CN109595197A - A kind of blower - Google Patents

A kind of blower Download PDF

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Publication number
CN109595197A
CN109595197A CN201811496621.8A CN201811496621A CN109595197A CN 109595197 A CN109595197 A CN 109595197A CN 201811496621 A CN201811496621 A CN 201811496621A CN 109595197 A CN109595197 A CN 109595197A
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CN
China
Prior art keywords
blade
substrate
arc
outlet
shroud
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CN201811496621.8A
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Chinese (zh)
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CN109595197B (en
Inventor
唐育萍
徐绍斌
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FOSHAN HAINAN JIUZHOU POPULA FAN Co Ltd
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FOSHAN HAINAN JIUZHOU POPULA FAN Co Ltd
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30Vanes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663Sound attenuation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence

Abstract

The invention discloses a kind of blowers, including casing, motor is provided on one end face of the casing, air inlet is provided on the other end of the casing, air inlet cylinder is provided in the air inlet, air outlet is provided on the outer peripheral surface of the casing, impeller is provided in the casing, the impeller includes substrate, blade, shroud, air-out cavity is formed between the substrate and the shroud, the air inlet, air outlet is interconnected with the air outlet, the blade is arc-shaped, the arc core of the blade is in the substrate, the proximal part of the blade is inlet angle, the distal end of the blade is the angle of outlet, the line in the angle of outlet to the substrate center of circle is telecentricity radius, the optimal structural design that the present invention provides blades on blower, and the air inlet cylinder and shroud that use improve the outlet air efficiency of blower, it reduces Whole power consumption is run more stable steady.

Description

A kind of blower
Technical field
The present invention relates to a kind of blowers.
Background technique
The mobility and gas-flow resistance of traditional air inlet largely using cone and small arcuate structure, when air inlet Greatly, to generate the flowing eddy current crack of air-flow, the impeller front disc of blower also uses cone and small arcuate structure, the small arc of blade Shape and short runner, gas energizer can be small, and air output is small, and the blade of the straight-plate-type or cone used increases air-flow resistance Power, outlet hypsokinesis blade are easy to appear " surge " phenomenon, increase noise when fan operation, and structural stability is poor, and It needs to increase power consumption using the biggish motor of power.
Summary of the invention
The technical problem to be solved by the present invention is needing a kind of blower, energy consumption can be reduced, improve outlet air efficiency, and drop The noise generated when low operation.
The solution that the present invention solves its technical problem is: a kind of blower, including casing, on an end face of the casing It is provided with motor, air inlet is provided on the other end of the casing, air inlet cylinder, the casing are provided in the air inlet Outer peripheral surface on be provided with air outlet, be provided with impeller in the casing, the impeller includes and the output end of the motor passes Substrate, the circumference array of dynamic connection are distributed in several pieces of blades of the substrate medial surface, are set to the blade far from described The shroud of substrate side, forms air-out cavity between the substrate and the shroud, the air inlet and outlet with it is described go out Air port be interconnected, the blade be arc-shaped, the arc core of the blade in the substrate, the proximal part of the blade be into Bicker, the distal end of the blade are the angle of outlet, and the line of the angle of outlet to the substrate center of circle is telecentricity radius, described remote Heart radius is fitted the diameter that the fitting diameter of a circle to be formed is less than the substrate, the tangent line of the angle of outlet and the telecentricity radius Vertical line to be formed by angle be A, the range of the A is 148 degree to 152 degree, and the arc radius of the blade is R, the leaf The arc length of piece is L, and the diameter of the substrate is D, and the distance in arc core to the substrate center of circle of the blade is r, R:D=0.45 ~0.47, L:D=0.4~0.42, r:D=0.225~0.235.
As a further improvement of the above technical scheme, the tangent line of the inlet angle of blade described in any block blade adjacent thereto The distance between the tangent line of the angle of outlet be runner exit width, the value of the runner exit width is d, L:d=2.96.
As a further improvement of the above technical scheme, A is 152 degree.
As a further improvement of the above technical scheme, R:D=0.466.
As a further improvement of the above technical scheme, L:D=0.415.
As a further improvement of the above technical scheme, r:D=0.233.
As a further improvement of the above technical scheme, the shroud is rotary structure, and the bus of the shroud is circle The outer diameter of arcuation, the shroud is gradually increased along the direction of the shroud to the substrate.
As a further improvement of the above technical scheme, the arc radius of the shroud bus is M, R:M=2.74.
As a further improvement of the above technical scheme, the air inlet cylinder is rotary structure, the bus of the air inlet cylinder Including flat segments, the segmental arc being connected with described flat segments one end, the center of circle of the segmental arc is set to the air inlet cylinder Outside, the segmental arc protrude into the shroud far from one end of the flat segments.
As a further improvement of the above technical scheme, the arc radius of the segmental arc is N, R:N=2.74.
Beneficial effect using above-mentioned further scheme is: using the fan blade of spherical arc shape, blower resistance is effectively reduced, and And runner is extended, it increase gas energizer can, avoid the phenomenon that outlet hypsokinesis blade generates " surge ", reduce blower The noise generated when operating reduces power consumption, and the shroud of blower, air inlet cylinder equally use circular-arc-shaped design, further decrease Blower resistance, not only reduces inflow noise, also reduces vortex and return loss, it is ensured that air-flow through in air inlet space it is logical Smooth efficient, more other same model centrifugal fan products, fan efficiency reaches 88%, and the power of necessary electromotor is small, than similar The noise of blower low 10~15%, can be applied to that environment protection ventilating, spraying spray painting dedusting, oil smoke staticizer be mating and exhaust-gas treatment Deng.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly described.Obviously, described attached drawing is a part of the embodiments of the present invention, rather than is all implemented Example, those skilled in the art without creative efforts, can also be obtained according to these attached drawings other designs Scheme and attached drawing.
Fig. 1 is substrate of the invention, blade schematic elevation view.
Fig. 2 is whole schematic side view of the invention.
Fig. 3 is stereoscopic schematic diagram of the invention.
In figure: 1- casing, 2- air outlet, 3- enter the wind cylinder, 4- motor, 5- substrate, 6- blade, 7- shroud, 8- flat segments, 9- Segmental arc.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to design of the invention, specific structure and generation clear Chu is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair Bright a part of the embodiment, rather than whole embodiments, based on the embodiment of the present invention, those skilled in the art are not being paid Other embodiments obtained, belong to the scope of protection of the invention under the premise of creative work.In addition, be previously mentioned in text All connection relationships not singly refer to that component directly connects, and referring to can be according to specific implementation situation, by adding or reducing connection Auxiliary, Lai Zucheng more preferably connection structure.Each technical characteristic in the invention, under the premise of not conflicting conflict It can be with combination of interactions.
Referring to Fig.1, Fig. 2, Fig. 3, a kind of blower, including casing 1 are provided with motor 4, institute on an end face of the casing 1 It states and is provided with air inlet on the other end of casing 1, be provided in the air inlet and enter the wind cylinder 3, on the outer peripheral surface of the casing 1 It is provided with air outlet 2, impeller is provided in the casing 1, the impeller includes being sequentially connected with the output end of the motor 4 Substrate 5, circumference array are distributed in several pieces of blades 6 of 5 medial surface of substrate, are set to the blade 6 far from the substrate 5 The shroud 7 of side, forms air-out cavity between the substrate 5 and the shroud 7, the air inlet and outlet 2 with it is described go out Air port 2 is interconnected, and the blade 6 is arc-shaped, and the arc core of the blade 6 is in the substrate 5, the nearly heart of the blade 6 End is inlet angle, and the distal end of the blade 6 is the angle of outlet, and the line of the angle of outlet to 5 center of circle of substrate is telecentricity half Diameter, the telecentricity radius are fitted the diameter that the fitting diameter of a circle to be formed is less than the substrate 5, the tangent line of the angle of outlet and institute It is A that the vertical line for stating telecentricity radius, which is formed by angle, and the range of the A is 148 degree to 152 degree, the arc radius of the blade 6 For R, the arc length of the blade 6 is L, and the diameter of the substrate 5 is D, the arc core of the blade 6 to 5 center of circle of substrate away from From for r, R:D=0.45~0.47, L:D=0.4~0.42, r:D=0.225~0.235 is driven by motor 4, drives substrate 5 rotations, the blade 6 on substrate 5 rotate in the air-out cavity between substrate 5 and shroud 7, from the air inlet cylinder 3 of air inlet into Wind is discharged to air-out cavity, then from air outlet 2 in wind, and the present invention designs 6 full wafer of blade in the arc-shaped, and exists for blade 6 Required by design position on substrate 5 also has, it is A, blade 6 that the tangent line of the angle of outlet, which is formed by angle with the vertical line of telecentricity radius, Arc radius be R, the arc length of blade 6 is L, and the diameter of substrate 5 is D, and the distance in arc core to the center of circle of substrate 5 of blade 6 is R, in these numerical definiteness, length unit is unified, according to the ratio of the arc radius R of blade 6 and 5 diameter D of substrate 0.45 In the range of~0.47, it may be determined that the value of the arc radius R of blade 6, according to the ratio of the arc length L of blade 6 and the diameter D of substrate 5 Value is in 0.4~0.42 range, it may be determined that the arc length of blade 6, according to the ratio of distance r and 5 diameter D of substrate 0.225~ In the range of 0.235, the position of blade 6 on the substrate 5 is defined, telecentricity radius is fitted the fitting diameter of a circle to be formed less than base The diameter of plate 5, so that the angle of outlet is formed in substrate 5, then by limiting angle of outlet tangent line and the vertical line of telecentricity radius always Included angle A 148 to 152 degree in the range of, it may be determined that the swing angle of blade 6 on the substrate 5 so far can determine that blade 6 exists Structure setting on substrate 5, arc-shaped blade 6 reduce gas-flow resistance, avoid outlet hypsokinesis blade 6 and generate " surge " now As reducing noise when fan operation, the design of blade 6 of lengthening increase gas energizer can, add the intake of gas Greatly, it can be achieved that obtaining same air output in the case where, power required for blower is less, realizes efficient outlet air.
It is further used as preferred embodiment, the blade 6 adjacent thereto of the tangent line of the inlet angle of blade 6 described in any block The distance between tangent line of the angle of outlet is runner exit width, and the value of the runner exit width is d, L:d=2.96, according to L With the ratio of d, that is, it can determine the quantity that blade 6 is arranged, blade 6 is provided with 8 pieces under this ratio, and structure is more reasonable, further Improve intake.
Being further used as preferred embodiment A is 152 degree, R:D=0.466, L:D=0.415, r:D=0.233, this It is designed for optimal structure.
It is further used as preferred embodiment, the shroud 7 is rotary structure, and the bus of the shroud 7 is circular arc The outer diameter of shape, the shroud 7 is gradually increased along the direction of the shroud 7 to the substrate 5, and the mellow and fullization design of shroud 7 can make The gas-flow resistance that blade 6 must be entered is smaller.
It is further used as preferred embodiment, the arc radius of 7 bus of shroud is M, R:M=2.74, before this is The structure optimal value of 7 bus of disk, can reach more efficient outlet air with hing straps 6.
It is further used as preferred embodiment, the air inlet cylinder 3 is rotary structure, the bus packet of the air inlet cylinder 3 The segmental arc 9 for including flat segments 8, being connected with described 8 one end of flat segments, the center of circle of the segmental arc 9 are set to the air inlet cylinder 3 Outside, the segmental arc 9 protrudes into the shroud 7 far from one end of the flat segments 8, and the structure design of flat segments 8 can make Cylinder 3 must be entered the wind more easily to be installed on casing 1, using the air inlet cylinder 3 of arc, inflow noise can be further decreased, reduce gas Flow resistance power, reduce vortex and return loss so that air-flow enter when impeller it is more unobstructed efficiently.
It is further used as preferred embodiment, the arc radius of the segmental arc 9 is N, R:N=2.74, this is air inlet The structure optimal value of cylinder 3, can reach more efficient outlet air with hing straps 6.
In order to further verify the working effect of blower, carry out first group of experiment test, to it is existing using straight-plate-type and The draught fan impeller of short runner is tested, it is connect with 8 kinds of air ducts, 8 kinds of different operating conditions is obtained, obtains experimental data such as table Shown in 1:
Table 1:
Using arc-shaped blade, and R:D=0.45 is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, It is as shown in table 2 to obtain experimental data:
Table 2:
Using arc-shaped blade, and R:D=0.46 is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, It is as shown in table 3 to obtain experimental data:
Table 3:
Using arc-shaped blade, and R:D=0.466 is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different works It is as shown in table 4 to obtain experimental data for condition:
Table 4:
Using arc-shaped blade, and R:D=0.47 is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, It is as shown in table 3 to obtain experimental data:
Table 5:
By upper 1~table of table 5 it is found that with straight-plate-type, short runner fan blade compared with, using after arc-shaped blade, The quiet efficiency of the axis of blower is opposite to be improved, and impeller power, than A sound level relative reduction, therefore circular arc vane is more straight than traditional Plate blade it is more efficient, under identical air output, power consumption is lower, and noise is less, then 2~table of contrast table 5 it is found that It is between 0.45~0.466 in R:D, the quiet efficiency of axis is in the trend risen, and impeller power is in downward trend, under being in than A sound level The trend of drop, but when R:D is 0.47, when opposite R:D is 0.466, the quiet efficiency relative drop of axis, impeller power relative increase, It is held essentially constant than A sound level, is at this time the optimal value of structure when R:D is 0.466 therefore.
On the basis of keeping R:D is 0.466, change the ratio of L and D, carries out second group of experiment measurement, take L:D= 0.4, it is connect with 8 kinds of air ducts, 8 kinds of different operating conditions is obtained, it is as shown in table 6 to obtain experimental data:
Table 6:
L:D=0.41 is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, obtains experimental data such as 7 institute of table Show:
Table 7:
L:D=0.415 is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, obtains experimental data such as 8 institute of table Show:
Table 8:
L:D=0.42 is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, obtains experimental data such as 9 institute of table Show:
Table 9:
By 6~table of table 9 it is found that being between 0.4~0.415 in L:D, the quiet efficiency of axis is in the trend risen, impeller power Downward trend is in downward trend than A sound level, and the efficiency of blower is in the trend being continuously improved, but when L:D is 0.42, phase When being 0.415 to L:D, the quiet efficiency relative drop of axis, impeller power relative increase is held essentially constant than A sound level, therefore, when It is at this time the optimal value of structure when L:D is 0.415.
On the basis of holding R:D is 0.466, L:D is 0.415, change the ratio of R and r, carries out the experiment of third group and survey Amount, takes r:D=0.225, it is connect with 8 kinds of air ducts, 8 kinds of different operating conditions is obtained, it is as shown in table 10 to obtain experimental data:
Table 10:
R:D=0.23 is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, obtains experimental data such as 11 institute of table Show:
Table 11:
R:D=0.233 is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, obtains experimental data such as 12 institute of table Show:
Table 12:
R:D=0.235 is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, obtains experimental data such as 13 institute of table Show:
Table 13:
By table 10~13 it is found that in r:D between 0.225~0.235, the quiet efficiency of axis is in the trend risen, impeller power It is in downward trend than A sound level in downward trend, the efficiency of blower theoretically takes r:D=in the trend being continuously improved When 0.235, fan efficiency is optimal value, but in actual production, when taking r:D=0.235, due to blade basal disc more The position at edge, in impeller high-speed rotation, the centrifugal force of blade is larger, is easy to cause the unstable of structure, and works as and take r:D= When 0.223, blade had both kept higher outlet air efficiency, and did not influenced the stability of structure, and when wheel rotation is maintained at steady State be therefore optimal value when taking r:D=0.233 from the aspect of Comprehensive service life and structural stability.
To keep R:D be 0.466, L:D 0.415, on the basis of taking r:D=0.233, change the tangent line of the angle of outlet and remote The vertical line of heart radius is formed by the range of included angle A, carries out the 4th group of experiment measurement, takes A=148 degree, it is connected with 8 kinds of air ducts It connects, obtains 8 kinds of different operating conditions, it is as shown in table 14 to obtain experimental data:
Table 14:
A=150 degree is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, obtains experimental data such as 15 institute of table Show:
Table 15:
A=152 degree is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, obtains experimental data such as 16 institute of table Show:
Table 16:
A=153 degree is taken, it is connect with 8 kinds of air ducts, obtains 8 kinds of different operating conditions, obtains experimental data such as 17 institute of table Show:
Table 17:
By 14~table of table 17 it is found that in A between 148~152 degree, the quiet efficiency of axis is in the trend risen, impeller power Downward trend is in downward trend than A sound level, and the efficiency of blower is in the trend being continuously improved, but when A is 153 degree, relatively When A is 152 degree, since total pressure is in downward trend in impeller, also relative reduction, the quiet efficiency relative drop of axis cause shaft efficiency Impeller power relative increase, is held essentially constant than A sound level, is at this time the optimal value of structure when A is 152 degree therefore.
The length unit of above four groups of experiments is unified for CM.
In conclusion the experiment in conjunction with first group to the 4th group measures, by change the radian of blade, blade arc length, Position of the blade on substrate, blade swing angle, obtain and work as R:D=0.466, L:D=0.415, r:D=0.233, A= At 152 degree, the structure of draught fan impeller is optimal, and effectively reduces blower resistance, and extend runner, makes gas energizer It can increase, avoid the phenomenon that outlet hypsokinesis blade generates " surge ", reduce the noise generated when blower operating, reduce function Consumption, and the shroud of blower, air inlet cylinder equally use circular-arc-shaped design, and R:M 2.74, R:N 2.74 further reduced wind Machine resistance not only reduces inflow noise, also reduces vortex and return loss, it is ensured that air-flow passes through the unobstructed height for entering the wind interior space Effect, more other same model centrifugal fan products, increase blower is directly proportional per hour, and fan efficiency reaches 88%, mating electricity The power of machine is small, and lower than the noise of similar blower 10~15%, it can be applied to environment protection ventilating, spraying spray painting dedusting, oil smoke staticize Device is mating and exhaust-gas treatment etc..
Better embodiment of the invention is illustrated above, but the invention is not limited to the implementation Example, those skilled in the art can also make various equivalent modifications on the premise of without prejudice to spirit of the invention or replace It changes, these equivalent variation or replacement are all included in the scope defined by the claims of the present application.

Claims (10)

1. a kind of blower, it is characterised in that: including casing (1), it is provided with motor (4) on an end face of the casing (1), it is described It is provided with air inlet on the other end of casing (1), air inlet cylinder (3), the periphery of the casing (1) are provided in the air inlet It is provided on face air outlet (2), is provided with impeller in the casing (1), the impeller includes the output end with the motor (4) Substrate (5), the circumference array of transmission connection are distributed in several pieces of blades (6) of the substrate (5) medial surface, are set to the leaf Shroud (7) of the piece (6) far from the substrate (5) side, forms air-out cavity between the substrate (5) and the shroud (7), institute It states air inlet and outlet (2) to be interconnected with the air outlet (2), the blade (6) is arc-shaped, the blade (6) For arc core in the substrate (5), the proximal part of the blade (6) is inlet angle, and the distal end of the blade (6) is the angle of outlet, The line in the angle of outlet to the substrate (5) center of circle is telecentricity radius, and the telecentricity radius is fitted the straight of the fitting circle to be formed Diameter is less than the diameter of the substrate (5), and it is A that the vertical line of the tangent line of the angle of outlet and the telecentricity radius, which is formed by angle, The range of the A is 148 degree to 152 degree, and the arc radius of the blade (6) is R, and the arc length of the blade (6) is L, described The diameter of substrate (5) is D, and the distance of the arc core of the blade (6) to the substrate (5) center of circle is r, R:D=0.45~0.47, L:D=0.4~0.42, r:D=0.225~0.235.
2. a kind of blower according to claim 1, it is characterised in that: the tangent line of the inlet angle of blade described in any block (6) The distance between tangent line of the angle of outlet of blade (6) adjacent thereto is runner exit width, and the value of the runner exit width is D, L:d=2.96.
3. a kind of blower according to claim 2, it is characterised in that: A is 152 degree.
4. a kind of blower according to claim 2, it is characterised in that: R:D=0.466.
5. a kind of blower according to claim 2, it is characterised in that: L:D=0.415.
6. a kind of blower according to claim 2, it is characterised in that: r:D=0.233.
7. a kind of blower according to claim 1, it is characterised in that: the shroud (7) is rotary structure, the shroud (7) bus is arc-shaped, and the outer diameter of the shroud (7) is gradually increased along the direction of the shroud (7) to the substrate (5).
8. a kind of blower according to claim 7, it is characterised in that: the arc radius of shroud (7) bus is M, R:M =2.74.
9. a kind of blower according to claim 1, it is characterised in that: the air inlet cylinder (3) be rotary structure, it is described into The segmental arc (9) that the bus of air duct (3) includes flat segments (8), is connected with the flat segments (8) one end, the segmental arc (9) The center of circle be set to the outside of air inlet cylinder (3), the segmental arc (9) is protruded into described far from the one end of the flat segments (8) In shroud (7).
10. a kind of blower according to claim 9, it is characterised in that: the arc radius of the segmental arc (9) is N, R:N =2.74.
CN201811496621.8A 2018-12-07 2018-12-07 Fan Active CN109595197B (en)

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CN110566501A (en) * 2019-09-12 2019-12-13 佛山市南海九洲普惠风机有限公司 Forward-bending type fan blade, impeller and centrifugal fan

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CN203335470U (en) * 2013-05-23 2013-12-11 浙江大学 High-efficiency centrifugal fan without volute
CN104989669A (en) * 2015-06-17 2015-10-21 国网天津市电力公司 Method for reducing power consumption of mill exhauster by matching with duct resistance
CN107975493A (en) * 2017-12-29 2018-05-01 豫新汽车空调股份有限公司 A kind of fan for air conditioner on vehicle impeller mechanism

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CN110319054A (en) * 2019-05-30 2019-10-11 宁波方太厨具有限公司 A kind of impeller for forward centrifugal blower
CN110566501A (en) * 2019-09-12 2019-12-13 佛山市南海九洲普惠风机有限公司 Forward-bending type fan blade, impeller and centrifugal fan

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