CN2531147Y - Fan blade - Google Patents

Abstract

The utility model relates to a fan impeller, comprising a wheel disk, an axis disk, a wheel cover, and blades. The blades are fixedly arranged on the wheel disk which is fixed on the axis disk. The fan impeller is characterized in that: the blades fixedly arranged on the wheel disk are formed by long blades and short blades which are arranged in interval, the short blades form differences with the long blades in the ends near the wheel disk. The impeller of the fan of the utility model uses long blades and short blades, because the area of work is increased, the pressure is improved; as the clearance at the air inlet of the blades is increased, the aggregation of viscous impurities is reduced, which guarantees the stability of the air flow in a certain time; the fan total pressure efficiency is obviously improved, which saves the electric power resource.

Description

Draught fan impeller

Technical field

The utility model relates to the blade wheel structure of blower fan.

Background technique

The draught fan impeller structure is for to fix a wheel disc on reel, affixed blade on the wheel disc, and all blades are isometric substantially near wheel disc card length, and wheel cap and blade are affixed.The pressurization centrifugal blower impeller of conveying gas also is to adopt this structure.Blower in use for some time, pressure can reduce; The contained sticky contaminant of carrying of some gas is more, and easily assemble at the place at the blade intake grill, causes vent area to reduce, and flow reduces; The total pressure efficiency of blower fan is on the low side.These problems that occur in the blower using process all have certain relation with blade wheel structure.

Summary of the invention

Technical problem to be solved in the utility model is to improve the draught fan impeller structure, improves working pressure, ensures the stable of gas flow, improves the total pressure efficiency of blower fan.

Draught fan impeller of the present utility model, comprise wheel disc, reel, wheel cap, blade, blade is fixed on the wheel disc, wheel disc is fixed on the reel, the blade that it is characterized in that being fixed on the wheel disc is to be spaced by linear leaf, short blade to form, and short blade forms difference at an end and the linear leaf near reel.

Major technique characteristics of the present utility model are to have changed the isometric mode of structure of prior art blade, and change the spaced mode of long and short blade into.Short blade forms difference at an end and the linear leaf near reel, and the space at the intake grill place of blade is increased.Short blade is 15～95% of a linear leaf, and described linear leaf is the blade on original impeller, and its length is substantially near wheel disc card length.Blade changes long and short blade into and is spaced, and linear leaf, short blade respectively are center symmetric arrays mode on the wheel disc card, and promptly on whole circular card, the linear leaf on reel both sides or short blade are on same diameter.

The sum of linear leaf and short blade is generally 12～34, decides according to usage requirement.

It is corresponding with the leaf position of wheel disc that the utility model can increase the back auxiliary blade at the back side of wheel disc.Identical the getting final product of length of its length and linear leaf.Impeller adopts centrifugal seal, and is opposite with the pressure direction that running wheel produces by means of the back back blade so that reduce or fully elimination cause the pressure reduction revealed, prevent gas leakage.

Advantage of the present utility model:

By test, the impeller of blower fan adopts long and short blade, because the work done area increases, has improved pressure; Because the increase in gap, blade intake grill place has reduced the gathering of sticky contaminant, ensured the stable of gas flow within a certain period of time; The blower fan total pressure efficiency obviously improves, and has saved electric power energy.The utility model is particularly suitable for the pressurization centrifugal blower of conveying gas.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2, Fig. 3 are respectively A-A among Fig. 1, B-B view;

Among the figure: 1 wheel disc, 2 reels, 3 linear leafs, 4 short blades, 5 wheel caps, 6 back auxiliary blades

Embodiment

Fig. 1 is an example structure schematic representation of the present utility model.

Affixed wheel disc 1 on the reel 2 is spaced by linear leaf 3, short blade 4 on the wheel disc 1, and linear leaf, short blade respectively are center symmetric arrays mode.Linear leaf is original blade, and short blade length is 15～95% of linear leaf.Short blade forms difference at an end and the linear leaf near reel, is equivalent to original blade and begins to clip a part from the end near reel.Blade pass cross the welding or riveted fixing on wheel disc.Wheel cap 5 is affixed as known technology and blade.The affixed back auxiliary blade 6 of corresponding leaf position at the wheel disc back side, long together with linear leaf.

Claims (5)

1, draught fan impeller, comprise wheel disc, reel, wheel cap, blade, blade is fixed on the wheel disc, and wheel disc is fixed on the reel, the blade that it is characterized in that being fixed on the wheel disc is to be spaced by linear leaf, short blade to form, and short blade forms difference at an end and the linear leaf near reel.

2, impeller according to claim 1 is characterized in that short blade is 15～95% of a linear leaf.

3,, it is characterized in that linear leaf, the short blade on the wheel disc respectively is center symmetric arrays mode according to claim 1,2 or 3 described impellers.

4, impeller according to claim 1 is characterized in that the back side increase back auxiliary blade of wheel disc is corresponding with the leaf position of wheel disc.

5, impeller according to claim 4 is characterized in that the back auxiliary blade is identical with linear leaf length.

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