JP5213754B2 - Ventilation fan - Google Patents

Description

  The present invention relates to a ventilation fan that is installed in a ventilation pipe embedded in a room wall or a ceiling to perform ventilation.

  Conventionally, as a method of adjusting the air volume of an exhaust fan or an air supply fan, there is a method of reducing the air volume by reducing the torque of an electric motor (motor) and lowering the blade rotation speed. This method has a problem that the total closing pressure also decreases in proportion. In addition, if the torque of the motor is reduced, the startability of the motor is deteriorated, so that the torque of the motor may not be reduced.

  As a method of adjusting the air volume without reducing the total closing pressure, there is a method of reducing the air volume by reducing the air passage area by attaching an air volume adjusting plate to the grill grid portion without changing the torque of the electric motor. For example, when the pressure loss of the duct pipe is large in the ceiling exhaust, the high air pressure is emphasized because the air volume drop is large. When the pressure loss is small in the wall exhaust, the open air volume is emphasized because the air volume drop is small. In addition, high static pressure is emphasized in order to secure ventilation capacity in places where outside wind is strong even with wall exhaust.

  As a conventional ventilation fan equipped with an air volume adjusting plate, a fan for forced ventilation is arranged in a ventilation duct communicating with the interior and exterior of a building or the like, and the makeup is placed on the back of a decorative frame (grill) provided at the air inlet of the duct. In the ventilation fan in which the air volume adjusting plate for adjusting the air volume by closing a part of the ventilation opening formed in the frame is detachably attached, the air volume adjusting plate is an opening portion that communicates with a part of the ventilation opening of the decorative frame. And the area through which the opening communicates varies depending on the selection of the surface to be attached to the decorative frame, and a plurality of slits and crosspieces are used alternately for the ventilation opening of the decorative frame and the opening of the air volume adjusting plate. The width of the slit of the decorative frame and the width of the cross of the air volume adjusting plate are substantially the same, and the width of the cross of the decorative frame and the width of the slit of the air flow adjusting plate Almost identical Kiogi is disclosed (see Patent Document 1).

  Also, in a multi-chamber simultaneous intake / exhaust type exhaust fan body with a blade and an electric motor built in, an opening serving as a suction port on the lower surface, and a suction opening and a discharge opening connected to the duct on the side surface A suction grille having a central opening at the center and a peripheral opening at the periphery thereof is detachably provided at the opening of the lower surface of the ventilation fan body, and a plate piece is attached to the central opening of the suction grill, An air volume adjusting device for a ventilation fan for a duct, in which a piece is integrally formed with an air volume adjusting plate that covers a part of the peripheral opening, is disclosed (see Patent Document 2).

  In addition, a louver provided with a plurality of vent holes covering the intake port of the ventilation fan close to the outer periphery and symmetrically, and a rectangular plate shape so as to cover the vent port of this louver, and a flat shield at the center portion Provided with a plurality of parallel strips for notches symmetrically with respect to the shielding portion, and a shielding plate fixed by a fixture or the like. And an air volume adjusting device for a ventilation fan that adjusts the direction of the intake air flow (see Patent Document 3).

Japanese Patent No. 4035364 Japanese Utility Model Publication No. 04-42664 No. 04-51297

  However, since the conventional air volume adjusting plate is installed in the air passage, there is a problem that when the air passes, air flow unevenness is likely to occur partially and causes noise. In addition, when the air volume adjusting plate is installed on the suction side of the blade, the air flow unevenness causes a minute pressure fluctuation on the blade, and the noise is particularly likely to be directly affected.

  When the air volume adjusting plate is attached to the grill grid portion, normally, a plurality of air volume adjusting plate mounting portions are provided in order to prevent the air volume adjusting plate from floating or to prevent simple tilting. Further, in order to suppress deformation of the grill grid portion against an external force in the direction in which the air volume adjusting plate is pulled out due to air suction, the mounting force is usually provided on a plurality of grids to disperse the external force.

  When the same air flow rate adjusting plate is attached to the grilles having different grill grid intervals, the grid intervals are different, so that suitable fitting portions cannot be provided on the grid. A new hole that matches the lattice spacing is required for the air flow adjusting plate. Therefore, there is a problem that the air volume adjusting plate is full of holes and the design property is impaired. In order not to impair the designability, a dedicated air volume adjusting plate is required, and there is a problem that the type of air volume adjusting plate increases, productivity decreases, and costs increase.

  The ventilation fan attached to the wall surface easily allows light from the outside to be inserted into the room from the air passage opening. Some users feel this light uncomfortable. In this case, insertion of light can be reduced by a ventilation fan with a shutter or the like. However, a ventilating fan with a shutter is expensive and burdens the user. In addition, the ventilation fan with a shutter may not be installed due to a large product size. In addition, the manufacturer may not provide a ventilation fan with a shutter. Therefore, there is a demand for a ventilation fan that is inexpensive and can solve the above problems.

  Moreover, the color tone of the ventilation fan main body and the blade is usually the same color from the viewpoint of design, so that the blade is not visually conspicuous. Therefore, when the main body color tone is different, the color tone of the blades is made to correspond accordingly. Even if the shape is the same, blades of various colors are required, which causes a decrease in productivity and cost.

  The present invention has been made in view of the above, and a first object thereof is to obtain a ventilation fan provided with an air volume adjusting plate that can be easily mounted on grills having different lattice intervals without impairing the design. . The second object is to reduce the suction air flow unevenness of the air volume adjusting plate and to obtain a low-noise, low-cost and compact ventilation fan. The third object is to obtain a ventilation fan that can reduce the insertion of light from the outside into the room by the air volume adjusting plate and whose design is not affected by the color tone of the blades.

In order to solve the above-described problems and achieve the object, the present invention provides a wind tunnel installed in an indoor opening of a ventilation pipe, a propeller blade disposed in the wind tunnel and driven by a motor, and the wind tunnel A plurality of types of grills that cover the indoor side of the grille and have different lattice intervals at the openings, and a regular hexagonal or more regular hexagon that is attached to the back side of the grille and blocks a part of the opening of the grill to hide the propeller blades. In a ventilation fan comprising a polygonal or circular air volume adjusting plate, the air volume adjusting plate is provided with at least a pair of mounting holes separated by a predetermined distance at a point-symmetrical position with respect to the center of the air volume adjusting plate, A pair of protrusions for fitting with a pair of mounting holes of the air volume adjusting plate are provided on the back side of the grille grid .

  According to the present invention, the air volume adjusting plate can be easily attached to a grill having different lattice intervals without impairing the design, is low in noise, is low in cost, is compact, and transmits light from the outside to the room. Insertion can be reduced, and there is an effect that a ventilation fan can be obtained in which the design is not affected by the color tone of the blades.

FIG. 1 is a sectional view showing an embodiment of a ventilation fan according to the present invention. FIG. 2 is a rear view showing a state in which the circular air volume adjusting plate of the embodiment is attached to the grill. FIG. 3 is a rear view showing the circular air volume adjusting plate of the embodiment. FIG. 4 is a rear view showing a state in which a square air volume adjusting plate is attached to the grill. FIG. 5 is a rear view showing a modified example of the protrusions of the embodiment provided on the rear surface of the grill grid. FIG. 6 is a rear view showing another modified example of the protrusion of the embodiment provided on the rear surface of the grill grid. FIG. 7 is a rear view showing the grill of the embodiment in which the lattice spacing is different. FIG. 8 is a rear view showing a state in which a rectangular air volume adjusting plate is attached to a grill having different grid intervals. FIG. 9 is a rear view showing a state in which the air volume adjusting plate is attached at a position off the center of the grill. FIG. 10 is a longitudinal sectional view showing the ventilation fan of the embodiment in which the propeller blades are attached to the motor in the reverse direction. FIG. 11 is a front view of the ventilation fan according to the embodiment. FIG. 12 is a rear view showing a modification of the circular air volume adjusting plate of the embodiment. FIG. 13 is a rear view showing a state in which the air volume adjusting plate of the modification is attached to the grill. FIG. 14 is a rear view showing a state in which the air volume adjusting plate of the modified example is attached to a grill having different grid intervals. FIG. 15 is a rear view showing another modification of the circular air volume adjusting plate of the embodiment.

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

Embodiment FIG. 1 is a cross-sectional view showing an embodiment of a ventilating fan according to the present invention, and FIG. 2 is a rear view showing a state in which the circular air volume adjusting plate of the embodiment is attached to the grill. 3 is a rear view showing the circular air volume adjusting plate of the embodiment, FIG. 4 is a rear view showing a state in which the square air volume adjusting plate is attached to the grill, and FIG. 5 is a rear surface of the grill grid. FIG. 6 is a rear view showing another modification of the protrusion of the embodiment provided in FIG. 6, FIG. 6 is a rear view showing another modification of the protrusion of the embodiment provided on the back of the grille grid, and FIG. FIG. 8 is a rear view showing a grill according to an embodiment having different grid intervals, FIG. 8 is a rear view showing a state in which a rectangular air volume adjusting plate is attached to the grill having different grid intervals, and FIG. FIG. 10 is a rear view showing a state in which the adjustment plate is attached at a position off the center of the grill. FIG. 11 is a longitudinal sectional view showing a ventilating fan according to an embodiment in which propeller blades are attached to a motor in a reverse direction, FIG. 11 is a front view of the ventilating fan according to the embodiment, and FIG. 12 is a circular air volume according to the embodiment. FIG. 13 is a rear view showing a state in which the air volume adjusting plate of the modified example is attached to the grill, and FIG. 14 is a rear view showing the modified example of the air volume adjusting plate of the modified example. It is a rear view which shows the state attached to the different grill, and FIG. 15 is a rear view which shows the other modification of the circular air volume adjusting plate of embodiment.

  As shown in FIG. 1, a ventilation fan 91 according to the embodiment is installed in a room-side opening of a ventilation pipe 5, and has a cylindrical wind tunnel 3 that constitutes an air path, and a motor 1 that is disposed on the blowing side of the wind tunnel 3. And a propeller blade 2 attached to the rotating shaft of the motor 1 and disposed inside the wind tunnel 3, and a grill 8 disposed so as to cover the indoor side (suction side) of the wind tunnel 3.

  A bell mouth-like orifice portion 3 b is formed on the indoor side (suction side) of the wind tunnel 3, and a radially outward portion of the orifice portion 3 b is a flange portion 3 a for attaching the wind tunnel 3 to the chamber wall 4. A plurality of mounting legs 3c are provided on the blowing side of the wind tunnel 3, and a motor cover 3d that accommodates the rotating shaft side of the motor 1 is supported on the radially inner end of the mounting legs 3c. The motor 1 is fixed to the mounting leg 3 c by screws 15. The grill 8 is formed in a rectangular lid shape, and is fitted on the outer periphery of the flange portion 3a and held by the flange portion 3a.

  As shown in FIG. 2, a square opening 9 is formed in the grill 8. In the opening 9, 16 vertical lattices 10 are provided at equal intervals. Between the lattices 10 and 10 is a slit-shaped air vent 9a. In order to adjust the air volume of the ventilation fan 91, a circular air volume adjusting plate 11 (see FIG. 3) that closes a part (center) of the opening 9 is attached to the back side of the grill 8.

  The circular air volume adjusting plate 11 can be attached to the grille 8 by inserting a pair of protrusions 12 provided on the back side of the lattice 10 into a pair of holes 13 provided in the air volume adjusting plate 11. In order to ensure the design of the front side of the grill 8, the diameter of the protrusion 12 is formed to be equal to or smaller than the width of the grid 10 so that the protrusion 12 does not protrude from the grid 10 to the ventilation port 9 a.

  Although not shown, a vent cap is attached to the outdoor side opening of the ventilation pipe 5 to prevent intrusion of rainwater from the outside. When the ventilation fan 91 is attached to the ceiling, the ventilation pipe 5 and the vent cap are connected by a duct behind the ceiling.

  Next, the effect | action of the ventilation fan 91 of embodiment described above is demonstrated. When the ventilating fan 91 is operated, the propeller blade 2 rotates, and the indoor air passes through the opening 9 (ventilation opening 9a) of the grill 8 and is blown out to the propeller blade 2 and exhausted to the outside. The circular air volume adjusting plate 11 reduces the ventilation area of the opening 9 and adjusts the air volume. At this time, since the torque of the motor 1 is not reduced, the fully closed pressure does not decrease.

  2 and 3 is mounted at a position substantially concentric with the propeller blade 2, and the propeller blade 2 sucks air evenly from the entire periphery of the circular air flow adjusting plate 11. Compared with the case where the rectangular air volume adjusting plate 20 as shown in FIG. Therefore, noise due to uneven suction airflow of the propeller blades 2 can be reduced.

  The uneven suction air flow causes fine pressure fluctuations on the surface of the propeller blade 2 and causes an increase in noise. When air is supplied into the room by the ventilating fan 91, the air flow is in the reverse direction, resulting in a blown airflow. The noise is greater in the intake airflow of the exhaust than in the supply airflow.

  The air volume adjusting plate 11 shown in FIGS. 2 and 3 is circular, and a pair of holes 13 are provided in a point-symmetric position with respect to the center. A pair of protrusions 12 are provided on the back side of the lattice 10 of the grill 8 at the same interval as the distance 16 of the predetermined distance between the pair of holes 13, and the pair of holes 13 of the circular air volume adjusting plate 11 are fitted to the pair of protrusions 12. The air volume adjusting plate 11 is attached to the grill 8.

  The height of the protrusion 12 is set to be 1 mm or more higher than the thickness of the circular air volume adjusting plate 11. Since the pair of holes 13 of the circular air volume adjusting plate 11 are fitted to the pair of protrusions 12, the circular air volume adjusting plate 11 can be attached to the grill 8 with little floating from the back surface of the lattice 10. After the circular air volume adjusting plate 11 is attached to the grille 8, the tip of the protrusion 12 is crushed by ultrasonic welding or the like to prevent it from coming off. The circular air volume adjusting plate 11 is attached to the back surface of the grill 8 and does not appear on the grill surface, so that the grill 8 has a good appearance.

  As shown in FIG. 5, the pair of protrusions 12 may be provided at the center in the height direction of the lattice 10. Further, as shown in FIG. 2, the protrusions 12 are spaced apart from each other in the vertical direction from the center in the height direction of the lattice 10. It may be provided. With respect to the external force in the pulling direction of the circular air volume adjusting plate 11 generated by the suction of the propeller blades 2, the position of the projection 12 shown in FIG. Further, the floating of the circular air volume adjusting plate 11 is reduced.

  Further, as shown in FIG. 6, when the rigidity and strength of the lattice 10 are sufficient, a pair of protrusions 12 may be provided on one lattice 10. Furthermore, one hole is provided in the center of the circular air volume adjusting plate 11, and one protrusion is provided in the vertical center of the lattice 10 at the center in the left-right direction of the grille 8, and the circular air volume adjusting plate 11 is fitted by fitting them together. It may be attached to the grill 8.

  As shown in FIG. 7, even if the grill 18 has a different interval between the lattices 17 of other ventilation fans having different sizes, the interval dimension 16 between the pair of holes 13 of the circular air flow adjusting plate 11 is provided on another lattice 17. By providing the pair of protrusions 19 at the same interval, the same circular air volume adjusting plate 11 can be used. Further, even if the type and the size of the outer shape of the circular air volume adjusting plate are changed, it can be attached by setting the interval dimension 16 of the pair of holes 13 to the same interval dimension as the pair of protrusions of the grill.

  As shown in FIG. 7, the position of the pair of holes 13 of the air volume adjusting plate 11 is inclined and attached, but since the air volume adjusting plate 11 is circular, the air volume adjusting plate 11 viewed from the front side of the grill 18. There is no change and the design is not impaired. Further, in order to further ensure the attachment of the air volume adjusting plate 11, as shown in FIG. 12, a long hole 13B is provided at a position rotated by 90 ° from the hole 13 of the air volume adjusting plate 11, and as shown in FIG. Protrusions 12 that fit into the holes 13B may be provided on the lattice 10 of the grill 8 to increase the number of attachment points. As shown in FIG. 14, even if the grill 18 has a different spacing between the grids 17 of other ventilation fans having different sizes, the two pairs of holes 13, 13 </ b> B of the circular air volume adjusting plate 11 are formed in another grid 17. By providing two pairs of protrusions 19 at the same interval as the interval dimension 16, the same circular air volume adjusting plate 11 can be used. Also, even if the type of circular air volume control plate and the size of the outer shape change, the distance between the two pairs of holes 13 and 13B is set to the same distance as the two pairs of protrusions on the grill. Can do. Further, as shown in FIG. 15, instead of the long hole 13 </ b> B, a plurality of holes 13 </ b> C may be provided in the air volume adjusting plate 11 and attached to the grill 8 and the grill 18.

  FIG. 8 is a rear view showing a state in which the rectangular air volume adjusting plate 20 shown in FIG. 4 is attached to the grille 18 having different grid intervals. When the rectangular airflow rate adjusting plate 20 is attached to the grille 18 having a different interval between the lattices 17, the rectangular airflow rate adjusting plate 20 is inclined, and there is a change in appearance, which impairs the design.

  As shown in FIG. 9, the circular air volume adjusting plate 11 may be attached at a position off the center of the grill 8, but it is attached at the center of the grill 8 and is arranged concentrically with the propeller blade 2 so as to be even from the periphery. When air is sucked in, there is less airflow unevenness and noise is reduced.

  If the motor 1 of the exhaust fan 91 shown in FIG. 1 is rotated in the reverse direction, the air flow is reversed, and the exhaust fan for supplying air can be obtained. Also in the case of a ventilation fan for supplying air, the air volume can be adjusted by reducing the area of the opening 9 by the circular air volume adjusting plate 11. Further, as shown in FIG. 10, if the propeller blades 2 of the exhaust fan 91 shown in FIG. 1 are attached to the motor 1 in the reverse direction and the motor 1 is rotated in the reverse direction, a ventilator for supplying air can be obtained. . The latter is superior in open air volume and static pressure characteristics than the former.

  As described above, by using the circular air volume adjusting plate 11 according to the embodiment, noise due to uneven suction airflow can be reduced, and the productivity can be improved by sharing parts and the manufacturing cost can be reduced. be able to.

  As shown in FIG. 11, by attaching a circular air volume adjusting plate 11 in front of the orifice portion 3 b of the wind tunnel 3, the opening of the wind tunnel 3 is hidden and light insertion from the outside into the room can be reduced. . As the circular air volume adjusting plate 11 is larger, the light insertion amount is reduced, but the air volume is also reduced.

  In the case of a ventilation fan for pipes, Φ100 mm to Φ150 mm is most commonly used as the inner diameter of the ventilation pipe 5. Therefore, considering the air volume adjustment and the circular air volume adjustment board 11, the outer diameter of the circular air volume adjustment board 11 As for the dimension, Φ60 mm to Φ150 mm is an appropriate range. Further, since the wind tunnel 3 is formed in a cylindrical shape for insertion into the cylindrical ventilation pipe 5 and the outer shape of the propeller blade 2 is also circular, the circular air volume adjusting plate 11 impairs the design of the ventilation fan 91. Absent.

  Although the air volume adjusting plate 11 of the embodiment is circular, the air volume adjusting plate may be a regular polygon of a regular hexagon or more. In this case, the same effect as the circular air volume adjusting plate 11 can be obtained. In the case of a regular polygon, the opposite side distance is 60 mm to 150 mm.

  As described above, the ventilating fan 91 according to the embodiment does not require a shutter in order to reduce the insertion of light from the outdoors. The ventilating fan with a shutter opens the shutter during operation, and thus has a drawback that light is often inserted during operation. However, the circular air volume adjusting plate 11 can reduce light insertion during operation. In addition, the circular air volume adjusting plate 11 can be easily attached to the back surface of the grill 8 and does not appear on the surface of the grill 8, thus providing a good-looking ventilation fan.

  Furthermore, since the propeller blades 2 are mostly hidden by the circular air volume adjusting plate 11, even if the propeller blades 2 have a color tone different from that of the flange portion 3a of the ventilation fan body, the design of the ventilation fan 91 is not impaired. Therefore, it is possible to use the propeller blade 2 having a color tone adapted to another ventilation fan. Thereby, it is not necessary to prepare many types of propeller blades 2 having different colors, and productivity can be improved by sharing the components of the propeller blades 2.

  The circular air volume adjusting plate 11 can be manufactured from a sheet-like thin plate material. As the thin plate material, PVC, PC, PP, ABS, PE resin or the like can be used. Since it is manufactured by punching, the plate thickness of the thin plate material is suitably 0.3 to 1.0 mm. If a thin plate material is used, a punching tool is cheaper and processing is easier than a resin molded product, and the manufacturing cost can be reduced.

  As described above, the ventilation fan according to the present invention is useful as a ventilation fan for pipes.

DESCRIPTION OF SYMBOLS 1 Motor 2 Propeller blade | wing 3 Wind tunnel 3a Flange part 3b Orifice part 3c Mounting leg 3d Motor cover 4 Chamber wall 5 Ventilation pipe 8 Grill 9 Opening 9a Ventilation port 10 Grid 11 Circular air volume adjustment plate 12 Protrusion 13 Hole 15 Screw 16 Spacing dimension 17 Lattice 18 Grill 19 Protrusion 20 Rectangular air volume adjusting plate 91 Ventilation fan

Claims (4)

A wind tunnel installed at the indoor opening of the ventilation pipe;
A propeller blade disposed in the wind tunnel and driven by a motor;
A plurality of types of grills that cover the indoor side of the wind tunnel and have different lattice intervals of the openings ,
An equilateral hexagon or more regular polygonal or circular air volume adjusting plate which is attached to the back side of the grill and closes a part of the opening of the grill and hides the propeller blade;
In a ventilation fan comprising:
The air volume adjusting plate is provided with at least a pair of mounting holes at a predetermined distance apart at a point-symmetrical position with respect to the center of the air volume adjusting plate,
A ventilating fan comprising a pair of protrusions fitted to a pair of mounting holes of the air volume adjusting plate on the back side of the grille grid . The ventilation fan according to claim 1 , wherein the pair of protrusions are provided on separate grids of the grill. The ventilation fan according to claim 1 or 2 , wherein the air volume adjusting plate has an opposite side dimension or an outer diameter dimension of 60 mm to 150 mm. The ventilation fan according to any one of claims 1 to 3 , wherein the air volume adjusting plate is manufactured by punching from a thin plate resin material having a thickness of 0.3 mm to 1 mm.

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