JP7170581B2 - duct blower - Google Patents

Description

The present invention relates to a duct blower that blows air through a duct.

A duct blower that blows air using a duct installed in the ceiling space or in the wall has a scroll casing installed inside a box-shaped main body. The duct blower has a wire connection device provided with a terminal block for electrical connection with an external power source in a space inside the main body and outside the scroll casing.

Patent Literature 1 discloses a duct blower that includes a cylindrical protective frame that surrounds a wire connection device and a terminal cover that seals the ends of the protective frame in a watertight manner. The duct blower disclosed in Patent Document 1 separates the suction space into which indoor air is sucked from the space inside the protective frame in a watertight state, thereby preventing the indoor air from entering the inside of the wire connection device. prevents condensation from forming.

Japanese Patent No. 4566665

However, the duct blower disclosed in Patent Document 1 does not take measures to prevent the user from forgetting to close the terminal cover. Therefore, when the duct blower disclosed in Patent Document 1 is operated with the terminal cover open, indoor air enters the inside of the protective frame and condensation occurs inside the wire connection device. I had a problem with it.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a duct blower that can be prevented from being operated with the terminal cover open.

In order to solve the above-described problems and achieve the object, the present invention includes a main body having an intake port and an exhaust port formed thereon, a flange provided on the surface on which the intake port is formed, and an intake port and a discharge port. Equipped with a connecting air passage portion and a protective frame provided outside the air passage portion, and installed in the main body so that the intake port and the suction port communicate with each other, and the exhaust port and the discharge port communicate with each other. The protective frame forms a cylindrical portion inside the main body and outside the air passage portion with one open end facing the side of the main body on which the intake port is formed, a fan casing, a motor, and a shaft of the motor. A blower that forms an airflow that flows into the fan casing from the suction port and flows out from the discharge port, and a wire connection device that is installed inside the protective frame and connects the motor and the external power supply. a terminal cover attached to the fan casing so as to be rotatable about an axis parallel to the surface of the main body on which the intake port is formed, and opening and closing one end of the tubular portion; and a flange attached to the fan casing. and a decorative grill abutting and covering the air intake. When the decorative grille is attached to the fan casing when the terminal cover is rotated less than 90 degrees from the closed state, the decorative grille includes a first projection that contacts the terminal cover and closes the terminal cover; a second protrusion that contacts the terminal cover when attached to the fan casing when the rotation angle of the terminal cover from the closed state is 90 degrees or more and creates a gap between the decorative grille and the flange. .

ADVANTAGE OF THE INVENTION According to this invention, it is effective in being able to obtain the duct blower which can suppress driving|operating in the state with the terminal cover opened.

A sectional view showing the configuration of the ventilation fan according to Embodiment 1 of the present invention. Front view of the ventilation fan according to Embodiment 1 with the decorative grille removed Fig. 2 is a front view of the ventilating fan according to Embodiment 1 with the decorative grille and the terminal cover removed; A perspective view of a terminal cover of the ventilation fan according to Embodiment 1 Fig. 3 is a perspective view of the ventilation fan according to Embodiment 1 with the terminal cover removed; FIG. 4 is a cross-sectional view showing a state in which a decorative grille is attached when the terminal cover of the ventilation fan according to Embodiment 1 is rotated at an angle of less than 90 degrees from the closed state; FIG. 4 is a cross-sectional view showing a state in which a decorative grille is attached when the terminal cover of the ventilation fan according to Embodiment 1 is rotated at an angle of 90 degrees or more from the closed state; FIG. 4 is a side view showing a state in which a decorative grille is attached when the terminal cover of the ventilation fan according to Embodiment 1 is rotated at an angle of 90 degrees or more from the closed state;

A duct blower device according to an embodiment of the present invention will be described in detail below with reference to the drawings. In addition, this invention is not limited by this embodiment.

Embodiment 1.
FIG. 1 is a cross-sectional view showing the configuration of a ventilation fan according to Embodiment 1 of the present invention. FIG. 2 is a front view of the ventilation fan according to Embodiment 1 with the decorative grille removed. FIG. 3 is a front view of the ventilation fan according to Embodiment 1 with the decorative grille and the terminal cover removed. Ventilation fan 100, which is a duct blower according to Embodiment 1, is operated after inserting duct connection port 8 into duct 14 that communicates between the interior and exterior of the room, thereby ventilating the air in the room. The ventilation fan 100 has a main body 2 , a duct connection port 8 and a blower 1 . The main body 2 is box-shaped with one side open and provided with an intake port 2b. One of the side surfaces of the main body 2 is formed with an exhaust port 2c. The duct connection port 8 extends vertically from the side surface of the main body 2 where the exhaust port 2c is formed, and extends to a position where the exhaust port 2c communicates with the duct 14. As shown in FIG. The blower 1 is a ventilation driver that circulates air to be ventilated. A fan casing 6 that forms an air passage for the blower 1 is accommodated in the main body 2 .

The fan casing 6 is formed with a suction port 5 through which air is drawn in and a discharge port 6a through which air is discharged. The fan casing 6 includes an air passage portion 6b connecting the suction port 5 and the discharge port 6a, and a protective frame 30 provided outside the air passage portion 6b. The fan casing 6 is installed in the main body 2 so that the intake port 2b and the suction port 5 are in communication, and the exhaust port 2c and the discharge port 6a are in communication. By installing the fan casing 6 inside the main body 2, the protective frame 30 has one end portion 30b facing the side of the main body 2 on which the air intake port 2b is formed inside the main body 2 and outside the air passage portion 6b. An open cylindrical portion 30c is formed. The protective frame 30 may be cylindrical and the protective frame 30 itself may form the cylindrical portion 30c. A shaped portion 30c may be formed. The protective frame 30 is formed with a protective wall 18 that extends from one end 30b of the tubular portion 30c in the axial direction of the tubular portion 30c and surrounds the circumference of the one end 30b of the tubular portion 30c. A concave portion is formed by the one end portion 30b and the protective wall 18 . The other end 30a of the tubular portion 30c is closed by coming into contact with the motor mounting surface 28 of the main body 2. As shown in FIG. The other end 30a of the tubular portion 30c may be closed by the protective frame 30 itself. That is, the cylindrical portion 30c may have a shape in which only one end portion 30b is open. The discharge port 6 a overlaps the exhaust port 2 c of the main body 2 . That is, the airflow discharged from the fan casing 6 is discharged to the outside of the main body 2 without moving outside the fan casing 6 and inside the main body 2 .

The main body 2 is arranged behind the ceiling through a main body embedding hole 26 formed in the ceiling 25, and installed by inserting the duct connection port 8 from the indoor side into the duct 14 leading to the outdoors. The main body 2 installed above the ceiling is fixed to the ceiling 25 by driving wood screws into the ceiling 25 through through holes 27 provided in the flange 2a.

Although the case where the ventilating fan 100 is installed above the ceiling will be described here, the ventilating fan 100 may be installed inside the wall. Therefore, the following description does not limit the mounting posture of the ventilation fan 100 .

The ventilating fan 100 includes a decorative grille 12 which is a design part to prevent internal parts such as the fan casing 6 from being seen from inside the room and making the appearance worse. The decorative grille 12 is fixed in contact with the flange 2a by hooking the spring 13 on a spring fixing portion 7 attached to the fan casing 6. The decorative grille 12 has a spring 13 for attachment.

The blower 1 comprises a motor 3 and a fan 4 which is inserted into a shaft 3a of the motor 3. As shown in FIG. The fan 4 forms an airflow that flows into the fan casing 6 from the suction port 5 and flows out from the discharge port 6a. A motor 3 drives a fan 4 . The motor 3 is fixed to a motor mounting surface 28, which is a surface of the main body 2 opposite to the surface on which the intake port 2b is formed.

The wire connection device 20 and the motor 3 are electrically connected by a motor wire (not shown). The wire connecting device 20 is surrounded by the cylindrical portion 30c. One end portion 30b of the cylindrical portion 30c faces the intake port 2b side. One end portion 30b of the cylindrical portion 30c is closed by the terminal cover 11 to prevent dust and moisture from entering. Electric power supplied through the external power supply wire flows to the motor 3 via the wire connection device 20 and the motor wire, thereby converting electrical energy into rotational motion of the shaft 3a. When the motor 3 transmits rotational motion to the fan 4 , the fan 4 rotates and an air flow is formed in the air passage portion 6 b of the fan casing 6 . An external power wire hole 30e is formed in the other end portion 30a of the tubular portion 30c, and an elastic cable bush 30d is installed in the external power wire hole 30e. An external power supply wire connected to the wire connection device 20 is pulled into the cylindrical portion 30c through the cable bush 30d. Since the elastic cable bushing 30d is in close contact with the external power supply wire, dust and moisture are prevented from entering through the gap between the cable bushing 30d and the external power supply wire.

The duct connection port 8 has a tapered shape in which the outer diameter gradually decreases toward the end opposite to the main body 2 . Since the outer diameter of the duct connection port 8 is gradually reduced, a duct 14 having a different diameter can be connected to the duct connection port 8, and the gap between the duct connection port 8 and the duct 14 can be closed by winding a tape. The workability of the taping work for closing the is improved. A shutter 9 that opens and closes by wind pressure is provided in the duct connection port 8 . The shutter 9 is opened by wind pressure when the ventilation fan 100 is in operation, and closed by its own weight to close the duct connection port 8 when the fan 100 is stopped. By providing the shutter 9 in the duct connection port 8, it is possible to prevent outside air from entering the room when the ventilation fan 100 is stopped.

The duct 14 extends to the outside and is connected to a hood (not shown) installed on the exterior wall of the building, forming a ventilation passage for ventilating the air inside the house.

The suction port 5 is formed on one end surface of the fan casing 6 . Air sucked into the fan casing 6 from the suction port 5 is sent along the inner wall of the fan casing 6 to the exhaust port 2c by the blower 1, and is exhausted to the outside through the duct connection port 8 and the duct 14. The fan casing 6 is fixed to the motor mounting surface 28 of the main body 2 with screws. A spring fixing portion 7 for attaching a decorative grille 12 is formed at the end of the fan casing 6 on the side where the suction port 5 is formed.

4 is a perspective view of a terminal cover of the ventilation fan according to Embodiment 1. FIG. FIG. 5 is a perspective view of the ventilation fan according to Embodiment 1 with the terminal cover removed. The terminal cover 11 has a shaft 16 . The terminal cover 11 is attached to the fan casing 6 by inserting a shaft 16 into a hole 15 provided in the fan casing 6 . A shaft 16 inserted into the hole 15 is supported in parallel with the open surface of the main body 2 where the intake port 2b is provided. The terminal cover 11 can be opened and closed by rotational movement about the shaft 16 when the shaft 16 is inserted into the hole 15 . The terminal cover 11 and the fan casing 6 may be connected by a living hinge instead of the combination of the shaft 16 and the hole 15 .

By opening the terminal cover 11, it becomes possible to access the inside of the cylindrical portion 30c in which the wire connecting device 20 is accommodated, and it becomes possible to easily insert an external power supply wire from the inside of the room. The terminal cover 11 is provided with a finger hook portion 17 for facilitating the opening of the terminal cover 11 . The finger hook portion 17 has a curved plate shape along the pad of the finger. When the terminal cover 11 is closed, the terminal cover 11 is fitted in the recess formed by the one end 30b of the tubular portion 30c and the protective wall 18, so that the degree of sealing can be improved. Further, by providing the protective wall 18 with a locking projection 19 as a locking portion, the terminal cover 11 can be locked and the closed state can be maintained.

A spring 13 for attaching the decorative grill 12 to the main body 2 is attached to the decorative grill 12 by a spring fixing part 21 . The decorative grille 12 is attached to the main body 2 by hooking a spring 13 on a spring fixing portion 7 provided in the fan casing 6, and covers the front surface of the ventilation fan 100. - 特許庁

FIG. 6 is a cross-sectional view showing a state in which the decorative grille is attached when the terminal cover of the ventilation fan according to Embodiment 1 is rotated less than 90 degrees from the closed state. In addition, in FIG. 6, the external power supply electric wire connected to the electric wire connection apparatus 20 is shown with the broken line. The decorative grille 12 has a push-in protrusion 22 that contacts the terminal cover 11 when the terminal cover 11 is rotated at an angle of less than 90 degrees from the closed state, and a terminal cover from the closed state. A contact projection 23 is provided that contacts the terminal cover 11 when the rotation angle of the terminal cover 11 is 90 degrees or more. When the terminal cover 11 is rotated by 90 degrees or more from the closed state, the surface of the terminal cover 11 to face and cover the one end 30b of the tubular portion 30c is the surface of the tubular portion 30c. It does not face the one end 30b side.

When the decorative grille 12 is attached to the fan casing 6 when the rotation angle of the terminal cover 11 from the closed state of the terminal cover 11 is less than 90 degrees, the push-in projection 22 contacts the terminal cover 11 to close the terminal cover 11. - 特許庁This is the first protrusion. When the angle of rotation of the terminal cover 11 from the closed state is less than 90 degrees, when the decorative grille 12 hooked on the spring fixing portion 7 is pushed up toward the main body 2, the push-in projection 22 pushes the terminal cover 11. is pressed, it is possible to close the terminal cover 11 . As described above, at the other end portion 30a of the tubular portion 30c, the external power supply wire is pulled into the tubular portion 30c through the elastic cable bush 30d. The inside of the shaped portion 30c can be isolated from the air passage portion 6b.

FIG. 7 is a cross-sectional view showing a state in which the decorative grille is attached when the terminal cover of the ventilation fan according to Embodiment 1 is rotated at an angle of 90 degrees or more from the closed state. FIG. 8 is a side view showing a state in which the decorative grille is attached when the terminal cover of the ventilation fan according to Embodiment 1 is rotated at an angle of 90 degrees or more from the closed state. When the decorative grill 12 is attached to the fan casing 6 when the terminal cover 11 is rotated at an angle of 90 degrees or more from the closed state, the contact protrusion 23 contacts the terminal cover 11 and contacts the decorative grill 12. This is the second protrusion that creates a gap with respect to the flange 2a. The height of the contact protrusion 23 is a dimension that creates a gap between the decorative grille 12 and the flange 2a when the contact protrusion 23 is in contact with the terminal cover 11 . When the user forgets to close the terminal cover 11 and a gap is generated between the decorative grille 12 and the flange 2a, the decorative grille 12 cannot be completely attached, so that the user can visually recognize an abnormality inside the main body 2.例文帳に追加becomes possible. Therefore, it is possible to prevent the terminal cover 11 from being left unclosed, and it is possible to prevent dust and moisture from entering the wire connecting device 20, thereby enhancing safety.

In ventilating fan 100 according to Embodiment 1, push-in projections 22 are provided on decorative grille 12. Therefore, if the angle of rotation of terminal cover 11 from the closed state of terminal cover 11 is less than 90 degrees, decorative grille 12 is attached to the fan casing 6, the terminal cover 11 can be closed. Further, in ventilating fan 100 according to Embodiment 1, since contact projections 23 are provided on decorative grille 12, if terminal cover 11 is rotated at an angle of 90 degrees or more from the closed state, decorative By attaching the grille 12 to the fan casing 6, a gap is created between the flange 2a and the decorative grille 12, and it is possible to visually notify the user that the terminal cover 11 has been left unclosed.

In the above description, the ventilation fan 100 for ventilating the room is configured by connecting the duct connection port 8 to the duct 14 leading to the outdoors, but it is also possible to connect the duct connection port 8 to the duct leading to the room. can. When connecting the duct connection port 8 to a duct leading to the room, a filter or an electric dust remover may be installed in the duct to form an air cleaning device, or a humidifier may be installed in the duct to form a humidifying device. can do. It should be noted that a device different from the one illustrated here can be installed in a duct leading to the room and combined with the duct blower.

The configuration shown in the above embodiment shows an example of the content of the present invention, and it is possible to combine it with another known technology, and one configuration can be used without departing from the scope of the present invention. It is also possible to omit or change the part.

Reference Signs List 1 blower 2 main body 2a flange 2b intake port 2c exhaust port 3 motor 3a shaft 4 fan 5 suction port 6 fan casing 6a discharge port 6b air passage portion 7 spring fixing portion 8 duct connection port 9 shutter 11 terminal cover 12 decorative grill 13 spring 14 duct 15 hole 16 shaft 17 finger hook portion 18 protective wall 19 locking projection 20 wire connecting device 21 spring fixing part 22 push-in projection, 23 contact projection, 25 ceiling, 26 main body embedding hole, 27 through hole, 28 motor mounting surface, 30 protective frame, 30a other end, 30b one end, 30c tubular portion, 30d cable bush, 30e external Hole for power wire, 100 ventilation fan.

Claims (3)

a main body having an intake port and an exhaust port formed thereon, and a flange provided on a surface on which the intake port is formed;
An air passage connecting a suction port and a discharge port, and a protective frame provided outside the air passage, wherein the suction port communicates with the suction port, and the discharge port and the discharge port communicate with each other. one end of the protective frame facing the surface of the main body on which the intake port is formed, inside the main body and outside the air passage section. a fan casing forming an open tubular portion;
a blower comprising a motor and a fan attached to the shaft of the motor, and forming an airflow that flows into the fan casing from the suction port and flows out from the discharge port;
a wire connecting device installed inside the protective frame for connecting the motor and an external power source;
a terminal cover attached to the fan casing so as to be rotatable about an axis parallel to the surface of the main body on which the intake port is formed, and opening and closing one end of the cylindrical portion;
a decorative grill attached to the fan casing and in contact with the flange to cover the intake port;
When the decorative grille is attached to the fan casing when the terminal cover is rotated by an angle of less than 90 degrees from the closed state, the decorative grille contacts the terminal cover to close the terminal cover. and when the terminal cover is attached to the fan casing when the terminal cover is rotated at an angle of 90 degrees or more from the closed state, it contacts the terminal cover and rotates in a direction opposite to the direction in which the terminal cover is closed. A duct blower, comprising: a second protrusion that biases and creates a gap between the decorative grille and the flange. The protective frame has a protective wall that extends from one end of the cylindrical portion in the axial direction of the cylindrical portion and surrounds the one end of the cylindrical portion,
2. The duct blower according to claim 1, wherein the terminal cover is fitted in a recess formed by one end of the tubular portion and the protective wall when the terminal cover is closed. 3. The duct blower according to claim 2, wherein the recess has an engaging portion for engaging the terminal cover in a closed state.

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