CN2320828Y

CN2320828Y - Blade for axial-flow fan

Info

Publication number: CN2320828Y
Application number: CN 98235337
Authority: CN
Inventors: 娄伟
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-02-27
Filing date: 1998-02-27
Publication date: 1999-05-26
Anticipated expiration: 2008-02-27

Abstract

The utility model relates to an impeller which is suitable for axial flow fans. The utility model comprises a hub and blades which are evenly distributed on the periphery of the hub. The utility model is characterized in that the impeller is composed of at least one closed hub ring and the blades, wherein the diameter of the hub ring is bigger than that of the hub, the blades are evenly distributed between the hub and the hub ring, and the hub, the hub ring and the blades form a rigid structure. The utility model has the advantages that the utility model can effectively eliminate gaps between the blades and a machine casing, can thoroughly collect centrifugal force generated by the axial flow of airflow during the rotation of the blades and increases the total pressure rise of an axial flow fan; besides, the blades are correspondingly and evenly distributed, and both ends of the blades are stressed evenly; the utility model has large air pressure, low noise and high efficiency under the same condition.

Description

Be applicable to the impeller of axial fan

The utility model relates to a kind of blower fan impeller, relates to a kind of flabellum that is applicable to axial fan specifically.

Mostly the impeller of traditional axial fan (no matter be engineering with high pressure, big flow blower fan, still home-use ventilating fan) is to be made up of wheel hub and the blade that is distributed on the wheel hub, and difference only is the change of blade shape, angle.Facts have proved, though the impeller of said structure has its different advantage, but also ubiquity following deficiency: 1. owing to have certain clearance between blade edge and the casing, and flow, pressure that the existence in gap certainly will have influence on blower fan with and working efficiency; 2. when blade rotation, air-flow radially flows towards blade end, makes centrifugal action strengthen, and this pressure that is produced that flows loses because of collecting for axial-flow blower.For reducing this loss, be mostly in the change of blade shape, to make an issue of at present, this also just appears at the total head liter of the total head liter of other condition axial-flow blower when identical less than centrifugal blower; 3. the blade density of axial-flow blower is inhomogeneous especially diametrically, and is intensive at the wheel hub blade, and peripheral velocity is minimum, can only be with strengthening width of blade, and the way that increases the angle of attack is compensated, but can not increase too much, otherwise can cause gas separation.It is then rare excessively by blade occurring to be positioned at blade end, operational condition is abominable especially again herein, on the one hand blade is equivalent to the end of cantilever structure herein, its rigidity is minimum, peripheral velocity is the highest again herein on the other hand, and the power of bearing is also maximum, for addressing this problem, mostly be that under existence conditions employing reduces width of blade or the minimizing angle of attack is offset, imitate thing but can reduce blower fan so again; 4. because the axial-flow blower voltage rise is low, have to adopt the method that increases rotation speed of fan in order to address this problem, but this also just directly causes the increase of fan noise.

The purpose of this utility model provides a kind of scientific and reasonable for structure with regard to being to overcome above-mentioned deficiency of the prior art, can effectively eliminate the gap of depositing between blade and casing, and the centrifugal force that air-flow radially flows and produced can fully collect blade rotation the time, increase the impeller that is applicable to axial fan that the axial fan total head rises.In addition, the purpose of this utility model also is realizing realizing on the last purpose basis that blade relatively evenly distributes, stressed big, the inefficient high impeller that is applicable to axial fan of noise of blast under identical conditions uniformly in its two ends.

The purpose of this utility model can adopt following measure to realize:

Impeller of the present utility model comprises wheel hub, and the blade that is distributed in the wheel hub periphery, described impeller by at least one diameter greater than the closed wheel rim of wheel hub and be distributed in wheel hub and wheel rim between blade form, and be a rigid structure between wheel hub, wheel rim and the blade three.

The inside and outside wheel rim that impeller in the utility model can not waited by two diameters and be distributed in wheel hub and inner rim between, the blade between inner rim and the outer rim forms; Impeller also can adopt according to actual needs by three diameters do not wait interior, in, outer rim and be distributed in wheel hub and inner rim between, blade between inner rim and the middle wheel rim, between middle wheel rim and the outer rim forms.

The utility model removes to have can effectively eliminate the gap of depositing between blade and casing, and the centrifugal force that air-flow radially flows and produced can fully collect blade rotation the time, outside the advantage that the total head of increase axial fan rises, also having blade relatively evenly distributes, its two ends are stressed evenly, big, the inefficient high advantage of noise of blast under identical conditions.

The drawing of accompanying drawing is described as follows:

Fig. 1 cuts open figure for master of the present utility model.

Fig. 2 is that the A of Fig. 1 is to view.

Fig. 3 is that the B of Fig. 1 is to view.

The utility model is done with detailed description below with reference to embodiment's (accompanying drawing):

Impeller of the present utility model comprises wheel hub (1), two closed inside and outside wheel rims (3) (5) that diameter does not wait, and be distributed between wheel hub (1) and the inner rim (3), the blade (2) (4) between inner rim (3) and the outer rim (5) forms; And between hub (1), wheel rim (3) (5) and the blade (2) (4) three is rigid structure; The root and the wheel hub that promptly are arranged in the blade of inner rim are integral structure, and its end is fixed together with inner rim, and the root and the inner rim that are arranged in the blade of inside and outside wheel rim are integral structure, and its end is fixed together with outer rim.

The quantity of wheel rim can design according to actual demand such as blower fan size, exhaust air rate sizes in the utility model, can be a wheel rim, also can be that a plurality of wheel rims and the blade that is distributed between per two adjacent wheel rims are formed.

From accompanying drawing of the present utility model as can be seen since blade edge and closed wheel rim be fixed together, this just overcome effectively flow, pressure because of the blower fan of the existence generation in gap between blade end and the casing reduce with and the reduction deficiency of working efficiency; In addition, the design of an above wheel rim and the outer ring number of blade are more than the enforcement of the structure characteristic of the inner ring number of blade, fundamentally having solved in the prior art because of blade density is inhomogeneous diametrically (is that the wheel hub blade is intensive, but peripheral velocity is minimum, it is then rare excessively by blade occurring to be positioned at blade end, rigidity is minimum, and operating conditions is the most abominable) deficiency.

Claims

1, a kind of impeller that is applicable to axial fan, it comprises hub (1), and the blade (2) that is distributed in the wheel hub periphery, it is characterized in that: described impeller by at least one diameter greater than the closed wheel rim (3) of wheel hub (1) and be distributed in wheel hub (1) and wheel rim (3) between blade (2) form, and be a rigid structure between wheel hub (1), wheel rim (3) and the blade (1) three.

2, the impeller that is applicable to axial fan according to claim 1 is characterized in that: the inside and outside wheel rim (3) (5) that impeller is not waited by two diameters and be distributed in wheel hub (1) and inner rim (3) between, the blade (2) (4) between inner rim (3) and the outer rim (5) forms.