Ventilation fan shutter and ventilation fan

Abstract

To provide a ventilation fan shutter that can reduce noise and prevent damage to a blade.SOLUTION: A ventilation fan shutter 1 comprises: a frame 10 provided with an opening 11 through which an air flow generated by operation of a ventilation fan body 2 is passed; a chain blade 12 for opening and closing the opening 11 by a plurality of rectangular plates 14 connected vertically; rails 13 provided in both side part frames 10c of the frame 10 respectively, and for guiding both ends of the chain blade 12 in a vertical direction; a winding shaft 16 provided in an upper frame 10a of the frame 10, and for winding or unwinding the chain blade 12; and a motor 19 for rotating and driving the winding shaft 16.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a shutter for a ventilator fan and a ventilator fan equipped with the shutter for a ventilator fan. [Background technology]

[0002] Patent Document 1 discloses a shutter for a ventilation fan that opens and closes in conjunction with the operation of the ventilation fan body. This shutter for a ventilation fan includes a frame with an opening through which the airflow generated by the ventilation fan body passes, and a number of blades that are rotatably supported in the opening of the frame and open and close the frame opening. A connecting plate is attached to each blade, and the blades rotate in conjunction with each other via this connecting plate. This rotation causes each blade to open and close the opening of the frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6937709 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the shutter for the ventilator described in Patent Document 1 has blades attached to the openings of the frame, and the air flow passing through the openings hits the blades, generating noise. In particular, when the ventilator main body is operating to draw air from outside the building into the room, the shutter for the ventilator is located upstream of the ventilator main body with respect to the air flow. Therefore, the ventilator main body draws in the turbulent air flow that hits the blades, generating significant noise.

[0005] Furthermore, because the blades are positioned in an air duct that is directly connected to the outside of the building, they are easily affected by external winds, and if a strong wind such as a typhoon blows, there is a risk that the blades will be damaged by the great wind pressure.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a shutter for a ventilation fan that can reduce noise and prevent damage to the blades, and a ventilation fan equipped with this ventilation fan shutter. [Means for solving the problem]

[0007] The shutter for a ventilation fan according to the present disclosure comprises a frame having an opening through which airflow generated by operation of the ventilation fan body passes, a chain blade which opens and closes the opening by a number of rectangular plates connected vertically, rails provided on both side frames of the frame for guiding both ends of the chain blade in the vertical direction, a winding shaft provided on the upper frame of the frame for winding or unwinding the chain blade, and a motor for driving and rotating the winding shaft. Effect of the Invention

[0008] The ventilation fan shutter according to the present disclosure and the ventilation fan equipped with this ventilation fan shutter have the effect of suppressing noise and preventing damage to the blades. [Brief description of the drawings]

[0009] [Figure 1] FIG. 4 is a diagram showing an open state of the shutter according to the first embodiment. [Diagram 2] FIG. 4 is a diagram showing a closed state of the shutter according to the first embodiment. [Diagram 3] 4A and 4B are diagrams showing a connection structure of a chain blade of the shutter in accordance with the first embodiment. [Figure 4] 3 is a diagram showing the internal structure of a blade storage box of the shutter in accordance with the first embodiment. FIG. [Diagram 5] FIG. 2 is a cross-sectional view showing a state in which the ventilation fan according to the first embodiment is installed. [Figure 6] FIG. 4 is a block diagram showing a functional configuration relating to control of a ventilation fan. [Figure 7] 10 is a flowchart showing a control procedure for starting the operation of a ventilation fan. [Figure 8] 10 is a flowchart showing a control procedure for stopping the operation of a ventilation fan. [Figure 9] FIG. 11 is a diagram showing an open state of the shutter according to the second embodiment. [Figure 10] FIG. 11 is a diagram showing a closed state of the shutter according to the second embodiment. [Figure 11] 13 is a perspective view showing a chain blade of a shutter according to a second embodiment. FIG. [Figure 12] 11 is a diagram showing the internal structure of a motor storage box of a shutter according to a second embodiment. FIG. [Figure 13] 11(a) and 11(b) are cross-sectional views showing a state in which a ventilation fan according to a second embodiment is installed. [Figure 14] FIG. 4 is a block diagram showing a functional configuration relating to control of a ventilation fan. [Figure 15] 10 is a flowchart showing a control procedure for starting the operation of a ventilation fan. [Figure 16] 10 is a flowchart showing a control procedure for stopping the operation of a ventilation fan. [Figure 17] 2 is a diagram illustrating an example of a hardware configuration of a first control unit, a second control unit, and a third control unit. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals. The duplicated description of the parts will be appropriately simplified or omitted. In each drawing, the size relationship of each component may differ from the actual one.

[0011] Embodiment 1 FIG. 1 is a diagram showing an open state of the shutter 1 according to the first embodiment. FIG. 2 is a diagram showing a closed state of the shutter 1 according to the first embodiment. The shutter 1 is a shutter for a ventilation fan that opens and closes in conjunction with the operation of the axial fan. FIGS. 1 and 2 show the configuration of the shutter 1 as viewed from the axial fan side. Also, FIG. 2 shows the state with the cover of the blade storage box removed. The "axial fan" is also referred to as the "ventilation fan body."

[0012] As shown in Figures 1 and 2, the shutter 1 comprises a square frame 10 with an opening 11, and a chain blade 12 that opens and closes the opening 11. The frame 10 comprises an upper frame 10a provided at the top, a lower frame 10b provided at the bottom, and side frames 10c provided on the left and right sides, respectively. Furthermore, groove-shaped rails 13 extending vertically are formed on each of the opposing surfaces of the left and right side frames 10c. Furthermore, mounting holes 10d are formed in each corner of the frame 10.

[0013] The chain blade 12 includes a plurality of rectangular plates 14 connected vertically. As shown in Fig. 3, each rectangular plate 14 includes a hook member 14a provided at an upper end and a hook member 14b provided at a lower end. A pair of rectangular plates 14 adjacent vertically are joined by the hook member 14b of the upper rectangular plate 14 and the hook member 14a of the lower rectangular plate 14, and these rectangular plates 14 are rotatably connected. The left and right ends of each rectangular plate 14 are slidably inserted into each rail 13, respectively.

[0014] A blade storage box 15 is formed integrally with the frame 10 at the top of the upper frame 10a of the frame 10. A winding shaft 16 extending in the left-right direction is installed inside the blade storage box 15. A hook member 14a of the uppermost rectangular plate 14 of the multiple rectangular plates 14 of the chain blade 12 is attached to the winding shaft 16. As a result, the winding shaft 16 and the chain blade 12 are connected via the hook member 14a. As shown in Fig. 4, a rotating shaft 16a is provided at the left end of the winding shaft 16, and a bearing 17a is attached to the rotating shaft 16a. The bearing 17a is rotatably supported by a motor support plate 18a. A motor 19 is attached to the left surface of the motor support plate 18a. The rotating shaft 16a of the winding shaft 16 is connected to the tip of the shaft 19a of the motor 19. Similarly, a rotating shaft 16b is provided at the right end of the winding shaft 16, and a bearing 17b is attached to the rotating shaft 16b. The bearing 17b is rotatably supported by a bearing plate 18b. A control board 20 is installed to the right of the bearing plate 18b.

[0015] Fig. 5 is a cross-sectional view showing a state in which the ventilation fan 3 according to the first embodiment is installed on a wall 4 of a building. In Fig. 5, the right side of the wall 4 is the inside of the room, and the left side of the wall 4 is the outside of the room. As shown in Fig. 5, the ventilation fan 3 includes a shutter 1 and an axial fan 2. The axial fan 2 includes a fan 30 and a frame 31. The fan 30 includes blades 32 and a fan motor 33 that drives the blades 32. The fan motor 33 is supported on the frame 31 by four support legs 34. The four support legs 34 are members that extend radially from the fan motor 33 to the frame 31. An air duct 35 that is an air passage for the axial fan 2 is formed in the center of the frame 31.

[0016] A square wall hole 4a of the same size as the opening 11 of the shutter 1 is formed in the wall 4 of the building. The axial fan 2 and shutter 1 are fixed to the interior surface of the wall 4 with bolts and nuts, with the center of rotation of the axial fan 2 and the center of the opening 11 of the shutter 1 aligned with the center of the wall hole 4a. The blades 32 rotate in the air duct 35 as the fan motor 33 is driven, generating an air flow passing through an air passage consisting of the air duct 35, the opening 11, and the wall hole 4a.

[0017] Here, mounting holes (not shown) are formed in each corner of the frame 31 of the axial fan 2. When fixing the axial fan 2 and the shutter 1 to the wall 4 of a building, the mounting holes in the frame 31 and the mounting holes 10d in the frame 10 are aligned and then fastened together with bolts and nuts. The mounting holes 10d in the frame 10 are positioned so that the center of the opening 11 in the shutter 1 and the center of rotation of the axial fan 2 coincide with each other simply by aligning them with the mounting holes in the frame 31. In this way, by simply aligning the mounting holes in frame 31 and frame 10d and fastening them together with bolts and nuts, the center of opening 11 in shutter 1 and the center of rotation of axial fan 2 are aligned, eliminating the need for fine alignment and improving the efficiency of the installation work.

[0018] Fig. 6 is a block diagram showing a functional configuration related to the control of the ventilation fan 3. As shown in Fig. 6, a first control unit 40 is provided on a control board 20 of the shutter 1. The first control unit 40 is configured with electronic components mounted on the control board 20. The axial fan 2 also has a control board 21, and the control board 21 is provided with a third control unit 41. The third control unit 41 is configured with electronic components mounted on the control board 21.

[0019] The first control unit 40 and the motor 19 are connected by a signal line, and the drive of the motor 19 is controlled by a control signal transmitted from the first control unit 40. In addition, the third control unit 41 and the fan motor 33 are connected by a signal line, and the drive of the fan motor 33 is controlled by a control signal transmitted from the third control unit 41. In addition, the first control unit 40 and the third control unit 41 are connected by a signal line, and signals are transmitted and received between the first control unit 40 and the third control unit 41.

[0020] An external switch 42 that is operated by a user is provided inside the building. The external switch 42 and the first control unit 40 are connected by a signal line, and the first control unit 40 receives ON and OFF signals from the external switch 42. The first control unit 40 that receives the ON and OFF signals transmits and receives signals to and from the third control unit 41 to achieve synchronization, whereby the shutter 1 and the axial fan 2 operate in conjunction with each other.

[0021] Note that a signal line from the external switch 42 may be connected to the third control unit 41 so that the third control unit 41 can receive the ON and OFF signals from the external switch 42. Also, a signal line from the external switch 42 may be connected to both the first control unit 40 and the third control unit 41 so that both the first control unit 40 and the third control unit 41 can receive the ON and OFF signals from the external switch 42. In these cases as well, the shutter 1 and the axial fan 2 operate in conjunction with each other by transmitting and receiving signals between the first control unit 40 and the third control unit 41 and synchronizing them. Furthermore, the external switch 42 may be built into the frame 31 of the ventilation fan 3, or may be attached to the indoor wall surface of the wall 4. The external switch 42 may also be a remote control that the user can carry with him or her.

[0022] Next, the control procedure for starting the operation of the ventilation fan 3 will be described with reference to the flowchart of Fig. 7. First, when a user operates the external switch 42 to instruct the start of operation of the ventilation fan 3, the external switch 42 outputs an ON signal (step S10). The ON signal is sent to the first control unit 40, and the first control unit 40, having received the ON signal, sends a rotation signal to the motor 19 (step S11). The motor 19, to which the rotation signal has been input, rotates the shaft 19a based on the rotation signal, and the winding shaft 16 starts to rotate in accordance with this rotation (step S12).

[0023] By the rotation of the winding shaft 16, the chain blades 12 are wound up one by one, and the chain blades 12 slide upward along the left and right rails 13 (step S13). When the motor 19 rotates by a predetermined rotation angle A, all the chain blades 12 are wound up, and the chain blades 12 are stored in the blade storage box 15 (step S14). As a result, the opening 11 of the shutter 1 is opened.

[0024] When a sensor (not shown) detects that motor 19 has rotated by rotation angle A, the sensor outputs a detection signal (step S15). The detection signal is sent to first control unit 40, and first control unit 40, having received the detection signal, sends a rotation stop signal to motor 19 (step S16). Motor 19, to which the rotation stop signal has been input, stops the rotation of shaft 19a, and in conjunction with this stop of rotation, winding shaft 16 also stops rotating (step S17). Note that even after winding shaft 16 has stopped rotating, the coil inside motor 19 remains excited, and shaft 19a remains in a stopped state.

[0025] At the timing when the opening 11 of the shutter 1 opens, the first control unit 40 transmits a control signal to the third control unit 41 to start the operation of the axial flow fan 2 (step S18). The control signal is transmitted to the third control unit 41, and the third control unit 41, having received the control signal, transmits a rotation signal to the fan motor 33 (step S19). The fan motor 33, to which the rotation signal has been input, rotates the blades 32, generating an airflow that passes through an air passage consisting of the air channel 35, the opening 11, and the wall hole 4a (step S20). This airflow can ventilate the building.

[0026] At this time, since the chain blade 12 is stored in the blade storage box 15 arranged outside the air passage, the air flow passing through the opening 11 does not hit the chain blade 12. As a result, noise caused by the air flow hitting the chain blade 12 can be suppressed.

[0027] Next, the control procedure for stopping the operation of the ventilation fan 3 will be described with reference to the flowchart of Fig. 8. First, when a user operates the external switch 42 to instruct the operation of the ventilation fan 3 to be stopped, the external switch 42 outputs an OFF signal (step S30). The OFF signal is sent to the first control unit 40, and the first control unit 40, having received the OFF signal, sends a reverse rotation signal to the motor 19 (step S31). The motor 19, to which the reverse rotation signal has been input, rotates the shaft 19a in the reverse direction, and in accordance with this rotation, the winding shaft 16 starts to rotate in the reverse direction (step S32).

[0028] By the reverse rotation of the winding shaft 16, each rectangular plate 14 of the chain blade 12 is successively detached from the winding shaft 16, and the chain blade 12 slides downward along the left and right rails 13 (step S33). When the motor 19 rotates in the reverse direction by a rotation angle A, the chain blade 12 is fully unwound from the blade storage box 15, and the chain blade 12 covers the entire opening 11 of the shutter 1 (step S34). In this way, the chain blade 12 covers the opening 11, thereby preventing the intrusion of rain, wind, insects, and the like into the building.

[0029] When a sensor (not shown) detects that motor 19 has rotated in the reverse direction by rotation angle A, the sensor outputs a detection signal (step S35). The detection signal is sent to first control unit 40, and first control unit 40, having received the detection signal, sends a rotation stop signal to motor 19 (step S36). Motor 19, to which the rotation stop signal has been input, stops the reverse rotation of shaft 19a, and in conjunction with this stop of reverse rotation, winding shaft 16 also stops reverse rotation (step S37).

[0030] In parallel with the process of sending the reverse rotation signal to the motor 19 in step S31, the first control unit 40 sends a control signal to the third control unit 41 to stop the operation of the axial fan 2 (step S38). The third control unit 41, which has received the control signal, sends a rotation stop signal to the fan motor 33 (step S39). The fan motor 33, to which the rotation stop signal has been input, stops the rotation of the blades 32 (step S40). As a result, ventilation of the building by the axial fan 2 ends.

[0031] As described above, in the shutter 1 and ventilation fan 3 according to the first embodiment, when the axial fan 2 is in operation, the chain blade 12 is wound around the winding shaft 16 provided on the upper frame 10a of the frame 10. Since the winding shaft 16 is located outside the air passage, when indoor air is exhausted outside the building, the air flow passing through the air passage does not hit the chain blade 12. Therefore, no noise is generated by the chain blade 12. Furthermore, when air from outside the building is supplied into the room, the air flow that has hit the chain blade 12 and become turbulent is not sucked into the axial fan 2. Therefore, no noise is generated by the turbulent air flow. As a result, a highly quiet ventilation fan 3 can be obtained. Furthermore, since the chain blade 12 is not present on the wind path, even if a strong wind such as a typhoon blows, it is possible to prevent the chain blade 12 from being damaged by the large wind pressure of the wind.

[0032] Embodiment 2 Fig. 9 is a diagram showing an open state of the shutter 5 according to the second embodiment. Fig. 10 is a diagram showing a closed state of the shutter 5 according to the second embodiment. Fig. 10 shows a state in which the cover of the motor storage box is removed. Here, the shutter 5 according to the second embodiment differs from the shutter 1 according to the first embodiment only in the configuration for storing the chain blades, and the other configurations are the same as or equivalent to those of the first embodiment. For this reason, the same reference numerals are used to designate the same or equivalent parts as those of the first embodiment, and description of these parts will be omitted.

[0033] 9 and 10, the shutter 5 includes a chain blade 50 that opens and closes the opening 11 provided in the frame 10. The chain blade 50 includes a plurality of rectangular plates 51 connected vertically. Each rectangular plate 51 includes a hook member (not shown) provided at the upper end and a hook member (not shown) provided at the lower end, similar to the rectangular plate 14 in the first embodiment, and the rectangular plates 51 are rotatably connected by joining these hook members.

[0034] 11, the rectangular plates 51 include rectangular plates 51a and rectangular plates 51b arranged alternately in the up-down direction. Rectangular plate 51a includes pins 52 protruding from both side surfaces of the upper end portion. Rectangular plate 51b includes pins 52 protruding from both side surfaces of the lower end portion. A pair of pins 52 provided on each rectangular plate 51 is slidably inserted into each rail 13. As each pin 52 slides downward along rail 13, chain blade 50 is folded around the hook member.

[0035] A motor storage box 53 is formed integrally with the frame 10 at the upper left portion of the upper frame 10a of the frame 10. As shown in FIG. 12, a motor 19 is installed inside the motor storage box 53. The rotating shaft of the motor 19 is rotatably supported by the motor support plate 18a. A control board 54 is installed on the left side of the motor 19. A pulley 55 is attached to the tip of the rotating shaft of the motor 19, and the upper end of a belt 56 is attached to the pulley 55. The lower end of the belt 56 is attached to the pin 52 of the rectangular plate 51 arranged at the top. As a result, the pulley 55 and the pin 52 are connected via the belt 56. The attachment position of the lower end of the belt 56 is not limited to the pin 52, and may be, for example, the upper end of the rectangular plate 51 arranged at the top.

[0036] 13(a) and 13(b) are cross-sectional views showing a state in which a ventilation fan 6 according to embodiment 2 is installed on a wall 4 of a building. Note that Fig. 13(a) shows a state in which the shutter 5 is closed, and Fig. 13(b) shows a state in which the shutter 5 is open. As shown in Figures 13(a) and 13(b), the ventilation fan 6 includes a shutter 5 and an axial fan 2. A square wall hole 4a of the same size as the opening 11 of the shutter 5 is formed in the wall 4 of the building. The axial fan 2 and the shutter 5 are fixed to the indoor side surface of the wall 4 with bolts and nuts, with the center of rotation of the axial fan 2 and the center of the opening 11 of the shutter 5 aligned with the center of the wall hole 4a.

[0037] 13(b), when the shutter 5 is open, the chain blade 50 is folded and placed on the side of the wall hole 4a in the wall 4, which is the opposite side of the frame 10 from the axial fan 2. In this way, the folded chain blade 50 does not protrude to the side where the axial fan 2 is attached, preventing the folded chain blade 50 from interfering with the axial fan 2 and causing a malfunction.

[0038] Fig. 14 is a block diagram showing a functional configuration related to the control of the ventilation fan 6. As shown in Fig. 14, a second control unit 57 is provided on a control board 54 of the shutter 5. The second control unit 57 is composed of electronic components mounted on the control board 54. The second control unit 57 and the motor 19 are connected by a signal line, and the drive of the motor 19 is controlled by a control signal transmitted from the second control unit 57. The external switch 42 and the second control unit 57 are connected by a signal line, and the second control unit 57 receives the ON signal and the OFF signal output by the external switch 42. The second control unit 57 that receives the ON signal and the OFF signal transmits and receives signals to and from the third control unit 41 to achieve synchronization, whereby the shutter 5 and the axial fan 2 operate in conjunction with each other.

[0039] Next, the control procedure for starting the operation of the ventilation fan 6 will be described with reference to the flowchart of FIG. 15. First, when a user operates the external switch 42 to instruct the start of operation of the ventilation fan 6, the external switch 42 outputs an ON signal (step S50). The ON signal is sent to the second control unit 57, which receives the ON signal (step S51). The control board 54 has a B contact in the wiring for supplying power to the motor 19, and when the second control unit 57 receives the ON signal, the B contact is opened. As a result, the supply of power to the motor 19 is stopped (step S52). Note that the B contact is a normally-on contact.

[0040] When the supply of power to the motor 19 is stopped, no torque is applied to the rotating shaft of the motor 19, so that the weight of the chain blade 50 attached to the lower end of the belt 56 causes the belt 56 to be unwound from the pulley 55 (step S53). As the belt 56 is unwound, each pin 52 of the chain blade 50 slides downward along the rail 13 (step S54). Therefore, the chain blade 50 is folded at the bottom of the opening 11 and stored outside the air passage of the air flow passing through the opening 11 (step S55). As a result, the opening 11 of the shutter 5 is opened.

[0041] At the timing when the opening 11 of the shutter 5 opens, the second control unit 57 transmits a control signal to the third control unit 41 to start the operation of the axial flow fan 2 (step S56). The control signal is transmitted to the third control unit 41, and the third control unit 41, having received the control signal, transmits a rotation signal to the fan motor 33 (step S57). The fan motor 33, to which the rotation signal has been input, rotates the blades 32, generating an airflow that passes through an air passage consisting of the air channel 35, the opening 11, and the wall hole 4a (step S58). This airflow can ventilate the building.

[0042] At this time, since the chain blade 50 is folded to the lowest part of the opening 11, the air flow passing through the opening 11 does not hit the chain blade 50. As a result, noise caused by the air flow hitting the chain blade 50 can be suppressed.

[0043] Next, the control procedure for stopping the operation of the ventilation fan 6 will be described with reference to the flowchart of Fig. 16. First, when a user operates the external switch 42 to instruct the operation of the ventilation fan 6 to be stopped, the external switch 42 outputs an OFF signal (step S60). The OFF signal is sent to the second control unit 57, and the second control unit 57, which has received the OFF signal, sends a rotation signal to the motor 19 (step S61). The motor 19, to which the rotation signal has been input, rotates the pulley 55 (step S62).

[0044] The belt 56 is wound up by the rotation of the pulley 55, and each pin 52 of the chain blade 50 connected to the belt 56 slides upward along the rail 13 (step S63). Therefore, the chain blade 50 that was folded at the bottom of the opening 11 extends as the pin 52 moves, and when the motor 19 rotates by a predetermined rotation angle B, the chain blade 50 covers the entire opening 11 (step S64). In this way, the chain blade 50 covers the opening 11, thereby preventing rain, wind, insects, and the like from entering the building.

[0045] When a sensor (not shown) detects that motor 19 has rotated by rotation angle B, the sensor outputs a detection signal (step S65). The detection signal is sent to second control unit 57, and second control unit 57, having received the detection signal, sends a rotation stop signal to motor 19 (step S66). Motor 19, to which the rotation stop signal has been input, stops the rotation of pulley 55 (step S67). Note that even after pulley 55 stops rotating, the coil inside motor 19 remains excited, and pulley 55 maintains its stopped rotation state.

[0046] In parallel with the process of sending the rotation signal to the motor 19 in step S61, the second control unit 57 sends a control signal to the third control unit 41 to stop the operation of the axial fan 2 (step S68). The third control unit 41, which has received the control signal, sends a rotation stop signal to the fan motor 33 (step S69). The fan motor 33, to which the rotation stop signal has been input, stops the rotation of the blades 32 (step S70). As a result, ventilation of the building by the axial fan 2 ends.

[0047] As described above, in the shutter 5 and ventilation fan 6 according to the second embodiment, the chain blade 50 is folded at the bottom of the opening 11 when the axial fan 2 is in operation. Since the bottom of the opening 11 is located outside the air passage, when indoor air is exhausted outside the building, the air flow passing through the air passage does not hit the chain blade 50. Therefore, no noise is generated by the chain blade 50. Furthermore, when air from outside the building is supplied into the room, the air flow that has hit the chain blade 50 and become turbulent is not sucked into the axial fan 2. Therefore, no noise is generated by the turbulent air flow. As a result, a highly quiet ventilation fan 6 can be obtained. Furthermore, since the chain blade 50 is not present on the wind path, even if a strong wind such as a typhoon blows, it is possible to prevent the chain blade 50 from being damaged by the large wind pressure of the wind.

[0048] Fig. 17 is a diagram showing an example of the hardware configuration of the first control unit 40, the second control unit 57, and the third control unit 41. Fig. 17 shows the hardware configuration in the case where the functions of the first control unit 40, the second control unit 57, and the third control unit 41 are realized using hardware that executes a program. The first control unit 40, the second control unit 57, and the third control unit 41 each have a processor 60 and a memory 61.

[0049] The processor 60 is a CPU (Central Processing Unit). The processor 60 may be a processing device, an arithmetic unit, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor). The functions of the first control unit 40, the second control unit 57, and the third control unit 41 are realized by the processor 60, software, firmware, or a combination of software and firmware. The software or firmware is written as a program and stored in the memory 61, which is an internal memory. The memory 61 is a non-volatile or volatile semiconductor memory, and is a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), or an EEPROM (registered trademark) (Electrically Erasable Programmable Read Only Memory).

[0050] The configurations shown in the above embodiments are merely examples, and may be combined with other known techniques. Furthermore, parts of the configurations may be omitted or modified without departing from the spirit of the invention.

[0051] Various aspects of the present disclosure are summarized below as appendices.

[0052] (Appendix 1) A frame having an opening through which an airflow generated by operation of the ventilator main body passes; a chain blade that opens and closes the opening by a plurality of rectangular plates connected vertically; a rail provided on each of both side frames of the frame for vertically guiding both ends of the chain blade; A winding shaft is provided on an upper portion of the frame and winds or unwinds the chain blade; A shutter for a ventilation fan comprising: a motor that rotates and drives the winding shaft. (Appendix 2) The shutter for a ventilation fan as described in Appendix 1, further comprising a blade storage box into which the winding shaft is installed and which winds up and stores the chain blade on the winding shaft. (Appendix 3) A shutter for a ventilation fan as described in Appendix 1 or Appendix 2, further comprising a first control unit that controls the motor to open the opening by winding the chain blade onto the winding shaft, and to close the opening by unwinding the chain blade from the winding shaft. (Appendix 4) A frame having an opening through which an airflow generated by operation of the ventilator main body passes; a chain blade that opens and closes the opening by a plurality of rectangular plates connected vertically; A pair of pins are provided on both sides of each rectangular plate of the chain blade; rails provided on both side frames of the frame for guiding the pair of pins in the up and down direction, a belt attached to an upper portion of the chain blade; A pulley is provided on an upper portion of the frame and winds or unwinds the belt; A shutter for a ventilation fan comprising: a motor that rotates and drives the pulley. (Appendix 5) A shutter for a ventilation fan as described in Appendix 4, wherein, when the belt is unwound from the pulley, the chain blade is folded and placed on the opposite side of the ventilation fan body relative to the frame. (Appendix 6) A shutter for a ventilation fan as described in Appendix 4 or Appendix 5, further comprising a second control unit that controls the motor so that the chain blade is pulled up by winding the belt around the pulley to close the opening, and the chain blade is pulled down by unwinding the belt from the pulley to open the opening. (Appendix 7) A shutter for a ventilation fan described in any one of Appendix 1 to Appendix 6, wherein the frame is provided with mounting holes for fixing the frame together with the ventilation fan body to the wall to which it is to be attached, by aligning the center of the opening with the center of rotation of the ventilation fan body. (Appendix 8) A ventilation fan comprising the ventilation fan shutter according to any one of Supplementary Note 1 to Supplementary Note 7 and the ventilation fan main body. [Explanation of symbols]

[0053] 1,5 shutter, 2 axial fan (ventilator body), 3,6 ventilator, 4 wall, 10 frame, 10a upper frame, 10c side frame, 11 opening, 12,50 chain blade, 13 rail, 14,51 rectangular plate, 15 blade storage box, 16 winding shaft, 19 motor, 20,21,54 control board, 40 first control unit, 52 pin, 53 motor storage box, 55 pulley, 56 belt, 57 second control unit.

Claims

1. A frame having an opening through which an airflow generated by operation of the ventilator main body passes; a chain blade that opens and closes the opening by a plurality of rectangular plates connected vertically; a rail provided on each of both side frames of the frame for vertically guiding both ends of the chain blade; A winding shaft is provided on an upper portion of the frame and winds or unwinds the chain blade; A shutter for a ventilation fan comprising: a motor that rotates and drives the winding shaft.

2. 2. The shutter for a ventilation fan according to claim 1, further comprising a blade storage box in which the winding shaft is installed and in which the chain blade is wound around the winding shaft and stored.

3. A shutter for a ventilation fan as described in claim 1, further comprising a first control unit that controls the motor to open the opening by winding the chain blade onto the winding shaft and to close the opening by unwinding the chain blade from the winding shaft.

4. A frame having an opening through which an airflow generated by operation of the ventilator main body passes; a chain blade that opens and closes the opening by a plurality of rectangular plates connected vertically; A pair of pins are provided on both sides of each rectangular plate of the chain blade; rails provided on both side frames of the frame for guiding the pair of pins in the up and down direction, a belt attached to an upper portion of the chain blade; A pulley is provided on an upper portion of the frame and winds or unwinds the belt; A shutter for a ventilation fan comprising: a motor that rotates and drives the pulley.

5. The shutter for a ventilation fan according to claim 4 , wherein, when the belt is unwound from the pulley, the chain blade is folded and placed on the frame on the opposite side of the ventilation fan body.

6. A shutter for a ventilation fan as described in claim 4, further comprising a second control unit that controls the motor so that the chain blade is pulled up by winding the belt around the pulley to close the opening, and the chain blade is pulled down by unwinding the belt from the pulley to open the opening.

7. The shutter for a ventilation fan described in any one of claims 1 to 6, wherein the frame is provided with a mounting hole for fixing the frame together with the ventilation fan body to a wall to be mounted thereon, by aligning the center of the opening with the center of rotation of the ventilation fan body.

8. A ventilation fan comprising: the ventilation fan shutter according to any one of claims 1 to 6; and the ventilation fan body.

9. A ventilation fan comprising the ventilation fan shutter according to claim 7 and the ventilation fan body.

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