CN101012839A

CN101012839A - Axial-flow windwheel

Info

Publication number: CN101012839A
Application number: CN 200710026747
Authority: CN
Inventors: 游斌; 伍光辉; 程志明; 向运明
Original assignee: Guangdong Midea Electric Appliances Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2007-01-31
Filing date: 2007-01-31
Publication date: 2007-08-08
Anticipated expiration: 2027-01-31
Also published as: CN100465458C

Abstract

An axial-flow wind wheel comprises three blades set on a hub, wherein, the end area of the blades is dishing toward to the costal air-in direction; the three blades use the rotary central axis of the wind wheel as center each other and they allocate equal-spaced or unequal-spaced in the 120degree+-15degree. The external diameter of the axial-flow is defined as D2, the hub diameter is defined as D1, the height of the blade Rm is defined as (D2-D1)/2, the circumference diameter in which there is the beginning dishing place A is defined as D3, (D3-D1)/2=(0.10-0.47)Rm. Since the high-middle part of the trailing edge change the distribution of pressure of the blades before the blade root part, the high pressure draught compartment of the blades flow direction low pressure surface advanced to make local pressure ascending, to reduce boundary layer separating, to make the boundary layer turn into turbulent flow before getting the front of the blade end, to reduce convolution noise and rotor wake, thereby having low noise and big air quantity.

Description

Axial-flow windwheel

Technical field

The present invention relates to a kind of axial-flow windwheel, particularly a kind of cloverleaf axial-flow windwheel that is applicable to the air conditioner outdoor machine group.

Background technique

In the outdoor unit of air conditioner, adopt axial flow fan mostly.Axial flow fan is in the past protruding or 2 to 4 blades of concordant formation to the flow outlet downstream direction with the contacted back of air-out airflow downstream side portion (following will be called " blade trailing edge " with the back portion of the contacted blade in downstream side of air-flow).

Individual blade load in the conventional axial-flow windwheel of 2 blades of employing is big, each blade is all worked under high load, and flow and static pressure are all lower, air-out noise height, and require motor to have higher rotating speed, the intensity and the motor load characteristic that 2 rachises are flowed wind wheel require all than higher.Because air quantity is with the load variations sensitivity, conventional on year-on-year basis 3 leaves of air quantity or 4 blade wind-wheels of conventional 2 rachises stream wind wheel descend about 30%, are unfavorable for taking away rapidly the heat of outdoor unit; If adopt the axial fan of common 3 blades or 4 blades, rise not enough problem though can solve the flow and the static pressure of 2 blade axial-flow wind wheels well, but himself weight increases with causing, motor load strengthens because lobe numbers increases, and the wind wheel cost also improves more than 30%～50% because of the increase of weight.

In addition, conventional axial-flow windwheel is forming around the wheel hub (hub) on 2 of one or a plurality of blade, the bight that blade back portion and blade outer rim end are constituted, this bight forms lug boss concordant towards the downstream direction of air-flow or that bloat, do not have all to consider that boundary layer separates and reduction rotor tail suppresses noise and improves flow by reducing, both do not considered low noiseization, and do not considered to alleviate wind wheel weight and motor load yet by blade trailing edge, blade middle part and top area are handled.

Summary of the invention

The object of the present invention is to provide a kind of by reducing the boundary layer separation and reducing the rotor tail and suppress noise and improve flow, and reduction wind wheel rotational speed and wind wheel weight, reduce the wind wheel cost, reduce the axial-flow windwheel of motor load simultaneously, to overcome deficiency of the prior art.

A kind of axial-flow windwheel by this purpose design, comprise three blades that are arranged on the wheel hub, its structure characteristic is that the trailing edge zone of blade caves in to the blade inlet edge airintake direction, three blades are the center with the rotating center axis of wind wheel mutually, are in 120 ° ± 15 ° scope equidistantly or the unequal-interval distribution.

So, blade trailing edge leaf height middle part and top area have shifted to an earlier date in the blade root area change pressure distribution state of blade, make blade high pressure draught part flow to the blade low pressure surface in advance, cause local compression to raise, reduced the boundary layer separation on the whole, and make the blade edge interlayer before arriving at blade trailing edge, become turbulent flow well, thus effectively reduce eddy current noise and rotor tail, so have than lower noise of conventional axial-flow windwheel and bigger air quantity.

The outer diameter of above-mentioned axial-flow windwheel is defined as D2, and hub diameter is defined as D1, and setting (D2-D1)/2 is blade height Rm, and A place, the position circle diameter of blade trailing edge depression beginning is defined as D3, and (D3-D1)/2=(0.10～0.47) Rm is arranged; B place, the position circle diameter that the blade trailing edge depression finishes is defined as D4, and (D4-D1)/2=(0.8～1.0) Rm is arranged.

In the above-mentioned axial-flow windwheel, will be defined as H2 from the wind wheel blade height that the blade trailing edge extreme lower position is counted, the maximum height of the sunk part of counting from the blade trailing edge extreme lower position is defined as H1, and the value of H1/H2 is in 0.05～0.29 scope.

In the above-mentioned axial-flow windwheel, the blade trailing edge chord of blade line length that deep-seated puts the place that caves in is defined as L, this position cup depth is δ along the degree of depth of chord length direction, and the ratio ε of cup depth δ and this zone chord of blade line length L (ε=5/L) in 0.05～0.25 scope.

The present invention can effectively realize weakening the tail intensity of vane rotor, reduces the rotor boundary layer and separates, thereby reduce the wind wheel noise effectively, and can alleviate wind wheel weight, reduces the wind wheel fabricating cost, and reduces motor load.

Cloverleaf axial-flow windwheel of the present invention not only can solve the problem that adopts conventional 3 leaves or 4 blade wind-wheel preponderances and cause motor load to increase well, and it is excessive and flow that cause reduces and static pressure rises the problem of deficiency to solve the load of conventional 2 rachises stream wind wheel blade, alleviated wind wheel weight, reduced motor load and reduced the wind wheel cost more than 25%; Also concentrate simultaneously to have all advantages of conventional 2 leaves, 3 leaves and 4 blade wind-wheels, and have lower noise and motor load, and lower wind wheel weight and wind wheel fabricating cost.

The present invention is particularly useful for the outdoor machine of air conditioner group.

Description of drawings

Fig. 1 is one embodiment of the invention master TV structure schematic representation.

Fig. 2 is one embodiment of the invention perspective view.

Fig. 3 is a diameter definition structure schematic representation of the present invention.

Fig. 4 is the present invention's height definition structure schematic representation.

Fig. 5 is chord of blade line length of the present invention and depression length definition structure schematic representation.

Fig. 6 is the graph of relation of depression initial position distribution with noise level.

Fig. 7 is the rotor tail scatter chart of conventional axial-flow windwheel.

Fig. 8 is a rotor tail scatter chart of the present invention.

Fig. 9 is the ratio of the blade chord length of trailing edge depression maximum depth value and depression maximum depth position and the graph of relation of wind wheel noise and motor load.

Figure 10-Figure 11 is two different specific embodiment master TV structure schematic representation of the present invention.

Figure 12 the present invention is applicable to an embodiment's of air conditioner outdoor machine group sectional structure schematic representation.

Embodiment

Below in conjunction with drawings and Examples the present invention is further described.

Among the figure, 1 is axial-flow windwheel, and 2 is wheel hub, and 3 is blade, 3a is the downstream side edge part of air-flow, 3b is a depressed part, and D1 is a hub diameter, and D2 is the outer diameter of axial-flow windwheel, D3 is a blade trailing edge depression initial position A place circle diameter, D4 is B place, the position circle diameter that blade trailing edge depression finishes, and Rm is a blade height, and H1 is the maximum height of the sunk part counted from blade 3 trailing edge extreme lower position C, the wind wheel blade height of H2 for counting from blade 3 trailing edge extreme lower position C, δ is a cup depth, and L is the chord of blade line length, and f is a leaf top trailing edge point, k is a line, 11 is the air conditioner outdoor machine group, and 12 is housing, and 13 is outdoor heat converter, 14 is compressor, 15 is four-way valve, and 16 is appliance circuit, and 17 is isolating plate.

Referring to Fig. 1-Fig. 2 and Figure 10-Figure 11, cloverleaf axial-flow windwheel 1 comprises the blade 3 that is arranged on the center hub 2, three blades 3 have same shape, cave in to blade 3 leading edge airintake directions in the trailing edge zone of blade 3, three blades 3 are the center with wind wheel rotating center axis G, in 120 ° ± 15 ° scope, form along the equidistant or unequal-interval of wheel hub 2 circumference and arrange, form and the reverse depression of air-flow on the downstream side edge part 3a of the air-flow of blade 3 in the wind wheel rotation, roughly be the back depressed part 3b of sickleshaped, crescent moon, circular arc, V font or broken line shape.

Referring to Fig. 3 and Fig. 6, the outer diameter of axial-flow windwheel is defined as D2, hub diameter is defined as D1, and setting (D2-D1)/2 be blade height Rm, and the blade trailing edge initial position A place circle diameter that caves in is defined as D3, and (D3-D1)/2=(0.10～0.47) Rm is arranged; B place, the position circle diameter that the blade trailing edge depression finishes is defined as D4, and (D4-D1)/2=(0.8～1.0) Rm is arranged.Depression initial position A begins to have lower level of noise from blade height (0.10～0.47) Rm, when caving in initial position A when (0.10～0.47) Rm is interval, level of noise all is lower than 50.5 decibels, if the depression initial position is less than 0.10Rm or greater than 0.47Rm, all more than 50.5 decibels, noise can not reduce level of noise fully.

Referring to Fig. 4, will be defined as H2 from the wind wheel blade height that blade 3 trailing edge extreme lower position C are counted, the maximum height of the sunk part of counting from blade 3 trailing edge extreme lower position C is defined as H1, and the value of H1/H2 is in 0.05～0.29 scope.The blade 3 trailing edges chord of blade line length that deep-seated puts the e place that caves in is defined as L, see Fig. 5, this position cup depth is δ along the degree of depth of chord length direction, and the ratio ε of cup depth δ and this zone chord of blade line length L (is ε=δ/L) in 0.05～0.25 scope.

The chord of blade line length L of this moment is that the scope of the predetermined radius R that begins of the rotating center from wind wheel is drawn bowlder, and the length of the circumferencial direction of the blade 3 that intersects with this circle is because blade is generally curve form, so this chord of blade line length L is the length of curve along curved surface.If definition depression initial position A is k with line between the trailing edge point f of leaf top, the cup depth δ of this moment is that the scope of the predetermined radius R that begins of the rotating center from wind wheel is drawn bowlder, the length that this circle and the deep-seated that caves in are put the circumferencial direction of e and line k formation.

Referring to Fig. 7-Fig. 8, Fig. 7 is the distribution curve of the rotor tail of conventional three rachises stream wind wheel along leaf tip circle week, Fig. 8 is the distribution curve of rotor tail of the present invention along leaf tip circle week, Cz represents the axial velocity of wind wheeling rotor among the figure, Ut represents the peripheral velocity (Ut=π D2n/60) of leaf top excircle, axial velocity Cz/Ut represents zero dimension axial velocity coefficient, the intensity of variation of axial velocity is represented the power of rotor tail, little (the 0.425-0.35)/0.425*100%=17% of rotor axial velocity variations of the present invention, and the axial velocity variation rate of conventional axial-flow windwheel is (0.45-0.05)/0.45*100%=89%; So, adopt axial-flow windwheel of the present invention can significantly weaken the rotor tail, thereby reduce noise and reduce motor load.

Referring to Fig. 9, as the ratio ε of the chord of blade line length L of blade trailing edge depression maximum depth δ and depression leaf high position, maximum depth place (in the scope of ε=δ/L) time 0.05～0.25, wind wheel has lower noise and less motor load simultaneously, the level of noise of this moment is lower than 50.5 decibels, motor load is less than 52 watts, (ε=δ/L) is less than 0.05 or greater than 0.25 the time and as this ratio ε, all can not possess simultaneously lower noise and less motor load are arranged, noise and motor load all can not reduced effectively.

Referring to Figure 12, air conditioner outdoor machine group 11 accommodates the outdoor heat converter 13 that is the L font in housing 12, have three rachis streaming wind wheels 1, compressor 14, the four-way valve 15 of said structure feature and comprise appliance circuit 16, the three rachis streaming wind wheels 1 of transducer etc. and compressor 14 between isolate with isolating plate 17.This three rachises streaming wind wheel 1 can effectively reduce rotor tail and noise, and also reduce motor load and wind wheel weight when real-world operation, adopts air conditioner outdoor machine group of the present invention also can have the characteristic of low motor load and higher electric efficiency.

Claims

1. axial-flow windwheel, comprise three blades that are arranged on the wheel hub, the trailing edge zone that it is characterized in that blade is to blade inlet edge airintake direction depression, and three blades are the center with the rotating center axis of wind wheel mutually, is in 120 ° ± 15 ° scope equidistantly or the unequal-interval distribution.

2. axial-flow windwheel according to claim 1, the outer diameter that it is characterized in that axial-flow windwheel is defined as D2, hub diameter is defined as D1, setting (D2-D1)/2 is blade height Rm, A place, the position circle diameter of blade trailing edge depression beginning is defined as D3, and (D3-D1)/2=(0.10～0.47) Rm is arranged; B place, the position circle diameter that the blade trailing edge depression finishes is defined as D4, and (D4-D1)/2=(0.8～1.0) Rm is arranged.

3. axial-flow windwheel according to claim 1 and 2, it is characterized in that in the axial-flow windwheel, to be defined as H2 from the wind wheel blade height that the blade trailing edge extreme lower position is counted, the maximum height of the sunk part of counting from the blade trailing edge extreme lower position is defined as H1, and the value of H1/H2 is in 0.05～0.29 scope.

4. axial-flow windwheel according to claim 3, it is characterized in that in the axial-flow windwheel, the blade trailing edge chord of blade line length that deep-seated puts the place that caves in is defined as L, this position cup depth is δ along the degree of depth of chord length direction, and ratio ε=δ/L of cup depth δ and this zone chord of blade line length L is in 0.05～0.25 scope.

5. axial-flow windwheel according to claim 4 is characterized in that axial-flow windwheel is applicable to the outdoor machine of air conditioner group.

6. axial-flow windwheel according to claim 1 is characterized in that the blade recess is sickleshaped, crescent moon, circular arc, V font or polyline shaped.