CN201401348Y - Crossflow fan - Google Patents
Crossflow fan Download PDFInfo
- Publication number
- CN201401348Y CN201401348Y CN2009200554793U CN200920055479U CN201401348Y CN 201401348 Y CN201401348 Y CN 201401348Y CN 2009200554793 U CN2009200554793 U CN 2009200554793U CN 200920055479 U CN200920055479 U CN 200920055479U CN 201401348 Y CN201401348 Y CN 201401348Y
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- China
- Prior art keywords
- blade
- axial
- flow fan
- impeller
- blade profile
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- Expired - Lifetime
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Abstract
The utility model discloses a crossflow fan which is suitable for ventilation of air conditioners and other domestic appliances. The crossflow fan comprises impellers connected together axially by a plurality of middle segments; a rotating shaft is arranged in the axial centre of the impeller; and a plurality of blades are peripherally distributed in the middle segment. The crossflow fan is characterized in that the blade profile centre lines are different from each other on any cross section in the length direction of the impeller; as the blade is in the length direction of the impeller, theblade profile of the middle segment configured in a direction parallel to the rotating shaft of the impeller is in gradual transition, i.e., the blade profile centre lines are different from a big head direction to a small head direction. The utility model is advantaged in reducing the rotation noise peak and lowering or even completely eliminating howling affecting the comfort for users to the utmost, ensuring the air flow, and the like.
Description
Technical field
The utility model relates to a kind of axial-flow fan, is applicable to ventilations such as air conditioner and other household electric appliance.
Background technique
Present split-type air conditioner is owing to generally use new technology such as axial-flow fan, and the noise index was greatly improved than former product.Conventional axial-flow fan (Fig. 1) by middle joint, end cap, bearing housing assembly etc. by injection moulding, chimeric, welding is fixing etc., and mode combines.The blade of axial-flow fan is arranged on each joint (Fig. 2).In the longitudinal direction, joint generally has prismatic blade by the blade of the direction configuration parallel with turning axle in the impeller in each, oblique blade, and twisted blade tiltedly turn round types such as combined blade, but the blade profile of blade all belongs to single blade profile, is the blade profile center line of shape of the same race.This axial-flow fan has that the rotational noise peak value is higher, and howling is more obvious, shortcomings such as cacophonize.
The model utility content
The technical problems to be solved in the utility model is to overcome the shortcoming of prior art, and a kind of reduction rotational noise peak value is provided, and reduces the axial-flow fan of the gradual transition blade profile of howling to greatest extent.
The realization the technical solution of the utility model is: a kind of axial-flow fan, comprise the impeller that links together vertically by joint in a plurality of, the axial centre of impeller is provided with turning axle, that saves in each circumferentially is distributed with a plurality of blades, it is characterized in that: on the arbitrary section of impeller length direction, the blade profile center line of blade is different.
The blade profile center line of described blade is gradual change along the length direction of blade.
Described same in blade on the joint upwards be in week and be not equally spaced.
Described blade is formed by two or more different blade profile gradual transition.
The blade of axial-flow fan can be prismatic blade or oblique blade or twisted blade or tiltedly turn round combined blade on middle joint.
Gradual change blade profile axial-flow fan provided by the utility model, it is applicable to ventilation ventilations such as air conditioner and other household electric appliance.Its two kinds of blade selection or two or more blade profile gradual transition form.Because blade is on the impeller length direction, the vane foil that joint disposes by the direction parallel with turning axle in the impeller in each is a gradual transition, be that major part is not a blade profile center line of the same race toward microcephaly's direction, it has can lower the rotational noise peak value to greatest extent, the howling of the reduction even the users'comfort of eliminating the effects of the act fully can guarantee advantages such as air quantity again to greatest extent.
Description of drawings
Fig. 1 is the structure diagram of axial-flow fan;
Fig. 2 is the sectional view of the middle joint of axial-flow fan;
Fig. 3 is the sectional view of existing blade profile axial-flow fan blade;
Fig. 4 is the sectional view of the gradual change blade profile axial-flow fan blade that provides of the utility model;
Fig. 5 is the stereogram of the blade of the utility model axial-flow fan;
Fig. 6 is the interior flow field figure of axial-flow fan cross section in the air conditioner.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model axial-flow fan is described further.
Shown in accompanying drawing 1,2, the preferred embodiment of the axial-flow fan that the utility model provides comprises the impeller that is formed by ultrasonic welding by the same middle joint of number joint, specifically comprise axle cap 1, turning axle 2, shaft-cup 3, middle joint 5, end cap 7, axle sleeve 8, Cock screw 6, middle joint 5 hoop distribution blades 4.The work done mechanism of axial-flow fan is to allow wind penetrating blade 4 by the inner principles that form eccentric vortexs of blade 4, thus work done (as accompanying drawing 6).Axial-flow fan is different from the centrifugal turbine fan, the wind direction in centrifugal turbine fan when operation for from upper shaft to entering, radially centrifugal discharge.Therefore the blade of centrifugal turbine fan also can be in the intake grill partial cut, and promptly the direction of intake grill edge hub reduces (gradual change) gradually to axial region, to meet the afflux work done principle of centrifugal blade.But the center line of this centrifugal blade blade profile and existing axial-flow fan vane foil is linear all to be consistent from the vane tip to the bottom.Wherein the center line of blade profile is meant the pressure side of cross section blade of the blade that fluid is flowed through and the medium line of suction surface, is generally single circular arc or many circular arcs and constitutes.
Shown in accompanying drawing 3,4, the contrast of the gradual change blade profile axial-flow fan blade that provides for common blade profile axial-flow fan blade and the utility model.Solid line partly is the blade major part among Fig. 3, and dotted portion is the blade microcephaly, and the dot and dash line of intermediate portion is the blade profile center line, though wherein blade major part and microcephaly's blade profile center line does not overlap, their shape is consistent.If the blade profile center line overlaps, this blade is prismatic blade.Solid line partly is a blade major part 41 among Fig. 4, dotted portion is blade microcephaly 42, the dot and dash line of intermediate portion is respectively major part blade profile center line 411 and microcephaly's blade profile center line 421, wherein the shape of major part blade profile center line 411 and microcephaly's blade profile center line 421 is inconsistent, and blade is from major part 41 to the microcephaly 42, its blade profile center line is gradual change (as an accompanying drawing 5), wherein wire shaped is different, because the blade profile center line is the pressure side of blade and the medium line of suction surface, therefore, the vane foil of axial-flow fan also is a gradual transition in the utility model.
And, in this preferred embodiment in axial-flow fan same blade 4 on the joint 5 save upwards being in week not to be equally spaced or to be equally spaced to be arranged in.Promptly as shown in Figure 2, A wherein
I (i=1,2,3Be minute of angle) unequal then for not being equally spaced, equal then for being equally spaced.In addition, can also be under the situation that does not influence Mould Machining production etc. according to different design needs, on same blade, can select two kinds or two or more blade profile gradual transition to form.Because the aerodynamic noise of cross flow blower generally includes rotational noise and turbulence noise.Rotational noise is meant the noise that the rotary pressure field that forms owing to the gas of blade around periodically pushing and these pressure pulsation and solid wall surface interaction cause, it often occurs with the fundamental frequency of certain frequency and the form of harmonic wave, the utility model is because pressure pulsation vertically has the effect of cancelling out each other, the energy of fundamental frequency (carrier wave) is distributed in the side frequency goes, thereby reduce the peak energy at fundamental frequency place.Reduce of the influence of sharp-pointed single-frequency noise from comfortable angle, reach noise reduction the people.Turbulence noise mainly is owing to during the airflow passes blade, produce turbulent attached aspect and vortex and vortex and come off, cause the blade upward pressure pulsation caused.The utility model uses good blade streamline pattern and inclination angle will help controlling the formation of air-flow vortex and coming off, rearranged the type of flow of heat exchange air-flow from aerodynamic angle, under the constant prerequisite of air circulation and heat exchange efficiency, improve flowing state, can reduce significantly by phenomenons such as separated flows, eliminated the noise that the air-flow resonance phenomenon is caused, the turbulence noise of generation is brought out in reduction by eddy current, improved the continuity of moment air-supply, reduced the impact of air-flow to spiral case, improved the stability of rotating, wind-force is more even soft.
Claims (5)
1, a kind of axial-flow fan, comprise the impeller that is linked together vertically by joints in a plurality of, the axial centre of impeller is provided with turning axle, and that saves in each circumferentially is distributed with a plurality of blades, it is characterized in that: on the arbitrary section of impeller length direction, the blade profile center line of blade is different.
2, axial-flow fan according to claim 1 is characterized in that: the blade profile center line of described blade is gradual change along the length direction of blade.
3, axial-flow fan according to claim 1 and 2 is characterized in that: described same in blade on the joint upwards be in week and be not equally spaced.
4, axial-flow fan according to claim 1 and 2 is characterized in that: described blade is formed by two or more different blade profile gradual transition.
5, axial-flow fan according to claim 1 is characterized in that: the blade of axial-flow fan can be prismatic blade or oblique blade or twisted blade or tiltedly turn round combined blade on middle joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200554793U CN201401348Y (en) | 2009-04-21 | 2009-04-21 | Crossflow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200554793U CN201401348Y (en) | 2009-04-21 | 2009-04-21 | Crossflow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201401348Y true CN201401348Y (en) | 2010-02-10 |
Family
ID=41661148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200554793U Expired - Lifetime CN201401348Y (en) | 2009-04-21 | 2009-04-21 | Crossflow fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201401348Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108223430A (en) * | 2017-08-23 | 2018-06-29 | 广东顺威精密塑料股份有限公司 | A kind of through-flow fan blade |
-
2009
- 2009-04-21 CN CN2009200554793U patent/CN201401348Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108223430A (en) * | 2017-08-23 | 2018-06-29 | 广东顺威精密塑料股份有限公司 | A kind of through-flow fan blade |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100210 |
|
| CX01 | Expiry of patent term |