KR20160005420A - Power saving type low-noise fan - Google Patents

Abstract

The present invention relates to a power saving type low noise fan which is able to: increase capacity and decrease electric power at the same time while reducing noise with the additional improvement of a blade; increase capacity while reducing noise by preventing a hunting phenomenon in which wind escaping from a space between blades flows back into a space between an inlet nozzle and an impeller with the improvement of the installation structure of a case and an inlet nozzle; and reduce capacity while reducing noise caused when air flowing into the space between the blades hits the blades when the impeller rotates by a driving motor with the improvement of a connection part between upper and lower plates and the blades. The power saving type low noise fan by the present invention comprises: an impeller which is equipped with a blade of an airfoil form between an upper plate having an air inlet hole formed in the center and a lower plate having a hub combining hole formed in the center and is combined with a hub rotated by a driving motor in the hub combining hole of the lower plate; a case which has the impeller installed therein in order to be able to rotate; an inlet nozzle which is combined to cover the upper plate of the impeller in the front side of the case and guides air to flow to the center of the impeller when the impeller is rotated by the driving motor; and a curved plate shaped blade guide which is included in the inner end part of the blade of the impeller in one united body, is extended to the inside of the air inlet hole of the upper plate, and guides air flowing into the center of the impeller to the blade when the impeller is rotated by the driving motor.

Description

POWER SAVING TYPE LOW-NOISE FAN}

More particularly, the present invention relates to a power-saving low noise blower, and more particularly, to a blower which is capable of reducing noise while improving the air volume while reducing power consumption and improving the installation configuration of the case and inlet nozzle The hunting phenomenon in which the air that has passed through between the blades is re-introduced into the inlet nozzle and the impeller is prevented, the noise can be reduced while the air volume can be increased. Further, by improving the connection portions between the upper and lower plates and the blades, To reduce the noise generated when air impinging between the blades against the blades during rotation of the impeller due to the rotation of the impeller is reduced and at the same time the air volume can be reduced.

Generally, ventilation systems of air conditioners or factory facilities are provided with blowing fans for forcibly blowing air. Such blowing fans can be divided into axial blowing fans and centrifugal blowing fans according to the flow characteristics of the blowing air.

The axial flow type blowing fan is a blowing fan in which the flow of air is generated in parallel with the rotation axis, and the flow rate is large, but the pressure is low. In the centrifugal type blowing fan, the inlet flow of the blade is generated in the direction of the rotation axis, and the outlet flow is generated in the radial direction perpendicular to the rotation axis. In such a centrifugal type blowing fan, the flow rate is small for the purpose of increasing the pressure by centrifugal force. Has high characteristics.

Therefore, in a system including a blowing fan, a blowing fan is applied in consideration of the characteristics of each of the blowing fans. For example, since an indoor unit of an air conditioner requires a high wind pressure, a centrifugal fan An axial flow fan is applied in an indoor unit where a blowing fan is applied and an old wind quantity is required more than a high wind pressure and an axial flow fan capable of realizing a high air flow rate is applied because a ventilation system is intended to discharge a large amount of air in a short time .

Generally, the blowing fan includes an impeller connected to the motor and having a plurality of blades for guiding the flow of air between the upper plate and the lower plate. At this time, a plurality of blades are attached at a vertical inclination angle to discharge the introduced air through the gap between the blade and the blade. Such a blowing fan generates noises and vibrations when the impeller is rotated due to the rotation of the motor to discharge air between the blades and the blades by flowing the air, thereby increasing the power consumption and shortening the life of the motor .

That is, when the air entering between the blades vertically inclined to the upper plate and the lower plate hits against the blade, the air is not smoothly discharged because the blades are generated at the corners.

In order to solve these problems, an impeller for an airfoil-type blower according to Korean Utility Model Registration No. 20-0406815 (published on Mar. 24, 2006), and an impeller for a blower of Korea Patent Registration No. 10-1228994 (Feb. Discloses an impeller for an airfoil-type blower in which a blade provided between an upper plate and a lower plate is formed in the form of an airfoil.

Fig. 1 shows a schematic structural view of such a conventional airfoil-type blower 100. As shown in Fig.

1, a conventional airfoil-type blower 100 includes an upper plate 111 having an air inlet hole 111a formed at the center thereof, a lower plate 113 having a hub coupling hole 113a formed at the center thereof, An impeller 110 having an airfoil-type blade 115 and a hub 117 coupled to a hub coupling hole 113a of the lower plate 113 by a driving motor (not shown) The impeller 110 includes a case 120 in which an impeller 110 is rotatably installed and a case 120 which is coupled to the front of the case 120 so as to cover the top plate 111 of the impeller 110, And an inlet nozzle 130 for guiding air into the center of the impeller 110 when the impeller 110 rotates.

The conventional airfoil type air blower 100 described above includes the impeller 110 having the blade 115 in the form of an airfoil between the top plate 111 and the bottom plate 113, Although the noise caused by the air bending against the blade 15 is reduced to some extent as the air introduced into the blades 115 through the outer circumferential surface of the airfoil-shaped blade is reduced to some extent during the rotation of the impeller 110, There is a problem that the degree of decrease is not large.

The airfoil type air blower 100 according to the related art has a structure in which the outer edge of the inlet nozzle 120 is coupled to the inner side end portion 121 of the upper surface of the case 120 and the gap between the impeller 110 and the inlet nozzle 130 The air introduced into the blades 115 during the rotation of the impeller 110 by the driving motor is again re-introduced through the space between the impeller 110 and the inlet nozzle 130 The hunting phenomenon is generated to increase not only the noise but also the air volume.

The upper and lower ends of the airfoil-type blade 115 are perpendicularly connected to the upper plate 111 and the lower plate 113 so that the impeller 110 The air introduced into the blades 115 during the rotation of the blades 115 collides with the blades 115, doubling the noise and decreasing the air volume.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a power saving type low noise blower in which noise is reduced through addition of blades, Based on the task.

Further, according to the present invention, the hunting phenomenon in which the wind exiting the blade between the inlet nozzle and the impeller is prevented from being prevented by improving the installation structure of the case and the inlet nozzle, so that the noise is reduced while the air volume is increased And a power saving type low noise blower.

In addition, the present invention improves the connection between the upper and lower plates and the blade, thereby reducing the noise generated when the air introduced into the blades during the rotation of the impeller by the driving motor collides with the blades, Reduction type low noise blower.

The above-described object of the present invention is achieved by an airfoil-type blade provided between an upper plate on which an air inlet hole is formed and a lower plate on which a hub coupling hole is formed at the center, and a hub- A case in which the impeller is rotatably installed, a case coupled to cover an upper plate of the impeller in front of the case and air is blown to the impeller when the impeller is rotated by the driving motor, An inlet nozzle which is integrally provided at an inner end of the blade of the impeller and which extends inward of the air inlet hole of the upper plate and which is located at the center of the impeller when the impeller is rotated by the drive motor A power saving type including a curved plate type blade guide for guiding the introduced air to the blade Noise fan.

According to a preferred feature of the present invention, the apparatus further comprises a curved connecting portion formed between the upper end of the blade and the upper plate, and between the lower end of the blade and the lower plate.

According to a further preferred feature of the present invention, the curved connecting portion is also formed between the lower end of the curved plate type blade guide and the lower plate.

According to a preferred feature of the present invention, the upper end inner side end of the case extends into a space between the impeller and the inlet nozzle.

According to a further preferred feature of the present invention, the upper plate and the lower plate have a shape that is lowered and enlarged toward the radially outer side.

According to a further preferred feature of the present invention, the air inlet hole of the upper plate has a larger diameter than the hub coupling hole of the lower plate.

According to a further preferred feature of the present invention, one side of the blade is formed in a plane and the other side of the blade is formed in a convex surface.

According to a further preferred feature of the present invention, the curved plate type blade guide has the same radius of curvature as the other side of the blade formed as a convex surface.

According to the power saving type low noise blower of the present invention, the blade provided between the upper plate and the lower plate is formed in the form of an airfoil, and the curved surface for guiding the air introduced into the air inlet hole of the upper plate to the airfoil- As the plate-shaped blade guide is integrally formed at the inner end of the blade, the noise is further reduced, while the air volume is further increased and the power consumption is also greatly reduced.

Further, according to the power-saving low-noise blower according to the present invention, as the inner end of the upper surface of the case is extended in a space between the impeller and the inlet nozzle, the wind exiting the blade between the impeller and the inlet nozzle is largely blocked from flowing back again between the inlet nozzle and the impeller The noise caused by the hunting phenomenon is reduced while the air volume can be greatly increased.

Further, according to the power saving type low noise blower according to the present invention, a curved connecting portion is formed between the upper end and the upper plate of the airfoil type blade, between the lower end and the lower plate of the airfoil type blade, and between the lower end plate and the lower plate of the curved plate type blade guide The present invention provides a low-noise power-saving blower capable of reducing noise generated when air impinging on a blade is blown between blades when the impeller is rotated by a driving motor, and reducing air volume.

1 is a schematic structural view of a conventional airfoil-type blower;
2 is a power-saving low noise blower according to an embodiment of the present invention.
FIG. 3 is a perspective view of a partially cut-away portion of an impeller in a power-saving low noise blower according to an embodiment of the present invention; FIG.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the connection relationship between the constituent components. The present invention will be described in detail with reference to the accompanying drawings, And this does not mean that the technical idea and scope of the present invention are limited.

The power-saving low-noise blower 1 according to the embodiment of the present invention is applied to, for example, a ventilation system of various air conditioners or factory facilities to forcibly blow air, as shown in FIGS. 2 and 3 An airfoil type blade 15 is provided between an upper plate 11 having an air inlet hole 11a formed at the center thereof and a lower plate 13 having a hub coupling hole 13a formed at the center thereof An impeller 10 to which a hub 17 rotatably driven by a driving motor (not shown) is coupled to the hub coupling hole 13a of the lower plate 13, a case 10 The impeller 10 is mounted on the front side of the case 20 so as to cover the top plate 11 of the impeller 10 so that air is introduced into the center of the impeller 10 when the impeller 10 is rotated by the driving motor. , An inlet nozzle (30) integrally formed at an inner end of the blade (15) of the impeller (10) A curved plate-shaped blade (11) which extends inwardly of the air inlet hole (11a) of the upper plate (11) and guides air introduced into the center of the impeller (10) to the blade (15) when the impeller And includes a guide 40.

Here, the impeller 10 is coupled to the driving motor to generate a suction force for forcibly blowing the air while being rotated. The inlet flow of the blade 15 is in the rotational axis direction, while the outlet flow is in the radial direction perpendicular to the rotational axis And the impeller for the centrifugal blow fan is formed.

The impeller 10 basically has a blade 15 in the form of an airfoil between an upper plate 11 in which an air inlet hole 11a is formed at the center and a lower plate 13 in which a hub coupling hole 13a is formed at the center A plurality of airfoil type impellers for blower. The structure of the impeller for the airfoil-type air blower is already known and will be described in detail, focusing on a different part from the impeller for the airfoil-type air blower.

The upper plate 11 is a portion to which the upper end of the blade 15 is connected and fixed. At the center, an air inlet hole 11a through which air is introduced into the inside of the impeller 10 when the impeller 10 is rotated by the driving motor is formed , And generally has a shape that is downwardly increased and radially outwardly enlarged.

The lower plate 13 is a portion to which the upper end of the blade 15 is connected and fixed and a hub coupling hole 13a through which a hub 17 to be described later is coupled is formed at the center, And has a downwardly descending shape as it goes radially outward. It is preferable that the air inlet hole 11a of the upper plate 11 has a larger diameter than the hub coupling hole 13a of the lower plate 13 so that air can be easily introduced into the inside of the impeller 10 at this time Do.

A curved air discharge path is formed between the top plate 11 and the bottom plate 13 as the top plate 11 and the bottom plate 13 are downwardly moved downward as they are radially outward, The air introduced into the impeller 10 at the time of rotation of the impeller 10 by the motor is blown by the blade 15 with the minimum resistance through the air discharge path formed between the top plate 11 and the bottom plate 13, As shown in Fig.

The blade 15 serves to generate a centrifugal force for inflow and outflow of air at the time of rotation of the impeller 10. Both ends of the blade 15 are connected to the upper plate 11 and the lower plate 13, And the other side surface is formed into a convex surface, and a plurality of airfoil shapes are provided between the top plate 11 and the bottom plate 13 so as to partially form the whirlpool line toward the center. Further, a reinforcing rib (not shown) is provided in the inner space of the airfoil-shaped blade 15. [

Since the blades 15 provided between the top plate 11 and the bottom plate 13 are formed in the form of airfoils, the air introduced into the blades 15 during the rotation of the impeller 10 by the driving motor, The noise due to the air collision is reduced and the blowing air flow rate is increased.

A hub 17 is coupled to the hub coupling hole 13a of the lower plate 13. The hub 17 is a portion directly coupled to a shaft of a driving motor So as to close the hub coupling hole 13a at the center of the lower plate 13. [

The impeller 10 is rotatably installed in a case 20 which forms a housing of a power saving type low noise blower 1 according to an embodiment of the present invention, An outlet is formed in which the impeller 10 is installed and the air introduced into the blades 15 is discharged, and the driving motor may be built in or enclosed according to the embodiment.

A through hole for installing the inlet nozzle 30 is formed on the upper surface of the case 20 and the edge of the through hole, that is, the upper end inner side end 21 of the case 20, It is preferable to extend to the space between the impeller 10 and the inlet nozzle 30 as well.

In this case, the upper end inner side end portion 21 of the case 20 extends into the space between the impeller 10 and the inlet nozzle 30, so that the air that has exited between the blades is re-introduced between the inlet nozzle and the impeller The noise caused by the hunting phenomenon is excluded, resulting in a reduction in the overall range of, for example, 2 to 3 dB, while the air volume is increased by 5% or more.

An inlet nozzle 30 is coupled to the front of the case 20 so as to cover the top plate 11 of the impeller 10. The inlet nozzle 30 is disposed at a position where the impeller 10 rotates by the driving motor The radially outer edge is joined to the upper surface of the case 20 and the middle portion extends obliquely to the upper direction, extends horizontally, and then extends in the downward direction And the radially inner edge is located inside the edge of the air inflow hole 11a of the top plate 11. [ A protective grill may be separately attached to the upper surface of the inlet nozzle 30 according to an embodiment.

The curved plate type blade guide 40 is integrally formed at an inner end portion of the blade 15 of the impeller 10 described above from the inside end of the blade 15 to the top plate 11, The air introduced into the air inlet hole 11a of the impeller 10 at the time of rotation of the impeller 10 by the drive motor is efficiently guided by the blade 15 to the blade 15, It further reduces the noise caused by friction, while increasing the airflow further, thereby reducing power consumption.

The curved plate type blade guide 40 has the same radius of curvature as that of the other side of the blade 15 formed as a convex surface so that air introduced into the center of the impeller 10 can be naturally guided by the blade 15 Or a curved plate continuously formed on the other side of the blade 15 formed as a convex surface.

It is preferable that a curved connecting portion 50 is formed between the upper end of the blade 15 and the upper plate 11 and between the lower end of the blade 15 and the lower plate 13, The upper and lower ends of the foil-shaped blades 15 are connected to the upper plate 11 and the lower plate 13 in a curved curved shape without being perpendicularly connected. The curved connecting portion 50 allows the air introduced into the blade 15 to flow naturally through the curved connecting portion 50, thereby reducing friction of the air to the blade 15, thereby reducing the noise and increasing the airflow further In particular, the inflow air causes an eddy phenomenon in a conventional right-angled connecting portion, thereby causing a noise to be generated, and at the same time, preventing a problem of obstructing the generation of airflow. It is preferable that the curved connecting portion 50 is continuously formed between the lower end of the curved plate-shaped blade guide 40 and the lower plate 13.

In the case of the power saving type low noise blower 1 according to the embodiment of the present invention as described above, the blade 15 provided between the top plate 11 and the bottom plate 13 is formed in the form of an airfoil Since the curved plate type blade guide 40 for guiding the air introduced into the air inlet hole 11a of the top plate 11 to the blade 15 in the form of the airfoil is integrally formed, the noise is further reduced The air volume is further increased and the power consumption can be greatly reduced.

In the case of the power saving type low noise blower 1 according to the embodiment of the present invention as described above, the inner end 21 of the upper surface of the case 20 is formed as a space between the impeller 10 and the inlet nozzle 30, The air blown out between the blades 15 is largely blocked from being re-introduced into the gap between the impeller 10 and the inlet nozzle 30, so that the noise caused by the hunting phenomenon is reduced while the air volume can be greatly increased .

In addition, in the case of the power-saving low noise blower 1 according to the embodiment of the present invention as described above, the airfoil-type blade 15 and the airfoil- 15 and the lower plate 13 and between the lower end of the curved plate-shaped blade guide 40 and the lower plate 13, the blades 50 are formed at the time of rotation of the impeller 10 by the drive motor 15 can be reduced by reducing the amount of air generated by the air bubbled into the blade 15 and reducing the amount of airflow.

As a result of measuring the noise while measuring the noise while rotating the conventional blower having the power-saving low noise blower 1 and the airfoil-type blade according to the embodiment of the present invention at 600 rpm, Table 1 below shows:

The power saving type low noise blower

Conventional blower
noise( dB )
58 dB

62dB
Power consumption (W)
185 W

245 W

As can be seen in Table 1, the power-saving low noise blower 1 according to an embodiment of the present invention has a noise reduction effect of about 4 dB compared with a conventional blower having an airfoil-type blade, The power consumption is also reduced.

1: Power saving low noise blower
10, 110: Impeller
11, 111: upper plate
11a, 111a: air inflow hole
13, 113:
13a, 113a: hub coupling ball
15, 115: blade
17, 117: hub
20, 120: Case
21, 121: upper surface inner end
30, 130: inlet nozzle
40: Curved Plate Blade Guide
100: Conventional airfoil type blower

Claims (8)

An impeller in which an airfoil-shaped blade is provided between an upper plate on which an air inlet hole is formed and a lower plate on which a hub coupling hole is formed at the center, and a hub rotatably driven by a driving motor is coupled to a hub coupling hole of the lower plate;
A case having the impeller rotatably installed therein;
An inlet nozzle coupled to the front of the case so as to cover the top plate of the impeller and guiding air into the center of the impeller when the impeller is rotated by the driving motor; And
And a curved surface that is integrally provided at an inner end of the blade of the impeller and extends inward of the air inlet hole of the upper plate and guides the air introduced into the center of the impeller to the blade when the impeller is rotated by the driving motor Power saving low noise blower with plate blade guide.
The method according to claim 1,
Further comprising a curved connecting portion formed between the upper end of the blade and the upper plate, and between the lower end of the blade and the lower plate, respectively.
The method of claim 2,
Wherein the curved connecting portion is also formed between a lower end of the curved plate type blade guide and the lower plate.
The method according to claim 1,
Wherein the inner end of the upper surface of the case extends into a space between the impeller and the inlet nozzle.
The method according to any one of claims 1 to 4,
Wherein the upper plate and the lower plate have a shape that is lowered downward and enlarged as going radially outward.
The method according to any one of claims 1 to 4,
Wherein the air inlet hole of the upper plate has a larger diameter than the hub coupling hole of the lower plate.
The method according to any one of claims 1 to 4,
Wherein one side of the blade is formed as a flat surface and the other side surface of the blade is formed as a convex surface.
The method of claim 7,
Wherein the curved plate type blade guide has the same radius of curvature as the other side of the blade formed as a convex surface.

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