CN1289825C - Cross flow fan - Google Patents
Cross flow fan Download PDFInfo
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- CN1289825C CN1289825C CN 02116627 CN02116627A CN1289825C CN 1289825 C CN1289825 C CN 1289825C CN 02116627 CN02116627 CN 02116627 CN 02116627 A CN02116627 A CN 02116627A CN 1289825 C CN1289825 C CN 1289825C
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- impeller
- blade
- air
- cross flow
- plane
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Abstract
The present invention discloses a cross flow fan which can prevent the stall phenomenon generated by the exhaust of air flowing on the surface of blades in the rotating process of the blades. The cross flow fan has the following structures that a single fan is composed of a plurality of blades which bend along a rotary direction and are arrayed at intervals on the circumference; a plurality of single fans are connected in series into an impeller along a direction of a shaft; a back guide rail bending with certain curvature is arranged behind an outer case of the impeller, so that an exhaust flow passage is formed; a stabilizer is arranged along a direction of a shaft and keeps certain space with the impeller; the stabilizer and a gap part of the back guide rail form a boundary for dividing a high voltage part and a low voltage part; an eddy current generator is arranged close to the front edges of the blades of the impeller and converts the flow of ingress air to the flow of eddy currents with larger kinetic energy.
Description
Technical field
The invention relates to the blower fan of use in refrigeration system, particularly a kind of cross flow fan
Background technique
General gas fan is arranged on air conditioner or the refrigerating plant etc., forces to suck or discharge the device of outside air or cold air.This gas fan is divided into fan with low voltage and high pressure blower according to head pressure; Be divided into centrifugal blower, axial blower, cross-flow type blower etc. according to blade.A kind of as the cross-flow type blower of cross flow fan wherein, axle direction does not have suction stream, but the suction and the discharge that produce air in low voltage section L and the high-voltage section H at the impeller shaft place.Cross flow fan generally helps producing the big air quantity of high malleation, flows owing to produce uniformly on axle direction, is widely used in air conditioner, particularly wall-through type air conditioner and ceiling air conditioner.
With reference to the accompanying drawings the structure of cross flow fan is carried out simple explanation.
Fig. 1 a is the sectional view of general cross flow fan structure.Fig. 1 b is the expanded view of air flows on the blade of cross flow fan of Fig. 1 a.As shown in the figure, general cross flow fan has following structure: the impeller 100 that produces air flows and motor carry out spool combining; Be arranged on the rear of impeller according to the conducting element 20 of specific curvature bending, form the discharge stream that sucks air; Stabilizer 30 is arranged on a side of impeller outside along axle direction, is stabilized in the eddy current that produces in the inner field of impeller, forms the boundary of division high-voltage section H and low voltage section L with the clearance portion of conducting element.
Impeller 100 is made of a plurality of single blower fan of the demarcation strip polyphone of annular, and each single blower fan is made up of a plurality of blades 110 to the sense of rotation bending, and blade 110 keeps suitable spacing to arrange on circumference.
Form clearance portion 21 on one side of conducting element 20, clearance portion 21 and impeller 100 keep the shortest distance along axial formation.At this moment the clearance portion 21 of conducting element forms the boundary that sucks gas and discharge gas with stabilizer 30.
Working procedure to cross flow fan is elaborated below.Impeller 100 rotations then form eddy current in the inside of impeller, are forced to flow by the eddy current air.Be described in more detail, then as shown in Figure 1a, impeller 100 is along rotation counterclockwise, and then the auxiliary line that links to each other with the clearance portion 21 of stabilizer 30 and conducting element is a benchmark, the place ahead (be the left side in the drawings) formation low voltage section L, and air is forced to suction; The rear of auxiliary line (being the right side in the drawings) forms high-voltage section H, and air is along with the guiding of conducting element 20 is discharged from.In sum, cross flow fan does not have axial suction stream, and forms the suction and the discharge of air in perpendicular to the plane of 100 in impeller.
Provide air-supply power but various blowers such as cross flow fan are the rotations by blade 110, exceeding under the operating condition of certain action range, the stall phenomenon can appear in blade.
Shown in Fig. 1 b, flow to the trailing edge process because the influence of resistance from the leading edge of blade through blade 110 surperficial leaked-in airs, kinetic energy reduces, and is subjected to the pressure stronger than leading edge at the vane trailing edge air in addition and is discharged from.The inflow air is discharged from, and produces wake flow later at discharge point, and the field that produces wake flow is big more, and then drag increases, and produces stall.
The working state of this stall phenomenon beyond design point, that is, the flowing velocity of air is slow, when the rotational speed of opposite blade is fast, the stall phenomenon often occurs, has finally reduced efficient, and blade can destroy in the time of more very.
Summary of the invention
In order to solve the problem of above existence, the purpose of this invention is to provide a kind of cross flow fan, increase the kinetic energy that is flowing in air on the blade, prevention or postponement are discharged, and prevent to produce the stall phenomenon.
To achieve these goals, the technical solution used in the present invention is: single blower fan is made up of a plurality of blades, and blade is along the sense of rotation bending, and blade is arranged according to certain intervals on circumference, and a plurality of single blower fans are connected into impeller along axle direction; Be arranged on the rear of impeller according to the conducting element of specific curvature bending, form and discharge stream; Stabilizer keeps a determining deviation along the axle direction setting with impeller, forms the boundary of dividing high-voltage section and low voltage section with the clearance portion of conducting element; Vortex generator is arranged on the blade of impeller near the leading edge position, will flow into the mobile bigger turbulent flow of kinetic energy that converts to of air.
According to above-mentioned cross flow fan, its vortex generator protrudes and is arranged on the blade near the leading edge position, vortex generator is made up of the acclivitous plane of inclination and the inclined-plane that dips down, be inclined upwardly face to be inclined upwardly angle bigger than the entering angle that flows into air, the inclined-plane that dips down is downward-sloping at the rear of the face of being inclined upwardly.
Cross flow fan of the present invention can bring following effect: near the leading edge position vortex generator is set on blade, will flows into the mobile big turbulent flow of kinetic energy that becomes of air, can prevent to discharge or postpone at least and discharge.So prevented the stall of the blade that causes by discharge, improved the efficient of blower fan, the ruined problem of blade when also having solved stall in addition.
Description of drawings
Fig. 1 a is the sectional view of general cross flow fan structure.
Fig. 1 b is the expanded view of air flows on the blade of cross flow fan of Fig. 1 a.
Fig. 2 a is the sectional view of cross flow fan structure of the present invention.
Fig. 2 b is the expanded view of air flows on the blade of cross flow fan of Fig. 2 a.
Among the figure:
1: auxiliary line
20: conducting element 21: the conducting element clearance portion
30: stabilizer 100: impeller
110: blade 111: the leading edge of blade
200: vortex generator 210 top incline
220: bottom incline
H: high-voltage section L: low voltage section
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Fig. 2 a is the sectional view of cross flow fan structure of the present invention.Fig. 2 b is the expanded view of air flows on the blade of cross flow fan of Fig. 2 a.
Shown in Fig. 2 a, the structure of cross flow fan is as follows: the impeller 100 that produces air flows combines with the axle of motor; Be arranged on the rear of impeller according to the conducting element 20 of specific curvature bending, form the discharge stream that sucks air; Stabilizer 30 is arranged on a side of impeller outside along axle direction, is stabilized in the eddy current that produces in the inner field of impeller, forms the boundary of division high-voltage section H and low voltage section L with the clearance portion of conducting element.
Impeller 100 is made of a plurality of single blower fan of the demarcation strip polyphone of annular, and single blower fan is made up of a plurality of blades 110 along the sense of rotation bending, and blade 110 keeps suitable spacing to arrange on circumference.At this moment, for blade 110 can be combined on the demarcation strip, the end of blade 110 is formed with the insertion projection, is formed with a plurality of insertion grooves on the circumferential surface of demarcation strip.
Form clearance portion 21 on one side of conducting element 20, clearance portion 21 and impeller 100 keep the shortest distance along axial formation.At this moment the clearance portion of conducting element and stabilizer 30 form the boundary that sucks gas and discharge gas.Go up near the leading edge position
Shown in Fig. 2 b, on blade, be provided with vortex generator 200 near leading edge 111 positions, vortex generator 200 can make the mobile turbulent flow that becomes that flows into air.Flowing of fluids such as air can be divided into the turbulent flow and the swash of wave substantially.Turbulent flow belongs to the type of sports of irrgular movement in time with on the space, and to compare kinetic energy bigger with the swash of wave.Become turbulent flow so flow into air by vortex generator 200, because kinetic energy is increased, the resistance on inertia ratio blade 110 surfaces is big, phenomenon can not occur discharging, also can rearward not postpone even phenomenon occurs discharging.
Vortex generator 200 is made up of the acclivitous plane of inclination 210 and the inclined-plane 220 that dips down.Plane of inclination 210 to be inclined upwardly angle bigger than the entering angle that flows into air, plane of inclination 220 in the plane of inclination 210 rear downward-sloping.Vortex generator 200 protrudes and is arranged on the blade 110 near the leading edge position.When leaked-in air is flowed through vortex generator 200, on the separating surface on the face of being inclined upwardly 210 and the inclined-plane 220 that dips down, form eddy current, on the surface of blade 110, form the bigger turbulent flow boundary layer of kinetic energy by eddy current.
On the one hand, vortex generator 200 can form one with blade 110, perhaps with other parts vortex generator 200 is combined on the blade 110.
Working procedure to cross flow fan is elaborated below.Impeller 100 according to clockwise or be rotated counterclockwise, then forms eddy current in the inside of impeller 100 according to the bending direction of blade 110, and by eddy current, air is forced to flow.Be described in more detail, impeller 100 rotation is a benchmark with the auxiliary line 1 that the clearance portion 21 of stabilizer 30 and conducting element links to each other then, the place ahead (being the left side on the figure) formation low voltage section L, rear (being the right side on the figure) formation high-voltage section H.Air is inhaled into by low voltage section after the inside of impeller 100, and the guiding along the eddy current of impeller sense of rotation rotation along conducting element 20 is discharged from through high-voltage section.
On above-mentioned, each blade 110 leaked-in airs from impeller though owing to reasons such as kinetic energy deficiencies, be discharged from certain place of blade, by being arranged on the vortex generator 200 on the blade, can prevent the generation of this phenomenon in advance.That is to say, when each blade 110 leaked-in airs of impeller are flowed through vortex generator 200, on the separating surface on the face of being inclined upwardly 210 and the inclined-plane 220 that dips down, form eddy current, on the surface of blade 110, form the bigger turbulent flow boundary layer of kinetic energy by eddy current.Owing to be flowing in air inertia on the turbulent flow boundary layer greater than resistance, do not continue to flow so be not discharged from up to the trailing edge of blade 110, perhaps discharge and be delayed.
Fig. 2 b is the expanded view of air flows on the blade of cross flow fan of Fig. 2 a.As shown in the figure, compared with the prior art, from the leading edge 111 of blade 110 to discharge point apart from the distance of w2 than prior art, the w1 shown in Fig. 1 b has grown a lot.Even on blade 110, discharge in this case,, the influence of wake flow can be minimized because discharge point has retreated a lot.
Cross flow fan of the present invention can prevent to be discharged from or delay discharge at least from the blade leaked-in air, has prevented the stall phenomenon of blade.
Up to the present, be illustrated, in the technical field of the invention, have the personnel of general knowledge, in basic fundamental scope of the present invention, can propose the embodiment of a lot of distortion though the present invention is the center with embodiment.Basic fundamental scope of the present invention has embodiment in the request scope, in equal scope, the form of distortion is also included within the present invention.
Claims (2)
1. cross flow fan is characterized in that single blower fan is made up of a plurality of blades (110), and blade (110) is along the sense of rotation bending, and blade (110) is arranged according to certain intervals on circumference, and a plurality of single blower fans are connected into impeller (100) along axle direction; Be arranged on the rear of impeller (100) according to the conducting element (20) of specific curvature bending, form and discharge stream; Stabilizer (30) keeps a determining deviation along the axle direction setting with impeller (110), with clearance portion (21) the formation division high-voltage section (H) of conducting element and the boundary of low voltage section (L); Vortex generator (200) is arranged near leading edge (111) position on the blade of impeller (100), will flow into the mobile bigger turbulent flow of kinetic energy that converts to of air.
2. according to the described cross flow fan of claim 1, it is characterized in that vortex generator (200) protrusion is arranged on blade (110) and goes up near leading edge (111) position, vortex generator (200) is made up of acclivitous plane of inclination (210) and the inclined-plane that dips down (220), plane of inclination (210) to be inclined upwardly angle bigger than the entering angle that flows into air, plane of inclination (220) in the plane of inclination rear of (210) downward-sloping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02116627 CN1289825C (en) | 2002-04-15 | 2002-04-15 | Cross flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02116627 CN1289825C (en) | 2002-04-15 | 2002-04-15 | Cross flow fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1451881A CN1451881A (en) | 2003-10-29 |
| CN1289825C true CN1289825C (en) | 2006-12-13 |
Family
ID=29221007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02116627 Expired - Fee Related CN1289825C (en) | 2002-04-15 | 2002-04-15 | Cross flow fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1289825C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230479A (en) * | 2011-08-04 | 2011-11-02 | 福建鑫麟机械有限公司 | Tubular fan impeller used for leaf cutter |
| CN107606698B (en) * | 2017-08-30 | 2019-12-06 | 青岛海尔空调器有限总公司 | Indoor unit of air conditioner |
-
2002
- 2002-04-15 CN CN 02116627 patent/CN1289825C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1451881A (en) | 2003-10-29 |
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