CN210889456U - Axial fan and air condensing units - Google Patents
Axial fan and air condensing units Download PDFInfo
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- CN210889456U CN210889456U CN201922075474.3U CN201922075474U CN210889456U CN 210889456 U CN210889456 U CN 210889456U CN 201922075474 U CN201922075474 U CN 201922075474U CN 210889456 U CN210889456 U CN 210889456U
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Abstract
The utility model provides an axial fan and an air conditioner outdoor unit, wherein the axial fan comprises a hub and blades arranged on the side wall of the hub, the blades comprise wing shapes, and the wing shapes are the cross sections of the concentric cylindrical surfaces of the hub and the blades; the blade comprises a blade root area and a blade top area, and the blade comprises an airfoil profile center line which is a central connecting line of all inscribed circles arranged along an airfoil profile line; the blade comprises a front edge and a rear edge, the front edge and the rear edge are arranged oppositely and respectively face the air inlet end of the hub and the air outlet end of the hub; the intersection point of the airfoil profile midline and the leading edge is a leading edge point, the intersection point of the airfoil profile midline and the trailing edge is a trailing edge point, and the connecting line of the leading edge point and the trailing edge point is a chord; the included angle formed by the chord and the vertical plane of the axis of the hub is an airfoil mounting angle, and the airfoil mounting angle of the blade root area is smaller than that of the top area. The condition that the efficiency of the axial flow fan is reduced due to the fact that the inner circulation of airflow in the blade root area cannot act on the blades and the loss of useful work caused by the design of the installation angle of the axial flow fan is improved.
Description
Technical Field
The utility model relates to an air condensing units fan field, concretely relates to axial fan and air condensing units.
Background
The axial flow fan system of the outdoor unit of the air conditioner mainly comprises air duct structures such as an air guide ring, an air outlet grid and an axial flow fan, and the air duct structures are mainly used for providing circulating air volume for heat exchange of a condenser. With the increasing of national energy efficiency standards and the pursuit of people for quality of life, how to design an axial flow fan system with larger air volume, lower power consumption and lower noise becomes an important development trend in the air conditioning industry.
When the axial flow fan is designed, an installation angle is formed between the fan blades and the hub, and the blade profile of the blades is combined, so that the most reasonable airflow deflection angle can be obtained when the fan rotates, the axial flow fan system has higher full pressure, and the air power capability is enhanced accordingly. The selection of the mounting angle has great influence on the airflow direction in the blade root area of the axial flow fan, and the mounting angle is gradually reduced from the blade root to the blade top in the prior art, so that the airflow is blown to the suction surface of the next blade from the pressure surface of one blade after entering the axial flow fan, and therefore part of the airflow is always circulated in the blade root area, the useful work of the axial flow fan doing work is greatly lost, and the efficiency of the axial flow fan is reduced.
SUMMERY OF THE UTILITY MODEL
To the not enough that exists among the prior art, the utility model provides an axial fan and air condensing units has solved the design of axial fan installation angle and has caused the air current to carry out the internal circulation in the blade root region and can not act on the blade and cause the problem that useful work loss leads to axial fan efficiency to reduce.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an axial fan comprises a hub and blades arranged on the side wall of the hub, wherein each blade comprises an airfoil shape, and the airfoil shape is a cross section formed by intersecting a concentric cylindrical surface of the hub and the blade; the blade comprises a blade root area and a top area, and an interface (28) between the blade root area and the top area is a cross section which is intersected with the blade when the diameter of the concentric cylindrical surface of the hub is d; the outer diameter of the fan is D, and D/D is a constant k; the blade comprises an airfoil center line which is a central connecting line of all inscribed circles arranged along an airfoil contour line; the blade comprises a front edge and a rear edge, the front edge and the rear edge are arranged oppositely and respectively face the air inlet end of the hub and the air outlet end of the hub; the intersection point of the airfoil profile midline and the leading edge is a leading edge point, the intersection point of the airfoil profile midline and the trailing edge is a trailing edge point, and the connecting line of the leading edge point and the trailing edge point is a chord; the included angle formed by the chord and the vertical plane of the axis of the hub is an airfoil mounting angle, and the airfoil mounting angle of the blade root area is smaller than that of the top area.
Preferably, the airfoil setting angle of the blade root area is thetaRoot of herbaceous plant，θRoot of herbaceous plantThe diameter of the concentric cylindrical surface of the hub gradually increases along the radial direction of the blade. Let thetaRoot of herbaceous plantThe angle value of the blade is gradually increased from the contact position of the blade and the hub, and the airfoil mounting angle of the blade root area is kept smaller than that of the blade tip area.
Preferably, θ of the contact position of the blade and the hubRoot of herbaceous plantIs marked as thetaRoot of Teng (root of Teng)Theta of the position of said interfaceRoot of herbaceous plantIs marked as thetaRoot max，15°≤θRoot of Teng (root of Teng)≤θRoot maxIs less than or equal to 45 degrees. The selection range of the airfoil installation angle of the blade root region is limited between 15 degrees and 45 degrees, and the airfoil installation angle of the blade root region is kept smaller than that of the blade top region.
Preferably, the airfoil setting angle of the top area is thetaTop roof，θTop roof＝Root max. And under the condition of limiting the selection range of the airfoil setting angle of the blade root region, further limiting a constant value of the airfoil setting angle of the top region, and selecting the maximum value of the airfoil setting angle of the blade root region.
Preferably, theta isRoot of herbaceous plantConstant value, then thetaRoot of herbaceous plant＝θRoot of Teng (root of Teng)＝θRoot max，20°≤θRoot of herbaceous plant<θTop roofIs less than or equal to 45 degrees. And under the condition that the airfoil installation angle of the blade root region is taken as a constant value, keeping the airfoil installation angle of the blade top region larger than that of the blade root region, and limiting the airfoil installation angle to be selected within the range of 20-45 degrees.
Preferably, theta isTop roofThe diameter of the concentric cylindrical surface of the hub is gradually increased along the radial direction of the blade, and theta is more than or equal to 15 degreesRoot of herbaceous plant<θTop roofIs less than or equal to 45 degrees. Under the condition that the airfoil installation angle of the blade root region is a constant value, the certain installation angle of the blade top region is gradually increased from the boundary surface to the edge of the blade, meanwhile, the airfoil installation angle of the blade root region is kept smaller than that of the blade top region, and the value is selected within the range of 15-45 degrees.
Theta is describedTop roofThe diameter of the concentric cylindrical surface of the hub is gradually increased along the radial direction of the blade, and theta is more than or equal to 15 degreesRoot of herbaceous plant<θTop roofIs less than or equal to 45 degrees. And the airfoil mounting angle of the blade root region is gradually increased from the contact position of the hub to the interface, the airfoil mounting angle of the blade top region is gradually increased from the interface to the blade, and the value is selected within the range of 15-45 degrees on the premise that the airfoil mounting angle of the blade root region is smaller than that of the blade top region.
Preferably, the constant k is more than or equal to 0.4 and less than or equal to 0.6.
Preferably, the number of the blades is at least two, and the blades are uniformly distributed along the circumference of the hub.
The utility model also provides an air condensing units, including the off-premises station casing, install as above arbitrary one in the off-premises station casing an axial fan.
Compared with the prior art, the utility model discloses following beneficial effect has:
the blades are divided into a blade root area and a top area through a hub concentric cylindrical surface with the diameter d, the mounting angle of the blade root area is smaller than that of the top area, the mounting angle of the blade root area is reduced, air in the area can be effectively prevented from blowing to the suction surface of the next blade from the pressure surface of one blade, and therefore the working power of the whole fan is effectively improved;
meanwhile, the larger installation included angle is kept in the top area, so that the air quantity and the air speed can be increased, the heat exchange performance of the outdoor unit and the air outlet capacity in the shutter are improved, the cooling efficiency of the axial flow fan is improved, and the fan efficiency is kept at a higher level.
Drawings
FIG. 1 is a schematic view of a forward configuration with blades mounted on a hub;
FIG. 2 is a schematic view of an airfoil section obtained by intersecting a concentric cylindrical surface of a hub with a blade;
FIG. 3 is a sectional view of the blade;
FIG. 4 is a schematic view of airfoil stagger angles for a root region A-A section and a tip region B-B section of FIG. 3;
in the figure, hub 1, blade 2, airfoil 21, root region 22, tip region 23, airfoil mean line 24, leading edge 25, trailing edge 26, chord 27, interface 28.
Detailed Description
The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
As shown in fig. 1-2, the present invention provides an axial fan, which includes a hub 1 and a blade 2 disposed on a sidewall of the hub 1, wherein the blade 2 includes an airfoil 21, and the airfoil 21 is a cross section of a concentric cylindrical surface of the hub 1 intersecting the blade 2; meanwhile, the blade 2 comprises a blade root area 22 and a top area 23, and an interface 28 between the blade root area 22 and the top area 23 is a cross section which is intersected with the blade 2 when the diameter of a concentric cylindrical surface of the hub 1 is d; when the outer diameter of the fan is D, D/D is a constant k; the boundary surface 28 separating the root region 22 and the tip region 23 on the blade 2 of the fan of different sizes is determined by the outer diameter of the fan and the selected constant k, and the boundary surface 28 mentioned here is generated by the tangent of the imaginary concentric circle of the hub 1 and the blade 2, while in practice, the root region 22 and the tip region 23 are seamlessly connected at the boundary surface 28 and are not actually separated.
Meanwhile, as shown in fig. 3, the blade 2 includes an airfoil centerline 24, which is a central line of each inscribed circle arranged along the contour line of the airfoil 21; the blade 2 comprises a front edge 25 and a rear edge 26, wherein the front edge 25 and the rear edge 26 are arranged oppositely and respectively face to the air inlet end of the hub 1 and the air outlet end of the hub 1; the intersection point of the airfoil profile midline 24 and the leading edge is a leading edge point, the intersection point of the airfoil profile midline 24 and the trailing edge 26 is a trailing edge point, and the connecting line of the leading edge point and the trailing edge point is a chord 27; the included angle formed by the chord 27 and the vertical plane of the axis of the hub 1 is an airfoil mounting angle, the airfoil mounting angle of the blade root area 22 is smaller than that of the top area 23, the blade 2 is divided into the blade root area 22 and the top area 23 through the interface 28, and then the airfoil mounting angle of the blade root area 22 is smaller than that of the top area 23; the airfoil installation angle of the blade root area 22 is reduced to effectively prevent the airflow in the area from blowing from the pressure surface of one blade 2 to the suction surface of the next blade 2, so that the working efficiency of the fan is improved; meanwhile, the wing profile installation angle of the top area 23 is larger than that of the blade root area 22, so that the air quantity and the air speed are increased, and the heat exchange performance of the outdoor unit of the air conditioner and the air outlet capacity of the louver are improved.
In another embodiment, when the airfoil stagger angle of the blade root region 22 is gradually increased from the hub 1 contact position to the interface 28 position, as shown in fig. 4, the airfoil stagger angle of the blade root region 22 is represented by θRoot of herbaceous plant，θRoot of herbaceous plantThe diameter of the concentric cylindrical surface of the hub 1 is gradually increased along the radial direction of the blade 2; the airfoil angle of the blade root region 22 has the maximum value and the minimum value from the circumferential surface of the hub 1 to the boundary surface 28, wherein the theta of the contact position of the blade 2 and the hub 1Root of herbaceous plantIs marked as thetaRoot of Teng (root of Teng)Theta of the position of said interface 28Root of herbaceous plantIs marked as thetaRoot max，15°≤θRoot of Teng (root of Teng)≤θRoot maxNot more than 45 degrees, when letting the airfoil profile erection angle of whole blade root region 22 when 15 ~ 45 degrees within ranges, can let effective reduction in the regional 22 circulating flow's of blade root gas flow after carrying out the operating mode simulation through CFD simulation software, let blade 2 improve the efficiency of doing work to the air.
Meanwhile, the airfoil profile mounting angle of the top area 23 is kept to be a constant value, and the airfoil profile mounting angle of the top area 23 is recorded as thetaTop roofAt this time, the airfoil setting angle of the tip region 23 may be set to a certain value, and θ may be set to a certain valueTop roof＝θRoot maxThe airfoil setting angle of the tip region 23 is made equal to the maximum angle value of the root region 22 at the position of the dividing plane 28; under the condition that the airfoil installation angle of the blade root region 22 is gradually increased along the radial direction of the blade 2 along with the increase of the diameter of the concentric cylindrical surface of the hub 1, namely in the range of 15-45 degrees, the airfoil installation angle of the top region 23 is always equal to the angle value of the blade root region 22 at the position of the interface 28, and the efficiency of increasing the air volume and the air speed can be met after the CFD simulation software is used for working condition simulation.
In another embodiment, the airfoil stagger angle of the root region 22 is maintained at a value such that the airfoil stagger angle of the root region 22 is less than the airfoil stagger angle of the tip region 23 by θRoot of herbaceous plantConstant value, then thetaRoot of herbaceous plant＝θRoot of Teng (root of Teng)＝θRoot max，20°≤θRoot of herbaceous plant<θTop roofNot more than 45 degrees; the airfoil-shaped installation angle formed by any section of the blade root region 22 from the circumferential surface of the hub 1 to the interface 28 is kept consistent and is selected between 20 degrees and 45 degrees, and theta is always satisfiedRoot of herbaceous plant<θTop roofThe blade root area 22 is small to facilitate airflow, and the top area 23 is large to increase the air quantity and the air speed.
In another embodiment, the airfoil stagger angle of the root region 22 is gradually increased along the radial direction of the blade 2 as the diameter of the concentric cylindrical surface of the hub 1 increases, and the airfoil stagger angle of the tip region 23 is also gradually increased along the radial direction of the blade 2 as the diameter of the concentric cylindrical surface of the hub 1 increases, wherein θTop roofThe diameter of the concentric cylindrical surface of the hub 1 is gradually increased along the radial direction of the blade 2, and theta is more than or equal to 15 degreesRoot of herbaceous plant<θTop roof≤45°。
In another embodiment, the airfoil stagger angle of the root region 22 is maintained at a constant value such that the airfoil stagger angle of the root region 22 is less than the tip regionWhen the airfoil setting angle of the region 23 is set, the airfoil setting angle of the tip region 23 is gradually increased along the radial direction of the blade 2 with the increase of the diameter of the concentric cylindrical surface of the hub 1, and at this time, θ is setTop roofThe diameter of the concentric cylindrical surface of the hub 1 is gradually increased along the radial direction of the blade 2, and theta is more than or equal to 15 degreesRoot of herbaceous plant<θTop roof≤45°。
In the above embodiments, the value range of the constant k needs to be limited to satisfy the requirement of rapidly obtaining the size parameter of the interface 28 after knowing the outer diameter of the fan, so as to facilitate the optimized design of the airfoil installation angles of the blade root region 22 and the top region 23 and satisfy the selection range mentioned in the above embodiments; when the constant is equal to or more than 0.4 and k is equal to or less than 0.6, the size parameter of the interface 28 meeting the optimization design can be effectively obtained when the constant k is selected to be between 0.4 and 0.6.
In order to illustrate that the parameter selection range mentioned in the above embodiment can quickly obtain the simulation model and the simulation test result of each parameter in the actual fan optimization design to guide the determination of the fan processing parameters in the actual production, the actual obtained value and the simulation test result of one of the dimensions are used for explaining, the blade 2 is divided into the blade root region 22 and the top region 23, and the airfoil mounting angle of the blade root region 22 is smaller than that of the top region 23, so that the effects of improving the useful power of the optimized fan and the efficiency of the fan can be brought.
For example, knowing that the fan diameter D in the prior art is 422mm, the setting angle of the contact position of the blade 2 and the hub 1 in the prior art fan is 32 °, and the airfoil setting angle of the blade 2 is gradually reduced from the blade root position to the blade tip position, and when a concentric cylindrical surface D of the hub 1 is selected to be larger than or equal to 0.55D, the airfoil setting angle is reduced to about 28.6 °.
The optimization design is carried out according to the optimization parameters provided in the embodiment of the existing fan, and other parameters of the existing fan are kept unchanged. The blade 2 is divided into a tip region 23 and a root region 22, and the diameter D of the concentric cylindrical surface of the hub 1 forming the dividing surface 28 is 0.55D, at this time, the airfoil setting angle of the root region 22 is reduced and the airfoil setting angle of the root region 22 is made to follow the radial direction of the blade 2The diameter of the concentric cylindrical surface of the hub 1 is increased and gradually increased to finally obtain thetaRoot of Teng (root of Teng)＝22°，θRoot max＝θTop roof＝28.6°。
The original fan and the optimized fan are arranged in the same air conditioner outdoor unit to carry out CFD numerical simulation, and under the condition of the same rotating speed, the results of air volume, shaft power and efficiency are obtained as follows:
it can be seen that the shaft power of the optimized fan is reduced by 4.6%, and the fan efficiency is improved by 2.6%. Therefore, the blade root region 22 and the top region 23 of the blade 2 are separated by the interface 28, and the airfoil setting angle of the blade root region 22 is smaller than that of the top region 23, so that the blade root region 22 can be effectively prevented from blowing air from the pressure surface of one blade 2 to the suction surface of the next blade 2 after the airfoil setting angle of the blade root region 22 is reduced, and the efficiency of the fan is improved.
In another embodiment, in order to ensure the overall uniformity and stable and reliable rotation of the rotating axial flow fan, the number of the blades 2 is at least two, and the blades 2 are uniformly distributed along the circumference of the hub 1; of course, in order to improve the adaptability of the axial flow fan to a larger air volume and avoid the situation that the air volume is reduced and the air pressure is reduced due to the fact that the air flow is too small to be divided, the number of the blades 2 is selected to be three.
In another embodiment, the axial flow fan is applied to an outdoor unit of an air conditioner, and an improved effect of the optimized axial flow fan can be obtained, and an outdoor unit of an air conditioner is provided, which includes an outdoor unit casing, and the axial flow fan as described in the above embodiments is installed in the outdoor unit casing, so that when the axial flow fan is operated, the heat exchange performance of the outdoor unit is improved, and the air outlet capacity in a louver on the outdoor unit is increased.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (10)
1. An axial fan, includes wheel hub (1) and sets up blade (2) on wheel hub (1) lateral wall, its characterized in that: the blade (2) comprises an airfoil (21), and the airfoil (21) is a section formed by intersecting a concentric cylindrical surface of the hub (1) and the blade (2);
the blade (2) comprises a blade root area (22) and a top area (23), and an interface (28) between the blade root area (22) and the top area (23) is a cross section which is intersected with the blade (2) when the diameter of a concentric cylindrical surface of the hub (1) is d;
the outer diameter of the fan is D, and D/D is a constant k;
the blade (2) comprises an airfoil center line (24) which is a central connecting line of all inscribed circles arranged along the contour line of the airfoil (21);
the blade (2) comprises a front edge (25) and a rear edge (26), the front edge (25) and the rear edge (26) are arranged oppositely and face towards the air inlet end of the hub (1) and the air outlet end of the hub (1) respectively;
the intersection point of the airfoil profile center line (24) and the leading edge (25) is a leading edge point, the intersection point of the airfoil profile center line (24) and the trailing edge (26) is a trailing edge point, and the connecting line of the leading edge point and the trailing edge point is a chord (27);
the included angle formed by the chord (27) and the vertical plane of the axis of the hub (1) is an airfoil mounting angle, and the airfoil mounting angle of the blade root area (22) is smaller than that of the top area (23).
2. The axial flow fan of claim 1, wherein: the airfoil setting angle of the blade root region (22) is thetaRoot of herbaceous plant，θRoot of herbaceous plantThe diameter of the concentric cylindrical surface of the hub (1) is gradually increased along the radial direction of the blades (2).
3. The axial flow fan of claim 2, wherein: theta of contact position of the blade (2) and the hub (1)Root of herbaceous plantIs marked as thetaRoot of Teng (root of Teng)Theta of the position of said interface (28)Root of herbaceous plantIs marked as thetaRoot max，15°≤θRoot of Teng (root of Teng)≤θRoot max≤45°。
4. The axial flow fan of claim 3, wherein: the airfoil setting angle of the top region (23) is thetaTop roof，θTop roof＝θRoot max。
5. The axial flow fan of claim 4, wherein: theta is describedRoot of herbaceous plantConstant value, then thetaRoot of herbaceous plant＝θRoot of Teng (root of Teng)＝θRoot max，20°≤θRoot of herbaceous plant＜θTop roof≤45°。
6. The axial flow fan of claim 4, wherein: theta is describedTop roofThe diameter of the concentric cylindrical surface of the hub (1) is increased along the radial direction of the blade (2) and gradually increased, and theta is more than or equal to 15 degreesRoot of herbaceous plant＜θTop roof≤45°。
7. The axial flow fan of claim 5, wherein: theta is describedTop roofThe diameter of the concentric cylindrical surface of the hub (1) is increased along the radial direction of the blade (2) and gradually increased, and theta is more than or equal to 15 degreesRoot of herbaceous plant＜θTop roof≤45°。
8. The axial-flow fan according to any one of claims 1 to 7, wherein: the constant k is more than or equal to 0.4 and less than or equal to 0.6.
9. The axial flow fan of claim 8, wherein: the number of the blades (2) is at least two, and the blades (2) are uniformly distributed along the circumference of the hub (1).
10. An air condensing units, includes outdoor unit casing, its characterized in that: the outdoor unit casing is provided with an axial flow fan according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922075474.3U CN210889456U (en) | 2019-11-27 | 2019-11-27 | Axial fan and air condensing units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922075474.3U CN210889456U (en) | 2019-11-27 | 2019-11-27 | Axial fan and air condensing units |
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| Publication Number | Publication Date |
|---|---|
| CN210889456U true CN210889456U (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922075474.3U Active CN210889456U (en) | 2019-11-27 | 2019-11-27 | Axial fan and air condensing units |
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| CN (1) | CN210889456U (en) |
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- 2019-11-27 CN CN201922075474.3U patent/CN210889456U/en active Active
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