JP2011179743A - Natural ventilation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a natural ventilation device capable of reducing the trouble of manufacture while adequately responding to a sudden strong wind and positively preventing the strong wind from blowing indoors. <P>SOLUTION: This natural ventilation device includes: a flap 2 disposed inside a ventilation passage 1 communicating an opening part formed in an outer wall of a building and an internal part of the building, and opening and closing a ventilation port 9; and a driving part 3 for driving the flap 2. An upper end of the flap 2 is mounted on an inner surface of the ventilation passage 1 via a hinge 6. The flap 2 rocks with the hinge 6 as a shaft. The flap 2 opens the ventilation port 9 by rocking to the opening part side and closes the ventilation port 9 by rocking to the ventilation port 9 side. The flap 2 includes a balancer 25 for urging the flap 2 to the opening part side. The driving part 3 includes a rock allowing means 11 for allowing the flap 2 to rock to the ventilation port 9 side by wind flowing into the ventilation passage 1 when the flap 2 is in the state of opening the ventilation port 9. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a natural ventilation device provided for taking in outside air in a building such as an apartment house or an office building.

  As the simplest ventilation, a natural ventilation method has been conventionally used in which windows and shoji screens are opened to exchange outside air and room air. However, in high-rise buildings and the like, a structure in which windows cannot be opened and closed because a stronger wind than the ground is blown, and a forced ventilation system using a building air-conditioning system was adopted accordingly.

  In such a forced ventilation system, the operating cost of the air conditioning equipment is high, and there is a risk that ventilation is insufficient due to uneven air conditioning, or that a temperature difference occurs in the same room. As countermeasures, for example, as shown in Patent Documents 1 and 2, various ventilation devices using natural ventilation have been proposed.

  In the ventilation device of Patent Document 1, an automatic opening / closing valve is provided in a wind tunnel that communicates the inside and outside of a building, and the wind tunnel is opened and closed by the automatic opening / closing valve. Specifically, the automatic opening / closing valve swings about a support shaft provided at the upper and lower intermediate portions thereof (see FIG. 1 of Patent Document 1), and a valve driving device connected to the automatic opening / closing valve. Is operated by swinging. The valve drive device is configured to open and close the automatic open / close valve in accordance with an operation at the operation unit or a detection by wind speed detection.

  In the ventilation device of Patent Document 2, a blade member is provided in a passage communicating between the inside and outside of a building, and the passage is opened and closed by the blade member. Specifically, the blade member includes a pair of blade portions extending in opposite directions from the shaft, and swings about the shaft (see FIG. 1 of Patent Document 2). An electric motor is connected to the blade member via a transmission means such as a gear, and the electric motor swings the blade member in accordance with the operation by the switch or the detection result by the detector for detecting strong wind. It comes to drive.

  Further, in the ventilation device of Patent Document 2, a protrusion provided on a shaft to which a blade member is fixed is engaged with a notch formed in the gear of the transmission means and extending in an arc shape, and the blade member is notched. It can be freely swung within the formation range. Thus, when strong wind flows into the passage with the passage opened, the blade member is swung by the strong wind to block the passage even if the electric motor does not drive the blade member.

JP 2000-179906 A JP 2003-247737 A

  However, in the ventilation device of Patent Document 1, since the wind tunnel is closed by the automatic opening / closing valve only when the operation unit is operated or when strong wind is detected by detecting the wind speed, the automatic opening / closing valve is opened. For example, when a sudden strong wind flows into the wind tunnel, it cannot quickly respond to the strong wind. As a result, there is a problem that the strong wind may flow into the room and the documents in the room may blow away.

  In the ventilation device of Patent Document 2, there is a problem in that a notch is formed in the gear, which may cause a reduction in strength of the gear. Moreover, in the ventilation apparatus of patent document 2, since the intermediate part of a blade member is supported by the axis | shaft, one blade part (lower side in FIG. 1 of patent document 2) is a room (inside a building) side. In addition, the other blade part of the blade member (the upper side in FIG. 1 of Patent Document 2) swings to the outside (outside the building) side.

  In accordance with this movement, when the passage is closed with the blade member, the seal member that closes the gap between the peripheral edge of the blade member and the passage faces the indoor side at the upper part of the passage, and faces the outdoor side at the lower part of the passage. A complicated arrangement must be made, and it takes time and effort to manufacture the ventilation device. Further, a gap is likely to occur at the boundary between the seal member at the upper part of the passage and the seal member at the lower part of the passage, and there is a possibility that the gap between the peripheral edge of the blade member and the passage cannot be reliably closed.

  The present invention is intended to solve such inconveniences, and is a natural ventilation device capable of accurately dealing with sudden strong winds and reliably preventing strong winds from blowing into the room, while reducing manufacturing effort. Is to provide.

  The present invention solves the above inconvenience. That is, the present invention includes an air passage 1 that communicates an opening formed in an outer wall of a building and the inside of the building, and a flap 2 that is disposed in the air passage 1 and opens and closes the air vent 9 provided in the air passage 1. And the drive unit 3 for driving the flap 2, and the upper end of the flap 2 is attached to the inner surface of the air passage 1 via the hinge 6, so that the flap 2 swings around the hinge 6. The flap 2 swings to the opening side to open the vent 9, and swings to the vent 9 to close the vent 9. The flap 2 has a biasing means for biasing the flap 2 toward the opening, and the drive unit 3 has a ventilation path 1 when the flap 2 is in a state in which the vent 9 is opened. Allow the flap 2 to swing to the vent 9 side by the wind that has flowed into the inside. It is characterized in that is provided with swing allowing means 11. As the biasing means here, for example, one using a weight or one using a spring is applicable.

  As an urging means, you may comprise by the balancer 25 arrange | positioned in the upper end part by the side of the said building 2 of the flap 2. As shown in FIG. The balancer 25 urges the flap 2 toward the opening by its weight. The balancer 25 may include a weight 26 and an adjusting unit that adjusts the distance between the flap 2 and the weight 26. Further, the hinge 6 may be disposed on the opening side of the vent hole 9.

  Specifically, the drive unit 3 connects the motor 12, the shaft 12 connected to the output shaft 10 of the motor 8 via the swing allowing means 11, and the shaft 12 and the flap 2 to connect the shaft 12. And a crank mechanism 13 that converts the rotation of the motor 2 into the swing of the flap 2. The swing allowance means 11 is provided at the tip end portion 21 of the output shaft 10 of the motor 8 and is provided at the motor-side protrusion 21 a that protrudes toward the shaft side, and at one end portion 22 of the shaft 12 that faces the tip end portion of the output shaft 10. And a shaft-side protrusion 22a protruding to the motor side. The end face in the circumferential direction of the output shaft 10 in the motor-side protrusion 21a and the end face in the circumferential direction of the shaft 12 in the shaft-side protrusion 22a can come into contact with each other. Is closed, the rotational force of the motor 8 is transmitted to the shaft 12 by the contact between the circumferential end surface of the motor-side projection 21a and the circumferential end surface of the shaft-side projection 22a, whereby the flap 2 is driven. It has become so. When the vent hole 9 is opened, the flap 2 can swing because the shaft-side protrusion 22a can move away from the motor-side protrusion 21a. Here, the case where the motor 8 is directly connected to the output shaft 10 and the case where the motor 8 is connected to the output shaft 10 via a reduction mechanism or the like are included. The motor-side protrusion 21a and the shaft-side protrusion 22a may be arranged one by one, but a plurality may be arranged in consideration of the strength of the protrusions 21a and 22a.

  Further, a stopper 7 that receives the flap 2 and restricts the swinging of the flap 2 toward the opening is disposed in the air passage 1, and the stopper 7 has a cushioning material 7 a disposed on the flap side. is doing.

  The flaps 2 may be arranged in two upper and lower stages with respect to the vent hole 9, and the upper and lower flaps 2, 2 may be interlocked by being connected by a connecting rod 40.

  The natural ventilator of the present invention is provided with the swing permitting means 11 that allows the flap 2 to swing toward the vent 9 while the vent 9 is open. When the air flows into the passage 1, the flap 2 swings by the wind pressure, and the vent 9 can be closed. As a result, it is possible to prevent the strong wind from flowing into the room inside the building and blowing out documents in the room. Further, by providing the swing allowance means 11, the flap 2 can swing to an opening degree corresponding to the wind flowing into the ventilation path 1, thereby adjusting the wind flowing into the building to an appropriate air volume. be able to.

  Further, since the upper end of the flap 2 is attached to the inner surface of the air passage 1 via the hinge 6 and the flap 2 swings around the upper end, that is, the hinge 6, the entire flap swings in the same direction. Move. That is, for example, the operation of swinging the upper part toward the inside of the building and the lower part toward the outside of the building as in Patent Documents 1 and 2 does not occur. Thereby, for example, even if the water stop member 5 is disposed only at the periphery of the vent 9 on the side facing the flap 2, when the flap 2 closes the vent 9, the water stop member 5 causes the periphery of the vent 9 and the flap to be closed. 2 can be reliably closed. In addition, since the water stop member 5 has only to be disposed at the periphery of the vent 9 on the side facing the flap 2, the labor for manufacturing the natural ventilation device is reduced accordingly.

  If the urging means is constituted by the balancer 25, the balancer 25 itself has no operating part, so there is no possibility that the balancer 25 will break down, and therefore the reliability of the urging means can be increased.

  If the balancer 25 has adjusting means for adjusting the distance between the flap 2 and the weight 26, the air vent is opened by the wind that the flap 2 in the opened state flows into the air passage 1 by adjusting the distance. The wind speed when swinging to the 9 side can be arbitrarily set. Thereby, it is possible to reliably avoid that the flap 2 does not close the vent 9 even if the wind is weak, or that the flap 2 does not close the vent 9 until the wind becomes strong and strong.

  If the hinge 6 is disposed on the opening side of the vent hole 9, the center O3 of the swing shaft 6a of the hinge 6 and the center of gravity G1 of the flap 2 can be brought close to each other, and the center of gravity G1 of the flap 2 The moment can be reduced. Even if the weight of the balancer 25 is reduced by that amount, the flap 2 can be urged toward the opening of the outer wall of the building, and the cost of the natural ventilation device can be reduced by the amount that the weight of the balancer 25 can be reduced. .

  When the vent 9 is closed, the rotational force of the motor 8 is transmitted to the shaft 12 by the contact between the circumferential end surface of the motor-side protrusion 21a of the swing allowing means 11 and the circumferential end surface of the shaft-side protrusion 22a. When the flap 2 is driven and the vent 9 is opened, the shaft-side protrusion 22a can move away from the motor-side protrusion 21a, and the flap 2 can swing. The structure of the swing allowing means 11 is not excessively complicated, and this can also reduce the cost of the natural ventilation device.

  If the stopper 7 having the cushioning material 7a on the flap side is disposed in the ventilation path 1, it is possible to prevent the flap 2 from excessively swinging and to shock the flap 2 when it hits the stopper 7 by the cushioning material 7a. Can be surely prevented from causing discomfort to the people inside the building due to the impact sound transmitted to the inside of the building.

  When the upper and lower flaps 2 and 2 are connected by the connecting rod 40 and interlocked, when the strong wind blows into the air passage 1, the wind speed of the strong air is different between the upper and lower sides of the air passage 1. 2 does not close the vent 9 of the ventilation path 1, and it is possible to reliably prevent strong wind from flowing into the room.

It is a vertical side view of the natural ventilation apparatus which concerns on Example 1 of this invention. It is the top view cut | disconnected by the AA line of FIG. It is a vertical side view which shows the state which the flap which concerns on the natural ventilation apparatus of Example 1 opened the vent hole. It is a longitudinal cross-sectional view which shows the principal part of the rocking | fluctuation permission means which concerns on the natural ventilation apparatus of Example 1. It is the top view cut | disconnected by the BB line of FIG. It is a vertical side view of the balancer which concerns on the natural ventilation apparatus of Example 1. FIG. It is a longitudinal cross-sectional view for demonstrating operation | movement of the rocking | fluctuation permission means which concerns on the natural ventilation apparatus of Example 1. FIG. It is a vertical side view of the natural ventilation apparatus which concerns on Example 2 of this invention. It is a vertical side view of the natural ventilation apparatus which concerns on Example 3 of this invention.

(Example 1) Example 1 of the natural ventilation apparatus according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the natural ventilation device includes an air passage 1 that connects an opening (not shown) formed in the outer wall of the building and the inside of the building, and the air passage 1 that is disposed in the air passage 1. The flap 2 that opens and closes the air vent 9 provided in the door and the drive unit 3 that drives the flap 2 are provided. The air passage 1 has a front (left side in FIG. 1) communicating with the opening of the building outer wall and a rear (right side in FIG. 1) communicating with the interior of the building. Then, the outside air outside the building and the air inside the building are exchanged through the ventilation path 1 by a natural ventilation system.

  As shown in FIGS. 1 and 2, the flap 2 has a horizontally long (horizontal direction in FIG. 2) rectangular parallelepiped shape and a hollow structure. The air passage 1 is constricted at an intermediate portion thereof, and a water stop member 5 made of rubber or the like is provided on the front side (left side in FIG. 1) of the air vent 9 located in the constricted portion (intermediate portion) 4. It arrange | positions along the periphery of the said vent hole 9 at frame shape. The vent 9 of the constricted part 4 is formed in a square shape. The flap 2 is pressed against the water stop member 5 and comes into close contact with the flap 2 in the fully closed posture (the solid line posture in FIG. 1) in which the vent 9 of the vent passage 1 is fully closed. Thereby, when the vent hole 9 is fully closed, strong wind and rainwater are reliably prevented from being blown into the building through the vent path 1. Further, the impact when the flap 2 collides with the constricted portion 4 is mitigated by the water stop member 5.

  The swing side of the hinge 6 is attached to the upper end of the front surface (opening side) of the flap 2, and the fixed side of the hinge 6 is attached to the upper end of the inner surface of the air passage 1 on the front side of the vent 9. Yes. As a result, the flap 2 swings about the hinge 6 as an axis. The flap 2 swings forward to open the vent 9 and swings backward (vent side) to close the vent 9.

  Thus, since the flap 2 swings about the hinge 6, that is, the upper end of the flap 2, the entire flap swings in the same direction. That is, for example, the operation of swinging the upper part toward the inside of the building and the lower part toward the outside of the building as in Patent Documents 1 and 2 does not occur. Thereby, when the flap 2 closes the vent hole 9, the gap between the peripheral edge of the vent hole 9 and the flap 2 is surely blocked by the water-stopping member 5 disposed only on the peripheral edge of the vent hole 9 on the side facing the flap 2. be able to.

  Further, a stopper 7 is disposed on the front side of the constricted portion 4 and on the upper portion of the air passage 1, and the flap 2 is received by the stopper 7 (see the phantom line in FIG. 1 and FIG. 3), and the front side of the flap 2. It is designed to regulate the swinging to. A cushioning material 7 a such as rubber is disposed on the surface of the stopper 7 on the side of the flap 2, and the impact when the flap 2 hits the stopper 7 is mitigated. In the air passage 1, the passage cross-sectional area on the front side (opening side) of the narrowed portion 4 is larger than the cross-sectional area of the rear side (building interior side) of the narrowed portion 4.

  As shown in FIGS. 1 and 2, the drive unit 3 is connected to a motor 8 incorporating a speed reduction mechanism (not shown) such as a worm gear and an output shaft 10 of the motor 8 via a swing allowance means 11. And a pair of left and right crank mechanisms 13 and 13 that connect the shaft 12 and the flap 2 to convert the rotation of the shaft 12 into swinging of the flap 2. As described above, the output shaft 10 and the shaft 12 of the motor 8 are connected (coupled) via the rocking permission means 11 and are not directly connected. The motor 8 is an AC motor or the like. The swing allowance means 11 allows the flap 2 to swing toward the vent 9 by the wind flowing into the vent path 1 when the flap 2 is in the state of opening the vent 9. .

  The shaft 12 extends horizontally in the left-right direction along the flap 2 (see FIG. 2). The left and right ends of the shaft 12 are supported by the left and right side walls 1a and 1b of the inner surface (inner wall) of the ventilation path 1 via bearings 20 and 20, respectively.

  Each crank mechanism 13 includes a connecting tool 14 fixed to the shaft 12, an arm 15 having one end fixed to the connecting tool 14 and extending linearly in the radial direction of the shaft 12, and a crank connected to the other end of the arm 15. It has a linear rod 17 whose one end is swingably connected via a pin 16 and a fixing member 19 which is swingably connected to the other end of the rod 17 via a crankpin 18. ing. The front surface of the fixture 19 is fixed to the rear surface (the building interior side) of the lower end of the flap 2. Then, when the motor 8 is driven and the shaft 12 rotates counterclockwise in FIG. 1, the lower end of the flap 2 is pulled backward by the fixture 19 of the crank mechanism 13, and the flap 2 is moved backward. Swing. On the other hand, when the shaft 12 rotates clockwise in FIG. 1, the flap 2 swings forward.

  As shown in FIGS. 2 and 4, the swing allowing means 11 is a pair of motor-side protrusions 21 a and 21 a provided on the motor-side shaft portion 21 that is the tip end portion (right end in FIG. 2) of the output shaft 10 of the motor 8. And a pair of shaft side protrusions 22a and 22a provided on the shaft side shaft portion 22 which is one end portion (left end in FIG. 2) of the shaft 12 facing the motor side shaft portion 21. Each motor-side protrusion 21 a protrudes from the front end surface of the motor-side shaft portion 21 to the shaft side, and each shaft-side protrusion 22 a protrudes from the front end surface of the shaft-side shaft portion 22 to the output shaft side of the motor 8.

  As shown in FIG. 4, the protrusions 21 a and 22 a of the motor-side shaft portion 21 and the shaft-side shaft portion 22 are each formed in a fan shape that expands toward the outer peripheral side in a longitudinal sectional view. The shaft-side protrusions 22a and 22a are respectively positioned in a pair of blank regions (play) 23 and 23 formed between the motor-side protrusions 21a and 21a. The end surface in the circumferential direction of the output shaft 10 of the motor 8 in the motor-side projection 21a and the end surface in the circumferential direction of the shaft 12 in the shaft-side projection 22a can come into contact with each other.

  When the flap 2 is driven by the drive unit 3 to close the air vent 9, the rotational force of the motor 8 is brought into contact with the circumferential end surface of the motor side projection 21a and the circumferential end surface of the shaft side projection 22a. Is transmitted to the shaft 12 so that the flap 2 is driven. When the vent hole 9 is opened, the flap 2 can swing because the shaft-side protrusion 22a can move away from the motor-side protrusion 21a. That is, when the vent hole 9 is opened, the shaft 12 can idle in the blank areas 23 and 23.

  Specifically, as shown in FIG. 4, the pair of motor side protrusions 21 a and 21 a are provided at positions symmetrical to each other with respect to the axis O <b> 1 of the output shaft 10 of the motor 8. The protrusions 22a and 22a are provided at positions that are symmetrical to each other with respect to the axis O2 of the shaft 12. The output shaft 10 and the shaft 12 of the motor 8 are arranged so that the axis O1 of the output shaft 10 and the axis O2 of the shaft 12 are located on the same line.

  The opening angle θ1 between the circumferential end surface of one motor-side projection 21a and the circumferential end surface of the other motor-side projection 21a is set to be, for example, about 140 degrees. Further, the opening angle θ2 between the circumferential end surface of one shaft-side protrusion 22a and the circumferential end surface of the other shaft-side protrusion 22a is set to be, for example, about 140 degrees. The angle θ3 between both end faces in the circumferential direction of each motor-side protrusion 21a is set to be, for example, about 40 degrees, and the angle θ4 between both end faces in the circumferential direction of the shaft-side protrusion 22 is, for example, about 35 degrees. It is set to be. As a result, the shaft 12 can rotate about 115 degrees, for example, while the output shaft 10 of the motor 8 is stopped.

  As shown in FIGS. 1 and 5, a balancer 25 as an urging means is disposed at the upper end of the outer surface on the rear side (inside the building) of the flap 2. The balancer 25 includes a horizontally long circular rod-shaped weight 26 extending horizontally in the left-right direction along the flap 2, a pair of support members 27, 27 disposed on the left and right of the weight 26, and an upper end portion of the flap 2. And fixing members 28 and 28 fixed to the rear outer surface. 1 is urged to the flap 2 by the weight of the balancer 25 (mainly the weight of the weight 26). That is, the flap 2 is biased toward the opening by the balancer 25.

  As shown in FIG. 6, each support member 27 of the balancer 25 is formed in an L shape as viewed in a longitudinal side view, continuously provided on an outer fitting portion 27 a that is fitted on the weight 26, and a lower end of the outer fitting portion 27 a. And an angle 27b. The fixing member 28 is formed in an L shape in a longitudinal side view, and one end portion 28 a (left side in FIG. 6) extending in the vertical direction in FIG. 6 is fixed to the flap 2. 6 is formed on the upper surface of the other end portion 28b of the fixing member 28 extending in the left-right direction in FIG. 6, and the lower surface of the lower portion extending in the left-right direction in FIG. Triangular wave-shaped irregularities are formed. Then, the triangular wave-shaped unevenness of the other end portion 28 b of the fixing member 28 and the triangular wave-shaped unevenness of the angle 27 b of the support member 27 mesh with each other, so that the support member 27 is displaced on the other end portion 28 b of the fixing member 28. It is prevented from moving.

  A long hole 29 extending in the front-rear direction is formed in the other end portion 28b of the fixing member 28, and a bolt 30 passes through the long hole 29 through a through hole 31 provided in a lower portion of the angle 27b. The support member 27 can be fixed to the fixing member 28 by tightening the nut 32 to the lower end of the bolt 30. As described above, since the elongated hole 29 of the fixing member 28 extends in the front-rear direction, the front-rear distance between the flap 2 and the weight 26 can be arbitrarily adjusted.

  Next, operation | movement of the natural ventilation apparatus of Example 1 is demonstrated using drawing. For example, when the motor 8 is driven by, for example, a switch of an operation unit (not shown) when the flap 2 is in the phantom line posture (fully open posture) of FIG.・ 21a rotates counterclockwise in FIG. 4, and the upstream end surface in the rotation direction comes into contact with the end surfaces of the shaft side protrusions 22a and 22a (see the state of FIG. 4), and the shaft side protrusions 22a and 22a are moved as they are. Energize counterclockwise.

  Thereby, the rotational force of the motor 8 is transmitted to the shaft 12, the shaft 12 rotates counterclockwise, the lower end of the flap 2 is pulled backward by the crank mechanism 13, and the flap 2 swings backward. . Thereafter, the flap 2 is pressed against the water stop member 5, and the vent 9 of the air passage 1 is closed by the flap 2 (state in FIG. 1: fully closed state). When the flap 2 is fully closed, the motor 8 is stopped and the motor side shaft portion 21 of the swing allowing means 11 is in a non-rotatable state. Therefore, even if the flap 2 tries to swing forward, the clockwise rotation of the shaft-side protrusions 22a and 22a associated therewith is prevented by the motor-side protrusions 21a and 21a, and swinging of the flap 2 to the front side is prevented. Since the flap 2 is pressed against the water stop member 5, the flap 2 is also prevented from swinging backward. Thereby, the state which closed the ventilation hole 9 of the ventilation path 1 with the flap 2 is maintained.

  When the motor 8 is driven by the switch or the like of the operation unit in the fully closed state and the motor side protrusions 21a and 21a of the swing allowing means 11 are rotated clockwise from the state of FIG. Since the clockwise rotational force due to the weight of the balancer 25 is urged, the shaft-side protrusions 22a and 22a contact the motor-side protrusions 21a and 21a as the motor-side protrusions 21a and 21a rotate clockwise. Rotate clockwise while still in contact. As a result, the shaft 12 rotates clockwise, and the flap 2 swings forward. The flap 2 stops in contact with the buffer material 7a of the stopper 7 (fully opened state in FIG. 3). In this state, the outside air outside the building and the air inside the building are exchanged via the air passage 1 for ventilation.

  When the flap 2 is fully opened, the motor 8 is stopped and the motor-side shaft portion 21 of the swing allowing means 11 is not allowed to rotate, but the shaft-side protrusions 22a and 22a are formed as described above. Further, the motor-side projections 21a and 21a are in contact with the motor-side protrusions 21a and 21a by the clockwise rotational force due to the weight of the balancer 25, and can rotate counterclockwise within the blank areas 23 and 23. Therefore, for example, when strong wind blows into the ventilation path 1 from the opening of the outer wall of the building described above, the shaft 12 idles within the blank areas 23 and 23, and the flap 2 can swing backward.

  Specifically, the flap 2 in the fully open state is set so that the flap 2 starts to swing backward with, for example, a wind speed of 5 m / s or more, and the flap 2 is in the fully closed state in FIG. 1 at a wind speed of 10 m / s or more. ing. When the wind flowing into the air passage 1 becomes lower than the wind speed of 5 m / s, it swings forward by the weight of the balancer 25 and returns to the fully opened state of FIG. The setting is performed by adjusting the front-rear distance between the flap 2 and the weight 26 of the balancer 25.

  Since the hinge 6 is attached to the front side of the vent hole 9 as described above, the distance L1 between the axis O3 of the swing shaft 6a of the hinge 6 and the center of gravity G1 of the flap 2 as shown in FIG. The hinge 6 can be made smaller than the case where it is attached to the rear side of the constricted portion 4. Thereby, the moment by the gravity center G1 of the flap 2 can be reduced, and the flap 2 can be urged toward the opening side of the building outer wall even if the weight of the balancer 25 is reduced by that much.

  As described above, in the present invention, the rocking permission means 11 is provided, so that, for example, when a sudden strong wind flows into the ventilation path 1, the flap 2 is rocked by the wind pressure to close the vent hole 9. Can do. Further, by providing the swing allowance means 11, the flap 2 can be swung to an opening degree corresponding to the wind flowing into the air passage 1, thereby adjusting the wind flowing into the building to an appropriate air volume. be able to.

  Further, since the upper end of the flap 2 swings around the hinge 6, the entire flap swings in the same direction. That is, for example, the operation of swinging the upper part toward the inside of the building and the lower part toward the outside of the building as in Patent Documents 1 and 2 does not occur. As a result, when the flap 2 closes the vent 9, the gap between the peripheral edge of the vent 9 and the flap 2 can be reliably closed by the water stop member 5.

(Example 2) Example 2 of the natural ventilation apparatus according to the present invention will be described with reference to FIG. In the natural ventilation device of the second embodiment, the vent 9 of the constricted portion 4 of the vent passage 1 is divided into two upper and lower openings 36 and 36, and the flaps 2 are arranged in the openings 36, respectively. That is, the flaps 2 and 2 are arranged in two upper and lower stages with respect to the vent hole 9.

  The drive unit 37 according to the second embodiment is configured to drive both flaps 2 and 2 with a single motor 8. Specifically, the motor 8 of the drive unit 37 is connected to an output shaft (not shown) in the lower stage (lower side in FIG. 8) via a speed reduction mechanism (not shown) such as a built-in worm gear. The lower output shaft is connected to the lower crank mechanism 13. The lower crank mechanism 13 is connected to the lower flap 2. The lower-stage output shaft and the lower-stage shaft 12 are connected to each other through a swing allowing means having the same configuration as that of the first embodiment.

  The output of the motor 8 of the drive unit 37 is connected to an output shaft (not shown) on the upper stage (upper side in FIG. 8) via the rotary shaft 38 and the rotation direction conversion mechanism 39, and the upper output shaft. Is connected to the upper crank mechanism 13. The upper crank mechanism 13 is connected to the upper flap 2. The upper stage output shaft and the upper stage shaft 12 are connected via a swing allowing means having the same configuration as in the first embodiment.

  The lower ends of the upper and lower flaps 2 and 2 are connected to each other by a connecting rod 40 extending in the vertical direction, and the flaps 2 and 2 are swung in conjunction with each other by the connecting rod 40. Specifically, a fixture 41 is attached to the lower end of the front surface of each flap 2 (left side in FIG. 8), and the upper and lower ends of the connecting rod 40 are rocked to the fixture 41 via swing pins 42 and 42, respectively. It is linked movably. Since the other points are the same as in the first embodiment, the same functions are denoted by the same reference numerals and the description thereof is omitted.

  Thus, in the natural ventilation apparatus of Example 2, since the upper and lower flaps 2 and 2 are interlocked, for example, when strong wind blows into the air passage 1 when the flap 2 is fully open. Even if the wind speed of the strong wind is different between the upper and lower sides of the air passage 1, the flap 2 hit by the strong wind with the wind speed of 5m / s or more starts to swing first, and the other flap 2 is interlocked accordingly. Start swinging. And when the strong wind of wind speed 10m / s or more hits one flap 2, the said flap 2 will be in a fully closed state, and the other flap 2 will also be in a fully closed state in connection with it.

  Accordingly, for example, when strong wind blows into the air passage 1, the wind speed of the strong wind is different between the upper and lower sides of the air passage 1, so that one of the flaps 2 does not close the opening 36 of the air vent 9 of the air passage 1. It is possible to reliably prevent strong winds from flowing into the room.

(Example 3) Example 3 of the natural ventilation apparatus according to the present invention will be described with reference to FIG. The natural ventilation device according to the third embodiment has substantially the same function as the natural ventilation device according to the second embodiment. A different point is that the connecting rod 40 for interlocking the upper and lower flaps 2 and 2 is connected to each balancer 25 of the upper and lower flaps 2 and 2, respectively. That is, the mounting portions 45 and 45 protrude rearward from the support members 27 of the balancers 25 of the upper and lower flaps 2 and 2, and the upper and lower ends of the connecting rod 40 are swung to the rear ends of the mounting portions 45 and 45, respectively. The pins 46 and 46 are connected so as to be swingable. Since the other points are the same as those of the second embodiment, the same functions are denoted by the same reference numerals and the description thereof is omitted.

  With this configuration, even in the third embodiment, for example, when strong wind blows into the ventilation path 1, even if the wind speed of the strong wind is different between the upper and lower sides of the ventilation path 1, the ventilation path 1 is formed by both flaps 2 and 2. Therefore, it is possible to reliably prevent the strong wind from flowing into the room.

  In the first embodiment, the motor-side protrusion 21a and the shaft-side protrusion 22a may be arranged one by one. In each of the swing allowing means of the second and third embodiments, the motor-side protrusion 21a and the shaft-side protrusion 22a may be arranged one by one.

DESCRIPTION OF SYMBOLS 1 Ventilation path 2 Flap 3 Drive part 6 Hinge 7 Stopper 7a Buffer material 8 Motor 9 Vent 10 Output shaft 11 Oscillation permissible means 12 Shaft 13 Crank mechanism 21 Motor side shaft part 21a Motor side protrusion 22 Shaft side shaft part 22a Shaft side Projection 25 Balancer 26 Weight 40 Connecting rod

Claims (7)

An air passage (1) communicating the opening formed in the building outer wall with the inside of the building, and an air vent (9) disposed in the air passage (1) and provided in the air passage (1) is opened and closed. A flap (2) and a drive unit (3) for driving the flap (2);
Since the upper end of the flap (2) is attached to the inner surface of the air passage (1) via the hinge (6), the flap (2) swings around the hinge (6) as an axis. And
The flap (2) swings toward the opening to open the vent (9), while swinging toward the vent (9) closes the vent (9). ,
The flap (2) has a biasing means for biasing the flap (2) toward the opening,
The flap (2) is swung toward the vent (9) by the wind that flows into the vent (1) when the flap (2) opens the vent (9). A natural ventilation device characterized in that it is provided with swinging permission means (11) for allowing movement. The biasing means is constituted by a balancer (25) arranged at the upper end of the flap (2) on the building interior side,
The natural ventilator according to claim 1, wherein the balancer (25) biases the flap (2) toward the opening by its weight.   The natural ventilator according to claim 2, wherein the balancer (25) has a weight (26) and adjusting means for adjusting a distance between the flap (2) and the weight (26).   The natural ventilation device according to any one of claims 1 to 3, wherein the hinge (6) is arranged closer to the opening than the vent (9). The drive unit (3) includes a motor (8), a shaft (12) connected to the output shaft (10) of the motor (8) via the swing allowing means (11), and the shaft (12). ) And the flap (2) to convert the rotation of the shaft (12) into the swing of the flap (2), and a crank mechanism (13).
The swing permitting means (11) is provided at the tip (21) of the output shaft (10) of the motor (8) and protrudes toward the shaft, and the motor-side projection (21a) and the output shaft (10). A shaft-side protrusion (22a) provided at one end (22) of the shaft (12) facing the tip and protruding toward the motor;
The circumferential end surface of the output shaft (10) in the motor side projection (21a) and the circumferential end surface of the shaft (12) in the shaft side projection (22a) can come into contact with each other.
When the flap (2) is driven by the drive unit (3) to close the vent (9), the circumferential end surface of the motor side projection (21a) and the circumferential end surface of the shaft side projection (22a) The flap (2) is driven by the rotational force of the motor (8) being transmitted to the shaft (12) by the contact, and when the vent (9) is opened, the shaft side The flap (2) can be swung by the protrusion (22a) being movable in a direction away from the motor side protrusion (21a). Natural ventilation equipment as described in A stopper (7) that receives the flap (2) and restricts the swing of the flap (2) toward the opening is disposed in the air passage (1).
The natural ventilator according to any one of claims 1 to 5, wherein the stopper (7) has a cushioning material (7a) disposed on the flap side. The flap (2) is arranged in two upper and lower stages with respect to the vent (9),
The natural ventilator according to any one of claims 1 to 6, wherein the upper and lower flaps (2, 2) are interlocked by being connected by a connecting rod (40).