CN111271319A

CN111271319A - Axial flow fan blade and air conditioner

Info

Publication number: CN111271319A
Application number: CN201910012753.7A
Authority: CN
Inventors: 赵胤; 范林清
Original assignee: Aux Air Conditioning Co Ltd
Current assignee: Aux Air Conditioning Co Ltd
Priority date: 2019-01-07
Filing date: 2019-01-07
Publication date: 2020-06-12

Abstract

The invention has provided a kind of axial fan blade and air conditioner, the said axial fan blade includes the hub and sets up in the blade of the said hub week side, the said blade has blade surface, blade leading edge and blade trailing edge, the blade trailing edge of the said blade and the outer intersection point of the said hub is O, there are sunken depressed parts to the side close to the said blade leading edge on the said blade trailing edge, the sunken initial position of the said depressed part is A, the sunken ending position of the said depressed part is B, the line of the said point O and sunken ending position B of the said depressed part is straight line OB, any point on the said blade trailing edge located between O, B locates on said straight line OB or intake side of said straight line OB, the sunken initial position A of the said depressed part coincides with point O, said axial fan blade and air conditioner of the invention are small, the manufacturing cost is low; the rotation noise is low, and the air volume is high.

Description

Axial flow fan blade and air conditioner

Technical Field

The invention relates to the technical field of air conditioning equipment, in particular to an axial flow fan blade and an air conditioner.

Background

In the prior art, an axial flow fan blade generally comprises a hub and a plurality of blades arranged on the periphery of the hub, wherein each blade comprises a blade front edge, a blade surface and a blade tail edge, the blade front edge is the front edge of the blade which is in contact with the upstream side of an airflow, and the blade tail edge is the rear edge of the blade which is in contact with the downstream side of the airflow. The axial flow fan blade is driven by a motor to rotate, air flows in from the front edge of the blade, and flows out from the tail edge of the blade after the blade works to obtain pressure rise. Although the structure of the axial flow fan blade is simple, the data parameter requirements of the detailed structures of all parts of the axial flow fan blade are very high, and the operation process and the noise control of the axial flow fan blade are greatly influenced.

In the design of the axial flow fan blade, on one hand, the air flow is expected to flow along the cylindrical layer, but in the actual operation process, the air flow cannot flow along the cylindrical layer well, radial flow occurs, the larger radial flow seriously influences the acting capacity of the fan blade, influences the efficiency and increases the noise; on the other hand, it is desirable to reduce the weight and volume of the axial flow fan blade to reduce the motor load and the fan blade manufacturing cost.

At present, axial flow fan blades are generally installed in an outdoor unit of an air conditioner, and air flows directionally under the action of the blades by means of the high-speed rotation of the axial flow fan blades, so that a heat dissipation effect is generated. The axial flow fan blade is one of the important parts for air cooling and heat exchange at the outdoor side of the air conditioner, and the performance of the axial flow fan blade directly influences the performance of the whole air conditioner. On the premise of ensuring the heat exchange capacity and the energy efficiency of the whole outdoor unit, the noise generated when the outdoor unit operates is reduced, more comfortable use experience can be provided, the size of the outdoor unit is reduced, the cost can be reduced, and the market competitiveness of products is improved. Therefore, how to fully utilize the structure of the axial flow fan blade and reduce the noise, weight and volume of the axial flow fan blade has become an important issue to be solved urgently by the design and research personnel of the axial flow fan blade.

The chinese patent with application number 200710026747.4 provides an axial flow wind wheel, as shown in fig. 1, comprising three blades arranged on a hub, the trailing edge region of the blade is concave towards the air inlet direction of the leading edge of the blade, the three blades are mutually distributed with equal or unequal intervals within the range of 120 ° ± 15 ° with the central axis of rotation of the wind wheel as the center; the outer diameter of the axial flow wind wheel is defined as D2, the hub diameter is defined as D1, the blade height Rm is set to be (D2-D1)/2, the circumferential diameter of the position A where the blade tail edge recess of the blade starts is defined as D3, and (D3-D1)/2 is (0.10-0.47) Rm. The pressure distribution state of the blade is changed in advance of the blade root area in the middle of the blade tail edge blade height and the top area of the blade, so that the high-pressure airflow of the blade flows to the low-pressure surface of the blade in advance, the local pressure is increased, the boundary layer separation is reduced on the whole, the boundary layer of the blade becomes turbulent flow before reaching the blade tail edge of the blade, the vortex noise and the rotor wake are effectively reduced, and the blade has lower noise and larger air volume.

The structure optimization of axial flow wind wheel does benefit to the reduction of axial flow wind wheel noise and the reduction of weight, but along with the development of air conditioning technology, the weight and the volume of air conditioner are littleer and more, and the user has higher and higher requirement to the noise reduction, and current structure can not satisfy user's requirement, consequently, provides an axial flow fan blade that noise is low, light in weight, small, is one of the technical problem that technical staff in the field need to solve urgently.

Disclosure of Invention

In view of this, the present invention is directed to an axial flow fan blade and an air conditioner, so as to solve the technical problems of high noise, heavy weight and large volume of the conventional axial flow fan blade.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the utility model provides an axial fan blade, axial fan blade includes that wheel hub and setting are in the blade of wheel hub week side, the blade has blade surface, blade leading edge and blade trailing edge, the blade trailing edge of blade with the nodical of the wheel hub outside is O, be equipped with on the blade trailing edge to being close to the sunken depressed part in blade leading edge one side, the sunken initial position of depressed part is A, the sunken ending position of depressed part is B, point O with the line of the sunken ending position B of depressed part is sharp OB, then is located O, B arbitrary a little on the blade trailing edge all is located on the sharp OB or the air inlet side of sharp OB, the sunken initial position A and the coincidence of point O of depressed part.

Further, d3 is the diameter of the circumference where the recess start position a of the recess is located, and d4 is the diameter of the circumference where the recess end position B of the recess is located, and there are (d3-d1)/(d4-d1) ═ 0 and (d4-d1) ═ 0.75 to 1) r.

Further, if the point on the trailing edge of the blade located between O, B, which is the largest distance from the straight line OB, is C, and d5 is the diameter of the circumference of the point C, then (d5-d1)/(d2-d1) ═ 0.5-0.95) r.

Furthermore, the tail edges of the blades positioned between the O, B are in a circular arc shape, a V shape or a fold line shape.

Further, the crossing point O is a straight line OC with the point C, and the trailing edge portion of the blade located between O, C is located on the air outlet side of the straight line OC.

Further, the crossing point O is a straight line OC with the point C, and the trailing edge of the vane located between O, C is located entirely on the intake side of the straight line OC.

Further, the crossing point O is a straight line OC with the point C, and the trailing edge of the blade located between O, C coincides with the straight line OC.

An air conditioner is provided with the axial flow fan blade.

Compared with the prior art, the axial flow fan blade has the following advantages:

compared with the existing axial flow fan blade, the axial flow fan blade has the advantages that the volume is reduced, and the cost is reduced; under the same rotating speed, the rotating noise of the axial flow fan blade is reduced, and the air volume is improved.

Another objective of the present invention is to provide an air conditioner, which has the same advantages as the above axial-flow fan blades compared to the prior art, and therefore, the details are not repeated herein.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of an axial flow wind wheel in the prior art;

fig. 2 is a schematic front view of an axial-flow fan blade according to an embodiment of the present invention;

fig. 3 is a schematic front view of another axial-flow fan blade according to an embodiment of the present invention;

fig. 4 is a schematic side view of an axial-flow fan blade according to an embodiment of the present invention.

Description of reference numerals:

1-blade, 101-blade leading edge, 102-blade surface, 103-blade trailing edge, 104-depression and 2-hub.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example 1

As shown in fig. 2 to 4, the axial flow fan blade includes a hub 2 and a blade 1 disposed on the peripheral side of the hub 2.

Preferably, 3 blades 1 are arranged on the peripheral side of the hub 2, and 3 blades 1 have the same shape. The rotation central axis of the axial flow fan blade is defined as P, and 3 blades 1 are uniformly distributed within the range of the relative angle of 120 degrees +/-15 degrees by taking the rotation central axis P of the axial flow fan blade as the center.

Further, the vane 1 has a vane surface 102, a vane leading edge 101 and a vane trailing edge 103, and the airflow flows into the vane passage from the vane leading edge 101 and flows out from the vane trailing edge 103.

Further, the diameter of the hub 2 is defined as d1, the outer diameter of the axial-flow fan blade is defined as d2, and the height of the blade 1 is defined as r, so that r is (d2-d 1)/2.

Further, a starting position of the blade 1 is defined, that is, an intersection point of the blade trailing edge 103 of the blade 1 and the outer side of the hub 2 is O, a recessed portion 104 recessed toward a side close to the blade leading edge 101 is provided on the blade trailing edge 103, a recessed starting position of the recessed portion 104 is defined as a, a recessed ending position of the recessed portion 104 is defined as B, the recessed starting position a of the recessed portion 104 is located at a side close to the hub 2, and the recessed ending position B of the recessed portion 104 is located at a side far from the hub 2. The line of point O with the sunken final position B of depressed part 104 is straight line OB, and the air current is followed blade front edge 101 flows in the blade passageway, via behind the blade surface 102, follow blade trailing edge 103 flows out, in the both sides of straight line OB, the one side that the air current flows in is the air inlet side, the one side that the air current flows out is the air-out side. The blade trailing edge 103 is a continuous curve, any point on the blade trailing edge between O, B is located on the straight line OB or the air inlet side of the straight line OB, and the recess initial position a of the recess coincides with the point O. In this embodiment, the position of the recessed portion 104 of the axial flow fan blade is closer to the hub 2, and the recessed starting position a of the recessed portion 104 coincides with the point O, so that compared with the existing axial flow fan blade, the axial flow fan blade of this embodiment has lower noise and larger air volume.

Further, when d3 is defined as the diameter of the circumference where the recess start position a of the recess 104 is located, and d4 is defined as the diameter of the circumference where the recess end position B of the recess 104 is located, there are (d3-d1)/(d4-d1) ═ 0 and (d4-d1) ═ 0.75 to 1) r. Compared with the existing axial flow fan blade, the axial flow fan blade has the advantages that d3 and d4 are reduced, air volume is improved, noise is reduced, and weight and volume are reduced compared with the existing axial flow fan blade.

Further, if a point on the trailing edge 103 of the blade located between O, B and having the largest distance from the straight line OB is C, and d5 is defined as the diameter of the circumference of the point C, then (d5-d1)/(d2-d1) ═ 0.5-0.95) r; o, B, the curve of the trailing edge 103 of the blade is circular, V-shaped or dog-leg shaped. When the position of the point C meets the requirements, the air volume of the axial flow fan blade can be further improved, and the weight and the volume can be further reduced.

Further, if the passing point O and the point C are made as a straight line OC, the trailing edge 103 between O, C may be partially located on the air outlet side of the straight line OC; it may also be located entirely on the intake side of the straight line OC; but also with said straight line OC. When the axial-flow fan blade works, airflow flows into the blade channel from the blade front edge 101, flows out from the blade tail edge 103 after passing through the blade surface 102, and in two sides of the straight line OC, one side where the airflow flows in is an air inlet side, and one side where the airflow flows out is an air outlet side.

Compared with the existing axial flow fan blade, on one hand, the axial flow fan blade has a novel structure and a more attractive appearance; on the other hand, the axial flow fan blade has the advantages that the volume is reduced, and the cost is reduced; more importantly, under the same rotating speed, the rotating noise of the axial flow fan blade is reduced, and the air volume is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The axial flow fan blade is characterized by comprising a hub (2) and blades (1) arranged on the peripheral side of the hub (2), the blade (1) has a blade surface (102), a blade leading edge (101) and a blade trailing edge (103), the intersection point of the blade tail edge (103) of the blade (1) and the outer side of the hub (2) is O, the blade tail edge (103) is provided with a sunken part (104) which is sunken towards one side close to the blade front edge (101), the initial position of the recess (104) is A, the end position of the recess (104) is B, a line connecting the point O and a recess end position B of the recess portion (104) is a straight line OB, any point on the trailing edge (103) of the blade between O, B is located on the straight line OB or the air intake side of the straight line OB, and the depression start position a of the depression section (104) coincides with the point O.

2. The axial-flow fan blade of claim 1, wherein d3 is the diameter of the circumference where the recess start position a of the recess (104) is located, and d4 is the diameter of the circumference where the recess end position B of the recess (104) is located, and then (d3-d1)/(d4-d1) ═ 0, (d4-d1) ═ 0.75-1) r.

3. The axial-flow fan blade of claim 1, wherein a point on the trailing edge (103) of the blade located between O, B and having the largest distance from the straight line OB is C, and d5 is the diameter of the circumference of the point C, so that (d5-d1)/(d2-d1) is (0.5-0.95) r.

4. The axial-flow fan blade according to claim 1, wherein the trailing edge (103) of the blade located between O, B is in the shape of a circular arc, a V-shape, or a broken line.

5. The axial flow fan blade according to claim 3, wherein the passing point O and the point C form a straight line OC, and the part of the trailing edge (103) between O, C is positioned on the air outlet side of the straight line OC.

6. The axial flow fan blade according to claim 3, wherein the crossing point O is a straight line OC with the point C, and the trailing edge (103) of the blade between O, C is completely located on the air inlet side of the straight line OC.

7. The axial-flow fan blade according to claim 3, wherein the passing point O and the point C form a straight line OC, and the trailing edge (103) of the blade between O, C is coincident with the straight line OC.

8. An air conditioner, characterized in that, the air conditioner has the axial flow fan blade of any one of the above claims 1 to 7.