dissipation efficiency, enhance the structural reliability, save the space, reduce the cost and has a good explosion-proof effect.

Description

An air-cooled flameproof permanent magnet direct drive drum structure

technical field

The utility model relates to the technical field of permanent magnet motors, in particular to an air-cooled explosion-proof permanent magnet direct drive drum structure.

Background technique

The permanent magnet direct drive drum is a power transmission component that combines the functions of the motor and the reducer in the driving drum of the belt conveyor. It is characterized by small size, compact structure, low cost, convenient use, stable operation and reliable work. , suitable for operation in a variety of harsh environmental conditions.

Permanent magnet direct drive drum motor, the drum shaft is fixed, which is equivalent to the stator part of the motor. The stator core is laminated and fixed on the shaft by silicon steel sheets, and the stator winding is embedded in it. When the stator winding passes through three-phase symmetrical alternating current, a rotating magnetic field can be generated. . The drum surface is equivalent to the rotor part of the motor. The permanent magnet is attached to the inner surface of the drum, which will generate a permanent static magnetic field. When the stator winding is connected to the symmetrical three-phase alternating current, the rotor magnetic field rotates with the rotation of the stator magnetic field. Roller starts to work.

At present, most of the cooling methods of permanent magnet drums are water-cooled, which is complicated in process and prone to water leakage, resulting in electrical failures inside the drum. Moreover, the use of water-cooled permanent magnet drums requires a cooling water system on site, which increases the cost of use. Permanent magnet drums can be used in many workplaces, such as cement plants, steel mills and other non-explosion-proof places, and can also be used in explosion-proof places such as coal mines. When the surrounding environment is an explosion-proof place, the permanent magnet direct drive drum needs to be designed according to the requirements of the explosion-proof standard in terms of mechanical structure and electrical structure. When the permanent magnet direct drive drum is water-cooled, the connection between the cooling water pipe and the stator shaft needs to use a threaded flameproof surface. After the thread is eroded by the cooling water for a long time, there will be a possibility of flameproof failure. In addition to the threaded flameproof surface, the cooling water path of the water-cooled drum may also be rusted, which will reduce the heat dissipation capacity and affect the normal use of the equipment. The air-cooled drum does not have this problem, but in the existing air-cooled drum motor structure, There is no explosion-proof structure between the inside of the drum cavity and the external environment, and it does not have the effect of explosion-proof.

Utility model content

In order to solve the technical problems existing in the prior art, the utility model provides an air-cooled explosion-proof permanent magnet direct-drive drum structure, which can improve heat dissipation efficiency, enhance structural reliability, save space, reduce costs, and has good explosion-proof effect.

In order to achieve the above object, the technical scheme of the present utility model is:

An air-cooled flameproof permanent magnet direct-drive drum structure includes an air guide tube, the air guide tube includes a cylinder and an axial ventilation disc fixed on the inner wall of the cylinder, and one end face of the cylinder is provided with a a number of air inlet holes, the axial ventilation disc is provided with a number of air guide holes, and the inner wall of the cylinder is provided with a number of heat dissipation ribs;

The inner side of the air guide tube is fixed with a stator shaft, and the middle part of the end of the stator shaft away from the air inlet hole is provided with a main ventilation hole in the shaft, and the main ventilation hole in the shaft is ventilated through a number of inclined in-axis branches The hole is communicated with the inside of the air guide tube;

A stator iron core is fixed on the outer side of the air guide tube, and the stator iron core is provided with a stator coil;

The outer side of the air guide tube is also provided with a rotor sleeve, the end of the rotor sleeve is fixed with an end cover, the end cover and the air guide tube are rotatably connected through rolling bearings, and the inner wall of the rotor sleeve is fixed with a magnet. steel.

Further, the end of the stator shaft away from the main ventilation hole in the shaft is connected to the coil junction box through the connecting seat, the coil junction box is connected to the stator coil through the stator lead wire, and the stator lead wire passes through the air guide tube and the stator shaft.

Further, an annular protrusion is fixed on the inner wall of the end cover, and a gap is set between the annular protrusion and the inner wall of the rotor sleeve; the rolling bearing is provided with an inner cover, the inner cover and the outer wall of the air guide tube are arranged A gap is set between the two outer walls of the connecting seat; a circular groove is set on one outer wall of the connecting seat, the end surface of the stator shaft is fixedly connected to the bottom surface of the circular groove, and a gap is set between the outer wall of the stator shaft and the inner wall of the circular groove; The connecting seat and the coil junction box are connected by bolts; the box body of the coil junction box and the box cover are connected by bolts; Sealing treatment.

Further, the stator shaft is fixed to the drum support.

Further, a fan is provided at one end of the stator shaft where the main ventilation hole is arranged in the shaft, and the fan is installed on the roller support.

Further, the outer wall of the rotor sleeve is cast with glue.

Further, the stator core is formed by laminating punching sheets.

The beneficial effects of the present utility model:

1) The utility model adopts the air-cooled type as the cooling method, which prevents the cooling water from entering the cylinder, which causes the possibility of the reduction of the insulation value of the electrical components, saves the cooling water supply system, saves space and reduces equipment capital and maintenance costs;

2) The air-cooled air path of the present utility model adopts the form of exhaust air from the fan end, the air enters the air guide tube from the air inlet hole, and the inner wall of the air guide tube is welded with heat dissipation ribs for increasing the heat dissipation area, which can improve the heat dissipation efficiency and enhance the cooling effect. Structural reliability; the cooling air after heat exchange with the stator core is discharged into the environment through the fan, and the air is ubiquitous in the use space. Using it as a cooling medium can greatly reduce the cooling cost and facilitate the installation and layout of the permanent magnet drum , is also a renewable and environmentally friendly cooling medium;

3) When the environment around the permanent magnet drum is an explosion-proof place, the cooling method of the permanent magnet direct-drive drum is air-cooled, and the cooling water pipe is removed. The reliability and safety of the product are improved, the explosion-proof failure is avoided when the water-cooled cooling method is adopted, and the problem that the existing air-cooled drum does not have the effect of explosion-proof is solved.

Other features and advantages of the present invention will be partially described in detail in the following detailed description.

Description of drawings

Fig. 1 is the structural representation of a kind of air-cooled explosion-proof permanent magnet direct drive drum structure provided by the embodiment of the present invention;

2 is a ventilation and cooling air path diagram of an air-cooled explosion-proof permanent magnet direct-drive drum structure provided by an embodiment of the present invention;

Fig. 3 is the A-A sectional view of Fig. 2;

4 is a schematic structural diagram of an axial ventilation disk provided by an embodiment of the present invention.

Reference numerals in the accompanying drawings include:

1-fan, 2-roller support, 3-end cover, 4-rolling bearing, 5-rotor sleeve, 6-magnet, 7-stator core, 8-stator coil, 9-air guide, 10-stator shaft , 11-coil junction box, 12-connection seat, 13-stator lead wire, 14-heat dissipation rib, 15-axial ventilation disc, 16-air inlet hole, 17-air guide hole, 18-shaft inner branch ventilation hole , 19 - Main ventilation holes in the shaft.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. Example.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a mechanical connection or an electrical connection, or it may be a The internal communication between the two elements may be directly connected or indirectly connected through an intermediate medium, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific circumstances.

In order to solve the problems existing in the prior art, as shown in FIG. 1 to FIG. 4 , the present invention provides an air-cooled explosion-proof permanent magnet direct-drive drum structure, including an air guide duct 9 , and the air guide duct 9 includes a cylinder And the axial ventilation disc 15 fixed on the inner wall of the cylinder, one end face of the cylinder is provided with a number of air inlet holes 16, the axial ventilation disc 15 is provided with a number of air guide holes 17, and the inner wall of the cylinder is provided with a number of air inlet holes 16. 14 cooling ribs;

The inner side of the air guide tube 9 is fixed with a stator shaft 10, and the middle part of the end of the stator shaft 10 away from the air inlet hole 16 is provided with a main ventilation hole 19 in the shaft. The hole 18 is communicated with the inside of the air guide tube 9, and the air in the external environment enters the air guide tube 9 through the air inlet hole 16 of the air guide tube 9, and then moves to the air guide hole 17 of the axial ventilation disc 15 for heat dissipation, and finally passes through the air guide tube 9. The in-shaft branch ventilation holes 18 and the in-shaft main ventilation holes 19 of the stator shaft 10 are discharged to the environment;

The outer side of the air guide tube 9 is fixed with a stator iron core 7, and the stator iron core 7 is provided with a stator coil 8;

The outer side of the air guide tube 9 is also provided with a rotor sleeve 5, the end of the rotor sleeve 5 is fixed with an end cover 3, the end cover 3 and the air guide tube 9 are rotatably connected through the rolling bearing 4, and the inner wall of the rotor sleeve 5 is fixed with a magnet. After the steel 6 and the stator coil 8 are energized, the rotor drum, the end cover 3 and the magnetic steel 6 are rotated.

In this embodiment, the air guide duct 9 is fixed on the stator shaft 10. Preferably, the air guide duct 9 and the stator shaft 10 are connected by interference fit. The stator iron core 7 is fixed on the air guide tube 9. Preferably, the stator iron core 7 and the air guide tube 9 are connected by interference fit. The axial ventilation disc 15 and the heat dissipation ribs 14 are both welded and fixed to the inner wall of the cylinder. The stator shaft 10 only has openings at the ends to ensure the stability of the work. The main ventilation holes 19 in the shaft and the branch ventilation holes 18 in the shaft arranged obliquely can reduce the resistance, stabilize the wind speed, and improve the heat dissipation effect.

Further, the end of the stator shaft 10 away from the main ventilation hole 19 in the shaft is connected to the coil junction box 11 through the connecting seat 12, the coil junction box 11 is connected to the stator coil 8 through the stator lead wire 13, and the stator lead wire 13 passes through the air guide tube. 9 and the stator shaft 10 are used to energize the stator coil 8. When the three-phase current flows into the three-phase symmetrical winding of the stator, the magnetomotive force generated by the current synthesizes a rotating magnetomotive force with constant amplitude. Because the magnitude of its amplitude remains unchanged, the trajectory of this rotating magnetomotive force forms a circle, which becomes a circular rotating magnetomotive force. Since the rotational speed of the permanent magnet drum is constant at the synchronous rotational speed, the main magnetic field of the rotor and the rotating magnetic field generated by the circular rotating magnetomotive force of the stator remain relatively static. The two magnetic fields interact to form a synthetic magnetic field in the air gap between the stator and the rotor, which interacts with the main magnetic field of the rotor to generate an electromagnetic torque that pushes the drum to rotate, causing it to rotate.

Further, an annular protrusion is fixed on the inner wall of the end cover 3, and a gap is set between the annular protrusion and the inner wall of the rotor sleeve 5; One side outer wall of the connecting seat 12 is provided with a circular groove, the end face of the stator shaft 10 is fixedly connected with the bottom surface of the circular groove, and a gap is provided between the outer wall of the stator shaft 10 and the inner wall of the circular groove; the connecting seat 12 and the coil junction box 11 Connected by bolts; the box body of the coil junction box 11 is connected with the box cover by bolts; the connection between the stator lead wire 13 and the air guide 9 and the connection between the stator lead wire 13 and the stator shaft 10 are all sealed with glue.

In this embodiment, as shown in FIG. 1 , a gap is set between the annular protrusion on the inner wall of the end cover 3 and the inner wall of the rotor sleeve 5, that is, a cylindrical gap explosion-proof surface A is used between the end cover 3 and the rotor sleeve 5; A gap is set between the inner cover of the rolling bearing 4 and the outer wall of the air guide tube 9, that is, a cylindrical gap explosion-proof surface B is used between the rolling bearing 4 and the air guide tube 9; Gap, that is, a cylindrical gap flameproof surface E is used between the stator shaft 10 and the connecting seat 12; ; The box body of the coil junction box 11 and the box cover are connected by bolts, that is, a cylindrical gap flameproof surface G is used between the junction box and the environment; Sealing flameproof surface C is used between the lead wire 13 and the air guide tube 9; the connection between the stator lead wire 13 and the stator shaft 10 is sealed with glue, that is, the sealing glue is used between the stator lead wire 13 and the stator shaft 10. face D. Among the above-mentioned flameproof surfaces, the combination of flameproof surfaces A, B, E, F, and G is protected by the flameproof shell "d". The cooperation of surfaces C and D is protected by potting "m". The principle is to seal the gap of the joint surface for explosion-proof. In addition, the rolling bearing 4 adopts the prior art, and the rolling bearing 4 is used with the inner cover and the outer cover during installation. The present application only performs explosion-proof arrangement between the inner cover of the rolling bearing 4 and the outer wall of the air guide 9 . The connection seat 12 has a rectangular cavity structure, and the coil junction box 11 adopts the structure of the junction box in the prior art. This application only sets the connection method between the box body and the cover of the junction box. There is roughness on the contact surface of 11 and the contact surface between the box body and the box cover. Therefore, bolt connection is used to make the contact surface between the connection seat 12 and the coil junction box 11 and the contact surface between the box body and the box cover not. It will fit without gaps and meet the required size of the flameproof joint surface to make it have the effect of flameproof.

In this embodiment, the stator shaft 10 is fixed to the roller support 2, and when in use, the roller support 2 is connected to the bracket of the belt conveyor.

In this embodiment, the end of the stator shaft 10 where the main ventilation holes 19 are arranged in the shaft is provided with a fan 1 , and the fan 1 is installed on the roller support 2 .

In this embodiment, the outer wall of the rotor sleeve 5 is cast with glue to improve the frictional force between the outer wall of the rotor sleeve 5 and the belt.

In this embodiment, the stator core 7 is formed by laminating punched sheets to reduce iron loss during operation, and the stator coil 8 is embedded in the punching slot. The stator core 7 and the method of setting the stator coil 8 can be current technology.

The working principle of an air-cooled explosion-proof permanent magnet direct-drive drum structure of the utility model:

The permanent magnet direct drive roller generally refers to the power roller of the belt conveyor. In the previous belt conveyor, the asynchronous motor provided power to the roller through the reducer to make the belt conveyor run. The permanent magnet direct drive roller directly turned the power roller into a Permanent magnet synchronous motor, eliminating the need for a reducer, greatly reducing the amount of maintenance, and convenient speed adjustment;

As shown in Fig. 2, before the permanent magnet drum stator coil 8 is supplied with current, the cooling circuit generated by the fan 1 is turned on first, and the cooling air enters the air guide duct 9 from the environment around the drum through the air inlet hole 16, After the air duct 9 enters the in-shaft branch ventilation hole 18 and the main in-shaft ventilation hole 19 of the stator shaft 10, it is discharged into the environment through the fan 1; When it starts running, the drum in the working state will generate heat. When the heat is transferred to the inner wall of the air guide duct 9, the cooling air in the air guide duct 9 blows the inner surface of the air guide duct 9, and the heat is discharged to the drum together with the cooling air. In the external environment, the cooling air plays a role in reducing the temperature of the drum.

When the application adopts the air-cooling type as the cooling method, the cooling water can be prevented from entering the cylinder, resulting in the possibility of lowering the insulation value of the electrical components, and the cooling water supply system is omitted, which saves space and reduces equipment capital and maintenance costs; The cold air path adopts the form of exhausting air from one end of the fan. The air enters the air guide tube 9 through the air inlet hole 16. The inner wall of the air guide tube 9 is welded with heat dissipation ribs 14 for increasing the heat dissipation area, which can improve the heat dissipation efficiency and enhance the Structural reliability; the cooling air after heat exchange with the stator core 7 is discharged into the environment through the fan 1, and the air is ubiquitous in the use space. Using it as the cooling medium can greatly reduce the cooling cost and facilitate the installation of the permanent magnet drum. With the layout, there is also a renewable and environmentally friendly cooling medium.

The application adopts the method of gap explosion-proof surface and sealant explosion-proof surface, which greatly improves the reliability and safety of the product. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention. Variations, the scope of the present invention is defined by the claims and their equivalents.

Claims (7)

1. The air-cooled flame-proof type permanent magnet direct-drive roller structure is characterized by comprising an air duct, wherein the air duct comprises a cylinder and an axial ventilation disc fixedly arranged on the inner wall of the cylinder, a plurality of air inlet holes are formed in the end face of one end of the cylinder, a plurality of air guide holes are formed in the axial ventilation disc, and a plurality of heat dissipation ribs are arranged on the inner wall of the cylinder;

a stator shaft is fixedly arranged on the inner side of the air guide cylinder, an in-shaft main vent hole is formed in the middle of one end, far away from the air inlet hole, of the stator shaft, and the in-shaft main vent hole is communicated with the inside of the air guide cylinder through a plurality of obliquely arranged in-shaft branch vent holes;

a stator core is fixedly arranged on the outer side of the air duct, and is provided with a stator coil;

the outer side of the air duct is further provided with a rotor sleeve, an end cover is fixedly arranged at the end of the rotor sleeve, the end cover is rotatably connected with the air duct through a rolling bearing, and magnetic steel is fixed on the inner wall of the rotor sleeve.

2. The air-cooled flame-proof type permanent-magnet direct-drive roller structure as claimed in claim 1, wherein one end of the stator shaft, which is far away from the main ventilation hole in the shaft, is connected with a coil junction box through a connecting seat, the coil junction box is connected with a stator coil through a stator lead wire, and the stator lead wire penetrates through the air guide cylinder and the stator shaft.

3. The air-cooled flameproof permanent-magnet direct-drive roller structure according to claim 2, wherein an annular bulge is fixedly arranged on the inner wall of the end cover, and a gap is arranged between the annular bulge and the inner wall of the rotor sleeve; the rolling bearing is provided with an inner cover, and a gap is formed between the inner cover and the outer wall of the air guide cylinder; the outer wall of one side of the connecting seat is provided with a circular groove, the end surface of the stator shaft is fixedly connected with the bottom surface of the circular groove, and a gap is formed between the outer wall of the stator shaft and the inner wall of the circular groove; the connecting seat is connected with the coil junction box through a bolt; the box body of the coil junction box is connected with the box cover through a bolt; the joint of the stator lead wire and the air duct and the joint of the stator lead wire and the stator shaft are all processed by sealing glue.

4. The air-cooled flameproof permanent-magnet direct-drive roller structure according to any of claims 1 to 3, wherein the stator shaft is fixed to the roller support.

5. The air-cooled flameproof permanent-magnet direct-drive roller structure according to any of claims 1 to 3, wherein a fan is arranged at one end of the stator shaft, which is provided with the main ventilation hole in the shaft, and the fan is mounted on the roller support.

6. The air-cooled flameproof permanent-magnet direct-drive roller structure according to any of claims 1 to 3, wherein the outer wall of the rotor sleeve is cast with glue.

7. The air-cooled flameproof permanent-magnet direct-drive roller structure according to any of claims 1 to 3, wherein the stator core is formed by lamination of punching sheets.

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