KR102326771B1 - Impeller and method for manufacturing the same, and blade for an impeller - Google Patents

Abstract

Disclosed is a manufacturing method of an impeller, which is not required to additionally form or drill a hole for fastening a screw to a blade, reduces frictional force with air of the blade to improve efficiency of an impeller, and removes a problem caused by generation of a chip caused by screw-fastening. The manufacturing method of the impeller comprises: a blade base material extrusion step of forming a blade base material by extrusion; a resin coating step of coating a resin on a surface of the blade base material to form a resin layer; a drying step of drying the blade base material where the resin is coated; a blade base material cutting step of generating a plurality of blades for an impeller by cutting the dried blade base material; and a step of fixating the blade for an impeller between a main plate and a ring plate by a rolling type screw.

Description

Impeller and method for manufacturing the same, and blade for an impeller

The present invention relates to an impeller, a method for manufacturing the same, and improvement of the blade for the impeller, and more particularly, to an impeller that can be suitably used for a blower, a method for manufacturing the same, and improvement of the blade for the impeller.

In general, a blower is a device for transferring air by changing mechanical energy into pressure energy, and is widely used in residential facilities, business facilities, industrial facilities, and the like. Matters to be considered when using a blower include the blower's air volume, pressure, motor power and size. The blower air volume and pressure are determined by the outer diameter of the blower impeller, the width of the blade, and the number of rotations.

Conventionally, when manufacturing an airfoil impeller, the blade is fixed between the main plate and the ring plate by welding. However, the welding operation is very difficult and time consuming, and the quality of the parts varies depending on the problem of thermal deformation and the skill of the welder. There were problems.

In order to solve the above problems, after manufacturing the impeller blade by extrusion molding with light metal, drill a screw hole at the intersection of the vertical wall reinforcement plate and the horizontal wall reinforcement plate, insert the blade between the back plate of the impeller and the main plate, and then insert the rivet Manufacturing of an impeller by a process of fastening with a screw or a screw is disclosed in the publication of Patent Publication No. 1995-0029599 (title of invention: impeller blade and manufacturing method thereof, referred to as "prior invention 1").

In addition, something similar to the invention of Yeon Seung-seop is disclosed in Patent Publication No. 1998-0002891 (title of the invention: manufacturing method of a prefabricated blower impeller, referred to as "prior invention 2").

In addition, by coating the fluororesin by melting and cooling the surface of the steel plate to which the blade is fixed, it can be used to collect contaminants generated in manufacturing plants that use strong acid chemicals such as sulfuric acid and hydrochloric acid. This is disclosed in the Patent Registration No. 10-1479023 (title of the invention: acid-resistant impeller manufacturing method, referred to as "prior invention 3").

In addition, each part has a tapered non-circular cross section, and the width of the thread becomes narrower toward the end of each part, and it is disclosed in Japanese Patent Application Laid-Open No. 2008-249092 (title of invention: self-tapping screw, "Prior to Invention 4") is disclosed in the published patent publication.

The present inventors have noticed that the above prior inventions 1 and 2 solve the problems caused by fixing the blades by welding, but have the following problems.

First, prior inventions 1 and 2 require a lot of time to separately form or perforate a plurality of screw holes or a plurality of bolt fastener insertion holes at both ends of the cut blade after cutting the long extruded one in the cross-sectional shape of the blade. , there is a problem of material wastage, and there is also a risk of product defect.

Second, when the impeller rotates at high speed, heat is generated in the blades due to friction between the blades and air, which reduces the efficiency of the impeller because the rotational power of the impeller is converted into thermal energy.

Third, prior inventions 1 and 2 do not specifically mention the process of fastening the blade between the main plate and the back plate with a screw, but the conventional screw fastening method according to the method of the prior inventions 1 and 2 does not form a spiral but perforates It is a method of fastening a tapping screw in one hole. Since the tapping screw is fastened while cutting the inner peripheral surface of the hole formed in the blade, chips are generated and it must be cleaned frequently, and there is a risk of scratching the surface of the part. In addition, chips generated during the tapping screw fastening process may remain inside the hole, and in order to remove the chip inside the hole, the fastened screw must be disassembled and fastened again.

In addition, since the tapping screw is coupled to the blade while cutting the inner peripheral surface of the hole of the blade made of relatively low hardness, such as aluminum, the coupling force is weak and there is a risk of loosening. .

In addition, the blade for the impeller is made of light metal such as aluminum, but there is a problem that it is corroded by various gases or moisture.

In addition, Prior Invention 3, not the blade, is coated with a fluororesin on the steel plate to which the blade is fixed, and the blade under high pressure wears out quickly, and the friction between the blade and the air is reduced when the impeller rotates at high speed. Since the rotational power of the impeller is converted into thermal energy by the

In addition, the prior invention 4 has a problem in that it takes a lot of force to fasten because the spiral is configured in two stages of a fastening guide part and a fastening part.

In addition, in the prior inventions 1 to 3, there is also a problem of poor compatibility because the blades are installed only at a predetermined angle.

And in the prior inventions 1 and 2, when the impeller rotates at a high speed, a vortex is generated at the outer end of the blade, thereby reducing the efficiency of the impeller.

An object of the present invention is to reduce material wastage, there is no need to separately form a hole for screw coupling, and a method for manufacturing an impeller capable of reducing the time required for manufacturing an impeller blade while also having a small risk of product defect, and To provide a method for manufacturing a blade for an impeller.

Another object of the present invention is to provide a method for manufacturing an impeller with excellent efficiency and a method for manufacturing a blade for the impeller therefor.

Another object of the present invention is to provide a method for manufacturing an impeller that does not require a separate loosening prevention measure because it takes less force to fasten the screw for fixing the blade and has a strong fastening force, so there is no need to take a separate loosening prevention measure and a blade manufacturing method for the impeller for this purpose is doing

Another object of the present invention is to provide a method for manufacturing an impeller having excellent corrosion resistance of the blade and a method for manufacturing a blade for the impeller therefor.

Another object of the present invention is to provide a method for manufacturing an impeller that has excellent blade compatibility and can be installed by changing the tangential angle of the blade as needed.

Another object of the present invention is to provide a blade for an impeller capable of improving the efficiency of the impeller by suppressing the generation of turbulence and inducing the generation of laminar flow, and an impeller and a method of manufacturing the impeller using the same.

The method for manufacturing an impeller according to the present invention comprises: a blade manufacturing step of making a plurality of blades for an impeller having a plurality of hollow portions, a reinforcing portion formed adjacent to the hollow portion, and a fastening hole respectively formed in a plurality of the reinforcing portions; and a plurality of impeller blades while forming a rolled spiral in the fastening hole using a rolled screw coupled to the fastening hole, and a main plate in which the blade fastening holes formed at intervals are arranged in a plurality of rows And a blade fixing step of fixing between the ring plate,

The blade manufacturing step, the blade base material extrusion step of molding the blade base material by extrusion; a resin coating step of coating a resin on the surface of the blade base material to form a resin layer; a drying step of drying the base material of the blade coated with the resin; and a blade base material cutting step of cutting the dried blade base material to make a plurality of blades for the impeller, wherein the blade base material extruding step comprises a plurality of the fastening holes with a plurality of hollow parts and a plurality of the reinforcement parts; Formed together at the same time, the blade base material is formed with a guide vane that suppresses vortex generation and induces laminar airflow by guiding the airflow outward as the curvature of the surface is greater than the inner surface and curved toward the convex outer surface at the tail. extruding, and the blade base material cutting step cuts the blade base material on which the guide blade is formed to make a plurality of blades for the impeller, and the blade fixing step can be fixed by adjusting the installation angle of the blade for the impeller. At least two of the blade fastening holes in each row of the main plate and the ring plate are configured to include fixing a plurality of blades for the impeller between the main plate and the ring plate, which are formed in a long hole.

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In the resin coating step, the blade base material is placed in a resin solution consisting of 5 to 7% by weight of a water-soluble amino acrylic resin solution and 93 to 95% by weight of water and then electrodeposited, but the thickness of the resin layer formed by the electrodeposition coating It is good to make it 10-20 μm.

The blade fixing step is formed along the outer circumferential surface of the tapered non-circular cross-section, and the distance between the crests of the spirals facing in the radial direction gradually increases upward from the stabilizing spiral and the stabilizing spiral in 2-3 rows at the lower end. The rolled screw having a helix formed in a circular cross-section above the non-circular cross-section, which has a spiral that is gradually closer to a circular shape from a similar triangle, and whose inclination is smaller than the portion where the stabilizing spiral is formed, is inserted into the blade fastening hole. By rotating and fastening the fastening hole through the fastening hole, the rolled spiral is formed without chips by sequentially press-fitting by the stabilizing spiral tapered to the inner circumferential surface of the fastening hole, followed by the ratio above the stabilizing spiral It is preferable to have a configuration including making the rolled spiral of the inner circumferential surface of the fastening hole completed by the spiral of the circular cross-section.

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Among the blade fastening holes in each row, it is preferable that one of both edges is formed as the long hole.

The blade fixing step is preferably fixed so that the tangent angle of the blade for the impeller is in the range of 10 degrees to 20 degrees.

The impeller according to the present invention includes a main plate having a through hole in the central portion and having blade fastening holes formed at intervals along the periphery of the through hole arranged in a plurality of rows; a ring plate in which a through hole is formed in the central portion and blade fastening holes formed at intervals along the circumference of the through hole are arranged in a plurality of rows; and a fastening hole formed at a distance, disposed between the main plate and the ring plate, and both ends are formed by a rolled screw coupled while forming a rolled spiral in the fastening hole through the blade fastening hole. Comprising a plurality of impeller blades respectively fixed to the main plate and the ring plate,

At least two of the blade fastening holes of each row of the main plate and the ring plate are formed in a long hole so as to be fixed by adjusting the installation angle of the blade for the impeller, and the blade for the impeller is a tail part The curvature of the surface is larger than the inner surface and is curved toward the convex outer surface to guide the air flow outward, thereby suppressing the occurrence of vortex and guiding the laminar air flow.

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According to the present invention, since it is not necessary to separately form or drill a hole for screw fastening or a plurality of bolt fastener insertion holes in the blade, it takes less time, can solve the problem of material waste, and reduce the risk of product defect.

In addition, according to the present invention, since the surface of the blade is coated with a smooth resin, friction with air is reduced even when the impeller rotates at high speed, thereby improving the efficiency of the impeller, preventing corrosion of the blade, and preventing chip generation due to screw fastening. All of the following problems can be solved.

According to the present invention, the assembly rigidity of the impeller can be secured and the loosening prevention force can be maintained by fixing the blade to the main plate and the ring plate using a rolled screw while the fastening force is low and the screw fastening is easy. .

In particular, if the blade is made of high-strength aluminum and coated with a water-soluble aminoacrylic resin on the surface, the blade has good weather resistance and durability such as acid resistance, chipping resistance, scratch resistance, crack resistance, yellowing resistance, repainting resistance, etc. , light weight and beautiful appearance can be secured.

In some cases, a resin may be coated on the inner circumferential surface of the fastening hole, and in this case, the initial screwing is performed smoothly and the inner circumferential surface of the fastening hole is not scratched due to the elasticity of the resin between the fastening spirals. It is possible to prevent loosening of the screws that fix the to the main plate and the ring plate.

According to the present invention, an impeller can be manufactured using various types of blades without a change in separate manufacturing facilities or production facilities.

According to the present invention, it is possible to easily manufacture a blower having a performance suitable for the needs of the consumer by using a standard blade but changing the tangent angle and installing it.

According to the present invention, the efficiency of the impeller is improved by suppressing the generation of turbulence at the tail of the impeller blade and making it laminar.

1 is a process diagram showing a method for manufacturing a blade for an impeller according to the present invention and a process for manufacturing an impeller using the same;
Figure 2 is a partial perspective view showing the blade base material by extrusion,
3 is a view showing a state of electrodeposition coating the resin on the surface of the extruded blade base material;
4 is a view showing a state of drying the resin-coated blade base material;
5 is a view for explaining the process of cutting the base material of the blade coated with resin on the surface using a rotary saw;
6 is a perspective view of a blade for an impeller made according to the method of the present invention;
7 is an exploded perspective view of the impeller for explaining the process of making the impeller using the blades made according to the method of the present invention;
8 is a perspective view of an impeller made according to the method of the present invention;
9 is a rear perspective view of an impeller made according to the method of the present invention;
Fig. 10 is a front view showing the rolled screw used to fix the blade to the main plate and the ring plate;
11a to 11c show the shape of the crest of the helix at positions ii, jj and kk of FIG. 10;
12 is a view showing another example of the main plate;
13 is a view showing another example of a ring plate;
14 is a view for explaining the installation angle of the blade for the impeller,
15 is a perspective view showing another example of a blade base material according to the present invention;
16 is a perspective view of a blade for an impeller made using the base material of FIG. 15;
17 is a front view of an impeller using a blade for the impeller of FIG. 16;
18 is a view showing the air flow in the blade for the impeller that does not have a guide vane;
19 is a view showing the air flow in the blade for the impeller having a guide blade on the tail;
20 is a view showing a modified example of the main plate;
21 is a view showing a modified example of the ring plate.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the molten metal is extruded to make a blade base material 110a having an airfoil cross-sectional shape as shown in FIG. 2 . During extrusion, the blade base material 110a is extruded into a cross section having a plurality of hollow portions 112 and a plurality of reinforcing portions 114 inside the blade base material 110a. The reinforcing part 114 is formed between the adjacent hollow parts 112 . In addition, more preferably, when the blade base material 110a is extruded, that is, when the hollow part 112 and the reinforcement part 114 are formed, the fastening hole 116 is simultaneously formed inside the reinforcement part 114. (S1).

A light metal is suitable as a material used for extrusion of the blade base material 110a, and in particular, high rigidity aluminum is suitable.

Next, a resin is coated on the surface of the blade base material 110a. As the coating resin, a water-soluble amino acrylic resin may be suitably used. Preferably, the resin is coated by electrodeposition coating. Since the principle of electrodeposition coating is a known technique, a detailed description will not be given here.

However, since the most suitable resin for the blade base material 110a and its specific component ratio and coating thickness have not been previously known, it will be described in detail here as follows.

As shown in FIG. 3, the blade base material 110a is placed in the resin solution 12, preferably composed of 5 to 7 wt% of a water-soluble amino acrylic resin solution contained in the container 10, and 93 to 95 wt% of water, and then further Preferably, the blade base material 110a is connected to the negative side of the power supply PS to the resin solution 12 composed of 6% by weight of a water-soluble amino acrylic resin solution and 94% by weight of water, and an electrode ( AN) and applying the power source (PS), the resin layer 118 is formed by uniformly coating the entire surface of the blade base material 110a by the principle of electrodeposition coating (S2). At this time, the cross-section and the fastening hole 116 of the blade base material 110a are covered with a cover so that the resin is not coated and the fastening hole 116 is blocked. Accordingly, the resin layer 118 is formed on the surface of the blade base material 110a exposed to the resin solution 12 . In this way, the characteristics and advantages of the water-soluble amino acrylic resin can be brought to the impeller blade 110 and impeller 100 as it is.

Here, the "water-soluble amino acrylic resin solution" includes 49 to 51 parts by weight of amino acrylic resin, 20 to 25 parts by weight of IPA (2-Propanol, CAS NO: 67-63-0), and BC (Butyl Cellosolve, CAS NO: 111-76-2) 3 to 8 parts by weight and 16 to 28 parts by weight of water are suitable.

The thickness of the resin layer 118 by the electrodeposition coating is suitable 10 to 20㎛. Of course, the thickness of the resin layer 118 may be increased or decreased according to the purpose of the impeller. For example, if the driving speed of the impeller is low, the driving time is short, and it is used in a place where there is no harmful gas, the thickness of the resin layer 118 may be reduced. However, when the thickness of the resin layer 118 is too thin to less than 10 μm, it can be easily removed by contact with other objects in the handling process of the blade base material 110a or the assembly process of the completed impeller blade 110, etc. Since it can be easily modified by light, the thickness of the resin layer 118 should be at least 10 μm. Conversely, if the driving speed of the impeller is high and the continuous driving time is long, or if it is used in a place where harmful gas is present, it is preferable to increase the thickness of the resin layer 118 to about 20 μm. Although it is possible to set it to 20 μm or more depending on the environment of use, if the thickness of the resin layer 118 is too thick, the efficiency of the resin coating decreases and a problem occurs that it takes too much time.

In some cases, the fastening hole 116 may not be blocked so that the resin is uniformly coated on the inner circumferential surface of the fastening hole 116 formed in the blade base material 110a.

Then, the resin-coated blade base material 110a is put into the dryer 20 as shown in FIG. 4 , and preferably dried at 170 degrees Celsius to 190 degrees Celsius for 20 minutes to 40 minutes. More preferably, the resin-coated blade base material (110a) is dried at about 180 degrees Celsius for 30 minutes (S3). When the thickness becomes thick, the drying time and temperature tend to be slightly increased, and in practice, the temperature can be increased or decreased in the range of about 5 degrees Celsius, and the time can be increased or decreased in the range of about 5 minutes.

After drying, the dried blade base material 110a is cut to the required length using a cutter equipped with a rotary saw blade 30, etc. as shown in FIG. 5, and the blade 110 for the impeller as shown in FIG. make (S4). In this embodiment, it shows that the blade base material (110a) is cut in parallel. And those used for the manufacture of the same impeller will be cut to the same length. The cutting length of the blade base material 110a may be changed according to the required capacity or usage of the impeller.

Next, referring to FIGS. 7 to 9 , a plurality of impellers using a screw 130 coupled to a plurality of fastening holes 116 respectively formed in a plurality of impeller blades 110 made by the above process The blade 110 is fixed between the main plate 150 and the ring plate 160 (S5). At this time, as the screw 130, preferably, a rolled bolt is used. This will be described in more detail later.

As can be seen from FIGS. 7 to 9 , the main plate 150 has a through hole 152 for mounting a hub to which the motor shaft is coupled in the central portion, and the hub is fixed along the periphery of the through hole 152 . A hub fastening hole 154 is formed so as to be able to do so, and one end portion of the impeller blade 110 is fixed to the main plate 150 using a plurality of screws 130 to the outside thereof. The fastening holes 156 are formed in a plurality of rows. The number of rows in which the blade fastening holes 156 are installed is determined according to the number of blades 110 for the impeller installed in the impeller 100 . 7 to 9 show that 10 blades 110 for the impeller are used. In this embodiment, it is shown that the three blade fastening holes 156 in each row are spaced apart along an approximately spiral path.

The central part of the ring plate 160 fixed to the cross-section of the blade 110 for the impeller opposite the main plate 150 is formed with a through hole 162 that allows external air to flow into the impeller, and the through hole ( 162) The blade fastening holes 164 for fixing the opposite cross-section of the impeller blade 110 to the ring plate 160 using a plurality of screws 130 along the circumference are formed in a plurality of rows.

That is, between the main plate 150 and the ring plate 160, a plurality of impeller blades 110 spiral along the periphery of the through hole 152 of the main plate 150 and the through hole 162 of the ring plate 160. The impeller according to the present invention ( 100) constitutes.

10 and 11A to 11C show a rolled screw 130 made of a rolled bolt for fixing the main plate 150 and the ring plate 160 to the impeller blade 110 according to the present invention. The rolled screw 130 has a shaft 131 on which a spiral 132 is formed and a head 136 installed on the upper end of the shaft 131 . A fastening tool coupling groove 137 is formed in the head 136 . The shaft portion 131 preferably consists of a non-circular cross-sectional portion 131b up to the circular cross-sectional portion 131a of the upper end.

The rolled screw 130 has a helix 132 formed from the non-circular cross-section 131b to the top circular cross-section 131a. Helix 132 has a crest 132a and a root 132b. A stabilizing spiral 132c formed along a relatively highly tapered non-circular cross-section 131b at the lower end of the rolled screw 130, and in which the distance between the crests 132a facing in the radial direction gradually increases upward. ) is formed. The stabilizing spiral 132c is formed in about 2 to 3 lines from the bottom to the top. The tapered non-circular cross-section 131b of the lower end of the rolled screw 130 has a similar triangular shape as shown in FIG. 11C . As shown in FIGS. 11b and 11c, the non-circular cross-section 131b is a similar triangle to a circular shape as it goes upward from the stabilizing spiral 131c at the lower end, and the inclination is smaller than the portion where the stabilizing spiral 131c is formed. . When the screw 130 of this rolled type is rotated and fastened to the fastening hole 116 formed in the impeller blade 110, the inner circumferential surface of the fastening hole 116 is tapered sequentially by the stabilizing spiral 132c. It is press-fitted to start to form a rolled spiral without chipping, and then the spiral is completed by the spiral 132 of the non-circular cross-section 131b above the stabilizing spiral 132c.

In some cases, when a resin is coated on the inner circumferential surface of the fastening hole 116, when a spiral is formed on the inner circumferential surface of the fastening hole 116 without chip generation by the rolled screw 130 as above, the initial The screw coupling is made more smoothly and the impeller blade 110 is separated from the main plate 150 and the ring plate 160 due to the frictional force of the resin between the spirals that are fastened without being scratched when the screw is spirally formed on the inner peripheral surface of the fastening hole 116. ) can enjoy the effect of not loosening the screw 130 that is fixed to the.

The centrifugal force test to test whether the rotating impeller blade 110 is fastened with appropriate strength during operation of the blower made using the impeller 100 made as described above is conducted at 130% of the operating rotational speed or 4320 RPM. . In this embodiment, each impeller blade 110 is supported by six rolled screws 130, so that sufficient rigidity is ensured. In addition, in order to prevent rotational vibration of the impeller 100, a vibration reduction balancing operation is performed in accordance with KS B 6311.

Figure 12 is a view showing another example of the main plate, Figure 13 is a view showing another example of the ring plate, Figure 14 is a view for explaining the installation angle of the blade for the impeller.

Optionally, at least two of the blade fastening holes 156 and 164 of each row formed in the main plate 150 and the ring plate 160, preferably, the blade fastening holes 156 and 164 of both edges are for the impeller It is formed in a long hole so that the installation angle of the blade 110 can be adjusted. The blade fastening holes 156 and 164 formed as long holes preferably have rotation preventing protrusions 156a and 164a for preventing rotation of the screw for fixing the impeller blade 110 to the inner circumferential surface.

Referring to FIG. 14 , if you want to install the impeller blade 110 at a tangential angle of 10 degrees, the inner blade fastening holes 156 and 164 combine the outermost screws and the outer blade fastening holes 156 and 164 . In this case, you only need to connect the screw in the innermost part. Here, the tangent angle refers to a straight line connecting the center of the fastening hole 116 at both edges of the tangent line in contact with the circle inscribed to the impeller blade 110 and the impeller blade 110 is formed by means angle. In the present invention, the blade 110 for the impeller installed in this way at a tangential angle of 10 degrees is referred to as a "standard angle installation blade". In addition, in the present invention, a tangent line as a reference for a tangent angle is based on a tangent line of the "standard angle installation blade". The impeller 100 having the blade 110 for the impeller installed at a standard angle is used as a high-efficiency impeller for air-conditioning, for medium static pressure or low static pressure for air conditioning.

The impeller 100 having the blade 110 for the impeller installed at an elevation angle of 15 to 20 tangential angle is a high-efficiency impeller for air conditioning and is used for a fixed pressure for air conditioning.

When the impeller blade 110 is to be fixed to the main plate 150 and the ring plate 160 at a tangential angle of 20 degrees, the innermost screws are combined in the inner blade fastening holes 156 and 164 and the outer blade is fastened. In the balls (156, 164), it is enough to fix the blade 110 for the impeller by coupling the screw to the outermost.

When the tangential angle is 10 degrees, the angle between the line connecting the tail end of the impeller blade 110 and the center of the impeller 100 and the tangent of the "standard angle installation blade" is about 50 degrees, when the tangent angle is 10 degrees, The angle between the line connecting the tail end of the impeller blade 110 and the center of the impeller 100 and the tangent of the "standard angle installation blade" is about 40 degrees.

When using the middle portion of the inner and outer blade fastening holes (156, 164), the impeller blade 110 can be installed at a tangential angle of 15 degrees.

As the tangential angle of the blade 110 for the impeller increases, the pressure applied to the blade 110 for the impeller increases.

That is, according to the present invention, it is possible to make a product having a different installation angle of the blade 110 for the impeller without using a separate main plate 150 and the ring plate 160 .

15 is a perspective view showing another example of a blade base material according to the present invention, FIG. 16 is a perspective view of a blade for an impeller made using the blade base material of FIG. 15, and FIG. 17 is a front view of the impeller using the blade for the impeller of FIG.

Occasionally, the blade base material 110a has a cross-sectional shape in which the thickness decreases from the thick tip to the tail, and the guide blade 111 has a large surface curvature at the tail and is curved toward the convex outer surface. can be extruded. The blade base material 110a extruded in this way is coated with resin on the surface by the same process as described above, and then cut to the required length. (110) can be made. The rest is the same as described above with reference to FIGS. 5 and 6 .

The blades 110 for the impeller shown in FIG. 16 between the main plate 150 and the ring plate 160 described in FIGS. 12 and 13 may be installed at a tangential angle of 10 degrees or 20 degrees as shown in FIG. 17 . In some cases, of course, the blades 110 for the impeller may be installed at a tangential angle of 15 degrees.

When using the blade 110 for the impeller according to the present invention as shown in FIG. 16, even if the blade 110 for the impeller is installed at a low tangential angle, it can be used for a fixed pressure, and the same degree as the standard type of high speed at low speed rotation. It can exhibit performance and can be applied to high-efficiency, high-pressure impellers for air conditioning. In addition, when using the blade 110 for an impeller according to the present invention as shown in FIG. 16, it is suitable for a high-pressure impeller.

18 is a view showing the air flow in the impeller blade without a guide blade, Figure 19 is a view showing the air flow in the impeller blade having a guide blade in the tail.

When the impeller rotates at high speed, turbulence is generated on the outer surface of the blade 110 for the impeller, which has a greater curvature than the inner surface and is convex, due to the vortex as indicated by the arrow in FIG. 18, thereby reducing the efficiency of the impeller.

On the other hand, as shown in FIG. 19 , the impeller blade 110 in which the guide blade 111 is curved toward the outer surface having a large curvature is formed in the tail, the guide blade 111 directs the air flow outward as indicated by the arrow. By guiding, the vortex generation is suppressed. Accordingly, when the impeller blade 110 having the guide blade 111 is used, the generation of turbulence on the outer surface of the impeller blade 110 is suppressed, so that the air flow becomes laminar, and the guide blade 111 is not provided. Compared to that, it improves the efficiency of the impeller.

20 is a view showing a modified example of the main plate, Figure 21 is a view showing a modified example of the ring plate.

In some cases, the blade fastening holes 156 and 164 of each row may be formed to be gradually longer from the outside to the inside as shown in FIG. 20 or may be formed to be longer from the inside to the outside as shown in FIG. 21 .

The rest is the same as described above with reference to FIGS. 12 and 13 .

The present invention has the potential to be used to make impellers used in blowers.

10: container 12: resin solution
100: impeller 110: blade for the impeller
110a: blade base material 111: guide feather
112: hollow part 114: reinforcement part
116: hole for fastening 130: screw
131a: circular cross-section 131b: non-circular cross-section
132c: stabilizing helix 150: main plate
152: through hole 154: hub fastener
156, 164: blade fastening hole 156a, 164a: rotation prevention projection
160: ring plate 162: through hole

Claims (11)

A blade manufacturing step of making a plurality of hollow portions and a plurality of blades for the impeller having a reinforcing portion formed adjacent to the hollow portion and a plurality of fastening holes respectively formed in the plurality of reinforcing portions; and
A main plate in which a plurality of impeller blades are arranged in a plurality of rows with a plurality of blade fastening holes formed at intervals while forming a rolled spiral in the fastening hole using a rolled screw coupled to the fastening hole; Including a blade fixing step for fixing between the ring plates,
The blade manufacturing step,
A blade base material extrusion step of molding the blade base material by extrusion;
a resin coating step of coating a resin on the surface of the blade base material to form a resin layer;
a drying step of drying the base material of the blade coated with the resin; and
A blade base material cutting step of cutting the dried blade base material to make a plurality of blades for the impeller,
The blade base material extruding step forms a plurality of the fastening holes together with the plurality of hollow portions and the plurality of reinforcing portions at the same time, and the curvature of the surface of the tail portion is greater than the inner surface and is curved toward the convex outer surface to flow the air Extruding the blade base material formed with a guide blade that suppresses vortex generation and induces a laminar air flow by guiding the
The blade base material cutting step cuts the blade base material on which the guide blade is formed to make a plurality of blades for the impeller,
The blade fixing step,
At least two of the blade fastening holes of each row of the main plate and the ring plate are formed in a long hole between the main plate and the ring plate so as to be fixed by adjusting the installation angle of the blade for the impeller. Impeller manufacturing method comprising fixing the blade for the impeller. delete delete The method of claim 1, wherein in the resin coating step, the blade base material is placed in a resin solution composed of 5 to 7% by weight of a water-soluble amino acrylic resin solution and 93 to 95% by weight of water and then electrodeposited, but formed by the electrodeposition coating. The impeller manufacturing method, characterized in that it comprises making the thickness of the resin layer to be 10 ~ 20㎛. The method of claim 1, wherein the fixing of the blade comprises:
A stabilizing spiral formed along the outer circumferential surface of the tapered non-circular cross-section and the distance between the crests of the spirals facing in the radial direction gradually increases upwards. The screw of the rolled type having a helix formed in the circular cross-section above the non-circular cross-section and having a helix whose inclination becomes smaller than the portion in which the stabilizing helix is formed is inserted into the fastening hole through the blade fastening hole. By rotating and fastening, the rolled spiral is sequentially press-fitted by the stabilizing spiral tapered to the inner circumferential surface of the fastening hole to form the rolled spiral, followed by the spiral of the non-circular cross-section above the stabilizing spiral. The impeller manufacturing method, characterized in that it comprises making the rolled spiral of the inner circumferential surface of the fastening hole by the completion. delete The method of claim 1 , wherein one of both edges of the blade fastening holes in each row is formed as the long hole. The method of any one of claims 1, 4, 5 and 7, wherein the fixing of the blade comprises:
Impeller manufacturing method, characterized in that fixed so that the tangent angle of the blade for the impeller is in the range of 10 to 20 degrees. a main plate having a through hole in the central portion and having blade fastening holes formed at intervals along the periphery of the through hole arranged in a plurality of rows;
a ring plate in which a through hole is formed in the central portion and blade fastening holes formed at intervals along the circumference of the through hole are arranged in a plurality of rows; and
It has a fastening hole formed at an interval, is disposed between the main plate and the ring plate, and both ends are connected to the main by a rolled screw coupled while forming a rolled spiral in the fastening hole through the blade fastening hole. A plate and a plurality of impeller blades respectively fixed to the ring plate,
At least two of the blade fastening holes of each row of the main plate and the ring plate are formed as long holes so as to be fixed by adjusting the installation angle of the impeller blade,
The impeller blade is curved toward the convex outer surface, the curvature of the surface is larger than the inner surface, and guides the airflow outward, thereby suppressing the occurrence of vortex and guiding the laminar airflow. Characterized impeller. delete delete

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