JP2543250B2 - Ceiling embedded ventilation fan - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling-embedded ventilation fan used for ventilation and ventilation equipment.

2. Description of the Related Art In recent years, there has been an increasing demand for reducing noise of ventilation blowers used in homes. As shown in FIGS. 6 and 7, a conventional ceiling-embedded ventilation fan of this type has a box-shaped main body 20 with an open lower surface, a spiral casing 22 surrounding the impeller 21, and a suction port 23. Suction casings 25 and 26 having Nos. 24 and 24, an electric motor 27 attached to the suction casing 25 or 26 and having the impeller 21 fixed thereto, and a grill 28 provided on the lower surface of the main body 20.

With the above configuration, when the impeller 21 is rotated by the electric motor 27 during operation, air is sucked from the suction ports 23 and 24, the pressure is increased by the impeller 21, and the air is discharged from the discharge port 29 through the inside d of the spiral casing 22. Further, the air sucked from the suction ports 23 and 24 has the rotational noise generated when the pressure is increased by the impeller 21 and the turbulent noise due to the vortex generated when passing through the spiral casing 22. Was radiated to the space c through the suction side spaces a and b.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In such a conventional ceiling-embedded ventilation fan, rotational noise generated when the pressure of the air sucked by the rotation of the impeller 21 is increased during operation, and when passing through the spiral casing 22. There is a problem in that turbulent noise due to the generated vortex is radiated to c through the suction side spaces a and b of the suction ports 23 and 24.

The present invention is to solve the above problems, and a part of the noise generated by the rotation of the impeller and the noise generated by the spiral casing is shielded, and the radiation to the outside of the main body can be reduced. The first purpose is to provide.

A second object is to provide a ceiling-embedded ventilation fan capable of absorbing and reducing part of the noise generated by the rotation of the impeller and the noise generated by the spiral casing in the main body.

Means for Solving the Problems In order to achieve the first and second objects, the ceiling-embedded ventilation fan according to the present invention has a box shape in which a lower surface is opened as a first means and a discharge port is provided on one side surface. A main body of the main body, an exhaust blower having an intake opening communicating with the discharge opening, and an air flow path space section are provided inside the main body, and a vent hole communicating with the air flow path space section and an opening in the lower surface of the main body. An extended blind cover panel provided with a blind cover part for blinding the entire exhaust blower and an extended blind cover part that is formed by bending and extending the end part of the vent hole on the blind cover side toward the inside of the main body, A sound absorbing material is attached to a part or all of the inside of the blind portion and the extended blind portion.

As a second means, a structure is provided in which a part of the extended blind portion of the first means is provided with an opening communicating with the air passage space portion, and a sound absorbing material is attached to the inside of the extended blind portion. Is.

With the ceiling-embedded ventilation fan of the present invention, part of the noise generated in the rotation of the impeller or in the spiral casing is shielded by the extended blinding panel by the configuration of the above-mentioned first means and second means, and is transmitted to the outside of the main body. It reduces the amount of noise radiation. Further, a part of the noise generated in the rotation of the impeller and in the spiral casing is reduced by the sound absorbing material in the main body.

Example Hereinafter, a first example of the present invention will be described with reference to FIGS. The same parts as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in the figure,
An exhaust blower composed of an electric motor 27 to which an impeller 21 is fixed and an air flow passage space portion 1 are provided in a main body 20, and a vent hole 2 communicating with the air flow passage space portion 1 is provided on a lower surface of the main body 20. A part or the whole of the exhaust blower is vertically shielded from the lower surface by a blind portion 3 and an extension blind portion 4 extending from the end of the blind portion 3 to the inside of the main body 20 is bent by a right angle portion 5. The extended blind cover panel 6 and the sound absorbing material 7 attached to the inside of the extended blind cover portion 4 of the extended blind cover panel 6.
Is provided.

With the above configuration, when the impeller 21 rotates, the suction air flows into the inside of the main body 20 through the ventilation port 2 and the impellers through the suction ports 23 and 24 of the suction casings 25 and 26.
Entering 21 and boosted by this impeller 21, spiral casing
It is discharged from the discharge port 29 through the inside d of 22. At this time, the rotational noise generated when the pressure is increased by the impeller 21 and the turbulent noise caused by the vortex generated when passing through the spiral casing 22 are passed from the suction ports 23 and 24 through the suction side spaces a and b to the main body 20. It is radiated so as to spread to the outside e, but because of the blind portion 3 in the extended blind panel 6, a part of noise is radiated to the sound-insulated space c. Further, part of the noise is absorbed by the sound absorbing material 7 inside the extended blind portion 4, and the noise from the space e is reduced.

Next, the second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to the drawings. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. As shown in FIG. 4 and FIG. 5, openings 8 are provided at several positions of the extended blind cover 4 of the extended blind cover panel 6 provided on the lower surface and the lower surface of the main body 20 which is opened, and the sound absorbing material is provided inside thereof. I'm sticking.

With the above configuration, the rotational noise generated by the rotation of the impeller 21 and the turbulent noise caused by the vortex generated when the air passes through the spiral casing 22 spread from the ventilation port 2 to the outside e of the main body 20. Part of the noise is absorbed by the sound absorbing material 7 stretched inside the extended blind portion 4, and the noise from the space e is reduced. Further, since the sound absorbing material 7 is exposed to the air flow passage space portion 1 due to the opening portion 8 in the extended blind portion 4, noise is transmitted through the air flow passage space portion 1 and the ventilation port 2. A part of the noise is absorbed even when it is radiated into the space.

By forming the right-angled portion 5 of the first and second embodiments into an arc-shaped bent portion (not shown), pressure loss is reduced and the area of the vent hole 2 can be reduced, so that sound can be further insulated. .

EFFECTS OF THE INVENTION As is clear from the above examples, according to the present invention,
It is possible to provide a ceiling-embedded ventilation fan capable of extremely reducing noise emission to the outside of the main body by a synergistic effect of a sound absorbing effect and a sound insulating effect.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a ceiling-embedded ventilation fan according to a first embodiment of the present invention, FIG. 2 is a front view of the ceiling-embedded ventilation fan, and FIG. 3 is a ceiling-embedded ventilation fan with different positions of the exhaust blower. 4 is a vertical sectional view of the ventilation fan, FIG. 4 is a vertical sectional view of the ceiling-embedded ventilation fan according to the second embodiment of the present invention, and FIG. 5 is a side sectional view of the ceiling-embedded ventilation fan.
FIG. 6 is a vertical sectional view of a conventional ceiling-embedded ventilation fan, and FIG. 7 is a front view of the ceiling-embedded ventilation fan. 1 ... Air flow path space part, 2 ... Vent hole, 3 ... Blind part, 4 ... Extended blind part, 6 ... Extended blind panel, 7 ... Sound absorbing material, 8 ... Opening part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-58-203528 (JP, A) Actually opened 57-95527 (JP, U) Actually opened 55-46165 (JP, U)

Claims (2)

(57) [Claims] 1. A box-shaped main body having a bottom surface opened and a discharge port provided on one side surface, an exhaust blower having an intake port communicating with the discharge port, and an air flow path space portion are provided inside the main body. A ventilation hole communicating with the air flow path space portion in the lower surface opening of the main body, a blinding portion for blinding the entire exhaust blower vertically from the lower surface, and an end portion of the ventilation opening on the blinding portion side. An embedded blind cover panel provided with an extended blind cover part that is bent and extended inside the main body, and is embedded in the ceiling by attaching a sound absorbing material to part or all of the inside of the blind cover part and the extended blind part. Shaped ventilation fan. 2. The ceiling-embedded ventilation fan according to claim 1, wherein an opening communicating with the air passage space is provided in a part of the extended blind portion, and a sound absorbing material is attached to the inside of the extended blind portion.