CN101749272B

CN101749272B - Fan impeller

Info

Publication number: CN101749272B
Application number: CN2008102074697A
Authority: CN
Inventors: 张敏; 施密特·乌韦
Original assignee: CHANGZHOU XIANGXING ELECTRIC MACHINE Co Ltd
Current assignee: Changzhou Xiangming Electromotor Co., Ltd.
Priority date: 2008-12-19
Filing date: 2008-12-19
Publication date: 2011-09-28
Anticipated expiration: 2028-12-19
Also published as: WO2010069126A1; EP2378131A4; CN101749272A; EP2378131B1; EP2378131A1

Abstract

The invention provides a fan impeller. The fan impeller is provided with a plurality of vanes mounted between upper and lower end plates of the impeller, wherein the vane is provided with at least one indent pressing rib along the transverse direction thereof, and one end of the pressing rib close to the tail end of the vane is provided with a through hole. Because of the adoption of the technical scheme, when the fan impeller revolves, a part of air on the front surface of the vane can flow to the rear surface of the vane from the through hole at the tail end of the pressing rib along the direction of the indent pressing rib so as to achieve the effect of balancing the pressure of the front and rear surfaces of the vanes, further reduce the air resistance, increase the ventilation quantity and improve the work efficiency.

Description

A kind of draught fan impeller

Technical field

The present invention relates to a kind of impeller, relate in particular to a kind of draught fan impeller.

Background technique

Blower fan is a kind of device that wind regime power can be provided, be widely used in the various occasions, particularly in fields such as heating ventilator system, purification filtering system, wind-force system of kinetic energy, play very important and irreplaceable effect, wherein centrifugal fan is widely used in fields such as HVAC, new wind, cleaning because of the manufacturing process of its distinctive import/exhaust structural principle and maturation, for example: in the systems such as FFU, FCU.

Traditional fan design theory and product structure, particularly to some special applications, as: environment such as medical treatment, communication, environmental protection, medicine food, aviation electronics can not satisfy its demand, therefore, people have had the standard of more increasing to requirements such as efficient, the energy-saving and environmental protection of blower fan, low noise, safety.

As everyone knows, when the operation centrifugal fan, pressure and the turnover rate that is born all is different because blade laterally and directly makes progress, cause between each blade and can produce irregular air flows and air collides mutually, can produce noise inevitably, especially along with rotation speed of fan is more and more higher increasing with diameter, noise is also just increasing.

As shown in Figure 1, a kind of centrifugal fan that uses backward curved vane, air flows situation in the wherein a certain blade groove, wherein, air flows density on blade 2 front surfaces 26 makes to produce the air flows displacement at blade end 25 near 27 places, rear surface that the air-flow direction when blower fan runs well has been upset in this air flows displacement apparently higher than its rear surface 27, not only produce noise, also caused terminal 25 ventilation to be significantly less than the ventilation at middle part 24.

Fig. 2 then illustrates a kind of Scroll-tupe and refluxes, because draught fan impeller turns clockwise, air 3 is 23 inflows from blade top, to before this

blade

26,27 surfaces, back produce air pressure respectively, front surface pressure increases gradually from blade top to end, rear surface pressure then reduces gradually from blade top to end on the contrary, cause forming a low pressure area 28 near 27 places, blade rear surface at blade end 25, for the balance atmospheric pressure, ambient air can pass back into this low pressure area 28 from blade end 25, thereby formed Scroll-tupe at blade end 25 near 27 places, blade rear surface and refluxed 31, the generation of this backflow 31 not only can cause bigger resistance of air, to consume more multipotency, also can be reduced in the ventilation of blade end 25, influence the efficient of blower fan running, and the mutual collision of return air, or all can produce more noise with the collision of blade.

In the prior art, we are provided with some evagination beadings on the blade of draught fan impeller, or optimize the tortuosity of blade, noise in the time of can both reducing the blower fan running to a certain extent, but DeGrain, and can't avoid blower fan when running, the reduction of working efficiency.

Summary of the invention

In order to address the above problem, when blower fan turns round, reach the reduction noise, the effect of raising the efficiency the invention provides a kind of draught fan impeller, described draught fan impeller has several and is installed in blade between the upper and lower end plate of impeller, wherein, described blade laterally is provided with at least one indent beading along it, and described indent beading is provided with through hole at the end place near blade end, and described through hole is positioned at 1/5～1/3 place from the blade end length of blade, for example 1/5 place, 1/4 place, 1/3 place etc.

In the present invention, described blade adopts any one form in backward curved vane, back prismatic blade, footpath prismatic blade, forward curve blade and the preceding prismatic blade.

In the present invention, the cross section of described indent beading is semicircle, rectangle or other common geometric figures.

In addition, in the present invention, the degree of depth of the quantity of described beading and/or the width of beading and/or beading and/or the size of through hole increase with the increase of blade height.

The present invention adopts technique scheme, when draught fan impeller turns round, air flows into from blade top, before this blade, the rear surface produces air pressure respectively, front surface pressure increases gradually from blade top to end, rear surface pressure then reduces gradually from blade top to end on the contrary, cause forming a low pressure area in this tail end, blade rear surface, owing on blade, be provided with the indent beading, and the end of beading has through hole, makes the part air of blade front surface to flow to the low pressure area of blade rear surface from the through hole of beading end along the direction of indent beading, before reaching balance blade, the effect of rear surface pressure, and then avoided the generation of air flows displacement, and not only reduce the noise that air collides generation mutually, reduce resistance of air, also increase ventilation, improved working efficiency.

Description of drawings

Fig. 1 is air flow schematic representation in the existing radial fan blade groove;

Fig. 2 is Scroll-tupe backflow schematic representation in the existing radial fan blade groove;

Fig. 3 is the blade structure figure of one embodiment of the present invention;

Fig. 4 is the blade plan view and the partial view of one embodiment of the present invention;

Fig. 5 is the blade wheel structure figure of one embodiment of the present invention;

Fig. 6 flows to schematic representation for the impeller air of one embodiment of the present invention.

1～draught fan impeller; 2～blade; 3～air; 4～upper head plate; 5～lower end sheet;

21～indent beading; 22～through hole; 23～blade top; 24～blade middle part;

25～blade end; 26～blade front surface; 27～blade rear surface; 28～low pressure area;

29～inside corners; 20～joint; 31～Scroll-tupe refluxes; 32～supplemental air flow.

Embodiment

Below in conjunction with the drawings and specific embodiments, to the more detailed description of the present invention.

Please consult Fig. 3, Fig. 4 and Fig. 5 simultaneously, one embodiment of the present invention provides a kind of draught fan impeller 1 that is used for blower fan filtering unit (FFU), this draught fan impeller 1 is made up of upper head plate 4, lower end sheet 5 and seven backward curved vanes 2, backward curved vane 2 is installed between the upper and lower end plate, and fixes with upper and lower end plate respectively by joint 20.Wherein, it is semicircular indent beading 21 that backward curved vane 2 laterally is provided with three cross sections along it, every beading all is provided with a through hole 22 at the end place near blade end 25, and through hole 22 is positioned at from 1/5 place of blade end 25 length of blade, and backward curved vane 2 also has an inside corners 29 at its top 23.

In the preferred embodiment, the upper head plate 4 of draught fan impeller 1, lower end sheet 5 and blade 2 can be made of materials such as aluminium sheet, steel (iron) plate or plastic article.The model specification of selecting blower fan according to the service condition or the parameter of blower fan, comprise key elements such as form and size, after upper head plate 4, lower end sheet 5 and the blade 2 independent moulding, on special tool,, blade 2 and upper head plate 4 and lower end sheet 5 are assembled into finished product draught fan impeller 1 by riveted way.

By above-mentioned setting, as shown in Figure 6, when 1 running of draught fan impeller that the preferred embodiment provided, air 3 is 23 inflows from blade top, front surface 26 and rear surface 27 to blade produce air pressure respectively, the pressure of front surface 26 increases to terminal 25 gradually from blade top 23, the pressure of rear surface 27 then reduces to terminal 25 gradually from blade top 23 on the contrary, cause that 27 terminal 25 places form a low pressure area 28 in this blade rear surface, owing on blade 2, be provided with indent beading 21, and the end of beading 21 is provided with through hole 22, make blade front surface 26 the part air as a supplement air-flow 32 along the direction of indent beading 21, flow to the low pressure area 28 of blade rear surface 27 from the through hole 22 of beading end, reach balance blade before, the effect of rear surface pressure, and then avoided the generation of air flows displacement, not only reduce the noise that air collides generation mutually, reduce resistance of air, also increased ventilation, improved working efficiency.

In other specific embodiments, blade also can be in back prismatic blade, footpath prismatic blade, forward curve blade and the preceding prismatic blade any one, being connected also between blade and the upper and lower end plate can be by crimping, welding, mode such as bonding, and the cross section of indent beading also can be other common geometric figures, such as, rectangle, triangle, circle etc.

In other specific embodiments, the degree of depth of the quantity of described beading and/or the width of beading and/or beading and/or the size of through hole increase with the increase of blade height.

Embodiments of the invention have preferable implementation, and be not that the present invention is done any type of restriction, any person skilled in art of being familiar with may utilize the technology contents change of above-mentioned announcement or be modified to the effective embodiment who is equal to, in every case the content that does not break away from technical solution of the present invention,, all still belong in the scope of technical solution of the present invention any modification or equivalent variations and modification that above embodiment did according to technical spirit of the present invention.

Claims

1. draught fan impeller has several and is installed in blade between the upper and lower end plate of impeller, it is characterized in that described blade laterally is provided with at least one indent beading along it, and described indent beading is provided with through hole at the end place near blade end.

2. draught fan impeller as claimed in claim 1 is characterized in that, described through hole is positioned at 1/5～1/3 place from the blade end length of blade.

3. draught fan impeller as claimed in claim 2 is characterized in that, described through hole is positioned at 1/4～1/3 place from the blade end length of blade.

4. draught fan impeller as claimed in claim 3 is characterized in that, the cross section of described indent beading is semicircle, rectangle, triangle or circle.

5. draught fan impeller as claimed in claim 4 is characterized in that the top of described blade has inside corners.

6. as the described draught fan impeller of above-mentioned each claim, it is characterized in that, described blade be in backward curved vane, back prismatic blade, footpath prismatic blade, forward curve blade or the preceding prismatic blade any one.