JP3149276B2 - Ceiling ventilation fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilating fan for a ceiling which has a structure in which an opening on the lower surface of an outer frame disposed behind a ceiling is covered with a decorative frame from the indoor side.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional configuration of a ceiling fan of this type. In this device, a fan casing 2 having a main intake port 2a on a lower surface and an auxiliary intake port 2b on an upper surface, and a portion corresponding to the auxiliary intake port 2b are provided in an outer frame 1 arranged behind the ceiling. And a fan 4 composed of a centrifugal fan arranged so as to be rotationally driven by the motor 3 in the fan casing 2. The lower opening 1a of the outer frame 1 is covered with a removable decorative frame 5 from the indoor side, and a number of ventilation holes 5a are formed in the outer peripheral portion of the lower surface of the decorative frame 5.

In the above configuration, when the fan 4 is driven to rotate by the motor 3, the air in the room is moved from the vent 5 a of the decorative frame 5 to the inside of the outer frame 1 by the blowing action of the fan 4 as shown by an arrow a. Inhaled. Most of the air sucked into the outer frame 1 is sucked into the fan casing 2 from the main intake port 2a as shown by the arrow B, and the remaining air is blown into the inner surface of the outer frame 1 and the fan as shown by the arrow C. The air is sucked into the fan casing 2 from the upper auxiliary intake port 2b through a gap between the casing 2 and the outer surface. The air drawn into the fan casing 2 is discharged to the outside through a discharge port 6 provided in the outer frame 1 through a duct 7 as indicated by an arrow d.

[0004]

However, in the above-described conventional structure, a part of the air sucked into the outer frame 1 is formed around the main intake port 2a, that is, the lower surface 2c of the fan casing 2. The collision causes a wall of an airflow such as an air curtain to be formed at this portion. As a result, the pressure loss between the decorative frame 5 and the lower surface 2c of the fan casing 2 increases, the air volume decreases, and loud noise occurs. There is a problem that occurs.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a ceiling ventilation fan capable of preventing a decrease in air volume and reducing noise.

[0006]

According to the present invention, there is provided an outer frame provided at the back of a ceiling with an open lower surface, and a vent opening downwardly at the outer peripheral portion of the lower surface portion. A decorative frame mounted so as to cover the portion from the indoor side, a fan casing disposed in the outer frame and having an intake port on a lower surface, and disposed in the fan casing so as to correspond to the intake port,
A fan that is driven to rotate by a motor to suck room air into the fan casing through the ventilation port and the air intake port, and then discharges the air to the outside of the outer frame; and a sound absorbing material disposed on a lower surface side of the fan casing. The guide member has a communication port on an upper surface portion corresponding to the intake port, and has a diameter smaller than that of the communication port on a lower surface portion of the decorative frame .
Has an inlet opening corresponding to the outlet port, the inner surface is formed in a recessed curved surface that bulges upward toward the communication opening from the intake opening, the communication <br from the intake opening to the entire circumference of the inner surface The groove-shaped concave portion and the mountain-shaped convex portion alternately extend toward the passage.
As described above, a large number of uneven portions having a wavy shape in the circumferential direction are formed.

[0007]

[0008]

When the indoor air is sucked into the makeup through the ventilation opening of the makeup frame by the blowing action of the fan, the air flows along the inner surface of the guide member along the uneven portion and is guided to the communication port. Then, the air is sucked into the fan casing from an intake port of the fan casing, and then discharged to the outside.

At this time, the air flowing through the inner surface of the guide member is smoothly guided along the inner surface to the intake port of the fan casing, and is rectified by the uneven portion. Air flows smoothly to the mouth. Therefore, it is possible to minimize the collision of air near the periphery of the intake port of the fan casing, thereby minimizing the pressure loss between the decorative frame and the fan casing, and preventing a reduction in air volume and noise. Generation can be suppressed as much as possible.

[0010] Further, noise generated by blowing air is absorbed by a guide member made of a sound absorbing material, so that noise can be reduced. In addition, since the inner surface of the guide member has a wavy shape having irregularities and has a large area for absorbing sound, noise can be more efficiently reduced. Further, since the sound is irregularly reflected on the inner surface of the guide member, the sound leaking from the ventilation port of the decorative frame to the indoor side can be reduced.

The vent is formed in the outer peripheral portion of the lower surface of the decorative frame corresponding to the intake opening of the guide member .
As a result , the air sucked from the ventilation hole flows well along the inner surface of the guide member, and the rectifying effect of the guide member is increased.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In FIG. 1 showing the overall configuration,
A rectangular box-shaped outer frame 11 having an opening 11a on the lower surface
Is disposed behind the ceiling by screwing a flange 12 at a lower end portion to a ridge 14 of a ceiling 13. The decorative frame 15 is detachably mounted by an unillustrated mounting means so as to cover the lower surface opening 11a of the outer frame 11 from the indoor side. A large number of ventilation holes 16 facing downward are formed in the outer peripheral portion of the lower surface of the decorative frame 15.

In the outer frame 11, a so-called spiral fan casing 17 is provided. The fan casing 17 has a main intake port 18 as an intake port on a lower surface, and an auxiliary intake port 19 on an upper surface.
An exhaust port 21 communicating with a discharge port 20 of the outer frame 11 is provided on a side portion. A duct 22 disposed behind the ceiling is connected to the discharge port 20.

A motor support 2 is provided on the lower surface of the upper wall of the outer frame 11.
The motor support 23 is provided with a motor 24.
Is installed. The motor 24 is disposed so as to be inserted into the auxiliary intake port 19, and has a downward rotating shaft 2.
A fan 25 composed of a centrifugal fan is attached to 4a. The fan 25 is arranged in the fan casing 17 so as to correspond to the main intake port 18 and the auxiliary intake port 19.

A guide member 26 made of a sound-absorbing material, for example, made of styrene foam, is provided on the lower surface of the fan casing 17 on the lower surface side. This guide member 26 is shown in FIG.
As shown in FIG. 2, a circular communication port 27 corresponding to the main intake port 18 of the fan casing 17 is provided at a substantially central portion of the upper surface portion, and the communication port 27 is provided on the lower surface portion.
It has a larger diameter and has a circular intake opening 28 corresponding to the ventilation opening 16 of the decorative frame 15, and the inner surface 29 has a concave curved surface bulging upward from the intake opening 28 toward the communication opening 27. The inner surface 29 is formed with a large number of concave and convex portions 30 extending from the intake opening 28 toward the communication port 27 and waving in the circumferential direction. These uneven portions 30 are composed of groove-shaped concave portions 30a and mountain-shaped convex portions 30b.

In the above configuration, when the fan 25 is driven to rotate by the motor 24, the air in the room is caused to flow through the ventilation holes 16 of the decorative frame 15 as shown by the arrow A by the blowing action of the fan 25. From the makeup frame 15. Most of the air sucked into the makeup frame 11 is indicated by an arrow B
As shown by, the inner surface 29 of the guide member 26 flows along the uneven portion 30 from the intake opening 28 of the guide member 26 and is guided to the communication port 27, and the fan casing 17 extends from the main intake port 18 of the fan casing 17. After being sucked into the inside 17, it is discharged from the discharge port 20 to the outside through the duct 22 as shown by the arrow C.

A part of the air sucked into the decorative frame 15 passes through a gap between the inner surface of the outer frame 11 and the outer surface of the fan casing 17 as shown by an arrow D from the upper auxiliary intake port 19. The air is sucked into the fan casing 17 and discharged to the outside together with the air sucked from the main air inlet 18.

Here, the air flowing through the inner surface 29 of the guide member 26 is smoothly guided along the inner surface 29 to the main intake port 18 of the fan casing 17 and
Since the flow is rectified by the uneven portion 30, the air flows smoothly from the ventilation port 16 to the main intake port 18. Therefore, it is possible to minimize the collision of air in the vicinity of the main intake port 18 of the fan casing 17, thereby minimizing the pressure loss between the decorative frame 15 and the fan casing 17, and preventing a decrease in air volume. It is possible to suppress the generation of noise as much as possible.

Further, since the guide member 26 is formed of styrene foam having a sound absorbing property, noise generated by blowing air can be absorbed by the guide member 26 to reduce noise. Moreover, the inner surface 29 of the guide member 26 has a wavy shape having the uneven portion 30 and has a large area for absorbing sound, so that noise can be reduced more efficiently. Further, since the sound is irregularly reflected on the inner surface 29 of the guide member 26, the sound leaking from the ventilation port 16 of the decorative frame 15 to the indoor side (downward) can be reduced, and the noise can be reduced as a whole.

Further, in this embodiment, the decorative frame 1 is formed so that the ventilation port 16 corresponds to the intake opening 28 of the guide member 26.
5 is formed on the outer peripheral portion of the lower surface portion, so that the air sucked from the ventilation port 16 flows well along the inner surface 29 of the guide member 26 as in the above-described embodiment, and the guide member 2
6 can further increase the rectifying effect.

[0021]

According to the ventilation fan for a ceiling according to the first aspect, the guide member is provided on the lower surface side of the fan casing having the intake port on the lower surface, thereby guiding the air sucked from the ventilation hole of the decorative frame. Rutotomoni be guided smoothly to the intake port by the inner surface of the member, with rectified by uneven portion of the inner surface
Can, made as much as possible to prevent the pressure loss between the decorative frame and the fan casing Accordingly, with a decrease in air volume can be prevented, it is possible to suppress the generation of noise as much as possible.

Further, noise generated by the blowing can be absorbed by the guide member made of a sound absorbing material, so that the noise can be reduced. Further, the inner surface of the guide member has a wavy shape having an uneven portion. Since the area for absorbing sound is large, noise can be more efficiently reduced. Further, since the sound is diffusely reflected on the inner surface of the guide member, the sound leaking from the ventilation port of the decorative frame to the indoor side can be reduced, and the noise can be reduced as a whole.

Further , the intake port is formed on the outer peripheral portion of the lower surface of the decorative frame so as to correspond to the intake opening of the guide member, so that the air taken in from the ventilation port is good along the inner surface of the guide member. And the rectification effect of the guide member can be further increased.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view of a guide member.

FIG. 3 is a longitudinal sectional view taken along line XX in FIG. 2;

FIG. 4 is a diagram corresponding to FIG. 1 showing a conventional configuration.

[Explanation of symbols]

11 is an outer frame, 11a is an opening, 13 is a ceiling, 15 is a decorative frame, 16 is a vent, 17 is a fan casing, 18 is a main intake port (intake port), 24 is a motor, 25 is a fan, 26
Is a guide member, 27 is a communication port, 28 is an intake opening, 29 is an inner surface, 30 is an uneven portion , 30a is a concave portion, and 30b is a convex portion .

Claims (1)

(57) [Claims] An outer frame disposed at the back of the ceiling with an open lower surface, and a ventilation port facing downward on an outer peripheral portion of the lower surface so as to cover the lower opening of the outer frame from the indoor side. A decorative frame to be mounted, a fan casing disposed in the outer frame and having an intake port on a lower surface, and disposed in the fan casing so as to correspond to the intake port, and is rotationally driven by a motor to drive the indoor space. A fan that sucks air into the fan casing through the ventilation port and the air intake port and then discharges the air to the outside of the outer frame; and a guide member made of a sound absorbing material disposed on a lower surface side of the fan casing. The guide member has a communication port corresponding to the intake port on the upper surface and a diameter larger than the communication port on the lower surface , and
Has an inlet opening corresponding to the vent, the inner surface is formed in a recessed curved surface that bulges upward toward the communication opening from the intake opening, wherein from said inlet opening to the entire circumference of the inner surface <br / > Groove-shaped concave portions and mountain-shaped convex portions alternately extend toward the communication port
A ventilation fan for a ceiling characterized by forming a large number of uneven portions having a wavy shape in a circumferential direction as described above.