CN103486058B - Motor side external formula one drag two counter-rotating axial fan - Google Patents
Motor side external formula one drag two counter-rotating axial fan Download PDFInfo
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Abstract
A kind of motor side external formula one drag two counter-rotating axial fan, it is high that it mainly solves existing propeller fan manufacture cost, operational reliability, Security are lower, the technical problems such as repair and maintenance work difficulty is large, and improve motor and run working environment and force-bearing situation.Its drip irrigation device is: the front impeller of fixed installation (2), rear impeller (7) on two output shafts being arranged on the transmission case (6) in main frame cylindrical shell (3) inner core on support, guide vane (5) and guide vane controlling mechanism (4) are set in annular pass between two impellers, outside main frame cylindrical shell (3) side direction, arrange motor support base (16), the motor (15) be arranged on motor support base (16) connects with transmission case (6).It can be widely used in mine, in the industry such as metallurgy, chemical industry, power plant, especially for the ventilation plant with workplaces such as blast, high temperature, corrosion.
Description
Technical field
The present invention relates to a kind of ventilator, particularly a kind of axial fan.
Background technique
At present, ventilator is the universal machine being widely used in national economy every profession and trade.Divide centrifugal blower and the large class of axial-flow blower two.So-called axial-flow blower, just refer on axial section, air-flow in the runner of rotation blade along axial direction flowing ventilator, from appearance, the housing of axial-flow blower is again the part in air channel, the blade of blower fan is along the circumferential direction evenly arranged on wheel hub, and wheel hub is fixedly mounted on the motor-shaft extending arranged in the axial direction, and motor is axial arranged along cylindrical shell.This blower fan is large because having flow, and volume is little, the feature that pressure head is low, is mainly used in various needs in the ventilation system of large discharge.In order to improve pressure, be applied to the ventilation system that fed distance is longer or system resistance is larger, the normal form adopting multistage-combination.General way is designed to revolving structure.Identical by two impeller diameters, revolution is identical, the axial-flow blower series operation that sense of rotation is contrary.In order to adapt to carry the flammable needs bursting into the special media such as part and burn into high temperature containing certain.Have except explosion-proof, high temperature resistant, corrosion resistant motor except supporting, and, require motor and gas flow completely isolated.So, be structurally the form of inside and outside suit by barrel designs.Annular space between inside and outside cylindrical shell is runner.Motor is arranged in inner core.And take airtight measure.Consider the structural strength of motor mount and the needs of motor ventilation heat radiation, several prismatics or oval ventilation duct are set between inside and outside cylindrical shell., there is following some shortcomings part in the axial-flow blower of this structural type.
1, axial dimension is comparatively large, mounting arrangements inconvenience.Because Axial-flow fan motor axially installs, comparatively large in the size of its length direction, the needs consider that again motor is installed, safeguarding and ventilate, the barrel lenght of blower fan is generally also long than motor, like this, makes the length dimension of whole blower fan larger.When plural serial stage is installed, and increase noise elimination structure, the size of its length direction is just larger.
2, operational reliability is poor.Impeller is fixedly supported upon in the shaft extension of motor front end, forms cantilever support.In running, the dynamic load of existing radial direction, has thrust load again, and the shaft strength situation of motor front end is bad.The lubricating condition of bearing is also poor, although devise the oiling outside cylindrical shell into and out of oil pipe.But because of many reasons, the lubrication problem of motor bearings never solves very well, and motor bearings burns out with premature abrasion and therefore causes the phenomenon of motor damage often to have generation.
3, the maintenance of motor and bearing and service work difficulty larger.Because motor is very heavy, have again impeller to be fixedly mounted on axle, no matter be dismounting or lifting, workload and work difficulty are all quite large.Although blower fan cylindrical shell is mostly opposite opened removable structure, open cylindrical shell upper part, unload impeller, motor is taken out or installs, it not part nothing the matter.Just not saying need employ large tonnage crane, install after disintegration, its installation precision is difficult to ensure again.
4, manufacture cost is high.This is mainly reflected in following several respects:
Motor is arranged in runner, must select and have flame proof, high temperature resistant, the product of decay resistance, and its cost ratio common electric machine wants high 20-30%.
When fans in series uses, every Fans has multiple electric motors, and when its control system adopts the form of one-to-one, automatical control system cost is high.
The manufacture cost of axial-flow blower is mainly in host groups, and when series connection uses, multiple independently host groups, combines, and complete machine cost is higher.
5, the Security of system and equipment operation is poor.Be applied to the axial-flow blower of mine ventilation, safe operation problem is the most key.Except adopting anti-explosion motor, also need motor and runner to be carried out close to isolate.The medium of process is high temperature, corrosive gas, and the apolegamy of motor security level requires higher, needs too to isolate with medium in runner.However, because of the accident that motor contact medium causes, still of common occurrence.
6, adaptability has a definite limitation.Due to impeller be direct connection on motor, by the restriction of motor pole number and power classification, the rotating speed of ventilator and the excursion of performance number are just restricted.
Summary of the invention
The object of this invention is to provide that a kind of work is more reliable, longer service life, cost of production significantly reduce and the motor side external formula one drag two counter-rotating axial fan that the adjustment of maintenance and inspection and blade is convenient, in order to thoroughly to solve, existing propeller fan manufacture cost is high, operational reliability, Security compared with low, repair and maintenance work difficulty is large, the technical problems such as bad adaptability, and improve motor operation working environment and force-bearing situation.
The technical solution adopted for the present invention to solve the technical problems is: it comprises front impeller 2, main frame cylindrical shell 3, guide vane controlling mechanism 4, guide vane 5, transmission case 6, rear impeller 7, inner coupling (10), transmission shaft 11, outside coupling 14, motor 15 and motor support base 16, main frame cylindrical shell 3 comprises urceolus and inner core, there is end plate at inner core two ends, transmission case 6 is arranged on the support in main frame cylindrical shell 3 inner core, impeller 2 before fixed installation on two output shafts of transmission case 6, rear impeller 7, between two impellers in annular pass, be provided with guide vane 5 and guide vane controlling mechanism 4, motor support base 16 is outside equipped with in main frame cylindrical shell 3 side direction, mounted motor 15 on motor support base 16, motor 15 is by outside coupling 14, transmission shaft 11, inner coupling 10 connects with transmission case 6.
Be provided with slip ring 1 before described main frame cylindrical shell 3, after be provided with noise elimination diffusion barrel 8.
Described transmission case 6 adopts case structure, comprises upper shell 601, temperature transducer 602, lower shell body 603, cooling water connector 604, lubricant oil inlet and outlet connectors 605, output shaft 606, gland 607, oil sealing 608, bearing 609, driven wheel of differential 610, locking nut 611, drive bevel gear 612 and input shaft 613, be provided with oil storage cavity in transmission case 6, cooling water connector 604 and lubricant oil inlet and outlet connectors 605, mechanism housing is made up of upper shell 601 and lower shell body 603, housing central section is provided with output shaft 606, bearing 609 coordinates with output shaft 606, oil sealing 608 and gland 607 is provided with outside bearing 609, and at bearing 609 place set temperature sensor 602, output shaft 606 and input shaft 613 are set to 90 degrees in same level, one end of two output shafts 606, connect Impeller respectively, the other end connects driven wheel of differential 610 by locking nut 611, and two driven wheels of differential 610 engage with drive bevel gear 612, and drive bevel gear 612 is fixed on input shaft 613 by locking nut 611.
Cooling water connector 604 is connected with water-cooling tube 9, is picked out outside main frame cylindrical shell 3, be connected with drainage pipeline by water-cooling tube 9; Lubricant oil inlet and outlet connectors 605 picks out outside main frame cylindrical shell 3 by pipeline, and the pipeline opening outside main frame cylindrical shell 3 arranges oil level indicator 12.
The input shaft 613 of transmission case 6 and the output shaft of motor 15, two axial lines in same plane, and on the same line.On the same line, main frame cylindrical shell 3 inner chamber bottom arranges dunnage for the output shaft 603 of transmission case 6 and the axis of main frame cylindrical shell 3.
The number of teeth of two driven wheels of differential 610 is identical, the gear ratio of drive bevel gear 612 and driven wheel of differential 610, can be greater than 1 or be less than 1 or equal 1.
Outside coupling 14 is provided with dome dish or friction wheel, dome dish or friction wheel are furnished with break 13.
Between the inner core and urceolus of main frame cylindrical shell 3, arrange some guide vanes 5, all guide vanes 5 connect with guide vane controlling mechanism 4.
The invention has the beneficial effects as follows: the propeller fan of said structure mode, by motor being arranged on the motor support base of the lateral position outside main frame cylindrical shell, design the transmission case that has dual output function, draught fan impeller is installed on the output shaft of transmission case, be connected with transmission shaft, coupling between transmission case with motor, utilize the rotation direction of two output shafts contrary, the principle that rotating speed is identical, realize the job requirement of Counter rotating axial flow Fan, and reach the purpose of design of motor one drag two.
Accompanying drawing explanation
Fig. 1 is forward structure cross-sectional schematic of the present invention.
Fig. 2 is left TV structure schematic diagram of the present invention.
Fig. 3 is plan structure schematic diagram of the present invention.
Fig. 4 is transmission case forward schematic diagram of the present invention.
Fig. 5 is transmission case side schematic view of the present invention.
Fig. 6 is transmission case top view cross section structural representation of the present invention.
In figure: 1-slip ring, impeller before 2-, 3-main frame cylindrical shell, 4-guide vane controlling mechanism, 5-guide vane, 6-transmission case, impeller after 7-, 8-noise elimination diffusion barrel, 9-water-cooling tube, the inner coupling of 10-, 11-transmission shaft, 12-oil level indicator, 13-break, the outside coupling of 14-, 15-motor, 16-motor support base, 601-upper shell, 602-temperature transducer, 603-lower shell body, 604-cooling water connector, 605-lubricant oil inlet and outlet connectors, 606-output shaft, 607-gland, 608-oil sealing, 609-bearing, 610-driven wheel of differential, 611-locking nut, 612-drive bevel gear, 613-input shaft.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
Embodiment 1, the invention provides a kind of motor side external formula one drag two counter-rotating axial fan, it is characterized in that: it comprises front impeller 2, main frame cylindrical shell 3, guide vane controlling mechanism 4, guide vane 5, transmission case 6, rear impeller 7, inner coupling (10), transmission shaft 11, outside coupling 14, motor 15 and motor support base 16, main frame cylindrical shell 3 comprises urceolus and inner core, annular space between inside and outside cylindrical shell is the runner of gas, there is end plate at inner core two ends, prevent from or reduce harmful air currents entering inner core and impacting transmission case.Transmission case 6 is arranged on the support in main frame cylindrical shell 3 inner core, impeller 2 before fixed installation on two output shafts of transmission case 6, rear impeller 7, between two impellers in annular pass, be provided with guide vane 5 and guide vane controlling mechanism 4, guide vane 5 can arrange several as required, each stator 5 connects with guide vane controlling mechanism 4, when adopting manual or the rotation of Electronic control controlling mechanism, the synchronous interaction of all guide vanes 5, realize the adjustment of blade angle, make the flow outlet direction of a grade blade and the airflow inlet direction of two grade blades, all at a certain ideal position.Be outside equipped with motor support base 16 in main frame cylindrical shell 3 side direction, motor support base 16 as required, can be made overall structure with main frame cylindrical shell 3 or makes absolute construction.Mounted motor 15 on motor support base 16, motor 15 is connected with transmission case 6 by outside coupling 14, transmission shaft 11, inner coupling 10.Consult Fig. 1 to Fig. 6.
Embodiment 2, are provided with slip ring 1 before described main frame cylindrical shell 3, improve fan efficiency, after be provided with noise elimination diffusion barrel 8, reduce noise effect.Consult Fig. 1 to Fig. 6, all the other are with embodiment 1.
Embodiment 3, described transmission case 6 adopts case structure, comprise upper shell 601, temperature transducer 602, lower shell body 603, cooling water connector 604, lubricant oil inlet and outlet connectors 605, output shaft 606, gland 607, oil sealing 608, bearing 609, driven wheel of differential 610, locking nut 611, drive bevel gear 612 and input shaft 613, oil storage cavity is provided with in transmission case 6, cooling water connector 604 and lubricant oil inlet and outlet connectors 605, shoe cream room and cooling water passage not connected, mechanism housing is made up of upper shell 601 and lower shell body 603, lower shell body 603 plays supporting and oil storage effect, housing central section is provided with two output shafts 606, output shaft 606 coordinates with bearing 609, oil sealing 608 and gland 607 is provided with outside bearing 609, output shaft 606 and input shaft 613 are set to 90 degrees in same level, input shaft and output shaft are bearing on support by bearing, the relative position of bearing and axle is fixed to adopt gland to ensure, oil sealing is adopted to prevent oil seepage.And at bearing 609 place set temperature sensor 602, the temperature transducer 602 of bearing is arranged on upper shell, is connected on the Displaying Meter outside main frame cylindrical shell with cable.One end of two output shafts 606, connect Impeller respectively, the other end connects driven wheel of differential 610 by locking nut 611, and two driven wheels of differential 610 engage with drive bevel gear 612, and drive bevel gear 612 is fixed on input shaft 613 by locking nut 611.When driving gear rotates, two driven gears are with same rotational speed, and opposite direction rotates, thus realizes the function of motor one drag two, and make impeller meet rotation requirement to revolving.Consult Fig. 1 to 6, all the other same above-described embodiments.
Embodiment 4, and the cooling water connector 604 on the lower shell body of transmission case is connected with water-cooling tube 9, is picked out outside main frame cylindrical shell 3, be connected with drainage pipeline by water-cooling tube 9; Lubricant oil inlet and outlet connectors 605 picks out outside main frame cylindrical shell 3 by pipeline, can from the outside charging-up lubricant oil of main frame, also can at the outside discarded lubricant oil of releasing of main frame, lubricant oil adopts the thin oils such as machine oil, pipeline opening outside main frame cylindrical shell 3 arranges oil level indicator 12, is convenient to the hydraulic height of observing transmission case.Consult Fig. 1 to 6, all the other same above-described embodiments.
Embodiment 5, the output shaft of the input shaft of transmission case 6 613 and motor 15, two axial lines in same plane, and on the same line.On the same line, main frame cylindrical shell 3 inner chamber bottom arranges dunnage, for fixed conveyor case 6 for the output shaft 603 of transmission case 6 and the axis of main frame cylindrical shell 3.Consult Fig. 1 to 6, all the other same above-described embodiments.
Embodiment 6, the number of teeth of two driven wheels of differential 610 is identical, the gear ratio of drive bevel gear 612 and driven wheel of differential 610, can be greater than 1 or be less than 1 or equal 1, by changing the gear ratio of driving gear and driven gear, velocity ratio can be made to be greater than 1 or be less than 1 or equal 1.Consult Fig. 1 to 6, all the other same above-described embodiments.
Embodiment 7, and outside coupling 14 is provided with dome dish or friction wheel, and dome dish or friction wheel are furnished with break 13.Consult Fig. 1 extremely, 6, all the other same above-described embodiments.
Embodiment 8, between the inner core and urceolus of main frame cylindrical shell 3, arrange some guide vanes 5, and all guide vanes 5 connect with guide vane controlling mechanism 4.Guide vane controlling mechanism passes through pneumatic or Electric actuator, the static or dynamic angle regulating guide vane.Consult Fig. 1 to Fig. 6, all the other same above-described embodiments.
Embodiment 9, and the motor side external formula one drag two propeller fan according to technique scheme design compares with the propeller fan of conventional construction, has following advantage:
1, novel in design.Existing propeller fan, impeller is mostly be fixed on the axle head of motor, realizes direct-connection transmission.Also there are some axial-flow blowers, on the antero posterior axis of motor, fix an impeller respectively, but its sense of rotation are identical, can not realize revolving.Also the axial-flow blower had, realizes motor one drag two by transmission case, and as the axial-flow blower of K series, but the rotation of impeller does not meet the feature to revolving yet.The present invention has the transmission case of two output shafts by design, replaces motor position and is arranged in main frame cylindrical shell.And motor is shifted out, be arranged on the side direction support of main frame cylindrical shell.By coupling and propeller shaft couplings between motor and transmission case.The structural feature of following several respects is had: one is that motor (15) adopts transmission shaft (11) with the Placement of transmission case (6) after improvement; Two is the axial direction of motor (15) and the output axes normal of transmission case (6).Meanwhile, the output shaft of transmission case (6) and input shaft direction layout in 90 ° in the horizontal plane.Three is that transmission case is designed to export the gearbox being greater than or less than or equaling input speed, is different from common speed reducer.
2, manufacture cost reduces greatly.Be mainly reflected in following several respects.
First be adopt common electric machine replacement explosion-proof, high temperature resistant, etch-proof special machines, its expense is reduction about 30%, offsets and increases the expense of transmission case, still will save motor buying or the manufacturing cost of about 20%.
Secondly, adopt the motor that a power is larger, replace the motor that two power is less, manufacturing expense or buying expenses all have and significantly reduce.
Again, after electric machine external, not needing two host groups, utilizing the host groups of a V belt translation case just can realize revolving, reach the object improving blast, structural simplification, makes materials consumption reduce, and manufacturing process is simple, save many manufacturing costs.
Secondary again, the control gear of a motor, although power of motor increases, its expense will be lacked more than the regulate expenditure of two motors.
3, improve in operational reliability, Security and working life.The fault of axial-flow blower in running, the mainly problem of motor aspect, as the reasons such as overload cause bearing to burn out, as oil supply pipeline blocks the insufficient lubrication caused, as ventilation duct blocking causes electric machine temperature rise too high etc.Adopt transmission case and external motor, and in transmission case, increase the measure such as water cooling plant and thin oil lubricant, the possibility that bearing burns out, greatly in reduction, even if there is damage, changed and also will be facilitated a lot.Motor does not need oil supply pipeline to lubricate, and does not need ventilation duct yet, substantially avoid the operation troubles of motor.Motor is arranged on outside housing, not with the medium contact in runner, is being applied to coal mine drainage and contains the occasion of methane gas, stopping the possibility of exploding completely.Safety in operation is greatly improved.In the system being applied to high temperature, corrosive gas, the working life of motor improves greatly.On break coupling mounted externally, and adopt electro-hydraulic brake, fewer than the heating of built-in break, retro-speed is fast, and reliability is higher.This point, for main fan for mines, needs, when calamitous operating mode occurs, to carry out inverted ventilation in time, have prior meaning.
4, performance range increases, and adaptability is wider.Be mainly reflected in following several respects:
Electric machine external outside cylindrical shell, be not only adapted to flammable can the use of quick-fried operating mode occasion, as the ventilation in colliery.And be adapted to the operating mode occasion of high-temperature flue gas, as the ventilation of the rugged environment such as steel mill of power plant.
After electric machine external, only need the transmission case that boundary dimension is less in inner core, the randomness of inner diameter of steel flue size variation is comparatively large, thus makes the degrees of freedom of fan blade and hub ratio design larger, and the performance number scope with plane No. blower fan is wider, and adaptability is also improved.
According to channel theory, the flow of blower fan is directly proportional to rotating speed, and square being directly proportional of blast and rotating speed, is directly proportional to the cube of power.After impeller diameter and blade structure are determined, because the velocity ratio of transmission case can be changeable arbitrarily, the rotating speed of blower fan is no longer by the restriction of motor pole number.According to working condition, the velocity ratio of transmission case can be changed, just can meet the demands.In a sense, change the velocity ratio of transmission case, just equal to have changed a Fans.
5, external dimension are few, save installing space.Adopt the external motor type structure of the technical program, the length of host groups is only the half of the length of the built-in host groups of separate unit, thus the whole length of blower fan greatly reduces.The construction amount of its installation foundation also will reduce.
6, overhaul, safeguard and adjust more convenient.The axial-flow blower of conventional construction mode, maintenance and the inspection of motor must take outer cylinder body apart, and motor is taken out.Adopt the technical program, motor is arranged on outside main frame cylindrical shell, and lubrication, ventilation condition is improved greatly, and rate of fault greatly reduces, even if there is fault, it is also very convenient to safeguard.Transmission case is arranged in main frame cylindrical shell, but have employed thin oil lubricant and circulating water, can improve its load-carrying properties in the design by many kinds of measures in addition, can ensure that long trouble free runs completely, even if there is fault, because its volume and weight is fewer than motor, safeguard also much easier.
7, there is good energy-saving effect.This major embodiment is both ways:
Suppose that total output is identical, adopt the motor that a power is larger, the motor more less than employing two power, the electromagnetism loss of motor itself will be lacked, and useful horsepower is improved.
Adopt transmission case to replace motor direct-connection transmission, transmission efficiency will reduce about 3%.But after electric machine external, more unobstructed in runner, host groups length also reduces, the viscous loss of gas in runner reduces, and the efficiency of blower fan can be made to improve 3%-5%, thus, the efficiency of complete machine is increased.Consult Fig. 1 to Fig. 6, all the other same above-described embodiments.
Claims (7)
1. a motor side external formula one drag two counter-rotating axial fan, it is characterized in that: it comprises front impeller (2), main frame cylindrical shell (3), guide vane controlling mechanism (4), guide vane (5), transmission case (6), rear impeller (7), inner coupling (10), transmission shaft (11), outside coupling (14), motor (15) and motor support base (16), main frame cylindrical shell (3) comprises urceolus and inner core, inner core, annular space between urceolus is the runner of gas, there is end plate at inner core two ends, prevent from or reduce harmful air currents entering inner core and impacting transmission case, transmission case (6) is arranged on the support in main frame cylindrical shell (3) inner core, impeller (2) before fixed installation on two output shafts of transmission case (6), rear impeller (7), between two impellers in annular pass, be provided with guide vane (5) and guide vane controlling mechanism (4), guide vane (5) arranges several as required, each guide vane (5) connects with guide vane controlling mechanism (4), when adopting manual or the rotation of Electronic control controlling mechanism, all guide vanes (5) synchronous interaction, realize the adjustment of blade angle, make the flow outlet direction of a grade blade and the airflow inlet direction of two grade blades, all at a certain ideal position, motor support base (16) is outside equipped with in main frame cylindrical shell (3) side direction, the upper mounted motor (15) of motor support base (16), motor (15) is by outside coupling (14), transmission shaft (11), inner coupling (10) connects with transmission case (6), described transmission case (6) adopts case structure, comprise upper shell (601), temperature transducer (602), lower shell body (603), cooling water connector (604), lubricant oil inlet and outlet connectors (605), output shaft (606), gland (607), oil sealing (608), bearing (609), driven wheel of differential (610), locking nut (611), drive bevel gear (612) and input shaft (613), oil storage cavity is provided with in transmission case (6), cooling water connector (604) and lubricant oil inlet and outlet connectors (605), mechanism housing is made up of upper shell (601) and lower shell body (603), housing central section is provided with output shaft (606), bearing (609) coordinates with output shaft (606), bearing (609) outside is provided with oil sealing (608) and gland (607), and at bearing (609) place set temperature sensor (602), output shaft (606) and input shaft (613) are set to 90 degrees in same level, one end of two output shafts (606), connect Impeller respectively, the other end connects driven wheel of differential (610) by locking nut (611), two driven wheels of differential (610) are all engaged with drive bevel gear (612), drive bevel gear (612) is fixed on input shaft (613) by locking nut (611).
2. motor side external formula one drag two counter-rotating axial fan according to claim 1, is characterized in that: described main frame cylindrical shell (3) is front is provided with slip ring (1), after be provided with noise elimination diffusion barrel (8).
3. motor side external formula one drag two counter-rotating axial fan according to claim 1, it is characterized in that: cooling water connector (604) is connected with water-cooling tube (9), picked out outside main frame cylindrical shell (3) by water-cooling tube (9), be connected with drainage pipeline; Lubricant oil inlet and outlet connectors (605) picks out outside main frame cylindrical shell (3) by pipeline, arranges oil level indicator (12) in main frame cylindrical shell (3) pipeline opening outward.
4. motor side external formula one drag two counter-rotating axial fan according to claim 1, it is characterized in that: the input shaft (613) of transmission case (6) and the output shaft of motor (15), two axial lines is in same plane, and on the same line, on the same line, main frame cylindrical shell (3) inner chamber bottom arranges dunnage for the output shaft (606) of transmission case (6) and the axis of main frame cylindrical shell (3).
5. motor side external formula one drag two counter-rotating axial fan according to claim 1, it is characterized in that: the number of teeth of two driven wheels of differential (610) is identical, the gear ratio of drive bevel gear (612) and driven wheel of differential (610), is greater than 1 or be less than 1 or equal 1.
6. motor side external formula one drag two counter-rotating axial fan according to claim 1, is characterized in that: (14) are provided with dome dish or friction wheel with outside coupling, and dome dish or friction wheel are furnished with break (13).
7. motor side external formula one drag two counter-rotating axial fan according to claim 1, it is characterized in that: between the inner core and urceolus of main frame cylindrical shell (3), arrange some guide vanes (5), all guide vanes (5) connect with guide vane controlling mechanism (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310361415.7A CN103486058B (en) | 2013-08-19 | 2013-08-19 | Motor side external formula one drag two counter-rotating axial fan |
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| CN201310361415.7A CN103486058B (en) | 2013-08-19 | 2013-08-19 | Motor side external formula one drag two counter-rotating axial fan |
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| CN103486058B true CN103486058B (en) | 2016-02-03 |
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| CN111305889B (en) * | 2020-02-21 | 2021-06-22 | 青岛理工大学 | Ventilation system and method for metal mine exploitation |
| CN112642810A (en) * | 2020-12-18 | 2021-04-13 | 张风才 | Motor device with air purging structure |
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