KR100480105B1 - Impeller structure of centrifugal fan - Google Patents

Abstract

In the impeller structure of the centrifugal fan of the present invention, a ring-shaped intermediate rim 201 is formed at the center, and both wings 202 of the intermediate rim 201 are formed to have a cylindrical shape, and the blade 202 is formed. Ring end fixing rims 203 are formed at both ends of the blades so that the ends of the wings 202 are fixed, and an axial fan 204 is installed at the inner side of the intermediate rim 201 to mix the flow sucked from both sides. When the impeller 103 is rotated, flows introduced from both sides inwardly are discharged by the axial fan 204 toward the opposite side from the motor side, so that the flows discharged from the impeller 103 are discharged from the scroll housing 104. As it is uniformly discharged from the discharge port 106, the noise is significantly reduced than in the case where the flow is concentrated in the center as in the prior art.

Description

Impeller Structure of Centrifugal Fan {IMPELLER STRUCTURE OF CENTRIFUGAL FAN}

The present invention relates to a centrifugal fan installed in a microwave oven and the like to suck the combustion gas and polluted air generated in the gas stove in a right angle direction, more specifically, the suction flow sucked by the wings of the impeller is impeller It relates to an impeller structure of the centrifugal fan to prevent the concentration in the center of the flow to achieve a uniform discharge.

In general, the ODT (over the range) is mainly installed on the upper side of the stove in the kitchen of the home, and uses a microwave cooking function and a ventilation function to inhale / discharge the combustion gas and polluted air generated from the stove. It is a home appliance to perform.

A general form of such a microwave oven is shown in Figure 1, which will be described briefly as follows.

As shown in the drawing, the conventional microwave oven includes a main body (1) having a cavity (C: cavity) for accommodating food to be cooked by microwaves, and surrounding the outside of the main body (1). It is composed of an outer casing (3) coupled to the exhaust passage (2) is formed on both sides and a dual-intake sirocco fan (4) installed on the upper rear of the main body (1) have.

Rotating tray 5 is rotatably installed at the lower side of the cavity C to rotate food contained in the cavity C, and one side of the cavity C radiates microwaves to the inside. The magnetron 10 is provided.

The lower surface of the outer casing 3 is formed with an air inlet 11 communicating with the exhaust passage 2, and an air outlet 12 for discharging air to the outside is formed at the rear of the upper surface.

When microwave oven cooking by microwave in a conventional microwave oven with a hood configured as described above, the user opens the door, put the food on the rotary tray 5 inside the cavity (C), and then press the operation button rotary tray (5) is rotated to rotate the food and at the same time microwave is generated in the magnetron 10 is radiated into the cavity (C) while cooking of the food by the microwave is made.

In addition, in order to discharge the smell and smoke generated when cooking using a gas stove installed on the lower side of the microwave oven, the user presses the hood operation button, in which case the suction suction centrifugal fan (4) is rotated and suction power Is generated and sucked combustion gas and contaminated air through the air inlet 11 formed on the lower surface of the outer casing 3, as indicated by the dotted line, and the sucked air passes through the exhaust passage 2 to the outer casing 3. It is discharged to the air outlet 12 formed on the upper surface.

2 is a front view of a conventional double suction centrifugal fan.

As shown in the drawing, the conventional double suction centrifugal fan 4 has a motor bracket 22 coupled to both sides of a motor 21 provided at a central portion of the motor bracket 22, and An impeller 23 is coupled to a motor shaft (not shown) protruding outward from the center portion, and one side is fixed to the motor bracket 22 and a cylindrical scroll housing is formed to surround the outside of the impeller 23. scroll housing 24 is coupled.

In addition, the scroll housing 24 is formed with an inlet port 25 for sucking air inward and outward, and a discharge port 26 for discharging air sucked in a direction perpendicular to the inlet port 25 is formed. have.

The power suction is applied to the double suction centrifugal fan 4 configured as described above, and when the motor 21 rotates, the impeller 23 stored in the motor 21 rotates, and the rotation of the impeller 23 is performed. The suction force is generated so that the outside air is sucked inwards through both suction ports 25 of the scroll housing 24.

As described above, the air sucked into the scroll housing 24 through the suction port 25 is discharged to the discharge port 26 formed in the perpendicular direction of the suction port 25 by the rotational force of the impeller 23.

Figure 3 is a front view of a conventional impeller, Figure 4 is a side view of FIG.

As shown, the conventional impeller 23 is provided with a plurality of blades (32) at equal angles on both sides of the disk-shaped intermediate plate 31 at equal intervals, the freedom of the wings (32) At the end, a ring-shaped rim 34 supporting the wings 32 is integrally formed.

In the impeller 23 configured as described above, the air sucked into the suction port 25 on the motor side is discharged through the discharge port 26 by the suction force generated by the inner blades 32 when rotating. Air sucked into the suction port 25 on the opposite side by the rotation of the blades 32 is also discharged to the outside through the discharge port 26.

However, in the conventional double suction centrifugal fan 4 as described above, the flow of air sucked from both sides of the impeller 23 by the rotation of the blades 32 when the impeller 23 rotates has the intermediate plate 31. Concentrated in the center portion, the discharged flow is also concentrated in the center portion is discharged flow phenomenon occurs, there was a problem that the noise is severely generated accordingly.

SUMMARY OF THE INVENTION An object of the present invention devised in view of the above problems is to provide an impeller structure of a centrifugal fan suitable for reducing the occurrence of noise by uniformly discharging the flow through the discharge port.

In order to achieve the object of the present invention as described above, a motor bracket is coupled to one side of the motor, and an impeller is coupled to a motor shaft protruding outward of the motor bracket, and the outside of the impeller is configured to suck external air. A centrifugal fan provided so as to surround a scroll housing having a suction port and a discharge port formed in a direction perpendicular to the suction port,

The impeller has a ring-shaped intermediate rim is formed in the center, a plurality of wings are formed in a cylindrical shape on both sides of the intermediate rim, ring-shaped fixing rim is formed on both ends of the wings so that the ends of the wings are fixed The inside of the intermediate rim is provided with an impeller structure of a centrifugal fan, characterized in that an axial flow fan is installed to mix air sucked from both sides.

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Hereinafter, with reference to the embodiment of the accompanying drawings the impeller structure of the present invention centrifugal fan configured as described above in more detail as follows.

5 is a perspective view of a centrifugal fan having an impeller structure according to an embodiment of the present invention, FIG. 6 is a perspective view of an impeller according to the present invention, FIG. 7 is a front view of FIG. 6, and FIG. 7 is a side view of FIG. 6. .

As shown, the two-suction centrifugal fan 100 having an impeller structure according to an embodiment of the present invention, the motor bracket 102 is coupled to both sides of the motor 101, each of the motor bracket 102 The outer side of the impeller 103 for sucking / discharging air is rotatably arranged, one end is fixed to the motor 101 outside the impeller 103 is sucked / discharged by the rotation of the impeller 103 A scroll housing 104 for guiding air is provided to surround the impeller 103.

In addition, the scroll housing 104 is provided with suction ports 105 on both sides for sucking the outside air inwards, and the air sucked into the scroll housing 104 in the perpendicular direction of the suction port 105. The discharge port 106 for discharging the gas to the outside is formed.

The impeller 103 is formed at equal intervals such that a plurality of wings 202 have a cylindrical shape on both sides of the ring-shaped intermediate rim 201, and wings 202 at equal intervals on both ends of the wing 202. A ring-shaped fixing rim 203 for fixing is formed, and inside the intermediate rim 201, an axial flow fan 204 for mixing the flow sucked from both sides is provided.

The axial fan 204 is preferably installed such that the flow is directed from the motor side to the opposite side.

In the double suction centrifugal fan 100 configured as described above, when the power is applied and the motor 101 rotates, the impeller 103 stored in the motor 101 rotates, such as the impeller 103. The suction force is generated by the rotation of the suction force, and the outside air is sucked inward through both suction ports 105 of the scroll housing 104 by the suction force, and sucked into the scroll housing 104 through the suction hole 105. The compressed air is discharged to the discharge port 106 formed in the perpendicular direction of the suction port 105 by the rotational force of the impeller 103.

When the impeller 103 rotates as described above, when the flow of air is sucked into the impeller 103 by the vanes 202, the flow is moved from the motor side to the opposite side by the axial fan 204. Since it is discharged toward the front side, the flow is uniformly discharged through the discharge port 106 of the scroll housing 104 without being concentrated in the central portion of the impeller 103.

Therefore, the noise is significantly reduced as compared to the case where the flow is concentrated in the center of the impeller as in the prior art.

9 is a graph comparing the conventional fan and the fan noise spectrum of the present invention. In the prior art, the noise level was about 59.66 dB (a), but in the present invention, the noise level was about 58.94 dB (a). As can be seen from the entire area of 500 Hz or more it can be seen that the present invention is significantly lower noise than the prior art.

As described in detail above, the impeller structure of the centrifugal fan of the present invention is installed by the axial flow fan inside the central portion of the impeller, so that the flow flowing inward from both sides of the impeller is discharged toward the opposite side from the motor side by the axial flow fan As the flow discharged from the impeller is uniformly discharged from the discharge port of the scroll housing, the noise is significantly reduced than in the case where the flow is concentrated in the center as in the prior art.

1 is a front view schematically showing the structure of a conventional microwave oven with a centrifugal fan installed.

Figure 2 is a front view of a conventional double suction centrifugal fan.

Figure 3 is a side view of a conventional impeller.

4 is a side view of FIG. 3;

5 is a perspective view of a centrifugal fan having an impeller structure according to an embodiment of the present invention.

6 is a perspective view of an impeller according to the present invention.

7 is a front view of FIG. 6;

8 is a side view of FIG. 6;

9 is a fan noise spectrum comparison graph of the conventional fan and the present invention.

Explanation of symbols on the main parts of the drawings

101: motor 102: motor bracket

103 impeller 104 scroll housing

105: suction port 106: discharge port

201: middle forest 202: wings

203: fixed rim 204: axial flow fan

Claims (2)

A motor bracket is coupled to one side of the motor, and an impeller is coupled to a motor shaft protruding outward of the motor bracket, and an inlet for inhaling external air and an outlet formed at right angles of the inlet are formed outside the impeller. In the centrifugal fan provided to surround the provided scroll housing, The impeller has a ring-shaped intermediate rim is formed in the center, a plurality of wings are formed in a cylindrical shape on both sides of the intermediate rim, ring-shaped fixing rim is formed on both ends of the wings so that the ends of the wings are fixed The impeller structure of the centrifugal fan, characterized in that the axial flow fan is installed inside the intermediate rim so that the air sucked from both sides is mixed.        The impeller structure of a centrifugal fan according to claim 1, wherein the axial flow fan is installed so that air flows from the inner end toward the motor of the impeller toward the other end of the outer side.