CN211692949U - Axial flow fan blade and fan with same - Google Patents

Abstract

The utility model relates to an axial compressor fan blade and have fan of this fan blade, including wheel hub and a plurality of blades that encircle wheel hub and set up, its blade back pressure face is provided with a plurality of heavy grooves from the blade trailing edge to the blade leading edge, heavy groove opening direction is the same with wheel hub axial direction, the groove depth of heavy groove is from the blade inner edge to the blade outer fringe by the depth-to-depth, and it is the same to make the heavy groove tank bottom each locate the thickness that receives the pressure face. The pressure surface of the back of the fan blade is provided with a plurality of sinking grooves, so that on one hand, the structural strength is not reduced too much, and the damage to the structure of the fan blade is prevented, and the requirements on the performance, the service life and the like of the fan blade can be still met; on the other hand, the weight of the fan blades is reduced, the power consumed by the motor when the fan blades rotate is reduced, the working efficiency of the fan is improved, the energy consumption ratio of the fan is improved, materials consumed by the fan blades are reduced, and raw materials are saved.

Description

Axial flow fan blade and fan with same

Technical Field

The utility model relates to an axial fan field especially relates to axial fan blade.

Background

The axial flow fan blade has wide application in daily life, and the axial flow refers to airflow flowing in the same direction as the axis of the fan blade. The common axial flow fan blade mainly comprises a hub and a plurality of blades arranged on the peripheral side of the hub, although the structure is simple, the data parameter requirements of the detailed structures of all positions of the axial flow fan blade are very high, and the axial flow fan blade has great influence on the operation and noise control of the axial flow fan blade.

As shown in fig. 1, the chinese invention with an authorized bulletin number CN 102330708A discloses an axial flow fan blade, which includes a lamellar blade body; the method is characterized in that: one side of the fan blade body is provided with a groove, and a bulge is formed on the back side of the groove; two or more mounting holes are arranged on the fan blade body. According to the fan blade, the grooves and the bulges which play a reinforcing role are arranged on the fan blade and used as the reinforcing ribs, so that the strength and the rigidity of the fan blade can be obviously improved, the thickness of the fan blade can be reduced from about 2mm to about 0.8 mm, but the air supply amount can be reduced to a certain extent.

Disclosure of Invention

In order to solve the above problem, an object of the present invention is to provide an axial flow fan blade capable of reducing the weight of the fan blade and the structural strength and the air output per unit time without reducing.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the axial flow fan blade comprises a hub and a plurality of blades arranged around the hub, wherein a plurality of sinking grooves are formed in the back pressure surface of each blade from the rear edge of each blade to the front edge of each blade, the opening direction of each sinking groove is the same as the axial direction of the hub, the depth of each sinking groove is changed from the inner edge of each blade to the outer edge of each blade from deep to shallow, and the thickness from each part of the bottom of each sinking groove to a pressure surface is the same. The plurality of the sinking grooves are formed in the pressure surface of the back of the blade along the airflow direction, so that the weight of the blade is reduced, the structural strength is basically unchanged, and the structural damage of the blade is prevented; the reason that the sink groove direction is the same as the hub direction is that the fan blade is integrally molded, and the demolding direction of the sink groove needs to be consistent with the demolding direction of the hub to ensure successful demolding after the injection molding is finished. The axial flow fan blades are plastic parts, and need to be cooled after injection molding, certain shrinkage can occur during cooling, the wall thickness is uneven, the amplitude of local shrinkage is larger than that of local shrinkage and smaller, further local collapse can be caused, the air flow condition of a pressure-bearing surface is influenced, the wall thickness of the area needs to be consistent to avoid the condition, and meanwhile, the inner edges of the axial flow fan blades are thick, the outer edges of the axial flow fan blades are shallow, and the depth of the grooves of the sunken grooves is changed from the inner edges of the axial flow fan blades to the outer edges of the axial flow fan blades.

The distance between the two groove walls of the sinking groove is changed from short to long from the inner edge of the blade to the outer edge of the blade. The blade of the axial flow fan blade is in a shape with a narrower inner side and a wider outer side, and in order to reduce the weight as much as possible and simultaneously ensure that the reinforcing rib part between two adjacent sinking grooves is as uniform as possible, the efficiency of the fan is improved conveniently and the demoulding of the reinforcing rib is facilitated.

The diameter of an axial projection line of the outer edge of the fan blade is D1, and the diameter of the axial projection line of the outer edge of the hub is D2= D1 (20% -40%); the axial projections of the outer end edges of the multiple sinking grooves are on the same circle, the diameter of the circle is D1, D1= D1 (80% -95%); the axial projection of the outer end edges of the multiple sinking grooves is on the same circle, the diameter of the circle is D2, D2= D2 (110% -130%).

The pressure-bearing surface and/or the back pressure surface of the front edge of the blade are/is provided with reinforcing strips along the direction of the front edge. In the rotating process of the axial flow fan blade, the front edge part plays a role in dividing high-speed airflow into two parts, on one hand, the front edge of the blade is an inwards concave arc line, and the more outward the pressure bearing is, the more wind pressure can be borne by the front edge of the blade, particularly the part close to the outer edge, the more wind pressure is easy to deform, the part of the front edge connected with the hub is easy to break due to the rotation of the blade, the pressure bearing surface is arranged to fully cover the whole blade, and is simultaneously connected with the hub, so that the integral strength of the front edge of the blade is enhanced.

The back pressure surface at the joint of the front edge of the blade and the hub is provided with a plurality of reinforcing ribs protruding in the axial direction, and the heights of the upper end surfaces of the plurality of reinforcing ribs are sequentially reduced from the front edge of the blade to the rear edge of the blade. In the rotating process of the axial flow fan blade, the joint of the front edge of the fan blade and the hub is most easily broken, so that a plurality of reinforcing ribs are arranged; the reinforcing ribs are arranged on the pressed surface because the pressure-bearing surface has relatively large influence on the air flow; meanwhile, the protruding direction of the reinforcing ribs is the same as the direction of the hub, so that demolding after injection molding is facilitated. In the rotation process of the axial flow fan blade, the airflow is divided into two parts when meeting the front edge of the blade, the airflow divided to the back pressure surface flows along the surface of the back pressure surface due to the small air pressure of the pressure surface, and the heights of the upper end surfaces of the reinforcing ribs are sequentially reduced along the airflow direction to match the flow direction of the airflow.

A fan comprises the axial flow fan blade.

By adopting the technical scheme, the fan blade back pressure surface is provided with the plurality of the sinking grooves, so that the structural strength is not weakened too much, the damage to the blade structure is prevented, and the requirements on the performance, the service life and the like of the fan blade can be still met; on the other hand, the weight of the fan blades is reduced, the power of the motor consumed by the rotation of the fan blades is reduced, the working efficiency of the fan is improved, the energy consumption ratio of the fan is improved, materials consumed by the fan blades are reduced, and raw materials are saved.

Drawings

Fig. 1 is a prior art explanatory diagram.

Fig. 2 is a schematic view of the back pressure surface of the present invention.

Fig. 3 is a schematic view of the pressure surface of the present invention.

Fig. 4 is a schematic view of the protrusion of the present invention.

Fig. 5 is a schematic size diagram of the present invention.

Fig. 6 is a schematic cross-sectional view of the blade of the present invention.

Fig. 7 is an experimental data table of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1: as shown in fig. 2 and 4, an axial flow fan blade comprises a hub 1 and a plurality of blades 2 arranged around the hub, wherein a plurality of groove structures 4 recessed in the direction perpendicular to the trailing edge are arranged on the trailing edge 3 of each blade along the direction of the trailing edge, a protrusion 5 is formed between every two adjacent groove structures, the axial projection line of each protrusion edge 6 is an arc, and the circle centers of the axial projection lines of the protrusion edges are on the same circumference line.

Because the angular velocity is the same when the blade rotates, the radial linear velocity along the axial flow fan blade is increasingly greater, and the radial exhaust air volume along the axial flow fan blade is gradually increased, therefore, the more the air volume near the outer edge of the blade is, the more the generated vortex is, the greater the vortex strength is, the more the air volume near the hub is, the less the generated vortex is, and the smaller the vortex strength is, so that the groove structure does not need to be arranged on the inner side, and in view of ensuring the structural strength of the inner side of the blade, the bearing force required by the inner side of the blade is larger, and the groove structure is not suitable for being made into a groove structure, and. The following are specific embodiments.

As shown in fig. 5, the trailing edge arc length is L, the arc length from the innermost groove edge to the hub is L1, and L1= L (10% -40%).

As shown in fig. 5, the diameter of the axial projection line of the outer edge of the fan blade is D1, and the diameter of the axial projection line of the outer edge of the hub is D2= D1 (20% -40%); the groove bottom width of the groove is W, the radius of the axial projection line of the protrusion edge is R, the axial projection line length of the vertical line from the protrusion top point to the groove bottom edge is H, and H = W = R = (D1/2-D2/2) = (3% -10%).

In order to ensure the integral structural strength of the blade, reinforcing strips can be arranged on the front edge, the outer edge and the rear edge of the blade, and a plurality of reinforcing ribs can also be arranged on the blade, but the circumferential reinforcement and the arrangement of the plurality of reinforcing ribs can greatly increase the weight of the blade, increase the load and the energy consumption of a motor and reduce the efficiency of an axial flow fan; meanwhile, too many reinforcing rib structures are arranged on the pressure surface of the fan blade, so that the wind resistance of the fan blade is increased, and the fan blade is difficult to rotate; and set up a plurality of heavy grooves along the air current direction at fan blade back pressure face, not only can not increase on the one hand and can reduce blade weight on the contrary, reduce motor load and energy consumption, and on the other hand does not have too big weakening at the structural strength that many grooves of back pressure face formed, prevents that the blade structure from damaging, can not influence the motion of air current yet. The fan blade is integrally formed by injection molding, the demolding direction of the sink groove is required to be consistent with the demolding direction of the hub to ensure successful demolding after injection molding is finished, meanwhile, a cooling process is required after injection molding is finished, certain shrinkage can occur during cooling, the wall thickness is uneven, the amplitude of local shrinkage is larger than that of local shrinkage is smaller, further local collapse is possibly caused, and the air flow condition of a pressure surface is influenced. The following are specific embodiments.

As shown in fig. 2 and 6: a plurality of sinking grooves 7 are formed in the pressure surface of the back of the blade from the rear edge of the blade to the front edge of the blade; the opening direction of the sink groove is the same as the axial direction of the hub; the depth of the sinking groove is changed from the inner edge of the blade to the outer edge of the blade from deep to shallow, so that the thickness of the pressure surface from each position of the bottom of the sinking groove is the same.

When a plurality of sinking grooves exist at the same time, the thicknesses from the bottoms of the sinking grooves of the plurality of sinking grooves to the pressure surface are the same.

The blade of the axial flow fan blade is in a shape with a narrower inner side and a wider outer side, and in order to reduce the weight as much as possible and simultaneously ensure that the reinforcing rib part between two adjacent sinking grooves is as uniform as possible, improve the efficiency of the fan and facilitate the demoulding of the reinforcing rib, the width of the sinking groove is gradually widened from the inner side to the outer side. The following are specific embodiments.

As shown in FIG. 2, the distance between the two walls of the sinking groove is increased from the inner edge of the blade to the outer edge of the blade.

When a plurality of sunken grooves exist, in order to facilitate the manufacture of the model among the sunken grooves, the groove heads of the sunken grooves are arranged on a circumferential line with the hub shaft as the center of a circle, and the groove tails of the sunken grooves are arranged on a circumferential line with the hub shaft as the center of a circle. The following are specific embodiments.

As shown in fig. 5, the axial projection points of the outer ends of the multiple sinking grooves are on the same circular arc line, the diameter of the circular arc line is D1, and D1= D1 (80% -95%); the axial projections of the outer ends of the multiple sinking grooves are on the same circular arc line, and the diameter of the circular arc line is D2, D2= D2 (110% -130%).

In the rotating process of the axial flow fan blade, the front edge part has the function of dividing high-speed airflow into two parts, on one hand, the front edge of the blade is an inwards concave arc line, and the front edge of the blade, especially the part close to the outer edge, can bear larger wind pressure and is easy to deform; on the other hand, the portion where the leading edge is connected to the hub is prone to breakage. Set up the pressure surface that strengthens the strip and be covered with whole blade and link to each other with wheel hub simultaneously, strengthen the arc intensity of the leading edge of blade, prevent simultaneously that the blade from breaking. The following are specific embodiments.

As shown in FIGS. 2-7, the pressure surface of the leading edge and/or the pressure surface of the back edge of the blade are provided with reinforcing strips 8 along the direction of the leading edge.

In the rotating process of the axial flow fan blade, the joint of the front edge of the fan blade and the hub is most easily broken, so that a plurality of reinforcing ribs are arranged; the reinforcing rib is arranged on the back pressure surface because the pressure surface has a relatively large influence on the airflow; meanwhile, the protruding direction of the reinforcing ribs is the same as the direction of the hub, so that demolding after injection molding is facilitated. In the rotating process of the axial flow fan blade, the airflow is divided into two parts when meeting the front edge of the blade, the airflow divided to the back pressure surface flows along the surface of the back pressure surface due to the small air pressure of the back pressure surface, and the heights of the upper end surfaces of the reinforcing ribs are sequentially reduced along the airflow direction to match the flowing direction of the airflow. The following are specific embodiments.

As shown in fig. 2 and 3, a plurality of ribs 9 protruding in the axial direction of the hub are provided on the back pressure surface at the joint between the leading edge of the blade and the hub, and the heights of the upper end surfaces of the plurality of ribs decrease in order from the leading edge of the blade to the trailing edge of the blade.

Fig. 7 shows a comparison between the air discharge capacity per unit time and the noise of three types of gullet blades and blades of a conventional structure at three wind speeds, wherein the model number 1 is an axial flow blade of a conventional structure, the diameter of the blade D1=750mm, the diameter of the hub D2=200 mm, the diameter of the hub L =300 mm, and the weight is 3500 g. The model number A is the diameter D1=750mm of the fan blade, the straight D2=200 mm of the wind wheel hub, the arc length L =300 mm of the tail edge of the fan blade, R = the tooth top height H =17 mm of the tail semicircle, the groove W =17 mm between the tail semicircle teeth, the residual arc length L1=75 mm of the tail edge of the fan blade, the spacing a =51 mm of the tail semicircle teeth, the number of teeth =4 teeth, the outer diameter D1=710 mm of the back pressure surface sinking groove, the inner diameter D2=230 mm of the back pressure surface sinking groove, the uniform glue thickness of the back pressure surface sinking groove = 3mm, and the weight is 2780 g; the model number B is the diameter D1=750mm of the fan blade, the diameter D2=200 mm of the wind wheel hub, the arc length L =300 mm of the tail edge of the fan blade, R = the tooth top height H =10 mm of the tail semicircle tooth space W =10 mm, the residual arc length L1=30 mm of the tail edge of the fan blade, the spacing a =30 mm of the tail semicircle tooth space, the number of teeth =9 teeth, the outer diameter D1=710 mm of the back pressure surface sink groove, the inner diameter D2=230 mm of the back pressure surface sink groove, the uniform glue thickness of the back pressure surface sink groove = 2mm, and the weight is 2650 g; the model number C is the diameter D1=75 mm of the fan blade, the straight D2=200 mm of the wind wheel hub, the arc length L =300 mm of the tail edge of the fan blade, R = the tooth top height H = the groove W =25 mm between the tail semicircular teeth, the residual arc length L1=75 mm of the tail edge of the fan blade, the spacing a =75 mm of the tail semicircular teeth, the number of teeth =3 teeth, the outer diameter D1=700 mm of the back pressure surface sink groove, the inner diameter D2=250 mm of the back pressure surface sink groove, the uniform glue thickness of the back pressure surface sink groove = 4mm, and the weight is 3000 g.

According to comparative analysis of experimental data of three fan blades with the tooth grooves and the fan blades with the traditional structures, under the conditions of three wind speeds, namely high wind speed, medium wind speed and low wind speed, the air exhaust volume of the tooth groove fan blades is larger than that of the fan blades with the traditional structures, wherein the model number A is the largest; under the condition of three wind speeds, namely high, medium and low wind speeds, the noise of the tooth socket fan blade is smaller than that of a fan blade with a traditional structure, wherein the model number A is the smallest. The air discharge amount of the fan blade with the tooth grooves at high, medium and low wind speeds is larger than that of the fan blade with the traditional structure, but the noise volume is slightly reduced, which shows that the product performance of the three kinds of tooth groove fan blades is better than that of the fan blade with the traditional structure, wherein the model number A has the best performance.

Example 2: a fan comprises the axial flow fan blade in the embodiment 1.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims (6)

1. The axial flow fan blade comprises a hub and a plurality of blades arranged around the hub, and is characterized in that a plurality of sinking grooves are formed in the back pressure surface of each blade from the rear edge of each blade to the front edge of each blade; the opening direction of the sink groove is the same as the axial direction of the hub; the depth of the sinking groove is changed from the inner edge of the blade to the outer edge of the blade from deep to shallow, so that the thickness from each part of the bottom of the sinking groove to the pressure-bearing surface is the same.

2. The axial-flow fan blade of claim 1, wherein the distance between the two walls of the sink groove is increased from the inner edge of the blade to the outer edge of the blade.

3. The axial-flow fan blade of claim 1, wherein: the diameter of an axial projection line of the outer edge of the fan blade is D1, and the diameter of the axial projection line of the outer edge of the hub is D2= D1 (20% -40%); the axial projections of the outer end edges of the multiple sinking grooves are on the same circle, the diameter of the circle is D1, D1= D1 (80% -95%); the axial projection of the outer end edges of the multiple sinking grooves is on the same circle, the diameter of the circle is D2, D2= D2 (110% -130%).

4. The axial-flow fan blade according to claim 1, wherein a reinforcing strip is arranged on the pressure-bearing surface and/or the back pressure surface of the front edge of the fan blade along the direction of the front edge.

5. The axial-flow fan blade according to claim 1, wherein a back pressure surface at a junction of the front edge of the fan blade and the hub is provided with a plurality of reinforcing ribs protruding in the axial direction, and heights of upper end surfaces of the plurality of reinforcing ribs are sequentially reduced from the front edge of the fan blade to the rear edge of the fan blade.

6. A fan, characterized by comprising any one of the axial-flow fan blades of claims 1-5.

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