Automatic opening and closing device for a casement window

Abstract

To provide an automatic opening / closing device for a double sliding window with a small mounting space.SOLUTION: An automatic opening / closing device 1 for a double sliding window 100 includes a plurality of sashes 3 arranged in a window frame 2, a sash roller 323 provided in a stile 30 of each of the sashes 3, and a linear motor 40 for driving the sashes 3 to automatically open / close. The linear motor 40 includes a coil part 41 and a magnet part 42 which are applied with current, and the coil part 41 and the magnet part 42 are preferably arranged outside the sashes 3. The coil part 41 is preferably arranged on the side of the window frame 2, and the magnet part 42 is preferably arranged at a position facing the coil part 41 on the side of the sashes 3.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an automatic opening and closing device for a sliding window.

Background Art

[0002] Conventionally, an automatic door opening and closing device using a linear motor has been proposed for automatically opening and closing a door (see, for example, Patent Document 1). The linear motor is provided at the upper part of the door and is configured to move the shoji screen by a hoist.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In addition to the linear motor, other structural parts such as a hoist for moving the door are provided, so the opening and closing device becomes large-sized and a space for arranging the opening and closing device is required. For this reason, the opening and closing device is often installed simultaneously with the installation of the door where a space has been secured in advance, and it has not been easy to install it on an existing door.

Means for Solving the Problems

[0005] The present disclosure relates to an automatic opening and closing device for a sliding window, which includes a plurality of shoji screens arranged in a window frame, a wheel provided on the frame of the shoji screen, and a linear motor for automatically driving the opening and closing of the shoji screen.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0007] Hereinafter, the first embodiment of the present invention will be described in detail with reference to the drawings. The sliding window 100 is a fitting that is arranged at the opening 201 of the building 200 and opens and closes the opening 201. The sliding window 100 is configured to be automatically opened and closed by an automatic opening and closing device 1. FIG. 1 shows the sliding window 100 viewed from the indoor side. As shown in FIG. 1, the automatic opening and closing device 1 of the sliding window 100 includes a window frame 2, a shoji 3, a linear motor unit 4, a crescent lock 5, and a control unit 6.

[0008] The window frame 2 is installed inside the periphery of the opening 201. The window frame 2 has a frame body 20 and an inner lintel 24. The frame body 20 is formed by combining long-shaped profiles in a frame shape, and has an upper frame 21, a lower frame 22, left and right vertical frames 23, and an inner lintel 24. The upper frame 21 extends in the finding direction above the window frame 2. The lower frame 22 is arranged below the upper frame 21 and opposite to the upper frame 21, and extends in the finding direction. The vertical frames 23 extend in the vertical direction so as to connect the left and right ends of the upper frame 21 and the lower frame 22, and a pair of them are arranged on the left and right of the sliding window 100.

[0009] As shown in FIG. 2, the upper frame 21 has upper rail portions 211 that project toward the inner peripheral side of the frame body 20 on the indoor side and the outdoor side in the finding direction. The upper rail portions 211 are projections that guide the upper frame 31 described later. The lower frame 22 has lower rail portions 221 that project toward the inner peripheral side of the frame body 20 on the indoor side and the outdoor side in the finding direction. The lower rail portions 221 extend along the finding direction and are engaged with the door wheels 323 described later.

[0010] As shown in FIG. 2, the inner frame 24 is a plate-like member that is disposed on the indoor side of the upper frame 21 and the lower frame 22 and is disposed on the indoor side of the opening 201. The inner frame 24 extends in the finding direction along the upper frame 21 and the lower frame 22, and covers the upper and lower surfaces on the indoor side of the opening 201 in the looking direction.

[0011] The shoji 3 is disposed inside the frame body 20 and has a plurality of shoji including an inner shoji 310 and an outer shoji 320. The inner shoji 310 and the outer shoji 320 are formed to have the same size as each other. The inner shoji 310 is disposed on the indoor side of the frame body 20, and the outer shoji 320 is disposed on the outdoor side. The opening 201 is opened and closed by moving in the finding direction. The inner shoji 310 and the outer shoji 320 each have a frame 30 that is assembled in a frame shape inside the frame body 20 and a panel portion 35. The frame 30 has an upper frame 31, a lower frame 32, left and right vertical frames 33, and a summons frame 34.

[0012] The upper frame 31 extends in the finding direction inside the upper frame 21. As shown in FIG. 2, the upper frame 31 has an upper frame main body portion 311 and an upper frame glass holding portion 312. A slit 311a is formed on the surface of the upper frame main body portion 311 that faces the upper frame 21, and a rail holding portion 311b for holding the upper rail portion 211 of the upper frame 21 is disposed inside the upper frame main body portion 311. The upper rail portion 211 is inserted into the upper frame main body portion 311 from the slit 311a and held by the rail holding portion 311b. The upper frame glass holding portion 312 is formed in a substantially U shape that is open toward the inner peripheral side of the frame 30 in a cross-sectional view, and the panel portion 35 described later is held on the open side.

[0013] The lower frame 32 extends in the finding direction inside the lower frame member 22. The lower frame 32 has a lower frame main body portion 321, a lower frame glass holding portion 322, and a door wheel 323. A slit 321a is formed on the surface of the lower frame main body portion 321 facing the lower frame member 22, and the lower rail portion 221 is inserted through the slit 321a. The door wheel 323 is provided inside the lower frame main body portion 321 and engages with the lower rail portion 221 to rotate. Due to the rotation of the door wheel 323, the shoji 3 can move inside the lower frame 32. The lower frame glass holding portion 322 is formed in a substantially U shape that opens toward the inner peripheral side of the frame 30 in a cross-sectional view, and a panel portion 35 described later is held on the opened side.

[0014] The vertical frame 33 extends to connect the upper frame 31 and the lower frame 32 on the side facing the vertical frame member 23 in the inner shoji 310 and on the side facing the vertical frame member 23 in the outer shoji 320. The vertical frame 33 is formed in a substantially U-shaped cross-sectional shape that opens toward the inner peripheral side of the frame body 20 in the finding direction, and a panel portion 35 described later is held in the recess on the opened side.

[0015] As shown in FIG. 1, the calling frame 34 extends to connect the upper frame 31 and the lower frame 32, facing the vertical frame 33 in the finding direction in each of the inner shoji 310 and the outer shoji 320. The calling frame 34 is arranged at the central portion of the shoji 3 in the finding direction and extends in the vertical direction at the portion where the inner shoji 310 and the outer shoji 320 overlap in the looking-in direction. The calling frame 34 has an inner calling frame 341 provided in the inner shoji 310 and an outer calling frame 342 provided in the outer shoji 320. The calling frame 34 is formed in a substantially U-shaped cross-sectional shape that opens toward the vertical frame 33 side, and a panel portion 35 described later is held in the recess on the opened side.

[0016] The panel part 35 has a glass 351 and a grating channel 352. The glass 351 is a facing material that closes the opening 201. The panel part 35 has a multilayer glass, and two sheets of glass 351, one on the outdoor side and the other on the indoor side, are arranged on one shoji 3. The grating channel 352 is a rubber packing in a substantially U-shaped cross-section for holding two sheets of glass. The grating channel 352 is held in the concave portions of the upper frame glass holding part 312, the lower frame glass holding part 322, the vertical frame 33, and the calling frame 34 of the frame 30.

[0017] The linear motor part 4 is a driving part that can automatically drive and open / close the inner shoji 310. The linear motor part 4 is attached to an existing sliding window 100. The linear motor part 4 has a linear motor 40 and a bracket 43. The linear motor 40 has a coil part 41 and a magnet part 42. The coil part and the magnet part 42 are arranged outside the inner shoji 310. The linear motor 40 generates a magnetic field by passing an electric current through the coil part 41, and moves the inner shoji 310 in the finding direction by the attracting force between the N pole and the S pole and the repulsive force between the N poles and the S poles.

[0018] As shown in FIG. 2, the coil part 41 is arranged and fixed on the lower surface of the inner edge 24 of the window frame 2. As shown in FIG. 1, the coil part 41 is arranged at a substantially central portion in the finding direction of the inner edge 24. An electric current is applied to the coil part 41 from a power source (not shown).

[0019] The magnet part 42 is arranged on the indoor side surface of the upper frame 31 of the inner shoji 310 so as to extend from one side to the other side in the finding direction. The magnet part 42 has N-pole magnets and S-pole magnets arranged alternately. The magnet part 42 is arranged at a position below the coil part 41 and facing the coil part 41. Since the length of the magnet part 42 in the finding direction is longer than the length of the coil part 41 in the finding direction, as shown in FIG. 1, a part of the magnet part 42 extends beyond the coil part 41 to the side of the vertical frame 33.

[0020] The bracket 43 is a member that connects the magnet portion 42 to the shoji 3. The bracket 43 is connected to the upper end side of the inner sash frame 341. As shown in FIG. 2, the bracket 43 is formed in a substantially L shape in a longitudinal cross-sectional view. The bracket 43 has a frame connection portion 431 and a magnet connection portion 432. One end of the frame connection portion 431 is connected to the inner sash frame 341 and extends toward the indoor side in the prospective direction. The frame connection portion 431 is formed in a substantially U shape in a cross-sectional view and is attached so as to cover the prospective surface and the found surface of the inner sash frame 341. The magnet connection portion 432 extends upward from the indoor-side end of the frame connection portion 431 and is fixed to the outdoor-side surface of the magnet portion 42. Since the magnet portion 42 is connected to the inner shoji 310 by the bracket 43, the inner shoji 310 moves as the magnet portion 42 repels the coil portion 41 and makes a linear motion.

[0021] The crescent lock 5 is a key that fixes the inner shoji 310 and the outer shoji 320 so that the sliding window 100 cannot be opened. The crescent lock 5 has a pedestal 51, a crescent 52, a receiving fitting 53, and an unlocking sensor 54.

[0022] The pedestal 51 is fixed to a substantially central portion in the vertical direction of the inner sash frame 341. The crescent 52 is a locking portion rotatably fixed to the pedestal 51, and has a base portion 52a connected to the pedestal 51, a curved hanging portion 52b formed around the base portion 52a, and a lever 52c extending linearly from the hanging portion 52b. The receiving fitting 53 is fixed to the outer sash frame 342 and is disposed at a position corresponding to the hanging portion 52b. When the lever 52c is rotated, the hanging portion 52b rotates in accordance with the lever 52c and engages with the receiving fitting 53. Thereby, the crescent lock 5 is hung, and the inner shoji 310 and the outer shoji 320 are locked so as not to open.

[0023] The unlocking sensor 54 has a permanent magnet and a magnetic sensor, and detects whether the crescent lock 5 is unlocked or locked by detecting the rotational position of the crescent 52 magnetically. The unlocking sensor 54 is disposed on the base portion 52a. The unlocking sensor 54 can transmit the detection result to the control unit 6 via a wireless chip also disposed on the base portion 52a.

[0024] The control unit 6 is a central processing unit that drives the linear motor unit 4 according to the detection result of the unlocking sensor 54. The control unit 6 is arranged at a position not visible from the outside, such as inside the upper frame 21. The control unit 6 receives the detection result of the unlocking sensor 54 and gives an instruction to drive the linear motor unit 4. The unlocking sensor 54, the control unit 6, and the linear motor unit 4 constitute an electric opening and closing operation system for the sliding window 100.

[0025] As shown in FIGS. 3 and 4, when the crescent lock 5 is unlocked, the unlocking detection switch of the unlocking sensor 54 is turned on to detect that it has been unlocked (S1). Due to the detection by the unlocking sensor 54, the electric opening and closing operation system of the sliding window 100 by the linear motor unit 4 is activated. After the crescent lock 5 is unlocked, when the user of the sliding window 100 presses a button (not shown), for example, the opening and closing switch 56 for opening the shoji 3 is turned on (S2). When the opening and closing switch is turned on, the linear motor unit 4 is driven via the control unit 6 and operates to open the shoji 3 (S3). The opening and closing switch 56 may be arranged, for example, as a button on the indoor side surface of the inner calling frame 341. The opening and closing switch 56 may have a manual opening and closing switch 561 that opens only while the button is being pressed and an auto opening and closing switch 562 that fully opens by pressing the button once, and may be configured to be selectively pressed as appropriate during use.

[0026] When closing the shoji 3, the user presses a button to turn off the opening and closing switch 56 for closing the shoji 3 (S4). When the opening and closing switch 56 is turned off, the shoji 3 operates to close by the movement of the linear motor unit 4 via the control unit 6 (S5). In the state where the shoji 3 is closed, the unlocking sensor 54 detects whether the crescent lock 5 is unlocked. If the unlocking of the crescent lock 5 is not detected (S6), the opening and closing control of the shoji 3 in the electric opening and closing operation system of the sliding window 100 ends. If the unlocking of the crescent lock 5 is detected (S1), the opening and closing control of the shoji is performed again.

[0027] According to this embodiment, the following effects can be achieved. The automatic opening and closing device 1 includes a plurality of shoji doors 3 arranged in the window frame 2, a door wheel 323 provided on the frame 30 of the shoji door 3, and a linear motor 40 for driving the shoji door 3 to be automatically opened and closed. Since the shoji door 3 provided with the door wheel 323 is driven by the linear motor 40, it is not necessary to lift the shoji door 3 from above, and the automatic opening and closing device 1 for moving the shoji door 3 including the linear motor 40 can be miniaturized. As a result, the space required to provide the automatic opening and closing device 1 can be reduced. In addition, since the automatic opening and closing device 1 is small and the shoji door 3 is moved by the existing door wheel 323, it becomes possible to install the automatic opening and closing device 1 on the existing sliding window 100 later.

[0028] According to this embodiment, the linear motor 40 is configured to include a coil portion 41 and a magnet portion 42 to which an electric current is applied, and the coil portion 41 and the magnet portion 42 are arranged outside the shoji door 3. By arranging the linear motor 40 outside the shoji door 3, such as on the indoor side of the upper frame 31 of the shoji door 3, it becomes easier to retrofit the existing sliding window 100.

[0029] According to this embodiment, the coil portion 41 is arranged on the window frame 2 side, and the magnet portion 42 is arranged at a position facing the coil portion 41 on the shoji door 3 side. By attaching the coil portion 41 to the inner edge 24 of the window frame 2 and arranging the magnet portion 42 at a position facing the coil portion 41 on the shoji door 3 side, the shoji door 3 can be automatically opened and closed. As a result, it becomes easier to retrofit the automatic opening and closing device 1.

[0030] According to this embodiment, it further includes a bracket 43 for connecting the magnet portion 42 to the shoji door 3. The bracket 43 is connected to the inner mating frame 341 of the inner shoji door 310 arranged on the indoor side of the shoji door 3. By attaching the bracket 43 to the inner mating frame 341, the magnet portion 42 can be connected to the shoji door 3, so that the space required for installing the linear motor 40 can be reduced, and it becomes easier to retrofit the automatic opening and closing device 1 to the sliding window 100.

[0031] According to the present embodiment, the bracket 43 is formed in a substantially L-shaped cross-section, connected to the inner sliding frame 341, and includes a frame connection portion 431 connected to the inner sliding frame 341 and extending from the inner sliding frame 341 toward the indoor side, and a magnet connection portion 432 extending upward from the indoor-side end of the frame connection portion 431 and fixed to the outdoor-side surface of the magnet portion 42. This makes it easy to retroactively attach the bracket 43 to the shoji 3.

[0032] The magnet portion 42 is arranged to extend from one of the finding directions of the upper frame 31 of the shoji 3 to the other. Thereby, the linear motor 40 can obtain the power required for opening and closing the shoji 3, and the magnet portion 42 can be easily attached to the sliding window 100.

[0033] The present disclosure is not limited to the above-described embodiment, and modifications, improvements, etc. within the scope that can achieve the object of the present disclosure are included in the present disclosure. In the second embodiment, the linear motor 40A of the automatic opening / closing device 1A is arranged inside the upper frame 31. As shown in FIG. 5, the coil portion 41A is attached to the lower end side of the upper rail portion 211 on the inner shoji 310 side of the upper frame 21. The lower end of the upper rail portion 211 is inserted into the upper frame main body portion 311 through a slit 311a in the upper frame main body portion 311 of the upper frame 31. The coil portion 41A is arranged at a substantially central portion in the prospective direction inside the upper frame main body portion 311. The coil portion 41A is arranged at a substantially central portion in the finding direction of the sliding window 100 as shown in FIG. 1.

[0034] The magnet portions 42 are respectively arranged one by one between the rail holding portion 311b and the indoor-side surface of the upper frame main body portion 311 and between the rail holding portion 311b and the outdoor-side surface of the upper frame main body portion 311 inside the upper frame 31. Two magnet portions 42 are arranged so as to face each other on the indoor side and the outdoor side, and the coil portion 41A is arranged so as to be sandwiched between the two magnet portions 42.

[0035] Also according to the second embodiment, the inner shutter 310 moves due to the repulsion between the coil unit 41 and the magnet unit 42, similar to the first embodiment, and thus the same effects as the first embodiment are achieved. Furthermore, according to the second embodiment, since the linear motor 40A is built inside the upper frame 21 and the upper sash 31, it is not visible from the outside, improving the degree of freedom in the design of the appearance of the sliding window 100 and also improving the aesthetics.

[0036] As a modification of the first or second embodiment, the linear motors 40, 40A of the first or second embodiment may be arranged on the outer shutter 320. When the sliding window is arranged indoors in a building, there is no need to consider weather resistance. Therefore, if the linear motor 40 of the first embodiment is attached to the outer shutter 320, the appearance seen from the inner shutter 310 side will be neat. Regarding the linear motor 40A of the second embodiment as well, it can be attached at a desired position depending on the indoor configuration in the building, improving the degree of freedom in design.

[0037] In the above embodiment, an example where the opening and closing of the shutter 3 are performed by a button or the like (not shown) has been described. However, the opening and closing control of the shutter 3 may be performed by a remote controller or the like. Furthermore, the control unit may include a timer or the like. It may be set to automatically perform ventilation control of the room or building where the sliding window is provided upon the unlocking of the crescent lock 5.

[0038] FIG. 6 is a schematic diagram for explaining the automatic opening and closing device 1B of the sliding window according to the third embodiment. As shown in FIG. 6, in the third embodiment, the automatic opening and closing device 1B opens and closes a plurality of sliding windows 101, 102. The sliding windows 101, 102 are arranged at opposing positions in a building or a room, for example. The control unit 6 controls to open the sliding windows 101, 102 simultaneously. By opening the plurality of sliding windows 101, 102 simultaneously, natural ventilation is promoted.

[0039] FIG. 6 is a schematic diagram, and the sliding windows 101, 102 do not necessarily have to be two, and their sizes may also be different. In FIG. 6, the sliding windows 101, 102 are arranged opposite to each other. However, the arrangement of the plurality of sliding windows is not limited.

[0040] FIG. 7 is a schematic diagram for explaining a ventilation system 10 according to the fourth embodiment. The ventilation system 10 includes a ventilation fan 7 and an automatic opening / closing device 1C together with a plurality of sliding windows 103 to 105.

[0041] The plurality of sliding windows 103 to 105 are provided at any location inside the building 200, for example, on the dirt floor near the entrance, at a location with a balcony, in the living room, etc. The configuration of the sliding windows 103 to 105 is the same as that of the first embodiment.

[0042] The ventilation fan 7 is provided on a wall 202 that separates the outside and the inside of the building 200. The ventilation fan 7 includes a fan 71, a main body 72, and a ventilation fan control unit 73. The fan 71 has a plurality of blades and draws in outside air by rotating. The main body 72 houses the fan 71 and supports it rotatably. The ventilation fan control unit 73 controls the driving and stopping of the fan 71. The ventilation fan control unit 73 is electrically connected to the control unit 6 of the automatic opening / closing device 1C.

[0043] In the fourth embodiment, the opening and closing of the sliding windows 103 to 105 are controlled in conjunction with the ventilation fan 7. That is, when the user presses a switch (not shown) to operate the ventilation fan 7, a signal is transmitted from the ventilation fan control unit 73 to the control unit 6 of the automatic opening / closing device 1C. The control unit 6 receives a signal that the ventilation fan 7 has started operating. The control unit 6 drives the linear motor 40, and the shoji 3 of the sliding windows 103 to 105 is opened. Also, when the user presses the switch of the ventilation fan 7 to stop the operation of the ventilation fan 7, a signal is transmitted from the ventilation fan control unit 73 to the control unit 6 of the automatic opening / closing device 1C. The control unit 6 receives a signal that the ventilation fan 7 has stopped operating. The control unit 6 drives the linear motor 40, and the shoji 3 of the sliding windows 103 to 105 is closed, and the ventilation is terminated. The sliding windows that are opened and closed in conjunction with the ventilation fan 7 can be set arbitrarily, and may be all or part of the plurality of sliding windows 103 to 105. The drawing of the building 200 is an example, and the shape does not matter.

[0044] According to the ventilation system 10 of the fourth embodiment, forced ventilation is promoted by opening the shoji 3 of the sliding window 100 in conjunction with the ventilation fan 7. Without the user having to open and close the shoji of each individual sliding window 100, all the sliding windows 100 connected to the ventilation system 10 are opened and closed in conjunction by operating the ventilation fan 7 for ventilation, thus enhancing convenience.

Explanation of Signs

[0045] 1 Automatic opening and closing device, 2 Window frame, 3 Shoji, 6 Control unit, 7 Ventilation fan, 10, Joy system, 30 Frame, 40 Linear motor, 41 Coil part, 42 Magnet part, 43 Bracket, 73 Ventilation fan control unit, 100 Sliding window, 323 Door wheel, 341 Inner call frame, 431 Frame connection part, 432 Magnet connection part

Claims

**Claim 1**: An automatic opening and closing device for a sliding window having a plurality of sliding windows, comprising: a plurality of shoji doors disposed within the window frame; a pulley provided on the frame of the shoji door; a linear motor for driving the shoji door to be automatically opened and closed; a lock for fixing the shoji door; an unlocking sensor for detecting the open / closed state of the lock; a control unit for driving the linear motor, and having: the control unit performs control to drive the linear motor based on the detection result of the unlocking sensor; one sliding window and the other sliding window are disposed at positions facing each other in a building or a room; the control unit causes the shoji doors in the plurality of sliding windows to be opened and closed simultaneously; an automatic opening and closing device for a sliding window. **Claim 2**: the lock has a pedestal, a crescent rotatably fixed to the pedestal, and a receiving fitting fixed to the frame of the shoji door; the unlocking sensor has a permanent magnet and a magnetic sensor, and is disposed on the crescent, the automatic opening and closing device for a sliding window according to claim 1. **Claim 3**: the linear motor has a coil portion and a magnet portion to which current is applied; the coil portion and the magnet portion are disposed outside the shoji door, the automatic opening and closing device for a sliding window according to claim 1 or 2. **Claim 4**: the coil portion is disposed on the window frame side, and the magnet portion is disposed at a position facing the coil portion on the shoji door side, the automatic opening and closing device for a sliding window according to claim 3. **Claim 5**: further having a bracket for connecting the magnet portion to the shoji door; the bracket is connected to the inner calling frame of the inner shoji door disposed on the indoor side of the shoji door, the automatic opening and closing device for a sliding window according to claim 3 or 4. **Claim 6**: the bracket is formed in a substantially L-shaped cross-section; a frame connecting portion connected to the inner calling frame and extending from the inner calling frame to the indoor side; a magnet connecting portion extending upward from the indoor-side end of the frame connecting portion and fixed to the outdoor-side surface of the magnet portion, the automatic opening and closing device for a sliding window according to claim 5. **Claim 7**: the magnet portion is disposed so as to extend from one of the finding directions to the other on the upper frame of the shoji door, the automatic opening and closing device for a sliding window according to any one of claims 3 to 6. **Claim 8**: the linear motor has a coil portion and a magnet portion to which current is applied; the linear motor is disposed inside the frame, the automatic opening and closing device for a sliding window according to claim 1. **Claim 9**: The coil part is arranged at a substantially central part in the expected direction on the upper frame of the frame. The automatic opening and closing device for a sliding window according to claim 8, wherein the magnet part is arranged so as to face the indoor side and the outdoor side with the coil part interposed therebetween.

10. A ventilation fan provided in a wall separating the outside and the inside of a building, An automatic opening and closing device for a sliding window having a plurality of shoji arranged in a window frame, a pulley provided on the frame of the shoji, and a linear motor for automatically driving the opening and closing of the shoji, A control unit for controlling the opening and closing of the automatic opening and closing device, A ventilation fan control unit for controlling the opening and closing of the ventilation fan, and comprising: When the operation of the ventilation fan is started, at least one shoji is opened. A ventilation system in which when the operation of the ventilation fan is stopped, the one shoji that was opened when the operation was started is closed.

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