JP2012154032A - Vertical constant-air-volume ventilation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical constant-air-volume ventilation device that dispenses with a member such as a spring for positioning a blade in an opening open position and that enables desired constant-air-volume ventilation to be performed on the inside and outside of a building even when an air current is changed.SOLUTION: A vertical constant-air-volume ventilation device 1 comprises a frame body 3 that is attached to a window frame 2 and elongated in a Z-direction, a blade 5 that is disposed in an opening 4 defined by the frame body 3 and elongated in the Z-direction and that opens/closes the opening 4, opening/closing means 6 for making the blade 5 open/close the opening 4 on the basis of an air current, and an inhibition mechanism 7 that is attached to the frame body 3 and that inhibits opening movement of the opening of the blade 5 by being disengageably engaged with the blade 5 in an opening close position.

Description

  The present invention relates to a vertical constant air volume ventilation device that is installed on a wall, a sash, a vertical wall or the like of a building and ventilates the inside and outside of the building.

  For example, Patent Document 1 proposes a vertical constant air volume ventilation device that elastically holds a blade (air volume adjusting plate) at a desired position by a spring or the like.

JP 2005-273256 A

  By the way, in such a vertical constant air volume ventilation device, since the blade is elastically held at a desired position by a spring or the like, the blade is brought to a desired position based on a state change such as aged deterioration of the spring or the like. It is difficult to hold, and it is difficult to cause the blades to perform a desired operation based on the airflow. In addition, in such a vertical constant air volume ventilation device, it is difficult to simplify the device because a member such as a spring is required.

  The present invention has been made in view of the above points, and the object of the present invention is not to use a member such as a spring for positioning the blades at the opening opening position, even if a change in airflow occurs. An object of the present invention is to provide a vertical constant air volume ventilation device capable of performing a desired constant air volume ventilation inside and outside a building.

  A vertical constant air volume ventilator of the present invention is a vertical constant air volume ventilator provided in a window frame of a building, and is defined by a vertically extending frame body attached to the window frame and the frame body. It is provided with a blade that opens and closes the opening that opens and closes the opening, and an opening and closing means that opens and closes the opening based on the airflow. The opening and closing means can move up and down one part of the blade. And a second support mechanism for supporting the other part of the blade positioned on one side with respect to the one part of the blade in the up-down direction so as to be movable in and out of the building. The other part of the blade is the case where the other part of the blade is positioned below the one part of the blade and the blade is in the open closed position with respect to the center of gravity of the blade. The other part of the wing is against one part of the wing so that it is located outside the building. As it may be even with blades that are located located in a building inside with respect to the center of gravity of the blade when in the open closed position towards, are arranged.

  According to the vertical constant air volume ventilator of the present invention, in particular, the opening / closing means includes a first support mechanism that supports one part of the blades to be movable up and down, and one side in the vertical direction with respect to one part of the blades. And a second support mechanism that supports the other part of the blade movably in and out of the building, and the other part of the blade has the other part of the blade with respect to one part of the blade. The other part of the blade is located on the outside of the building with respect to the center of gravity of the blade when the blade is in the open closed position. When the blade is located at the upper position and the blade is in the closed position, the blade is opened so that it is located inside the building with respect to the center of gravity of the blade. It can be moved, and it is based on an increase in airflow from the outside of the building toward the opening. Therefore, it is possible to cause opening closing movement of the blade against the opening opening moving force based on the weight of the blade, and it is necessary to use a member such as a spring for positioning the blade at the opening opening position. In addition, even if a change in airflow occurs, a desired constant air volume ventilation inside and outside the building can be performed. Further, in such a vertical constant air volume ventilation device, the second support mechanism extends while inclining downward from the inside of the building toward the outside of the building so as to guide and support other parts of the blades from the inside of the building to the outside of the building. The guide support surface may be provided, and in such a case, the opening opening movement of the blade can be caused by guiding and supporting the other part of the blade from the inside of the building to the outside of the building on the guide support surface. Moreover, based on the increase in the air flow from the outside of the building toward the opening, the opening closing movement can be caused in the blade against the opening opening movement generated in the blade as described above. It is not necessary to use a member such as a spring for positioning the door at the opening opening position, and a desired constant air volume ventilation inside and outside the building can be performed even if a change in air flow occurs.

  A vertical constant air volume ventilator according to another aspect of the present invention is a vertical constant air volume ventilator provided in a window frame of a building, and a vertically extending frame body attached to the window frame, and the frame body. And a blade that opens and closes the opening and opens and closes the blade based on the airflow. The opening and closing device is one of the blades. A first support mechanism that supports the part so as to be movable up and down, and a second support mechanism that supports the other part of the blade positioned below the one part of the blade so as to be movable in and out of the building. The second support mechanism includes a guide support surface that extends downwardly from the inside of the building toward the outside of the building so as to guide and support other parts of the blades from the inside of the building to the outside of the building. .

  According to the vertical constant air volume ventilation device of another aspect of the present invention, in particular, the opening / closing means is provided with a first support mechanism that supports one part of the blade so as to be movable up and down, and below the one part of the blade. And a second support mechanism that supports the other part of the blade movably in the direction of the inside and outside of the building. The second support mechanism guides the other part of the blade from the inside of the building to the outside of the building. Since it has a guide support surface that extends downwardly from the inside of the building toward the outside of the building so as to support it, other parts of the blade are guided and supported from the inside of the building to the outside of the building on the guide support surface. The blade can be moved to open the opening, and the opening movement of the blade can be closed against the opening opening movement generated in the blade as described above based on the increase in the air flow from the outside of the building to the opening. And thus the feathers There is no need to use member such as a spring for positioning the mouth open position, even if the change of the air flow occurs may perform desired constant air volume ventilation of the building and out. Further, in such a vertical constant air volume ventilation device of another aspect, the other part of the blade may be located outside the building with respect to the center of gravity of the blade when the blade is in the opening closed position, In such a case, the blade can be opened and moved based on its own weight, and the blade can be moved against the opening and moving force based on its own weight based on the increase in the airflow from the outside of the building toward the opening. Therefore, it is not necessary to use a member such as a spring for positioning the blades at the opening opening position, and even if the air flow changes, the desired constant air volume ventilation inside and outside the building is possible. Can be done.

  Each of the above-described vertical constant air volume ventilation devices of the present invention is provided with a prohibiting mechanism that is attached to the frame body and that releasably engages with the blade at the opening closed position to prohibit the opening opening movement of the blade. Furthermore, you may have.

  According to the present invention, it is not necessary to use a member such as a spring for positioning the blades at the opening opening position, and a vertical constant air volume ventilation device capable of performing a desired constant air volume ventilation inside and outside the building even if a change in air flow occurs. Can provide.

FIG. 1 is a partially omitted side view for explaining an example of an embodiment of the present invention when an opening is closed. FIG. 2 is a partially omitted side view for explaining the example shown in FIG. 1 when the opening is opened. FIG. 3 is a cross-sectional explanatory diagram mainly relating to the first support mechanism in the example shown in FIG. 1. FIG. 4 is a cross-sectional explanatory diagram mainly relating to the second support mechanism of the example shown in FIG. 1. FIG. 5 is an overall explanatory view of the example shown in FIG. 1 as viewed from the inside of the building. FIG. 6 is a partially omitted overall explanatory view of the example shown in FIG. FIGS. 7A and 7B are explanatory diagrams mainly showing the first support mechanism in the example shown in FIG. FIGS. 8A and 8B are explanatory diagrams mainly showing a second support mechanism in the example shown in FIG. FIG. 9 is an explanatory diagram relating to installation on the window frame in the example shown in FIG. 1.

  Next, the present invention will be described in more detail based on an example of a preferred embodiment shown in the drawings. The present invention is not limited to these examples.

  1 to 9, the vertical constant air volume ventilation device 1 of this example provided in the window frame 2 of the building shown in FIG. 9 is attached to the window frame 2 and extends in the Z direction as the vertical direction. A blade 5 that opens and closes the opening 4 and is opened and closed by the blade 5 based on the airflow, and a frame that is disposed in the opening 4 that is defined by the frame 3 and extends in the Z direction. A prohibiting mechanism 7 that is mounted on the body 3 and releasably engages with the blade 5 in the opening closed position to prohibit the opening movement of the blade 5 is provided. The vertical constant air flow ventilation device 1 opens the opening 4 as shown in FIG. 2 by the opening opening movement of the blade 5 toward the outside 8 side of the building, and shows the opening closed movement of the blade 5 toward the inside 9 side of the building as shown in FIG. Thus, the opening 4 is closed.

  FIG. 1 shows a state in which the blade 5 is in the opening closed position, and FIG. 2 shows a state in which the blade 5 is in the opening open position. In FIG. 9, reference numeral 10 denotes a building wall, and reference numeral 11 denotes a shoji made of a glass plate or the like. The window frame 2 has an upper frame 12, a lower frame 13 and a pair of vertical frames 14 and 15 that are connected to each other. The vertical constant air volume ventilation device 1 is installed in the vertical frame 15.

  The frame 3 includes a pair of vertical frames 21 and 22 extending in the Z direction, and an upper lid 23 and a lower lid 24 that connect the vertical frames 21 and 22. A dust-proof net 26 and a cover plate 25 that covers the dust-proof net 26 are attached to the vertical frames 21 and 22 on the side of the building 9. The cover plate 25 is formed with a plurality of holes 27 arranged side by side in the Z direction. The vertical frame 21 is attached to the vertical frame 15 of the window frame 2. A drain pipe 28 is attached to the lower lid 24.

  The blade 5 includes a hollow blade body 41 extending in the Z direction, and an upper lid 42 and a lower lid 43 attached to the upper end and the lower end of the blade body 41, respectively. The blade body 41 is formed with a pair of side edge portions 44 and 45 projecting in the Y direction as a lateral direction perpendicular to the X direction and the Z direction. The side edge portions 44 and 45 are opened by the blade 5. When in the closed position, it is formed to abut against the vertical frames 21 and 22 to close the opening 4.

  The opening / closing means 6 includes a first support mechanism 32 (hereinafter referred to as a support mechanism 32) that supports one portion 31 of the blade 5 so as to be movable up and down, and a blade 5 that is positioned below the portion 31 of the blade 5. A second support mechanism 34 (hereinafter referred to as a support mechanism 34) that supports the other portion 33 movably in the X direction as the inside / outside direction of the building orthogonal to the Z direction is provided. The portion 33 of the blade 5 is located on the outside 8 side of the building 5 with respect to the center of gravity G of the blade 5 when the blade 5 is in the opening closed position shown in FIG.

  The support mechanism 32 is provided on one side 46 and the vertical frame 21 of the blade body 41 and on the other side 47 and the vertical frame 22 of the blade body 41, respectively. Hereinafter, the support mechanism 32 provided on the side surface 46 and the vertical frame 21 of the blade body 41 will be described in detail, and the support mechanism 32 provided on the side surface 47 of the blade body 41 and the vertical frame 22 will be appropriately denoted by a in the drawing. A detailed description thereof will be omitted.

  The support mechanism 32 supports the shaft body 51 so as to be movable up and down so that the shaft body 51 mounted on the portion 31 of the side surface 46 of the blade body 41 and the portion 31 can be raised and lowered with respect to the frame body 3 in the Z direction. And a support member 52. The shaft body 51 may be composed of a rolling roller. The support member 52 is attached to the vertical frame 21.

  The support member 52 is formed with a long hole or slit extending in the direction in which the shaft body 51 is moved up and down, in this example, a long hole 53, and the shaft body 51 is disposed in the long hole 53. The long hole 53 extends obliquely with respect to a vertical line extending in the Z direction so as to extend downward from the inside 9 side toward the outside 8 side of the building. The long hole 53 guides and supports the shaft body 51 in the Z direction during the opening opening movement and the opening closing movement of the blade 5. The shaft body 51 is positioned at the upper end 54 of the long hole 53 when the blade 5 is in the opening closed position shown in FIG. 1, and the lower end of the long hole 53 when the blade 5 is in the opening open position shown in FIG. 55.

  The support mechanisms 34 are provided on the side surface 46 and the vertical frame 21 of the blade body 41 and the side surface 47 and the vertical frame 22 of the blade body 41, respectively. Hereinafter, the support mechanism 34 provided on the side surface 46 of the blade body 41 and the vertical frame 21 will be described in detail, and the support mechanism 34 provided on the side surface 47 of the blade body 41 and the vertical frame 22 will be appropriately denoted by a in the drawing. A detailed description thereof will be omitted.

  The support mechanism 34 includes a shaft 61 mounted on the portion 33 of the side surface 46 of the blade body 41 and the inside of the building 9 so as to guide and support the portion 33 from the inside 9 side of the building to the outside 8 side with respect to the X direction. And a support member 63 formed with a guide support surface 62 that is inclined downward toward the outside 8 side of the building and extends in the X direction. The shaft body 61 may be composed of a rolling roller. The support member 63 is attached to the vertical frame 21. The shaft body 61 attached to the part 33 is disposed so as to be located above the center of gravity G of the blade 5 and on the outside 8 side of the building when the blade 5 is in the opening closed position. The center of gravity G of the shaft body 61 and the blade 5 is located on the same vertical line extending in the Z direction when the blade 5 is in the opening open position.

  The guide support surface 62 includes a surface that defines a long hole 64 formed in the support member 63. The long hole 64 extends obliquely with respect to a horizontal line extending in the X direction so as to extend downward from the inside 9 side toward the outside 8 side of the building, and the guide support surface 62 also extends from the inside 9 side to the building. Inclined with respect to the horizontal line so as to extend downward toward the outer 8 side. The long hole 64 guides and supports the shaft body 61 in the X direction in the opening opening movement and the opening closing movement of the blade 5. When the blade 5 is in the opening closed position shown in FIG. 1, the shaft body 61 is located at the end portion 65 on the 9 side of the long hole 64, and when the blade 5 is in the opening opening position shown in FIG. 2. Is located at the end 66 of the long hole 64 on the outside 8 side of the building. The inclination angle of the guide support surface 62 may gradually increase from the outside 8 side to the inside 9 side of the building. In such a case, the guide support surface 62 is a curved surface.

  When the blade 5 is in the opening open position, the center of gravity G of the blade 5 and the portion 33 are located on the same vertical line extending in the Z direction. The blade 5 in such a stationary state is in a state where the opening can be closed and moved by a small force based on the airflow. Here, when the blade 5 is moved from the opening opening position to the opening closing position based on the air flow, the portion 33 is located on the outside 8 side of the building with respect to the center of gravity G, and the guide support surface 62 is inclined as described above. In addition, the blade 5 is given an opening opening moving force as an anti-moving force against the opening closing moving force. When the opening closing movement force exceeds the opening opening movement force as the anti-movement force, the blade 5 causes the opening closing movement, and the opening closing movement force is larger than the opening opening movement force as the anti-movement force. When it is lower, the blade 5 is moved to open the opening and returns to the opening opening position.

  When the blade 5 is in the opening closed position, the line connecting the portion 33 and the center of gravity G is inclined downward from the outside 8 side toward the inside 9 side of the building with respect to the vertical line. The angle gradually decreases as the blade 5 approaches the opening opening position by the opening opening movement, and becomes 0 degrees when the blade 5 is arranged at the opening opening position. When the line connecting the portion 33 and the center of gravity G is inclined downward from the outside 8 side toward the inside 9 side of the building with respect to the vertical line, the blade 5 has an opening opening moving force based on its own weight. When the inclination angle of the line connecting the part 33 and the center of gravity G with respect to the vertical line is 0 degree, the opening opening moving force in the relationship between the position of the part 33 and the position of the center of gravity G does not occur.

  The prohibiting mechanism 7 includes engaged members 71, 72, and 73 attached to the blade body 41, engaging members 74, 75, and 76 that engage with the engaged members 71, 72, and 73, and an engaging member, respectively. 74, 75, and 76 are attached to the movable member 77 that extends in the Z direction and is supported by the vertical frame 21 so as to be movable in the Z direction, and the casing 78 that is attached to the vertical frames 21 and 22. An operation plate 80 that is movably attached and is connected to a movable member 77 via a link arm 79 is provided.

  The engaged members 71, 72, and 73 are respectively attached to the blade body 41 at intervals in the Z direction, and include shaft portions 81 that are engaged with the engaging members 74, 75, and 76, respectively. The engaging members 74, 75, and 76 are attached to the movable member 77 at intervals in the Z direction, and each has a recess 82 that engages the respective shaft portion 81 of the engaged members 71, 72, and 73. is doing. The recess 82 is open at the upper edge of each of the engagement members 74, 75 and 76.

  The movable member 77 is provided with guide rollers 86 and 87 that are fitted in a groove 85 formed in the vertical frame 21 and extending in the Z direction so as to be movable in the Z direction. It is arranged to move in the Z direction while being guided.

  As shown in FIG. 1, when the engaging members 74, 75, and 76 are engaged with the engaged members 71, 72, and 73, the operation plate 80 extends in the Z direction. 78, and the link arm 79 is also extended in the Z direction.

  When the operation plate 80 is rotated so as to be pulled out toward the inside 9 of the building, the link arm 79 is also rotated and tilted. Accordingly, the movable member 77 moves downward in the Z direction, and the engaging members 74, 75, and 76 attached to the movable member 77 are relatively Z with respect to the engaged members 71, 72, and 73. As shown in FIG. 2, the engaged members 71, 72, and 73 are disengaged by the engaging members 74, 75, and 76, as shown in FIG. As described above, the prohibiting mechanism 7 cancels the prohibition of the opening opening movement of the blade 5 by releasing the engagement of the engaged members 71, 72, and 73 by the engaging members 74, 75, and 76. ing. Further, when the blade 5 is in the opening closed position shown in FIG. 1, if the operation plate 80 is rotated backward so as to be arranged in the Z direction in the housing 78, An upward movement force is applied via the link arm 79, whereby the movable member 77 moves upward in the Z direction, and the engaging members 74, 75 and 76 attached to the movable member 77 are As shown in FIG. 1, the engaged members 71, 72, and 73 move upward in the Z direction relative to the engaged members 71, 72, and 73. And 76 are engaged. As described above, the prohibiting mechanism 7 is configured to prohibit the opening opening movement of the blade 5 by engaging the engaged members 71, 72, and 73 by the engaging members 74, 75, and 76.

  The opening / closing operation of the opening 4 by the vertical constant air volume ventilation device 1 will be described below. First, the opening opening movement of the blade 5 at the opening closed position shown in FIG. 1 is released, and the engagement between the blade 5 and the frame 3 by the prohibiting mechanism 7 is released to allow the opening opening movement of the blade 5. When the opening opening movement of the blade 5 is allowed, the portion 33 is positioned on the outer side 8 with respect to the center of gravity G in the X direction, and the guide support surface 62 is inclined as described above. Is given a turning moment toward the opening opening position, and the blades 5 start opening opening movement. As the shaft body 51 moves toward the outside 8 side of the building 33, the shaft body 51 moves down along the long hole 53 while moving toward the outside 8 side of the building. The rotation moment applied to the blade 5 toward the opening opening position gradually decreases the inclination angle of the line connecting the portion 33 and the center of gravity G with respect to the vertical line as the blade 5 approaches the opening opening position. It becomes smaller gradually. When the blade 5 reaches the opening opening position shown in FIG. 2 by the opening opening movement, each of the portion 33 and the center of gravity G is located on the same vertical line, thereby preventing the opening opening moving force based on the weight of the blade 5 from being generated. Thus, the blade 5 is stationary at the opening open position. Thus, since the rotational moment applied to the blade 5 toward the opening opening position gradually decreases, it is possible to prevent the blade 5 from rapidly opening the opening 4, and conversely, the blade 5 moves from the opening opening position. When the opening closing movement is performed toward the opening closing position, the rotational moment applied to the blade 5 toward the opening opening position is gradually increased. Therefore, the opening opening movement as an anti-moving force against the opening closing movement is provided. As a result of the gradual increase of the force, rapid closing of the opening 4 can be prevented.

  When the blade 5 is in the opening open position shown in FIG. 2, if the outside 8 side of the building becomes positive pressure and the inside 9 side of the building 5 becomes negative pressure with respect to the blade 5, the opening closing movement force based on the air flow is applied to the blade 5. When the blades 5 are closed and moved by the opening closing movement force based on the air flow, the flow rate of the gas flowing between the outside 8 and the inside 9 of the building is reduced. On the other hand, when the air flow causes negative pressure on the outside 8 side of the building and positive pressure on the inside 9 side of the building 5 due to the air flow, the opening opening moving force based on the air flow is applied to the blade 5 and the opening opening moving force based on this air flow. When the blade 5 is moved to open the opening, the flow rate of the gas flowing between the outside 8 and the inside 9 increases. When the opening opening moving force and the opening closing moving force based on the airflow are not generated, the blade 5 returns to the opening opening position as described above and stops.

  According to the vertical constant air volume ventilator 1 of this example, the vertical constant air volume ventilator 1 provided in the window frame 2 of the building, the frame body 3 that is attached to the window frame 2 and extends in the Z direction, A blade 5 that opens and closes the opening 4 is provided in the Z-direction opening 4 defined by the body 3, and an opening and closing means 6 that opens and closes the opening 4 based on the airflow. The opening / closing means 6 moves in the X direction the support mechanism 32 that supports one part 31 of the blade 5 so as to be movable up and down, and the other part 33 of the blade 5 positioned below the one part 31 of the blade 5. The other portion 33 of the blade 5 is located on the outer side 8 side of the center of gravity G of the blade 5 when the blade 5 is in the open closed position. Therefore, the blade 5 can be opened and moved based on its own weight, and it can be opened from the outside 8 side of the building. 4, it is possible to cause the blade 5 to open and close against the opening opening moving force based on the weight of the blade 5, so that the blade 5 is positioned at the opening opening position. There is no need to use a member such as a spring for the purpose, and a desired constant air volume ventilation inside and outside the building can be performed even if a change in airflow occurs. In addition, the vertical constant air volume ventilation device 1 replaces the opening / closing means 6 described above with, for example, one part of the blade 5 so as to be movable up and down with respect to the first support mechanism and one part of the blade 5. A second support mechanism that supports the other part of the blade 5 that is positioned so as to be movable in the X direction. The other part of the blade 5 is configured such that when the blade 5 is in the open closed position, the blade 5 It may be located on the inner side of the building with respect to the center of gravity, and in such a case, the same effect as described above can be obtained.

  According to the vertical constant air volume ventilator 1, the vertical constant air volume ventilator 1 provided in the window frame 2 of the building, the frame 3 extending in the Z direction attached to the window frame 2, and the frame 3 A blade 5 for opening and closing the opening 4 and opening / closing means 6 for opening and closing the opening 4 based on the airflow; 6 is a support mechanism 32 that supports one part 31 of the blade 5 so as to be movable up and down, and another part 33 of the blade 5 that is positioned below the one part 31 of the blade 5 so as to be movable in the X direction. The support mechanism 34 is directed from the inside 9 side of the building toward the outside 8 side so as to guide and support the other part 33 of the blade 5 from the inside 9 side to the outside 8 side of the building. Since the guide support surface 62 is inclined and extended downward, another portion 33 of the blade 5 is proposed. By supporting the support surface 62 from the inside 9 side of the building to the outside 8 side of the building, the blade 5 can be moved to open the opening, and moreover, based on the increase in the air flow from the outside 8 side to the opening 4, As described above, an opening closing movement can be caused in the blade 5 against the opening opening movement generated in the blade 5, and thus a member such as a spring for positioning the blade 5 in the opening opening position. It is not necessary to use, and even if a change in the air flow occurs, a desired constant air volume ventilation inside and outside the building can be performed.

DESCRIPTION OF SYMBOLS 1 Ventilation device 2 Window frame 3 Frame body 4 Opening 5 Blade 6 Opening / closing means 7 Prohibition mechanism 8 Outside building 9 Inside 32, 34 Support mechanism 62 Guide support surface

Claims (5)

  A vertical constant airflow ventilation device provided in a window frame of a building, which is disposed in a vertically extending frame body mounted on the window frame and an vertically extending opening defined by the frame body A blade that opens and closes the opening; and an opening and closing means that causes the blade to open and close based on an air current. The opening and closing means includes a first support mechanism that supports one part of the blade so as to be movable up and down; And a second support mechanism for supporting the other part of the blade located on one side with respect to the vertical direction so as to be movable in and out of the building. When the other part of the blade is located below the one part of the blade and the blade is in the open closed position, the blade When the other part is located above one part of the blade As when the root is at the opening closed position is located in a building inside with respect to the center of gravity of the blades are arranged vertical constant air volume ventilator.   2. The second support mechanism includes a guide support surface that extends downwardly from the inside of the building toward the outside of the building so as to guide and support other parts of the blades from the inside of the building to the outside of the building. The vertical constant air volume ventilation device described in 1.   A vertical constant airflow ventilation device provided in a window frame of a building, which is disposed in a vertically extending frame body mounted on the window frame and an vertically extending opening defined by the frame body A blade that opens and closes the opening; and an opening and closing means that causes the blade to open and close based on an air current. The opening and closing means includes a first support mechanism that supports one part of the blade so as to be movable up and down; A second support mechanism that supports the other part of the blade positioned below the one part so as to be movable in and out of the building, and the second support mechanism includes the other part of the blade. A vertical constant air volume ventilation device comprising a guide support surface that is inclined and extended downward from the inside of the building toward the outside of the building so as to be guided and supported from the inside of the building to the outside of the building.   The vertical constant air volume ventilation device according to claim 3, wherein the other part of the blade is located outside the building with respect to the center of gravity of the blade when the blade is in the opening closed position.   5. The apparatus according to claim 1, further comprising: a prohibiting mechanism that is mounted on the frame body and that releasably engages with the blade in the opening closed position to prohibit opening movement of the blade. The vertical constant air volume ventilation device described.

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