CN2483544Y

CN2483544Y - Axial flow fan blade of thin and hollow wall

Info

Publication number: CN2483544Y
Application number: CN 01245781
Authority: CN
Inventors: 任世瑶; 任勇; 方建法; 尚晓南; 朱伟萍
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2001-06-07
Filing date: 2001-06-07
Publication date: 2002-03-27
Anticipated expiration: 2011-06-07

Abstract

A thin-walled hollow wing type axial fan blade with same elementary blade type, belongs to the fluid machinery technology field, which adopts a same basic blade type from the blade top to the blade root of the fan blade, the section of the fan blade is the thin-walled hollow wing type. The wing type tail is connected with a certain width solid plate, according to the fan with different diameter, the solid plate is cut by the aerodynamic principle, and a partial twisting formation is made on the corresponding part to attain different blade angle value on the different radius of blade, so the blade type character can be changed, the optimal forming can be achieved, the higher operating efficiency can be ensured.

Description

The thin-walled hollow wing blade axial-flow fan blade that each primitive blade profile is identical

The utility model relates to a kind of axial-flow fan blade, particularly a kind of each primitive all adopts the thin-walled hollow wing blades of identical blade profile, belongs to the fluid machinery technical field.

In prior art, obtain better aerodynamic characteristics and acoustical behavior in order to make axial-flow fan blade, the blade profile in each cross section of blade is (referring to that blade chord length, sagitta, blade camber line and Ye Jiao are inequality) inequality, the blower fan of different performance parameter all needs independent molding jig in principle, manufacturing expense is increased, limited promotion efficiency.

The beginning of the nineties, Italy blower fan manufacturer adopts the extrusion modling blade, can be by the blade of blower fan diameter intercepting respective length, but adopt the structure that intercepts the trailing edge flat board and press the fluid mechanics principle brake forming, angle of fan leaves pushes up blade root from leaf and is same leaf angle, operational efficiency is low, the power consumption height.

The utility model purpose is for deficiency that overcomes prior art and defective, design the blade of a kind of each primitive blade profile identical (cross section is the thin-walled hollow wing blade), fan blade to the different performance parameter, need not independent molding, can satisfy parameter request equally, and have higher aeroperformance and acoustical behavior, and can realize energy-conservation to greatest extent and noise reduction, reduce manufacture cost greatly.

For achieving the above object, the technical solution of the utility model is that the leaf from fan blade pushes up blade root portion and all adopts same basic blade profile, its section is the thin-walled hollow wing blade, be connected with the solid flat board of certain width at the wing blade afterbody, blower fan to different-diameter can rationally cut solid slab, and does the local buckling shaping, thereby the different blade angle values that obtain blade different radii place change the blade profile feature, realize optimizing moulding, guarantee that blower fan has higher running efficiency.

The utlity model has remarkable economic efficiency, the fan blade of different performance parameter be need not independent molding, and have higher aeroperformance and acoustical behavior, can realize energy-conservation to greatest extent and noise reduction, reduce manufacture cost greatly.

Below in conjunction with accompanying drawing concrete enforcement of the present utility model is further described:

Fig. 1 is the utility model blade shape and scheme of installation

Fig. 2 a is a vane foil schematic top plan view wide outside and narrow inside

Fig. 2 b is a leaf curling shape schematic representation wide outside and narrow inside

Fig. 3 a is outer narrow inner width vane foil schematic top plan view

Fig. 3 b is outer narrow inner width leaf curling shape schematic representation

Fig. 4 a is inner width, outer wide, middle narrow blades schematic top plan view

Fig. 4 b is inner width, outer wide, middle narrow blades distorted shape schematic representation

As shown in Figure 1, blade is made of last cambered surface 1 and lower camber side 2, blade 3 all adopts same basic blade profile to blade root 4 from leaf top, its section is the thin-walled hollow wing blade, at the wing blade afterbody, be connected with certain width solid dull and stereotyped 7, leaf top sealing plate 8 and blade root shrouding 9 are sealed the hollow blade two ends, centre of form place at blade root shrouding 9 has circular hole 10, steel pipe 11 1 ends are in circular hole 10 penetrates the blade middle cavity, cambered surface 1 and lower camber side 2 are fixed on the steel pipe 11 on the blade, with U type screw steel pipe 11 the other ends are fixed on the wheel hub 12.According to the requirement of different-diameter blower fan, solid dull and stereotyped intercepting different length can be made wide outside and narrow inside (see Fig. 2 a) or outer narrow inner width (see a) wing blades of Fig. 3, and according to fluid mechanics principle, when blade was blade profile wide outside and narrow inside, leaf pushed up the solid dull and stereotyped 7 contrary airflow direction distortions of 3 places, makes leaf push up leaf angle, 3 place and reduces, (seeing Fig. 2 b), outside blade is narrow in during wide blade profile, the solid dull and stereotyped 7 downstream directions distortion in blade root 4 places makes leaf angle, blade root 4 place increase (seeing Fig. 3 b).But blade also the aerodynamically principle with solid dull and stereotyped 7 be cut into circular-arc make blade be inner width, outer wide in narrow type, (see Fig. 4 a) and leaf push up the contrary airflow directions distortion in 3 places solid dull and stereotyped 7, the solid dull and stereotyped 7 downstream directions distortion in blade root 4 places, making leaf push up leaf angle, 3 place reduces, leaf angle, blade root 4 place increases, (seeing Fig. 4 b).

Claims

1, the thin-walled hollow wing blade axial-flow fan blade that a kind of each primitive blade profile is identical, form by last cambered surface (1) and lower camber side (2), it is characterized in that blade is same blade profile from leaf top (3) to blade root (4), its section is the thin-walled hollow wing blade, be connected with the solid flat board of certain width (7) at the wing blade afterbody, cutting solid flat board (7) can make blade outer wide, interior narrow wing blade or narrow outward, the inner width wing blade, when blade is wing blade wide outside and narrow inside, the contrary airflow direction distortion of solid flat board (7) is located on leaf top (3), blade be outer narrow in during wide blade profile, blade root (4) is located the distortion of solid flat board (7) downstream direction, leaf top sealing plate (8) and blade root shrouding (9) are sealed the hollow blade two ends, have circular hole (10) at the centre of form place of blade root shrouding (9), one end of steel pipe (11) penetrates in the blade middle cavity through circular hole (10), and cambered surface on the blade (1) and lower camber side (2) are fixed on the steel pipe (11).

2, by the identical thin-walled hollow wing blade axial-flow fan blade of described each the primitive blade profile of claim 1, its feature also is, solid flat board (7) can cut into circular-arc, blade be inner width, outer wide, in narrow type, and the contrary airflow direction distortion of solid flat board (7) is located on leaf top (3), and blade root (4) is located the distortion of solid flat board (7) downstream direction.