JP3073838B2 - 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 ceiling ventilation fan disposed behind a ceiling of a room such as a bathroom.

[0002]

2. Description of the Related Art Recently, ventilation fans for ceilings have been used for ventilation of humid rooms such as bathrooms and home steam sauna rooms. Hereinafter, a conventional configuration in which a ceiling ventilation fan is arranged behind the ceiling of a bathroom will be described with reference to FIG.

[0003] That is, a body case 2 is placed above the ceiling 1 of a bathroom.
Are arranged. A motor 3 is mounted on the upper plate 2a of the main body case 2, and an upper half of the motor 3 is exposed on the ceiling back 1, and an impeller (not shown) is mounted on a rotating shaft 3a of the motor 3. Installed. When the motor 3 is energized and the impeller rotates, the air in the bathroom is sucked into the main body case 2 through an opening on the lower surface thereof, and discharged outside through a duct (both not shown) from an exhaust port. Is done.

[0004]

In the above-mentioned use situation, when moisture in the bathroom is sucked into the main body case 2, a part of the moisture is transferred to the bearing 3b supporting the rotating shaft 3a of the motor 3 and the bearing 3b. The motor 3 penetrates into the motor 3 from between the supporting portion 3c that supports the motor 3b.

By the way, since the lower half of the motor 3 located in the main body case 2 is heated by the air from the bathroom,
The air inside the motor 3 becomes relatively hot. On the other hand, the upper half of the motor 3 is exposed at the ceiling 1 and has a lower temperature than the inside of the motor 3. For this reason, especially in winter, a remarkable difference occurs between the temperature inside the motor 3 and the temperature inside the ceiling 1.
Condensation may form on the upper surface inside. Then, the condensed water drops on the windings and the connection portions in the motor 3 to deteriorate the insulation, so that the life of the motor 3 is shortened.

SUMMARY OF THE INVENTION 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 dew condensation from occurring even when moisture enters the motor.

[0007]

In the ceiling ventilation fan of the present invention, a main body case having an opening on a lower surface and an exhaust port on a side surface is arranged behind a ceiling of a room, and is protruded into the main body case. A concave portion is provided in the upper plate portion of the main body case, and a lid is formed to close the upper opening of the concave portion and form a storage chamber together with the concave portion, and correspond to the intake port and the exhaust port corresponding to the opening of the main body case. A fan casing having a discharge port is disposed in the main body case, a motor is mounted in the recess so that at least an upper portion is disposed in the storage chamber, and a rotation shaft of the motor is positioned in the fan casing. Attach the impeller , the storage room and the ceiling
And a first ventilation hole for communicating with
A second communication between the interior of the motor and the storage chamber;
A vent is formed in the motor .

[0008]

[0009]

According to the above means, at least the upper of the motor is disposed in the housing chamber, since there is no portion exposed to the ceiling, the air in the motor is cooled by the ceiling of the air Absent. In addition , the inside of the storage room is affected by the temperature inside the main body case via the peripheral wall of the concave portion and the temperature behind the ceiling via the lid. Temperature. Therefore, even if moisture enters the inside of the motor, the condensation of the moisture inside the motor can be prevented as much as possible. In addition, a first vent on the lid
Forming a hole, and forming a second ventilation hole in the motor;
Communication between the inside of the motor and the ceiling
Moisture that has penetrated into the part, the first vent from the second vent
Through the ceiling. Because of this, moisture
Since it is prevented from staying inside the motor,
The occurrence of dew condensation at the portion is more effectively prevented.

[0010]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. An opening 13 is formed in a ceiling plate 12 of a bathroom 11 as a room, and a mounting frame 15 is attached to a periphery of the opening 13 from the ceiling back 14 side. On the other hand, an opening 16a corresponding to the opening 13 is formed on the lower surface of the metal main body case 16, and a flange 16b is provided on the periphery of the opening 16a. The main body case 16 is disposed on the ceiling back 14 of the bathroom 11 by screwing the flange portion 16b to the ceiling plate 12 and the mounting frame 15 from the bathroom 11 side.

An exhaust port 16c is provided on the side of the main body case 16.
Are formed. A connection pipe 18 having a shutter 17 of an open air pressure type is attached to the periphery of the exhaust port 16c, and a duct 19 led to the outside is connected to the connection pipe 18. Further, a concave portion 16e projecting into the main body case 16 is provided integrally with the upper plate portion 16d of the main body case 16 by, for example, drawing, and an upper surface opening of the concave portion 16e is screwed to the upper plate portion 16d. Is closed by the cover 20. The storage chamber 21 is formed by being surrounded by the recess 16 e and the lid 20, and the lid 20 is provided with a plurality of first ventilation holes 20 a that allow the storage chamber 21 and the ceiling back 14 to communicate with each other. Have been.

A fan casing 22 is provided in the main body case 16. A lower suction port 22a corresponding to the opening 16a of the main body case 16 is formed on the lower surface of the fan casing 22, and a discharge port 22b corresponding to the exhaust port 16c of the main body case 16 is formed on the side surface. An upper suction port 23 is formed between the fan casing 22 and the concave portion 16e, and a flow path 24 is formed between the fan casing 22 and a side surface of the main body case 16.

An opening 16f is formed in the recess 16e, and a flange 25a of the motor 25 is mounted so as to be inserted into the opening 16f. Thereby, the lower half of the motor 25 is arranged in the fan casing 22, and the upper half is arranged in the storage room 21.
The upper surface of the motor 25 is provided with a plurality of second ventilation holes 25b for communicating the inside of the motor 25 with the storage chamber 21. Further, a double suction type impeller 26 is attached to the rotation shaft 25 c of the motor 25.
Are located in the fan casing 22.

The lower end of the rotating shaft 25c of the motor 25 is inserted and supported by a bearing 25e made of, for example, a sintered metal received and supported by a support 25d. A decorative frame 27 is attached to the main body case 16 via a spring member 28 so as to cover the opening 16a from the bathroom 11 side.

Next, the operation of the above configuration will be described.

When the motor 25 is energized and the impeller 26 rotates, the air in the bathroom 11 is sucked into the main body case 16 from the opening 16a. And most of that air is
After being sucked into the fan casing 22 from the lower suction port 22a and passing through the discharge port 22b and the exhaust port 16c,
While opening the shutter 17 as shown by the two-dot chain line,
The air is discharged outside through the duct 19. On the other hand, the opening 16
A part of the air sucked into the main body case 16 from the a through the flow path 24 is drawn into the fan casing 22 from the upper suction port 23, passes through the discharge port 22 b and the exhaust port 16 c, and then passes through the duct 19. Released outside through

According to the above embodiment, the following effects can be obtained. That is, the upper half of the motor 25 is disposed in the storage room 21,
Since the lower half is disposed in the fan casing 22, there is no portion exposed to the ceiling 14 and, therefore, the air inside the motor 25 is not cooled by the relatively low temperature air in the ceiling 14. In this case, the inside of the motor 25
The temperature is substantially equal to the temperature inside the main body case 16,
The inside of the storage room 21 is affected by the temperature inside the main body case 16 via the peripheral wall of the concave portion 16e and the temperature inside the ceiling 14 via the lid 20, so that the temperature inside the motor 25 and the temperature inside the ceiling And a temperature between 14.

Therefore, particularly when the temperature of the ceiling 14 is extremely low, such as in winter, the bearing 25c and the support 25d
Even if a part of the moisture enters the motor 25 from the gap between the housing 25 and the motor 25, the storage chamber 21 performs a temperature buffer, and the moisture is prevented from being condensed on the upper surface of the motor 25 as much as possible. it can. As a result, insulation deterioration of the motor 25 due to condensation can be prevented, and the life of the motor 25 can be extended.

Furthermore, a first ventilation hole 20a is formed in the lid 20, a second ventilation hole 25b is formed in the motor 25, and the inside of the motor 25 and the ceiling 14 are communicated with each other. The infiltrated moisture escapes from the second ventilation hole 25b to the ceiling floor 14 through the first ventilation hole 20a. As a result, moisture does not stay inside the motor 25, and the occurrence of dew condensation can be more effectively prevented.

In the above embodiment, the upper half of the motor 25 is disposed in the storage chamber 21.
5 may be arranged in the storage room 21.
5, at least the upper part may be arranged in the storage room 21. In addition, the present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

[0022]

As apparent from the foregoing description, according to the ceiling ventilators of the present invention, a concave portion is provided on the upper plate of the body case, a lid for closing the upper opening of the concave portion is provided, the motor Since the motor is mounted in the recess and at least the upper portion of the motor is arranged in the storage chamber formed by the recess and the lid, it is possible to prevent the moisture that has entered the motor from dew condensation as much as possible. As a result, insulation deterioration of the motor can be prevented, and the life of the motor can be prolonged. In addition, since the first ventilation hole is formed in the lid and the second ventilation hole is formed in the motor, it is possible to more effectively prevent dew condensation from occurring inside the motor.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing a conventional example.

[Explanation of symbols]

11 is a bathroom (room), 14 is a ceiling, 16 is a main body case, 16a is an opening, 16c is an exhaust port, 16d is an upper plate,
16e is a concave portion, 20 is a lid, 20a is a first vent, 21
Is a storage room, 22 is a fan casing, 22a is a suction port,
22b is a discharge port, 25 is a motor, 25b is a second vent, and 26 is an impeller.

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-1-208640 (JP, A) JP-A-4-85042 (JP, U) JP-A-61-10041 (JP, U) JP-A-62-1 95223 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 7/10 101

Claims (1)

(57) [Claims] 1. A main body case having an opening on a lower surface and an exhaust port on a side surface, which is disposed behind a ceiling of a room, and a concave portion provided on an upper plate portion of the main body case so as to protrude into the main body case. A lid that closes the upper opening of the recess to form a storage chamber together with the recess, and a suction port that is disposed in the main body case and corresponds to the opening of the main body case and the discharge port that corresponds to the exhaust port. A fan casing, a motor attached to the concave portion, at least an upper part of which is arranged in the storage chamber, and an impeller attached to a rotation shaft of the motor and arranged in the fan casing ,
The lid is placed in communication with the storage room and the ceiling.
A first ventilation hole is formed, and the motor has
A second ventilation hole is formed for communicating the portion with the storage chamber.
A ceiling ventilation fan characterized by being made .