JP2019143925A - Shutter for ventilator - Google Patents

Abstract

To obtain a shutter for a ventilator which can suppress an abnormal sound, abnormal vibration and short life of a connecting part of a connecting plate resulting from an attachment structure of the connecting plate.SOLUTION: A shutter blade has a blade flange 15 connected to a connecting plate 12. The blade flange 15 and the connecting plate 12 are arranged in a state that an in-plane direction of the blade flange 15 and an in-plane direction of the connecting plate 12 are opposed to each other in a parallel state. By inserting the connecting part having a metal-made protrusive component which is provided while vertically protruding from an opposing face opposite to the other in any one of the blade flange 15 and the connecting plate 12 toward the other, and a resin layer arranged at an outer peripheral face of the protrusive component, into an insertion hole provided at the opposing face opposite to the one in the other, the shutter blade and the connecting plate 12 are connected to each other.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a ventilation fan shutter including a plurality of shutter blades.

  Conventionally, a ventilation fan having a shutter that opens and closes in conjunction with the operation of the ventilation fan body is known. The ventilation fan opens the shutter when the operation of the ventilation fan body starts, and supplies air from the outside to the room or exhausts the room to the outside. The ventilation fan closes the shutter at the end of the operation of the ventilation fan body, thereby preventing the outside air from entering the room while the operation is stopped. In addition, a wind pressure type shutter used for a ventilation fan is provided with a plurality of blades connected by a connecting plate, and the opening and closing of the blades is performed synchronously using the wind pressure of the wind generated by the ventilation fan.

  As an example of a connecting plate mounting structure, Patent Document 1 discloses a connecting plate that is provided on the left and right side surfaces of the shutter plate support bracket and rotatably with respect to the shutter plate support bracket at the center in the heel direction. Has been. The connecting plate is provided so as to be rotatable with respect to the shutter plate support fitting by passing a bush through a through hole provided in the connecting plate.

JP 2011-080650 A

  However, in general, a resin bush is used for a connecting part that connects the connecting plate and the shutter plate support fitting. When the blade is open, the bush receives stress in the direction in which the blade rotates from the shutter plate support fitting, and receives downward stress in the vertical direction due to the weight of the connection plate from the connection plate. Since these stresses act on the bush as shear stress in a direction inclined with respect to the axial direction of the bush, the bush is inclined with respect to the axial direction of the bush. As a result, the inner peripheral surface of the through hole of the connecting plate and the outer peripheral surface of the bush are not in surface contact but in point contact. For this reason, when an excessive stress is applied to a specific portion of the bush, wear deterioration of the bush is accelerated, and the life of the bush may be shortened.

  In addition, a gap exists between the through hole of the connecting plate and the bush so that the connecting plate can be rotated. For this reason, the contact between the through hole of the connecting plate and the bush becomes a point contact at the corner of the through hole, which causes abnormal noise and vibration when the blade opens and closes compared to the case of surface contact. There was a problem that it was easy.

  The present invention has been made in view of the above, and is a ventilation fan capable of suppressing abnormal noise, abnormal vibration, and shortening of the life of the connecting parts of the connecting plate due to the mounting structure of the connecting plate connecting the plurality of shutter blades. The purpose is to obtain a shutter.

  In order to solve the above-described problems and achieve the object, a shutter for a ventilation fan according to the present invention includes a shutter frame provided with an opening through which an air flow generated in the ventilation fan body passes, and both side plates of the shutter frame in the left-right direction. Rotating operation is supported freely with the support shaft provided on the fulcrum, and a plurality of shutter blades that open and close the opening of the shutter frame and a connection that is connected to the plurality of shutter blades and that allows the plurality of shutter blades to rotate simultaneously. A board. The shutter blade has a blade flange connected to the connecting plate. The blade flange and the connecting plate are arranged to face each other with the in-plane direction of the blade flange and the in-plane direction of the connecting plate being parallel to each other. A connection having a metal convex part provided so as to project vertically from the surface facing the other of the blade flange and the connection plate to the other, and a resin layer disposed on the outer peripheral surface of the convex part The shutter blade and the connecting plate are connected by inserting the component through an insertion hole provided on the surface facing the other on the other side.

  According to the present invention, it is possible to obtain a shutter for a ventilation fan that can suppress abnormal noise, abnormal vibration, and shortening of the life of a connecting part of the connecting plate due to the mounting structure of the connecting plate that connects a plurality of shutter blades. Play.

The perspective view of the ventilation fan containing the shutter concerning Embodiment 1 of this invention. The perspective view which shows the shutter concerning Embodiment 1 of this invention. Side view of the shutter when the shutter blade according to the first exemplary embodiment of the present invention has an opening. FIG. 4 is a side view showing a connecting portion of the shutter frame, the shutter blade, and the connecting plate according to the first embodiment of the present invention, and is an enlarged view of a part of FIG. It is sectional drawing which shows the connection board connection part concerning Embodiment 1 of this invention, and sectional drawing along the VV line of FIG. It is a side view which shows the structural example of the metal pin concerning Embodiment 1 of this invention, (a) shows the 1st metal component which comprises a metal pin, (b) is the 2nd metal component which comprises a metal pin. Figure showing Sectional drawing which shows the connection structure of the shutter blade and connecting plate in the shutter concerning Embodiment 2 of this invention. The side view which shows the connection components concerning Embodiment 3 of this invention.

  Below, the shutter for ventilation fans concerning the embodiment of the invention is explained in detail based on a drawing. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a ventilation fan 3 including a shutter 1 according to a first embodiment of the present invention. The ventilation fan 3 includes a shutter 1 and a ventilation fan body 2. The ventilation fan body 2 includes a fan 21 and a ventilation fan frame 22. The fan 21 includes a blade 23 and a fan motor 24 that is a driving source of the blade 23. The fan motor 24 is supported on the ventilation fan frame 22 by four support legs 26. The four support legs 26 are components that extend radially from the fan motor 24 to the ventilation fan frame 22. In the center of the ventilation fan frame 22, a wind tunnel portion 25 that is a ventilation path of the ventilation fan body 2 is provided. The blades 23 rotate in the wind tunnel portion 25 as the fan motor 24 is driven, and generate an air flow that passes through the wind tunnel portion 25 and an opening 13 of the shutter 1 described later.

  FIG. 2 is a perspective view showing the shutter 1 according to the first embodiment of the present invention. In FIG. 2, the front side of the paper is the indoor side, and is the side on which the ventilation fan body 2 is arranged. In FIG. 2, the back side of the paper is outdoors. FIG. 2 shows a state in which the shutter blade 11 is opened when the opening 13 is opened. FIG. 3 is a side view of the shutter 1 when the shutter blade 11 according to the first exemplary embodiment of the present invention opens the opening 13. 4 is a side view showing a connecting portion of the shutter frame 10, the shutter blade 11, and the connecting plate 12 according to the first embodiment of the present invention, and is an enlarged view of a part of FIG. . The shutter 1 is a wind pressure type ventilation fan shutter that is installed together with the ventilation fan 3 and opens and closes in conjunction with the operation of the ventilation fan body 2. The wind pressure shutter is a shutter that opens and closes by the wind pressure of the wind generated by the fan 21 of the ventilation fan 3.

  The shutter 1 includes a shutter frame 10 provided with an opening 13 and a plurality of shutter blades 11 that are rotatably supported by the shutter frame 10 and open and close the outdoor side of the rectangular opening 13 by rotation. The shutter frame 10 is a frame component that surrounds the rectangular opening 13 and has a rectangular outer shape. A shutter flange 19 is provided on the outer edge of the shutter frame 10. The shutter flange 19 is overlapped with the ventilation fan frame 22 and fixed to the wall of the building.

  The plurality of shutter blades 11 are arranged in the vertical direction which is the first direction in the shutter 1. The first direction is the X direction in FIG. The air flow generated by the operation of the ventilation fan body 2 flows from the ventilation fan body 2 through the opening 13 to the outdoor side.

  The shutter 1 includes a connecting plate 12 that is connected to a plurality of shutter blades 11 and is an inter-blade connecting component that simultaneously rotates the plurality of shutter blades 11 to simultaneously open and close them. The connecting plate 12 is disposed on the back side on the end side in the horizontal direction, which is the second direction in the shutter 1 and is the direction perpendicular to the vertical direction. The second direction is the Y direction in FIG. In the shutter 1, the side on which the ventilation fan body 2 is disposed is the front side, and the outdoor side is the back side. In FIG. 2, the connecting plate 12 is disposed on the right side on the back side when the shutter 1 is viewed from the front side.

  The shutter blade 11 is a blade-like component arranged with the horizontal direction as the longitudinal direction. In FIG. 3, the longitudinal direction of the shutter blade 11 is a direction perpendicular to the paper surface of FIG. The length of the shutter blade 11 in the longitudinal direction corresponds to the lateral width of the opening 13. When the shutter blade 11 opens the opening 13, one end portion 11 a, which is a portion on one end side in the direction orthogonal to the longitudinal direction of the shutter blade 11 and a portion closer to the lower end, is pushed up and moved to the outdoor side. The other end portion 11b of the shutter blade 11 on the other end side in the direction orthogonal to the longitudinal direction and closer to the upper end is pushed down to move indoors. Further, when the shutter blade 11 closes the opening 13, one end portion 11 a is pushed down to move to the indoor side, and the other end portion 11 b is pushed up to move to the outdoor side.

  By reducing the width of the shutter blade 11 in the direction perpendicular to the longitudinal direction, the shutter 1 reduces interference between the shutter blade 11 and the object on the outdoor side of the shutter 1 when the opening 13 is opened. It is possible. Moreover, hemming bending is given to the edge part in the direction orthogonal to a longitudinal direction among the shutter blades 11. FIG. Further, a surface directed upward when the opening 13 is open is referred to as a front surface, and a surface directed downward is referred to as a back surface. The shutter blade 11 is bent so that the front surface is a mountain. The shutter 1 shown in FIG. 2 includes six shutter blades 11. Note that the number of shutter blades 11 provided in the shutter 1 is not limited to six and may be a plurality.

  The shutter 1 includes a connecting plate 12 that is a long component arranged with the vertical direction as a longitudinal direction. The connecting plate 12 is L-shaped steel having an L-shaped cross section in a cross section perpendicular to the longitudinal direction. The connecting plate 12 is connected to the end of each shutter blade 11 in the longitudinal direction. The connecting plate 12 is provided so as to be movable up and down in the vertical direction. Note that the number of connecting plates 12 provided in the shutter 1 is not limited to one. Further, the shape of the connecting plate 12 is not limited to that having an L-shaped cross-sectional shape, and may be a simple flat plate.

  On the back surface of the shutter blade 11, as shown in FIG. 3, there is provided a frame flange 14 that is a first flange connected perpendicularly to the back surface of the end portion in the longitudinal direction of the shutter blade 11. The frame flange 14 is provided at both ends of the shutter blade 11 in the longitudinal direction. The frame flange 14 is connected to the shutter frame 10 by a frame connecting portion 16 that connects the shutter blade 11 and the shutter frame 10. Specifically, the frame flange 14 is connected to two pillar portions 18 that constitute the shutter frame 10 and extend in the vertical direction. The two column portions 18 are both side plates of the shutter frame 10 in the left-right direction. The left-right direction of the shutter frame 10 is the Y direction in FIG.

  The shutter blade 11 is rotatably connected to the column portion 18. The frame connecting portion 16 is a support shaft for the shutter blade 11 and a fulcrum for the rotational operation of the shutter blade 11. That is, the shutter blade 11 is supported so as to freely rotate with respect to the frame connecting portion 16 with the frame connecting portion 16 as a fulcrum. The column portion 18 supports the load of the shutter blade 11 at the frame connecting portion 16. In one example, the frame connecting portion 16 includes a pin that passes through the blade flange 15.

  Further, as shown in FIG. 3, a blade flange 15, which is a second flange connected perpendicularly to the rear surface of the end portion in the longitudinal direction of the shutter blade 11, is provided on the rear surface of the shutter blade 11. The blade flange 15 is connected to the connecting plate 12 by a connecting plate connecting portion 17 that connects the shutter blade 11 and the connecting plate 12. The blade flange 15 is connected to the connecting plate connecting portion 17 so as to be rotatable with respect to the connecting plate connecting portion 17, and is rotatable with respect to the connecting plate 12. The blade flanges 15 of the plurality of shutter blades 11 are connected to the connecting plate 12 by connecting plate connecting portions 17.

  When a plurality of connecting plates 12 are arranged, the blade flange 15 is provided at a position in the longitudinal direction of the shutter blade 11 that matches the position where the connecting plate 12 is arranged. In the shutter 1, a blade flange 15 is provided at the end of the shutter blade 11 on the right side in the longitudinal direction when viewed from the front side.

  Next, a connection structure between the shutter blade 11 and the connection plate 12 will be described. FIG. 5 is a cross-sectional view showing the connecting plate connecting portion 17 according to the first embodiment of the present invention, and is a cross-sectional view taken along the line V-V in FIG. 4. The connecting plate connecting portion 17 includes a metal pin 31 and a resin bush 32 that are connecting parts that connect the connecting plate 12 and the shutter blade 11. The connecting plate 12 has an L shape in which a first flat plate portion 12a that is one flat plate portion in the L shape and a second flat plate portion 12b that is the other flat plate portion in the L shape are connected at a right angle. In FIG. 5, the 1st flat plate part 12a bent from the 2nd flat plate part 12b is extended in the near side of the paper surface.

  The metal pin 31 is a metal convex part having a columnar shape provided so as to protrude vertically from the surface facing either of the blade flange 15 and the connecting plate 12 toward the other. In the first embodiment, the metal pin 31 has a cylindrical shape that is provided so as to protrude from the first flat plate portion 12a of the connecting plate 12 in the vertical direction in the direction opposite to the bending direction of the second flat plate portion 12b. It is a metal convex part. Therefore, the surface of the connecting plate 12 facing the blade flange 15 is the one surface 12ab facing the blade flange 15 of the first flat plate portion 12a of the connecting plate 12. The columnar shape is not limited to a solid structure.

  The resin bush 32 is a resin bush having a cylindrical shape that is fitted on the outer peripheral surface of the metal pin 31 coaxially with the metal pin 31. The resin bush 32 is installed on the outer peripheral surface of the metal pin 31 with the same thickness along the outer peripheral surface of the metal pin 31. That is, the resin bush 32 is a resin layer disposed on the outer peripheral surface of the metal pin 31 with the same thickness. The axial direction with the resin bush 32 is the same as the axial direction of the metal pin 31.

  The blade flange 15 and the connecting plate 12 are arranged to face each other in a state where the in-plane direction of the blade flange 15 and the in-plane direction of the first flat plate portion 12a of the connecting plate 12 are parallel. The blade flange 15 is provided with a bush insertion hole 15a which is a circular insertion hole through which the metal pin 31 and the resin bush 32 are inserted. The inner wall of the bush insertion hole 15 a is folded back in a direction perpendicular to the in-plane direction of the blade flange 15. The inner peripheral surface of the bush insertion hole 15 a is a surface along the axial direction with the resin bush 32, and is a surface perpendicular to the in-plane direction of the blade flange 15.

  Then, by inserting the metal pin 31 and the resin bush 32 into the bush insertion hole 15a, the connecting plate 12 and the blade flange 15 of the shutter blade 11 are connected via the metal pin 31 and the resin bush 32. . The inner peripheral surface of the bush insertion hole 15a and the outer peripheral surface of the resin bush 32 are slidable. Further, a flat bush nut 33 is press-fitted and fixed to the metal pin 31 from the free end side of the metal pin 31 on the free end side of the metal pin 31, and the resin bush 32 falls off the metal pin 31. It is preventing.

  The axial direction of the resin bush 32 is perpendicular to the in-plane direction of the blade flange 15. From the shutter blade 11, stress is applied to the metal pin 31 and the resin bush 32 in a direction perpendicular to the axial direction of the resin bush 32. The metal pin 31 has rigidity that does not deform with respect to the stress applied to the metal pin 31. That is, the metal pin 31 has a rigidity that does not deform with respect to the stress applied from the shutter blade 11. Thereby, the metal pin 31 and the resin bush 32 are prevented from being inclined with respect to the axial direction of the resin bush 32 due to the stress applied from the shutter blade 11, and the stress applied from the shutter blade 11 is applied to the resin bush 32. It does not work as a shear stress in a direction inclined with respect to the axial direction.

  In this case, the contact between the inner peripheral surface of the bush insertion hole 15a of the blade flange 15 and the outer peripheral surface of the resin bush 32 is a surface contact. That is, the resin bush 32 can receive the stress applied from the shutter blade 11 by the surface. Therefore, excessive stress is not applied to a specific portion of the resin bush 32 due to the contact between the blade flange 15 and the resin bush 32 being point contact at the corner of the bush insertion hole 15a. For this reason, in the shutter 1, it is possible to prevent wear deterioration of the resin bush 32 due to excessive stress being applied to a specific portion of the resin bush 32, and to prevent the life of the resin bush 32 from being shortened. The life of the resin bush 32 can be extended.

  Further, in the shutter 1, since the contact between the blade flange 15 and the resin bush 32 is a surface contact, rattling between the blade flange 15 and the resin bush 32 can be reduced. It is possible to suppress the occurrence of abnormal noise and abnormal vibration when the shutter blade 1 is opened and closed as compared with the case where the contact is a point contact.

  Even when the metal pin 31 cannot completely prevent deformation due to the load of the shutter blade 11, compared with the case where the connecting component that connects the connecting plate 12 and the shutter blade 11 is made of only resin, Deformation of the connected parts due to the applied stress can be suppressed. Thereby, compared with the case where the connecting component that connects the connecting plate 12 and the shutter blade 11 is made of only the resin, the shutter 1 has an excessive stress applied to a specific portion of the resin bush 32, thereby causing the shutter 1 Since the deterioration of wear can be suppressed and the life of the resin bush 32 can be suppressed from being shortened, the life of the resin bush 32 can be extended.

  The stress applied from the shutter blade 11 to the metal pin 31 and the resin bush 32 is caused by a part of the load of the shutter blade 11 and the air flow from the ventilation fan body 2 hitting the one end portion 11 a of the shutter blade 11. The stress which urges | biases the part 11a below is contained.

  6A and 6B are side views showing a configuration example of the metal pin 31 according to the first embodiment of the present invention, in which FIG. 6A shows the first metal component 131 that constitutes the metal pin 31, and FIG. 6B shows the metal pin. FIG. 3 is a view showing a second metal part 132 constituting 31. When attaching the metal pin 31 to the first flat plate portion 12a of the connecting plate 12, the one end portion 132c of the second metal component 132 is inserted from one side into the insertion hole 12aa provided in the first flat plate portion 12a of the connecting plate 12. . The first metal component 131 protrudes from the flat portion 131b with the first flat plate portion 12a of the connecting plate 12 sandwiched between the flat portion 131b of the first metal component 131 and the flange 132b of the second metal component 132. The convex portion 131a provided by pressing is pressed into the concave portion 132a provided at the one end portion 132c of the second metal part 132 from the other side. As a result, the metal pin 31 can be configured by attaching the metal pin 31 to the first flat plate portion 12 a of the connecting plate 12.

  Also, one end 132c of the second metal part 132 is formed to be long in the axial direction of the metal pin 31, and after passing through the insertion hole 12aa of the first flat plate 12a of the connecting plate 12, the tip of the one end 132c is crushed. The metal pin 31 may be formed by caulking.

  Next, the opening / closing operation of the shutter 1 will be described. When the ventilation fan body 2 starts operation, one end portion 11a of the shutter blade 11 receives wind pressure due to the air flow generated by the ventilation fan body 2, rotates around the frame connecting portion 16 and moves to the outdoor side. Further, the other end portion 11b of the shutter blade 11 rotates with the connecting plate connecting portion 17 as a fulcrum and moves to the indoor side.

  In addition, when the shutter blade 11 closes the opening 13, the blade flange 15 is located on the connecting plate 12 by the metal pin 31 and the resin bush 32 at a position on the upper edge side of the shutter blade 11 relative to the position of the frame connecting portion 16. It is connected. Then, the connecting plate 12 moves downward as the shutter blade 11 rotates. At this time, the inner peripheral surface of the bush insertion hole 15a of the blade flange 15 and the outer peripheral surface of the resin bush 32 slide. Further, the other shutter blade 11 connected to the connecting plate 12 rotates in a direction to open the opening 13 in conjunction with it. Thereby, the opening operation of all the shutter blades 11 is performed synchronously. As described above, with the operation of the ventilation fan body 2, the shutter 1 is opened.

  On the other hand, when the ventilation fan body 2 stops operation, the wind pressure received by the one end portion 11a of the shutter blade 11 disappears. For this reason, the shutter blade 11 rotates in the direction of closing the opening 13 with the frame connecting portion 16 as a fulcrum by its own weight. That is, the shutter blade 11 rotates in the reverse direction to the opening operation described above. The connecting plate 12 moves upward as the shutter blade 11 rotates. At this time, the inner peripheral surface of the bush insertion hole 15a of the blade flange 15 and the outer peripheral surface of the resin bush 32 slide. Then, the other shutter blades 11 connected to the connecting plate 12 rotate in a direction that closes the opening 13 in conjunction with each other. As described above, as the operation of the ventilation fan body 2 is stopped, the shutter 1 is closed. Therefore, the connecting plate 12 is connected to the plurality of shutter blades 11 and moves in conjunction with the rotation operation of the plurality of shutter blades 11 to simultaneously perform the rotation operation, that is, the opening / closing operation of the plurality of shutter blades 11.

  As described above, in the shutter 1 according to the first embodiment, the blade flange 15 of the shutter blade 11 and the connecting plate 12 are connected via the metal pin 31 and the resin bush 32, whereby the blade flange 15 is connected. The contact with the resin bush 32 is a surface contact. For this reason, in the shutter 1, it is possible to prevent or suppress wear deterioration of the resin bush 32 due to excessive stress being applied to a specific portion of the resin bush 32, and to prevent the life of the resin bush 32 from being shortened. Or since it can suppress, the lifetime of the resin bush 32 becomes possible. Further, in the shutter 1, rattling between the blade flange 15 and the resin bush 32 can be reduced, and an abnormality occurs when the shutter blade 1 opens and closes compared to a case where the contact between the blade flange 15 and the resin bush 32 is a point contact. Generation of sound and abnormal vibration can be suppressed.

  Therefore, according to the shutter 1 according to the first embodiment, abnormal noise, abnormal vibration, and shortening of the life of the connecting parts of the connecting plate 12 due to the mounting structure of the connecting plate 12 connecting the plurality of shutter blades 11 are reduced. Can be suppressed.

Embodiment 2. FIG.
FIG. 7 is a cross-sectional view showing a connection structure between the shutter blade 11 and the connection plate 12 in the shutter according to the second embodiment of the present invention, and corresponds to FIG. In FIG. 7, portions corresponding to the shutter 1 according to the first embodiment are denoted by the same reference numerals. In FIG. 7, the first flat plate portion 12a bent from the second flat plate portion 12b extends to the front side of the paper surface as in the case of the first embodiment.

  The shutter according to the second embodiment is that the blade flange 15 is connected to the connecting plate 12 by a connecting plate connecting portion 17a that connects the shutter blade 11 and the connecting plate 12 to each other. And different. The connecting plate connecting portion 17 a includes a metal pin 31 a and a resin bush 32 a that are connecting parts that connect the connecting plate 12 and the shutter blade 11.

  The connecting plate connecting portion 17 a is different from the connecting plate connecting portion 17 in that it is provided on the blade flange 15. That is, the metal pin 31a is a metal convex part having a columnar shape provided so as to protrude vertically from the surface facing one of the blade flange 15 and the connecting plate 12 toward the other. In the second embodiment, the metal pin 31a is a metal convex part having a columnar shape provided to protrude from the blade flange 15 in the vertical direction toward the direction opposite to the bending direction of the second flat plate portion 12b. is there. Therefore, the surface of the blade flange 15 that faces the connecting plate 12 is one surface 15aa that faces the first flat plate portion 12a of the connecting plate 12 of the blade flange 15.

  The resin bush 32a is a resin bush having a cylindrical shape that is fitted on the outer peripheral surface of the metal pin 31a coaxially with the metal pin 31a. The resin bush 32a is installed on the outer peripheral surface of the metal pin 31 with the same thickness along the outer peripheral surface of the metal pin 31a. That is, the resin bush 32a is a resin layer disposed with the same thickness on the outer peripheral surface of the metal pin 31a. The axial direction with the resin bush 32a is the same as the axial direction of the metal pin 31a.

  As in the case of the first embodiment, the blade flange 15 and the connecting plate 12 are in a state where the in-plane direction of the blade flange 15 and the in-plane direction of the first flat plate portion 12a of the connecting plate 12 are parallel to each other. Has been placed. The first flat plate portion 12a of the connecting plate 12 is provided with an insertion hole 12aa that is a circular insertion hole through which the metal pin 31a and the resin bush 32a are inserted. The inner wall of the insertion hole 12aa is folded back in a direction perpendicular to the in-plane direction of the first flat plate portion 12a. The inner peripheral surface of the insertion hole 12aa is a surface along the axial direction of the resin bush 32a, and is a surface perpendicular to the in-plane direction of the insertion hole 12aa.

  The metal pin 31a and the resin bush 32a are inserted into the insertion hole 12aa of the first flat plate portion 12a of the connection plate 12, so that the connection plate 12 and the blade flange 15 of the shutter blade 11 are connected to the metal pin 31a and the resin. It is connected via the bush 32a. The inner peripheral surface of the insertion hole 12aa and the outer peripheral surface of the resin bush 32a are slidable.

  When the shutter blade 11 and the connecting plate 12 are connected by the above structure, the contact between the inner peripheral surface of the insertion hole 12aa of the connecting plate 12 and the outer peripheral surface of the resin bush 32a is a surface contact. In this case, the resin bush 32a can receive the stress applied from the connecting plate 12, that is, the load of the connecting plate 12 on the surface. Therefore, in the shutter according to the second embodiment, the contact between the connecting plate 12 and the resin bush 32a becomes a point contact at the corner of the insertion hole 12aa, which is excessive in a specific portion of the resin bush 32a. No stress is applied. For this reason, in the shutter according to the second embodiment, it is possible to prevent or suppress the deterioration of wear of the resin bush 32a due to excessive stress being applied to a specific portion of the resin bush 32a, and the life of the resin bush 32a is shortened. Since shortening can be prevented or suppressed, the life of the resin bush 32a can be extended.

  Further, in the shutter according to the second embodiment, since the contact between the connecting plate 12 and the resin bush 32a is a surface contact, rattling between the connecting plate 12 and the resin bush 32a can be reduced. The occurrence of abnormal noise and vibration when the shutter blade 1 opens and closes can be suppressed as compared with the case where the contact between the resin bush 32a and the resin bush 32a is a point contact.

  The connecting structure of the shutter blade 11 and the connecting plate 12 in the shutter according to the second embodiment as described above is used when a plurality of shutter blades 11 are connected by one connecting plate 12 in a large shutter, for example. It is preferable. In this case, since the connecting plate 12 becomes larger and the weight of the connecting plate 12 increases, the above effect is effective.

  Therefore, according to the shutter according to the second embodiment, abnormal noise, abnormal vibration, and shortening of the life of the connecting parts of the connecting plate 12 due to the mounting structure of the connecting plate 12 connecting the plurality of shutter blades 11 are suppressed. it can.

Embodiment 3 FIG.
FIG. 8 is a side view showing the connecting component according to the third embodiment of the present invention. The resin bush 32 described above is formed separately from the metal pin 31 by, for example, resin injection molding using a dedicated mold. On the other hand, the resin bush 32 and the metal pin 31 may be integrally molded by pouring resin directly around the metal pin 31. That is, the resin bush 32 and the metal pin 31 may be integrally formed by so-called integral molding.

  The metal pin 31 attached to the shutter according to the third embodiment is an integrally molded product in which the resin bush 32 is integrally formed. In this case, there is no need to attach the resin bush 32 to the metal pin 31, and the process of forming the resin bush 32 and the process of attaching the resin bush 32 to the metal pin 31 can be performed in one step with an integral molding machine. Thereby, compared with the case where the resin bush 32 and the metal pin 31 are formed separately, the manufacturing cost of the shutter according to the third embodiment can be reduced by simplifying the process.

  In this case, the metal pin 31 is used as a part of a mold for making the resin bush 32. In addition to the metal pin 31, a mold for integrally molding the resin bush 32 and the metal pin 31 is required. However, there is no particular limitation on the integral molding of the resin bush 32 and the metal pin 31, and other methods may be used.

  The shutter according to the third embodiment has the same effect as the shutter according to the first embodiment described above.

Embodiment 4 FIG.
The shutter according to the fourth embodiment is a shutter in which the configuration of the third embodiment is applied to the shutter of the second embodiment. The resin bush 32a according to the second embodiment described above is formed separately from the metal pin 31a by, for example, resin injection molding using a dedicated mold. Therefore, as in the case of the third embodiment, the resin bush 32a and the metal pin 31a may be integrally molded by pouring resin directly around the metal pin 31a. That is, the resin bush 32a and the metal pin 31a may be integrally formed by so-called integral molding. In this case, the metal pin 31a attached to the shutter according to the fourth embodiment is an integrally molded product in which the resin bush 32a is integrally formed.

  The shutter according to the fourth embodiment has the same effect as the shutter according to the second embodiment described above.

  The configuration shown in the above embodiment shows an example of the contents of the present invention, and the technologies of the embodiment may be combined with each other, and may be combined with another known technology. It is possible to omit or change part of the configuration without departing from the gist of the invention.

  DESCRIPTION OF SYMBOLS 1 Shutter, 2 Ventilation fan main body, 10 Shutter frame, 11 Shutter blade, 11a One end part, 11b Other end part, 12 Connecting plate, 12a 1st flat plate part, 12aa Insertion hole, 12ab One side, 12b 2nd flat plate part, 13 14 frame flange, 15 blade flange, 15a bush insertion hole, 15aa one face, 16 frame connecting part, 17, 17a connecting plate connecting part, 18 column part, 19 shutter flange, 21 fan, 22 ventilation fan frame, 23 blade, 24 fan motor , 25 Wind tunnel part, 26 Support leg, 31, 31a Metal pin, 32, 32a Resin bush, 33 Flat bush nut, 131 First metal part, 131a Convex part, 131b Flat part, 132 Second metal part, 132a Concave part, 132b Flange, 132 c One end.

Claims (4)

A shutter frame provided with an opening through which airflow generated in the ventilation fan body passes;
A plurality of shutter blades that are freely supported to rotate about support shafts provided on both side plates of the shutter frame in the left-right direction, and that open and close the opening of the shutter frame;
A connecting plate that is connected to the plurality of shutter blades and that simultaneously performs the rotating operation of the plurality of shutter blades;
With
The shutter blade has a blade flange connected to the connecting plate,
The blade flange and the connecting plate are arranged to face each other in a state where an in-plane direction of the blade flange and an in-plane direction of the connecting plate are parallel,
A metal convex part provided so as to protrude vertically from the surface facing one of the blade flange and the connecting plate to the other, and a resin layer disposed on the outer peripheral surface of the convex part , The connecting component is connected to the shutter blade and the connecting plate by being inserted through an insertion hole provided on the surface of the other facing the one.
A shutter for ventilation fans. The one is the connecting plate;
The other is the blade flange;
The shutter for a ventilation fan according to claim 1. The one is the blade flange;
The other is the connecting plate;
The shutter for a ventilation fan according to claim 1. The connecting component is an integrally molded product in which the convex component and the resin layer are integrally molded;
The shutter for a ventilation fan according to any one of claims 1 to 3, wherein: