CN102840165B - External cooling fan structure of alternating-current motor and manufacturing method thereof - Google Patents

External cooling fan structure of alternating-current motor and manufacturing method thereof Download PDF

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Publication number
CN102840165B
CN102840165B CN201210324283.6A CN201210324283A CN102840165B CN 102840165 B CN102840165 B CN 102840165B CN 201210324283 A CN201210324283 A CN 201210324283A CN 102840165 B CN102840165 B CN 102840165B
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blade
wheel hub
motor
bearing pin
cooling fan
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CN102840165A (en
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任世瑶
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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  • Motor Or Generator Cooling System (AREA)

Abstract

The invention discloses an external cooling fan structure of an alternating-current motor and a manufacturing method of the external cooling fan structure of the alternating-current motor. The manufacturing method comprises the following steps of: S1, producing a certain number of blades required by cooling of the motor cooling by the same mould, wherein the wing-shaped front section of each blade is in a wing shape, and the back section of each blade is a thin plate shape; S2, cutting rear sections of the blades along the radial directions of the blades according to the capacity of the alternating-current motor; and S3, fixing the blades at the extending part of a rear shaft of a revolving shaft of the motor after the blades obtained in the step S2 are arranged on a hinge pin to be integrally connected with a hub. Compared with the prior art, the external cooling fan structure and the manufacturing method of the external cooling fan structure, disclosed by the invention, not only can further enhance the efficiency of the alternating-current motor, but also can realize multifunction of one mould. The blades produced by the same mould can be used by motors in different capacity, so that the cost can be efficiently reduced.

Description

A kind of Wechselstrommotor external cooling fan structure and manufacture method thereof
Technical field
The present invention relates to a kind of Wechselstrommotor external cooling fan structure and manufacture method thereof.
Background technique
GeneraI investigation finds that three-phase alternating-current motor cooling fan also exists the drawback that operational efficiency is low, power consumption is many, noise is high.Its main cause is that motor adopts centrifugal radial blade fan mostly, for adapting to motor energy spline and reversion, usually the radial centrifugal impeller all adopting efficiency lower, when gas is discharged from impeller, airflow direction is normally radial to flow out, discharge vertically again after motor case becomes axis from radial direction, also exist and turn to sudden change, because systemic effect impact is large, larger flow losses are produced when break-in is flowed, inventor once tested 30kW two-pole machine, and the power consumption recording former fan reaches 1.3kW.And the mould of the cooling fan of a corresponding capacity electrical machinery usually can not be used on the motor of other capacity, therefore different capabilities motor needs different mould, therefore its production cost is higher.
Therefore low and capacity the is corresponding fan mould of the efficiency that exists of the cooling fan of existing Wechselstrommotor can not adapt to the demand of the motor without capacity, the defect that cost is higher.
Summary of the invention
Because the above-mentioned defect of prior art, the first object of the present invention is to provide a kind of manufacture method of Wechselstrommotor external cooling fan structure, it can either improve the efficiency of Wechselstrommotor further, one module multiple usages can be realized again, namely multiple capacity electrical machinery can be provided to use with the blade that same mould is produced, can effectively reduce costs.
The second object of the present invention is to provide a kind of Wechselstrommotor external cooling fan structure, and it improves on the basis of original axial flow wing blade blade structure, can improve the efficiency of Wechselstrommotor further.
Technological scheme of the present invention is as follows:
A manufacture method for Wechselstrommotor external cooling fan structure, comprises the following steps:
S1: produce the blade for Wechselstrommotor cooling requirement with same mould, the aerofoil profile leading portion of described blade is airfoil, and back segment is plate-shaped;
S2: the back segment of capacity to blade along blade radial direction according to Wechselstrommotor cuts off, and the formula of its foundation is as follows:
l i = 4 π P i ρω w i zη C y - - - ( 1 )
Wherein, blade is radially divided into several cross sections, chord length corresponding to each cross section is l i; P ifor the blast in cross section a certain on blade radial; ρ is air density; ω is angular velocity; Z is the number of blade; w ifor the relative velocity in blade a certain cross section diametrically; η is fan efficiency value; C yfor lift coefficient;
S3: after the blade obtained by step S2 is contained in and bearing pin is integrally connected with wheel hub, is fixed on the rear shaft extension place of motor rotary shaft.
Preferably, step S3 comprises further:
S31: radially have a through passage from top to bottom at the leading portion of described blade;
S32 a: bearing pin is inserted this through hole, and the mode of the lower end nut of bearing pin is fixed on wheel hub; Being connected wheel hub by the rear shaft extension place of axle sleeve with the rotating shaft of motor.
Preferably, if the aerofoil profile of blade is symmetrical along profile mean line; If during motor stop, the established angle of blade is β; Then further comprising the steps of:
When motor be oppositely turn time, unclamp bearing pin and wheel hub, make to can be movable relatively between blade and wheel hub; Wire-wound bearing pin in vane airfoil profile is rotated counterclockwise an angle: 180-2 β; And then by bearing pin, blade is retightened on wheel hub.
Preferably, if the aerofoil profile of blade is asymmetrical along profile mean line; If during motor stop, the established angle of blade is β; Then further comprising the steps of:
When motor be oppositely turn time, blade is taken off from wheel hub;
Separately get the stock that in a slice step S1, same mould is produced, after it is intercepted according to the formula (1) in step S2, require blade to be fixed on motor according to turning to of motor.
A kind of Wechselstrommotor external cooling fan structure, comprises wheel hub, axle sleeve, some blades be arranged in axisymmetric mode on wheel hub; Described wheel hub is arranged on motor by axle sleeve, and the leading portion of described vane airfoil profile is airfoil, and back segment is plate-shaped;
Described blade meets following formula in the chord length of radius:
l i = 4 π P i ρω w i zη C y - - - ( 1 )
Wherein, blade is radially divided into several cross sections, chord length corresponding to each cross section is l i; P ifor the blast in cross section a certain on blade radial; ρ is air density; ω is angular velocity; Z is the number of blade; w ifor the relative velocity in blade a certain cross section diametrically; η is fan efficiency value; C yfor lift coefficient;
Preferably, described fan structure, is characterized in that, also comprises bearing pin; The leading portion of each blade radially has a through passage from top to bottom; Described bearing pin inserts this passage, and is fixed on wheel hub; Wheel hub is connected by the rear shaft extension place of axle sleeve with the rotating shaft of motor; Described blade distributes along the even circumferential of wheel hub.
Preferably, the aerofoil profile of described blade is symmetrical along profile mean line.
Preferably, the aerofoil profile of described blade is asymmetrical along profile mean line, and its back segment is curved thin plate shape.
Preferably, described fan structure also comprises fan housing; Described fan housing is arranged on the periphery of fan blade, and the part of its inner corresponding blades suction end is provided with arc diversion division; There is gap in arc diversion division and outer blade diameter place; The inner side of described arc diversion division and the outside of described wheel hub are formed with annular pass; The air-flow that described fan structure produces flows out from annular pass.
Preferably, the blade that described bearing pin is corresponding with it is fixedly connected with, and the mode that the lower end nut of bearing pin is screwed by screw thread is fixed on wheel hub.
Compared with prior art, beneficial effect of the present invention is as follows:
First, the manufacture method of a kind of Wechselstrommotor external cooling fan structure disclosed by the invention, it first produces blade by same mould, and (leading portion is wing blade, back segment is sheet-type), again according to the requirement of different capacity electrical machineries, cutting off of blade is carried out to blade, thus obtain the blade stock meeting different motor capacity requirement, thus realize one module multiple usages, effectively reduce costs; And the efficiency of motor can be improved further according to the blade that the method obtains.
Second, the manufacture method of a kind of Wechselstrommotor external cooling fan structure disclosed by the invention, it is for symmetrical blading and asymmetric blade and provide the adjusting method adapting to only reverse motors, and the cooling fan for stopping reverse motors all can be produced by same mould.
3rd, a kind of Wechselstrommotor external cooling fan structure disclosed by the invention, and improve on the basis of original axial flow wing blade blade structure, leading portion adopts wing blade, and back segment adopts sheet-type; And according to the chord length on the radial direction cross section of the requirement design blade of capacity motor (i.e. airflow pressure) and actual loading size.This kind of structure is applied by inventor first in the cooling fan field of Wechselstrommotor.Radial centrifugal cutter in its hinge structure, the efficiency of motor can be enhanced further.
4th, the present invention also can according to the requirement to the motor of different capabilities and the motor of different load rate, by cutting off blade, to provide suitable airflow value.Energy conservation value to greatest extent can be realized further, there is with short production cycle, that efficiency is high, cost is low particular advantages, can significantly be applicable.
5th, the present invention has one module multiple usages, and cost is economized, with short production cycle, the feature of high efficiency.During for the motor cooling blower test that amount is large, the technology of the present invention can be utilized to refer to different size test model machine, after bearing fruit, then press the blower fan of model blower fan tissue batch production integral rotor.
Accompanying drawing explanation
Fig. 1 is the plan view of the asymmetric blade of a kind of Wechselstrommotor of embodiment of the present invention external cooling fan structure;
Fig. 2 is the longitudinal sectional view of the asymmetric blade of a kind of Wechselstrommotor of embodiment of the present invention external cooling fan structure;
Fig. 3 is a kind of Wechselstrommotor external cooling fan of embodiment of the present invention structural representation;
Fig. 4 is the bearing pin scheme of installation of a kind of Wechselstrommotor external cooling fan of embodiment of the present invention structure;
Fig. 5 is the position view of the corresponding only motor with reciprocating movement of the symmetrical blading of a kind of Wechselstrommotor external cooling fan of embodiment of the present invention structure;
Fig. 6 be a kind of Wechselstrommotor of embodiment of the present invention external cooling fan structure correspondence only motor with reciprocating movement the plan view of asymmetric blade;
Fig. 7 be a kind of Wechselstrommotor of embodiment of the present invention external cooling fan structure correspondence only motor with reciprocating movement the longitudinal sectional view of asymmetric blade;
Fig. 8 is the flow chart of a kind of Wechselstrommotor external cooling fan of embodiment of the present invention structure making process.
Embodiment
Below with the drawings and specific embodiments, the present invention will be further described:
See Fig. 1 to Fig. 4, a kind of Wechselstrommotor external cooling fan structure, comprises wheel hub 200, some blades 100 be arranged in axisymmetric mode on wheel hub; Described wheel hub is sleeved on motor, and the leading portion 11 of blade 100 aerofoil profile is airfoil, and back segment 12 is plate-shaped.
Blade 100 meets following formula in the chord length of radius:
l i = 4 π P i ρω w i zη C y - - - ( 1 )
Wherein, blade is radially divided into several cross sections, chord length corresponding to each cross section is l i; P ifor the blast in cross section a certain on blade radial; ρ is air density; ω is angular velocity; Z is the number of blade; w ifor the relative velocity in blade a certain cross section diametrically; η is fan efficiency value; C yfor lift coefficient.
Length from the end points on the left side to the line of the right end points in Fig. 1 is the chord length l of this position i.
In Fig. 2, sectional view direction is from top to bottom radial direction as referred to herein.The shape indicating ABC tri-end points in Fig. 2 is the part that former rectangle shaped blades is clipped according to formula (1).
Blade 100 shown in Fig. 1 and Fig. 2 is asymmetric, and namely the aerofoil profile of blade is asymmetrical along profile mean line.The thin plate of its back segment is arc the thin plate.Here be only citing, when specifically implementing, blade can be aerofoil profile symmetry, and namely the aerofoil profile of blade is symmetrical along profile mean line.
From Fig. 1 and Fig. 2, can find out, the end of the leading portion of blade 100 radially has a through path 10 from top to bottom.The sidewall side of through hole has three apertures 31,32,33.
See Fig. 3 and Fig. 4, in the present embodiment, described fan structure, also comprises bearing pin 400, axle sleeve 300, fan housing; Bearing pin 400 inserts this path 10, and is fixed by three apertures 31 to 33 and blade 100; And the lower end nut of bearing pin 400 is fixed on wheel hub 200 by the mode that screw thread screws.The center of wheel hub 200 is fixed by the rear shaft extension place of axle sleeve 300 with the rotating shaft of motor; The blade 100 of some (such as 4-8 sheet) distributes along the side of wheel hub 200.The volume cost invention of blade does not make restriction to it.The blade of some can be that to be evenly distributed on equally spacedly on wheel hub also can be non-being equally distributed on wheel hub.
In the present embodiment, the outer side surface of wheel hub 200 has corner all to seamlessly transit in arc-shaped, and the uniform stream that design produces in order to blade like this distributes.
Described fan housing is arranged on the periphery of fan blade, and the part of its inner corresponding blades suction end is provided with arc diversion division; There is less gap in arc diversion division and outer blade diameter place; The value in this gap and the ratio of blade radial length are about 0.05.The inner side of described arc diversion division and the outside of described wheel hub are formed with annular pass; The air-flow that described fan structure produces flows out from annular pass.Here air draught end refers to one end of air flow direction fan blade.The benefit of such design is: the first, makes air-flow evenly can flow into impeller; The second, the gap at arc diversion division and outer blade diameter place be reduced, to reduce flow leakage loss and refluence air quantity.
As Fig. 8, manufacture the method for above-mentioned Wechselstrommotor external cooling fan structure, comprise the following steps:
S1: produce the blade for Wechselstrommotor cooling requirement with same mould, the aerofoil profile leading portion of described blade is airfoil, and back segment is plate-shaped; Blade in step S1 is by the blade stock of pultrusion technological forming.
S2: the back segment of capacity to blade along blade radial direction according to Wechselstrommotor cuts off, and the formula of its foundation is as follows:
l i = 4 π P i ρω w i zη C y - - - ( 1 )
Wherein, blade is radially divided into several cross sections, chord length corresponding to each cross section is l i; P ifor the blast in cross section a certain on blade radial; ρ is air density; ω is angular velocity; Z is the number of blade; w ifor the relative velocity in blade a certain cross section diametrically; η is fan efficiency value; C yfor lift coefficient; It is fixed that blast is come by capacity motor.
S3: after the blade obtained by step S2 is contained in and bearing pin is integrally connected with wheel hub, is fixed on the rear shaft extension place of motor rotary shaft.
Wherein, step S3 comprises further:
S31: radially open a passage from top to bottom at the leading portion of described blade.If make blade by the mode of pultrusion, this passage also can be made into integration when pultrusion blade.
S32 a: bearing pin is inserted this through hole, and the mode of the lower end nut of bearing pin is fixed on wheel hub; Being connected wheel hub by the rear shaft extension place of axle sleeve with the rotating shaft of motor.In the present embodiment, bearing pin is fixed by nut and wheel hub.
The produced blade of said method goes for the motor of spline, reversion, is realized by following steps:
As Fig. 5, if the aerofoil profile of blade is symmetrical along profile mean line; If during motor stop, the established angle of blade is β; Then further comprising the steps of:
When motor be oppositely turn time, unclamp bearing pin and wheel hub, make to can be movable relatively between blade and wheel hub; Wire-wound bearing pin in vane airfoil profile is rotated counterclockwise an angle: 180-2 β; And then by bearing pin, blade is retightened on wheel hub.Now, the sense of rotation of blade and the sense of rotation of motor adapt.
Here established angle refers to the angle between blade center line and sense of rotation.
As Fig. 6 and Fig. 7, for the situation of the non-aerofoil profile symmetrical blading shown in Fig. 1 and Fig. 2; Namely the aerofoil profile of blade is asymmetrical along profile mean line; If during motor stop, the established angle of blade is β; Then further comprising the steps of:
When motor be oppositely turn time, blade is taken off from wheel hub; Separately get the stock that in a slice step S1, same mould is produced, after it is carried out intercepting (contrasting by the part A ' B ' C ' clipped) according to the formula (1) in step S2, require blade to be fixed on motor according to turning to of motor.
Compared with prior art, beneficial effect of the present invention is as follows:
First, the manufacture method of a kind of Wechselstrommotor external cooling fan structure disclosed by the invention, it first produces blade by same mould, and (leading portion is wing blade, back segment is sheet-type), again according to the requirement of different capacity electrical machineries, cutting off of blade is carried out to blade, thus obtain the blade stock meeting different motor capacity requirement, thus realize one module multiple usages, effectively reduce costs; And the efficiency of motor can be improved further according to the blade that the method obtains.
Second, the manufacture method of a kind of Wechselstrommotor external cooling fan structure disclosed by the invention, it is for symmetrical blading and asymmetric blade and provide the adjusting method adapting to only reverse motors, and the cooling fan for stopping reverse motors all can be produced by same mould.
3rd, a kind of Wechselstrommotor external cooling fan structure disclosed by the invention, and improve on the basis of original axial flow wing blade blade structure, leading portion adopts wing blade, and back segment adopts sheet-type; And the chord length of radial direction according to the requirement design blade of capacity motor (i.e. airflow pressure) and actual loading size.This kind of structure is applied by inventor first in the cooling fan field of Wechselstrommotor.Radial centrifugal cutter in its hinge structure, the efficiency of motor can be enhanced further.
4th, the present invention also can according to the requirement to the motor of different capabilities and the motor of different load rate, by cutting off blade, to provide suitable airflow value.Energy conservation value to greatest extent can be realized further, there is with short production cycle, that efficiency is high, cost is low particular advantages, can significantly be applicable.
5th, the present invention has one module multiple usages, and cost is economized, with short production cycle, the feature of high efficiency.During for the motor cooling blower test that amount is large, the technology of the present invention can be utilized to refer to different size test model machine, after bearing fruit, then press the blower fan of model blower fan tissue batch production integral rotor.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all those skilled in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technological scheme of logical analysis, reasoning, or a limited experiment.

Claims (10)

1. a manufacture method for Wechselstrommotor external cooling fan structure, is characterized in that, comprises the following steps:
S1: produce the blade for Wechselstrommotor cooling requirement with same mould, the aerofoil profile leading portion of described blade is airfoil, and back segment is plate-shaped;
S2: the back segment of capacity to blade along blade radial direction according to Wechselstrommotor cuts off, and the formula of its foundation is as follows:
l i = 4 π P i ρω w i zηCy - - - ( 1 )
Wherein, blade is radially divided into several cross sections, chord length corresponding to each cross section is l i; P ifor the blast in cross section a certain on blade radial; ρ is air density; ω is angular velocity; Z is the number of blade; w ifor the relative velocity in a certain cross section of blade; η is fan efficiency value; C yfor lift coefficient;
S3: after the blade obtained by step S2 is contained in and bearing pin is integrally connected with wheel hub, is fixed on the rear shaft extension place of motor rotary shaft.
2. method according to claim 1, is characterized in that, step S3 comprises further:
S31: radially have a through passage from top to bottom at the leading portion of described blade;
S32 a: bearing pin is inserted this passage, and the mode of the lower end nut of bearing pin is fixed on wheel hub; Wheel hub is connected by the rear shaft extension place of axle sleeve with the rotating shaft of motor.
3. method according to claim 2, is characterized in that, if the aerofoil profile of blade is symmetrical along profile mean line; If when motor rotates forward, the established angle of blade is β; Then further comprising the steps of:
When motor oppositely turns, unclamp bearing pin, make to can be movable relatively between blade and wheel hub; Wire-wound bearing pin in vane airfoil profile is rotated counterclockwise an angle: 180-2 β; And then by bearing pin, blade is retightened on wheel hub.
4. method according to claim 2, is characterized in that, if the aerofoil profile of blade is asymmetrical along profile mean line; If when motor rotates forward, the established angle of blade is β; Then further comprising the steps of:
When motor oppositely turns, blade is taken off from wheel hub;
Separately get the blade stock that in a slice step S1, same mould is produced, after it is intercepted according to the formula (1) in step S2, require blade to be fixed on motor according to turning to of motor.
5. a Wechselstrommotor external cooling fan structure, is characterized in that, comprises wheel hub, axle sleeve, some blades be arranged in axisymmetric mode on wheel hub; Described wheel hub is arranged on motor by axle sleeve, and the leading portion of described vane airfoil profile is airfoil, and back segment is plate-shaped;
Described blade meets following formula in the chord length of radius:
l i = 4 π P i ρω w i zηCy - - - ( 1 )
Wherein, blade is radially divided into several cross sections, chord length corresponding to each cross section is l i; P ifor the blast in cross section a certain on blade radial; ρ is air density; ω is angular velocity; Z is the number of blade; w ifor the relative velocity in blade a certain cross section diametrically; η is fan efficiency value; C yfor lift coefficient;
6. fan structure according to claim 5, is characterized in that, also comprises bearing pin; The leading portion of each blade radially has a through passage from top to bottom; Described bearing pin inserts this passage, and is fixed on wheel hub; Wheel hub is connected by the rear shaft extension place of axle sleeve with the rotating shaft of motor; Described blade distributes along the even circumferential of wheel hub.
7. the structure according to claim 5 or 6, is characterized in that, the aerofoil profile of described blade is symmetrical along profile mean line.
8. the structure according to claim 5 or 6, is characterized in that, the aerofoil profile of described blade is asymmetrical along profile mean line, and its back segment is curved thin plate shape.
9. structure according to claim 5, is characterized in that, also comprises fan housing; Described fan housing is arranged on the periphery of fan blade, and the part of its inner corresponding blades suction end is provided with arc diversion division; There is gap in arc diversion division and outer blade diameter place; The inner side of described arc diversion division and the formation annular pass, outside of described wheel hub; The air-flow that described fan structure produces flows out from annular pass.
10. fan structure according to claim 6, is characterized in that, the blade that described bearing pin is corresponding with it is fixedly connected with, and the mode that the lower end nut of bearing pin is screwed by screw thread is fixed on wheel hub.
CN201210324283.6A 2012-09-04 2012-09-04 External cooling fan structure of alternating-current motor and manufacturing method thereof Expired - Fee Related CN102840165B (en)

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CN102840165B true CN102840165B (en) 2015-06-17

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11289716A (en) * 1998-04-03 1999-10-19 Mitsubishi Electric Corp Cooling fan for electric motor
JP2002242887A (en) * 2001-02-19 2002-08-28 Japan Servo Co Ltd Axial fan
CN201122877Y (en) * 2007-12-10 2008-09-24 锦州汉拿电机有限公司 Cooling fan of alternating-current generator for automobile

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5026010B2 (en) * 2006-07-19 2012-09-12 デンヨー株式会社 Cooling fan for rotating equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11289716A (en) * 1998-04-03 1999-10-19 Mitsubishi Electric Corp Cooling fan for electric motor
JP2002242887A (en) * 2001-02-19 2002-08-28 Japan Servo Co Ltd Axial fan
CN201122877Y (en) * 2007-12-10 2008-09-24 锦州汉拿电机有限公司 Cooling fan of alternating-current generator for automobile

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