CN203384106U - Small axial flow fan device with semi-cylindrical convex chamfer blades - Google Patents

Small axial flow fan device with semi-cylindrical convex chamfer blades Download PDF

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Publication number
CN203384106U
CN203384106U CN201320397173.2U CN201320397173U CN203384106U CN 203384106 U CN203384106 U CN 203384106U CN 201320397173 U CN201320397173 U CN 201320397173U CN 203384106 U CN203384106 U CN 203384106U
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Prior art keywords
blade
cylindrical tongue
cylindrical
semi
tongue
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Expired - Fee Related
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CN201320397173.2U
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Chinese (zh)
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金英子
朱立夫
张立
吴泳敏
李国琪
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Abstract

The utility model discloses a small axial flow fan device with semi-cylindrical convex chamfer blades, wherein the semi-cylindrical convex chamfer blades are arranged on a hub at equal distance along the circumferential direction, the hub is connected with an output shaft of a motor, the motor is fixed on a motor fixed frame, the motor fixed frame is fixed in a box, the motor and a wire connector are respectively arranged on the two ends of a wire, a power supply is connected outside the wire connector, the semi-cylindrical convex chamfer blades consist of blades and semi-cylindrical convex chambers which are integrally formed, n semi-cylindrical convex chamfers are arranged on each blade pressure plane, the semi-cylindrical convex chamfers are semi-cylindrical bodies, the diameters of the semi-cylindrical bodies are 1mm, the radial distances between adjacent semi-cylindrical convex chamfers are 6mm, the radial distances between blade tips and the semi-cylindrical convex chamfers close to the blade tips and blade roofs respectively are 2mm and 1mm, and the installation angles of the blade tips and the blade roofs of the semi-cylindrical convex chamfer blades are all 48 degrees. The small axial flow fan device with the semi-cylindrical convex chamfer blades obviously enhances static pressure and efficiency, and effectively reduces noise of a fan in a certain frequency range.

Description

A kind of device of the small axial flow fan with half-cylindrical tongue blade
Technical field
The utility model belongs to the fan technical field, relates in particular to a kind of device of the small axial flow fan with half-cylindrical tongue blade.
Background technique
(refer to that impeller diameter is less than 200mm, air quantity is less than 1000m to small axial flow fan 3the fan of/h) very extensive in sector applications such as the civil electric appliances such as air-conditioning, refrigerator, computer and electric drier and chemical industry, machineries.These fans will produce certain energy loss in running, although the energy consumption of every desk fan is little, and because the quantity of this class fan is very huge, total energy loss or considerable.
With respect to the big-and-middle-sized blower fan of high pressure ratio, large flow, small axial flow fan has that size is little, flow and voltage rise is low, wasted work high not, and it often is operated in stall zone.Because the requirement of small-sized fans performance is not to pursue to heavens high efficiency as big-and-middle-sized blower fan, and more focus on producing enough large flow, pressure with small impeller size, to adapt to the demand of heat radiation.Therefore high-performance, low noise are the targets that desirable fan vane type will reach, and this has maximum efficiency, low-loss, maximum volumetric flow rate (being ventilation) etc. comprising blade profile.In addition, low noise is also the target of current small axial flow fan development.
Therefore, the description based on above-mentioned, in the urgent need to changing the shape of axial fan blade, design a kind of new small axial flow fan, improves static pressure and the efficiency of fan with this, and can reduce the noise of fan assembly.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, and a kind of device of the small axial flow fan with half-cylindrical tongue blade is provided, so that the static pressure of fan and efficiency improve, and reducing noise.
The utility model comprises casing, motor fixing frame, motor, wheel hub, half-cylindrical tongue blade, half-cylindrical tongue blade is along circumferentially equidistantly being arranged on wheel hub, wheel hub is connected with motor output shaft, and motor is fixed on motor fixing frame, and motor is fixed in casing; One end of wire is connected with motor, and the other end is connected with conducting wire connector; The conducting wire connector ABAP Adapter.
The cross section of described casing is quadrilateral, and four angle ends all have tapped through hole, for fixing of casing.
Half-cylindrical tongue blade is bending blade profile or circular arc template prismatic blade, determines according to the actual requirements.Half-cylindrical tongue blade is comprised of integrated blade and half-cylindrical tongue, the number of half-cylindrical tongue is the n bar, and all be arranged on the pressure side of blade, half-cylindrical tongue tightly is attached on blade along the curved surface of the pressure side of blade, the chord length of blade is pushed up blade root from leaf and is reduced gradually, the leaf top chord is long is 30mm, and the blade root chord length is 15mm;
The diameter of the cylinder of half-cylindrical tongue is lmm, and the radial spacing between half-cylindrical tongue is preferably 6mm, and the half-cylindrical tongue pushed up near leaf is apart from the radial distance on leaf top d 1preferred 2mm, the half-cylindrical tongue of close blade root is apart from the radial distance of blade root d 2preferred 1mm; Half-cylindrical tongue two ends are apart from the equal preferred 2mm of the distance of blade inlet edge and trailing edge, and the established angle at half-cylindrical tongue blade and blade top and blade root place is 48 °;
The number that arranges of described half-cylindrical tongue determines according to the radial length of blade, and the preferred distance between adjacent half-cylindrical tongue has following two kinds of selection modes:
The first is the spacing between half-cylindrical tongue dall identical, after half-cylindrical tongue number n determines according to the actual requirements, dcan be obtained by following formula:
Figure 2013203971732100002DEST_PATH_IMAGE002
The second is the spacing between half-cylindrical tongue dnon-uniform Distribution can be obtained by following formula:
Here kfor spread ratio, kconcrete value can comprehensively determine according to the number of primitive level in fan blade number, blade radial diameter and vane airfoil profile design theory.
The half-cylindrical tongue length of described n bar is all not identical, the midline length decision of the blade profile of the leaf grating of the radial position of the blade that the length of half-cylindrical tongue is positioned by it, and the length of the half-cylindrical tongue of n bar is pushed up blade root from leaf and is reduced gradually.The line at half-cylindrical tongue two ends is mutually vertical with the blade radial center line, and the line at the half-cylindrical tongue two ends of each on individual blade is different surface beeline each other, and the angle between them is determined by the angle of leaf curling.
The utlity model has following good effect:
The utility model can improve static pressure-Flow characteristics and the efficiency-Flow characteristics of prototype fan, especially when flow is greater than 0.006 kg/s, it is obviously better than the prototype fan that static pressure of the present utility model and efficiency are wanted, simultaneously at 4.5(kHz) ~ 5.6(kHz) and 9(kHz) ~ 11.2(kHz) on frequency range, the utility model can reduce noise to a certain extent, and the half-cylindrical tongue of blade is also different to the influence of noise degree on each frequency range.
The accompanying drawing explanation
Fig. 1 is the utility model preferred embodiment scheme of installation;
Fig. 2 is half-cylindrical tongue blade schematic diagram;
Fig. 3 is prototype blade fan and the utility model p-Qperformance curve contrast schematic diagram;
Fig. 4 is prototype blade fan and the utility model η-Qefficiency curve contrast schematic diagram;
Fig. 5 is 1/3 times of frequency division of noise figure that prototype blade fan and the utility model are monitored from rotor center 50mm place at outlet area;
In figure, casing 1, motor fixing frame 2, motor 3, wheel hub 4, half-cylindrical tongue blade 5, tapped through hole 6, wire 7, conducting wire connector 8, leaf top 9, blade root 10, half-cylindrical tongue 11, pressure side 12, leading edge 13, trailing edge 14.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, a kind of device of the small axial flow fan with half-cylindrical tongue blade, comprise casing 1, motor fixing frame 2, motor 3, wheel hub 4, half-cylindrical tongue blade 5, half-cylindrical tongue blade 5 is along circumferentially equidistantly being arranged on wheel hub 4, wheel hub 4 is connected with motor 3 output shafts, motor 3 is fixed on motor fixing frame 2, and motor fixing frame 2 is fixed in casing 1; One end of wire 7 is connected with motor 3, and the other end is connected with conducting wire connector 8; Conducting wire connector 8 ABAP Adapter.
The cross section of described casing 1 is quadrilateral, and four angle ends all have tapped through hole 6, for fixing of casing.
As shown in Figure 2, the utility model preferred embodiment fan impeller outer diameter is 84mm, and hub diameter is 30mm, and hub height is 14mm, and blade tip clearance is 1mm, and the number of blade is 7.
Described half-cylindrical tongue blade 5 is for being preferably the bending blade profile, circular arc template prismatic blade also can according to the actual requirements, half-cylindrical tongue blade 5 is comprised of integrated blade and half-cylindrical tongue 11, be provided with 5 half-cylindrical tongues 11 on each blade, they all are arranged on the pressure side 12 of blade, half-cylindrical tongue 11 tightly is attached on blade along the curved surface of the pressure side 12 of blade, the chord length of blade reduces to blade root 10 gradually from leaf top 9, it is 30mm that leaf pushes up 9 chord lengths, blade root 10 chord lengths are 15mm, the semicylinder that half-cylindrical tongue 11 is diameter 1mm, radial spacing between half-cylindrical tongue is preferably 6mm, push up the radial distance of 9 half-cylindrical tongue apart from the leaf top near leaf d 1be preferably 2mm, preferred apart from the radial distance of blade root near the half-cylindrical tongue of blade root d 2for 1mm, half-cylindrical tongue two ends all are preferably 2mm apart from the distance of blade inlet edge 13 and trailing edge 14, and the established angle at half-cylindrical tongue blade and blade top and blade root place is 48 °, article 5, the length of half-cylindrical tongue 11 is all not identical, the midline length decision of the blade profile of the leaf grating of the radial position of the blade that the length of half-cylindrical tongue 11 is positioned by it, and the length of 5 half-cylindrical tongues 11 reduces to blade root 10 gradually from leaf top 9.The line at half-cylindrical tongue 11 two ends is mutually vertical with the blade radial center line, and the line at the half-cylindrical tongue two ends of each on individual blade is different surface beeline each other, and the angle between them is determined by the angle of leaf curling.
The number that arranges of described half-cylindrical tongue determines according to the radial length of blade, and the preferred distance between half-cylindrical tongue has following two kinds of selection modes:
The first is the spacing between half-cylindrical tongue dall identical, after half-cylindrical tongue number n determines according to the actual requirements, dcan be obtained by following formula:
Figure 835286DEST_PATH_IMAGE002
The second is the spacing between half-cylindrical tongue dnon-uniform Distribution can be obtained by following formula:
Figure 417446DEST_PATH_IMAGE004
Wherein, kfor spread ratio, kconcrete value can comprehensively determine according to the number of primitive level in fan blade number, blade radial diameter and vane airfoil profile design theory.
As shown in Figure 3, be prototype blade fan and the utility model p-Qperformance curve contrast schematic diagram, analyze from integral image, and the static pressure-Flow characteristics of the half-cylindrical tongue fan of blade model prototype fan is better than prototype fan model static pressure-Flow characteristics generally; Only, when mass flow rate is less than 0.006 (kg/s), the static pressure-flow curve of prototype fan model is better than the half-cylindrical convex groove type fan of blade.Therefore, single from p-Qcurve sees, the utility model has obvious effect to the raising of static pressure.
As shown in Figure 4, be prototype blade fan and the utility model η-Qefficiency curve contrast schematic diagram, in different range of flows, the efficiency value of the half-cylindrical convex groove type fan of prototype fan model and blade model has different situations.When flow is less than 0.006 kg/s, the half-cylindrical tongue on blade can not improve the efficiency value of fan; When flow is greater than 0.006kg/s, the efficiency value of the half-cylindrical convex groove type fan of blade model is greater than the efficiency value of prototype fan model, and its maximum efficiency value is greater than the maximum efficiency value of prototype fan.Although the efficiency value of the half-cylindrical convex groove type fan model of blade band when flow is greater than 0.02kg/s be for how many and do not know, singly from η-Qcurve sees, the utility model can obviously improve the efficiency of axial fan in the certain flow scope.
As shown in Figure 5, for prototype blade fan and the utility model at outlet area 1/3 times of frequency division of noise figure from the monitoring of rotor center 50mm place, as can be seen from the figure, frequency is at 4.5(kHz) ~ 5.6(kHz) and 9(kHz) ~ 11.2(kHz) in scope, the A level sound pressure level of the half-cylindrical tongue fan of blade is lower than the prototype fan, in other frequency range, the A level sound pressure level of the half-cylindrical tongue fan of blade is all high than prototype fan; Along with the increase of frequency, each frequency range of A level sound pressure level also increases, but each band limits of two fan models is identical.Therefore, at 4.5(kHz) ~ 5.6(kHz) and 9(kHz) ~ 11.2(kHz) on frequency range, the utility model can reduce noise to a certain extent, and the half-cylindrical tongue of blade is also different to the influence of noise degree on each frequency range.
The utility model working procedure is as follows:
Gas axially enters impeller from intake grill, as shown in Figure 2, with the blade that there is no half-cylindrical tongue, compare, on the pressure side of blade, design has increased by five half-cylindrical tongues, become half-cylindrical tongue blade, air-flow, under the effect of half-cylindrical tongue blade, makes the minimum static pressure of suction surface be become and only be appeared at the blade center by 2/3 place that originally appeared at blade center and leaf top chord length, and the distribution of pressure side zone of high pressure more approaches trailing edge.At exhaust outlet, the eddy current vanishing point moves down simultaneously, and flow field current stabilization intensity descends, and the outlet port vorticity reduces, and makes noise descend to some extent.Therefore, in this process, the utility model can improve static pressure-Flow characteristics and the efficiency-Flow characteristics of prototype fan, especially when flow is greater than 0.006 kg/s, it is obviously better than the prototype fan that static pressure of the present utility model and efficiency are wanted, simultaneously at 4.5(kHz) ~ 5.6(kHz) and 9(kHz) ~ 11.2(kHz) on frequency range, the utility model can reduce noise to a certain extent, and the half-cylindrical tongue of blade is also different to the influence of noise degree on each frequency range.
Those skilled in the art it should be understood that can carry out various improvement and change to this invention in the situation that do not break away from summary of the invention.Therefore according to technical spirit of the present utility model, the simple modification that the utility model is done and various similar changes and improvements, within all should belonging to the utility model technical scope.

Claims (5)

1. the device of the small axial flow fan with half-cylindrical tongue blade, is characterized in that comprising casing, motor fixing frame, motor, wheel hub, half-cylindrical tongue blade;
Half-cylindrical tongue blade is along circumferentially equidistantly being arranged on wheel hub, and wheel hub is connected with motor output shaft, and motor is fixed on motor fixing frame, and motor is fixed in casing; One end of wire is connected with motor, and the other end is connected with conducting wire connector, the conducting wire connector ABAP Adapter;
The cross section of described casing is quadrilateral, and four angle ends all have tapped through hole, for fixing of casing.
2. a kind of device of the small axial flow fan with half-cylindrical tongue blade as claimed in claim 1 is characterized in that:
Half-cylindrical tongue blade is the bending blade profile, by integrated blade and half-cylindrical tongue, formed, be provided with the half-cylindrical tongue of n bar on each blade, and all be arranged on the pressure side of blade, half-cylindrical tongue only is attached on blade along the curved surface of the pressure side of blade, the chord length of blade is pushed up blade root from leaf and is reduced gradually, and the leaf top chord is long is 30mm, and the blade root chord length is 15mm.
3. a kind of device of the small axial flow fan with half-cylindrical tongue blade as claimed in claim 2 is characterized in that:
The diameter of the cylinder of half-cylindrical tongue is lmm, and the radial spacing between half-cylindrical tongue is preferably 6mm, and the half-cylindrical tongue pushed up near leaf is apart from the radial distance, d on leaf top 1for 2mm, the half-cylindrical tongue of close blade root is apart from the radial distance, d of blade root 2for 1mm; Half-cylindrical tongue two ends are 2mm apart from the distance of blade inlet edge and trailing edge, and the established angle at half-cylindrical tongue blade and blade top and blade root place is 48 °.
4. a kind of device of the small axial flow fan with half-cylindrical tongue blade as claimed in claim 2 is characterized in that:
The number n that arranges of described half-cylindrical tongue determines according to the radial length of blade, and the spacing between adjacent half-cylindrical tongue is selected as follows:
If the space D between half-cylindrical tongue is all identical, after half-cylindrical tongue number n determines according to the actual requirements, D can be obtained by following formula:
Figure FDA00003457695200011
If the space D non-uniform Distribution between half-cylindrical tongue can be obtained by following formula:
D=k(L-d 1-d 2)
Wherein, k is spread ratio, and the concrete value of k can comprehensively determine according to the number of primitive level in fan blade number, blade radial diameter and vane airfoil profile design theory.
5. a kind of device of the small axial flow fan with half-cylindrical tongue blade as claimed in claim 2 is characterized in that:
The half-cylindrical tongue length of n bar is all not identical, the midline length decision of the blade profile of the leaf grating of the radial position of the blade that the length of half-cylindrical tongue is positioned by it, and the length of the half-cylindrical tongue of n bar is pushed up blade root from leaf and is reduced gradually; The line at half-cylindrical tongue two ends is mutually vertical with the blade radial center line, and the line at the half-cylindrical tongue two ends of each on individual blade is different surface beeline each other, and its angle is by the angle decision of leaf curling.
CN201320397173.2U 2013-07-03 2013-07-03 Small axial flow fan device with semi-cylindrical convex chamfer blades Expired - Fee Related CN203384106U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103334954A (en) * 2013-07-03 2013-10-02 浙江理工大学 Small axial flow fan device provided with semi-cylindrical convex groove blades
CN104564802A (en) * 2015-01-06 2015-04-29 浙江理工大学 Novel volute-less centrifugal ventilator with resistance reduction grooves

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103334954A (en) * 2013-07-03 2013-10-02 浙江理工大学 Small axial flow fan device provided with semi-cylindrical convex groove blades
CN103334954B (en) * 2013-07-03 2016-02-17 浙江理工大学 A kind of small axial flow fan device of blade band semi-cylindrical tongue
CN104564802A (en) * 2015-01-06 2015-04-29 浙江理工大学 Novel volute-less centrifugal ventilator with resistance reduction grooves
CN104564802B (en) * 2015-01-06 2017-02-22 浙江理工大学 Volute-less centrifugal ventilator with resistance reduction grooves

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140108

Termination date: 20160703

CF01 Termination of patent right due to non-payment of annual fee