Electric shutters and ventilation fans

Abstract

To provide an electric shutter which can prevent reduction of holding power used to hold shutter blades in a fully open state, and to provide an air fan.SOLUTION: An electric shutter includes: connection plates 6 disposed at an opening of a shutter frame 3; a shutter blade opening / closing drive part 9 which causes the connection plates 6 to reciprocate between a first position and a second position in the opening and stops reciprocating motion to hold the connection plates 6 at the second position; shutter blades 2 each of which has first slide parts 40 each of which is connected so as to be rotatable relative to the shutter frame 3 as a rotation center, and second slide parts 41 each of which is located at the connection plate 6 side relative to the first slide part 40 and connected so as to be rotatable relative to the connection plate 6, the shutter blade 2 configured to bring the opening into a fully closed state when each connection plate 6 is in the first position and bring the opening into a fully open state when each connection plate 6 is in the second position; and pressing parts 6b each of which presses, at the second position, a base 2c of the shutter blade 2 in a direction from the first position to the second position.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present disclosure relates to an electric shutter and a ventilation fan for exchanging air between indoors and outdoors.

Background Art

[0002] Patent Document 1 discloses a ventilation electric shutter opening / closing mechanism in which shutter blades close so as not to malfunction when receiving a strong external force such as strong wind.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a strong external force such as strong wind is applied to the shutter blades in the fully open state, the magnet attached in conjunction with the shutter blades detaches from the magnet receiving fitting attached to the movable part of the shutter opening / closing motor in the ventilation electric shutter opening / closing mechanism disclosed in Patent Document 1, closing the shutter blades. However, when the ventilation electric shutter opening / closing mechanism disclosed in Patent Document 1 is arranged in livestock houses such as cowsheds and chicken coops, rust occurs on the magnet and the magnet receiving fitting due to ammonia generated from cow and chicken manure and chlorine generated from chlorine disinfection in cowsheds and chicken coops, resulting in a decrease in the adsorption force between the magnet and the magnet receiving fitting. The decrease in the adsorption force between the magnet and the magnet receiving fitting leads to a decrease in the holding force for keeping the shutter blades in the fully open state. Therefore, there was a problem that the fully open state of the shutter blades could not be stably maintained.

[0005] This disclosure aims to solve the above-mentioned problems and to provide an electric shutter and ventilation fan that can prevent a decrease in holding force when holding the shutter blade in a fully open position. [Means for solving the problem]

[0006] The electric shutter according to this disclosure includes a connecting plate positioned in an opening of the shutter frame, a shutter blade opening / closing drive unit that moves the connecting plate back and forth between a first position and a second position in the opening, and stops and fixes the reciprocating movement at the second position, a shutter blade having a first sliding part rotatably connected to the shutter frame as a center of rotation, and a second sliding part located on the connecting plate side of the first sliding part and rotatably connected to the connecting plate, such that the opening is fully closed when the connecting plate is in the first position and fully open when the connecting plate is in the second position, and a pressing part that presses the shutter blade in the direction from the first position to the second position at the second position. The portion of the shutter blade pressed by the pressing part is such that when the connecting plate is in the second position, it is in the axial direction of rotation of the first sliding part and the second sliding part and , connecting plate From the first position to the second position Move It is positioned between the position of the first sliding part and the position of the second sliding part with respect to a direction perpendicular to the direction.

[0007] Furthermore, the ventilation fan described herein is equipped with this electric shutter to perform ventilation. [Effects of the Invention]

[0008] According to this disclosure, it is possible to obtain an electric shutter and a ventilation fan that can prevent a decrease in holding force when holding the shutter blade in a fully open position. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing an overview of an electric shutter according to an embodiment. [Figure 2]This is a front view of the configuration of an electrically operated shutter in the fully closed state of the shutter blade according to the embodiment, as seen from the front. [Figure 3] This is a rear view of the configuration of the electric shutter in the fully open state of the shutter blade according to the embodiment, as seen from the rear side. [Figure 4] This is a component diagram showing the shutter blade of an electric shutter according to an embodiment. [Figure 5] This is a parts diagram showing the connecting plate of an electric shutter according to an embodiment. [Figure 6] This is a detailed view showing the state in which the shutter blade of an electric shutter according to an embodiment is attached to the connecting plate and the left side frame, and is a detailed view showing part D in Figure 3. [Figure 7] This is a detailed diagram showing the assembled state of the shutter blade and connecting plate in an electric shutter according to an embodiment, and is a detailed diagram showing the state when the shutter blade is fully open. [Figure 8] This is a detailed diagram showing the shutter blade opening and closing drive unit in an electric shutter according to an embodiment, and is a detailed view taken from the rear side as shown in Figure 3. [Figure 9] This is an explanatory diagram illustrating the relationship between a crank constituting the shutter blade opening and closing drive unit in an electric shutter according to an embodiment, and a detection switch that stops the rotation of the crank, and is an explanatory diagram viewed from direction E in Figure 8. [Figure 10] This is a cross-sectional view of the fully closed state of the shutter blade of an electric shutter according to an embodiment, and is a cross-sectional view of the electric shutter configuration as seen from direction AA in Figure 2. [Figure 11] This is a cross-sectional view of the fully open state of the shutter blade of an electric shutter according to an embodiment, and is a cross-sectional view of the electric shutter configuration as seen from the BB direction in Figure 3. [Figure 12] This is an explanatory diagram illustrating the opening and closing operation of the shutter blades in an electrically operated shutter according to an embodiment. [Modes for carrying out the invention]

[0010] The embodiments for carrying out the subject matter of this disclosure will be described with reference to the attached figures. In each figure, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations are simplified or omitted as appropriate. However, the subject matter of this disclosure is not limited to the following embodiments, and any modification of any component of the embodiments or omission of any component of the embodiments is possible without departing from the spirit of this disclosure.

[0011] <Configuration of the electric shutter 1> The configuration of the electric shutter 1 according to the embodiment will be described based on Figures 1 to 9. Figure 1 is a perspective view showing an overview of the electric shutter 1 according to the embodiment. Figure 2 is a front view of the configuration of the electric shutter 1 with the shutter blade 2 in the fully closed state, as seen from the front. Figure 3 is a rear view of the configuration of the electric shutter 1 with the shutter blade 2 in the fully open state, as seen from the rear. Figure 4 is a parts diagram showing the shutter blade 2 of the electric shutter 1 according to the embodiment. Figure 5 is a parts diagram showing the connecting plate 6 of the electric shutter 1 according to the embodiment. Figure 6 is a detailed view showing the state in which the shutter blade 2 of the electric shutter 1 according to the embodiment is attached to the connecting plate 6 and the left side frame 3c, and is a detailed view showing part D in Figure 3. Figure 7 is a detailed view showing the assembled state of the shutter blade 2 and connecting plate 6 of the electric shutter 1 according to the embodiment, and is a detailed view showing the case when the shutter blade 2 is in the fully open state. Figure 8 is a detailed view showing the shutter blade opening / closing drive unit 9 of the electric shutter 1 according to the embodiment, and is a detailed view seen from the rear side shown in Figure 3. Figure 9 is an explanatory diagram illustrating the relationship between a crank 13 and a detection switch 14 that stops the rotation of the crank 13, which constitute the shutter blade opening / closing drive unit 9 in the electric shutter 1 according to the embodiment, and is an explanatory diagram viewed from direction E in Figure 8.

[0012] In the following description, the configuration of the electric shutter 1 will be described using the directions of the arrows shown in each figure. This is for the purpose of facilitating the understanding of the configuration of the electric shutter 1 and does not limit the subject of the present disclosure. In the notation of directions in the figures, the right side surface side and the left side surface side are denoted based on the direction of viewing from the front side to the back side as shown in FIGS. 1 and 2. Therefore, in the figure viewed from the back side to the front side as shown in FIG. 3, the right side surface side and the left side surface side are denoted in the opposite direction to FIGS. 1 and 2.

[0013] The electric shutter 1 includes a shutter frame 3, a flange 20, a reinforcing plate 7, shutter blades 2, a connecting plate 6, a first sliding portion 40, a second sliding portion 41, and a shutter blade opening / closing drive portion 9.

[0014] As shown in FIG. 2, the shutter frame 3 is composed of an upper frame 3a, a lower frame 3d, a right side surface frame 3b, and a left side surface frame 3c. The upper frame 3a, the lower frame 3d, the right side surface frame 3b, and the left side surface frame 3c are long plate-like components. The upper frame 3a is provided on the upper surface side in the height direction. The lower frame 3d is provided on the lower surface side in the height direction opposite to the upper frame 3a. The right side surface frame 3b is provided on the right side surface side in the width direction and connects one end on the right side surface side of the upper frame 3a and one end on the right side surface side of the lower frame 3d. The left side surface frame 3c is provided on the left side surface side in the width direction and connects one end on the left side surface side of the upper frame 3a and one end on the left side surface side of the lower frame 3d. The upper frame 3a, the lower frame 3d, the right side surface frame 3b, and the left side surface frame 3c are joined to each other, for example, by an adhesive or welding. Thereby, the shutter frame 3 has a rectangular opening surrounded by the upper frame 3a, the lower frame 3d, the right side surface frame 3b, and the left side surface frame 3c.

[0015] The flange 20 is a member for fixing the shutter frame 3 to the wall 60 of the building. The flange 20 is provided on the back side of the shutter frame 3 in the depth direction. The flange 20 is provided between the shutter frame 3 and the wall 60. As shown in FIG. 3, the flange 20 is composed of an upper frame flange 20a, a lower frame flange 20d, a right side frame flange 20b, and a left side frame flange 20c. The upper frame flange 20a, the lower frame flange 20d, the right side frame flange 20b, and the left side frame flange 20c are long plate-shaped parts.

[0016] The upper frame flange 20a is provided on the upper surface side in the height direction. The lower frame flange 20d is provided on the lower surface side in the height direction opposite to the upper frame flange 20a. The right side frame flange 20b is provided on the right side surface side in the width direction, connecting one end on the right side surface side of the upper frame flange 20a and one end on the right side surface side of the lower frame flange 20d. The left side frame flange 20c is provided on the left side surface side in the width direction, connecting one end on the left side surface side of the upper frame flange 20a and one end on the left side surface side of the lower frame flange 20d. The upper frame flange 20a, the lower frame flange 20d, the right side frame flange 20b, and the left side frame flange 20c are joined to each other, for example, by an adhesive or welding. Thereby, the flange 20 has a rectangular opening surrounded by the upper frame flange 20a, the lower frame flange 20d, the right side frame flange 20b, and the left side frame flange 20c. The rectangular openings of the flange 20 and the shutter frame 3 have substantially the same size in order to smooth the air flow passing through the electric shutter 1.

[0017] As shown in Figure 2, the shutter frame 3 has frame mounting holes 30. Two frame mounting holes 30 are provided in each of the upper frame 3a, lower frame 3d, right side frame 3b, and left side frame 3c, with equal spacing from the center of each frame on both sides. As shown in Figure 3, the flange 20 has flange mounting holes 31. Two flange mounting holes 31 are provided in each of the upper frame flange 20a, lower frame flange 20d, right side frame flange 20b, and left side frame flange 20c, with equal spacing from the center of each flange on both sides. The frame mounting holes 30 and flange mounting holes 31 are located in the same position when viewed from the front or rear side.

[0018] The frame mounting holes 30 and flange mounting holes 31 are used when attaching the electric shutter 1 to the wall 60, as shown in Figures 1 to 3. When the electric shutter 1 is used as an air intake to adjust the airflow, the electric shutter 1 is attached to the wall 60 via the frame mounting holes 30 and flange mounting holes 31 using fasteners such as bolts (not shown). When the electric shutter 1 is used in combination with a ventilation fan 50 provided on the rear side, the electric shutter 1 is attached to the wall 60 via the frame mounting holes 30 and flange mounting holes 31, and the frame of the ventilation fan 50 (not shown), using fasteners such as bolts (not shown).

[0019] The reinforcing plate 7 is a long, plate-shaped component that reinforces the shutter frame 3. The reinforcing plate 7 prevents the shutter frame 3 from bending or deforming. As shown in Figures 1 and 3, the reinforcing plate 7 is provided in the center of the rectangular opening of the shutter frame 3 and connects the upper frame 3a and the lower frame 3d of the shutter frame 3. The reinforcing plate 7 is provided in the height direction parallel to the left side frame 3c and the right side frame 3b. The reinforcing plate 7 is joined to the upper frame 3a and the lower frame 3d. The reinforcing plate 7 has a notch 7a at the position where the shutter blade 2 is installed. The notch 7a is provided to facilitate the work of installing the shutter blade 2. If there is no possibility of bending or deformation of the shutter frame 3, the reinforcing plate 7 may not be necessary.

[0020] As shown in Figure 2, the shutter blade 2 is installed in a rectangular opening enclosed by the upper frame 3a, lower frame 3d, right side frame 3b, and left side frame 3c. The shutter blade 2 is a long component that has a predetermined width in the short direction (height direction in Figure 2) and extends in the longitudinal direction (width direction in Figure 2). The shutter blade 2 has a gap between the right side frame 3b and the left side frame 3c that is small enough not to come into contact with each other. In this embodiment, six shutter blades 2 are shown installed in the height direction. The six shutter blades 2 make the rectangular opening formed by the shutter frame 3 either fully closed or fully open. Note that the number of shutter blades 2 is not limited to six; any number can be set as long as the rectangular opening can be made fully closed or fully open.

[0021] As shown in Figure 4, the shutter blade 2 consists of a tip 2a, a shutter section 2b, a base 2c, a support shaft section 2d, a first bent section 2h, and a second bent section 2i. The shutter blade 2 shown in Figure 4 is in the fully open position (see Figures 1, 3, and 11). The shutter blade 2 consists of two parts: a part with the tip 2a, shutter section 2b, base 2c, fixing section 2e, first bent section 2h, and second bent section 2i formed on it, and a support shaft section 2d. The shutter blade 2 is formed as a single part by joining the base 2c and the support shaft section 2d with a rivet 2g.

[0022] The fixing portion 2e is provided on the lower side of the base portion 2c. The fixing portion 2e engages with the support shaft portion 2d when joining the base portion 2c to the support shaft portion 2d, thereby fixing the base portion 2c to the support shaft portion 2d. The tip portion 2a, shutter portion 2b, base portion 2c, first bent portion 2h, and second bent portion 2i are formed by bending a long, flat plate component extending in the longitudinal direction (width direction in Figure 2) into a trapezoidal shape in cross-sectional view, as shown in Figure 4. In detail, the shutter portion 2b is formed extending from the front end of the support shaft portion 2d, with the base portion 2c as the reference plane, and is bent with an inclination of approximately 30° in the direction of the lower surface. The tip portion 2a is formed extending from the end of the shutter portion 2b on the opposite side of the base portion 2c. The front portion 2a is bent at an angle of approximately 45° from the end of the shutter portion 2b toward the downward side, with the shutter portion 2b as the reference plane. The second bent portion 2i is formed by bending the front portion 2a, located on the opposite side of the shutter portion 2b, by 180°. The first bent portion 2h is formed by bending the base portion 2c, located on the opposite side of the shutter portion 2b, toward the upward side and bending its end by 180°. The first bent portion 2h and the second bent portion 2i are provided to increase the strength of the shutter blade 2.

[0023] As shown in Figures 1, 3, and 6, the support shaft portion 2d has a U-shape when viewed from the depth direction, with an opening on the lower side. As shown in Figure 4, the support shaft portion 2d has a first sliding hole 2j and a second sliding hole 2k on the U-shaped side surface. The first sliding hole 2j and the second sliding hole 2k are formed on both sides of the U-shape. The support shaft portion 2d is provided in a position where it can be connected to the right side frame 3b and the left side frame 3c of the shutter frame 3. The support shaft portion 2d is provided in a position where it can be connected to the connecting plate 6. In this embodiment, as shown in Figure 3, the shutter blade 2 has three support shaft portions 2d corresponding to the three connecting plates 6.

[0024] As shown in Figure 5, the connecting plate 6 is a long component that extends in the vertical direction, which is its longitudinal direction. When cut in the width direction, the connecting plate 6 has an L-shaped cross-section. The connecting plate 6 is bent at approximately 90° in the width direction from the end on the back side (see Figures 3 and 5). The connecting plate 6 has a connecting portion 6a in the depth direction. The connecting portion 6a has a third sliding hole 6c for connecting the shutter blade 2. The connecting plate 6 has a pressing portion 6b that protrudes from the connecting portion 6a towards the front side in the depth direction. The pressing portion 6b has a notch 6d that opens toward the lower side on the back side. There are six pressing portions 6b, notches 6d and third sliding holes 6c, the same number as the shutter blade 2. The shutter blades 2 are mounted at the same intervals in the height direction. Therefore, the pressing portions 6b, notches 6d and third sliding holes 6c are also formed at the same intervals. The connecting plate 6 has mounting holes (not shown) on its widthwise surface perpendicular to the depth direction for connecting to the horizontal plate 8 and the shutter blade opening / closing drive unit 9.

[0025] As shown in Figures 1 and 3, three connecting plates 6 are provided at equal intervals in the width direction. One of the three connecting plates 6 is located approximately in the center of the shutter frame 3. Another of the three connecting plates 6 is located near the left side frame 3c. The remaining connecting plate 6 is located near the right side frame 3b.

[0026] As shown in Figure 3, the three connecting plates 6 are joined to each other by long horizontal plates 8 that extend in the width direction, which is the longitudinal direction. In this embodiment, the horizontal plates 8 are provided at two locations, on the upper and lower sides in the height direction, with the center as the dividing line. The horizontal plates 8 are connected to the connecting plates 6 by fasteners such as mounting screws. The horizontal plates 8 are provided to interlock the three connecting plates 6. The horizontal plates 8 are used as reinforcement when interlocking the three connecting plates 6. The number of connecting plates 6 and the number of horizontal plates 8 are not particularly limited and can be set arbitrarily.

[0027] As shown in Figures 4, 6, and 7, the first sliding part 40 is connected to mounting holes (not shown) on the right side frame 3b and left side frame 3c of the shutter frame 3 by inserting the first sliding pin 11 through the first sliding hole 2j of the support shaft portion 2d of the shutter blade 2. Figure 6 shows, as an example, the state in which the first sliding pin 11 is inserted through the first sliding hole 2j of the support shaft portion 2d and connected to the left side frame 3c of the shutter frame 3. A similar configuration is also provided on the right side frame 3b of the shutter frame 3 (see Figure 3). Since the first sliding part 40 is connected to the right side frame 3b and left side frame 3c, its position in space does not change and is fixed. Therefore, the first sliding part 40 functions as the center of rotation when the shutter blade 2 is rotated. That is, the shutter blade 2 is rotatably connected to the shutter frame 3.

[0028] As shown in Figures 4 to 7, the second sliding part 41 is formed by inserting a second sliding pin 12 through the second sliding hole 2k of the support shaft portion 2d of the shutter blade 2 and the third sliding hole 6c of the connecting plate 6. The second sliding part 41 enables sliding between the shutter blade 2 and the connecting plate 6. The second sliding part 41 is located at a distance from the first sliding part 40. Specifically, the second sliding part 41 is positioned closer to the connecting plate 6 than the first sliding part 40. As a result, the second sliding part 41, with the first sliding part 40 as its pivot point, converts the linear movement of the connecting plate 6 in the height direction into rotational movement of the shutter blade 2, thereby enabling the opening and closing of the shutter blade 2 relative to the opening of the shutter frame 3.

[0029] Figure 7 shows an example where the connecting plate 6 and the shutter blade 2 are assembled and the shutter blade 2 is in the fully open position. When the shutter blade 2 is in this fully open position, the pressing portion 6b of the connecting plate 6 presses the base portion 2c of the shutter blade 2, specifically the base portion 2c located between the first sliding portion 40 and the second sliding portion 41, toward the downward side in the height direction, as shown by arrow W in Figure 9.

[0030] As shown in Figures 8 and 9, the shutter blade opening / closing drive unit 9 comprises a motor 10, a power line 10a, a crank 13, a crank arm 15, a connecting arm 16, a connecting plate 17, and a detection switch 14. The motor 10 is a gear motor. The motor 10 receives a drive voltage from the power line 10a. Inside the motor 10, there is a crank 13 connected to the rotating shaft of the gear motor, which transmits rotational force to the crank arm 15, and a detection switch 14 which acts as a position detection unit to stop the rotation of the crank 13. The crank 13 stops and fixes the operation of the shutter blade opening / closing drive unit 9 by contacting the detection switch 14. Specifically, the crank 13 stops the rotation of the gear motor by contacting the detection switch 14 and is fixed in that position. In this embodiment, the detection switch 14 is adjusted so that the rotation of the gear motor stops when the shutter blade 2 is fully open.

[0031] The crank arm 15 is a rectangular plate-shaped member. One end of the crank arm 15 in the longitudinal direction is fixed to the crank 13 by a crank arm fixing screw 13a. The connecting arm 16 is a long component extending in the longitudinal direction. The other end of the crank arm 15 is connected to one end of the connecting arm 16 by a third sliding pin 18 that allows sliding between the crank arm 15 and the connecting arm 16. The other end of the connecting arm 16 is connected to one end of an L-shaped connecting plate 17 by a fourth sliding pin 19 that allows sliding between the connecting arm 16 and the connecting plate 17. The other end of the connecting plate 17 is fixed to the connecting plate 6 by a connecting plate fixing screw 17a. The shutter blade opening / closing drive unit 9 converts the rotation of the motor 10 into linear movement of the connecting plate 6 in the height direction.

[0032] <Operation of the electric shutter 1> Next, the operation of the electric shutter 1 according to the embodiment will be described, mainly with reference to Figures 10 to 12. Figure 10 is a cross-sectional view of the shutter blade 2 of the electric shutter 1 according to the embodiment in the fully closed state, and is a cross-sectional view of the electric shutter 1 seen from direction AA in Figure 2. Figure 11 is a cross-sectional view of the shutter blade 2 of the electric shutter 1 according to the embodiment in the fully open state, and is a cross-sectional view of the electric shutter 1 seen from direction BB in Figure 3. Figure 12 is an explanatory diagram illustrating the opening and closing operation of the shutter blade 2 in the electric shutter 1 according to the embodiment. In Figure 12, (A) shows the shutter blade 2 in the fully closed state, (B) shows the state in between the shutter blade 2 moving from the fully closed state to the fully open state, and (C) shows the shutter blade 2 in the fully open state.

[0033] First, when the shutter blade 2 is fully closed, the other end of the crank arm 15 of the shutter blade opening / closing drive unit 9 is at the highest position in the height direction (hereinafter referred to as the top dead center), as shown in Figure 10. At this top dead center, the connecting plate 6 connected to the crank arm 15 and the second sliding part 41 connected to the shutter blade 2 between the connecting plate 6 are pushed up to the highest position on the upper side in the height direction (referred to as the first position), as shown in Figure 12(A). At the first position, the shutter blade 2 on the opposite side of the second sliding part 41, with the first sliding part 40 as the center of rotation, is pushed down to the lower side in the height direction, and as shown in Figure 12(A), it is in the fully closed position.

[0034] Next, a drive voltage is applied to the motor 10 of the shutter blade opening / closing drive unit 9 from the power line 10a. The crank 13 and crank arm 15 connected to the gear motor of the motor 10 rotate in the direction shown by M1 in Figure 10. As the crank 13 and crank arm 15 rotate, the other end of the crank arm 15 moves downward from the highest position in the height direction. As the other end of the crank arm 15 moves downward, the connecting plate 6 connected to the crank arm 15 and the second sliding part 41 connected to the shutter blade 2 between the connecting plate 6 move to the lower side in the height direction, as shown by M2 in Figure 12(B). Then, as the second sliding part 41 moves to the lower side in the height direction, the shutter blade 2 on the opposite side of the second sliding part 41, with the first sliding part 40 as the center of rotation, is pushed up to the upper side in the height direction, as shown by M3 in Figure 12(B), and gradually opens.

[0035] As the crank 13 and crank arm 15 rotate, the other end of the crank arm 15 of the shutter blade opening / closing drive unit 9 reaches its lowest position in the height direction (hereinafter referred to as the bottom dead center), as shown in Figure 11. At this bottom dead center, the connecting plate 6 connected to the crank arm 15 and the second sliding part 41 connected to the shutter blade 2 between the connecting plate 6 are pushed down to the lowest position on the lower side in the height direction (referred to as the second position), as shown in Figure 12(C). In the second position, the shutter blade 2 on the opposite side of the second sliding part 41, with the first sliding part 40 as the center of rotation, is pushed up to the upper side in the height direction, and becomes fully open, as shown in Figure 12(C).

[0036] Furthermore, at the bottom dead center, the crank 13 is adjusted to contact the detection switch 14, which acts as a position detection unit. The gear motor of the motor 10 is also set to stop rotating when the crank 13 contacts the detection switch 14, and to maintain that stopped state. This allows the shutter blade 2 to maintain its fully open position.

[0037] In addition, when the shutter blade 2 is fully open, the pressing portion 6b of the connecting plate 6 presses the base portion 2c of the shutter blade 2 toward the lower side in the height direction, as shown by arrow W in Figure 12(C), in order to prevent the shutter blade 2 from closing. Specifically, like a lever with the first sliding portion 40 as the fulcrum, the pressing portion 6b presses the base portion 2c downward in the height direction, causing the shutter blade 2 to receive an upward force in the height direction with the first sliding portion 40 as the fulcrum. Therefore, by maintaining the state in which the pressing portion 6b presses the base portion 2c, the state in which the shutter blade 2 is bounced upward in the height direction is maintained.

[0038] For example, as shown by arrow F in Figure 11, if a strong external force such as a strong wind is applied to the shutter blade 2, the shutter blade 2 will be pushed down towards the lower side in the height direction. Then, in the opposite direction to the direction of the force acting on the shutter blade 2, the connecting plate 6 will be pushed up towards the upper side in the height direction. At this time, simply holding the shutter blade 2 in the fully open position by stopping and fixing the rotation of the gear motor of the motor 10 is not enough, as the flapping of the shutter blade 2 may cause it to close instead of being able to maintain the fully open position. In this embodiment, when the shutter blade 2 is in the fully open position, the pressing part 6b presses the base part 2c, located between the first sliding part 40 and the second sliding part 41 of the shutter blade 2, toward the lower side in the height direction (from the first position to the second position), thereby counteracting the force that tries to close the shutter blade 2, in other words, the force that pulls the connecting plate 6 toward the upper side in the height direction. This makes it possible to stably hold the shutter blade 2 in the fully open position.

[0039] When returning the shutter blade 2 from the fully open state to the fully closed state, the gear motor of the motor 10 is rotated from the bottom dead center to the top dead center. In this way, the shutter blade opening / closing drive unit 9 moves the connecting plate 6 back and forth between a first position and a second position in the height direction, so that the shutter blade 2 is in the fully closed state at the first position of the connecting plate 6 and the fully open state at the second position of the connecting plate 6.

[0040] In the above description, the connecting plate 6 is shown to have a pressing portion 6b, but the pressing portion 6b only needs to be able to press the base portion 2c of the shutter blade 2, and for example, the pressing portion 6b may be configured as a separate component. Also, in the above description of the embodiment, a detection switch 14 that detects the position of the crank 13 is shown as the position detection unit, but it is sufficient to be able to detect the fully open state of the shutter blade 2, and for example, a position sensor that detects the position of the connecting plate 6 may be used.

[0041] <Effects of Electric Shutter 1> In this embodiment, the electric shutter 1 stops the operation of the shutter blade opening / closing drive unit 9 and holds the shutter blade 2 in the fully open position, while the pressing unit 6b presses the base 2c of the shutter blade 2 from the first position, which prevents the shutter blade 2 from closing, to the second front position. This prevents a decrease in holding force when holding the shutter blade 2 in the fully open position.

[0042] Furthermore, the pressing part 6b directly presses the shutter blade 2 to prevent it from moving, thus eliminating any flapping of the shutter blade 2.

[0043] Furthermore, since the pressing portion 6b only needs to be attached to the connecting plate 6, it contributes to cost reduction.

[0044] Furthermore, since magnets are not used to hold the shutter blade 2 in the fully open position, there is no reduction in magnetic attraction due to rust. As a result, the electric shutter 1 can operate stably.

[0045] Furthermore, by attaching the electric shutter 1 of this embodiment to the ventilation fan 50, the ventilation fan 50 can be operated stably.

[0046] The configuration described above in this embodiment is an example of the content of this disclosure. The embodiment can be combined with other known technologies. It is possible to omit or modify parts of the configuration of the embodiment without departing from the spirit of this disclosure.

[0047] Examples of aspects that may be included in this disclosure are listed below as an addendum. (Note 1) A connecting plate is placed in the opening of the shutter frame. A shutter blade opening / closing drive unit that moves the connecting plate back and forth between a first position and a second position within the opening, and stops and fixes the reciprocating movement at the second position. A shutter blade having a first sliding part rotatably connected to the shutter frame as a center of rotation, and a second sliding part located on the connecting plate side of the first sliding part and rotatably connected to the connecting plate, wherein the opening is fully closed when the connecting plate is in the first position and fully open when the connecting plate is in the second position. A pressing portion presses the shutter blade, which is located between the first sliding portion and the second sliding portion, in the direction from the first position to the second position at the second position. An electric shutter equipped with [a specific feature / feature]. (Note 2) The pressing portion is provided on the connecting plate, The electric shutter described in Appendix 1. (Note 3) The shutter blade opening / closing drive unit includes a position detection unit that detects the second position. An electric shutter as described in Appendix 1 or 2. (Note 4) The shutter blade comprises a support shaft portion having the first sliding portion and the second sliding portion, a base portion coupled to the support shaft portion, and a shutter portion extending from the base portion to the opposite side of the connecting plate. The pressing portion presses the base portion, An electric shutter as described in any of the notes 1 to 3. (Note 5) Ventilation is performed using an electric shutter as described in any of the appendices 1 to 4. Ventilation fan. [Explanation of Symbols]

[0048] 1 Electric shutter, 2 Shutter blade, 2a Front part, 2b Shutter part, 2c Base part, 2d Support shaft part, 2e Fixing part, 2g Rivet, 2h First bend part, 2i Second bend part, 2j First sliding hole, 2k Second sliding hole, 3 Shutter frame, 3a Upper frame, 3b Right side frame, 3c Left side frame, 3d Lower frame, 6 Connecting plate, 6a Connecting part, 6b Pressing part, 6c Third sliding hole, 6d Notch part, 7 Reinforcement plate, 7a Notch part, 8 Side plate, 9 Shutter blade opening / closing drive unit, 10 Motor, 10a Power line, 11 First sliding pin, 12 Second sliding pin, 13 Crank, 13a Crank arm fixing screw, 14 Detection switch, 15 Crank arm, 16 Connecting arm, 17 Connecting plate, 17a Connecting plate fixing screw, 18 Third sliding pin, 19 Fourth sliding pin, 20 Flange, 20a Upper frame flange, 20b Right side frame flange, 20c Left side frame flange, 20d Lower frame flange, 30 Frame mounting hole, 31 Flange mounting hole, 40 First sliding part, 41 Second sliding part, 50 Ventilation fan, 60 Wall.

Claims

1. A connecting plate is placed in the opening of the shutter frame. A shutter blade opening / closing drive unit that moves the connecting plate back and forth between a first position and a second position within the opening, and stops and fixes the reciprocating movement at the second position. A shutter blade having a first sliding part rotatably connected to the shutter frame as a pivot point, and a second sliding part located on the connecting plate side of the first sliding part and rotatably connected to the connecting plate, wherein the opening is fully closed when the connecting plate is in the first position and fully open when the connecting plate is in the second position, and In the second position, a pressing part presses the shutter blade in the direction from the first position to the second position. Equipped with, An electrically operated shutter in which the portion of the shutter blade pressed by the pressing portion is positioned between the position of the first sliding portion and the position of the second sliding portion with respect to a direction perpendicular to the axial direction in which the first sliding portion and the second sliding portion rotate and the direction in which the connecting plate moves from the first position to the second position, when the connecting plate is in the second position.

2. The pressing portion is provided on the connecting plate, The electric shutter according to claim 1.

3. The shutter blade opening / closing drive unit includes a position detection unit that detects the second position. The electric shutter according to claim 1.

4. The shutter blade comprises a support shaft portion having the first sliding portion and the second sliding portion, a base portion joined to the support shaft portion, and a shutter portion extending from the base portion to the opposite side of the connecting plate. The pressing portion presses the base portion, The electric shutter according to claim 1.

5. Ventilation is performed using an electric shutter as described in any one of claims 1 to 4. Ventilation fan.

Images