KR102583841B1 - Air circulation fan - Google Patents

Abstract

An impeller formed of a cylindrical side curved surface and an end surface forming the upper and lower sides of the side curved surface, and having a plurality of blades arranged in the circumferential direction; a casing formed to surround the impeller, including a discharge port disposed on the side curved surface, and a bell mouth disposed open in at least one of the end surfaces of the upper and lower surfaces of the impeller; And a motor coupled to the impeller to rotate the impeller, wherein the blade includes a blade body formed in a plate shape; and an end concave portion in which a portion of an edge of the blade body facing the bell mouth is concave. Accordingly, noise and vibration are reduced, and a blowing fan for air purification with high energy efficiency is provided.

Description

Air circulation fan {Air circulation fan}

The present invention relates to blowing fans, and more specifically, to blowing fans for air circulation used in ventilators, air conditioning equipment, etc.

Blower fans are used to circulate air and are used in various air conditioning devices such as air conditioners, ventilators, and air purifiers. Blower fans are classified into various types depending on the type of fan, and sirocco fans are widely used in air conditioning devices.

In addition, blowing fans of air conditioning devices such as air purifiers, ventilators, and air conditioners are mostly installed indoors, and the noise and vibration generated by the blowing fans account for most of the noise and vibration generated by air conditioning devices. Noise and vibration are one of the main complaints from consumers. Additionally, noise and vibration cause loss of power, which can also be a factor in reducing energy efficiency.

Therefore, there is an urgent need to develop a blowing fan for air circulation that reduces noise and vibration and is highly energy efficient.

Embodiments of the present invention were devised to solve the above problems, and are intended to provide a blowing fan for air purification with reduced noise and vibration and high energy efficiency.

In order to solve the above problems, an embodiment of the present invention includes an impeller formed with a cylindrical side curved surface and an end surface forming the upper and lower sides of the side curved surface, and having a plurality of blades arranged in the circumferential direction; a casing formed to surround the impeller, including a discharge port disposed on the side curved surface, and a bell mouth disposed open in at least one of the end surfaces of the upper and lower surfaces of the impeller; And a motor coupled to the impeller to rotate the impeller, wherein the blade includes a blade body formed in a plate shape; and an end concave portion in which a portion of an edge of the blade body facing the bell mouth is concave.

The blade body is preferably formed to have a curved surface that is curved in the radial direction.

It is effective that the blade further includes an inner peripheral extension portion extending from the inside of the blade body.

The inner peripheral extension portion is preferably formed in a flat shape.

It is effective for the inner peripheral extension to further include an inclined edge that slopes downward so that the width gradually increases from the end facing the bell mouth to the other end.

It is preferable that the angle between the inclined edge and the end surface is between 90 degrees and 95 degrees.

A fixing ring surrounding the outside of the plurality of blades and fixing the blades; It is effective to further include a peripheral connection part extending from the blade body toward the fixing ring.

The outer connecting portion is formed in a plate shape.

It is effective that the blade becomes thicker as it moves inward from the edge facing the bell mouth.

The casing preferably further includes a bell mouth ring portion protruding to surround one end of the blade on an inner peripheral portion in contact with the bell mouth.

According to the problem solving means of the present invention as discussed above, various effects including the following can be expected. However, the present invention does not require all of the following effects to be achieved.

The present invention has a low suction and high blowing effect compared to conventional blowing fans for air circulation.

Therefore, the present invention can achieve high airflow volume with low energy.

Additionally, as the flow occurs symmetrically and smoothly, there is also a noise reduction effect.

1 is a perspective view of a blowing fan for air circulation according to an embodiment of the present invention.
Figure 2 is a bottom perspective view of Figure 1
Figure 3 is a cross-sectional view taken along line III-III in Figure 1
Figure 4 is a perspective view of the impeller of Figure 1
Figure 5 is an enlarged plan view of portion V of Figure 4
Figure 6 is an enlarged perspective view of a partial fracture of the impeller of Figure 1
Figure 7 is an enlarged plan view illustrating the shape of the impeller.
Figure 8 is an enlarged perspective view of a partial fracture of the impeller
Figure 9 is a schematic diagram showing the results of flow analysis of the velocity of the fluid in cross sections IX-IX of Figure 4
Figure 10 is a schematic diagram showing the results of flow analysis of the pressure of the fluid in cross sections IX-IX of Figure 4
Figure 11 is a schematic diagram showing the results of flow analysis of the fluid velocity in cross section XI-XI of Figure 4
Figure 12 is a schematic diagram showing the results of flow analysis of the pressure of the fluid in cross section XI-XI of Figure 4
Figure 13 is a schematic diagram showing the flow of flow passing through the impeller on the side curved surface as a velocity vector.

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

FIG. 1 is a perspective view of a blowing fan for air circulation according to an embodiment of the present invention, FIG. 2 is a bottom perspective view of FIG. 1, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1, and FIG. 4 is a perspective view of the impeller of FIG. 1. , FIG. 5 is an enlarged plan view of portion V of FIG. 4, FIG. 6 is an enlarged partially broken perspective view of the impeller of FIG. 1, FIG. 7 is a partially enlarged plan view schematizing the shape of the impeller, and FIG. 8 is an enlarged partially broken perspective view of the impeller.

As shown in these drawings, the blowing fan for air circulation in one embodiment of the present invention is formed by a cylindrical side curved surface 102 and an end surface 101 forming the upper and lower sides of the side curved surface 102, and has a circumference. An impeller 100 with a plurality of blades 110 arranged in one direction, an outlet 201 formed to surround the impeller 100 and disposed on the side curved surface 102, and the upper and lower surfaces of the impeller 100. A casing 200 including a bell mouth 202 opened and disposed on at least one of the end surfaces 101, and a motor (not shown) coupled to the impeller 100 and rotating the impeller 100. ) includes.

The impeller 100 is formed in a cylindrical shape. That is, the impeller 100 is formed in a cylindrical shape defined by a side curved surface 102 and an end surface 101, and a central partition 130 is formed at the central point in the height direction, with the central partition 130 as the center. It is formed so that the top and bottom are symmetrical. A motor fixing part 140 to which the motor 300 can be fixed is formed on the central partition 130.

A plurality of blades 110 are arranged in the circumferential direction above and below the central partition 130, and a fixing ring 120 is formed to surround the outside of the plurality of blades 110 and secure the blades 110.

The blade 110 includes a blade body 111 formed in a plate shape, an inner peripheral extension portion 112 extending from the inside of the blade body 111, and a fixing ring 120 in the blade body 111. It includes an outer peripheral connection portion 113 extending toward the blade body 111 and an end concave portion 114 in which a portion of an edge of the blade body 111 facing the bell mouth 202 is concave.

The blade body 111 is formed to have a curved surface that is curved in the radial direction. As shown in FIG. 7, the radius of curvature (W) of the blade body 111 is preferably within the range of the diameter (D) of the impeller 100 and Equation 1 below.

[Formula 1]

D/14<W<D/10

The inner peripheral extension 112 is formed in the shape of a flat plate, and further includes an inclined edge 115 sloping downward so that the width gradually increases from the end facing the bell mouth 202 to the other end. As shown in FIG. 8, the angle θ of the inclined edge 115 with the end surface 101 is preferably between 90 degrees and 95 degrees.

The outer connecting portion 113 is formed in a plate shape. That is, as shown in FIG. 5, when viewed in a plan view, a straight line is connected between the blade body 111 and the fixing ring 120. It is desirable that the width (X) of the outer connection portion 113 satisfies the radius of curvature (W) of the blade body 111 described above and [Equation 2] below (see FIG. 7).

[Formula 2]

W/22 <

The end concave portion 114 is formed as an 'L' shaped groove. It is desirable that the step (M) and width (L) of the end concave portion 114 satisfy [Equation 3] below (see Figure 8).

[Formula 3]

X/4<M<X/3

M/5<L<M/3

Additionally, the blade 110 is formed to become thicker as it moves inward from the edge facing the bell mouth 202.

That is, based on FIG. 4, the thickness of the blade 110 is thickest in the area adjacent to the central partition 130, and the thickness of the blade 110 becomes thinner toward the end surface 101.

The casing 200 accommodates the impeller 100 and has an overall shape of a cylindrical shape with a gradually increasing radius from the center. A discharge port 201 is formed on the side curved surface 102, and the end surfaces 101 on both sides are formed. A circular bell mouth 202 is formed by opening.

The casing 200 further includes a bell mouth ring portion 210 protruding to surround one end of the blade on an inner peripheral portion in contact with the bell mouth 202.

As shown in FIG. 3, the bell mouth ring portion 210 is formed to surround the top of the blade 110, and the protrusion amount (K) of the bell mouth ring portion 210 is the diameter (B) of the bell mouth 202. ) and [Equation 4] below are satisfied.

[Formula 4]

B/22<K<B/18

The casing 200 is composed of an upper casing (200a) and a lower casing (200b) combined.

Hereinafter, the effects of the blowing fan for air circulation of the present invention will be described.

For comparison, the dimensions are the same and the conventional impeller 100 without the end concave portion 114, the outer peripheral connection portion 113, and the inner peripheral extension portion 112 of the present invention does not have the bell mouth ring portion 210. This was compared with the comparative example provided with the casing (200).

FIG. 9 is the result of flow analysis of the velocity of the fluid in section IX-IX of FIG. 4, and FIG. 10 is the result of flow analysis of the pressure of the fluid in section IX-IX of FIG. 4.

The cross section in FIGS. 9 and 10 is at a height of 30% of the height of the blade upward from the central bulkhead 130.

As shown in Figure 9, in the case of the comparative example, the flow in the upper right corner is unstable, and the flow does not pass well from the blade to the fan case, whereas in the case of the present invention, it can be confirmed that the flow flows out smoothly. .

Additionally, as shown in FIG. 10, it can be seen that relatively high pressure is maintained in the upper right corner of the comparative example. In other words, it can be confirmed that the air introduced through the bell mouth 202 cannot easily escape to the outside of the impeller 100 due to the high pressure at the upper right. On the other hand, in the present invention, the pressure applied to the relevant area is low, so the flow can more easily escape to the outside of the impeller 100.

FIG. 11 is the result of flow analysis of the velocity of the fluid in cross section XI-XI of FIG. 4, and FIG. 12 is the result of flow analysis of the pressure of the fluid in cross section XI-XI of FIG. 4.

The cross section in FIGS. 11 and 12 is at a height of 30% of the height of the blade downward from the central bulkhead 130.

As shown in FIG. 11, in the case of the comparative example, the flow at the bottom was unstable and the flow did not pass well from the blade to the fan case, whereas in the case of the present invention, it can be seen that the flow flows out smoothly.

Additionally, as shown in FIG. 12, it can be confirmed that relatively high pressure is maintained at the bottom right in the comparative example. In other words, it can be confirmed that the air introduced through the bell mouth 202 cannot easily escape to the outside of the impeller 100 due to the high pressure at the bottom right. On the other hand, in the present invention, the pressure applied to the relevant area is low, so the flow can more easily escape to the outside of the impeller 100.

Figure 13 shows the flow of flow passing through the impeller on the side curved surface as a velocity vector.

As can be seen in Figure 13, it can be seen that the present invention is not only distributed evenly up and down, but also flows symmetrically from side to side. In contrast, in the case of the comparative example, the flow is not only discontinuous but also asymmetrical to the left and right.

As described above, the present invention has a low suction and high blowing effect compared to conventional blowing fans for air circulation.

Therefore, the present invention can achieve high airflow volume with low energy.

Additionally, as the flow occurs symmetrically and smoothly, there is also a noise reduction effect.

Although preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately modified within the scope stated in the claims.

100: Impeller 101: End section
102: side curved surface 110: blade
111: Blade body 112: Inner peripheral extension
113: outer connection part 114: end concave part
115: inclined edge 120: fixed ring
200: Casing 201: Discharge port
202: Bellmouth 210: Bellmouth ring part

Claims (10)

An impeller (100) formed of a cylindrical side curved surface (102) and an end surface (101) forming the upper and lower sides of the side curved surface (102) and having a plurality of blades (110) arranged in the circumferential direction;
A bell mouth is formed to surround the impeller 100, has a discharge port 201 disposed on the side curved surface 102, and is opened and disposed on at least one of the end surfaces 101 of the upper and lower surfaces of the impeller 100. Casing (200) including (202); and
A motor coupled to the impeller 100 and rotating the impeller 100;
Includes,
The blade 110 is,
A blade body 111 that is formed in a plate shape and has a curved surface that is curved in the radial direction;
an end concave portion 114 in which a portion of an edge of the blade body 111 facing the bell mouth 202 is concave;
an inner peripheral extension portion 112 extending from the inside of the blade body 111;
A fixing ring 120 surrounding the outside of the plurality of blades 110 and fixing the blades 110; and
It includes an outer peripheral connection portion 113 extending from the blade body 111 toward the fixing ring 120,
The inner peripheral extension 112 is,
It includes an inclined edge 115 sloping downward so that the width gradually widens from the end facing the bell mouth 202 to the other end,
The casing 200 is,
It includes a bell mouth ring portion 210 protruding to surround one end of the blade on an inner peripheral portion in contact with the bell mouth 202,
The width (X) of the outer connection portion 113 satisfies the radius of curvature (W) of the blade body 111 and [Formula 2] below,
The end concave portion 114 is formed as an 'L' shaped groove, and the step (M) and width (L) of the end concave portion 114 satisfy [Equation 3] below,
A blowing fan for air circulation, characterized in that the protrusion amount (K) of the bell mouth ring portion (210) satisfies the relationship between the diameter (B) of the bell mouth (202) and [Equation 4] below.
[Formula 2]
W/22 <
[Formula 3]
X/4<M<X/3
M/5<L<M/3
[Formula 4]
B/22<K<B/18
According to claim 1,
The inner peripheral extension portion 112 is a blowing fan for air circulation, characterized in that it is formed in a flat shape.
According to claim 1,
A blowing fan for air circulation, characterized in that the inclined edge (115) forms an angle with the end surface (101) of 90 degrees or more and 95 degrees or less.
According to claim 1,
The outer connecting portion 113 is a blowing fan for air circulation, characterized in that it is formed in a plate shape.
According to claim 1,
The blade (110) is a blowing fan for air circulation, wherein the blade (110) becomes thicker as it moves inward from the edge facing the bell mouth (202).
The method according to any one of claims 1 to 5,
A blowing fan for air circulation, characterized in that the radius of curvature (W) of the blade body (111) is within the range of the diameter (D) of the impeller (100) and [Formula 1] below.
[Formula 1]
D/14<W<D/10
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