Magnetic suspension outer rotor mining local fan

Abstract

The invention belongs to the field of coal mine underground ventilation safety, and relates to a magnetic suspension outer rotor mining local ventilator which comprises a shell, a rotor, a stator and a wiring accessory. The shell comprises an air duct, and a front supporting rib, a rear supporting rib and a stationary blade which are arranged on the inner wall of the air duct; the rotor comprises a motor shell provided with a rotor permanent magnet, a movable blade installed outside the motor shell and an end cover provided with an outer magnetic levitation assembly; the stator comprises a supporting shaft, a stator winding installed on the supporting shaft, and an inner magnetic levitation assembly and a bearing which are arranged at the two ends of the supporting shaft. The wiring attachment is configured to connect an external power source to the stator winding through the support shaft internal passage. The problems of an existing ventilator are solved, the ventilation efficiency and safety are improved, and the operation cost and maintenance difficulty of equipment are reduced. The novel ventilator can provide more powerful guarantee for safety production of an underground coal mine, and injects new vitality for sustainable development of coal mine enterprises at the same time.

Description

Technical Field

[0001] The present invention belongs to the field of mine underground ventilation safety and relates to a magnetic levitation outer rotor mine local ventilator. Background Art

[0002] During the production process in coal mines underground, the safety and reliability of ventilation equipment are directly related to the production efficiency of the entire mine and the lives of operating personnel. At present, the counter-rotating axial local ventilator widely used in coal mines underground has a structure such as an inner rotor and a single-sided cantilever arrangement of impellers (see Figure 2 ), although it meets the ventilation requirements to a certain extent, a series of problems it has cannot be ignored.

[0003] First of all, the problem of uneven bearing force on the motor shaft is particularly prominent. In the existing counter-rotating axial local ventilator, the design of the inner rotor structure causes the motor bearings to bear additional dynamic reaction forces. This uneven force situation, under long-term high-load operation, will lead to abnormal heating and increased wear of the bearings, and even cause faults such as bearing seizure. Once the bearings are damaged, it will not only cause the ventilator to stop running, affecting the normal ventilation of the mine, but may also trigger more serious safety accidents. In addition, the abnormal heating and wear of the bearings will also increase the equipment maintenance cost and reduce the service life of the equipment.

[0004] Secondly, the problem of the motor coil bearing additional electromagnetic load cannot be underestimated. In the counter-rotating axial local ventilator, while the motor coil generates a magnetic field to drive the rotor to rotate, it also needs to bear additional electromagnetic load. This load will cause the coil to heat up abnormally, and in severe cases, it will even damage the coil, resulting in equipment shutdown. The damage of the coil will not only affect the normal operation of the ventilator, but may also trigger a series of chain reactions, such as interruption of underground air flow, gas accumulation, etc., posing a serious threat to the safety production in coal mines underground.

[0005] Furthermore, the problem of relatively large deformation deflection of the motor shaft is also a major safety hazard existing in the existing ventilators. Since the motor shaft is prone to deformation when bearing a large load, resulting in an increase in deflection, the blades may rub violently against the inner wall of the fan housing during rotation. This friction will not only generate a large amount of sparks, damage the fan equipment, but may also trigger serious accidents such as fires. In addition, the friction between the blades and the inner wall of the fan housing will cause the fan efficiency to decrease, affect the ventilation effect, and further increase the safety risk of the mine.

[0006] In addition to the above three main problems, the existing counter-rotating axial local ventilator also has some other problems, such as high equipment noise and difficult maintenance. These problems not only affect the use effect of the ventilator, but also increase the operation cost and maintenance difficulty of the equipment.

[0007] In summary, the problems existing in the existing spin - press - in axial - flow local ventilators cannot be ignored. These problems not only affect the normal operation and safety of the ventilators, but also restrict the production efficiency in underground coal mines and the life safety of operating personnel. Therefore, it is particularly important to develop a new type of, safer and more reliable mine local ventilator. Summary of the Invention

[0008] In view of this, the purpose of the present invention is to provide a magnetic - levitation outer - rotor mine local ventilator to solve the existing problems.

[0009] To achieve the above - mentioned purpose, the present invention provides the following technical solution: A magnetic - levitation outer - rotor mine local ventilator includes a housing, a rotor - stator, and a wiring accessory; the housing includes a wind tunnel, front support ribs, rear support ribs, and static blades provided on the inner wall of the wind tunnel; the rotor includes a motor housing provided with rotor permanent magnets, moving blades installed outside the motor housing, and end covers configured with outer magnetic - levitation components; the stator includes a support shaft, a stator winding installed on the support shaft, and inner magnetic - levitation components and bearings provided at both ends of the support shaft; the wiring accessory is configured to connect an external power supply to the stator winding through the internal channel of the support shaft.

[0010] Optionally, the front support ribs are a structure of 3 groups evenly welded at 120 degrees on the inner wall of the wind tunnel.

[0011] Optionally, the static blades are multiple guide vanes welded along the circumferential direction between the outer ring of the rear support ribs and the inner wall of the wind tunnel.

[0012] Optionally, the moving blades are evenly fixed on the outer circumferential surface of the motor housing by rivets.

[0013] Optionally, the motor housing and the end cover are connected by bolts distributed circumferentially.

[0014] Optionally, the rotor permanent magnets are fixed to the inner side wall of the motor housing by bolts.

[0015] Optionally, the support shaft is connected to the central circular holes of the front support ribs and the rear support ribs through keys.

[0016] Optionally, the inner ring of the bearing and the support shaft are in interference fit, and the outer ring of the bearing is fixedly connected to the housing structure.

[0017] Optionally, the outer magnetic - levitation component includes an outer magnetic - isolation ring and an outer magnetic - levitation.

[0018] Optionally, the inner magnetic - levitation component includes an inner magnetic - levitation and an inner magnetic - isolation ring.

[0019] The beneficial effects of the present invention are as follows: The present invention comprehensively and effectively improves and innovates in response to the problems existing in the existing axial-flow local ventilator with a spinning-in type. This new type of ventilator not only improves the ventilation efficiency, but also brings significant beneficial effects in terms of safety, stability, and maintenance convenience.

[0020] First of all, the magnetic levitation outer-rotor mine local ventilator effectively solves the problem of uneven bearing force on the motor shaft. By adopting magnetic levitation technology and the outer-rotor structure design, the balanced distribution of the bearing force on the motor shaft is achieved, greatly reducing the additional dynamic reaction force on the bearing, thereby avoiding faults such as abnormal heating and seizure of the bearing. This not only extends the service life of the bearing, but also improves the overall stability and reliability of the ventilator.

[0021] Secondly, this ventilator also solves the problem of the motor coil bearing additional electromagnetic load. The application of magnetic levitation technology enables the motor coil not to bear additional electromagnetic load, thereby avoiding the situation of abnormal heating and damage of the coil. This not only reduces the downtime of the equipment, lowers the maintenance cost, but also improves the operation efficiency and safety of the ventilator.

[0022] Furthermore, the magnetic levitation outer-rotor mine local ventilator effectively solves the problem of large deformation deflection of the motor shaft. The design of the outer-rotor structure makes the motor shaft not easily deformed when bearing the load, thereby avoiding the severe friction between the blades and the inner wall of the fan housing. This not only reduces the noise and wear of the equipment, but also improves the efficiency and safety of the fan. At the same time, this design also makes the structure of the ventilator more compact and reasonable, which is conducive to the installation and maintenance of the equipment.

[0023] In addition, the magnetic levitation outer-rotor mine local ventilator also has other remarkable beneficial effects. For example, due to the adoption of advanced magnetic levitation technology, the ventilator runs more smoothly and quietly, reducing the noise interference to the operating personnel; at the same time, this ventilator also has an intelligent control function, which can adjust the air volume according to the actual needs of the mine, achieving the purpose of energy conservation and consumption reduction.

[0024] In summary, the beneficial effects of a magnetic levitation outer-rotor mine local ventilator are very significant. It not only solves the problems existing in the existing ventilator, improves the ventilation efficiency and safety, but also reduces the operation cost and maintenance difficulty of the equipment. This new type of ventilator will provide more powerful guarantee for the safe production underground in coal mines, and at the same time inject new vitality into the sustainable development of coal mining enterprises.

[0025] Other advantages, objects, and features of the present invention will be set forth in part in the following description, and in part will be obvious to those skilled in the art upon examination of the following, or may be learned from the practice of the present invention. The objects and other advantages of the present invention may be realized and obtained by the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0027] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 is a schematic diagram of the structure of an existing mine local ventilator.

[0029] Reference numerals: motor housing 1, rotor permanent magnet 2, stator winding 3, moving blade 4, connecting bolt 5, end cover 6, rear support rib 7, static blade 8, outer magnetic isolation ring 9, outer magnetic levitation 10, inner magnetic levitation 11, inner magnetic isolation ring 12, support shaft 13, shaft inner wire outlet hole 131, bearing 14, bearing outer ring 141, bearing inner ring 142, wire conduit 15, junction box 16, bolt 17, air duct 18, front support rib 19, rivet 20, key 21. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention schematically. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0031] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged, or reduced, and do not represent the dimensions of actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0032] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] Specific Embodiment 1

[0034] Please refer to Figure 1 , which is a magnetic levitation outer rotor mine local ventilator, consisting of four parts: a housing, a rotor, a stator, and a wiring accessory.

[0035] The housing is composed of a wind tunnel 18, front support ribs 19, rear support ribs 7, and static blades 8; the front support ribs 19 are 3 groups evenly distributed at 120 degrees and welded to the inner wall of the wind tunnel 18; the rear support ribs 7 are cylindrical, and multiple static blades 8 are welded along the circumference between its outer ring and the inner wall of the wind tunnel 18, which play the role of both supporting and guiding the flow.

[0036] The rotor is composed of a motor housing 1, rotor permanent magnets 2, moving blades 4, connecting bolts 5, end covers 6, outer magnetic isolation rings 9, outer magnetic levitation 10, and bearing outer rings 141; the motor housing 1 is connected to the end cover 6 by bolts 5, the motor housing 1 and the rotor permanent magnets 2 are fixed together by bolts 17, the moving blades 4 are evenly connected to the circumference of the motor housing 1 by rivets 20, and the end cover 6 contains a combination of an outer magnetic isolation ring 9 and an outer magnetic levitation 10.

[0037] The stator is composed of a stator winding 3, an inner magnetic levitation 11, an inner magnetic isolation ring 12, a support shaft 13, and bearing inner rings 142; the stator winding 3 is sleeved on the support shaft 13, bearings 14 are sleeved at both ends of the support shaft 13, and a combination of an inner magnetic levitation 11 and an inner magnetic isolation ring 12 is sleeved at both ends of the support shaft 13;

[0038] The wiring accessory is composed of a junction box 16, a conduit 15, and an axial inner wire outlet hole 131. The external power supply is connected to the stator winding 3 through the wires in the junction box 16, the conduit 15, and the axial inner wire outlet hole 131, so as to generate an alternating electromagnetic field, thereby driving the rotor to rotate. After the air pressure is increased by the moving blades and the flow is guided by the static blades, air supply is realized.

[0039] Specific Embodiment 2

[0040] In this embodiment, the stator support shaft 13 is connected to the central circular holes of the front support rib 19 and the rear support rib 7 of the outer shell through a key 21 to transmit torque and gravity; the stator and the rotor are connected and interact with each other through a bearing 14, an inner magnetic levitation 11, an inner isolation magnetic ring 12 combination, an outer isolation magnetic ring 9, an outer magnetic levitation 10 combination, a stator winding 3, and a rotor permanent magnet 2, wherein the bearing 14 plays a guiding and small amount of supporting role, the repulsive force between the inner magnetic levitation 11 and the outer magnetic levitation 10 plays a major load-bearing supporting role, and the electromagnetic force between the stator winding 3 and the rotor permanent magnet 2 plays a rotational driving force role.

[0041] In this embodiment, the fan rotor is located between the two end supports, the support shaft 13, the bearing 14 and the stator winding 3 are evenly stressed, and the additional dynamic load is small. The deformation disturbance of the support shaft 13 is small, and the impeller is not easy to rub the shell. The bearing 14 and the stator winding 3 are not easy to heat up and be damaged. The repulsive force between the inner magnetic levitation 11 and the outer magnetic levitation 10 plays a major role in bearing support, and the bearing force is greatly reduced, further reducing its load and improving its service life.

[0042] The present invention solves the problem that the motor bearings are subjected to uneven force, bear additional dynamic reaction force, and are prone to abnormal heating and locking of the bearings, and greatly reduces the bearing force, thereby increasing their service life; it solves the problem that the motor coils bear additional electromagnetic loads, and the coils are subjected to abnormal heating and damage; it solves the problem that the motor shaft deflection is large, and the blades may rub violently against the inner wall of the fan casing when rotating, generating a large number of sparks, damaging the fan, and affecting the safety of underground coal mines.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A magnetic levitation outer rotor mine local ventilator, characterized in that: It includes a housing, a rotor stator, and a wiring accessory; The housing includes a wind tunnel, front support ribs, rear support ribs, and static blades provided on the inner wall of the wind tunnel; The rotor includes a motor housing provided with rotor permanent magnets, moving blades installed outside the motor housing, and end covers configured with external magnetic levitation components; The stator includes a support shaft, a stator winding installed on the support shaft, and internal magnetic levitation components and bearings provided at both ends of the support shaft; The wiring accessory is configured to connect an external power supply to the stator winding through the internal channel of the support shaft.

2. The magnetic levitation outer rotor mine local ventilator according to claim 1, characterized in that: The front support ribs are a structure of 3 groups evenly welded at 120 degrees on the inner wall of the wind tunnel.

3. The magnetic levitation outer rotor mine local ventilator according to claim 1, characterized in that: The static blades are multiple guide vanes welded between the outer circle of the rear support ribs and the inner wall of the wind tunnel along the circumferential direction.

4. A magnetic levitation outer rotor mine local ventilator according to claim 1, characterized in that: The moving blades are evenly fixed on the outer circumferential surface of the motor housing by rivets.

5. A magnetic levitation outer rotor mine local ventilator according to claim 1, characterized in that: The motor housing and the end cover are connected by bolts distributed circumferentially.

6. The magnetic levitation outer rotor mine local ventilator according to claim 1, characterized in that: The rotor permanent magnets are fixed to the inner side wall of the motor housing by bolts.

7. A magnetic levitation outer rotor mine local ventilator according to claim 1, characterized in that: The support shaft is connected to the central circular holes of the front support ribs and the rear support ribs through keys.

8. A magnetic levitation outer rotor mine local ventilator according to claim 1, characterized in that: The inner ring of the bearing is in interference fit with the support shaft, and the outer ring of the bearing is fixedly connected to the housing structure.

9. A magnetic levitation outer rotor mine local ventilator according to claim 1, characterized in that: The external magnetic levitation component includes an external magnetic isolation ring and an external magnetic levitation.

10. A magnetic levitation outer rotor mine local ventilator according to claim 1, characterized in that: The internal magnetic levitation component includes an internal magnetic levitation and an internal magnetic isolation ring.

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