CN113847257A

CN113847257A - Magnetic suspension axial flow fan structure

Info

Publication number: CN113847257A
Application number: CN202110955285.4A
Authority: CN
Inventors: 姚莹海; 钟仁志; 袁军; 韩春江
Original assignee: Xinlei Compressor Co Ltd
Current assignee: Xinlei Compressor Co Ltd
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2021-12-28
Anticipated expiration: 2041-08-19
Also published as: CN113847257B

Abstract

The invention discloses a magnetic suspension axial flow fan structure which is characterized by comprising a fan assembly, a motor assembly and an inlet guide vane regulator which are sequentially arranged in a straight line manner, wherein a motor cylinder is arranged outside the motor assembly; the fan assembly comprises a static impeller and a movable impeller, and the static impeller is fixedly connected with one end of the motor barrel; the movable impeller and the fixed impeller are arranged adjacently; the motor assembly comprises a main shaft, a rotor assembly and a stator assembly, the movable impeller is fixedly connected with the main shaft, and the main shaft drives the movable impeller to rotate; import stator regulator includes the casing with motor cylinder one end fixed connection, and the casing is equipped with a plurality of import stator along its circumference, and the import stator includes passive stator and the initiative stator of connecting drive element, and the import stator outside is equipped with the transmission pinion, rotates on the casing to be equipped with the transmission bull gear that cooperates all transmission pinions. The invention has the advantages of higher structural stability and high reliability particularly during the adjustment of the intake air volume.

Description

Magnetic suspension axial flow fan structure

Technical Field

The application relates to the technical field of axial flow fans, in particular to a magnetic suspension axial flow fan structure.

Background

Axial flow fans are generally applied to occasions with high flow requirements, comprise fan impellers and a casing, and are fans commonly used by working condition enterprises. As an impeller machine, the axial flow fan often needs to adjust the flow or pressure of a working medium during operation, and has high requirement on the adjustment precision. However, the traditional inlet guide vane regulator is usually arranged in contact with the main shaft of the impeller, and the gap is small, so that the flow transmission of the axial flow fan is not facilitated. For example, in chinese patent literature, patent No. CN2012206549875 discloses a multi-stage high-efficiency centrifugal compressor with axial air intake in 2013, 5, 15, and the application discloses an air inlet cylinder installed at one end of a welded casing where air is taken in, and a bearing seat installed in the air inlet cylinder; the main shaft is arranged in the welding machine shell, one end of the main shaft is supported by a bearing in a bearing seat, the other end of the main shaft is supported by a bearing in the welding machine shell, the first-stage impeller and the second-stage impeller are respectively arranged on the main shaft, and a partition plate arranged on the welding machine shell is arranged between the two-stage impellers; an inlet guide vane regulator arranged on the welding shell is arranged at the inlet of the first-stage impeller, a ring is arranged on the partition plate and forms a closed flow passage with the first-stage impeller, and a balance disc, an end seal and an oil seal sleeved on the main shaft are sequentially arranged between the second-stage impeller and the other end of the main shaft; an interstage seal is arranged on the partition plate, a mouth ring seal is arranged between the secondary impeller and the partition plate, and a balance disc seal is arranged between the balance disc and the welding machine shell.

The defects of the prior art are as follows: the gap between the guide vane and the main shaft of the inlet guide vane regulator is small, the axial air intake is completely dominated by the inlet guide vane regulator, when the inlet guide vane regulator regulates the flow, the axial flow fan is greatly influenced by the flow regulation precision, and the stability of the axial flow fan during operation can be reduced by a relatively extensive regulation mode.

Disclosure of Invention

Based on the defects in the prior art, the invention provides a magnetic suspension axial flow fan structure which has higher structural stability and high reliability particularly during air inlet volume adjustment.

In order to achieve the above object, the present invention adopts the following technical solutions.

A magnetic suspension axial flow fan structure is characterized by comprising a fan component, a motor component and an inlet guide vane regulator which are arranged in a straight line in sequence,

a motor barrel is arranged outside the motor component;

the fan assembly comprises a static impeller and a movable impeller, and the static impeller is fixedly connected with one end of the motor barrel; the movable impeller and the fixed impeller are arranged adjacently;

the motor assembly comprises a main shaft, a rotor assembly and a stator assembly, the movable impeller is fixedly connected with the main shaft, and the main shaft drives the movable impeller to rotate;

import stator regulator includes the casing with motor cylinder one end fixed connection, and the casing is equipped with a plurality of import stator along its circumference, and the import stator includes passive stator and the initiative stator of connecting drive element, and the import stator outside is equipped with the transmission pinion, rotates on the casing to be equipped with the transmission bull gear that cooperates all transmission pinions.

The fan assembly, the motor assembly and the inlet guide vane regulator are sequentially arranged, and the inlet guide vane is separated from the main shaft, so that a through hole with stable flow can be formed between the end parts of the inlet guide vane, and the axial flow fan has higher regulation reliability while ensuring the wind power effect. During wind-force adjustment, according to the operating mode of difference, the rotatory angle of import stator blade regulator, the air current will be along being the passageway circulation of certain angle with the axial direction of admitting air, fluid enters the motor jar behind the import stator blade regulator, motor element drive movable impeller doing work to the fluid, fluidic energy increases and gets into stationary impeller along the axial, stationary impeller guides the fluid, fluidic pressure and temperature reduce this moment, the velocity of flow increases, turn into kinetic energy with thermal potential energy, the flow of this application is big, high transmission efficiency, can adjust the rotational speed according to the operating mode demand, realize pressure, the adjustment of flow, can practice thrift more electric energy, better protection fan.

Preferably, the stationary impeller comprises an outer ring fixed to the motor cylinder, an inner ring is arranged in the outer ring, a blade body is arranged between the outer ring and the inner ring, the fan assembly further comprises a fairing fixed to the inner ring, and the outer ring is fixedly provided with an expansion pipe. The stationary impeller not only has the function of fluid guiding, but also has the function of connecting and supporting, is connected with the fairing and the motor cylinder, and is beneficial to realizing the rotary sealing of the movable impeller; fluid passes through the fairing after passing through the stationary impeller and enters the diffuser pipe, and kinetic energy of the fluid is converted into static pressure energy, so that air outlet of the axial flow fan is more stable.

Preferably, the rotor assembly is integrated in the main shaft, and magnetic suspension bearings are respectively arranged between two ends of the main shaft and the motor cylinder. The active magnetic suspension bearing technology is adopted, the rotor suspension is realized by utilizing electromagnetic force, no contact, no friction, no lubricating oil and long service life are realized.

Preferably, an air inlet fairing is arranged at one end, facing the inlet guide adjuster, of the motor barrel, an air inlet is formed in the air inlet fairing, a heat dissipation impeller facing the air inlet is fixedly arranged at one end of the main shaft, and a cooling flow channel corresponding to the air inlet is formed in the motor barrel. Can be with inside leading-in motor element of part air current through heat dissipation impeller, realize motor rotor's automatically cooling, prolong motor element's life.

Preferably, end covers matched with the motor assembly are arranged at two ends of the motor cylinder, the end covers are rotatably connected with the main shaft through bearings, the cooling flow channel comprises a cooling hole formed in the end cover and a cooling gap formed between the stator assembly and the main shaft, the cooling flow channel further comprises a motor cylinder inner cavity located between the air inlet and the cooling hole and between the cooling hole and the cooling gap, and an air outlet hole matched with the cooling flow channel is formed in the motor cylinder. Automatic heat dissipation of the motor assembly is achieved.

Preferably, the motor barrel comprises an inner barrel and an outer barrel, a plurality of supporting flow guide columns are arranged between the inner barrel and the outer barrel, the motor assembly is arranged inside the inner barrel, wiring holes communicating the inside of the inner barrel and the outside of the outer barrel are formed in the supporting flow guide columns, and a base plate is arranged on the outer side of the outer barrel. The motor barrel plays a role in supporting and installing the motor assembly and positioning the magnetic suspension bearing connecting line, and can also be used for conducting the airflow of the axial flow fan, so that the motor barrel is good in functionality.

Preferably, twelve inlet guide vanes are arranged in a circumferential array around the axis of the shell, each inlet guide vane comprises a connecting shaft, and a transmission pinion is fixedly connected to the connecting shaft; one end of the connecting shaft is provided with a mounting disc, the mounting disc is provided with a guide vane body, the guide vane body comprises two opposite arc-shaped side surfaces, the two arc-shaped side surfaces are bent in the same direction, one ends of the two arc-shaped side surfaces are intersected, the other ends of the two arc-shaped side surfaces are provided with transition arcs, one ends of the guide vane body, which are connected with the mounting disc, are provided with transition surfaces, and the inner side wall of the shell is provided with a limiting groove matched with the transition surfaces; the connecting surface of the guide vane body on the mounting disc is positioned on one side of the axis of the mounting disc. Twelve inlet guide vanes are uniformly arranged, so that uniform and reliable flow regulation effect is provided; the installation disc improves axial limit, the transition surface is attached to the transition arc, the rotation stability of the inlet guide vane is improved, and the two cambered surfaces arranged in the same direction of the guide vane body can provide an arc-shaped flow guide channel which has better stability compared with a plane-shaped channel; the connecting surface of the guide vane body on the mounting disc is positioned on one side of the axis of the mounting disc, an eccentric structure is formed, the bending force applied to the connecting shaft is reduced, the torsional force applied to the guide vane body is mainly borne by the mounting disc, and the service life of the connecting shaft is prolonged.

Preferably, the maximum area projection shape of the guide vane body on the plane where the axis of the connecting shaft is located is an isosceles trapezoid shape with an arc-shaped upper bottom and an arc-shaped lower bottom. The two sides of the guide vane body are symmetrical, so that a symmetrical flow guiding effect is provided, the stability of the two sides is ensured, and the structural strength of the guide vane body is improved.

Preferably, the transmission pinion is a bevel gear, and the vertex angle of the bevel gear is arranged towards the axis of the shell; the outer layer of the shell is provided with a step part, the inner side of the large transmission gear ring is provided with an installation bearing used for connecting the large transmission gear ring and the shell, the outer side of the step part is fixedly provided with a step ring, and one side of the step ring is fixedly connected with an inner ring of the installation bearing. The stepped part is matched with the stepped ring to form a stepped secondary fixing surface, so that the inner ring of the mounting bearing can be reliably fixed, the large size of the transmission large gear ring is matched, and the transmission stability of the transmission large gear ring is improved.

Preferably, the movable impeller comprises a connecting inner disc, a connecting plate, a connecting outer ring and a movable impeller body, the connecting inner disc is fixedly connected to the main shaft, and the outer side of the connecting outer ring is connected with the outer side of the inner ring of the stationary impeller; the connecting inner disc is connected with the connecting outer ring through the connecting plate, the connecting plate and the connecting outer ring form a connecting disc, a plurality of movable blades are arranged on the connecting disc, a step surface is formed between the connecting outer ring and the connecting plate, a sealing ring which is in contact with the inner side of the connecting outer ring is arranged on the step surface, the connecting outer ring and the sealing ring are arranged in a relative rotating mode, and sealing teeth which are matched with the inner side of the connecting outer ring are arranged on the periphery of the sealing ring. The sealing ring is arranged to realize the rotary sealing between the movable impeller and the motor assembly, prevent the air flow in the air duct of the axial flow fan from radiating into the motor assembly to influence the flow of the axial flow fan, and ensure the reliable flow control of the fan.

Preferably, the main shaft is provided with a pull rod in a threaded connection mode, and the screwing direction between the pull rod and the main shaft is opposite to the rotating direction of the movable impeller; be equipped with the fixed orifices in the movable impeller, the both ends of fixed orifices are equipped with spacing step respectively, and the pull rod passes the fixed orifices, and the pull rod diameter is less than the fixed orifices, is equipped with the spacing ring of diameter cooperation fixed orifices on the pull rod, and the pull rod outer end is equipped with nut pretightening. The movable impeller is connected by a pull rod, the movable impeller and the main shaft are connected together by the pull rod, the movable end surface of the impeller is tightly matched with the end surface of the main shaft by the pull force of the pull rod, and the limiting step plays a role in strengthening and positioning to ensure the normal work of the impeller; the pull rod and the main shaft are connected together through threads, the screwing direction of the threads is opposite to the screwing direction of the rotor, self-locking is realized in the working process, and the reliability is improved.

The invention has the following beneficial effects: a through hole with stable flow can be formed between the end parts of the inlet guide vanes, so that the wind power effect of the axial flow fan is ensured, and the adjustment reliability is higher; the flow is large, the transmission efficiency is high, the rotating speed can be adjusted according to the working condition requirement, the adjustment of pressure and flow is realized, more electric energy can be saved, and the fan is protected better; the automatic cooling of the motor rotor is realized, and the service life of the motor assembly is prolonged.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a structural schematic of the motor assembly of the present invention.

FIG. 3 is a schematic view of a stator vane wheel according to the present invention.

FIG. 4 is a side view of a stationary impeller in accordance with the present invention.

FIG. 5 is a schematic view of the inlet guide vane of the present invention.

Fig. 6 is a right side view of fig. 5.

Fig. 7 is a schematic view of the structure of the motor cartridge of the present invention.

Fig. 8 is an enlarged schematic view at a in fig. 1.

Fig. 9 is a schematic structural view of the connection of the main shaft and the movable impeller in the present invention.

In the figure: supporting guide column 103 routing hole 104 base plate 105 emptying groove 104 outer cylinder 102 of motor cylinder 1 inner cylinder 101 outer cylinder 102 supporting guide column 103 routing hole 104 base plate 105 emptying groove 106 end cover 107 stationary impeller 200 moving impeller 201 outer wheel ring 202 inner wheel ring 203 blade body 204 fairing 205 expanding pipe 206 mounting groove 207 sealing ring 208 moving impeller outer ring 209 connecting inner disc 210 connecting plate 211 connecting outer ring 212 moving blade body 213 pull rod 214 fixing hole 215 pre-tightening nut 217 main shaft 3 rotor assembly 31 stator assembly 32 left end half shaft 301 right end half shaft 302 permanent magnet 303 first magnetic isolation ring 304 second magnetic isolation ring 305 permanent magnet protective sleeve 306 front end spacer 307 radial magnetic bearing rotor 308 radial bearing measured body 309 right end shaft shoulder 310 thrust disc 311 rear end spacer 312 magnetic suspension bearing 313 air inlet fairing 314 air inlet heat dissipation impeller 316 cooling hole 317 cooling gap 318 motor cylinder inner cavity 319 cooling hole 320 housing 4 inlet guide vane 41 is cooled by guide column Moving guide vane 42 driving guide vane 43 driving pinion 401 driving big gear ring 402 connecting shaft 403 mounting disc 404 guide vane body 405 arc side 406 transition surface 408 limiting groove 409 limiting ring 410 mounting bearing 411 step ring 412.

Detailed Description

The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, is provided to enable those skilled in the art to more readily understand the advantages and features of the present application, and is intended to more clearly and distinctly define the scope of the invention, which is set forth by way of illustration only and is not intended to be limiting of the invention.

In the embodiment of the method, the first step,

as shown in fig. 1 to 9, a magnetic suspension axial flow fan structure is characterized by comprising a fan assembly, a motor assembly and an inlet guide vane 41 regulator which are arranged in a straight line in sequence. Other monitoring equipment such as a wind pressure meter or a flow meter and the like are arranged in the axial flow fan, and the air quantity can be adjusted by automatically controlling the inlet guide vane adjuster.

The motor barrel 1 is arranged outside the motor component; the motor barrel 1 comprises an inner barrel 101 and an outer barrel 102, a plurality of supporting guide columns 103 are arranged between the inner barrel 101 and the outer barrel 102, a motor component is arranged inside the inner barrel 101, wiring holes 104 communicating the inside of the inner barrel 101 with the outside of the outer barrel 102 are formed in the supporting guide columns 103, base plates 105 are arranged on the outer side of the outer barrel 102, two symmetrical base plates 105 are arranged at two ends of the outer barrel 102, and a relief groove 106 is formed in the middle of each base plate 105. End covers 107 matched with the motor components are arranged at two ends of the motor barrel 1, the end covers 107 are rotatably connected with the main shaft 3 through bearings, the motor barrel 1 adopts an internal air outlet design, a fluid channel is formed between the outer barrel 102 and the inner barrel 101 through supporting flow guide columns 103 which are separately arranged, partial heat of the motor can be taken away by fluid in the conveying process, and the heat dissipation effect of the whole machine is enhanced; five supporting flow guide columns 103 are arranged, so that the load distribution of the motor cylinder 1 is more reasonable; the supporting guide column 103 carries out simulation analysis on the front edge and the tail edge by a computational fluid mechanics method, so that the resistance of the supporting column to fluid is reduced to the greatest extent; the number of the wire holes 104 is three, which are respectively a motor power line outlet hole, a front magnetic bearing outlet hole and a rear magnetic bearing outlet hole, the number of the wire holes cannot be less than three, otherwise, the motor power line can interfere with other lines, and the performance of the motor is further influenced; the base plate 105 and the motor cylinder 1 are of an integrated structure and are integrally formed during casting, so that the integrated structure is more reasonable, the rigidity and the stability of the motor cylinder 1 are further enhanced, and the shock resistance of the whole machine is enhanced; the structure of the base plate 105 is "vented" through the vent slot 106. From the design point of view, the larger the size of the base and the larger the contact area with the ground, the better the stability. However, in practical situations such as machining, the base is large in size and is cast integrally with the cylinder, so that the parallelism of the machined surface of the base is difficult to guarantee, and the base is difficult to completely fit with the ground. The "emptying" is thus carried out in the middle part of the bedplate 105, so that the support mode is changed to a certain extent to "four-point support", enhancing the shock resistance and stability of the barrel.

The fan assembly comprises a stationary impeller 200 and a movable impeller 201, wherein the stationary impeller 200 is fixedly connected with one end of the motor barrel 1; the movable impeller 201 and the stationary impeller 200 are adjacently arranged; the stationary vane 200 includes an outer ring 202 fixed to the motor casing 1, a connection cover is screwed to one end of the motor casing 1, and the outer ring 202 of the stationary vane 200 is screwed to the connection cover. An inner wheel ring 203 is arranged in the outer wheel ring 202, a blade body 204 is arranged between the outer wheel ring 202 and the inner wheel ring 203, the fan assembly further comprises a fairing 205 fixed on the inner wheel ring 203, and an expansion pipe 206 is fixedly arranged on the outer wheel ring 202. The inner wall of the expanding tube 206 is shaped like a truncated cone. In the structure of the magnetic suspension axial flow fan, a proper gap must be kept between the movable impeller 201 and the static impeller 200, otherwise the movable impeller 201 cannot rotate, but the existence of the axial gap causes the scattering phenomenon of fluid in the gap between the movable impeller and the static impeller, thereby causing air leakage loss, and the installation groove 207 is arranged on the static impeller 200 and is used for being matched with the step surface to position and arrange the sealing ring 208, so that the air leakage can be effectively reduced; the movable vane outer ring 209 matched with the outer end of the movable vane 201 is fixedly arranged on the stationary vane 200, the movable vane outer ring 209 is made of PEEK materials, when the movable vane 201 rotates at a high speed, the top of the vane can deform slightly, and the vane can be protected due to the characteristics of the PEEK materials. The blade top and the blade root front edge of the stationary impeller 200 are chamfered, so that the stress concentration effect of the blade root can be effectively reduced, and the fatigue damage and the fracture failure of the blade are effectively reduced; the connecting plate 211 is arranged separately, so that the movable impeller 201 is hollowed, and the weight is lightest on the premise of ensuring the performance of the movable impeller 201.

The movable impeller 201 comprises a connecting inner disc 210, a connecting plate 211, a connecting outer ring 212 and a movable impeller body 213, the connecting inner disc 210 is fixedly connected to the spindle 3, the spindle 3 is provided with a pull rod 214 in a threaded connection mode, and the screwing direction between the pull rod 214 and the spindle 3 is opposite to the screwing direction of the movable impeller 201; the connecting inner disc 210 is internally provided with a fixing hole 215, two ends of the fixing hole 215 are respectively provided with a limiting step, the pull rod 214 penetrates through the fixing hole 215, the diameter of the pull rod 214 is smaller than that of the fixing hole 215, the pull rod 214 is provided with a limiting ring 216 with the diameter matched with the fixing hole 215, and the outer end of the pull rod 214 is provided with a pre-tightening nut 217. The outer side of the connecting outer ring 212 is engaged with the outer side of the inner ring of the stator vane 200; the connecting inner disc 210 and the connecting outer ring 212 are connected through the connecting plate 211, the connecting plate 211 and the connecting outer ring 212 form a connecting disc, a plurality of movable blade bodies 213 are arranged on the connecting disc, a step surface is formed between the connecting outer ring 212 and the connecting plate 211, the step surface is provided with a sealing ring 208 which is in contact with the inner side of the connecting outer ring 212, the connecting outer ring 212 and the sealing ring 208 are arranged in a relative rotating mode, and the periphery of the sealing ring 208 is provided with sealing teeth which are matched with the inner side of the connecting outer ring 212. The sealing rings 208 connected to both ends of the outer ring 212 are fixedly connected to the end cover 107 and the inner ring 203, respectively, by screws. The movable impeller 201 is made of a carbon fiber and resin composite material, and compared with a traditional metal alloy, the movable impeller has the advantages that the weight is reduced, and meanwhile, the abrasion resistance and the corrosion resistance are improved. Lightening holes are formed between the connecting plates 211 and are distributed on the wheel disc in a circumferential manner, so that the weight of the impeller is greatly reduced while the impeller keeps good aerodynamic performance, the vibration of a rotor in a rotating state is effectively reduced, and the balance and the stability are improved; when the magnetic suspension motor is shut down, the suspended rotor falls on the protective bearing, and the smaller the weight of the rotor is, the longer the service life of the bearing can be prolonged; the blade root front edge of the movable impeller 201 is chamfered, so that the stress concentration effect of the blade root can be effectively reduced, and the fatigue failure and the fracture failure of the blade are effectively reduced.

The motor assembly comprises a main shaft 3, a rotor assembly 31 and a stator assembly 32, the stator assembly 32 is fixed in the motor barrel 1, and the stator assembly 32 comprises an iron core and windings. The movable impeller 201 is fixedly connected with the main shaft 3, and the main shaft 3 drives the movable impeller 201 to rotate; rotor assembly 31 is arranged inside main shaft 3 in an integrated manner, main shaft 3 includes a left end half shaft 301 and a right end half shaft 302, a cylindrical permanent magnet 303 is arranged between left end half shaft 301 and right end half shaft 302, a first magnetism isolating ring 304 and a second magnetism isolating ring 305 are respectively arranged between permanent magnet 303 and left end half shaft 301 and right end half shaft 302, a permanent magnet protective sleeve 306 with two ends lapped between left end half shaft 301 and right end half shaft 302 is arranged on the periphery of permanent magnet 303, and permanent magnet 303, permanent magnet protective sleeve 306, first magnetism isolating ring 304 and second magnetism isolating ring 305 form rotor assembly 31. The left-end half shaft 301 is sleeved with a front-end spacer 307, a radial magnetic bearing rotor 308 and a radial bearing measured body 309 in sequence from the permanent magnet protective sleeve to the outside; the right half shaft 302 is provided with a right shaft shoulder 310 matched with the permanent magnet protective sleeve 306, and the right shaft shoulder 310 is outwards provided with a thrust disc 311, a rear end spacer 312, a radial magnetic bearing rotor 308 and a radial magnetic bearing detected body in sequence. Magnetic suspension bearings 313 are respectively arranged between the two ends of the main shaft 3 and the motor cylinder 1. An air inlet fairing 314 is arranged at one end of the motor barrel 1 facing the inlet guide regulator, an air inlet 315 is arranged on the air inlet fairing 314, a heat dissipation impeller 316 facing the air inlet 315 is fixedly arranged at one end of the main shaft 3, and a cooling flow channel corresponding to the air inlet 315 is arranged in the motor barrel 1. The cooling flow channel includes a cooling hole 317 formed in the end cover 107 and a cooling gap 318 formed between the stator assembly 32 and the main shaft 3, the cooling flow channel further includes a motor casing internal cavity 319 located between the air inlet 315 and the cooling hole 317 and between the cooling hole 317 and the cooling gap 318, and an air outlet hole 320 matched with the cooling flow channel is formed in the motor casing 1.

The inlet guide vane 41 regulator comprises a housing 4 fixedly connected with one end of the motor barrel 1, and the housing 4 is in a circular tube shape. The housing 4 and the motor cartridge 1 are connected by a flange. The casing 4 is provided with a plurality of inlet guide vanes 41 along the circumferential direction thereof, and the inlet guide vanes 41 include passive guide vanes 42 and active guide vanes 43 connected to a driving element, which is a servo motor. The outside of the inlet guide vane 41 is provided with a transmission pinion 401, and the housing 4 is rotatably provided with a transmission large gear ring 402 which is matched with all the transmission pinions 401. In this embodiment, twelve inlet guide vanes 41 are provided, twelve inlet guide vanes 41 are arranged in a circumferential array around the axis of the housing 4, each inlet guide vane 41 includes a connecting shaft 403, the length of the connecting shaft 403 of the driving guide vane 43 is greater than that of the connecting shaft 403 of the driven guide vane 42, and the long connecting shaft 403 of the driving guide vane 43 is used for reliably connecting with the driving element. The transmission pinion 401 is fixedly connected to the connecting shaft 403; one end of the connecting shaft 403 is provided with a mounting disc 404, the mounting disc 404 is provided with a guide vane body 405, the guide vane body 405 comprises two arc-shaped side surfaces 406 which are oppositely arranged, the two arc-shaped side surfaces 406 are bent in the same direction, one ends of the two arc-shaped side surfaces 406 are intersected, the other ends of the two arc-shaped side surfaces 406 are provided with transition arcs, one end of the guide vane body 405, which is connected with the mounting disc 404, is provided with a transition surface 408, and the inner side wall of the shell 4 is provided with a limit groove 409 matched with the transition surface 408; the connecting surface of the guide vane body 405 on the mounting disc 404 is located on one side of the axis of the mounting disc 404. The maximum area projection shape of the guide blade body 405 on the plane where the axis of the connecting shaft 403 is located is an isosceles trapezoid shape with an arc-shaped upper bottom and a circular arc-shaped lower bottom. The shaded area in fig. 5 is a schematic representation of a cross-section of the guide vane body 405 at the corresponding location. The transmission pinion 401 adopts a bevel gear, and the vertex angle of the bevel gear is arranged towards the axis of the shell 4; the outer layer of the shell 4 is provided with a step part 410, the inner side of the large transmission gear ring 402 is provided with a mounting bearing 411 used for connecting the large transmission gear ring 402 and the shell 4, the outer side of the step part 410 is fixedly provided with a step ring 412, and one side of the step ring 412 is fixedly connected with the inner ring of the mounting bearing 411.

Fan subassembly, motor element and import stator 41 regulator set gradually in this application, and import stator 41 breaks away from main shaft 3 to can form the through-hole of flow stability between the tip of import stator 41, guarantee axial fan's wind-force effect simultaneously, have higher regulation reliability. During wind-force adjustment, according to the operating mode of difference, the rotatory angle of import stator 41 regulator, the air current will be along the passageway circulation that is certain angle with the axial direction of admitting air, fluid enters motor jar 1 behind import stator 41 regulator, motor element drive movable impeller 201 does work to the fluid, fluidic energy increases and gets into stationary impeller 200 along the axial, stationary impeller 200 leads the fluid, fluidic pressure and temperature reduce this moment, the velocity of flow increases, turn into kinetic energy with thermal potential energy, the flow of this application is big, high transmission efficiency, can adjust the rotational speed according to the operating mode demand, realize pressure, the adjustment of flow, can practice thrift more electric energy, better protection fan. The inside cooling runner that has set up of motor element of this application, the air inlet can be accomplished to the last cooling runner of motor element, takes away the inside heat of motor element, and the main part heat dissipation is mainly accomplished through the runner on the motor barrel 1, and the radiating effect is good.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A magnetic suspension axial flow fan structure is characterized by comprising a fan component, a motor component and an inlet guide vane regulator which are arranged in a straight line in sequence,

a motor barrel is arranged outside the motor component;

2. The structure of claim 1, wherein the stationary impeller comprises an outer ring fixed to the motor casing, an inner ring is disposed inside the outer ring, and blades are disposed between the outer ring and the inner ring, and the fan assembly further comprises a fairing fixed to the inner ring, and an expansion pipe is fixed to the outer ring.

3. The structure of claim 1, wherein the rotor assembly is integrally disposed inside the main shaft, and magnetic bearings are disposed between two ends of the main shaft and the motor cylinder.

4. The structure of claim 1, wherein the motor cylinder has an inlet cowling at an end facing the inlet guide regulator, the inlet cowling has an inlet port, a heat dissipating impeller is fixed to an end of the shaft opposite to the inlet port, and a cooling channel is defined in the motor cylinder corresponding to the inlet port.

5. The structure of the axial flow fan with magnetic suspension as claimed in claim 4, wherein the motor cylinder has end caps at both ends for engaging with the motor assembly, the end caps are rotatably connected with the main shaft through bearings, the cooling channel includes cooling holes disposed on the end caps and cooling gaps disposed between the stator assembly and the main shaft, the cooling channel further includes a cavity inside the motor cylinder between the air inlet and the cooling holes and between the cooling holes and the cooling gaps, and the motor cylinder has air outlet holes for engaging with the cooling channel.

6. The structure of a magnetic suspension axial flow fan according to claim 1, 2 or 4, wherein the motor barrel comprises an inner barrel and an outer barrel, a plurality of supporting guide posts are arranged between the inner barrel and the outer barrel, the motor assembly is arranged inside the inner barrel, the supporting guide posts are provided with wire holes communicating the inside of the inner barrel and the outside of the outer barrel, and the outer side of the outer barrel is provided with a base plate.

7. The structure of the magnetic suspension axial flow fan as claimed in claim 1, wherein twelve inlet guide vanes are arranged in a circumferential array around the axis of the housing, each inlet guide vane comprises a connecting shaft, and the transmission pinion is fixedly connected to the connecting shaft; one end of the connecting shaft is provided with a mounting disc, the mounting disc is provided with a guide vane body, the guide vane body comprises two opposite arc-shaped side surfaces, the two arc-shaped side surfaces are bent in the same direction, one ends of the two arc-shaped side surfaces are intersected, the other ends of the two arc-shaped side surfaces are provided with transition arcs, one ends of the guide vane body, which are connected with the mounting disc, are provided with transition surfaces, and the inner side wall of the shell is provided with a limiting groove matched with the transition surfaces; the connecting surface of the guide vane body on the mounting disc is positioned on one side of the axis of the mounting disc.

8. The structure of the axial flow fan with magnetic suspension as claimed in claim 7, wherein the maximum area projection of the guide blade body on the plane of the axis of the connecting shaft is in the shape of an isosceles trapezoid with an arc-shaped upper bottom and an arc-shaped lower bottom.

9. The structure of the axial flow fan with magnetic suspension as claimed in claim 1 or 7, wherein the transmission pinion is a bevel gear, and the vertex angle of the bevel gear is arranged towards the axis of the shell; the outer layer of the shell is provided with a step part, the inner side of the large transmission gear ring is provided with an installation bearing used for connecting the large transmission gear ring and the shell, the outer side of the step part is fixedly provided with a step ring, and one side of the step ring is fixedly connected with an inner ring of the installation bearing.

10. The structure of a magnetic suspension axial flow fan as claimed in claim 1, wherein the movable impeller comprises a connecting inner disk, a connecting plate, a connecting outer ring and a movable impeller body, the connecting inner disk is fixedly connected to the main shaft, and the outer side of the connecting outer ring is jointed with the outer side of the inner ring of the stationary impeller; the connecting inner disc is connected with the connecting outer ring through the connecting plate, the connecting plate and the connecting outer ring form a connecting disc, a plurality of movable blades are arranged on the connecting disc, a step surface is formed between the connecting outer ring and the connecting plate, a sealing ring which is in contact with the inner side of the connecting outer ring is arranged on the step surface, the connecting outer ring and the sealing ring are arranged in a relative rotating mode, and sealing teeth which are matched with the inner side of the connecting outer ring are arranged on the periphery of the sealing ring.