JP2005307869A - Turbo fan and air conditioner - Google Patents

Abstract

A turbo fan with improved air blowing performance and static pressure is provided.
A boss 15 fixed to a shaft 5a of an electric motor 5, a main plate 9 covering the electric motor 5, a plurality of blades 6 connected to a tip portion of the main plate 9 and provided at an arbitrary interval, A shroud 7 installed on the other end of the blade 6 and a centrifugal inner blade 4 are provided. With the two fans of the blade 6 and the inner blade 4, the blowing performance and the static pressure can be improved. .
[Selection] Figure 1

Description

  The present invention relates to a turbo fan and an air conditioner.

  A conventional turbofan will be described with reference to FIGS.

  FIG. 6 is an external perspective view of an indoor unit of a ceiling-embedded air conditioner equipped with a conventional turbo fan, and FIG. 7 is a perspective view of the turbo fan.

  In FIG. 6, the blower circuit provided in the indoor unit 12 passes through a suction part 13 for sucking indoor air, an air filter (not shown), a heat exchanger (not shown), the turbo fan 1, and the blowing part 14. It is composed of air flow passages that flow through. The turbo fan 1 is connected to an electric motor (not shown) and is driven to rotate.

  Next, the turbo fan 1 will be described in detail with reference to FIG.

  The turbofan 1 is connected to the wall 2 covering the motor, the main plate 9 made of a circular portion in the direction perpendicular to the axial direction of the boss 15 from the outer periphery thereof, and connected to the front end portion of the main plate 9 with an arbitrary interval A plurality of blades 6 provided and a shroud 7 installed on the other end of these blades 6 are provided, and a wall 2 covering the motor of the main plate 9 is provided with a vent hole 3 for cooling the motor. A cap 8 for forming an air passage from the ventilation port 3 to the front side of the main plate 9 is attached to the wall 2, and a boss 15 fixed to an electric motor shaft (not shown) is attached to the center of the cap 8. Is formed.

With the above configuration, when the turbo fan 1 rotates, the air that has cooled the electric motor flows out from the ventilation port 3 and flows out while hitting the cap 8, so that the air flows toward the main plate 9 (for example, Patent Documents). 1).
Japanese Patent No. 3131625

  However, in the configuration of the conventional turbofan 1, since the air sucked from the outer periphery of the bottom portion of the blade 6 is blown out from the ventilation port 3, there is a problem that the air flow performance is deteriorated and the static pressure is reduced. .

  Further, there is a problem that the noise level increases due to the sound generated when the air is blown out from the ventilation port 3.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a turbo fan that has a low noise level, excellent air blowing performance, and can rationally cool an electric motor.

  In order to solve the above-described conventional problems, a turbofan according to the present invention is provided with a boss fixed to a shaft of an electric motor, a main plate that covers the electric motor, and a front end portion of the main plate that is connected at an arbitrary interval. A plurality of blades, a shroud installed on the other end of the blade, and a centrifugal inner blade, and by using two fans of the blade and the inner blade, air blowing performance and static pressure can be improved. it can.

  The turbofan of the present invention has an improved static pressure and excellent air blowing performance.

  A first invention includes a boss fixed to a shaft of an electric motor, a main plate that covers the electric motor, a plurality of blades that are connected to a tip portion of the main plate and provided at an arbitrary interval, and the other end of the blade It is provided with a shroud erected on the part and a centrifugal inner blade, and air blowing performance and static pressure can be improved by two fans of the blade and the inner blade.

  In particular, the second invention is the one in which the inner blades are arranged in a portion covering the electric motor of the main plate of the first invention, and the two fans of the blade and the inner blade are arranged in series, and the blowing performance and the static pressure are arranged. Can be greatly improved.

  In particular, the third invention is provided with a ventilation port arranged in a portion covering the electric motor of the main plate of the second invention, and a bowl-shaped cap covering the open surface of the ventilation port, and the ventilation is performed by the inner blade. The amount of air flowing out from the mouth is increased, and the cooling effect of the electric motor can be improved. In addition, since the inner blades are positioned on the bottom side of the main plate, air flows to the bottom, which has been difficult to flow in the past, and airflow performance is improved.

  In particular, the fourth aspect of the present invention includes a ventilation port disposed in a portion covering the electric motor of the main plate of the first aspect of the invention, and a saddle-shaped cap that covers an open surface of the ventilation port, and an inner blade is disposed on the cap. As a result, the amount of air flowing out from the ventilation port is increased, and the cooling effect of the electric motor can be improved.

  In particular, the fifth aspect of the invention includes a ventilation port disposed in a portion of the main plate of the second invention that covers the electric motor, a wall portion that covers an open surface of the ventilation port, and a support piece that supports the wall portion. Therefore, the amount of air flowing out from the ventilation port is increased, and the cooling effect of the electric motor can be improved. Further, the wind noise is reduced by the wall portion covering the open surface, and the productivity is improved because no saddle-shaped cap is required.

  In the sixth invention, in particular, the second inner blade is attached to the back surface of the main plate of any one of the third to fifth inventions, and the second inner blade allows air to be discharged from the outer periphery of the bottom plate of the turbofan. Suction, passing around the motor and blown out from the ventilation port, coupled with the action of the inner blades provided on the front side of the main plate, greatly increase the amount of air flowing out from the ventilation port and improve the wind speed around the motor Thus, the cooling effect of the electric motor can be dramatically improved.

  7th invention is provided with the heat exchanger and the turbo fan of any one of Claims 1-6, and can provide an air conditioner with favorable ventilation performance and heat exchange efficiency.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is an external perspective view of a turbo fan according to the first embodiment of the present invention. In addition, about the same part as a prior art example, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The electric motor 5 is an electric motor that rotationally drives the turbo fan 1, and the boss 15 of the turbo fan 1 is fixed to the shaft 5 a and is covered with the wall 17 of the main plate 9. A plurality of centrifugal inner blades 4 are provided on the wall 17.

  With the above configuration, when the turbo fan 1 is rotated by the electric motor 5, the air sucked from the central portion of the turbo fan 1 is sucked from the inner blade 4, and is pressurized and blown out in the outer peripheral direction. Further, it is sucked into the blade 6 of the turbo fan. That is, a part of the air passes through both the inner blade 4 and the blade 6 so that a high static pressure can be achieved. Further, even in a portion where the wind of the shroud 7 of the turbofan 1 is difficult to flow, the airflow performance is improved by being blown by the inner blade 4.

(Embodiment 2)
FIG. 2 is an external perspective view of a turbo fan according to the second embodiment of the present invention. The same parts as those of the conventional example and the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, as shown in FIG. 2, a centrifugal inner blade 4 is provided on a saddle-shaped cap 8 that covers the vent hole 3 provided in the wall 2 described in the conventional example.

  With the above configuration, in addition to the air flow phenomenon described in the first embodiment, the amount of air flowing out from the ventilation port 3 is increased by the inner blade 4, and the cooling effect of the electric motor 5 can be further improved. is there.

(Embodiment 3)
FIG. 3 is an external perspective view of a turbo fan according to the third embodiment of the present invention. The same parts as those in the conventional example and the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, the inner blade 4 is provided on the cap 8 in the second embodiment, whereas the inner blade 4 is provided on the wall 2 covering the electric motor 5, and the cap 8 is located upstream. Since the inner blade 4 located closer to the bottom of the main plate 9 is closer to the bottom of the main plate 9, air flows into the bottom, which is difficult to flow in the past, and the air volume performance is improved.

(Embodiment 4)
FIG. 4 is an external perspective view of a turbo fan according to the fourth embodiment of the present invention. The same parts as those in the conventional example and the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, a wall 10 that covers the open surface of the vent 3 provided on the wall 2 that covers the electric motor 5 and a support piece 11 that supports the wall 10 are provided, and the wall 2 that covers the electric motor 5 is further provided on the wall 2. An inner blade 4 is provided.

  With the above configuration, the wind noise is suppressed by the wall portion 10 covering the open surface of the vent hole 3 and the conventional saddle-shaped cap 8 is not required, so that the productivity is improved and the turbo fan can be manufactured at a low cost. Can be formed.

(Embodiment 5)
FIG. 5 is a perspective view of a turbo fan according to the fifth embodiment of the present invention. The same parts as those in the conventional example and the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, as shown in FIG. 5, a centrifugal second inner blade 4a is attached to the back surface (motor 5 side) of the wall 2 of the turbofan 1 in the fourth embodiment. Combined with the action of the inner blade 4, the air speed of the air passing around the electric motor 5 is greatly increased, the amount of heat released from the electric motor 5 is increased, and the cooling effect of the electric motor 5 is dramatically improved.

  As described above, the turbofan according to the present invention improves the air blowing performance and static pressure, and also improves the cooling effect of the electric motor that rotationally drives the turbofan. Widely applicable.

1 is an external perspective view of a turbo fan according to Embodiment 1 of the present invention. External perspective view of turbo fan in Embodiment 2 of the present invention External perspective view of turbo fan in Embodiment 3 of the present invention External perspective view of turbo fan in Embodiment 4 of the present invention External appearance perspective view of turbofan in Embodiment 5 of this invention External perspective view of an indoor unit of an air conditioner equipped with a conventional turbofan A perspective view of a conventional turbofan

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turbofan 2 Wall 3 Ventilation hole 4 Inner blade | wing 4a 2nd inner blade 5 Electric motor 5a Shaft 6 Blade 7 Shroud 8 Cap 9 Main plate 10 Wall part 11 Supporting piece 15 Boss 17 Wall

Claims (7)

A boss fixed to the shaft of the electric motor, a main plate covering the electric motor, a plurality of blades connected to the front end portion of the main plate at an arbitrary interval, and a shroud installed on the other end portion of the blade And a turbofan characterized by comprising a centrifugal inner blade. The turbofan according to claim 1, wherein inner blades are arranged on a portion of the main plate covering the electric motor. The turbofan according to claim 2, further comprising: a vent hole disposed at a portion of the main plate covering the electric motor; and a saddle-shaped cap that covers an open surface of the vent hole. The turbofan according to claim 1, further comprising a vent hole disposed in a portion of the main plate covering the electric motor, and a bowl-shaped cap that covers an open surface of the vent hole, and an inner blade is disposed on the cap. The turbofan according to claim 2, comprising a ventilation port disposed in a portion of the main plate that covers the motor, a wall portion that covers an open surface of the ventilation port, and a support piece that supports the wall portion. . The turbofan according to any one of claims 3 to 5, wherein a second inner blade is attached to the back surface of the main plate. An air conditioner provided with a heat exchanger and the turbofan according to any one of claims 1 to 6.

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