JP2007231890A - Centrifugal fan motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal fan motor having symmetrical air suction ports on both faces of a motor outer frame and a discharge port on one side face in the perpendicular direction to the air suction port and capable of reducing noise and suppressing reduction of air quantity. <P>SOLUTION: The center 4b of rotation of a vane of a rotor is arranged by deviating it in the direction for letting the center 4b leave the discharge port 6 relative to the center 4a of circular suction diameter provided in the motor outer frame 1. Area of a suction part in a part where pressure is positive and high is reduced, and area of a suction part in a part where pressure is negative and low is increased to reduce noise or increase air quantity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a centrifugal fan motor in which suction ports on both sides of a motor outer frame are optimized to reduce noise and air volume reduction.

In a fan motor, it is an important issue to prevent noise and air volume reduction regardless of type. This is because, depending on the installation position of the fan motor, a performance for maintaining the air volume while avoiding noise is required. The same applies to the centrifugal fan motor.
There are two types of hyperopia fan motors: single-sided suction type and double-sided suction type motors. Each type has unique suction characteristics and discharge characteristics, and it is important to take measures in consideration of these characteristics.

Patent Document 1 shows a conventional example in which noise reduction and air volume reduction prevention are applied to a single-sided suction type sirocco fan.
This is a sirocco-type heat dissipator equipped with a sirocco-type fan and a sirocco-type heat dissipator module. , Increase emissions.
This single-sided suction type has a characteristic that the vicinity of the suction port on the discharge port side is a high pressure area, and in order to solve this, a blocking plate is provided in that part so that the suction shape is not made circular. is there.
Japanese Patent Laid-Open No. 2003-3998

FIG. 7 shows an example of a conventional double-sided suction type centrifugal fan motor.
A circular suction port 22 is formed in the approximate center of the outer frame 21, and a similar suction port is also provided on the back side.
The center of the suction port 22 and the center of the blade coincide with each other, and the blade diameter 24 is configured to be larger than the suction diameter 25.
FIG. 8 shows the measured pressure distribution of the suction port on the rotor side and the stay side for this centrifugal fan motor.

  In FIGS. 8A and 8D, the positive and negative pressures are expressed by the color density grounds on the rotor side and the stay side. These (a) and (d) are described in black and white grounds. However, the color is not clear, but the more positive the pressure is, the deeper the red color is, and the lower the pressure is, the darker the blue color is. It becomes darker). (B), (e) is a pressure distribution meter, which shows a state where the blue color is darker toward the left negative pressure side and the red color is darker toward the right positive pressure side. (C) is a plan view on the rotor side and corresponds to (a), and (f) is a plan view on the stay side and corresponds to (d).

The pressure distribution at the rotor side suction port will be described with reference to FIGS. 8A and 8C.
In the vicinity of the edge above the center of the suction aperture of (a), red island-shaped portions 31 are distributed, indicating that the pressure is extremely high. On the other hand, a blue solid portion 32 is continuous on the edge below the center of the suction port diameter, indicating that the pressure is extremely low. A constant size portion 33 in the center of the suction aperture is a motor portion, and the portion where no suction is performed is a normal dark red color.
In addition, the portion 34 between the portion 33 and the edge of the suction aperture is a portion with a lot of light red, yellow, and light blue, and is a normal pressure rather than a portion where the pressure is particularly high or low. Further, the outer portion 35 slightly separated from the edge portion of the suction port is a dark red color in a portion where the suction port of the outer frame is not formed.

Next, the pressure distribution in the stay side suction port will be described with reference to (d) and (f).
On the stay side, the tendency of pressure distribution in the rotor side suction port is substantially the same. In the vicinity of the edge above the center of the suction port diameter of (d), a red island-shaped portion 37 (a little less redness than the rotor side) is distributed, indicating that the pressure is extremely high. On the other hand, a solid portion 38 that is slightly thinner in blue is connected to the edge below the center of the suction port diameter, indicating that the pressure is extremely low. A constant size portion 39 at the center of the suction port diameter is a portion of the motor portion where no suction is performed, and is a normal dark red color. A portion 40 in the vicinity of the three stays 41 has a positive red pressure. The portion 42 between the portions 39 and 40 and the edge of the suction aperture is light red, yellow, and light blue like the rotor side, and is at a normal pressure. Furthermore, the outer portion 43 that is slightly away from the edge portion of the suction aperture has a deep red color.

Based on the above measurement, the present inventor has a negative pressure near the edge on the discharge direction side from the center of the suction port diameter, and a positive pressure near the edge on the opposite side of the discharge direction from the center of the suction port diameter. And found that it was getting bigger.
This is because the single-side suction type sirocco fan has a completely different air suction characteristic in that only the vicinity of the discharge side edge of the suction port becomes a high-pressure zone. Therefore, noise and air volume reduction cannot be prevented unless measures different from those for the one-side suction type are taken.
The present invention has been made based on the above background. In a centrifugal fan motor having a symmetrical air suction port on both sides of a motor outer frame and a discharge port on one side surface perpendicular to the air suction port, An object of the present invention is to provide a centrifugal fan motor capable of suppressing the reduction of air flow and the reduction of air volume.

In order to achieve the above object, claim 1 of the present invention is a centrifugal fan having symmetrical air suction ports on both sides of a motor outer frame and having a discharge port on one side surface perpendicular to the air suction port. In the motor, the center of the diameter of the air suction port and the rotation center of the blade on which the rotor is implanted are arranged such that the center of the diameter of the air suction port approaches the direction of the discharge port with respect to the discharge port. The air suction area below the rotation center of the blade is increased with respect to the air suction area on the upper side from the rotation center of the blade.
Claim 2 of the present invention is a centrifugal fan motor having symmetrical air suction ports on both sides of the motor outer frame and having a discharge port on one side surface perpendicular to the air suction port.
The center of the diameter of the air inlet and the rotation center of the blade in which the rotor is implanted are matched,
In addition, in the pressure distribution of the air suction port, the suction surface near the outer edge of the air suction port located farthest from the discharge port has a positive suction surface in order to limit the air blowing. Near the outer edge of the air suction port closest to the discharge port, the suction surface is widened to increase the air suction in the vicinity of the negative pressure distribution near the outer edge of the air suction port. The air suction area on the lower side from the rotation center of the blade is increased with respect to the air suction area on the upper side from the rotation center.

  According to the above configuration, in the double-sided suction type centrifugal fan motor, the shape of the suction port can be optimized, and the air volume can be increased at the same noise time as compared with the conventional one. On the other hand, the noise value can be reduced at the same air volume.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing an example in which the suction area is reduced at a position where the pressure is positive and the pressure value is large based on the pressure distribution of the centrifugal fan motor having both suction ports.
The rectangular outer frame 1 has a motor housing portion 5 for housing a motor attached to a stay (not shown). The motor housing portion 5 is connected to an air discharge port 6 provided on the side surface of the motor outer frame 1, and a substantially semicircular inner wall is formed on the opposite side of the discharge port 6. The center of the diameter 4 of the blade | wing attached to the outer periphery of a motor and the center of the circular shaped suction inlet 3 with which a part of upper part was block | closed correspond. The center of the diameter 4 of the blade is disposed at a position shifted to the right side with respect to the substantially semicircular center 5 a of the motor housing 5. The suction port provided on the stay side has the same configuration.

  As shown in FIG. 8, the portion near the edge of the suction port 2 opposite to the discharge port 6 with respect to the center of the suction port 2 and the pressure distribution of the suction port is positive and the pressure value is large is indicated by 2a. So that air blowing is restricted. In this configuration, no change in airflow / static pressure performance occurs with the same input, but noise can be reduced. As an actually measured data, the noise value can be reduced by 1.2% (0.4 db) by adopting such a configuration.

FIG. 2 is a diagram illustrating an example in which the suction area is increased at a position where the pressure is negative and the pressure value is small based on the pressure distribution of the centrifugal fan motor having both suction port shapes.
The shape of the motor accommodating portion 5 in the rectangular outer frame 1 and the configuration connected to the discharge port 6 are the same as those in FIG. 1, and the center of the blade diameter 4 and a part of the lower portion are The center of the expanded circular suction port 7 coincides with the center of the semi-circular portion 5a of the motor accommodating portion 5 and is located at a position shifted to the right side as shown in FIG. It is the same.

As shown in FIG. 8, a portion near the edge of the suction port 7 on the same side as the discharge port 6 with respect to the center of the suction port 7 and having a negative pressure distribution at the suction port and having a small pressure value is indicated by 7a. In addition, the circular outer portion is enlarged to be elliptical so that the air suction amount can be increased.
With this configuration, the noise value hardly changes, and an effect of increasing the air volume and reducing the static pressure can be obtained. Therefore, when the low pressure portion is opened in an elliptical shape, the larger the major axis in one direction of the ellipse, the larger the air volume and the lower the static pressure. Therefore, noise can be reduced at the same air volume.

FIG. 3 is a diagram showing an embodiment of a centrifugal fan motor according to the present invention.
As shown in FIG. 1 and FIG. 2, if the pressure distribution is positive and the portion where the pressure value is large is blocked and the portion where the pressure distribution is negative and the pressure value is small is widened, noise can be prevented with the same air volume, If the noise is the same, the air volume can be increased. In order to have the same effect as this, the suction port 9 has a circular shape, blocks the portion where the pressure is positive and the pressure value is high with respect to the suction port center 4a, and the pressure is negative and the pressure value The blade rotation center 4b is displaced in a direction away from the discharge port 6 by discharging a predetermined amount in consideration of expanding the portion where is small.

FIG. 4 shows an external perspective view of the eccentric fan-shaped centrifugal fan motor of FIG.
Since the blade rotation center 4b is shifted from the circular suction port center 4a to the opposite side of the discharge port 6, the width A exposed from the suction port 9 of the blade 11a is the width B exposed from the suction port 9 of the blade 11b. The opening area of the suction port near the blade 11a is larger than the opening area of the suction port near the blade 11b.
The portion 9a having a positive pressure and a high pressure value is blocked, and the portion 9b having a negative pressure and a low pressure value is widened. Therefore, the conventional circular suction port is provided and the rotational speed can be increased for the bearing life. By applying the present invention to a centrifugal fan motor that does not have this, it is possible to obtain further airflow with the same conventional input. In addition, noise can be reduced when the air volume is the same.

FIG. 5 is a view showing another embodiment of the centrifugal fan motor according to the present invention.
In this embodiment, the configurations of FIGS. 1 and 2 are combined as they are. The center of the blade diameter 4 and the center of the suction port 8 coincide with each other, the suction portion of the high pressure portion 8a above the center of the suction port 8 is blocked, and the lower pressure portion The suction surface of 8b is enlarged. The effects of FIGS. 1 and 2 are provided.

FIG. 6 shows an external perspective view of the centrifugal fan motor having the unusual suction shape shown in FIG.
The edge of the suction port 8 on the side opposite to the discharge port 6 is aligned so that the blade rotation center coincides with the center of the suction port, and the edge of the suction port 8 on the discharge port 6 side has an elliptical long-axis shape. The edge is formed to have a shape of an ellipse in the minor axis direction. The width C of the suction port 8 on the discharge port 6 side is larger than the width D of the suction port 8 on the opposite side to the discharge port 6 side, and the opening area of the suction port near the blade 12a is that of the suction port near the blade 12b. It becomes larger than the opening area.
This shape has the same effect as in FIG.

  The above embodiment has shown an example in which the shape of the suction port is circular and the curvature of a part of the circle is increased or decreased, but the pressure distribution of the suction port is positive and the portion where the pressure value is large The shape of the suction port may be other than that of the embodiment as long as the suction area is limited by blocking and the pressure distribution is negative and the portion where the pressure value is small expands the suction area.

  It is used in electronic devices that need to send air to inhale from both directions and exhale at right angles.

It is a figure which shows the example which reduces a suction area about the position where a pressure is positive based on the pressure distribution of the centrifugal fan motor of both suction inlet shape, and a pressure is large. It is a figure which shows the example which increases a suction area about the position where pressure is negative and pressure is small based on the pressure distribution of the centrifugal fan motor of both suction inlet shapes. It is a figure which shows embodiment of the centrifugal fan motor by this invention. It is a perspective view which shows the external appearance of the centrifugal fan motor of FIG. It is a figure which shows other embodiment of the centrifugal fan motor by this invention. It is a perspective view which shows the external appearance of the centrifugal fan motor of FIG. It is a perspective view which shows an example of the case of the conventional centrifugal fan motor. It is a figure for demonstrating the pressure distribution of the conventional centrifugal fan motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer frame 2, 7, 8, 9 Suction port 3 Suction diameter 4 Blade diameter 5 Motor accommodating part 6 Discharge port 10 Rotor

Claims (2)

In a centrifugal fan motor having symmetrical air inlets on both sides of the motor outer frame and having outlets on one side surface perpendicular to the air inlets,
Arrange the center of the diameter of the air suction port and the center of rotation of the blade in which the rotor is planted so that the center of the diameter of the air suction port approaches the direction of the discharge port with respect to the discharge port. And
A centrifugal fan motor, wherein an air suction area on the lower side from the rotation center of the blade is increased with respect to an air suction area on the upper side from the rotation center of the blade. In a centrifugal fan motor having symmetrical air inlets on both sides of the motor outer frame and having outlets on one side surface perpendicular to the air inlets,
The center of the diameter of the air inlet and the rotation center of the blade in which the rotor is implanted are matched,
In addition, in the pressure distribution of the air suction port, the suction surface near the outer edge of the air suction port located farthest from the discharge port has a positive suction surface in order to limit the air blowing. Near the outer edge of the air suction port closest to the discharge port, the suction surface is widened to increase the air suction in the vicinity of the negative pressure distribution near the outer edge of the air suction port. A centrifugal fan motor characterized in that an air suction area on the lower side from the rotation center of the blade is increased with respect to an air suction area on the upper side from the rotation center.

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