KR100420519B1 - A multi type blade fan for the refrigerator - Google Patents

Abstract

The present invention relates to a blowing fan installed in the refrigerator of the refrigerator to supply and circulate cold air by driving the motor, and in particular, by improving the structure of the blowing fan, the blowing efficiency can be improved and vibration and noise can be reduced. To a composite fan for a refrigerator.

In the refrigerator composite fan according to the present invention, a refrigerator composite fan is installed at one side of an inner wall of the refrigerator, and is rotated by a drive of a motor in a blower fan for supplying and circulating cold air. Hubs connected to the motor and a plurality of hubs are formed on the circumferential surface of the hub while maintaining a predetermined interval in the circumferential direction, and the blades induce a blowing force when the hub is rotated by the motor. It is characterized in that it comprises a plurality of auxiliary wings to suppress the generation of vortex at the outer end of the wing.

Description

Compound fan for refrigerator {A multi type blade fan for the refrigerator}

The present invention relates to a blowing fan installed in the refrigerator of the refrigerator to supply and circulate cold air by driving the motor, and in particular, by improving the structure of the blowing fan, the blowing efficiency can be improved and vibration and noise can be reduced. To a composite fan for a refrigerator.

1 is a block diagram showing a general refrigerator, Figure 2 is a block diagram of the main portion is installed axial fan according to the prior art.

In general, the refrigerator is provided with a freezing compartment at the upper part and a refrigerating compartment at the lower part of the refrigerator based on the front surface of the main body 2, and supplies the cold air by driving the motor 4 installed at the rear wall of the freezing compartment during the cold air circulation of the freezing compartment. As the axial flow fan 10 rotates, cold air is sucked from the motor 4 side and passes through the axial flow fan 10 and the shroud 6 to the circumferential outlet formed by the grill fan 8. Cold air is discharged, and the grill pan 8 serves to guide the flow passing through the axial fan 10 and the shroud 6 into the freezing compartment.

Here, the cool air flowing into the axial fan 10 is introduced through the suction flow path formed by the motor 4 and the motor support member 9 in front of the axial fan 10, the axial fan 10 ) And along the flow path of the static pressure rise formed by the shroud (6).

3 is a front view showing an axial fan for a refrigerator according to the prior art.

The axial fan according to the prior art has a hub having a rotating shaft formed in the center and connected to the motor, and a plurality of wings are formed while maintaining a certain distance on the circumferential surface of the hub 12 to generate a blowing force while rotating 14 is made to include.

The hub 12 has a circular front face, and the ratio of the outer diameter of the hub 12 to the total outer diameter of the axial fan 10 is referred to as the hub ratio, which is one of important factors for determining the blowing efficiency. It is formed to achieve a ratio of 0.25 ~ 0.3.

The wings 14 are typically made of three to four, the shape is curved on both sides in the direction in which the fan rotates, the side formed in the direction in which the fan is rotated is formed in a concave curve leading edge of the wing At the same time as the 14a, the upper end forms a wing tip portion 14b sharply formed in the circumferential direction.

The surface facing the wing leading edge 14a is formed in a convex curve to form the wing trailing edge 14c and is connected to the blade outer circumference 14d forming a circumferential surface of the fan in a gentle curve.

Figure 4 is a schematic view showing the side of the conventional axial fan for refrigerators, Figure 5 is a side view showing the wings of the conventional axial fan for refrigerators.

The wing 14 is formed such that the wing tip portion 14b is located at the bottom of the circumferential surface of the hub 12, and its position is increased from the circumferential surface of the hub 12 toward the trailing edge portion 14c. A slope is formed to be positioned upwards. At this time, the angle formed by the inclined surface parallel to the circumferential surface of the hub 12 is called the rake angle β.

In addition, the blade is formed concave from the front to the back, the line connecting the end facing in the upward direction is called a cord (CL), the surface parallel to the peripheral surface of the cord (CL) and the hub (12) This angle is called pitch angle (Ψ). Such a pitch angle is usually formed at 25 ° to 35 °.

It is very important that the axial fan 10 is designed so that the noise generated by the axial fan 10 is small in its design, and the design of such an axial fan is a factor which is a standard mentioned above, that is, the hub ratio. , Number of blades, pitch angle (Ψ), sweep angle (θ), rake angle (β), and the like.

It is very difficult to maintain the aerodynamic characteristics of the fan while reducing the noise generated in the axial fan 10, and the theoretical basis for this is not yet established, so as to design the axial fan 10 as described above. Experiments have been made through several trials and errors with the same factors, and it is common to design by selecting the values of the factors that exhibit optimal performance through such experiments.

However, the axial flow fan 10 for refrigerators according to the related art generally has a hub ratio of 0.25 to 0.3, a number of wings 14 to 3 and a pitch angle Ψ of 25 to 35 degrees. Because it is formed in a range, it is difficult to secure a high air flow rate because it does not generate a flow suitable for large pressure loss and complicated flow path characteristics of the refrigerator, and thus there is a limit in improving the freezing and refrigerating performance of the refrigerator, and the outer peripheral portion 14d of the wing and the trailing edge portion ( 14c) there is a big problem due to the noise caused by eddy currents.

In addition, the fluid noise generated by the axial fan 10 according to the related art has a problem that the shielding sound effect of the refrigerator door 7 is less because the low frequency component of 700HZ or less is large.

The present invention has been made to solve the above problems of the prior art, a turbo fan-shaped auxiliary blade is formed at the tip of the blade, and the factors such as the hub ratio, the number of blades, the pitch angle of the blades, rake angle, sweep angle, etc. Is achieved under the optimum conditions, the flow loss, vibration, and noise generated at the tip of the wing are minimized, and the noise generated from the fan is increased in frequency, so the shielding sound effect by the door of the refrigerator is improved, and the amount of blowing air of the fan is improved. An object of the present invention is to provide a combined fan for a refrigerator that can achieve improved high efficiency operation and achieve stable operation with reduced vibration and noise.

1 is a schematic view showing a refrigerator according to the prior art,

2 is a configuration of the main part of a refrigerator provided with an axial flow fan for a refrigerator according to the prior art,

3 is a front view showing an axial flow fan for a refrigerator according to the prior art,

Figure 4 is a schematic view showing the side of the conventional axial flow fan for a refrigerator,

Figure 5 is a side view of the wing of the axial fan for a refrigerator according to the prior art,

6 is a front view showing a composite fan for a refrigerator according to the present invention;

Figure 7 is a side view of the wing of the composite fan for a refrigerator according to the present invention,

8 is a schematic view showing a side of the refrigerator composite fan according to the present invention;

9 is a cross-sectional view taken along the line A-A shown in FIG.

10 is a graph showing the correlation between the hub ratio and the noise generation amount,

11 is a graph showing the correlation between the pitch angle of the wing and the amount of noise generated;

12 is a graph showing the correlation between the maximum camber position and the noise generation amount,

13 is a graph showing the correlation between the sweep angle and the noise generation amount;

14 is a graph showing the correlation between the rake angle and the noise generation amount;

Figure 15 is a graph comparing the noise generation amount of the present invention and the prior art.

<Explanation of symbols on main parts of the drawings>

50: Hub 60: Wings

62: leading edge 64: tip

66: trailing edge 68: outer circumference

70: secondary wing

In the refrigerator composite fan according to the present invention for solving the above problems is installed on one side of the inner wall of the refrigerator, the fan is a refrigerator fan for supplying and circulating cold air as it is rotated by the drive of the motor, the rotating shaft in the center A hub which is formed and connected to the motor, and a plurality of hubs are formed on the circumferential surface of the hub while maintaining a predetermined interval in the circumferential direction, and the blades induce a blowing force when the hub is rotated by the motor, and an outer end of the blade. It is characterized in that it is formed in a plurality of auxiliary wings to suppress the generation of vortex at the outer end of the wing.

Hereinafter, an embodiment of a composite fan for a refrigerator according to the present invention will be described in detail with reference to the accompanying drawings.

6 is a front view showing a composite fan for a refrigerator according to the present invention, Figure 7 is a side view showing the wings of the composite fan for a refrigerator according to the present invention, Figure 8 is a side view of a composite fan for a refrigerator according to the present invention. 9 is a schematic view, and FIG. 9 is a cross-sectional view taken along the line AA of FIG. 6.

The refrigerator according to the present invention includes a cabinet having one side open, an inner case installed on an inner wall of the cabinet to form an interior chamber, and a door installed on an open side of the cabinet to open and close the refrigerator.

Generally, a freezer compartment with a relatively small space is arranged at the upper part of the cabinet, and a refrigerating chamber with a relatively large space is disposed at the lower part of the cabinet compared to the freezer compartment, so that the inner wall of each chamber can maintain the internal air below a predetermined temperature. A heat exchanger is installed, and a blower for forcibly flowing the air in the refrigerator is installed so that the air in the refrigerator can be converted to a low temperature while passing through the heat exchanger.

The blower includes a motor installed on an inner wall of the cabinet and a combined fan for a refrigerator connected to the rotating shaft of the motor.

Here, the composite fan for a refrigerator according to the present invention has a rotating shaft formed in the center, as shown in Figure 6, the hub 50 is connected to the motor and driven, a plurality of constant on the peripheral surface of the hub 50 It is integrally formed while maintaining the spacing is made to include a wing (60) for generating a blowing force while driving with the hub (50).

The hub 50 is formed in a circular front shape and has a hub ratio representing a ratio of the total outer diameter of the composite fan including the wings 60 and the outer diameter of the hub 50 to 0.45, and is connected to the motor. .

The number of the wings 60 is formed in the number of nine or more, the shape of the both sides form a curved curve in the direction in which the fan rotates, the side formed in the direction in which the fan rotates is formed in a concave curve before the wings Simultaneously with the edge 62, the upper end forms a wing tip 64 formed in the circumferential direction.

In addition, the surface facing the wing leading edge 62 is formed in a convex curve to form a wing trailing edge 66, and is formed to be connected to the blade outer peripheral portion 68 forming a circumferential surface of the fan in a gentle curve.

In addition, the wing 60 is formed so that the wing tip 64 is located at the rearmost from the circumferential surface of the hub 50, as shown in Figure 8, the position toward the trailing edge 66 An inclination is formed to be located forward from the circumferential surface of the hub 50. The angle between the inclination and the horizontal surface of the hub is referred to as a rake angle β, and is formed concave to the rear.

It is very important that the axial fan is designed so that the noise generated in the axial fan is small in the design thereof, and the design of the axial fan such as the hub ratio, the blade 60 of There are factors such as the number, the pitch angle Ψ of the blades 60, the sweep angle θ, the rake angle β, and the like.

Here, the pitch angle (Ψ) of the blade 60 is a cord (chord: CL) is a straight line connecting both ends of the front of the fan toward the negative pressure surface in the cross section of the blade (CL) and the hub of the Refers to an angle formed with a horizontal line extending from the circumferential surface, the composite fan for a refrigerator according to the present invention consists of 35 ° ± 1 ° at the outer peripheral portion 68 of the blade, 45 ° ± 1 ° at the hub side end of the blade The ends are formed to be connected in a streamlined smooth curve.

The sweep angle θ is a factor representing an angle in which the wing 60 cord CL is inclined in a positive circumferential direction along a radial direction, and is formed to form 24 ° to 26 °.

The rake angle β is a factor indicating the degree of inclination of the blade in the positive axial direction, as shown in Figure 8, the composite fan for a refrigerator according to the present invention is formed to achieve -3 °.

In addition, the blade 60 has a maximum camber position (MCP) of 0.65 when the outer peripheral portion 64 of the blade 60 is assumed to be 1 and the hub side end of the blade is 0 as shown in FIG. 7. The maximum camber rate, which is a percentage of the maximum camber MC and the cord length CL, is formed to be 7% at the outer circumferential portion 64 of the wing and 5% at the wing hub side end.

As a result, the blade 60 reduces the fluid noise generated from the fan itself, so that the blade passing frequency (BPF) is more than doubled, so that most vibrations and noise are blocked by the high frequency blocking effect of the refrigerator door. It could be.

In addition, the outer peripheral portion 68 of the blade 60 is formed with a turbo fan-shaped auxiliary blade 70 to suppress the generation of the vortex (Vortex Shedding) at the end of the blade 60 during driving to reduce the blowing efficiency To prevent it.

The auxiliary vane 70 is referred to as the inlet angle of the angle of the velocity vector of the air flowing in when viewed from the coordinate system on the turbofan with the circumferential tangent at the position, and the velocity vector of the discharged air is the tangential tangent at the position. The forming angle is called an exit angle. The inlet angle is designed to be 110 ° ± 1 ° and the exit angle is 120 ° ± 1 °, and the height of the blade is formed to have a distribution of 0.2 ~ 0.3 times the diameter of the axial fan.

And, as shown in FIG. 9, the blade 60 has a curved portion having a radius of 0.1 times or less of the fan diameter so that the positive pressure recovery of the air passing from the pressure surface to the negative pressure surface may slowly occur on the tip portion 64 ( 69 is formed to suppress the generation of leakage vortex generated in the outer peripheral portion 68 and the trailing edge portion 66 of the wing (60).

Structural characteristics of the composite fan for a refrigerator according to the present invention described above are numerical values determined by repeated experiments, which are visually shown as attached graphs from FIG. 10 to FIG. 15, and FIG. Figure 11 is a graph showing the correlation between the pitch angle of the blades and the noise generation amount, Figure 12 is a graph showing the correlation between the maximum camber position and the noise generation amount, Figure 13 is a sweep angle and the noise generation amount A graph showing the correlation between and, and FIG. 14 is a graph showing the correlation between the rake angle and the noise generation amount.

In addition, Figure 15 is a graph comparing the noise generated in the conventional axial flow fan for refrigerators and the refrigerator for the composite fan according to the present invention including the factors described above, 4.9 으로 reduction based on the front blowing noise of the refrigerator It became.

Looking at the action of the composite fan for a refrigerator according to the present invention configured as described above are as follows.

First, when power is applied and the refrigerator is operated, the temperature in the refrigerator is maintained at a temperature lower than a predetermined temperature by the state of the refrigerant compressed by the compressor, which is a flow of air circulating in the refrigerator as the composite fan for the refrigerator is driven to pass through the heat exchanger. By creating it.

In this case, the refrigerator fan is a pitch angle, a hub ratio, a rake angle, a sweep angle, etc. of the wing 60 is formed as described above, and the auxiliary blade of the turbo fan shape on the outer peripheral portion 68 of the wing 60 ( 70) is formed to increase the air flow rate, suppress the generation of vortex or vortex in the outer peripheral portion 68 and the trailing edge portion 66 of the wing can achieve a stable operation with reduced noise, driving with improved efficiency Can be.

The composite fan for a refrigerator according to the present invention configured as described above is formed such that the number of wings is 9, the pitch angle of the wings is 35 ° ± 1 ° at the outer circumference, and 45 ° ± 1 ° at the hub side end, and the maximum camber position is Where the maximum camber rate is 7% at the outer periphery of the wing, 5% at the hub end, and the hub ratio is 0.45, and the sweep angle is formed between 24 ° and 26 ° and the rake angle is -3 Designed at °, the outer periphery of the blade is formed with a turbo fan-shaped auxiliary blade, the curved portion 69 is formed at the tip portion, thereby suppressing the vortex discharge or the generation of vortex at the outer periphery, the tip portion, the trailing edge of the blade This has the advantage of achieving stable operation with improved noise and vibration reduction.

Claims (9)

In the refrigerator blower fan is installed on one side of the inner wall of the refrigerator for supplying and circulating cold air as it is rotated by the drive of the motor; A hub having a rotation shaft formed in the center thereof and connected to the motor; A plurality of wings are formed on the circumferential surface of the hub while maintaining a predetermined interval in the circumferential direction and causing the blowing force when the hub is rotated by the motor; It is formed on the outer end of the wing composite fan for a refrigerator, characterized in that it comprises a plurality of auxiliary wings to suppress the generation of vortex at the outer end of the wing. The method of claim 1, The hub is a composite fan for a refrigerator, characterized in that the hub ratio representing the ratio of the total diameter of the fan and the diameter of the hub is 0.45. The method of claim 1, The blade is formed of nine or more, the pitch angle representing the angle formed by the cord of the blade and the radial plane of the fan is 35 ° ± 1 ° at the outer peripheral portion of the blade, 45 ° ± 1 ° at the hub side end of the blade Composite fan for refrigerator, characterized in that. The method of claim 1, The wing is a composite fan for a refrigerator, characterized in that the sweep angle is 24 ° ~ 26 ° indicating the angle of the wing cord in the positive circumferential direction along the radial direction. The method of claim 1, The blade is a composite fan for a refrigerator, characterized in that the rake angle is -3 ° indicating the angle of the wing inclined in the axial direction in which air is blown. The method of claim 1, Said wing is the outer periphery of a wing is 1, and when the hub side edge part of a wing is 0, the maximum camber position is 0.65 characterized by the above-mentioned. The method of claim 1, And the blade has a maximum camber ratio, which is a percentage of the maximum camber and the cord length, at 7% at the outer circumference of the wing and 5% at the hub side end of the wing. The method of claim 1, The blade is a composite fan for a refrigerator, characterized in that the curved portion having a radius of 0.1 times the diameter of the fan at the outer end to suppress the generation of vortex at the outer end of the blade. The method of claim 1, The auxiliary wing is formed in the shape of a turbo fan, the inlet angle is 110 ° ± 1 °, the outlet angle is a composite fan for a refrigerator, characterized in that 120 ° ± 1 °.