JP6735906B2 - Ventilation fan for duct - Google Patents

Description

The present invention relates to a duct ventilation fan including a shutter that prevents outside air from entering when ventilation is stopped.

The duct ventilation fan disclosed in Patent Document 1 is a bent pipe immediately after the exhaust duct is connected to the duct connecting member when the shutter that prevents the outside air from entering penetrates the duct connecting member during the opening operation. Then, the problems that the shutter cannot be fully opened, the shutter hits the exhaust duct, and is damaged or deformed are improved.

JP-A-11-281120

The duct ventilation fan provided with the shutter has a problem that, if a load is applied to the shutter due to disturbance, the shutter may come off the duct connecting member against the user's intention. The disturbance factors until the product is installed can be exemplified by the vibration applied during transportation, the impact applied when the product is dropped, and the worker's hand hitting the shutter during installation. The disturbance factor after the product is installed can be exemplified by a strong external wind blowing into the duct. The invention disclosed in Patent Document 1 takes into consideration a problem when the shutter itself operates, but considers preventing the shutter from coming off the duct connecting member when a load due to disturbance is applied to the shutter. It has not been.

The present invention has been made in view of the above, and an object of the present invention is to provide a duct ventilation fan in which the shutter is prevented from coming off the duct connecting member when a load is applied to the shutter.

In order to solve the above-mentioned problems and achieve the object, the present invention forms a ventilation fan main body having an air intake port and an air exhaust port, and an air flow flowing from the intake port into the ventilation fan main body and flowing out from the exhaust port. And a duct connecting member that is detachably attached to the main body of the ventilation fan and that connects the exhaust port and the duct to each other. A duct ventilation fan that discharges air sucked in from a duct to a duct through a duct connecting member, and includes a shutter that prevents outside air from entering when the blower is stopped. The shutter is axially supported inside the duct connecting member by a shaft portion formed on the duct connecting member and a bearing portion formed on the shutter. The shaft portion has a columnar shape in which a notch along the axial direction is provided on the side surface on the outdoor side. A protrusion having a convex curved surface is provided at the tip of the shaft portion, and the bottom surface of the protrusion protrudes to the outside of the room from the portion provided with the notch.

INDUSTRIAL APPLICABILITY The duct ventilation fan according to the present invention has an effect of reducing detachment of the shutter from the duct connecting member when a load is applied to the shutter.

Sectional drawing which shows the attachment state of the ventilation fan for ducts which concerns on embodiment of this invention. The bottom view in the state which removed the makeup grill of the ventilation fan for ducts which concerns on embodiment. The bottom view in the state which removed the decorative grill of the ventilation fan for ducts which concerns on embodiment, and opened the terminal cover. The figure which shows the state which looked at the duct connection member of the ventilation fan for ducts which concerns on embodiment from the outdoor side. Sectional drawing of the duct connection member of the ventilation fan for ducts which concerns on embodiment. Sectional drawing of the duct connection member of the ventilation fan for ducts which concerns on embodiment. Sectional drawing of the duct connection member of the ventilation fan for ducts which concerns on embodiment. The side view of the shaft part of the ventilation fan for ducts which concerns on embodiment. The front view of the shaft part of the ventilation fan for ducts which concerns on embodiment. The side view of the bearing part of the ventilation fan for ducts which concerns on embodiment. The front view of the bearing part of the ventilation fan for ducts which concerns on embodiment. Enlarged view of the shaft portion and the bearing portion of the duct ventilation fan according to the embodiment The figure which shows the modification of the axial part of the ventilation fan for ducts which concerns on embodiment.

Hereinafter, a duct ventilation fan according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a cross-sectional view showing a mounted state of a duct ventilation fan according to an embodiment of the present invention. FIG. 2 is a bottom view of the duct ventilation fan according to the embodiment with the decorative grill removed. FIG. 3 is a bottom view of the duct ventilation fan according to the embodiment with the decorative grill removed and the terminal cover open. The ventilation fan 100 is installed in the opening provided in the ceiling, and the duct connecting member 8 is inserted from the indoor side into the duct 14 that communicates indoors and outdoors to ventilate the indoor air. The ventilation fan 100 has a multi-blade blower 1 which is a blower for circulating the air to be ventilated, and a fan casing 5 which houses the multi-blade blower 1. The multi-blade blower 1 includes a motor 3 and a fan 4 attached to the shaft of the motor 3. The ventilation fan 100 includes a ventilation fan main body 2 and a duct connecting member 8 provided on a side portion of the ventilation fan main body 2 and extending in a direction perpendicular to a side surface of the ventilation fan main body 2 to extend a discharge port 10 to a position communicating with the duct 14.

The ventilation fan 100 includes a decorative grill 12 that is a design component that prevents the internal components of the ventilation fan main body 2 including the fan casing 5 from being seen from the room. The makeup grill 12 includes a spring 13 for mounting the main body, and is fixed to the ventilation fan main body 2 by hooking the spring 13 on a spring fixing portion 7 provided in the fan casing 5.

The duct 14 extends to the outside and is connected to a hood installed on the outer wall of the building, and forms a ventilation air path for ventilating the air inside the building.

The ventilation fan main body 2 is a box type with an open lower surface, and a motor 3 is installed on the upper surface. The lower surface of the ventilation fan main body 2 serves as an intake port for taking in air from the room. An exhaust port 2b is formed on one side surface of the ventilation fan main body 2. The duct connecting member 8 is connected to the exhaust port 2b.

The duct connecting member 8 has a stepped outer diameter that gradually decreases toward the side to which the duct 14 is connected, and has a stepped shape. Since the outer diameter of the duct connecting member 8 is gradually reduced, the duct connecting member 8 can be connected to a plurality of ducts 14 having different inner diameters. Further, since the duct connecting member 8 has the step, it is easy to perform the work of winding the tape when sealing the joint between the duct connecting member 8 and the duct 14.

The fan casing 5 is provided with an openable/closable resin terminal cover 11. The resin terminal cover 11 covers the wire connection device 20 to which the external power supply wire can be connected.

The electric wire connection device 20 and the motor 3 are electrically connected to each other by an internal electric wire (not shown), and electricity applied by an external power supply electric wire flows from the internal electric wire to the motor 3 via a terminal block. By converting the electric energy into the rotational movement of the shaft of the motor 3 and transmitting the rotational movement to the fan 4, the fan 4 rotates to form a flow of air.

The fan casing 5 accommodates the multi-blade blower 1 and has an open lower surface to form a suction port 6. The air sucked into the fan casing 5 from the suction port 6 is sent to the exhaust port 2b along the inner wall of the fan casing 5 by the multiblade blower 1, and is exhausted to the outside through the duct connecting member 8 and the duct 14. It

Drawing 4 is a figure showing the state where the duct connecting member of the ventilation fan for ducts concerning an embodiment was seen from the outdoors. FIG. 5 is a cross-sectional view of the duct connecting member of the duct ventilation fan according to the embodiment, and shows a cross section taken along line V-V in FIG. 4. FIG. 6 is a cross-sectional view of the duct connecting member of the duct ventilation fan according to the embodiment, and shows a cross section taken along line VI-VI in FIG. 4. FIG. 7 is a cross-sectional view of the duct connecting member of the duct ventilation fan according to the embodiment, and shows a cross section taken along line VI-VI in FIG. 4 when the shutter 9 is closed. Inside the duct connecting member 8, a shutter 9 that is opened and closed by wind pressure is installed. FIG. 4 shows the duct connecting member 8 with the shutter 9 opened. The duct connection member 8 is provided with a rotation stopper 21 that keeps the opening angle of the shutter 9 at a set angle and a shutter stopper 22 that abuts the shutter 9 in the closed state. During operation of the ventilation fan 100, the shutter 9 is rotated until it comes into contact with the rotation stopper 21 by the wind pressure of the airflow generated by the multiblade blower 1 to open the opening of the duct connecting member 8. Further, when the ventilation fan 100 is stopped, the shutter 9 rotates by its own weight until it comes into contact with the shutter stopper 22, and closes the opening of the duct connecting member 8. Since the duct connection member 8 is provided with the shutter 9, it is possible to prevent outside air from entering the room when the ventilation fan 100 is stopped.

The shaft portion 23 provided on the duct connection member 8 penetrates the hole 28 of the bearing portion 26 provided on the shutter 9. Therefore, the shaft portion 23 is axially supported by the bearing portion 26, and the shutter 9 can be rotated by wind pressure. In the present embodiment, the shaft portion 23 is integrated with the duct connecting member 8, but may be a separate component. When the shaft portion 23 is formed integrally with the duct connecting member 8, the shape of the duct connecting member 8 becomes complicated and the component cost increases, but the work of assembling the shaft portion 23 and the duct connecting member 8 becomes unnecessary. .. On the other hand, when the shaft portion 23 and the duct connecting member 8 are separate parts, the work of assembling the shaft portion 23 and the duct connecting member 8 is required, but the shape of the duct connecting member 8 is simple, and thus the component cost Can be reduced.

FIG. 8 is a side view of the shaft portion of the duct ventilation fan according to the embodiment. FIG. 9 is a front view of the shaft portion of the duct ventilation fan according to the embodiment. The shaft portion 23 has a columnar shape in which a notch along the axial direction is provided on the side surface on the outdoor side. In the embodiment, the side surface of the shaft portion 23 where the cutout is provided is a flat plane portion 25. Therefore, the cross section of the shaft portion 23 perpendicular to the axis has an arc shape surrounded by the arcs forming the cylindrical side surface portion and the chords forming the plane portion 25. Further, the tip end 24 of the shaft portion 23 has a convex curved projection shape. Examples of convex curved surfaces include, but are not limited to, hemispherical surfaces, partially spherical surfaces, rotational paraboloids and elliptical paraboloids. The bottom surface portion 24a of the protrusion of the tip 24 projects from the flat surface portion 25 to the outside of the room in an eaves shape. Therefore, a step is formed at the boundary between the tip 24 and the flat surface portion 25, and the shaft portion 23 has a hook shape when viewed from a direction orthogonal to the axial direction and parallel to the flat surface portion 25.

Since the cross section of the shaft portion 23 has an arc shape surrounded by a superior arc and chords, the side surface of the shaft portion 23 has a cylindrical side surface portion over a half circumference or more. Therefore, even if the flat surface portion 25 is provided, the rotation operation of the shaft portion 23 is not hindered.

FIG. 10 is a side view of the bearing portion of the duct ventilation fan according to the embodiment. FIG. 11 is a front view of the bearing portion of the duct ventilation fan according to the embodiment. The bearing portion 26 is in the shape of a tongue rising vertically from the main surface of the shutter 9, and has a hole 28 having a size through which the tip 24 of the shaft portion 23 can penetrate.

FIG. 12 is an enlarged view of a shaft portion and a bearing portion of the duct ventilation fan according to the embodiment. When an external force is applied to the shutter 9 in the closed state from the outdoor side, the flat surface portion 25 of the shaft portion 23 comes into contact with the edge of the hole 28 of the bearing portion 26. In the state where the flat surface portion 25 is in contact with the bearing portion 26, even if a force is applied in the direction of pulling out the shaft portion 23 from the hole 28, the bottom surface portion 24 a is caught by the edge of the hole 28, so that the shaft portion 23 comes out of the hole 28 It is suppressed from coming off.

In the duct ventilation fan according to the embodiment, when the direction of the load applied to the shutter 9 due to the disturbance is from the outdoor side to the indoor side, the bottom surface portion 24a is caught on the edge of the hole 28, so that the shaft portion Since 23 is prevented from coming off from the hole 28, the shutter 9 is prevented from coming off the duct connecting member 8 against the user's intention.

When the shaft portion 23 is formed by die processing, a flat surface portion may be provided in the portion where the parting line exists. FIG. 13 is a diagram showing a modified example of the shaft portion of the duct ventilation fan according to the embodiment. Since the parting line 30 is located in the direction of ±90 degrees with respect to the plane portion 25, the plane portions 29 are provided in the directions of +90 degrees and −90 degrees with respect to the plane portion 25. By providing the flat surface portion 29, the shutter 9 can rotate without resistance due to wind pressure even if there is a disturbance such as a burr on the parting line 30 or a slight positional deviation.

Although the shaft portion 23 is provided in the duct connecting member 8 in the above-described embodiment, the shaft portion may be provided in the shutter 9 and the bearing portion may be provided in the duct connecting member 8. When the shaft portion is provided on the shutter 9, the shaft portion may be integrated with the shutter 9 or may be a separate component. When the shaft portion is formed integrally with the shutter 9, the shape of the shutter 9 becomes complicated and the component cost increases, but the work of assembling the shaft portion and the shutter 9 becomes unnecessary. On the other hand, when the shaft part and the shutter 9 are separate parts, the work of assembling the shaft part and the shutter 9 is required, but the shape of the shutter 9 is simple, and the parts cost can be reduced.

In the above embodiment, the duct ventilation fan includes the multi-blade blower 1 that is a centrifugal fan, but an axial fan may be used to configure the duct ventilation fan. Further, it can be applied to a duct ventilation fan that constitutes a ventilation system member in combination with an air conditioner.

Further, in the above-described embodiment, the flat surface portion 25 is formed on the side surface on the outdoor side of the shaft portion 23, but a notch is formed on the side surface on the outdoor side of the shaft portion 23, and the tip 24 is hooked. It just needs to be in a shape. That is, the side surface on the outdoor side of the shaft portion 23 does not have to be flat.

The configurations described in the above embodiments are examples of the content of the present invention, and can be combined with other known techniques, and the configurations of the configurations are not departing from the scope of the present invention. It is also possible to omit or change parts.

1 multi-blade blower, 2 ventilation fan main body, 2b exhaust port, 3 motor, 4 fan, 5 fan casing, 6 suction port, 7 spring fixing part, 8 duct connection member, 9 shutter, 10 discharge port, 11 resin terminal cover, 12 makeup grill, 13 spring, 14 duct, 20 electric wire connecting device, 21 rotation stop, 22 shutter stop, 23 shaft part, 24 tip, 24a bottom part, 25, 29 flat part, 26 bearing part, 28 hole, 30 parting Line , 100 ventilation fan .

Claims (8)

A ventilation fan body having an air intake port and an air exhaust port formed therein, a blower for forming an airflow flowing into the ventilation fan body from the intake port and flowing out from the exhaust port, and detachably attached to the ventilation fan body. An air duct that includes a tubular duct connecting member that communicates an exhaust port and a duct, is installed on the ceiling above the air with the air inlet being the indoor side, and sucks air sucked from the room through the air inlet to the duct connecting member. A ventilation fan for a duct that discharges to the duct via
A shutter is provided to prevent outside air from entering when the blower is stopped,
The shutter is axially supported inside the duct connecting member by a shaft portion formed in the duct connecting member, and a bearing portion formed in the shutter and having a hole through which the shaft portion can penetrate,
The shaft portion has a columnar shape provided with a notch along the axial direction on the side surface on the outdoor side,
A cross section perpendicular to the axial direction of the shaft portion has an arc shape surrounded by a superior arc and a chord in a portion where the notch is provided,
A protrusion is provided at the tip of the shaft portion,
A ventilation fan for a duct, characterized in that a step perpendicular to the cutout is formed between the protrusion and the cutout . The ventilation fan for ducts according to claim 1, wherein the shaft portion is integrated with the duct connection member. The ventilation fan for duct according to claim 1, wherein the shaft portion is a separate component from the duct connection member. A ventilation fan body having an air intake port and an air exhaust port formed therein, a blower for forming an airflow flowing into the ventilation fan body from the intake port and flowing out from the exhaust port, and detachably attached to the ventilation fan body. An air duct that includes a tubular duct connecting member that communicates an exhaust port and a duct, is installed on the ceiling above the air with the air inlet being the indoor side, and sucks air sucked from the room through the air inlet to the duct connecting member. A ventilation fan for a duct that discharges to the duct via
A shutter is provided to prevent outside air from entering when the blower is stopped,
The shutter is axially supported inside the duct connection member by a shaft portion formed on the shutter and a bearing portion formed on the duct connection member and having a hole through which the shaft portion can penetrate.
The shaft portion has a cylindrical shape in which a cutout along the axial direction is provided on a side surface on the indoor side in a state where the shutter is in a closed position,
A cross section perpendicular to the axial direction of the shaft portion has an arc shape surrounded by a superior arc and a chord in a portion where the notch is provided,
A protrusion is provided at the tip of the shaft portion,
A ventilation fan for a duct, characterized in that a step perpendicular to the cutout is formed between the protrusion and the cutout . The ventilation fan for duct according to claim 4, wherein the bearing portion is integrated with the duct connection member. The ventilation fan for duct according to claim 4, wherein the bearing portion is a separate component from the duct connection member. The duct ventilation fan according to any one of claims 1 to 6, wherein a portion of the shaft portion provided with the notch is flat. The duct ventilation fan according to any one of claims 1 to 7, wherein the protrusion provided at the tip of the shaft portion has a convex curved surface shape.