KR101199063B1 - Centrifugal fan and refrigerator hanving the same - Google Patents

Abstract

The present invention relates to a centrifugal fan and a refrigerator using the same. The centrifugal fan according to the present embodiment includes a rotating plate having a hub connected to a driving means and rotating; A plurality of blades disposed radially on the rotating plate; The shroud is formed at a position opposite to the rotating plate, and includes a shroud connecting the plurality of wing feathers. The wing feather has an upper portion connected to the shroud toward a rotation direction of the rotating plate, and a lower portion connected to the rotating plate. It is characterized in that it is formed to be inclined to face the opposite direction of rotation of the rotating plate.

Description

Centrifugal fan and refrigerator including same {Centrifugal fan and refrigerator hanving the same}

The present embodiment relates to a centrifugal fan and a refrigerator including the same.

In general, centrifugal fans are used for various purposes as machines that send air from the inside to the circumferential direction by centrifugal force. Such centrifugal fans are also used in air conditioners and refrigerators. In particular, when applied to home appliances such as refrigerators, centrifugal fans have been developed to improve noise due to their high sensitivity to noise.

Noise generated from the centrifugal fan can be roughly classified into harmonic noise and broadband noise depending on the frequency characteristics. Harmonic noise can be subdivided into noise caused by the normal components that do not change over time and the abnormal noise caused by the influx of the influx of the fan on the surface of the rotating vane. . Collectively, this is called wing pass frequency noise.

In addition, broadband noise is generated by the interaction between the incident broadband noise caused by the interaction between the turbulent components in the fluid entering the fan and the front and rear of the wing, and the interaction between the turbulent and the trailing edge in the boundary layer on the wing. It is roughly classified as broadband noise.

In the case of a centrifugal fan, the total radiation noise that can be controlled through its own design is mainly due to the wing passing frequency noise caused by the interaction between the fluid discharged from the wing and the volute tongue area, and the turbulence in the boundary layer on the wing. Autonomous broadband noise is usually caused by interactions behind the wing.

Accordingly, various efforts have been made to develop a low noise centrifugal fan having a relatively simple configuration while maintaining the existing air volume based on such a noise generating mechanism.

An object of the present embodiment is to provide a centrifugal fan and a refrigerator including the same, which can reduce the noise generated when the centrifugal fan rotates by causing a phase difference in the noise source generated from the vane.

Centrifugal fan according to the present embodiment, the rotating plate is provided with a hub connected to the driving means; A plurality of blades disposed radially on the rotating plate; The shroud is formed at a position opposite to the rotating plate, and includes a shroud connecting the plurality of wing feathers. The wing feather has an upper portion connected to the shroud toward a rotation direction of the rotating plate, and a lower portion connected to the rotating plate. It is characterized in that it is formed to be inclined to face the opposite direction of rotation of the rotating plate.

In addition, the inclined portion of the blade is characterized in that it is formed from the center portion of the blade to the back of the blade.

In addition, the inclined portion of the blade is characterized in that the horizontal distance between the top and the lower end toward the rear of the blade.

In addition, the front edge of the blade is characterized in that the upper and lower ends are formed on the same extension line.

In addition, the end of the front edge of the wing feathers is characterized in that the curved wave portion is characterized in that it is bent round to face the direction of rotation of the rotating plate.

In addition, before the wing feather, the first wave portion is formed on the shroud side, and has a curvature protruding in a direction opposite to the rotation direction, and is formed on the rotation plate side, protruding in the same direction as the rotation direction of the rotation plate A second wave portion having a curvature is formed.

In addition, the curvature of the second wave portion is formed larger than the curvature of the first wave portion.

In addition, the refrigerator according to the present embodiment is characterized by including the centrifugal fan.

According to the proposed embodiment, the centrifugal fan according to the present embodiment can reduce the noise emitted by forming the inclined portion and the wave portion in the vane without adding a separate configuration.

Therefore, a separate configuration is not added to the centrifugal fan to maintain a concise configuration and to reduce noise by only changing the shape of the vane. This can be expected to reduce the production cost as well as the noise reduction effect.

1 is a perspective view of the centrifugal fan according to the present embodiment from above.
2 is a perspective view of the centrifugal fan viewed from below.
Figure 3 is a cross-sectional view showing a cross-sectional shape of the blade feather of the centrifugal fan according to the present embodiment.
Figure 4 is a partial perspective view showing the appearance of the blade.
5 is a graph comparing the rotation speed and the air volume according to the input voltage.
6 is a graph comparing the noise level according to the rotation speed.
7A and 7B are graphs comparing acoustic power level spectra of an ice pan alone section when a centrifugal fan according to an embodiment of the present invention is applied to an ice pan of a refrigerator.
8 is a schematic view showing a state in which the centrifugal fan is applied to a refrigerator.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other embodiments included within the scope of other inventive inventions or the scope of the present invention can be easily made by adding, changing, or deleting other elements. I can suggest.

1 is a perspective view of the centrifugal fan according to the present embodiment from above. 2 is a perspective view of the centrifugal fan viewed from below.

1 and 2, the centrifugal fan 100 according to the embodiment of the present invention includes a rotating plate 110 having a hub 112 connected to a rotating shaft of a driving motor, and a plurality of rotating plates 110. The wing feather 200 is provided, and the shroud 120 for connecting the plurality of wing feathers 200.

In detail, the rotating plate 110 is formed in a disc shape, and the hub 112 is formed at an approximately central portion thereof. The hub 112 is formed to protrude from the center of the rotating plate 110, is formed integrally with the rotating plate 110 is configured to rotate the rotating plate 110. To this end, a connection boss 114 connected to the rotating shaft of the driving motor may be formed at the center of the hub 112.

In addition, the hub 112 is formed so that the diameter becomes wider from the top to the bottom to facilitate the movement of air during the movement of the rotating plate (110). In detail, the hub 112 may be formed in a dome shape that widens downward. Therefore, the sucked air may be guided to the wing feather 200 side along the outer curved surface of the dome-shaped hub 112.

The wing feather 200 is formed in the outward direction from the center of the rotating plate 110, a plurality of wing feathers 200 are arranged in succession to have a predetermined interval radially. The blade 200 may be composed of about 10, a portion of the blade 200 may be formed to protrude to the outer side of the rotating plate (110). Detailed shape and structure of the blade 200 will be described again below.

The shroud 120 is formed to prevent vibration when the plurality of blades 200 mounted on the rotating plate 110 to rotate, and guide the sucked air. In detail, the shroud 120 is formed in a ring shape and is formed at a position opposite to the rotating plate 110. The shroud 120 is formed to connect outer edge portions of the plurality of wings 200.

In addition, the shroud 120 connects the plurality of wings 200, a guide portion 122 having a predetermined width, and a guide for guiding the air sucked vertically from the end of the connection portion 122. It may be composed of a portion 124.

Therefore, the plurality of blades are connected by the connecting portion 122 when the rotating plate 110 is rotated to prevent the vibration of the blades 200, and through the guide portion 124 of the centrifugal fan 100 It can be guided so that air can be introduced into the inside.

On the other hand, the opened portion of the center of the shroud 120 formed in the guide portion 124 of the shroud 120 is the inlet 130 through which air is sucked. In addition, the space between the plurality of blades 200, the rotating plate 110, and the shroud 120 becomes a discharge port 140 through which the sucked air is discharged.

Therefore, when the centrifugal fan 100 rotates, air is sucked into the centrifugal fan 100 through the suction port 130 in the center of the shroud 120, and the sucked air is the plurality of wings 200. It is discharged outward through the discharge port 140 between.

Figure 3 is a cross-sectional view showing a cross-sectional shape of the blade feather of the centrifugal fan according to the present embodiment. And, Figure 4 is a partial perspective view showing the appearance of the blade.

Referring to FIGS. 3 and 4, the wing feather 200 extends from one side of the rotor plate 110 in the outward direction of the rotor plate 110, and the center portion of the wing blade 200 is approximately the center of the centrifugal fan 100. Is formed to protrude in the same direction as the rotation direction of.

The airfoil (Airfoil) shape of the blade 200 is formed larger than the curvature of the front surface. In order to compensate for the flow rate reduction that may be caused by the phase difference in the wing feather 200, the camber of the airfoil is increased to increase the lift coefficient at the same angle of attack as the general centrifugal fan 100. Is formed.

In addition, the wing feather 200 is disposed so that the front edge 210 faces the center of the rotating plate 110, the rear edge 220 toward the outside of the rotating plate 110. At this time, the rear edge 220 of the blade 200 is protruded to the outside of the rotating plate 110, is formed to be bent in a direction opposite to the rotation direction of the centrifugal fan (100).

On the other hand, the blade 200 is formed to be inclined so that the upper end 230 is connected to the shroud 120 is more protruded than the lower end 240 is connected to the rotating plate 110. At this time, the upper end of the blade 200 is formed to protrude in the same direction as the rotation direction of the rotating plate (110). Therefore, the lower end of the blade 200 is relatively facing the direction of rotation of the rotating plate 110.

The wing feather 200 may be formed to be inclined from an approximately center portion in the horizontal direction of the wing feather 200, and may be formed to be inclined from the front edge 210 of the wing feather 200 as necessary. When the wing feather 200 is inclined past the front blade 210 of the blade feather 200, the front blade 210 of the blade feather 200 is inclined with the upper end 230 and the lower end 240 positioned on the same extension line. It may be formed so as not to support.

In addition, the inclined portion of the wing feather 200 may be formed such that the distance between the upper end 230 and the lower end 240 of the wing feather 200 toward the rear edge 220 of the wing feather 200. That is, the wing feather 200 may be formed to be inclined toward the rear edge 220 of the wing feather 200 from the side closer to the center of the rotating plate 110. At this time, the rear edge 220 of the blade 200 may be formed to have an inclination angle of approximately 5 ~ 10 ° with the rotation axis of the rotating plate (110).

On the other hand, a wave unit 250 is formed in the blade 200. The wave unit 250 is formed to be bent in a direction opposite to the rotational direction of the centrifugal fan 100 at the rear front edge of the blade feather (200). In addition, the wave unit 250 induces disturbance by the interaction between the turbulence generated at the rear end 220 of the wing feather 200 and the rear edge 220 of the wing feather 200.

In detail, the wave part 250 is formed at the lower end of the wing feather 200 in contact with the rotating plate 110. In addition, the wave part 250 is formed at the lower edge of the wing feather 200 protruding to the outside of the rotating plate 110. At this time, the wave unit 250 may be bent to have an inclination angle of approximately 5 ~ 10 °.

In addition, the wave part 250 may be bent from an approximately center of the rear edge 220 of the wing feather 200, and may be bent from a portion protruding outward from the rotating plate 110 at the bottom of the wing feather 200. Can be formed.

Meanwhile, a first wave part 222 and a second wave part 224 may be formed at the rear edge 220 of the wing feather 200. The trailing edge of the blade 200 is formed by the first wave portion 222 and the second wave portion 224, the first wave portion 222 and the second wave portion 224 are opposed to each other It may be formed to protrude round in the direction. In addition, the first wave unit 222 and the second wave unit 224 may be started from the center of the back of the wing feather 200.

In detail, the first wave unit 222 is formed over the upper end of the wing feather 200 in contact with the shroud 120 from the center of the back front of the wing feather 200. Then, it is formed to be round so that the central portion protrudes in the direction opposite to the rotation direction of the centrifugal fan 100.

In addition, the second wave part 224 may be formed over the lower end of the wing feather 200 in contact with the rotating plate 110 from the center of the back front of the wing feather 200. In addition, the center portion may be rounded to protrude in the same direction as the rotational direction of the centrifugal fan 100.

The first wave unit 222 and the second wave unit 224 may be formed to protrude differently, and the curvature of the first wave unit 222 and the second wave unit 224 may also be formed differently. have. In this case, the curvature of the first wave portion 222 may be formed smaller than the curvature of the second wave portion 224.

Hereinafter, the operation of the refrigerator according to the present embodiment having the configuration as described above will be described.

The drive motor is operated to drive the centrifugal fan 100. The rotating plate 110 connected to the rotation shaft of the drive motor is rotated by the rotation of the drive motor to rotate the centrifugal fan 100.

When the centrifugal fan 100 rotates, the pressure in the center of the centrifugal fan 100 is lowered so that the air passes through the shroud 120 by the pressure difference with the outside of the centrifugal fan 100. Inhaled into the center.

The air sucked into the center of the centrifugal fan 100 is pushed toward the negative pressure surface side of the blade 200 by the rotational force of the blade 200 arranged on the rotating plate 110, the negative pressure of the blade 200 The air pushed toward the surface side receives a force in a direction perpendicular to the pressure surface of the wing feather 200 inclined to a predetermined angle between the rotating plate 110 and the shroud 120. And, the air received in the vertical direction is discharged through the discharge port 140 formed by the blade feather 200, the rotating plate and the shroud 120.

On the other hand, turbulence on the airfoil generated by the rotation of the blade 200 will generate self-bandwidth noise. The wave shape of the wing feather 200 intervenes in the noise generating mechanism to flow the phase difference of the turbulence generation, and induces the phase difference between the noise sources on the wing feather 200 to reduce noise.

That is, the noise source due to the turbulence in the boundary layer generated by the rotational force of the blade 200 and the turbulence generated at the rear 220 of the blade 200 is phase difference due to the wave shape of the blade 220 before the blade 200 Is induced to act to reduce self-bandwidth noise.

In addition, the slanted shape of the front edge 220 behind the blade 200 is also generated by the interaction between the air discharged from the blade 200 and the volute tongue region through the noise generating mechanism. By reducing the phase difference of the noise is reduced.

That is, due to the influence of the unstable air flow discharged from the blade 200 and the interaction of the volute tongue region with the inclination of the trailing blade 220 behind the inclined blade 200, a phase difference of noise is generated, thereby making harmonious noise. Will be reduced.

In addition, the thickness becomes thinner toward the rear edge of the wing feather 200, the trailing edge 220 of the wing feather 200 is minimized to induce a reduction in vortex deviation caused by the trailing edge 220 of the wing feather 200 The effect is to reduce broadband noise.

5 is a graph comparing the rotation speed and the air volume according to the input voltage.

Referring to Figure 5, it can be seen that the inclination of the rotational speed and the amount of air according to the input voltage of the existing centrifugal fan and the inclination of the rotational speed and the amount of air according to the input voltage of the centrifugal fan 100 according to this embodiment is almost the same. have.

Therefore, it can be seen that the number of rotations and the amount of air according to the input voltage according to the present embodiment have characteristics equivalent to those of the existing centrifugal fan. That is, it can be seen that the air volume of the centrifugal fan 100 according to the present embodiment is not reduced.

6 is a graph comparing the noise level according to the rotation speed.

Looking at the change in the sound pressure level (sound pressure level) at a position 1m away from the back of the refrigerator with reference to Figure 6, the rear noise of the centrifugal fan 100 according to the present embodiment as compared to the rear noise of the conventional centrifugal fan is lowered as a whole It can be seen that. In particular, it can be seen that there is an improvement effect of approximately 3.6 dB (A) in the 2130 ~ 2150rpm, the main rotational operation region in which the centrifugal fan 100 of the refrigerator operates.

7A and 7B are graphs comparing acoustic power level spectra of an ice pan alone section when a centrifugal fan according to an embodiment of the present invention is applied to an ice pan of a refrigerator.

FIG. 7A is a graph showing sound power levels in a single section of a conventional refrigerator ice pan, and FIG. 7B is a graph showing sound power levels in a single section of a refrigerator ice pan according to the present embodiment.

7A and 7B, when comparing the sound power level in the section in which the ice fan is operated alone in the refrigerator, the sound power level of the ice fan employing the centrifugal fan 100 according to the present embodiment is low. It can be seen that the numerical value is recorded, and the improvement effect is approximately 2.5 dB (A) compared to the existing fan.

8 is a schematic view showing a state in which the centrifugal fan is applied to a refrigerator.

Referring to FIG. 8, the centrifugal fan 100 according to the present embodiment may be provided in a heat exchange space 12 formed in the cabinet 10 of the refrigerator 1, and is driven by the centrifugal fan 100. The cold air generated in the evaporator of the heat exchange space 12 is configured to be supplied to the ice maker 16 through the cold air duct 14.

Of course, the centrifugal fan 100 according to the present embodiment, in addition to a fan for supplying cold air to the ice maker 16, a fan for cooling cold air to a freezer compartment or a refrigerating compartment or a fan for cooling a specific space (1). It can be used as another fan provided in the.

100. Centrifugal fan 110. Swivel plate
120. Shroud 200. Wings
210.Before 220
222. First wave part 224. Second wave part
230.top 240.bottom
250. Waves

Claims (8)

A disk-shaped rotating plate provided with a hub connected to the driving means and rotating;
It is formed in a position opposite to the rotating plate, and comprises a shroud formed in a circular ring shape,
A plurality of radially disposed between the rotating plate and the shroud, the upper portion connected to the shroud is inclined toward the rotation direction of the rotating plate, the lower portion connected to the rotating plate is inclined toward the rotation opposite direction of the rotating plate. Wing feathers; And
It is formed in front of the blade, the wave portion is formed to be bent round to face the direction opposite to the rotation direction of the rotating plate;
The rotating plate is formed so as to have a radius smaller than the outer end of the blade, the centrifugal fan, characterized in that the wave portion is disposed on the outside of the rotating plate. The method of claim 1,
The inclined portion of the blade feather is a centrifugal fan, characterized in that formed from the center of the blade feather to the back of the blade feather. The method of claim 1,
The inclined portion of the wing feather is a centrifugal fan, characterized in that the horizontal distance between the top and bottom toward the rear of the wing feather is formed far. The method of claim 1,
Centrifugal fan, characterized in that the front edge of the blade is formed so that the upper end and the lower end on the same extension line. delete The method of claim 1,
The wave unit,
A first wave portion in contact with the shroud and having a curvature protruding in a direction opposite to the direction of rotation;
A centrifugal fan comprising a second wave portion contacting the rotating plate side from below the first wave portion, the second wave portion having a curvature protruding in the same direction as the rotation direction of the rotary plate. The method according to claim 6,
Centrifugal fan, characterized in that the curvature of the second wave portion is formed larger than the curvature of the first wave portion. The refrigerator provided with the centrifugal fan of any one of Claims 1, 2, 3, 4, and 6.

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