JP2012247123A - Ventilating fan unit for duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilating fan unit for a duct in which workability and maintenance ability can be enhanced by fixing the vicinity of a sucking opening of a fan casing to an outer casing by screws and the screws for fixing the fan casing to the outer casing does not interfere with a spring for fixing a decorative grill to the fan casing.SOLUTION: The ventilating fan unit has the box-like outer casing 20 in which the lower surface is opened, a blower 3 is attached to the top surface, and an exhaust opening is arranged in the side surface, a fan casing 6 in which an upper surface is opened, the sucking opening 7 is arranged in the lower surface, which is introduced into the outer casing 20, in which the blower 3 is housed, a wind channel 8 is formed between the blower 3 and the fan casing, and a discharge opening communicating with the exhaust opening of the outer casing is arranged in the side surface, and the decorative grill 30 secured to the lower surface of the fan casing 6 by the spring 35 and closing the lower surface opening of the outer casing 20, the fan casing 6 is fixed to the outer casing by a plurality of screwing parts arranged around the sucking opening 7 by the screws.

Description

  The present invention relates to a ventilation fan device for a duct that is attached to a ceiling or the like and is connected to a duct provided on the back of the ceiling or the like to ventilate indoor air.

  In a conventional ceiling-mounted ventilation fan, a main body and a fan are housed and installed in the main body to form an air passage between the main body and a makeup that is held by the fan casing and closes the lower surface opening of the main body The fan casing is screwed and fixed to the top surface of the main body, and the decorative grille is attached to the mounting bracket, and has a spring having a bifurcated leg that is V-shaped and biased in the expanding direction. , And inserted into the slit of the spring mounting portion provided in the fan casing, and the urging force of the decorative grille is closely attached to the ceiling and held to close the lower surface opening of the main body (see, for example, Patent Document 1) ).

JP-A-4-15440 (pages 248-249, FIG. 1-3)

In the conventional ceiling-mounted ventilation fan as described above, the fan casing is fixed by screwing to the top surface of the main body, so that the screw tightening work is performed in a narrow gap between the main body and the fan casing. The workability was bad.
Also, since this ceiling-mounted ventilation fan is installed on the ceiling, the fan casing is fixed to the top surface of the main body in addition to working at high places, so it is difficult to grasp the screw position due to the dark part. Maintenance was extremely troublesome.

  Therefore, it is conceivable that the fan casing is screwed and fixed to the main body in the vicinity of the suction port at a position that does not affect the air passage. In this case, the spring holding the decorative grille is a screw that fixes the fan casing to the main body. The fan casing is not pressed against the fan casing, so the urging force does not act on the fan casing, and the decorative grille cannot be pulled up until it touches the ceiling. The problem of becoming defective occurs. For this reason, the fan casing has to be fixed to the top surface of the main body with screws.

  The present invention has been made to solve the above-described problems, and the workability and maintainability are improved by fixing the vicinity of the suction opening of the fan casing to the outer casing with a screw, and the fan casing is mounted on the outer casing. It is an object of the present invention to provide a ventilation fan device for a duct in which a decorative grill is not caught on a spring attached to a fan casing by a screw to be fixed (hereinafter, the screw interferes with the spring in this state).

A duct ventilation fan device according to the present invention has a box-shaped outer casing having a lower surface opened, a blower attached to the top surface, and an exhaust port provided on a side surface,
The upper surface is opened, the lower surface is provided with a suction port, and the blower is accommodated by being inserted into the outer casing, and an air passage is formed between the blower and a discharge port communicating with the exhaust port of the outer casing on the side surface. A fan casing provided with,
A decorative grille attached to the lower surface of the fan casing by a spring and closing the lower surface opening of the outer casing;
The fan casing is fixed to the outer casing by a plurality of screwing portions provided around the suction port.

  According to the present invention, since the vicinity of the suction opening of the fan casing is fixed to the outer casing with screws, it is easy to mount the fan casing to the outer casing, and the mounting workability and maintenance can be improved. .

It is sectional drawing which shows the state which installed the ventilation fan apparatus for ducts concerning one embodiment of this invention on the ceiling. It is explanatory drawing of the assembly procedure of the ventilation fan apparatus for ducts of FIG. It is a perspective view of the fan casing of FIG. It is explanatory drawing which shows the attachment structure of the fan casing to an outer casing. It is explanatory drawing which shows the attachment structure of the spring to a decorative grill. It is a partial structural explanatory view of the screwing portion provided in the fan casing.

  In FIGS. 1-3 which are one embodiment of this invention, 1 is a ventilation fan apparatus for ducts. 2 is a ventilation fan comprising a multi-blade blower 3 (hereinafter simply referred to as a blower) that is a ventilation drive body for circulating the air to be ventilated, and a box-shaped resin fan casing 6 in which the blower 3 is housed. 3 includes a motor 4 and a fan 5 that is rotationally driven by the motor 4.

  Reference numeral 20 denotes a box-shaped outer casing in which the ventilation fan 2 is housed, and the lower surface is open. A motor 4 of the blower 3 housed in the fan casing 6 is attached to the top surface of the outer casing. 21 is provided. A duct connection frame 22 is provided on the side surface of the outer casing 20 so as to communicate with the exhaust port 21, extend in a direction perpendicular to the side surface, and connect the duct 40 to the discharge port 23.

  The outer diameter of the duct connection frame 22 is formed in a stepped shape having different diameters. This is because the duct 40 to be connected can be dealt with even if the diameter of the duct 40 is different, and workability such as taping is taken into consideration. is there. The duct connection frame 22 is provided with a shutter 24 that opens and closes by wind pressure. The shutter 24 is opened by wind pressure when the blower 3 is in operation, and the duct connection frame 22 is closed by its own weight when stopped.

  By providing such a shutter 24, the duct connection frame 22 is closed when the blower 3 is stopped, thereby preventing outside air from entering the inside through the duct 40 from the outside. The duct 40 extends to the outside and is connected to a hood or the like provided on the outer wall of the building to constitute a ventilation air passage for ventilating indoor air.

  The fan casing 6 in which the blower 3 is accommodated has an upper surface opened and a suction port 7 having a bell mouth on the lower surface. The air sucked from the suction port 7 flows between the inner wall of the fan casing 6 and the blower 3. Flows along the air passage 8 formed between the discharge port 9 and the exhaust port 21 of the outer casing 20.

As shown in FIG. 2, the fan casing 6 is inserted into the outer casing 20 from the lower opening, and houses the blower 3 in which the motor 4 is attached to the top surface of the outer casing 20. As shown in FIG. 4, the fan casing 6 includes a plurality of L-shaped mounting brackets 25 provided below the inner wall of the outer casing 20 and screwing portions provided on the flange portion 10 on the outer periphery of the suction port 7. 11 are brought into contact with each other and fixed to the outer casing 20 by being screwed with screws 50 inserted from the lower surface.
In addition, a pair of spring mounting portions 15 for holding a decorative grill 30 that closes the lower surface opening of the outer casing 20 are provided on both sides of the suction port 7 of the flange portion 10 of the fan casing 6 so as to face each other. .

  As shown in FIG. 5, spring holding portions 31 are provided on the rear surface of the decorative grill 30 in correspondence with the spring mounting portions 16 provided on both sides of the suction port 7 of the fan casing 6. Reference numeral 35 denotes an arc-shaped leg portion 37a, 37b (for example, a radius of 3 mm) that opens in a substantially V shape on both sides of the coil portion 36 provided in the center and is biased in the expanding direction to be bent in a circular shape (for example, radius 3 mm). The coil portion 36 provided at the center portion is suspended and supported by the support pin 33 inserted into the hole 32 of the spring holding portion 31.

  As shown in FIG. 1, the decorative grill 30 has a leg portion 37 of a spring 35 that is inserted into the hole 16 of the spring mounting portion 15 of the fan casing 6 and opens on both sides, and the fan casing 6 is energized in the expanding direction. The decorative grille 30 is attached so that the periphery of the decorative grill 30 is in contact with the ceiling 45 and closes the lower surface opening of the outer casing 20.

  By the way, when the decorative grill 30 is attached to the fan casing 6 in this manner, the lower surface (flange portion) of the fan casing 6 at the passing position is placed on one leg portion 37 of the spring 35 inserted through the hole 16 of the spring attachment portion 15. 10), the screw 50 of the screwing part 11 (screwing part 11 provided on one side of the spring mounting part 16) interferes, and the urging force of the leg part 37 that pushes up the fan casing 6 decreases or acts. As a result, the lifting force of the decorative grill 30 is weakened and does not come into contact with the ceiling, resulting in poor mounting.

  Therefore, in the present invention, as shown in FIG. 6, the head portion of the screw 50 is applied to the screwing portion (indicated by 11a in FIG. 3) having the screw 50 that may interfere with the leg portion 37 of the spring 35. Protrusions 13a and 13b are provided on the lower surfaces of both sides of the flat portion 12 in contact therewith.

  The protrusions 13a and 13b are substantially triangularly formed downwardly by an inclined surface 14a (hereinafter referred to as an outer inclined surface) and an inner inclined surface 14b (hereinafter referred to as an inner inclined surface) of the protrusions 13a and 13b. In the embodiment, the inclination angle α of the outer inclined surface 14a is 29.5 °, and the inclination angle β of the inner inclined surface 14b is 30 based on a position 7 mm away from the center of the screw hole. °. In addition, since such protrusions 13a and 13b can be formed when the resin fan casing 6 is injection-molded, it is possible to use a conventional mold as it is with only slight processing.

  The inclination angle α of the outer inclined surface 14a of the protrusions 13a and 13b is formed substantially corresponding to the bending angle of the arc portion of the leg portion 37 of the spring 35 passing through the screwing portion 11a. When attached to the fan casing 6, the leg portion 37 of the spring 35 passes along the outer inclined surface 14 a, so that the screw 50 does not interfere with the spring 35. As a result, the decorative grill 30 is pulled up by the urging force of the spring 35, and its peripheral edge abuts against the ceiling 45 and is attached to the fan casing 6, thereby reliably closing the lower surface opening of the outer casing 20.

  In the above description, the projections 13a and 13b are provided on both sides of the screwing portion 11a. However, the projection 13a is provided only on the spring mounting portion 15 side (the passage side of the leg portion 37 of the spring 35). Also good.

According to the present invention, since the suction port 7 side of the fan casing 6 is fixed to the outer casing 20, the mounting operation is easy and the assemblability can be improved.
Further, since the duct ventilation fan device 1 is installed on the ceiling, it becomes a work at a high place. However, since the suction port 7 side of the fan casing 6 is fixed to the outer casing 20, it is easy to visually recognize, so that the maintainability can be improved. it can.

  Further, in order to prevent the screw 37 of the screwing portion for fixing the fan casing 6 to the outer casing 20 from interfering with the leg portion 37 of the spring 35 for attaching the decorative grill 30 to the fan casing 6. A protrusion 13a having an outer inclined surface 14a and protruding downward is provided at least on the spring mounting portion 15 side of the portion 11a. When the decorative grill 30 is attached to the fan casing 6, the leg portion 37 of the spring 35 is connected to the protrusion 13a. Since the screw 50 of the screwing portion 11a does not interfere with the spring 35, the decorative grill 30 can be securely attached at a predetermined position.

  In the above description, the case where the present invention is implemented in a duct ventilation fan device is shown, but the present invention can also be implemented in other blowers and air conditioners.

  DESCRIPTION OF SYMBOLS 1 Duct ventilation fan apparatus, 2 ventilation fan, 3 air blower, 4 motor, 5 fan, 6 fan casing, 7 suction port, 8 air path, 9 discharge port, 10 flange part, 11, 11a screwing part, 12 flat part, 13a, 13b Projection, 14a Outer inclined surface, 14b Inner inclined surface, 15 Spring mounting portion, 16 holes, 20 Outer casing, 21 Exhaust port, 22 Duct connection frame, 23 Discharge port, 24 Shutter, 25 Mounting bracket, 30 Cosmetic grille, 31 Spring holding part, 32 holes, 33 support pin, 35 spring, 36 coil part, 37a, 37b leg part, 40 duct, 45 ceiling, 50 screw.

Claims (4)

A box-shaped outer casing having a lower surface opened, a fan mounted on the top surface, and an exhaust port provided on the side surface;
The upper surface is opened, the lower surface is provided with a suction port, and the blower is accommodated by being inserted into the outer casing, and an air passage is formed between the blower and a discharge port communicating with the exhaust port of the outer casing on the side surface. A fan casing provided with,
A decorative grille attached to the lower surface of the fan casing by a spring and closing the lower surface opening of the outer casing;
A duct ventilation fan device, wherein the fan casing is fixed to the outer casing by a plurality of screwing portions provided around a suction port.   Spring mounting portions are provided opposite to both sides of the suction opening of the fan casing, provided on the back surface of the decorative grille in correspondence with the spring mounting portions, opened substantially in a V shape and biased in the expanding direction. A spring having a pair of legs is inserted into the spring mounting portion and pressed against the lower surface of the fan casing, and the decorative grille is mounted on the fan casing to close the lower surface opening of the outer casing. The ventilation fan device for a duct according to claim 1.   The ventilation fan device for a duct according to claim 2, wherein a protrusion having an inclined surface is provided on at least the spring mounting portion side of the screwing portion at the passage position of the spring of the fan casing.   The said fan casing was formed with resin, The ventilation fan apparatus for ducts in any one of Claims 1-3 characterized by the above-mentioned.

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