JP2013088023A - Ventilation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve air blowing efficiency in a ventilation device that transfers air through a pipe.SOLUTION: The ventilation device is installed within a pipe 4 so provided as to make an outdoor side 2 communicate with an indoor side 3. The ventilation device is also configured with a frame 5 of a frame body, a fan 6 provided within the frame 5, a motor 7 provided at a downstream side of the fan 6 within the frame 5 to rotate the fan 6, and a motor cover 8 mounted at a downstream side of the motor 7 and provided with an air flow guide means 9 which guides an air flow to a negative pressure area in a downstream side central part of the motor 7. In this configuration, because the air flow is guided to the downstream side center of the motor, the negative pressure area is reduced and the eddy to be generated can be reduced, so that air bowing efficiency can be improved in the ventilation device.

Description

  The present invention relates to a ventilation device that is inserted into a pipe, conveys air through the pipe, and discharges indoor air to the outside.

  Conventionally, this type of ventilation apparatus is known as a ventilation apparatus in which a fan is attached to a motor attached to a frame (see, for example, Patent Document 1).

  Hereinafter, the ventilator will be described with reference to FIG.

  As shown in FIG. 3, the main body 101 of the ventilator includes a motor 103 and a fan 104 that is rotated by the motor 103 in a frame 102, and is inserted into a pipe 107 that communicates an indoor 105 and an outdoor 106. By being worn, the air in the room 105 is exhausted to the outside 106 through the pipe 107.

JP 2008-209090 A (7th page, FIG. 1)

  In such a conventional ventilator, since the motor is provided on the downstream side of the fan, the flow is blocked by the motor, and the air flows only on the outer peripheral side of the pipe. At that time, the central portion on the downstream side of the motor becomes a negative pressure region (A in FIG. 3), and a large vortex is generated due to a pressure difference with the outer peripheral side of the pipe. This vortex has a problem that the blowing efficiency is lowered.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a ventilation device that can reduce the vortex generated in the central portion on the downstream side of the motor and improve the ventilation efficiency.

  In order to achieve this object, the present invention provides a ventilation device provided in a pipe that communicates between the outside and the inside of the room, the frame of the frame, the fan provided in the frame, and the above-mentioned in the frame. A ventilator comprising a motor provided on the downstream side of the fan and rotating the fan, and a motor cover mounted on the downstream side of the motor, and having an airflow guiding means for guiding an airflow to a central portion on the downstream side of the motor. This achieves the intended purpose.

  According to the present invention, there is provided a ventilation device provided in a pipe provided in communication between the outdoor and indoors, a frame, a fan provided in the frame, and a downstream side of the fan in the frame. The motor has a motor that rotates the fan, and a motor cover that is mounted on the downstream side of the motor, and has an airflow guiding means that induces an airflow in the central portion on the downstream side of the motor. By inducing an air flow in the negative pressure region, the negative pressure region can be reduced and the generated vortex can be reduced, so that the effect of improving the blowing efficiency can be obtained.

The block diagram which shows the ventilation apparatus of Embodiment 1 of this invention The block diagram which shows the ventilation apparatus of Embodiment 2 of this invention Configuration diagram showing a conventional ventilator

  The ventilator according to claim 1 of the present invention is a ventilator provided in a pipe that communicates between the outside and the inside of the room, the frame of the frame, the fan provided in the frame, and the fan in the frame. A configuration comprising a motor provided on the downstream side for rotating the fan, and a motor cover mounted on the downstream side of the motor, and having an airflow guiding means for guiding an airflow to a negative pressure region in a central portion on the downstream side of the motor. Have As a result, the air flow is induced in the central portion on the downstream side of the motor, so that the negative pressure region is reduced and the generated vortex can be reduced, so that the air blowing efficiency is improved.

  The motor cover may be provided with a wind direction plate as an air flow guiding means. As a result, the airflow is guided to the motor downstream side central portion between the motor cover and the wind direction plate, so that the negative pressure region is reduced and the generated vortex can be reduced, so that the blowing efficiency is improved. There is an effect.

  Further, the wind direction plate may have a ring-shaped outer shape. Thereby, the airflow can be uniformly induced over the entire circumference of the wind direction plate, and the generation of vortices in the central portion on the downstream side of the motor can be efficiently suppressed.

  The cross section of the wind direction plate may be a wing shape. Accordingly, when the airflow is induced, the generation of vortices due to the separation of the flow from the wind direction plate can be suppressed, so that the effect of making it possible to minimize the loss due to the wind direction plate is achieved.

  Further, a gap formed by the motor cover and the wind direction plate may be configured as a nozzle shape. As a result, the airflow induced by the wind direction plate is accelerated when passing through the gap between the motor cover and the wind direction plate, and the flow on the outer periphery side of the pipe is attracted by the attraction effect due to the high flow velocity, and the large air volume is reduced. Since the negative pressure region is reduced and the generated vortex can be reduced because it flows to the central portion on the downstream side, there is an effect that the blowing efficiency is improved.

  Moreover, you may make it the structure which has the substantially cone-shaped cover smoothly connected to the lower part of the said motor cover. As a result, the air current on the outer periphery of the pipe flows along a substantially conical shape at the lower part of the motor cover due to the Coanda effect, and is guided to the downstream central portion of the motor, thereby reducing the negative pressure region and reducing the generated vortex. Therefore, there is an effect that the air blowing efficiency is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the ventilator 1 is installed in a cylindrical pipe 4 provided so that the outdoor 2 and the indoor 3 communicate with each other, a frame 5 as a frame, and a fan provided in the frame 5. 6, a motor 7 provided on the downstream side of the fan 6 in the frame 5 for rotating the fan 6, and a motor cover 8 mounted on the downstream side of the motor 7. The airflow guide means 9 for guiding the airflow to the negative pressure region of the part is composed of a wind direction plate 9 a provided on the outer periphery on the downstream side of the motor cover 8. In the present embodiment, the pipe 4 is cylindrical, but the shape of the pipe 4 is not particularly limited as long as the ventilation device 1 can be installed, such as a rectangular tube.

  In the above configuration, air flows from the indoor 3 to the outdoor 2 as the fan 6 rotates. At this time, a part of the airflow drawn toward the outer peripheral side of the pipe 4 when passing through the motor 7 is guided to the downstream central portion of the motor 7 by the airflow guiding means 9 so that the negative pressure region is formed. Since it becomes small and the vortex to generate | occur | produce can be made small, it becomes possible to improve ventilation efficiency.

  Further, by providing the motor cover 8 with a wind direction plate 9 a as the air flow guiding means 9, the air flow passes between the motor cover 8 and the wind direction plate 9 a to the downstream central portion of the motor 7. Since the negative pressure region is reduced and the generated vortex can be reduced, the blowing efficiency is improved.

  Further, by adopting a configuration in which the outer shape of the wind direction plate 9a is ring-shaped, air current can be uniformly induced over the entire circumference of the wind direction plate 9a, and vortex is generated in the central portion on the downstream side of the motor 7. Can be efficiently suppressed, so that the air blowing efficiency is improved. In the present embodiment, the outer shape of the wind direction plate 9a is a ring shape, but one or a plurality of plate-shaped wind direction plates may be provided.

  In addition, by adopting a configuration in which the cross-sectional shape of the wind direction plate 9a is an airfoil, it is possible to suppress the generation of vortices due to separation of the flow from the wind direction plate 9a when the airflow is induced. The loss due to can be minimized. In the present embodiment, the cross-sectional shape of the wind direction plate 9a is an airfoil, but the shape is not particularly limited as long as it can induce an air flow such as a rectangle.

  Further, by forming the gap formed by the motor cover 8 and the wind direction plate 9a into a nozzle shape, the air flow induced by the wind direction plate 9a passes through the gap between the motor cover 8 and the wind direction plate 9a. The flow on the outer periphery side of the pipe 4 is attracted by the attraction effect due to the fast flow velocity, and the large airflow flows to the central portion on the downstream side of the motor 7, so that the negative pressure region is reduced and the generated vortex can be reduced. Since it can do, ventilation efficiency improves.

(Embodiment 2)
As shown in FIG. 2, the airflow guiding means 9 has a substantially conical cover 9b smoothly connected to the downstream side of the motor cover 8, so that the airflow on the outer peripheral side of the pipe 4 is caused by the Coanda effect. Since it flows along the substantially conical cover 9b at the lower part of the motor cover 8 and is guided to the downstream central portion of the motor 7, the negative pressure region is reduced and the generated vortex can be reduced, so the blowing efficiency Will improve.

  The ventilator according to the present invention makes it possible to reduce the vortex generated by reducing the negative pressure region by inducing the air flow in the negative pressure region in the central portion on the downstream side of the motor. It is inserted and useful as a ventilator, a blower or the like that conveys air through a pipe.

DESCRIPTION OF SYMBOLS 1 Ventilator 2 Outdoor 3 Indoor 4 Pipe 5 Frame 6 Fan 7 Motor 8 Motor cover 9 Airflow guide means 9a Airflow direction plate 9b Substantially conical cover 101 Main body 102 Frame 103 Motor 104 Fan 105 Indoor 106 Outdoor 107 Pipe

Claims (6)

A ventilation device provided in a pipe communicating between the outdoor and indoors,
A frame of a frame,
A fan provided in the frame;
A motor provided on the downstream side of the fan in the frame and rotating the fan;
A motor cover mounted on the downstream side of the motor;
A ventilator characterized in that an airflow guiding means for guiding an airflow is provided in a negative pressure region in a central portion on the downstream side of the motor. The ventilation apparatus according to claim 1, wherein the airflow guiding means is a wind direction plate provided on the motor cover. The ventilation device according to claim 2, wherein an outer shape of the wind direction plate is a ring shape. The ventilation device according to claim 2, wherein a cross-sectional shape of the wind direction plate is a wing shape. The ventilation apparatus according to claim 2 or 3, wherein a gap created by the motor cover and the wind direction plate has a nozzle shape. The ventilation apparatus according to claim 1, further comprising a substantially conical cover that is smoothly connected to a downstream side of the motor cover.

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