CN106640759A

CN106640759A - Axial-flow type fan

Info

Publication number: CN106640759A
Application number: CN201611148978.8A
Authority: CN
Inventors: 易正清; 马列
Original assignee: Midea Group Co Ltd; GD Midea Environment Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Environment Appliances Manufacturing Co Ltd
Priority date: 2016-12-13
Filing date: 2016-12-13
Publication date: 2017-05-10

Abstract

The invention relates to the field of axial-flow type fans, and provides an axial-flow type fan. The axial-flow type fan comprises a hub and multiple fan blades which are arranged on the hub in the circumferential direction, and tilting parts which tilt towards the axial-flow direction are formed in the blade tip parts of the fan blades. Through the arrangement of the tilting parts which tilt forward on the fan blades, pressure in the blade tip areas of the front sides of the fan blades can be elevated and a high hydrostatic pressure area is formed, so that on the pressure surface of the fan blades, more airflow firstly flows to the center of the fan blades, then breaks away from the fan blades and forms a wind cone, and in the middle part of the wind cone, the airflow velocity can be higher, and the air supplying distance can be longer.

Description

Tube-axial fan

Technical field

The present invention relates to tube-axial fan field, more particularly to a kind of air supplying distance tube-axial fan farther out.

Background technology

Tube-axial fan is exactly can to produce the approximately axially equidirectional air-flow with fan blade, and tube-axial fan is because of flow Greatly, pressure head is low, often in electric fan, outdoor machine of air-conditioner fan etc. as blower part.

As shown in figure 1, adopting continuous curve surface moulding, this design to make the pressure face of existing Axial-flow Fan 3 more The air-flow that aerofoil fan is sent has stronger directionality, more uniform wind speed profile, and the air-flow of the axial flow direction also has Thus certain taper, i.e. fraction can reduce the wind speed of central gas stream at an angle to external diffusion, air supplying distance compared with It is short.

The content of the invention

The present invention is to solve the existing technical problem that tube-axial fan wind speed is little, air supplying distance is short.

To solve above-mentioned technical problem, the invention provides a kind of tube-axial fan, the fan includes wheel hub and multiple weeks To the flabellum being arranged on the wheel hub, the blade tip of the flabellum is formed in part with rake inclined to axial flow direction.

Preferably, on the direction of the leading edge by the flabellum to trailing edge, the width of the rake gradually increases.

Preferably, the rake is located at 0.5～0.95 sesquialter of the flabellum near one end of the trailing edge of the flabellum At path position.

Preferably, the rake is located at 0.5～1.0 times of radius of the flabellum near one end of the leading edge of the flabellum At position.

Preferably, the rake inclines 0 °～90 ° to axial flow direction.

Preferably, the rake is the kink of the blade tip part for being formed at the flabellum.

Preferably, the rake is globoidal structure, planar structure or waveform curved-surface structure.

Preferably, the rake is detachably connected with the main part of the flabellum.

Preferably, the adjustable angle between the main part of the rake and the flabellum.

Preferably, on axial flow direction, the front side of the rake forms pressure surface.

A kind of tube-axial fan that the present invention is provided, by arranging the rake for turning forward in the blade tip part of flabellum, The blade tip areal pressure on front side of flabellum can be made to raise, form high static pressure area, make more air-flows on flabellum pressure face first to flabellum Central authorities' flowing, then depart from blade-shaped and become a common practice cone so that wind bore in the middle part of air velocity is higher, air supplying distance is farther.

Description of the drawings

Fig. 1 is the structural representation of the tube-axial fan of prior art；

Fig. 2 is the axis side view at the front side visual angle of the tube-axial fan of the embodiment of the present invention；

Fig. 3 is the axis side view at the rear side visual angle of the tube-axial fan of the embodiment of the present invention；

Fig. 4 is the schematic diagram of the wind cone angle of the embodiment of the present invention；

Fig. 5 is the schematic diagram of the distributional pattern of the rake of the embodiment of the present invention；

Fig. 6 is C-C in Fig. 5 to sectional view.

Reference：

1st, tube-axial fan；2nd, wheel hub；3rd, flabellum；31st, leading edge；32nd, trailing edge；33rd, blade tip part；34th, pressure face；35、 Suction surface；A, wind cone angle；A, rake are near one end of the trailing edge of the flabellum；B, rake are near the leading edge of the flabellum One end；The external diameter of D, flabellum；D₁, rake near the trailing edge of the flabellum one end place circumference；D₂, rake is near described One end place circumference of the leading edge of flabellum；β_i, the sweptback angle of rake.

Specific embodiment

With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Hereinafter implement Example is not limited to the scope of the present invention for illustrating the present invention.

In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " connection " should do Broadly understood, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected；Can be joined directly together, Can also be indirectly connected to by intermediary.For the ordinary skill in the art, can understand above-mentioned with concrete condition Term concrete meaning in the present invention.

With reference to shown in Fig. 2 and Fig. 3, a kind of tube-axial fan 1 provided in an embodiment of the present invention, including wheel hub 2 and multiple weeks To arrangement flabellum 3 on the hub 2, wheel hub 2 is rotated by motor, and multiple flabellums 3 preferably uniformly divide in the circumference of wheel hub 2 Cloth, quantity can be three, and each flabellum 3 distorts from the inside to the outside shape in curved surface, when wheel hub 2 has driven rotation, in flabellum 3 Front side form pressure face 34, form suction surface 35 in the rear side of flabellum 3 so that air is generally axially flowed by before rear, Flow along axial flow direction, in conjunction with shown in Fig. 4, the air-flow also has certain wind cone angle a, wind cone of supplying gas is constituted, with to one Determine scope formation to brush.

Region near the radial outer end of flabellum 3 is blade tip part 33, on the direction of rotation, distance rotation on flabellum 3 Turn center it is farthest a little before a lateral edges for flabellum 3 leading edge 31, and be located at this apart from pivot it is farthest a bit A lateral edges afterwards are the trailing edge 32 of flabellum 3, and in the present embodiment, on axial flow direction, the blade tip part 33 of flabellum 3 is formed There is the rake for turning forward, the setting of the rake can make the pressure rise of the blade tip part 33 of the front side of flabellum 3, form high Static pressure area, makes on flabellum pressure face 34 more air-flows first to central authorities' flowing of flabellum, then departs from blade-shaped and become a common practice cone, so that wind Air velocity in the middle part of cone is higher, air supplying distance is farther.

The front side of the rake also forms pressure surface in blade tip part 33, i.e. when blade rotates with wheel hub 2, the inclination The front side in portion constitutes windward side at the trailing edge 32 of blade tip part 33, is consequently formed zone of positive pressure, so can further improve wind Air velocity, increase air supplying distance in the middle part of cone.

Wherein, on the direction of the leading edge 31 by the flabellum 3 to trailing edge 32, the width of rake can be gradually to increase Plus, so on the one hand preferably pressure distribution can be obtained, make the edge that wind is bored form stable air-flow；On the other hand can be with The rear side in rake is avoided to form vortex, such that it is able to reduce noise.

In conjunction with shown in Fig. 5 and Fig. 6, the sweptback angle beta of rake_iCan be 5 °～90 °, i.e. rake at least should Tilt backwards 5 °, can so give play to the effect of relatively effective reduction wind cone angle a, and rake tilt backwards 5 °～ 90 ° can produce beneficial effect to reducing wind cone angle a to varying degrees.

Rake is located at 0.5～0.95 times of radial position of flabellum 3 near one end of the trailing edge 32 of flabellum 3, and inclines Portion is located at 0.5～1.0 radial position of flabellum 3 near one end of the leading edge 31 of flabellum 3, that is to say, that if by flabellum 3 External diameter is defined as D, and the diameter of wheel hub 2 is defined as d, sets radius R of (D-d)/2 for flabellum 3₁, the beginning bending of 3 trailing edge of flabellum 32 Position A be located circle diameter be defined as D₁, then have (D₁- d)/2=(0.5～0.95) R₁；If the leading edge 31 of flabellum 3 is started The circle diameter that the position B of bending is located is defined as D₂, then have (D₂- d)/2=(0.5～1.0) R₁。

Rake can be formed at the blade tip area of the kink of the blade tip part 33 of flabellum 3, the i.e. rake by flabellum 3 Domain is bent to form, and kink is preferably cambered surface transition and is connected with the main part of flabellum 3, and the main part of the flabellum 3 is The part of the non-run-off the straight of endocyclic area of flabellum 3, the endocyclic area refers to the region within D1, can so avoid generation larger Noise, can also avoid knee from the phenomenon of stress concentration occur.

Certainly, rake can also be that the main part for being removably connected to flabellum 3, i.e. rake can be connected by bolt The mode such as connect to be detachably connected with the main part of fan.

In addition, rake can also be and adjustable angle between the main part of flabellum 3 structure, i.e. rake is relative Be in the inclined angle of the main part of flabellum 3 it is transformable, for example, can be by between the main part of rake and flabellum 3 Relative angle be set to several gears, when needing to obtain less wind cone angle a, optionally by rake relative to flabellum The angle that 3 main part turns forward is turned down, on the contrary then by rake relative to flabellum 3 the sweptback angle of main part Degree is tuned up；And when wind cone angle a need not be reduced, can by rake relative to the angle of the main part of flabellum 3 turn down to 0 °, i.e. rake not run-off the straight at this moment；Can also even be set to rake can be to the back sweep of flabellum 3, with this To expand wind cone angle a.

The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, on the premise of without departing from the technology of the present invention principle, some improvement and replacement can also be made, these improve and replace Also should be regarded as protection scope of the present invention.

Claims

1. a kind of tube-axial fan, including wheel hub and multiple flabellums being circumferentially arranged on the wheel hub, it is characterised in that described The blade tip of flabellum is formed in part with rake inclined to axial flow direction.

2. tube-axial fan according to claim 1, it is characterised in that in the direction of the leading edge by the flabellum to trailing edge On, the width of the rake gradually increases.

3. tube-axial fan according to claim 1, it is characterised in that the rake is near the trailing edge of the flabellum One end is located at 0.5～0.95 times of radial position of the flabellum.

4. tube-axial fan according to claim 9, it is characterised in that the rake is near the leading edge of the flabellum One end is located at 0.5～1.0 times of radial position of the flabellum.

5. tube-axial fan according to claim 1, it is characterised in that the rake to axial flow direction incline 0 °～ 90°。

6. tube-axial fan according to claim 1, it is characterised in that the rake is the leaf for being formed at the flabellum The kink of taper point.

7. tube-axial fan according to claim 1, it is characterised in that the rake is globoidal structure, planar structure Or waveform curved-surface structure.

8. tube-axial fan according to claim 1, it is characterised in that the main part of the rake and the flabellum It is detachably connected.

9. tube-axial fan according to claim 1, it is characterised in that the main part of the rake and the flabellum Between adjustable angle.

10. the tube-axial fan according to any one of claim 1 to 8, it is characterised in that described to incline on axial flow direction The front side of inclined portion forms pressure surface.