JPH11108431A - Ventilation fan for air supply body and duct - Google Patents

Abstract

(57) [Summary] [Problem] An air supply opening body that can suppress the invasion of outside wind,
In addition, by providing the air supply port, a duct ventilation fan excellent in usability is provided. A shutter plate (33) is rotatably provided inside an air supply connection cylinder (22), and an opening area on the suction side of the air supply connection cylinder (22) is provided by a wind shield plate (36). It was configured to be smaller than the area of 33a. When the outside air flows toward the suction side of the air supply connection cylinder 22, the force exerted on the shutter plate 33 by the outside air becomes small, so that the shutter plate 33 rotates in the direction of arrow C in FIG. It does not move, and it is possible to suppress the invasion of unnecessary external wind. On the other hand, when the blower fan is driven to rotate and the discharge side of the air supply connection cylinder 22 becomes negative pressure, the negative pressure causes the shutter plate 33 to rotate in the direction of arrow C in FIG. 39 is opened and outdoor air is supplied to the bathroom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air supply opening in which a shutter plate is rotatably provided inside a cylindrical body, and a ventilation fan for a duct having the air supply opening.

[0002]

FIG. 9 shows a conventional structure of an air supply opening provided in, for example, a ceiling (duct) ventilation fan of a bathroom. In FIG. 9, the air supply connection cylinder 2 of the air supply opening 1 is directed outward (from the left side in FIG. 9) to the outside (the right side in FIG. 9) of the duct ventilation fan. The shutter plate 3 is rotatably housed in the air supply connection cylindrical body 2 by inserting its shaft through the shaft hole 4. ing. In this case, the axis of the shutter plate 3 is located above the center line (indicated by a two-dot chain line P in FIG. 9) of the supply cylinder 2, that is, the center of gravity of the shutter plate 3 is It is below the axis. In addition, an air supply duct 5 that leads to the outdoors is connected to the air supply connection cylinder 2.

The center of gravity of the shutter plate 3 is lower than the axis, so that the shutter plate 3 is always stationary so as to be perpendicular to the center line of the connection cylinder 2 for air supply. Is closed. This prevents the warm air in the bathroom from being discharged outside.

In this configuration, when a blower fan (not shown) on the main body side of the duct ventilation fan is rotationally driven, a negative pressure is generated on the main body side when the degree of sealing of the bathroom is high. 9, the shutter plate 3 is the arrow Q in FIG.
It turns in the direction. As a result, the ventilation path 6 is opened, so that outdoor air is supplied to the main body through the ventilation path 6 and further supplied to the bathroom.

However, in such a conventional device, when wind is blowing outdoors, even if the blower fan is not driven to rotate, the outside air is not supplied to the shutter plate 3.
9 causes the shutter plate 3 to move in the direction indicated by the arrow Q in FIG.
It turns in the direction. In that case, the outside wind will flow into the bathroom through the main body of the duct ventilation fan. Invaded, whereby bathers in the bathroom could feel cold.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an air supply opening capable of suppressing the intrusion of unnecessary external wind, and to provide the air supply opening. Another object of the present invention is to provide a duct ventilation fan which is excellent in usability.

[0007]

The air supply port of the present invention is provided with a cylinder constituting an air passage and rotatably provided inside the cylinder through a pivot. A shutter plate for opening and closing the road, wherein the cylindrical body has an opening area on the suction side smaller than an area of one surface of the shutter plate (claim 1).

According to the air supply opening of the above construction, the opening area on the suction side of the cylindrical body is configured to be smaller than the area of one surface of the shutter plate, so that external air flows toward the suction side of the cylindrical body. In such a case, the force exerted by the outside wind on the shutter plate becomes small. Therefore, the shutter plate does not rotate due to the external wind, and thereby, unnecessary intrusion of the external wind can be suppressed.

In this case, in the air supply port, a wind shield plate may be provided on the cylinder so that the opening area of the cylinder on the suction side is smaller than the area of one surface of the shutter plate. Claim 2).

[0010] In the above-mentioned air supply opening, the center axis is parallel to a plane including the center line of the cylinder, and
Further, the windshield plate may be provided so as to be shifted from the surface, and the wind shield plate may be provided on a side opposite to the pivot with respect to the surface (claim 3).

Further, in the air supply opening, the wind shield plate may be provided to be inclined inward of the cylindrical body so as to guide the external wind to the pivot side of the shutter plate. ).

Further, the air supply port of the present invention is provided with a cylinder constituting an air passage, and is rotatably provided inside the cylinder via a pivot, and the rotation opens and closes the air passage. A shutter plate, wherein the pivot is provided so that its center line is parallel to a plane including the center line of the cylindrical body, and is located at a position shifted from the plane, and the shutter plate is The present invention is characterized in that a concave portion which is located on the opposite side to the surface and is depressed from the suction side to the discharge side of the cylindrical body is provided (Claim 5).

According to the air supply opening of the above construction, the shutter plate is located on the side opposite to the pivot with respect to the plane including the center line of the cylinder, from the suction side to the discharge side of the cylinder. Since a concave recess is provided, when external air flows toward the suction side of the cylindrical body, the force exerted by the external air on the shutter plate is on one side and the other side of the pivot on the shutter plate. And becomes approximately equal. As a result, the shutter plate does not rotate due to the external wind, and the same operation and effect as those of the first aspect can be obtained.

Further, the air supply port of the present invention is provided with a cylinder constituting an air passage, and is rotatably provided inside the cylinder through a pivot, and the rotation opens and closes the air passage. A shutter plate, and a pressure receiving portion provided on the suction side of the cylinder so as to be movable in the axial direction of the cylinder and receiving external wind, and is always at an allowable position allowing rotation of the shutter plate. A moving member that is located at a suppression position that suppresses the rotation of the shutter plate by moving to the discharge side when the pressure receiving portion receives outside air of a predetermined value or more. (Claim 6).

According to the air supply port having the above-described structure, it is always located on the suction side of the cylindrical body at an allowable position where the rotation of the shutter plate is allowed. Since the moving member is located at the restraining position that suppresses the rotation of the shutter plate by moving to the discharge side, the external wind flows toward the suction side of the cylindrical body, and accordingly, the pressure receiving portion is at or above a predetermined pressure. When an external wind is received, the moving member moves to the restraining position, and the rotation of the shutter plate is restrained. Thus, the rotation of the shutter plate is suppressed by the external wind, and the same operation and effect as those of the first aspect can be obtained.

In this case, in the air supply port, the moving member may be formed in a cylindrical shape, and a filter may be provided in the ventilation port.

Further, a duct ventilation fan according to the present invention includes a main body having an air supply port, a blower fan disposed inside the main body and discharging air inside a room to the outside, The air supply port according to any one of claims 1 to 7 is provided, and the air supply port is configured to communicate with the inside of the room (claim 8).

According to the ventilation fan for a duct having the above configuration, the inflow of outside air can be suppressed by the air supply opening. Also,
When the blower fan is driven to rotate, the discharge side of the cylinder at the air supply port becomes negative pressure, and the negative pressure causes the shutter plate to open and rotate, so that air flows through the ventilation path of the cylinder. become. Thus, air can be supplied to the inside of the room.

That is, when wind is blowing outdoors, the ventilation path is closed to prevent the invasion of outside air, and when the blower fan is driven to rotate, the ventilation path is opened. Thereby, air can be supplied to the inside of the room, so that usability can be improved.

In this case, in the duct ventilation fan,
The shutter plate of the air supply opening may be opened and rotated by natural air supply.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, the entire configuration of the duct ventilation fan will be described with reference to FIG.
An opening 12 a is formed in the ceiling 12 of the bathroom 11. The main body 13 is formed by integrally combining a main body upper part 14, a main body lower part 15, and an outer frame body 16.
By being inserted into the opening 12a of the ceiling 12 from one side, it is disposed behind the ceiling 12 (the upper side in FIG. 3).

The main body upper part 14 and the main body lower part 15
Also serves as a fan casing, inside which a blower fan 17 is disposed. Above the blower fan 17, a motor 18 for rotating and driving the blower fan 17 is provided.
Are arranged. In addition, in FIG.
A suction port 19 that opens downward is formed. And
On the left side in FIG. 3 of the main body 13, a discharge port 20 that opens to the side is formed by the main body upper part 14 and the main body lower part 15.

An exhaust connection cylinder 21 is provided on the left side of the main body 13 in FIG. A flange 21a extending outward is integrally formed at a lower portion of the exhaust connection cylinder 21, and fitting portions 14a, 14b protruding above the main body upper portion 14 are formed on the right side. The fitted parts 21b and 21c that fit into are provided integrally.

The exhaust connection cylinder 21 has a flange 21
a is addressed to the lower surface of the ceiling 12 and FIG.
The fixing part 21 is screw-fixed to a mounting frame (not shown) provided at the middle, upper (back side of the ceiling 12) peripheral portion.
The b and 21c are disposed on the back side of the ceiling 12 in a state of being fitted to the fitting portions 14a and 14b of the upper part 14 of the main body.
An exhaust duct (not shown) communicating with the outside is connected to the left side of the exhaust connection cylindrical body 21 in FIG.

An air supply connection cylinder 22 is provided on the right side of the main body 13 in FIG. A flange 22a extending outward is formed integrally with a lower portion of the air supply connection cylinder 22, and the flange 22a of the air supply connection cylinder 22 is directed to the lower surface of the ceiling 12. It is arranged behind the ceiling 12 in a state where it is fixed to the mounting frame by screws. In addition, an air supply duct 23 (see FIG. 1) that communicates with the outside is connected to the right side of the air supply connection cylindrical body 22 in FIG.

In the state where the exhaust connection cylinder 21 and the air supply connection cylinder 22 are arranged on the back side of the ceiling 12, the main body 13 is moved from the opening 12 a of the ceiling 12 to the ceiling 12. Inserted on the back side, and addressed the flange 16a integrally formed below the outer frame 16 to the flange 21a of the exhaust connection cylindrical body 21 and the flange 22a of the air supply connection cylindrical body 22, It is arranged on the back side of the ceiling 12 by being fixed to the mounting frame by screws.

Below the opening 12a of the ceiling 12, a rectangular panel 24 is provided. On the upper surface of the panel 24, a rectangular frame-shaped mounting portion 26 supported by the leg portion 25 and having a concave cross section is provided, and the mounting portion 26 is provided with a flange portion 16a of the outer frame body 16 and an exhaust port. Flange 2 of connection cylinder 21
1a and the flange 22a of the supply cylinder 22 for air supply.

A hook 27 is provided at a predetermined position on the upper surface of the panel 24. A torsion coil spring (not shown) provided at the lower part 15 of the main body is attached to the hook 27. By being hooked, it is urged upward and held.

Further, a partition plate 28 is provided on the lower part 15 of the main body.
Are formed integrally, and the space above the panel 24 is partitioned by the partition plate 28 into the exhaust connection cylinder 21 side and the air supply connection cylinder 22 side. In this case, the gap between the panel 24 and the ceiling 12 on the side of the exhaust connection cylinder 21 is an exhaust port 29 that opens to the side, and the exhaust port 29 is connected to the intake port 19 and the discharge port 20.
In addition, a portion extending to the inside of the exhaust connection cylinder 21 is an exhaust passage 30.

The gap between the panel 24 and the ceiling 12 on the side of the air supply connection cylinder 22 is an air supply port 31 that opens to the side, and air is supplied from the inside of the air supply connection cylinder 22. A portion extending to the air port 31 is an air supply passage 32.
Note that the panel 24 and the ceiling 12 on the side perpendicular to the drawing
Are also defined as the exhaust port 29 and the exhaust passage 30 described above. The lower portion 28a of the partition plate 28 has a curved shape so that air can easily flow when air is supplied.

The air supply port including the air supply connection cylinder 22 will be described in detail with reference to FIGS.
The connection cylinder 22 for air supply has a cylindrical shape whose diameter gradually decreases from the main body 13 side to the outside. Inside the air supply connection cylinder 22, a shutter plate 33 having a shape in which a part of a disk is cut out, and a support rod 34 as a pivot thereof are provided on the air supply connection cylinder 22 side. The tongue piece 35 is rotatably disposed by being inserted into the hole 35a. In this case, the center line of the support rod 34 (indicated by a two-dot chain line A in FIG. 2) includes the center line of the supply cylinder 22 (indicated by a two-dot chain line B in FIG. 1). It is located parallel to the plane and shifted upward from the plane in FIG.
Thus, the center of gravity of the shutter plate 33 is located immediately below the support bar 34.

At the lower end on the suction side of the connection cylinder 22 for air supply, a wind shield plate 36 is set up substantially vertically so as to cover a part of the side surface 33a of the shutter plate 33. I have. In other words, due to the wind shield plate 36, the opening area on the suction side in the air supply connection cylinder 22 is smaller than the area of the side surface 33 a of the shutter plate 33.

A stopper member 37 is provided at a predetermined position on the inner peripheral side of the air supply connection cylinder 22 by being attached to a support member 38. In this case, the shutter plate 33
As described above, since the center of gravity is located immediately below the rotation axis, the shutter plate 33 is always stationary in the vertical direction in the axial direction of the air supply connection cylinder 22. Is in contact with the stopper member 37.

As a result, the shutter plate 33 is
It is forbidden to rotate in the direction opposite to arrow C. The inside of the air supply connection cylinder 22 is formed as an air passage 39 through which air flows, and the air passage 39 is opened and closed according to the rotation of the shutter plate 33. In FIG. 3, the shutter plate 33 and the like are omitted.

Next, the operation of the above configuration will be described.
In the above configuration, when the blower fan 17 is driven to rotate by the motor 18, the air in the bathroom 11 is sucked into the main body 13 through the exhaust port 29 and the suction port 19 from the direction along the ceiling 12, and 20, the air is discharged outside through the exhaust connection cylinder 21 and the inside of the exhaust duct (see arrow D in FIG. 3). In addition, since the inside of the bathroom 11 becomes negative pressure according to this exhaust,
The shutter plate 33 in the supply cylinder 22 is shown in FIG.
In the middle, it turns in the direction of arrow C, that is, the air passage 39 is opened. Thereby, the outdoor air is sucked into the air supply passage 32 through the air supply duct 23 and the ventilation path 39, and is supplied into the bathroom 11 through the air supply port 31 (see arrow E in FIG. 3).

Now, consider the case where the wind is blowing outdoors. Now, when the blower fan 17 is not driven to rotate and the shutter plate 33 is stationary in the vertical direction in the axial direction of the connection cylinder 22 for air supply, when outside air flows into the air supply duct 23, The outside wind is supplied to the shutter plate 33
And the windshield 36. At this time, when the external wind hits the wind shield plate 36, the force exerted by the external wind on the lower portion of the shutter plate 33 is reduced, so that the shutter plate 33 is rotated in the direction of arrow C in FIG. No, the ventilation path 3 of the connection cylinder 22 for air supply
9 will not be released.

In this case, as described above, the center of gravity of the shutter plate 33 is directly below the support rod 34, and the upper portion thereof is in contact with the stopper member 37.
As a result, the shutter plate 33 is moved by the outside wind in FIG.
It does not rotate in the direction indicated by the arrow C, and this also prohibits the opening of the ventilation path 39 of the supply cylinder 22.

As described above, according to the first embodiment, the shutter plate 33 is rotatably provided inside the supply cylinder 22.
Since the opening area on the suction side of the air supply connection cylinder 22 is smaller than the area of the side surface 33a of the shutter plate 33 by the wind shield plate 36, the air supply connection cylinder 2
When the outside wind flows toward the suction side of No. 2, the force exerted on the shutter plate 33 by the outside wind becomes small. Thus, it is possible to prohibit the shutter plate 33 from rotating due to external wind, and it is possible to suppress unnecessary intrusion of external wind.

When the blower fan 17 is driven to rotate, the discharge side of the air supply connection cylinder 22 has a negative pressure, and the negative pressure causes the shutter plate 33 to rotate in the direction of arrow C in FIG. The ventilation path 39 is opened, and outdoor air is supplied to the bathroom 11.
It will be supplied inside. Thereby, air can be supplied to the interior of the bathroom 11.

That is, when the wind is blowing outdoors, the inflow of outside air can be suppressed by closing the ventilation passage 39, and when the blowing fan 17 is driven to rotate, the ventilation passage 39 is closed. By opening the
Since the bathroom 11 can be supplied with air, convenience can be improved.

In particular, in the first embodiment, although the opening area on the suction side of the air supply connection cylinder 22 is smaller than the area of the side surface 33a of the shutter plate 33, the air shielding plate 36 , The configuration can be simplified.

The support rod 3 for supporting the shutter plate 33
The center line of the shutter plate 33 is supported by the center line of the shutter plate 33 because the center line of the shutter plate 33 is parallel to the plane including the center line of the air supply connection cylinder 22 and located above the plane in FIG. Rod 34
, The shutter plate 33 can be stopped in the vertical direction without providing a weight or the like.
The configuration can be simplified.

Further, since the shutter plate 33 is configured to be opened by the external wind caused by the negative pressure, that is, by natural air supply, the shutter plate 33 is separately opened in order to open the shutter plate 33.
There is no need to provide a blower fan, and the configuration can be simplified accordingly. Further, normally, since the shutter plate 33 is in the closed state, the hot air in the bathroom 11 does not flow to the outside through the air supply port, and the bathroom 11 has good heat insulation.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different portions will be described. In the second embodiment, instead of the wind shield plate 36 described in the first embodiment, a wind shield plate 36 'which is inclined inward of the air supply connection cylinder 22 with respect to the vertical line L is provided upright. Have been.

According to the second embodiment, the same functions and effects as those of the first embodiment can be obtained. In particular, in the second embodiment, since the wind shield plate 36 'is erected inwardly of the air supply connection cylinder 22, the outside wind hitting the wind shield plate 36' is guided upward, The force acting on the stopper member 37 at the upper portion of the shutter plate 33 by the guided outside wind increases. As a result, the shutter plate 33 is
Rotation in the direction of arrow C can be suppressed more reliably, and rotation in the direction of arrow C in FIG. 1 can also be suppressed.

Next, a third embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different portions will be described. In the third embodiment, a shutter plate 41 is employed instead of the shutter plate 33 described in the first embodiment. On the shutter plate 41, above the support rod, a spherical concave portion 4 concaved from the suction side to the discharge side.
2 are formed. Further, the wind shield 36 described in the first embodiment has been removed.

Here, consider the case where the wind is blowing outdoors. Now, when the outside air flows into the air supply duct 23 when the shutter plate 41 is stationary in the vertical direction in the axial direction, the outside air hits the shutter plate 41. In this case, as described above, the recess 42 is formed above the support bar in the shutter plate 41, whereby the force exerted by the external wind on the shutter plate 41 is Since the shutter plate 41 becomes substantially equal above and below the rod, the shutter plate 41 is moved by an arrow F in FIG.
The air passage 39 of the air supply connection cylinder 22 is not opened. In this case, the first
As in the embodiment, since the upper portion of the shutter plate 41 is in contact with the stopper member 37, the shutter plate 41
It is also forbidden to rotate in the direction of the arrow F in the middle.

As described above, according to the third embodiment, the shutter plate 41 is provided rotatably inside the air supply connection cylinder 22,
Since the shutter plate 41 is provided with the concave portion 42, when external air flows toward the suction side of the supply cylinder 22 for air supply,
The force that the external wind exerts on the shutter plate 41 is the shutter plate 4
1 and is substantially equal above and below the support bar. Thus, the same operation and effect as those of the first embodiment can be obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different portions will be described. In the fourth embodiment, a double cylinder 52 having a U-shaped cross section is provided on the outer peripheral portion of the suction side end of the air supply connection cylinder 22. A coil spring 55 is provided between the outer tube 53 and the inner tube 54 of the body 52.

The moving member 56 has an annular pressure receiving portion 57 perpendicular to the center line of the air supply connection cylinder 21, and the outer cylinder 58 provided integrally with the pressure receiving portion 57 is provided with the above-mentioned double cylinder. Body 5
The second outer cylindrical portion 53 is fitted so as to be movable in the axial direction. In this case, one end 55a of the coil spring 55
The other end 5 is in contact with the inner bottom 52a of the double cylinder 52.
5 b is in contact with the pressure receiving portion 57, so that the moving member 56 can move in the axial direction of the air supply connection cylinder 22 by the spring force of the coil spring 55.

A plurality of claws 59 are formed at a predetermined portion of the moving member 56 at the end of the outer cylinder 58, and the claws 59 are formed on the outer cylinder 53 of the double cylinder 52. A hole 60 corresponding to the portion 59 is formed. The hook 59 of the moving member 56 is urged rightward in FIG. 6 by being locked in the hole 60 of the double cylinder.

Further, an inner cylinder 61 is provided integrally with the moving member 56 on the inner peripheral side of the outer cylinder 58. When the moving member 56 moves to the discharge side of the air supply connection cylinder 22, the inner cylindrical portion 61 has a distal end 61a on the discharge side located near the shutter plate 33 (see FIG. 4). In FIG. 6, it is shown by a two-dot chain line).

With such a configuration, the shutter plate 33
When the claw portion 59 of the moving member 56 is locked in the hole portion 60 of the double cylinder (at the allowable position in the present invention),
9, rotation in the direction of arrow G is permitted, and
Moves to the discharge side of the air supply connection cylinder 22, and when the distal end portion 61a of the inner cylinder portion 61 is located near the shutter plate 33 (in the restraining position in the present invention), the rotation thereof is performed. The corners are getting smaller. Note that a vent 62 is provided on the inner peripheral side of the inner cylindrical portion 61 in the moving member 56.

When the wind is blowing outdoors, the outside wind hits the pressure receiving portion 57 of the moving member 56, and when the pressure receiving portion 57 receives a predetermined pressure or more by the outside wind, the moving member 56 Moves toward the discharge side of the supply cylinder 22 against the spring force of the coil spring 55.
Then, in accordance with the movement of the moving member 56, the distal end portion 61a of the inner cylindrical portion 61 comes to be located near the shutter plate 33, and the rotation angle of the shutter plate 33 is reduced. That is, the amount of wind flowing into the bathroom 11 from outside is reduced.

As described above, according to the fourth embodiment, the shutter plate 33 is rotatably provided inside the air supply connection cylinder 22, and the movable member 56 which is moved by the external wind is provided. The rotation of the plate 33 is allowed, and when the outside wind blows and receives a pressure higher than a predetermined value, the moving member 56
Moves to reduce the rotation of the shutter 33, so that the amount of wind flowing from the outside into the bathroom 11 can be reduced, thereby obtaining the same operation and effect as in the first embodiment described above. be able to.

The moving member 56 is connected to the supply cylinder 22.
When the shutter member 33 is moved to the discharge side, the rotation angle of the shutter plate 33 is reduced instead of prohibiting the rotation of the shutter plate 33. When moving to the discharge side of the air supply connection cylinder 22,
The air supply can be performed by rotating the blower fan 17.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The same parts as in the fourth embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different parts will be described. In the fifth embodiment, the distal end portion 61 of the inner cylindrical portion 61 is provided in the moving member 56 described in the fourth embodiment.
A filter 71 is attached to a so as to cover the vent 62.

According to the fifth embodiment, the same functions and effects as those of the fourth embodiment can be obtained. In particular, in the fifth embodiment, since the filter 71 is provided in the moving member 56 and in the vent 62 of the inner cylindrical portion 61, the bathroom 1
Insects can be prevented from invading the inside of the device. In addition, by providing the filter 71, the moving member 56
When the air blower fan 17 is driven, it is possible to prevent the moving member 56 from moving to the discharge side because the resistance increases when the air moves from the suction side to the discharge side.

The present invention is not limited to the above embodiment, but can be modified or expanded as follows. The ventilation fan may be provided on the side wall of the bathroom, and may be applied not only to the bathroom but also to other rooms. The shutter plate may be held at a position where the ventilation path is closed by a weight, a spring, or the like. An air supply fan may be provided at an intermediate position of the air supply duct.

[0060]

As is clear from the above description, according to the air supply opening of the first aspect, the opening area of the cylinder on the suction side is made smaller than the area of one surface of the shutter plate. When the outside wind flows toward the suction side of the cylinder, the force exerted by the outside wind on the shutter plate is reduced, whereby the shutter plate can be prevented from rotating due to the outside wind, and unnecessary The invasion of outside wind can be suppressed.

According to the second aspect of the present invention, since the opening area on the suction side of the cylindrical body is made smaller than the area of one surface of the shutter plate, the air shielding plate is employed, so that the structure is simplified. can do.

According to the third aspect of the present invention, the center line of the pivot is provided in a position parallel to the plane including the center line of the cylindrical body and at a position deviated from the plane, and the wind shield plate is provided. Since the shutter plate is provided on the side opposite to the surface, the center of gravity of the shutter plate is on the wind shield plate side, so that the shutter plate can be stopped in the vertical direction without providing a weight, for example, and the configuration is simplified accordingly. Can be

According to the air supply opening of the fourth aspect, the wind shield plate is provided to be inclined inward of the cylindrical body so as to guide the outside wind to the pivot side of the shutter plate. The external wind hitting the wind plate is guided to the pivot side.

According to the air supply port of the fifth aspect, the shutter plate is located on the side opposite to the pivot with respect to the plane including the center line of the cylinder, and from the suction side to the discharge side of the cylinder. When the outside air flows toward the suction side of the cylindrical body, the force exerted on the shutter plate by the outside air is exerted on the shutter plate by one side of the pivot shaft and the other side. And the same effect can be obtained as in the first aspect.

According to the air supply opening according to the sixth aspect, the pressure receiving portion is always located on the suction side of the cylindrical body at an allowable position allowing the rotation of the shutter plate, and the pressure receiving portion receives an external wind of a predetermined amount or more. In this case, since the moving member is provided at the restraining position for suppressing the rotation of the shutter plate by moving to the discharge side, the external wind flows toward the suction side of the cylindrical body, and accordingly, the pressure receiving portion is moved to the predetermined position. When the above-mentioned outside wind is received, the moving member moves to the restraining position, and the rotation of the shutter plate is restrained, whereby the same operation and effect as those of the first aspect are obtained. be able to.

According to the air supply port of the present invention, since the moving member is formed in a cylindrical shape and the filter is provided in the ventilation port, insects can be prevented from entering from the suction side to the discharge side. Further, since the resistance when the moving member moves from the suction side to the discharge side increases, it is possible to prevent the moving member from moving to the discharge side when the discharge side has a negative pressure.

According to the duct ventilation fan of the eighth aspect,
The inflow of outside wind can be suppressed by the air supply opening. In addition, when the blower fan is driven to rotate, the discharge side of the cylinder at the air supply port becomes negative pressure, and the negative pressure causes the shutter plate to open and rotate, so that air flows through the ventilation path of the cylinder. Flow and air can be supplied to the interior of the room. In this way, when wind is blowing outdoors, by closing the ventilation path, unnecessary invasion of outside air can be suppressed, and when the blower fan is driven, the ventilation path must be opened. Thereby, air can be supplied to the inside of the room, so that usability can be improved.

According to the duct ventilation fan of the ninth aspect,
Since the shutter plate is configured to be opened and rotated by natural air supply, it is not necessary to separately provide a blower fan to open and rotate the shutter plate, and the configuration can be simplified accordingly, and The air in the room does not flow freely to the outside through the air supply port.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of an air supply port body showing a first embodiment of the present invention.

FIG. 2 is a front view of an air supply opening body.

FIG. 3 is a longitudinal sectional side view showing the entire configuration.

FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention;

FIG. 7 is an exploded perspective view.

FIG. 8 is a view corresponding to FIG. 1, showing a fifth embodiment of the present invention.

FIG. 9 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

In the drawing, 11 is a bathroom (room), 12 is a ceiling, 13 is a main body, 17 is a blower fan, 22 is a connection cylinder (cylinder) for air supply, 33 is a shutter plate, 34 is a support rod (pivot), 36
Is a wind shield plate, 36 'is a wind shield plate, 39 is a ventilation path, 41 is a shutter plate, 42 is a concave portion, 56 is a moving member, 57 is a pressure receiving portion,
62 is a vent, and 71 is a filter.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuhiro Ishikawa 2-33-10 Menishi, Nishi-ku, Nagoya Toshiba Abu-E

Claims (9)

[Claims] A cylindrical member forming an air passage; and a shutter plate provided rotatably inside the cylindrical member via a pivot, and opening and closing the air passage by the rotation. The air supply opening is characterized in that the opening area on the suction side is smaller than the area of one surface of the shutter plate. 2. The airtight plate according to claim 1, wherein the cylindrical body is provided with a wind shield plate such that an opening area on the suction side of the cylindrical body is smaller than an area of one surface of the shutter plate. Air supply body. 3. The pivot is provided such that a center line thereof is parallel to a plane including a center line of the cylindrical body and is located at a position shifted from the plane. The air supply opening according to claim 2, wherein the air supply opening is provided on a side opposite to the pivot. 4. The air supply according to claim 3, wherein the wind shield plate is provided to be inclined inward of the cylindrical body so as to guide the outside wind to the pivot side of the shutter plate. Mouth body. 5. A cylindrical body forming an air passage, and a shutter plate provided rotatably inside the cylindrical body via a pivot, and opening and closing the air passage by the rotation. , The center line of which is parallel to a plane including the center line of the cylindrical body, and is provided so as to be at a position shifted from the plane, and the shutter plate is located on the opposite side of the plane from the pivot axis. And an air supply opening body provided with a concave portion which is depressed from the suction side to the discharge side of the cylindrical body. 6. A cylinder constituting an air passage, a shutter plate rotatably provided inside the cylinder via a pivot, and opening and closing the air passage by the rotation, and suction of the cylinder. A pressure receiving portion that is provided movably in the axial direction of the cylindrical body and receives external air, and is always located at an allowable position that allows the shutter plate to rotate, and the pressure receiving portion is at least a predetermined amount. A moving member located at a suppression position for suppressing rotation of the shutter plate by moving to the discharge side when receiving external wind. 7. The moving member has a cylindrical shape, and a filter is provided in a vent of the moving member.
Air supply body described. 8. A main body provided with an air supply port, a blower fan disposed inside the main body and exhausting air inside the room to the outside, and the air supply port is provided in any one of claims 1 to 7. A ventilation fan for a duct, comprising: an air supply body according to any one of claims 1 to 3, wherein the air supply body is in communication with the inside of the room. 9. The ventilation fan for a duct according to claim 8, wherein the shutter plate of the air supply opening is opened and rotated by natural air supply.