CN110500307A

CN110500307A - Noise reducing type high speed small size axial flow blower

Info

Publication number: CN110500307A
Application number: CN201910880876.2A
Authority: CN
Inventors: 王文星; 徐新康
Original assignee: Zhejiang Weijie Intelligent Technology Co Ltd
Current assignee: Zhejiang Weijie Intelligent Technology Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2019-11-26

Abstract

The invention discloses a kind of noise reducing type high speed small size axial flow blowers, including air duct (1), rotor assembly (2) and stator module (3) are equipped in air duct (1), the wind inlet end of air duct (1) is equipped with the impeller (4) connecting with rotor assembly (2), the rotor assembly (2) includes shaft (21), a pair of of spring bearing (22) are successively arranged along the blower direction that becomes a mandarin in shaft (21), magnet steel (24) and an auxiliary bearing (25), a pair of of spring bearing (22) is connected with the steel bushing in air duct (1), spring (23) are equipped between a pair of of spring bearing (22), auxiliary bearing (25) is connected with stator module (3).The advantages of present invention has the radial vibration that generates in high revolving speed operational process of rotor assembly small, and operation stability is high, structural vibration noise is small, stator-rotor interaction is small between impeller and axial guide vane, plays good noise reduction effect, long service life.

Description

Noise reducing type high speed small size axial flow blower

Technical field

The present invention relates to a kind of axial flow blower, especially a kind of noise reducing type high speed small size axial flow blower.

Background technique

Increasingly minimize in brushless motor, lightweight and high speed it is current, with the matched efficient axial-flow wind of high revolving speed Machine is seldom, and especially diameter is below in 100mm, releases in products such as high-speed air blower motor, bladeless fan, curling irons Afterwards, the exploitation of household electric appliances small-medium size axial flow blower and high-speed DC brushless electric machine just gradually starts.For small size axis stream Blower, impeller are directly installed on motor shaft, conventional that rotor is supported using 2 bearings, and bearing side is impeller, and bearing is another Side is magnet steel (common Nd-Fe-B magnet steel), and due to high-power and minor diameter demand, magnet steel is generally all more elongated, therefore can not Will appear with avoiding, the length of the corresponding magnet steel side (load-side) in the cantilever part of shaft is always far longer than impeller side length, And the side is because of the bending far from supporting point and shaft, resulting in magnet steel is radially having bigger a vibration velocity and displacement. Small size axial flow blower is widely used in the small household appliances such as hair dryer, and the requirement for noise is more harsh, and motor turns The support construction of son is to influence the key factor of motor oscillating and noise, and under high revolving speed, the small radial vibration of motor also can be right High frequency noise has very big influence, especially small to magnetic gap, the opposite variation up to 15% or more of flux density motor.

When the noise reduction for considering axial flow blower improves, current motor R&D and production both domestic and external enterprise is generally conceived to blower Inner body assembles the improvement of compactness, and few for the research of fan air guide structure, and the improvement of air guide structure is to blower Noise reduction equally has excellent results, and the air guide structure of axial flow blower is mainly the fit structure of air duct inner impeller and axial guide vane, When the blade of axial flow fan vane wheel is in different location, tail is affected to downstream axial guide vane, and different goes out to flow The distribution of angle can make axial guide vane intake uniformity be deteriorated, and the exclusion of axial guide vane, and influence impeller blade in turn Go out to flow, the interference between movable vane piece and stator blade will lead to rising quickly for sound pressure level at blade passing frequency, be embodied in wind Machine can issue bigger more squeal-noise when running, especially between the two away from the case where small.

Therefore, a kind of high speed small size axial flow blower of low noise is needed, to meet the needs of high-end household electrical appliances market.

Summary of the invention

The object of the present invention is to provide a kind of noise reducing type high speed small size axial flow blowers.It has rotor assembly in height The radial vibration generated in revolving speed operational process is small, and operation stability is high, structural vibration noise is small, between impeller and axial guide vane The advantages of stator-rotor interaction is small, plays good noise reduction effect, long service life.

Technical solution of the present invention: noise reducing type high speed small size axial flow blower, including air duct, air duct is interior to be equipped with rotor assembly And stator module, the wind inlet end of air duct are equipped with the impeller connecting with rotor assembly, the rotor assembly includes shaft, edge in shaft The blower direction that becomes a mandarin is successively arranged a pair of of spring bearing, magnet steel and an auxiliary bearing, the steel in a pair of of spring bearing and air duct Set is connected, and spring is equipped between a pair of of spring bearing, and auxiliary bearing is connected with stator module.

In noise reducing type high speed small size axial flow blower above-mentioned, the stator module includes three groups end to end fixed two-by-two Subelement, stator unit are the integrated injection molding structure of skeleton and iron core, and skeleton is connected with contact pin, and auxiliary bearing is mutually glued with skeleton Even.

In noise reducing type high speed small size axial flow blower above-mentioned, the auxiliary bearing is identical as the internal diameter of spring bearing, auxiliary The outer diameter of bearing is helped to be less than or equal to the outer diameter of spring bearing.

In noise reducing type high speed small size axial flow blower above-mentioned, the intermediate point of the pair of spring bearing to magnet steel center of gravity institute Axial distance between points is the intermediate point of a pair of of spring bearing to the 1.4-2.5 of axial distance between impeller center of gravity point Times.

In noise reducing type high speed small size axial flow blower above-mentioned, between the both ends of the spring and the contact surface of spring bearing Equipped with gasket.

In noise reducing type high speed small size axial flow blower above-mentioned, the outside of the impeller, which is equipped with, is connected with the rotating shaft balance Block.

In noise reducing type high speed small size axial flow blower above-mentioned, if being provided with dry plate along air axial flow direction in the air duct It is distributed axial guide vane in a ring；The section that becomes a mandarin of the axial direction guide vane is arc-shaped guide plate, and outlet flow section is flat guide plate, arc-shaped guide plate End is formed with cutting tip, cutting tip orthographic projection in the plane where flat guide plate be formed by projection angle between 40°-60°。

In noise reducing type high speed small size axial flow blower above-mentioned, the axial direction guide vane includes first axis guide vane and the second axis To guide vane, every the axial guide vane of two panels first axis guide vane arrangement a piece of second, it is prominent that the tail portion of the second axial guide vane is equipped with wedge shape It rises, wedge-shaped projection is equipped with locating slot.

In noise reducing type high speed small size axial flow blower above-mentioned, the axial direction guide vane becomes a mandarin between section and outlet flow section by putting down The transition of slip circle face.

In noise reducing type high speed small size axial flow blower above-mentioned, the impeller includes wheel hub, on the lateral wall of wheel hub uniformly Symmetrical airfoil blade is distributed with, is equipped with gap between the blade root of adjacent symmetric airfoil fan.

Compared with prior art, the present invention uses three bearing arrangements, is successively arranged a pair along the blower direction that becomes a mandarin in shaft Spring bearing, magnet steel and an auxiliary bearing, it is generally all more elongated for small size axial flow blower magnet steel, it is easy because of rotation weight The offset of the heart causes magnet steel radially having bigger vibration velocity and displacement this point, the present invention to add in the magnet steel other side Auxiliary bearing give shaft and preferably support, reduce the radial vibration that rotor assembly generates in high revolving speed operational process, mention The stability of height operation, while the noise generated by structural vibration is also reduced, and structural vibration is small reduces in another level Because of the mechanical loss that vibration generates, facilitate the service life for extending blower.

In order to install newly-increased auxiliary bearing, the present invention is also made that the structure of stator module and is correspondingly improved, stator Component includes three groups of end to end stator units two-by-two, forms one between shaft after stator unit assembling and is used for asessory shaft The annular space of installation is held, stator unit is specially the integrated injection molding structure of skeleton and iron core, auxiliary bearing outer ring and skeleton phase Stable installation is realized in adhesion, while skeleton has certain bradyseism effect, can be effective while improving rotating shaft support performance The vibration for reducing external air duct, plays the effect of noise reduction.

Axial guide vane of the invention be become a mandarin the arc-shaped guide plate of section, outlet flow section be in flat guide plate structure, arc-shaped guide plate End is formed with cutting tip, and cutting tip is the structure to axial guide vane end after cutting and shape change, and widens The distance between impeller and axial guide vane, under conditions of sacrificing partial pneumatic performance, reduce the interference between rotor and stator blade, Finally make axial guide vane air inlet uniformity, reduces the acoustic pressure at blade passing frequency, play noise reduction effect；Cutting tip is flat Orthographic projection is formed by projection angle between 40 ° -60 ° in plane where the guide plate of face, and axial flow blower is enable to reach in aeroperformance It is smaller that noise content is generated under the premise of target；Impeller is symmetrical airfoil blade, does not interlock between adjacent blades, ensure that blade in low thunder Excellent pneumatic property under promise number, while but also impeller air inlet uniformity, slows down the stator-rotor interaction between axial guide vane, can also have Effect extends the service life of impeller itself and axial guide vane.

In addition, auxiliary bearing, under the premise of internal diameter is identical with spring bearing, outer diameter is less than or equal to the outer of spring bearing Diameter, convenient for the differentiation of two kinds of bearings during the installation process；Spring, both ends of the spring and spring bearing are equipped between a pair of of spring bearing Contact surface between be equipped with gasket, the axial vibration that rotor assembly generates in high revolving speed operational process can be effectively reduced, rise To the effect of noise reduction；The outside of impeller, which is equipped with, is connected with the rotating shaft balance weight, improves balance when wheel rotation, reduces impeller Vibration reduces noise content.

To sum up, the radial vibration that there is the present invention rotor assembly to generate in high revolving speed operational process is small, operation stability It is high, structural vibration noise is small, stator-rotor interaction is small between impeller and axial guide vane, play good noise reduction effect, long service life The advantages of.

Detailed description of the invention

Fig. 1 is structural schematic diagram of the invention；

Fig. 2 is three-dimensional configuration schematic diagram of the invention；

Fig. 3 is schematic view of the mounting position of the spring bearing in air duct；

Fig. 4 is schematic view of the mounting position of the auxiliary bearing on stator module；

Fig. 5 is the structural schematic diagram of stator unit；

Fig. 6 is the structural schematic diagram of air duct；

Fig. 7 is the arrangement mode schematic diagram of axial guide vane；

Fig. 8 is the structural schematic diagram of impeller；

Fig. 9 is the structural schematic diagram of first axis guide vane；

Figure 10 is the structural schematic diagram of the second axial guide vane；

Figure 11 is the lateral plan of air duct；

Figure 12 is the relation schematic diagram of the noise sound at cutting tip corner dimension and blade passing frequency.

Appended drawing reference: 1- air duct, 2- rotor assembly, 3- stator module, 4- impeller, 21- shaft, 22- spring bearing, 23- Spring, 24- magnet steel, 25- auxiliary bearing, 26- gasket, 27- balance weight, 31- stator unit, 311- skeleton, 312- iron core, 313- Contact pin, 11- axial direction guide vane, 12- cutting tip, 111- first axis guide vane, the axial guide vane of 112- second, 113- wedge-shaped projection, 114- locating slot, 41- wheel hub, 42- symmetrical airfoil blade.

Specific embodiment

The present invention is further illustrated with reference to the accompanying drawings and examples, but be not intended as to the present invention limit according to According to.

Embodiment: noise reducing type high speed small size axial flow blower, structure is as shown in Figure 1 to 11, including air duct 1, in air duct 1 Equipped with rotor assembly 2 and stator module 3, the wind inlet end of air duct 1 is equipped with the impeller 4 connecting with rotor assembly 2, the rotor assembly 2 include shaft 21, is successively arranged a pair of of spring bearing 22, magnet steel 24 and an auxiliary bearing along the blower direction that becomes a mandarin in shaft 21 25, a pair of of spring bearing 22 is connected with the steel bushing in air duct 1, and spring 23, auxiliary bearing are equipped between a pair of of spring bearing 22 25 are connected with stator module 3.

The stator module 3 includes three groups of end to end stator units 31 two-by-two, and stator unit 31 is skeleton 311 and iron The integrated injection molding structure of core 312, skeleton 311 are connected with contact pin 313, and the outer ring glue and 311 phase of skeleton of auxiliary bearing 25 are viscous Even.

Three groups form one between shaft 21 after end to end stator unit 31 assembles two-by-two and are used for auxiliary bearing 25 The annular space of installation, the annular space on skeleton 311, shape are not limited to annular or cylindrical, it is only necessary to can accommodate auxiliary Bearing 25 or part auxiliary bearing 25 are helped, because auxiliary bearing 25 is directly fixed by binder with skeleton 311, bonding Agent can be exposed on skeleton 311.

The auxiliary bearing 25 is identical as the internal diameter of spring bearing 22, and the outer diameter of auxiliary bearing 25 is less than or equal to spring bearing 22 outer diameter, convenient for the differentiation between two kinds of bearings.

The intermediate point of the pair of spring bearing 22 to the axial distance between 24 center of gravity point of magnet steel is a pair of of support The intermediate point of bearing 22 is to 1.7 times of axial distance between 4 center of gravity point of impeller.

Gasket 26 is equipped between 23 both ends of spring and the contact surface of spring bearing 22.

The outside of the impeller 4 is equipped with the balance weight 27 connecting with shaft 21.

If air axial flow direction is provided with dry plate in the air duct 1 is distributed axial guide vane 11 in a ring, there is steel in air duct 1 Set, axial guide vane 11 are specifically mounted between 1 inner wall of steel bushing outer wall and air duct；The section that becomes a mandarin of the axial direction guide vane 11 is arc Guide plate, outlet flow section are flat guide plate, and the end of arc-shaped guide plate is formed with cutting tip 12, and cutting tip 12 is where flat guide plate Plane in orthographic projection be formed by projection angle at 40 ° -60 °, cutting tip 12 as shown in figure 9, namely entering along air Stream axis of orientation is gradually increased to the width of guide vane 11.

The axial direction guide vane 11 includes first axis guide vane 111 and the second axial guide vane 112, every two panels first axle guide Leaf 111 arranges a piece of second axial guide vane 112, and the tail portion of the second axial guide vane 112 is equipped with wedge-shaped projection 113, wedge-shaped projection 113 It is equipped with locating slot 114, for installing stator module 3.

Becoming a mandarin between section and outlet flow section by smooth cambered surface transition for the axial direction guide vane 11, guarantees that air-flow is flowing through axial lead Air turbulence phenomenon does not occur during leaf 11.

The impeller 4 includes wheel hub 41, is evenly distributed with symmetrical airfoil blade 42, adjacent symmetric on the lateral wall of wheel hub 41 Gap is equipped between the blade root of airfoil fan 42 namely each adjacent symmetric airfoil fan 42 does not interlock, ensure that symmetrical wing The pneumatic property excellent under low reynolds number of type blade 42.

The air duct 1 includes the steel bushing at center, and the outer ring of glue adhesion a pair of spring bearing 22 is used inside steel bushing.

24 installation site of magnet steel of the rotor assembly 2 is corresponding with inside and outside 312 position of iron core of stator module 3.

(40 ° -60 °) of wedge angle size of the cutting tip 12 are to obtain through test, by different cuttings and the axis of figure Test to Guide fan, as shown in figure 12, for partly disappear room blower with test comparison under revolving speed at horizontal fan distance 1m Sound pressure level comparison, arrange the orthographic projection in the plane where flat guide plate of cutting tip 12 is formed by projection angle and leaf Piece is as follows: by the noise sound at frequency

Angle (°)	Noise sound (dBA) at blade passing frequency
		0	68.2
10	67.3
		20	66.4
30	66.1
		40	65.3
45	64.6
		60	60.3

As seen from the above table, when the wedge angle of axial guide vane cutting tip 12 can reduce at blade passing frequency at 40 ° or more 3 decibels of sound pressure level or more, when greater than 60 degree, there is no too big variations for noise, and noise content is smaller (≤60.3dBA), consider To the excessive aeroperformance for influencing axial guide vane 11 overall weight and blower of wedge angle, thus the present invention only test to wedge angle be 60 ° when Noise content, the present invention take the orthographic projection in the plane where flat guide plate of cutting tip 12 be formed by projection angle between 11 structure of axial guide vane at 40 ° -60 °, the noise content≤65.3dBA generated at this time meet drop of the present invention in tolerance interval The design requirement made an uproar.

When the invention works, 2 high-speed rotation of rotor assembly, the driving rotation air inlet of impeller 4, a pair of of support of 24 side of magnet steel Bearing 22 is used to support shaft 21, due to a pair of of spring bearing 22 intermediate point between 24 center of gravity point of magnet steel it is axial away from From the intermediate point much larger than a pair of of spring bearing 22 to the axial distance between 4 center of gravity point of impeller, 24 other side of magnet steel One auxiliary bearing 25 plays the role of Auxiliary support, while greatly reducing the vibration in the radial direction of magnet steel 24, decreases and makes an uproar The generation of sound.

Claims

1. noise reducing type high speed small size axial flow blower, including air duct (1), air duct (1) is interior to be equipped with rotor assembly (2) and stator module (3), the wind inlet end of air duct (1) is equipped with the impeller (4) connecting with rotor assembly (2), it is characterised in that: the rotor assembly (2) Including shaft (21), a pair of of spring bearing (22), magnet steel (24) and one are successively arranged along the blower direction that becomes a mandarin in shaft (21) Auxiliary bearing (25), a pair of of spring bearing (22) are connected with the steel bushing in air duct (1), are equipped between a pair of of spring bearing (22) Spring (23), auxiliary bearing (25) are connected with stator module (3).

2. noise reducing type high speed small size axial flow blower according to claim 1, it is characterised in that: the stator module (3) Including three groups, end to end stator unit (31), stator unit (31) are skeleton (311) and the one note of iron core (312) two-by-two Structure is moulded, skeleton (311) is connected with contact pin (313), auxiliary bearing (25) and skeleton (311) phase adhesion.

3. noise reducing type high speed small size axial flow blower according to claim 1, it is characterised in that: the auxiliary bearing (25) Identical as the internal diameter of spring bearing (22), the outer diameter of auxiliary bearing (25) is less than or equal to the outer diameter of spring bearing (22).

4. noise reducing type high speed small size axial flow blower according to claim 1,2 or 3, it is characterised in that: the pair of branch Intermediate point to the axial distance between magnet steel (24) center of gravity point for supportting bearing (22) is the centre of a pair of of spring bearing (22) It puts to 1.4-2.5 times of axial distance between impeller (4) center of gravity point.

5. noise reducing type high speed small size axial flow blower according to claim 1, it is characterised in that: spring (23) both ends Gasket (26) are equipped between the contact surface of spring bearing (22).

6. noise reducing type high speed small size axial flow blower according to claim 1, it is characterised in that: outside the impeller (4) Side is equipped with the balance weight (27) connecting with shaft (21).

7. noise reducing type high speed small size axial flow blower according to claim 1, it is characterised in that: the interior edge of the air duct (1) If air axial flow direction is provided with dry plate is distributed axial guide vane (11) in a ring；The section that becomes a mandarin of the axial direction guide vane (11) is arc Guide plate, outlet flow section are flat guide plate, and the end of arc-shaped guide plate is formed with cutting tip (12), and cutting tip (12) is in flat guide plate Orthographic projection is formed by projection angle between 40 ° -60 ° in the plane at place.

8. noise reducing type high speed small size axial flow blower according to claim 7, it is characterised in that: the axial direction guide vane (11) Including first axis guide vane (111) and the second axial guide vane (112), every two panels first axis guide vane (111) arrangement a piece of the The tail portion of two axial guide vanes (112), the second axial guide vane (112) is equipped with wedge-shaped projection (113), and wedge-shaped projection (113) is equipped with Locating slot (114).

9. noise reducing type high speed small size axial flow blower according to claim 7, it is characterised in that: the axial direction guide vane (11) Become a mandarin between section and outlet flow section by smooth cambered surface transition.

10. noise reducing type high speed small size axial flow blower according to claim 1, it is characterised in that: the impeller (4) includes Wheel hub (41) is evenly distributed with symmetrical airfoil blade (42) on the lateral wall of wheel hub (41), adjacent symmetric airfoil fan (42) Gap is equipped between blade root.