JP2001272073A - Ventilation fan for duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drain condensed water formed in a main body case and prevent condensed water retained in a duct, rain blown into a duct from the outdoors or the like from falling into a room through the main body case. SOLUTION: A ventilation fan for a duct is provided with a duct joint part 8 in an exhaust opening 7 formed in a side face of the main body case 2, and discharges air sucked through a suction opening 5 of the main body case 2 into the case by rotation of a fan 9 outdoors through the duct joint part 8. The duct joint 8 is provided with a shutter 13 pivoted at its top end, and has a contact face 14 to be disposed in contact with a peripheral part of the shutter 13. A bottom face A extending from the contact face 14 of the joint 8 toward the exhaust opening side 7 is disposed higher than a bottom end of the shutter 13 at the time of being in contact with the contact face 14. Thus, condensed water retained in the duct, rain blown into the duct from outdoors or the like between the bottom face of the shutter in contact with the contact face and the bottom of the contact face is surely prevented from flowing back in-between.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct ventilation fan for exhausting room air to the outside through a duct.

[0002]

2. Description of the Related Art Conventionally, as a ventilation fan for this kind of duct,
JP-A-10-141732 (F24F7 / 10)
The following are known.

As shown in FIGS. 4 to 6, this duct ventilation fan 1 is provided with a suction port 5 below a main body case 2 which is mounted so as to protrude from a ceiling, and is covered with a duct connection portion 8 on the side. An exhaust port 7 is provided, and a fan 9 surrounded by a fan casing 10 is provided in the main body case 2.
Is provided. A driving motor 3 is covered with a cover 4. Further, an exhaust passage 12 communicating the exhaust port 7 and the duct 11 is formed in the duct connection portion 8, and an upper end is pivotally supported in the middle of the exhaust passage 12,
The shutter 13 is opened by the wind pressure of the fan 9, and a rib-shaped contact surface 51 to which the peripheral edge of the shutter 13 contacts when the fan 9 is stopped by the wind from the outside.

[0004] With the above configuration, as shown in FIG.
Of the fan casing 1 from the intake hole 10a formed in the bottom surface of the fan casing 1
After the air flows into the exhaust port 7, the air is exhausted toward the exhaust port 7, and the wind pressure opens the shutter 13 in the duct connection portion 8,
The air is exhausted outside through a duct 11 connected to the duct connection portion 8. Then, when the fan 9 is stopped, FIG.
As shown in FIG. 2, the air blown from outside through the duct 11 causes the shutter 13 to abut on the contact surface 14 to close the exhaust passage 12, and the wind blown from outside causes the main body case 2.
It prevents entry into the room through the inside.

The bottom surface of the fan casing 10 has an intake hole 10a opened at a position higher than the bottom surface of the fan casing 10, and the bottom surface of the fan casing 10 is formed higher than the exhaust port 7. The water condensed in the fan casing 10 when the
It is prevented from dropping into the room through Oa and drained smoothly toward the exhaust port 7.

The bottom surface of the duct connecting portion 8 is formed with a notch 52 (see FIG. 6) at the lower end of the contact surface 51 so that the lower surface is lower than the exhaust port 7 and lower toward the duct 11. As shown in FIG. 4, the condensed water collected on the bottom surface of the fan casing 10 can be smoothly drained from the exhaust port 7 toward the duct 11.

However, by forming the notch 52 so that the dew condensation water in the fan casing 10 can be drained smoothly, the lower end of the shutter 13 and the notch 52 are provided as shown in FIG. Since the gap 53 is formed, as shown in FIG. 5, when the wind blows from outside, the rain blown into the duct 11 from outside and the dew condensation water stagnated in the duct 11 are pushed by the wind pressure, and the notch 52 and the shutter 13 and flowed back into the fan casing 10 through the gap 53. When the amount of backflowing rain or dew water increases, it falls over the periphery of the intake hole 10a and falls into the room, thereby soiling the room or giving discomfort when hitting a person in the room. Was.

[0008]

SUMMARY OF THE INVENTION The present invention is capable of draining dew condensation water generated in a main body case, and condensing water stagnated in a duct or rain blown into a duct from the outside into a room through a main body case. An object of the present invention is to provide a ventilation fan for a duct that can prevent the fan from falling.

[0009]

Means for Solving the Problems A first method for solving the above problems is described below.
Means for providing a duct connection portion at an exhaust port formed on a side surface of the main body case, and a duct for exhausting air sucked into the main body case from an intake port of the main body case by rotation of a fan to the outside through the duct connection portion. In the ventilation fan, the duct connection portion is provided with a shutter whose one end is pivotally supported, and a contact surface with which the peripheral edge of the shutter is in contact is formed, and the exhaust port side is closer to the contact surface of the duct connection portion. Is positioned above the lower end of the shutter when it is brought into contact with the contact surface.

Thus, when the shutter comes into contact with the contact surface, there is no gap between the shutter and the bottom surface on the exhaust port side from the contact surface of the duct connection portion, and the shutter is blown into the duct from outside. The lower end of the shutter and the lower portion of the abutment surface can reliably prevent the rainwater and the condensed water stagnated in the duct from being pushed back by the wind pressure from the outside and flowing backward to the main body.

In the above configuration, it is preferable that the bottom surface of the duct connection part is formed so as to be entirely lower from the exhaust port side to the duct side.

[0012] Thus, it is possible to easily drain the condensed water generated in the fan casing to the outside via the duct connection portion.

More specifically, the shutter is rotated by wind pressure from a fan.

Thus, the shutter can have a simple structure.

The shutter is pivotally supported at the upper end.

Thus, the shutter can be closed by its own weight, and the shutter can be more reliably brought into contact with the contact surface.

Further, the shutter may be pivotally supported on a side surface.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show an example of a ventilation fan for a duct as an embodiment of the present invention, and will be described below with reference to these drawings.

Reference numeral 1 denotes a duct ventilation fan (hereinafter referred to as a main body) which is mounted so as to protrude from the ceiling, and which is detachable so as to cover a box-shaped main body case 2 having an open lower portion and a motor 3 mounted on the upper surface of the main body case 2. An outer shape is formed from the cover 4 and the outer cover.

A grill 6 having an intake port 5 is detachably provided in an opening 2a at a lower portion of the main body case 2, and air in the room where the main body 1 is installed is supplied from the intake port 5 to the main body case 2. It is sucked in. An exhaust port 7 communicating with the intake port 5 is formed on the side surface, and a duct connecting portion 8 is provided detachably so as to cover the exhaust port 7.

In the main body case 2, a fan 9 driven by the motor 3 is provided so as to be surrounded by a fan casing 10 having an intake hole 10a on the bottom surface. In the fan casing 10, the peripheral edge of the intake hole 10 a is formed higher than the bottom surface of the fan casing 10, and the bottom surface of the fan casing 10 is inclined higher than the bottom of the exhaust port 7 and lower toward the exhaust port 7. This makes it difficult for the condensed water generated in the fan casing 10 due to the rotation of the fan 9 to drop from the intake hole 10a,
It is easy to drain toward.

In the duct connecting portion 8, an exhaust port 7 is provided.
An exhaust passage 12 communicating with the inside of the duct 11 connected to the duct connection portion 8 is formed. In the exhaust passage 12, a shutter 13 pivotally supported at the upper end by the duct connection portion 8 and being pushed up and opened by the wind pressure of the exhaust air from the fan 9 is provided, and a peripheral edge of the shutter 13 abuts when the fan 9 stops. A contact surface 14 is formed. The lower portion of the contact surface 14 is formed with a step A that makes the bottom surface A on the exhaust port 7 side and the bottom surface B on the duct 11 side higher than the contact surface 14 of the exhaust passage 12 higher than the bottom surface A on the exhaust port 7 side. The step prevents the dew water generated in the fan casing 10 from being blocked.

A bottom surface A on the exhaust port 7 side and a bottom surface B on the duct 11 side from the contact surface 14 of the exhaust passage 12 are inclined so as to be lower than the exhaust port 7 and lower toward the duct 11. Condensation water generated in the casing 10 is smoothly drained to the duct 11 via the bottom surface of the exhaust passage 12 in the duct connection portion 8 and is drained outdoors.

In the duct ventilation fan having the above-described structure, the fan 9 is rotated by the motor 3, as shown in FIG.
The air sucked into the fan casing 10 from the intake hole 10a is exhausted to the exhaust port 7. The shutter 13 is pushed up and opened by the wind pressure of the exhaust air, and the air in the room is exhausted outside through the duct 11.

At this time, moisture in the air sucked from the intake port 5 in the fan casing 10 is condensed and adheres to the inner surface of the fan casing 10. The condensed water flows from the bottom surface of the fan casing 10 to the exhaust port 7 due to the inclination of the fan casing 10. Since the lower portion of the exhaust port 7 is lower than the bottom surface of the fan casing 10, the dew water flows into the duct connection portion 8 without being blocked.

The dew water flowing into the duct connection part 8 is
The bottom surface A on the exhaust port 7 side from the contact surface 14 in the duct connection portion 8
And, due to the inclination of the bottom surface B of the duct side 11, the water is smoothly drained to the duct 11 and drained from the duct 11 to the outside. At this time, since the lower portion of the contact surface 14 is formed in a step that makes the bottom surface A on the exhaust port 7 side higher than the contact surface 14 in the duct connection portion 8, the condensed water is blocked by the step. Without draining to the duct 11.

When the fan 9 for the duct is stopped, the shutter 13 pivots downward by its own weight and is brought into contact with the contact surface, thereby closing the exhaust passage 12.
The wind blown into the duct 11 from outside is prevented from blowing into the room via the main body case 2.

The lower portion of the contact surface 14 has a step which makes the bottom surface A on the exhaust port 7 side higher than the contact surface 14 in the duct connection portion 8 higher than the bottom surface B on the duct 11 side from the contact surface 14. On the other hand, the lower end of the shutter 13 is connected to the exhaust port 7.
Since it is positioned lower than the bottom surface A on the side, there is no gap between the bottom surface A on the exhaust port 7 side of the contact surface 14 and the shutter 13.

Therefore, as shown in FIG. 2, wind blows into the duct 11 from outside, and the rain or stagnant dew water blown into the duct 11 flows backward from the duct 11 toward the main body 1 due to wind pressure. Can be prevented from falling into the room through the main body 1 and soiling the room, or giving uncomfortable feeling to people in the room.

In the above embodiment, the shutter 13 is of a wind pressure type that is rotated by wind pressure, and has a simple configuration. However, a shutter that is opened and closed by a motor may be used.

It is desirable that the shutter 13 be pivotally supported at the upper side and be brought into contact with the contact surface by its own weight. However, the side surface may be pivotally supported.

[0032]

According to the first aspect of the present invention, there is no gap between the lower end of the shutter in contact with the contact surface and the bottom surface on the exhaust port side from the contact surface. The lower portion of the abutment surface can reliably prevent rain blown into the duct from outside or dew condensation stagnated in the duct from flowing backward due to wind pressure from outside. Therefore, it is possible to prevent the rain or dew condensation water from dropping into the room and contaminating the room, or giving uncomfortable feeling to people in the room.

According to the second aspect of the present invention, the dew water generated in the fan casing and flowing into the duct connection portion can be drained smoothly.

According to the third aspect of the present invention, since the shutter can be rotated by the wind pressure, the shutter can have a simple structure, and the cost can be reduced.

According to the fourth aspect of the present invention, since the shutter can be reliably brought into contact with the contact surface by closing the shutter by its own weight, the lower end of the shutter and the lower portion of the contact surface allow the shutter to enter the duct from outside. It is possible to more reliably prevent the blown rain and the dew condensation accumulated in the duct from flowing backward due to wind pressure from the outside.

According to the fifth aspect of the present invention, rain blown into the duct from outside or dew condensation water stagnated in the duct from outside can be removed from the outside by the lower end of the shutter pivotally supported on the side and the lower portion of the contact surface. Backflow can be reliably prevented by the wind pressure.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a duct ventilation fan according to an embodiment of the present invention when a fan is driven.

FIG. 2 is a front sectional view when the fan of the ventilation fan for the duct is stopped.

FIG. 3 is a right side view of the duct ventilation fan.

FIG. 4 is a front sectional view of a conventional duct ventilation fan when a fan is driven.

FIG. 5 is a front cross-sectional view when the fan of the duct ventilation fan is stopped.

FIG. 6 is a right side view of the ventilation fan for the duct.

[Explanation of symbols]

2 Body case 5 Inlet 7 Exhaust 8 Duct connection 9 Fan 13 Shutter 14 Abutment surface A Bottom of exhaust connection side from abutment surface of duct connection

Claims (5)

[Claims] 1. A duct connection portion is provided at an exhaust port formed on a side surface of a main body case, and air sucked into the main body case from an intake port of the main body case by rotation of a fan is exhausted outside through the duct connection portion. In the duct ventilation fan, a shutter whose one end side is pivotally supported is provided at the duct connection portion, and a contact surface with which a peripheral edge of the shutter is contacted is formed. A ventilation fan for a duct, characterized in that a bottom surface on the side is located above a lower end of a shutter when the shutter comes into contact with the contact surface. 2. A ventilation fan for a duct, wherein the bottom surface of the duct connection part is formed so as to be entirely lower from the exhaust port side to the duct side. 3. The shutter according to claim 1, wherein the shutter is rotated by wind pressure from a fan.
Ventilation fan described in. 4. The duct ventilation fan according to claim 1, wherein the shutter is pivotally supported at an upper end side. 5. The ventilation fan for a duct according to claim 1, wherein the shutter is pivotally supported on a side surface.