JP5375108B2 - Recessed ceiling ventilation fan - Google Patents

Description

  The present invention relates to a ceiling-embedded ventilation fan that is embedded in an opening provided in a ceiling, is connected to a duct that is piped behind the ceiling and communicates with the outdoors, and ventilates the room.

  Conventionally, ceiling-embedded ventilation fans require a sufficient air volume and low noise when connected to a duct, so a centrifugal fan equipped with a fan casing containing centrifugal fan blades is incorporated. It was common (see, for example, Patent Document 1).

  Hereinafter, a conventional ceiling-embedded ventilation fan of this type will be described with reference to FIGS.

  As shown in FIG. 8, an electric motor 103 is fixed inside the main body case 102 of the ventilation fan main body 101, a centrifugal blower blade 105 is fixed to the rotating shaft 104 of the electric motor 103, and the centrifugal blower blade 105 is attached to the casing 106. The orifice 107 is disposed below the intake air chamber, and the air is sucked into the indoor air from the orifice 107 and exhausted to the outside through the exhaust port 108 located on the side.

As shown in FIG. 9, the casing 106 is formed in a scroll shape 109 that continuously forms an arc.
JP-A-6-207733 (FIGS. 1 and 3)

  In such a conventional ceiling-mounted ventilation fan, when operated, the centrifugal air blowing blade 105 rotates and blows air to generate resonance noise in the casing 106, but the lower surface of the casing 106 faces the room, Resonance noise propagates straight through the orifice 107 on the lower surface into the room, so that it is easy for people in the room to reach the room.

  The present invention solves such a conventional problem, and can reduce noise propagating indoors by reducing sound resonance in the fan casing without reducing the air volume. An object is to provide a ceiling-mounted ventilation fan.

  In order to achieve the above object, the ceiling-embedded ventilation fan of the present invention has a box-shaped main body frame having a lower surface with an intake port and a side surface with an exhaust port, and a rotation shaft on the main body frame. A fan casing comprising a centrifugal blower blade rotationally driven by an electric motor provided in a vertical direction, a scroll-shaped side surface surrounding the outer periphery of the centrifugal blower blade, and a lower surface portion having an orifice serving as a suction port; The fan casing is provided with a flat surface portion on the opposite side of the exhaust port with respect to the center of the centrifugal fan blade, and the flat surface portion is the flat surface portion. It is made into the shape which leaves | separates with respect to the internal peripheral surface of the said main body frame as it goes to the rotation direction of a centrifugal blowing blade.

  Another means is that a sound-absorbing material is attached to the inner side surface of the flat surface portion in the side surface portion.

  Another means is to provide a concavo-convex shape on the flat surface portion of the side surface portion.

  In another means, an outer wall having a double structure is provided outside the plane portion through the plane portion and the space.

  Further, the other means is a ceiling-embedded exhaust fan provided with a suction port for the other chamber for sucking air from the other chamber through the exhaust duct on a side surface of the main body frame, and the other chamber suction port Is provided in the vicinity of the flat portion of the side surface portion of the fan casing.

  According to the present invention, the fan casing is formed such that the side surface portion is formed on the flat portion on the side opposite to the exhaust port with respect to the center of the centrifugal air blowing blade, and the flat surface portion moves toward the rotation direction of the centrifugal air blowing blade. The effect of reducing the noise propagating into the room by reducing the resonance of the sound in the fan casing without reducing the air volume, by making the shape away from the inner peripheral surface of the It is possible to provide a ceiling embedded ventilation fan.

  In addition, by attaching a sound absorbing material to the inner side surface of the flat surface portion in the side surface portion, or by providing an uneven shape in the flat surface portion in the side surface portion, the sound absorbing material or the uneven shape in the flat surface portion can be used to Reducing the resonance further reduces the noise that propagates into the room.

  In addition, by providing an outer wall having a double structure through the space between the flat part and the space outside the flat part, sound propagating from the fan casing into the main body frame is attenuated and received indoors through the main body frame. Noise is reduced.

  In addition, there is a ceiling-embedded ventilation fan in which an air intake for another room is provided on the side surface of the main body frame through the exhaust duct, and the air intake for the other room is provided on the side surface of the fan casing. By providing in the vicinity of the flat surface portion, the ceiling-embedded ventilation fan that sucks and ventilates air from another room can also reduce noise in the intake air passage from the other room.

Ceiling embedded type ventilation fan of the present invention, the fan casing, the side surface portion is formed in a planar portion opposite the portion and the exhaust port relative to the center of the centrifugal blower blades, the plane portion rotation of the centrifugal blower blades It is shaped to move away from the inner peripheral surface of the main body frame as it goes in the direction, and when the sound generated in the fan casing is reflected in the fan casing, the side portion formed continuously in an arc shape By forming a part in a flat shape, the state of reflection changes, reducing resonance in the fan casing, and the part that forms the flat part is the part that has the least influence on the air volume Have

It is intended to attached the sound absorbing material on the inner surface of the flat portion in the side surface portion can sound reflected at the flat portion is further changed the status of reflection is sound absorbing, further reduce the resonance.

Also, having thereon a concavo-convex shape in a planar section of the side surface portion, the change in the reflection of sound in the plane portion is increased by the uneven shape, a decrease in resonance is further increased.

Further, the outer flat surface portion, which is provided an outer wall comprising a double structure via the flat portion and space, by providing an outer wall comprising a double structure, it is a layer of air, from the fan casing Sound that propagates through the body frame into the room is attenuated.

Further, in the ceiling-embedded-type ventilating fan provided with another compartment air inlet for intake air through the exhaust duct air from the other chamber on the side surface of the body frame, the fan casing side the other compartment inlet Even if the fan casing is formed to the same height as the intake port for the other chambers, the inner peripheral surface of the main body frame moves toward the rotation direction of the centrifugal air blowing blade. The air intake air passage from the other chamber is secured by the flat portion of the side surface portion of the fan casing that is shaped to be separated.

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

(Embodiment 1)
As shown in FIGS. 1 and 2, a box-shaped main body frame 3 having an intake port 1 with an opening on the lower surface and an exhaust port 2 on a side surface, and a rotation axis 4 on the main body frame 3 in a vertical direction. The fan casing 9 is composed of a centrifugal blower blade 6 that is rotationally driven by an electric motor 5 provided, a scroll-shaped side surface 7 that surrounds the outer periphery of the centrifugal blower blade 6, and a lower surface portion having an orifice 8 that serves as a suction port. The fan casing 9 has a side surface portion 7 formed on the flat surface portion 10 on the side opposite to the exhaust port 2 with respect to the center of the centrifugal blower blade 6, and the flat surface portion 10. Is shaped so as to move away from the inner peripheral surface 11 of the main body frame 3 as it goes in the direction of rotation of the centrifugal blower blade 6.

  According to the said structure, when the sound which generate | occur | produces in the fan casing 9 reflects in the fan casing 9, a part of side part 7 formed continuously in arc shape is formed in planar shape, The condition of reflection Change occurs, resonance in the fan casing 9 is reduced, and the place where the flat portion 10 is formed is the place that has the least influence on the air volume.

  As described above, according to the first embodiment, since the sound resonance in the fan casing 9 can be reduced without reducing the air volume, the noise transmitted to the room can be reduced. In contrast, it is possible to provide a low noise embedded ceiling fan. In addition, by using the flat portion 10, the amount of resin constituting the fan casing 9 can be reduced, which leads to cost reduction.

(Embodiment 2)
As shown in FIG. 3, the ceiling-embedded ventilation fan of the second embodiment is separate from the inner surface of the flat surface portion 10 in the side surface portion 7 of the fan casing 9 with respect to the ceiling-embedded ventilation fan of the first embodiment. The point which affixed the sound-absorbing material 12 which is a component of is different.

  According to the said structure, the sound reflected in the plane part 10 is absorbed, and the condition of reflection changes further, and resonance can further be reduced.

  As described above, according to the ceiling-embedded ventilation fan of the second embodiment, the sound absorbing material 12 in the flat portion 10 further reduces the resonance of the sound in the fan casing 9, thereby reducing the noise propagating into the room. It can be further reduced.

(Embodiment 3)
As shown in FIG. 4, the ceiling-embedded ventilation fan according to the third embodiment has an uneven shape on the inner surface of the flat surface portion 10 in the side surface portion 7 of the fan casing 9 with respect to the ceiling-embedded ventilation fan according to the first embodiment. 13 is different.

  According to the above configuration, the change in sound reflection at the flat surface portion 10 is increased by the uneven shape 13, and the reduction in resonance can be further increased.

  As described above, according to the ceiling-embedded ventilation fan of the third embodiment, the unevenness 13 in the flat portion 10 further reduces the resonance of the sound in the fan casing 9, thereby reducing the noise propagating into the room. It can be further reduced.

(Embodiment 4)
As shown in FIG. 5, the ceiling-embedded ventilation fan of the fourth embodiment has two planes 10 and a space through the space with respect to the ceiling-embedded ventilation fan of the first embodiment. The difference is that an outer wall 14 having a heavy structure is provided.

  According to the above configuration, by providing the outer wall 14 having a double structure, an air layer is formed, and sound propagating from the fan casing 9 through the body frame 3 into the room can be attenuated.

  As described above, according to the ceiling-embedded ventilation fan of the fourth embodiment, the noise transmitted to the room is further reduced.

(Embodiment 5)
As shown in FIGS. 6 and 7, the ceiling-embedded ventilation fan of the fifth embodiment exhausts air from other chambers on the side surface of the main body frame 3 with respect to the ceiling-embedded ventilation fan of the first embodiment. The other room intake port 16 for intake through 15 is provided, and the other room intake port 16 is provided in the vicinity of the flat surface portion 10 in the side surface portion 7 of the fan casing 9.

  According to the above configuration, even if the fan casing 9 is formed to the same height as the other-chamber intake port 16, the fan casing 9 moves away from the inner peripheral surface 11 of the main body frame 3 as it goes in the rotational direction of the centrifugal blower blade 6. An intake air passage from the other chamber is secured by the flat portion 10 of the fan casing 9 having a shape.

  As described above, according to the ceiling-embedded ventilation fan of the fifth embodiment, the other-room intake port 16 is provided in the vicinity of the flat surface portion 10 of the side surface portion 7 of the fan casing 9 so In the ceiling embedded ventilation fan, noise in the intake air passage from another room can be reduced together.

  The ceiling-embedded ventilation fan according to the present invention includes a fan casing having a scroll shape, and is effective for all ventilation devices that are embedded in a ceiling.

1 is a side sectional view showing a ceiling-embedded ventilation fan according to a first embodiment of the present invention. Bottom view from the inlet side of the ceiling-mounted ventilation fan The principal part enlarged view of the ceiling embedded type ventilation fan of Embodiment 2 of this invention The principal part enlarged view of the ceiling embedded type ventilation fan of Embodiment 3 of this invention The principal part enlarged view of the ceiling embedded type ventilation fan of Embodiment 4 of this invention Sectional side view which shows the ceiling embedded type ventilation fan of Embodiment 5 of this invention Bottom view from the inlet side of the ceiling-mounted ventilation fan Side sectional view of a conventional ceiling-mounted ventilation fan Bottom view from the inlet side of the ceiling-mounted ventilation fan

DESCRIPTION OF SYMBOLS 1 Intake port 2 Exhaust port 3 Main body frame 4 Rotating shaft 5 Electric motor 6 Centrifugal blower blade 7 Side part 8 Orifice 9 Fan casing 10 Plane part 11 Inner peripheral surface 12 Sound absorbing material 13 Uneven shape 14 Outer wall 15 Exhaust duct 16 Inlet for other chamber

Claims (5)

A box-shaped main body frame having an intake port with a lower surface opened and an exhaust port on a side surface; and a centrifugal blower blade that is rotationally driven by an electric motor provided on the main body frame with a rotation axis in a vertical direction; A scroll-shaped side surface surrounding the outer periphery of the centrifugal blower blade, and a fan casing having a lower surface portion having an orifice serving as a suction port, and the fan casing has the side surface at the center of the centrifugal blower blade. The portion opposite to the exhaust port is formed in a flat portion with respect to the exhaust port, and the flat portion is configured to move away from the inner peripheral surface of the main body frame as it goes in the rotation direction of the centrifugal blower blade. there are, ceiling type ventilating fan being characterized in that attached the sound absorbing material on the inner surface of the flat portion of the side surface portion. A box-shaped main body frame having an intake port with a lower surface opened and an exhaust port on a side surface; and a centrifugal blower blade that is rotationally driven by an electric motor provided on the main body frame with a rotation axis in a vertical direction; A scroll-shaped side surface surrounding the outer periphery of the centrifugal blower blade, and a fan casing having a lower surface portion having an orifice serving as a suction port, and the fan casing has the side surface at the center of the centrifugal blower blade. The portion opposite to the exhaust port is formed in a flat portion with respect to the exhaust port, and the flat portion is configured to move away from the inner peripheral surface of the main body frame as it goes in the rotation direction of the centrifugal blower blade. there are, ceiling type ventilating fan, characterized in that a concavo-convex shape on the planar portion of the side surface portion. A box-shaped main body frame having an intake port with a lower surface opened and an exhaust port on a side surface; and a centrifugal blower blade that is rotationally driven by an electric motor provided on the main body frame with a rotation axis in a vertical direction; A scroll-shaped side surface surrounding the outer periphery of the centrifugal blower blade, and a fan casing having a lower surface portion having an orifice serving as a suction port, and the fan casing has the side surface at the center of the centrifugal blower blade. The portion opposite to the exhaust port is formed in a flat portion with respect to the exhaust port, and the flat portion is configured to move away from the inner peripheral surface of the main body frame as it goes in the rotation direction of the centrifugal blower blade. there are, on the outside of the flat portion, ceiling type ventilating fan, characterized by comprising an outer wall composed of a double structure via the flat portion and the space. The ceiling-embedded ventilation fan according to claim 1 or 2, wherein an outer wall having a double structure is provided outside the flat portion through a space with the flat portion. A box-shaped main body frame having an intake port with a lower surface opened and an exhaust port on a side surface; and a centrifugal blower blade that is rotationally driven by an electric motor provided on the main body frame with a rotation axis in a vertical direction; A scroll-shaped side surface surrounding the outer periphery of the centrifugal blower blade, and a fan casing having a lower surface portion having an orifice serving as a suction port, and the fan casing has the side surface at the center of the centrifugal blower blade. The portion opposite to the exhaust port is formed in a flat portion with respect to the exhaust port, and the flat portion is configured to move away from the inner peripheral surface of the main body frame as it goes in the rotation direction of the centrifugal blower blade. there are, in the ceiling-embedded-type ventilating fan provided with another compartment air inlet for intake air through the exhaust duct air from the other chamber on the side surface of the body frame, the other compartment inlet Fanke Ceiling type ventilating fan, characterized in that provided in the vicinity planar portion of the single side surface portion.

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