JP2012097982A - Ventilation fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower capable of reducing closing sounds of a wind pressure shutter.SOLUTION: A ventilation fan includes a body frame 3, a motor 5 in the body frame 3, an impeller 6 rotated by the motor 5, and the plate-like wind pressure shutter 11 opened and closed around a rotary shaft 10 extended from the body frame 3 by a wind generated by the rotation of the impeller. The wind pressure shutter 11 includes a packing 14 in its lower end 16. In the wind pressure shutter 11, the distance between the lower end 16 and the rotary shaft 10 is longer than the distance between an upper end 15 of the wind pressure shutter 11 and the rotary shaft 10. When the wind pressure shutter 11 is closed, the body frame 3 and the upper end 15 are contacted, and then, the body frame 3 and the lower end 16 are contacted via the packing 14. By the constitution, a speed of contact at the lower end is reduced, and moreover, the contact is made via the packing. Thus, the ventilation fan capable of reducing the closing sounds of the wind pressure shutter can be obtained.

Description

  The present invention relates to a ventilation fan having a shutter.

  Conventionally, this type of ventilation fan is equipped with an electric motor consisting of an electric motor and an impeller on the main body of the ventilation fan mounted in the wall hole, and a grill that forms a suction port is provided on the indoor side. A device that is mounted and has a wind pressure shutter on the discharge port side and is movable by wind pressure for backflow prevention is known (for example, see Patent Document 1).

  Hereinafter, a conventional ventilation fan will be described with reference to FIG.

  As shown in FIG. 4, a main body 101 of a ventilation fan mounted in a wall hole is provided with a blower unit including an electric motor 102 and an impeller 103, and a grill 104 that forms a suction port is provided on the indoor side. A wind pressure shutter 106 is provided on the discharge port 105 side.

  By operating a conventional ventilation fan, the air pressure shutter 106 opens when indoor air is discharged.

JP-A-6-185773

  In such a conventional ventilation fan, when the wind pressure shutter is closed due to operation stop or the like, there is a problem that the closing sound of the wind pressure shutter generated by the contact between the main body and the wind pressure shutter is large.

  This invention solves such a conventional subject, and it aims at providing the air blower with which the closing sound of a wind pressure shutter is reduced.

  In order to achieve this object, the present invention provides a main body frame provided in a vertical wall opening that communicates indoors and outdoors, a motor in the main body frame, an impeller rotated by the motor, and the rotation of the impeller. A plate-like wind pressure shutter that opens and closes around a rotation shaft extending from the main body frame, and the wind pressure shutter has a shrinkable packing on the indoor side surface of the lower end portion. And the rotation axis is longer than the distance between the upper end of the wind pressure shutter and the rotation axis, and when the wind pressure shutter is closed, after contact with the main body frame and the upper end, packing is performed between the main body frame and the lower end. It is characterized by having a structure in contact with each other, thereby achieving the intended purpose.

  According to the present invention, the contact with the main body when the wind pressure shutter is closed is brought into contact via the packing at the lower end portion after the contact at the upper end portion of the wind pressure shutter. Since the distance to the upper end is short, only a slight contact noise is generated, and the speed at which the wind pressure shutter closes is attenuated by the contact at the upper end, so that the contact speed at the lower end is reduced, and the packing is Therefore, the effect of reducing the closing sound of the wind pressure shutter can be obtained.

Side sectional view of the ventilation fan according to the first embodiment of the present invention. 1 is a perspective view of a wind pressure shutter according to a first embodiment of the present invention. 1 is an exploded perspective view of a ventilation fan according to a first embodiment of the present invention. Side cross-sectional view of a conventional ventilation fan

  The ventilation fan according to claim 1 of the present invention includes a main body frame provided in a vertical wall opening that communicates indoors and outdoors, a motor in the main body frame, an impeller rotated by the motor, and rotation of the impeller. A plate-like wind pressure shutter that opens and closes around a rotation shaft extending from the main body frame, and the wind pressure shutter has a shrinkable packing on the indoor side surface of the lower end, and the wind pressure shutter The distance between the lower end portion and the rotating shaft is longer than the distance between the upper end portion of the wind pressure shutter and the rotating shaft, and when the wind pressure shutter is closed, after contact with the main body frame and the upper end portion. The main body frame is in contact with the lower end via the packing. Thereby, the contact with the main body when the wind pressure shutter is closed is brought into contact via the packing at the lower end portion after the contact at the upper end portion of the wind pressure shutter. Since the distance of the air is short, only a slight contact noise is generated, and the speed at which the wind pressure shutter closes is attenuated by the contact at the upper end, so that the contact speed at the lower end is reduced, and the contact through the packing is reduced. Since it becomes contact, there exists an effect that the closing sound of a wind pressure shutter is reduced.

  Further, the main body frame may be provided with a protrusion that contacts the packing at the lower end of the wind pressure shutter, and the protrusion may be sufficiently small with respect to the lateral width of the wind pressure shutter. As a result, the contact area between the wind pressure shutter and the lower end part, which is stronger than the upper end part, is reduced, and furthermore, since the width of the projecting part of the packing is small, the size of the packing can also be reduced. The closing sound of the wind pressure shutter is greatly reduced, and the cost of packing can be reduced.

  The main body frame may include a rib that contacts the upper end portion of the wind pressure shutter, and the rib may be sufficiently thin with respect to the lateral width of the wind pressure shutter. Thereby, since the area which an upper end part and a wind pressure shutter contact becomes small, there exists an effect that the closing sound of a wind pressure shutter is reduced.

  Further, the wind pressure shutter may be provided with a weight at the upper end, and the position of the center of gravity in the vertical direction may coincide with the position of the rotation axis. This makes it possible to open and close with less force by matching the position of the center of gravity of the wind pressure shutter and the position of the rotation axis of the wind pressure shutter, and the closing speed of the wind pressure shutter becomes slow, so that the closing sound of the wind pressure shutter is reduced. The effect that it is done.

  Moreover, you may make it the structure provided with an air supply path in a main body frame. As a result, when the wind pressure shutter opens and closes due to a pressure difference between the inside and outside of the room, the wind enters and exits from the air supply passage, so the force applied to the wind pressure shutter is weakened, and the closing speed of the wind pressure shutter is slowed. There is an effect that is reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 is a side sectional view of a ventilation fan according to a first embodiment of the present invention.

  In the figure, a ventilation fan 1 includes a main body frame 3 provided in a vertical wall opening 2 that communicates indoors and outdoors, an exhaust passage 4 in the main body frame 3, a motor 5 in the exhaust passage 4, and a blade that is rotated by the motor 5. The vehicle 6, the orifice 7 having a bell mouth-like suction port on the indoor side, the louver 8 covering the indoor side of the main body frame 3, the discharge port 9 on the outdoor side, and the rotary shaft 10 extending from the main body frame 3 are penetrated. A plate-like wind pressure shutter 11 that opens and closes around the rotation shaft 10 is provided. The impeller 6 is structured to be detachable from the motor 5 without using a tool.

  The main body frame 3 includes a rib 12 at the upper part of the discharge port 9 and a protrusion 13 at the lower part. Further, the wind pressure shutter 11 includes a packing 14 having contraction on the indoor side surface. When the wind pressure shutter 11 is closed, the wind pressure shutter 11 is connected to the rib 12 on the outdoor side surface of the upper end portion 15 of the wind pressure shutter. They contact each other and come into contact with the protruding portion 13 via the packing 14 on the indoor side surface of the lower end portion 16 of the wind pressure shutter. Note that the rib 12, the protrusion 13, and the packing 14 are sufficiently small with respect to the width of the wind pressure shutter 11. Further, the main body frame 3 includes a second rib 20, and when the wind pressure shutter 11 is opened, as shown by a broken line in FIG. 1, the upper end portion 15 contacts the second rib 20, and the wind pressure is further increased. The shutter 11 does not open.

  Here, FIG. 2 shows a perspective view of the wind pressure shutter 11. In the figure, the wind pressure shutter 11 is provided with through-holes 17 on the left and right, and is attached to the main body through the rotation shaft 10 of the main body frame 3 passing therethrough. Further, the wind pressure shutter 11 has a diaphragm structure, and has a shape with bends on both sides. Moreover, the part provided with the packing 14 has a recessed shape. Further, the through-hole 17 is subjected to burring. The wind pressure shutter 11 is made of aluminum.

  Further, the distance between the through-hole 17 and the lower end 16 is longer than the distance between the through-hole 17 and the upper end 15, and this also applies to the positional relationship with the rotary shaft 10.

  A weight 18 is provided at the upper end of the wind pressure shutter 11, and the center of gravity of the wind pressure shutter 11 provided with the weight 18 coincides with the position of the rotary shaft 10.

  Further, an air supply passage 19 partitioned from the exhaust passage 4 is provided. Here, FIG. 3 shows an exploded perspective view of the ventilation fan. In the figure, an air supply passage 19 is provided on the left side of the exhaust passage 4.

  A hood 21 is provided so as to cover the discharge port 9, and the hood 21 is provided with a plurality of slits 22. The opening angle in a state where the wind pressure shutter 11 is in contact with the second rib 20 is an angle that opens to a range where the slit 22 of the hood 21 is provided.

  In the above configuration, when the impeller 6 is rotated by the motor 5, wind flows into the exhaust passage 4 from the indoor side toward the outdoor side, and when the air is discharged to the outdoor side, the lower end 16 side of the wind pressure shutter 11 is directed upward. Operates to open. Further, when the operation of the motor 5 is stopped, the wind stops and the wind pressure shutter 11 is closed. At this time, after the upper end portion 15 and the rib 12 are in contact with each other, the packing 14 is sandwiched between the lower end portion 16 and the wind pressure shutter 11 and contracts. Further, when the wind flows from the exhaust passage 4, the air pressure on the indoor side decreases, so that the air from the outdoor side to the indoor side is generated in the air supply passage 19.

  At this time, the contact with the main body when the wind pressure shutter 11 is closed is brought into contact via the packing 14 of the lower end portion 16 after the contact with the upper end portion 15 of the wind pressure shutter 11. Since the distance between the rotating shaft 10 and the upper end portion 15 is short, only a slight contact sound is generated, and the contact speed at the lower end portion 16 is reduced because the closing speed of the wind pressure shutter 11 is attenuated by the contact at the upper end portion. Since it is reduced and contact is made via the packing 14, the closing sound of the wind pressure shutter 11 is reduced.

  Further, since the contact between the lower end portion 16 and the wind pressure shutter 11 that is stronger than the upper end portion 15 is the contact with the projection 13 and the packing 14 having a small width, the contact area is reduced, and the packing 14 is further reduced. Since the width of the projecting portion 13 to be contacted is small, the size of the packing 14 can be reduced, so that the closing sound of the wind pressure shutter 11 is greatly reduced, and the cost of the packing 14 can be reduced.

  Moreover, since the area which the upper end part 15 and the wind pressure shutter 11 contact becomes small, the closing sound of the wind pressure shutter 11 is reduced.

  Further, the gravity center position of the wind pressure shutter 11 coincides with the rotation shaft 10, and the gravity center position and the rotation shaft 10 position are above the wind pressure shutter 11, and the area of the wind pressure shutter 11 below the rotation shaft 10. Since the wind pressure shutter 11 is wide and the area that receives wind is large, the wind pressure shutter 11 can be opened even with weak wind force. Further, when the operation is stopped, the rotational speed of the impeller 6 gradually decreases, that is, the wind gradually decreases. However, since the wind pressure shutter 11 is opened even in a weak wind, the wind pressure shutter 11 is stopped when the operation is stopped. Is gradually closed at a slower speed, so that the closing sound of the wind pressure shutter 11 is reduced.

  Further, since the air supply passage 19 is provided, a phenomenon in which the indoor air pressure rapidly decreases, for example, when an operation such as opening the door provided in the room with force is performed, the wind pressure shutter 11 has an indoor side. A closing force is applied due to a decrease in the atmospheric pressure, but since the flow of air from the air supply passage 19 reduces the variation in the atmospheric pressure, the force applied to the wind pressure shutter 11 is reduced, and the closing speed of the wind pressure shutter 11 is reduced. The closing sound of the shutter 11 is reduced. Note that the position of the air supply passage 19 may be any of the upper, lower, left and right positions of the exhaust passage 4, and the same effect can be obtained.

  Moreover, since the impeller can be removed without using a tool, it can be easily removed and is easy to clean.

  Further, the maximum opening angle of the wind pressure shutter 11 is adjusted by the second rib 20, which is an optimal opening angle with respect to the slit 22 of the hood 21. Since the closing speed of the shutter 11 does not increase, the closing sound of the wind pressure shutter 11 is reduced.

  Further, the wind pressure shutter 11 has a diaphragm structure, and both sides are bent, so that it has a strong structure without increasing the plate thickness.

  Moreover, since the position where the packing 14 is stuck is depressed, the mounting position of the packing 14 can be easily confirmed.

  Moreover, since the through-hole 17 is burring processed, the contact area with the rotating shaft 10 increases, it becomes difficult to be damaged, and there is no fear that the rotating shaft 10 breaks due to the scratch.

  Further, since the wind pressure shutter 11 is made of aluminum and lightweight, the wind pressure shutter 11 is opened even with a weak force, and when the operation is stopped, the wind pressure shutter 11 is gradually closed at a slower speed, so that the closing sound of the wind pressure shutter 11 is reduced. Is done.

  The ventilation fan according to the present invention is widely useful for a ventilation fan provided with a wind pressure shutter.

DESCRIPTION OF SYMBOLS 1 Ventilation fan 2 Vertical wall opening 3 Main body frame 4 Exhaust passage 5 Motor 6 Impeller 7 Orifice 8 Louver 9 Discharge port 10 Rotating shaft 11 Wind pressure shutter 12 Rib 13 Protrusion part 14 Packing 15 Upper end part 16 Lower end part 17 Through-hole 18 Weight 19 Supply Air passage 20 Second rib 21 Hood 22 Slit

Claims (5)

A main body frame provided in a vertical wall opening communicating with the inside and outside of the room, a motor in the main body frame, an impeller rotated by the motor, and a rotation extending from the main body frame by wind generated by the rotation of the impeller A plate-like wind pressure shutter that opens and closes about an axis, and the wind pressure shutter has a shrinkable packing on the indoor side surface of the lower end, and the distance between the lower end and the rotation shaft in the wind pressure shutter Is longer than the distance between the upper end of the wind pressure shutter and the rotation shaft, and when the wind pressure shutter is closed, the main frame and the lower end contact the packing after the main frame and the lower end. Ventilation fan characterized by having a structure in contact with each other. 2. The ventilation fan according to claim 1, wherein the main body frame includes a protruding portion that contacts a packing at a lower end portion of the wind pressure shutter, and the protruding portion is sufficiently small with respect to a lateral width of the wind pressure shutter. The ventilation fan according to claim 1 or 2, wherein the main body frame includes a rib that comes into contact with an upper end portion of the wind pressure shutter, and the rib is sufficiently thin with respect to a lateral width of the wind pressure shutter. The ventilation fan according to any one of claims 1 to 3, wherein the wind pressure shutter includes a weight at an upper end portion, and a vertical center of gravity position coincides with a position of the rotation axis. The ventilation fan according to any one of claims 1 to 4, further comprising an air supply passage in the main body frame.

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