KR100474337B1 - Impeller structure of sirocco fan - Google Patents

Abstract

The impeller structure of the present invention centrifugal fan has a motor bracket 102 is coupled to one side of the motor 101, the impeller 103 is coupled to the motor shaft protruding outward of the motor bracket 102, the impeller In a centrifugal fan provided with an inlet 105 for sucking air and a scroll housing 104 having a discharge outlet 106 for discharging air, the impeller 103 is formed on the outside of the intermediate plate 201. By installing a relatively high efficiency fan on the inside and a low efficiency fan on the outside, the efficiency of the entire impeller is improved and the noise is reduced.

Description

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

The present invention relates to a centrifugal fan installed in a microwave oven for the hood and to discharge the combustion gas and polluted air generated in the gas stove in a right angle direction, more specifically, to install a turbo fan on the motor side of the centrifugal fan, the opposite side The present invention relates to a structure for forming a discharge port of a centrifugal fan to install a sirocco fan to improve efficiency and reduce noise.

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 the food contained in the cavity C, and at one side of the cavity C, the cooking cavity C The magnetron 10 which radiates a microwave inside the () is provided.

In addition, an air inlet 11 communicating with the exhaust passage 2 is formed at a lower surface of the outer casing 3 at a predetermined interval, and an air outlet 12 for discharging air to the outside is provided at the rear of the upper casing. Formed.

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, 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 two suction centrifugal fan (4) is rotated and the suction force is generated, the outer casing (3) as indicated by the dotted line The combustion gas and the contaminated air are sucked through the air inlet 11 formed at the lower surface of the air inlet, and the sucked air is blown through the exhaust passage 2, and then the air outlet 12 formed at the upper surface of the outer casing 3 is opened. It is discharged to the outside through.

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 perspective 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, despite the different flow path conditions on both sides, the impeller 23 installed on both sides has a plurality of wings 32 formed on both sides of the intermediate plate 31 in a cylindrical shape. Although the same sirocco fan type, there is a problem in that the relative air volume is small on the motor side, reducing the overall efficiency, and generates a large noise.

The object of the present invention devised in view of the above problems is the impeller structure of the centrifugal fan suitable for improving the overall efficiency and reducing the noise by designing the impeller structure on the motor side with a relatively high efficiency structure than the opposite side. In providing.

In order to achieve the object of the present invention as described above, a motor bracket is coupled to one side of the motor, an impeller is coupled to a motor shaft protruding outward of the motor bracket, and the outside of the impeller sucks external air to the inside. In the centrifugal fan provided so as to surround the inlet port and the scroll housing formed with a discharge port in a right direction of the inlet port,

The impeller is installed on the motor side of the middle plate with a relatively small air volume but high efficiency high efficiency fan, high air volume / static pressure fan on the opposite side of the impeller is improved overall efficiency without noise reduction and noise An impeller structure of a centrifugal fan is provided, which is intended to be reduced.

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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 double suction centrifugal fan having an impeller structure according to an embodiment of the present invention, Figure 6 is a perspective view of the impeller according to the present invention, Figure 7 is a side view of FIG.

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 provided with a turbo fan 202 having a relatively low air volume but high efficiency on one side of the intermediate plate 201 having a disc shape, and a sirocco fan 203 having a high air volume / static pressure on the other side. Thus, the overall efficiency is improved without lowering the air volume.

That is, the turbo fan 202 is provided inside the intermediate plate 201 coupled to the motor side, and the sirocco fan 203 is provided on 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.

As described above, when the impeller 103 rotates, the turbo fan 202 installed on the motor side smoothly sucks / discharges the air, so that the other side of the sirocco fan 203 does not deteriorate. Suction / discharge is made so that the overall efficiency of the impeller 103 is improved, and noise is also reduced.

As described in detail above, the impeller structure of the centrifugal fan of the present invention has a relatively efficient turbo fan installed inside the impeller, and a sirocco fan installed outside, thereby reducing air efficiency in the turbo fan installed on the motor side. By inhaling / discharging the efficiency of the entire impeller is effective.

In addition, since the efficiency of the entire impeller is increased as described above, the noise is reduced.

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.

3 is a perspective view of a conventional impeller.

4 is a side view of FIG. 3;

Figure 5 is a perspective view showing a double suction 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 side view of FIG. 6;

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 plate 202: turbo fan

203 Sirocco 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 port for suctioning external air to the outside of the impeller and a discharge port at right angles to the inlet port thereof. In the centrifugal fan is installed so as to surround the scroll housing is formed, The impeller is installed on the motor side of the middle plate with a relatively small air volume but high efficiency high efficiency fan, high air volume / static pressure fan on the opposite side of the impeller is improved overall efficiency without noise reduction and noise Impeller structure of the centrifugal fan characterized in that the reduction.        The impeller structure of claim 1, wherein the high efficiency fan is a turbo fan, and the high air volume / static pressure fan is a sirocco fan.