JP2009133526A - Ventilation tower utilizing natural ventilation system and air guide device for natural ventilation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a natural ventilation system and an air capturing device with a wind direction switching function, using a ventilation tower erected from a building as both an exhaust duct and an air supply duct to be properly used for exhaust and air supply according to a weather condition, whereby the utilization of natural ventilation is increased. <P>SOLUTION: In this natural ventilation system, a gravity ventilation action using a difference in the density of air between upper and lower ends of the ventilation tower 4 erected from the building with a ventilating opening 2 is utilized to discharge air in the building from the ventilation tower and also supply the air from the ventilating opening. The air capturing device 6 including a wind direction switching function is attached to the upper end of the ventilation tower 4. The air capturing device includes an air passage opened in the lateral direction, wherein the midway of the air passage faces the upper end opening of the ventilation tower 4, a flank wind passes through the air passage in a first mode where wind speed is lower than a reference speed, and the flank wind is captured and pushed into the ventilation tower in a second mode where the wind speed is higher than the reference speed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a natural ventilation system using a ventilation tower and an air guide device for the natural ventilation system.

  In addition, the natural ventilation system in this specification means the system which can mainly ventilate natural force. This system does not exclude those that can be used in combination with mechanical ventilation or those that use an auxiliary power source to change the operation mode.

  In recent years, the natural ventilation method has attracted attention due to the demand for energy saving. As this method, there are wind ventilation using external wind pressure and gravity ventilation using gravity action due to the difference in air density.

  As a wind ventilation system, the upper part of the rotatable inverted L-shaped ventilation pipe protrudes above the ground, and fins are attached to make the tip opening of the ventilation pipe face upwind, and the lower end of this pipe is used as an underground pit. What was made to communicate is known (patent document 1).

  Some gravity ventilation systems utilize differences in air density due to solar heat or waste heat generated inside buildings. In particular, the one that warms the vertical exhaust path with solar heat and generates an updraft due to the chimney effect is called "solar chimney".

  For example, on the south side of a high-rise building, a vertical shaft (solar chimney) that communicates with each floor is installed vertically, and when the vertical shaft is heated by solar radiation, an upward air flow is generated in the vertical shaft, and the air in each floor is sucked up and vertical One that exhausts from the upper end of the shaft is known (Patent Document 2).

    In order to evaluate the ventilation performance of a solar chimney installed vertically on one side of such a building, in Non-Patent Document 1, an experiment was conducted on the route from outside the university building to the classroom to the lounge to the solar chimney to the outside. As a result, the temperature difference between the inside and outside of the chimney was as large as 4.6 to 20.4 ° C. in the intermediate and winter seasons, and it was observed that there was a proportional relationship between the inside / outside temperature difference and the air flow rate at the top of the chimney.

Furthermore, what utilizes a chimney effect and the attraction effect by an external wind is also proposed (patent document 3). In this structure, an air supply duct is provided on a side wall of a low-rise building, and a ventilation tower type exhaust duct is raised up from the ceiling of the building to increase the attraction effect. In general, the wind speed of the external wind increases as it goes up due to the frictional force between the ground and the atmosphere, and the static pressure of the air decreases as the speed increases from the law of conservation of energy. This is because a negative pressure corresponding to the wind speed is generated at the upper end of the duct, and an effect of pulling up air is produced. Further, in the system of Patent Document 3, a cross-shaped ventilation path that opens to the front, rear, left and right is provided at the upper end of the exhaust duct in order to effectively draw out the airflow attraction effect, and a backflow prevention damper is provided near each opening surface. In which the cross wind passes in the front-rear direction or the left-right direction directly above the opening of the exhaust duct (see FIG. 2 of the same document).
JP 10-339486 A JP 2000-213184 A JP 2003-83575 A "Study on equipment system of environmentally friendly university buildings mainly made up of solar chimneys (4th report) Chimney measurement and evaluation of natural ventilation in the middle and winter season" Akiko Maesaka 1409-1412 2006.09.27-29

  Since the natural ventilation system uses unstable natural force, compared to mechanical ventilation that can use a stable energy source such as electricity, the aspect of leaving the ventilation is likely to be stronger. Overcoming such drawbacks, increasing the reliability and stability of the ventilation system and improving its practicality has become a major issue. In that respect, the above-mentioned system of Patent Document 3 combines the chimney effect and the attraction effect by the external wind, so that the application range of the system is extended to the time of a light wind where sufficient ventilation performance cannot be obtained conventionally. Expected.

  However, in a natural ventilation system in which a chimney-shaped ventilation tower stands up high, the external wind may blow into the ventilation tower depending on weather conditions such as the direction and speed of the external wind.

  In particular, due to the location of the building and planning restrictions, in the main wind direction where the external wind appears frequently, negative pressure is generated on the leeward side of the ventilation opening (normal air supply opening) of the room subject to ventilation, that is, the negative side pressure. In the case where it can be ensured only on the side where the air flows, the phenomenon of air flowing back from the upper end of the ventilation tower to the ventilation opening as described above has occurred remarkably. This is because when the wind is strong, the air flow around the building becomes unstable, and the negative pressure at the air supply port on the outer wall of the building temporarily and intermittently becomes higher than the negative pressure at the exhaust port at the top of the ventilation tower. It is thought that this is because it sometimes happens.

    As described above, the phenomenon in which air flows backward in the ventilation tower does not always occur. Therefore, in the past, it was left to the event, or the damper provided in the ventilation tower was closed and natural ventilation was performed. The system was planned to stop and switch to mechanical ventilation. However, these system plans also have various drawbacks as described below.

  Therefore, the present invention uses the ventilation tower standing up from the building as an exhaust duct and an air supply duct so that it can be used for exhaust and air supply according to weather conditions, thereby reducing the utilization rate of natural ventilation. It is an object of the present invention to provide a natural ventilation system that is enhanced and an air guide device that is suitable for this system.

The first means is to exhaust the air in the building from the ventilation tower and supply it from the ventilation opening by using the gravity ventilation effect due to the difference in the air density between the upper and lower ends of the ventilation tower 4 standing from the building with the ventilation opening 2. In a natural ventilation system that can mind,
At the upper end of the ventilation tower 4, a wind guide device 6 serving as an exhaust port and an intake port is attached.
This wind guide device includes an air passage that opens in the lateral direction, and an intermediate portion of the air passage is made to face the upper end opening of the ventilation tower 4 so that the cross wind is in the first mode in which the wind speed is less than the reference speed. In the second mode where the wind speed is higher than the reference speed, the cross wind is captured and pushed into the ventilation tower.
Switching between the first mode and the second mode of the wind guide device can be performed by mechanical power or wind power.
Further, in the second mode, by setting the pushing force of the side wind by the wind guide device 6 to be greater than at least the gravity ventilation action, it is possible to supply outside air to the building through the ventilation tower 4. Yes.

  In this means, the standing tower of the building is selectively used as an exhaust duct below the reference wind speed and as an air supply duct above the reference wind speed. For this purpose, a wind guide device is provided at the upper end of the ventilation tower so as to push the cross wind into the ventilation tower when the wind speed is higher than the reference speed.

  Even without such a wind guide device, when the wind speed increases to some extent, the phenomenon of a reverse flow from the exhaust port at the top of the ventilation tower to the air supply port at the appropriate location of the building occurs naturally. This is because, for example, an unstable air flow called a building wind is generated around the building, thereby generating a temporary negative pressure near the air supply port. However, since such negative pressure is unstable, if it is left to nature, there is a risk that the wind direction will change rapidly in the forward and reverse directions inside the ventilation tower. Then, the same air just goes up and down in the ventilation tower, so the air in the ventilation target room is not easily discharged to the outside, and the ventilation air volume per unit time is significantly reduced. That is, the negative pressure generated naturally around the building is not suitable as a power source for high-quality ventilation.

  For this reason, in a weather environment that causes natural backflow, it is normal to switch natural ventilation to mechanical ventilation as described above. However, switching to mechanical ventilation not only requires extra energy, but in the first place. There is a problem that it is not easy to incorporate a condition of a randomly generated backflow into the algorithm. It is relatively easy to empirically or experimentally grasp the general tendency that backflow is likely to occur when the wind speed exceeds a certain speed. In view of this, the present applicant has proposed the present means in which, instead of avoiding the natural backflow, the backflow is artificially caused in the ventilation tower when the wind speed exceeds the reference speed.

The condition for causing the backflow is “the pushing force of the cross wind by the wind guide device is at least larger than the gravity ventilation action”. First, the height of the ventilation tower is H, the wind speed (reference speed) at the time of switching the wind direction is V, g is the gravitational acceleration, and ρ is the air density. If air guiding device without loss of crosswind momentum at all kinetic energy, when it is possible to switch downwards, pushing force by the baffle device (pressure) P _D is equal to crosswind dynamic pressure, (ρ / 2) V ² . In reality, since there is a loss of kinetic energy, the loss coefficient is λ (0 <λ <1). The gravity ventilation action is ρgH. Therefore, the required condition is
[Formula 1] λ (ρ / 2) V ² > ρgH
λ is a numerical value depending on the shape of the wind guide device, and may be set experimentally. Further, when the negative pressure generated in the vicinity of the air inlet of the building is ΔP (<0) and the loss when passing through the ventilation tower is _HL , the above Equation 1 is more accurately expressed as the following equation.
[Formula 2] λ (ρ / 2) V ² > ρg (H + H _L ) + ΔP
Here, the “ventilation tower” refers to one that stands up from at least the upper part of the building, but the lower part of the ventilation tower may be extended to the lower floor of the building to form a vertical shaft.

  The “reference speed” can be set as appropriate so that the ventilation efficiency is increased. If the wind speed exceeds a certain level, the air around the building becomes unstable, and a strong negative pressure may be generated near the ventilation opening, causing air to flow from the ventilation tower to the ventilation opening. Good.

  The “ventilation tower” has a function of exhausting the air inside the building by the chimney effect and a function of supplying the air above the building captured by the wind guide device into the building. When the wind passes around the building, a separation region S is generated around the building, and the pressure is reduced in this region. Therefore, if there is a wind guide device in the area, the pushing force of the air will be reduced. Therefore, it is desirable that the ventilation tower protrude above the separation area at the upper limit of the wind speed at which natural ventilation is performed. The extent to which the separation region (negative pressure region) is generated at what wind speed can be understood by performing a cavity experiment, for example. Further, since the speed of the external wind is proportional to the square root of the height from the ground, the pushing force of the air in the wind guide device is improved as the height of the ventilation tower is increased. On the other hand, since the friction with the inner surface of the ventilation tower increases as the length of the ventilation tower increases, it is desirable to balance the two.

  When using a ventilation tower as an air supply path, the “air guide device” can capture external wind flowing through free space and force it into the ventilation tower. When using the ventilation tower as an exhaust path, It is a device having a function of simply allowing the wind to pass therethrough. The air guide device has an air passage that opens in the lateral direction, and in order to have an attraction effect in the exhaust mode, the air passage must be substantially straight (wind passage) in the lateral direction. desirable. However, this is not necessarily so.

  There are various types of wind guide devices. For example, in terms of the power of the wind guide device, it may be either a passive type that moves by wind force or an automatic type that moves by mechanical force. Further, as a structure of the wind receiving surface of the wind guide device, a wind direction switching damper may be provided inside the wind passage as a wind receiving body, but the wind receiving body is a part of a wall that defines the wind passage. By moving this part, the wind may pass through the wind path or the wind direction may be changed to the ventilation tower side.

The second means is provided so that it can be attached to the upper end of the ventilation tower of the building,
Including an airway that opens laterally,
In the first mode in which the wind speed is less than the reference speed with the middle part of the wind path facing the upper end opening of the ventilation tower, the second mode in which the cross wind passes through the wind path and the wind speed is higher than the reference speed. It is a wind guide device having a wind trapping action, which is provided so as to capture the cross wind and push it into the ventilation tower,
The above airway extends almost straight in the lateral direction,
The wind guide portion 18 for guiding the cross wind to the ventilation tower is composed of a pair of air flow guide plates 20 that face each other to define the air passage 22 and a wind receiving body 24 that is located between these air flow guide plates at least in the second mode. And
The wind receiving body 24 is provided so that it can move between a first position where the cross wind can blow through the wind path 22 horizontally and a second position where the wind path 22 is blocked to receive the cross wind. .

  This means is a wind guide device having a wind trapping action for the above-described natural ventilation system using a ventilation tower. In general, it is well known to provide a damper for switching the flow path at a branch point in the middle of the flow path. However, the wind guide device (wind catcher) of this means is attached to the end of the exhaust passage, which is a ventilation tower, and captures the wind flowing horizontally in the free space outside at a certain wind speed and the captured wind. It has a function of pushing into the ventilation tower, which is a space surrounded by the power against the transport power (gravity action), and is different from a simple wind direction switching device in that respect.

  “Attached to the upper end of the ventilation tower of the building” means that it is sufficient that the main body of the air guiding device including at least the air guiding portion is attached to the upper end of the ventilation tower. For example, the operation of the device is controlled as described later. A control unit may be installed on the ground.

  The “air guide section” has a function of capturing a cross wind and pumping it into the ventilation tower in the second mode, and a function of guiding it so as to pass over the ventilation tower in the first mode. For the former function, for example, a pair of left and right airflow guide plates and a wind receiving body that divides the upper side of the air passage receive the total pressure of the cross wind (dynamic pressure + static pressure) in the wind guide section and enter the ventilation tower. It is comprised so that it may convert into the pushing force of.

  The “wind receiving body” has a function of blocking the end of cross wind in the second mode and changing the wind direction toward the ventilation tower. The wind receiver has various shapes such as a seesaw type and a shutter type, which will be described later. The movement of the passive member between the first and second positions includes not only moving on a straight line or a curved line but also moving between two directions (rotation positions) around the axis. The material of the wind receiving body must be strong enough to withstand the wind pressure applied during strong winds such as typhoons, and it has excellent weather resistance when used in situations where it is exposed to sunlight or rain outdoors. It is preferable to do. Specific examples include metal materials having excellent (corrosion) corrosion resistance such as aluminum, stainless steel, and titanium, and carbon fiber reinforced resins.

  The “airflow guide plate” is disposed facing the side of the wind receiving body, and has a function of guiding the air flow to the ventilation tower side so that the wind colliding with the wind receiving body does not escape to the side.

  The “wind path” is a path for the external wind, and preferably has a shape that does not impair the natural momentum of the wind. In particular, those extending substantially straight in the lateral direction are suitable. However, even if a portion of the passage is bent, the bending angle may be an obtuse angle of 135 ° or more. Moreover, the cross-sectional area of the passage may be gradually reduced to generate a contracted flow, but an air passage having a shape that intentionally bypasses air is not included.

  The third means includes the second means, and the wind receiving body 24 is configured to move between the first position and the second position by wind power.

  In this means, an energy-saving ventilation system is provided by switching the position of the wind receiving body with wind power.

  Specifically, the wind receiving surface of a part of the wind receiving body is designed to convert the wind pressure of the cross wind into a propulsive force, and resists restoring force such as gravity when the wind speed reaches a certain level or more. The first position may be moved to the second position, and when the wind pressure becomes less than a certain value, the restoring force may be used to return to the original position. In order to realize the restoring force, an elastic body such as rubber or a spring may be used. The first mode of exhausting through the ventilation tower and the supply of air through the ventilation tower by providing a resistance mechanism that resists the movement of the passive member from the first position using elastic force or viscous force Switching to the second mode can be performed accurately.

  As a passive type passive member, a member in which a blade-like plate rotates around wind pressure around a horizontal axis and returns by its own weight + elastic force is given as a preferred example. However, the scope of the present invention is not limited to this. For example, the invention can be applied to one that rotates around the horizontal axis and returns by elastic force, or one that rises by lift using a lift wing and falls by gravity. It is possible.

The fourth means includes the second means, and the wind guide device body 6a including at least the wind guide portion 18 and the drive portion 34 for moving the wind receiving body 24 of the wind guide portion is provided as a ventilation tower. 4 is configured to be attachable to the upper end of the control unit 4 and is connected to the control unit 38 for controlling the drive unit, and a sensor unit 36 for measuring the wind speed or air pressure around the building or the ventilation tower. And
The drive unit is controlled so that the wind receiving body 24 moves between the first position and the second position in accordance with the wind speed or air pressure measured by the sensor unit.

  In this means, the position of the wind receiving body is controlled by mechanical force, whereby stable operation characteristics can be obtained. For example, when the position is controlled by wind power as described above, the wind receiving body frequently moves between the first and second positions when the wind speed changes irregularly near the reference speed, and the wind receiving body. May result in poor ventilation or poor ventilation efficiency. However, when performing position control with a machine, an appropriate operation can be obtained by devising a control cycle. In addition, what enabled it to switch the automatic mode by mechanical force and the passive mode by wind force is also contained in the range of this means.

  The “sensor unit” may be a wind speed sensor (including a wind direction / wind speed sensor) or a pressure sensor. The wind speed sensor is preferably attached to the upper part of the ventilation tower, but may be installed near the ventilation opening. The pressure sensor can be a differential pressure sensor. As a method of using this differential pressure sensor, it may be used instead of the wind speed sensor, but instead of the wind speed sensor or together with the wind speed sensor, a pressure sensor for measuring the pressure difference between the upper part of the ventilation tower and the vicinity of the ventilation opening is used. The first and second modes may be switched by providing the output.

The fifth means includes any one of the second means to the fourth means, and the wind receiving body 24 rotates around the support shaft 28 so that the first position and the second position are obtained. Are formed by vanes 26 that can move between the two.

  In this means, the wind receiving body 24 is provided so as to be able to move between the first and second positions around the support shaft by rotating. The advantage of this configuration is that it is easy to design the wind receiver. Since this wind guide device is installed in a narrow place at the upper end of the ventilation tower, it is possible to move between the first and second positions just by changing the direction of the wind receiver around the spindle above the ventilation tower. Such a structure is convenient in design. Moreover, since the apparent area (finding area) seen from the wind upstream will increase once the slat which is a wind receiving body will be in an inclined state, the wind pressure received from a cross wind will increase by shifting from a horizontal state to an inclined state. This means that even if the wind in the natural world increases or decreases near the reference speed, once it is in a tilted state, the state is stably maintained, preventing unstable operations such as chattering. can do.

  The “blade” has a function of adjusting the wind direction by turning according to the wind speed, and includes a first mode (or position) with a small inclination with respect to the horizontal direction and a second mode (or position) with a large inclination. It can be formed as a plate material that rotates between them. Here, the small inclination includes both the case where the inclination is zero and the case where only a part (for example, the front part) of the blade is inclined. As the rotational force, mechanical force may be used, but wind pressure received from the cross wind by the inclined portion of the blade may be used. In this specification, “rotation” refers to a movement designed mainly to return to the opposite direction after turning in one direction, but can continue to rotate only in one direction. It does not mean to eliminate.

The sixth means has fifth means, and the pair of airflow guide plates 20 are installed vertically and in parallel so that they can be arranged on both sides of the opening of the ventilation tower 4,
The wind receiving body 24 has both the front and back surfaces of a blade 26 that is long in the direction of the wind path 22 facing up and down, and supports an intermediate portion of the blade on a horizontal support shaft 28 so that the wind path 22 can enter the wind path 22 from one direction. When the cross wind is blown, the other end of the blade plate 26 shields the air passage portion on the other edge side of the opening of the ventilation tower 4, and when the cross wind is blown into the air passage 22 from the other direction, the blade plate 26 is formed so as to shield the air passage portion on the other edge side of the opening of the ventilation tower 4.

  In this means, the wind can be sent into the ventilation tower regardless of which side of the wind path is blown by the rotation of the blades.

The seventh means has the sixth means, and the vane plate 26 is installed at the opening of the ventilation tower by curving from the middle part in a horizontal state and projecting the free end part upward and outward. In this state, the flow path width of the air passage 22 between the upper end surface of the opening and the back surface of the blade plate 26 is formed so as to be narrowed at the intermediate portion of the blade plate 26.

The eighth means includes the fourth means, and the pair of airflow guide plates 20 that define the air passage 22 are erected from both sides of the substrate 10, and the top plate 40 is disposed between the upper portions of the airflow guide plates. Sideways,
In the intermediate portion 22c excluding both ends 22a and 22b of the air passage 22, the substrate 10 is provided with a communication hole 12 with the inside of the ventilation tower,
A support shaft 28 crossing above the communication hole is installed between the airflow guide plates 20 and 20,
A wind receiving body 24 formed by projecting a closing plate 48 from the support shaft via a connecting piece 46 is provided so as to be rotatable around the support shaft.
The closing plate 48 is configured to sequentially close one end portion 22a of the air passage 22, close the communication hole 12, or close the other end portion 22b of the air passage 22 by rotation around the support shaft 28. ,
Further, recess recesses 44, 45 are provided in one or both of the upper surface of the substrate intermediate portion including the upper opening of the communication hole 12 and the lower surface of the corresponding top plate portion,
The closing plate 48 can be accommodated in the retracting recesses 44 and 45 by turning around the support shaft 28.

  In this means, a blocking plate that rotates around the support shaft is made to wait in the recess in the first mode, and one end or the other end of the air passage can be blocked in the second mode. In this case, the communication hole continuous with the ventilation tower can be closed.

  The “blocking plate” has a function of blocking each end of the air passage and the communication hole, and may have any shape as long as this function is ensured. However, as a preferable example, if the outer surface of the closing plate has an arc shape centered on the support shaft, and the corresponding recess and communication hole viewed from the side of the air passage have an arc shape, the opening and closing operation is smooth. Can be done. In addition, when the inner surface of the closing plate is designed to be flush with the inner surface of the air passage when the communication hole is closed or accommodated in the recess, the resistance of the cross wind passing through the air passage can be reduced. Good and good. In this specification, “rotation” is used to mean both of continuing in one direction and returning to the original direction in one direction.

Ninth means has fourth means, and the wind receiving body 24 spans between a pair of guide rails 50 and serves as a shutter including a plurality of strip plates 52 connected to each other. It is configured to linearly move between the first position and the second position along the rail 50.

  In this means, a wind guide device including a shutter type wind receiving body is proposed. In this configuration, by appropriately designing the shape of the guide rail, the shape of the wind receiving body can be determined so as to efficiently push the cross wind into the ventilation tower.

According to the first aspect of the invention, by attaching the air guide device 6 to the upper end of the ventilation tower, gravity ventilation can be performed using the ventilation tower as an exhaust path when the wind is weak, and ventilation is performed when the wind is strong. Pressure ventilation using wind pressure can be performed using the tower as an air supply path, and the range of natural ventilation can be expanded by combining two types of ventilation systems.

The invention according to the second means has the following effects.
Since the wind guide portion 18 of the wind guide device is formed by the pair of airflow guide plates 20 facing each other and the wind receiving body 24 that can move between the airflow guide plates, a pair of airflow guide plates is used for the cross wind in the second mode. 20 and the wind receiving body 24 can be reliably caught and pushed into the ventilation tower, and the efficiency of pressure ventilation can be improved.
○ Since the wind path is set straight sideways, the wind force of the cross wind is not cut, and the attractive effect of raising the air in the building in the first mode can be expected.

  According to the third aspect of the invention, since the wind receiving body 24 is operated by wind power, no energy is required to control its movement.

  According to the fourth aspect of the invention, since the position of the wind receiving body is switched by the output of the sensor unit 36, a stable operation can be obtained.

The invention according to the fifth means has the following effects.
○ Since the wind receiving body 24 is a rotary vane, it may be formed so as to change the inclination of the wind receiving body so as to open and close the air passage above the ventilation tower, and the space for drawing the wind receiving body in the first position. Therefore, the structure of the apparatus is simplified.
○ Once the vane that is the wind receiving body is in an inclined state, the apparent area seen from the direction of the wind (finding area) increases, so that the inclined state can be maintained firmly, and stable operation is guaranteed.

  According to the sixth aspect of the invention, since the wind receiving body 24 supports the middle portion of the blade 26 that is long in the direction of the wind path 22, it catches the wind regardless of which side the wind path blows. Can be pushed into the ventilation tower 4 and is efficient.

  According to the seventh aspect of the invention, the flow passage width of the air passage 22 is narrowed at the intermediate portion by making the blade plate 26 curved from the intermediate portion and projecting the free end portion upward and outward. Thus, in the first mode, negative pressure is generated due to an increase in the wind speed in the middle portion of the air passage 22, and the air in the ventilation tower 4 is pulled up. Thus, the action of pressure ventilation by negative pressure in the gravity ventilation mode. Can be added, and ventilation efficiency can be improved.

The invention according to the eighth means has the following effects.
O For example, in the case of storm, the communication hole 12 is closed by the closing plate 48, so that it is possible to prevent wind and rain from blowing into the ventilation tower 4 from the communication hole.
In the first mode in which the cross wind passes through the air passage 22, the closing plate 48 is accommodated in the retracting recesses 44 and 45, so that the closing plate is incorporated in a compact manner without complicating the structure of the air guide device. In addition, even if strong wind blows in the first mode, the closing plate is retracted into the recess in advance, so that it is possible to prevent the support shaft from being damaged or the closing plate from being blown off.

  According to the ninth aspect of the invention, since the wind receiving body 24 is a shutter type bridged between the pair of guide rails 50, the wind can be efficiently captured and pushed into the ventilation tower. In addition, it is easy to design a shape viewed from the side.

  FIGS. 1-7 has shown the natural ventilation system which concerns on the 1st Embodiment of this invention, and the wind guide apparatus utilized for this system. This system includes a ventilation port 2, a ventilation tower 4, and a wind guide device 6. The wind guide device of the present embodiment is a passive type that moves using wind power, and an automatic type will be described in a later embodiment.

  The ventilation port 2 is formed in the outer wall of each floor of the building B. A bidirectional air volume adjustment damper can be provided in the ventilation opening.

  The ventilation tower 4 is a cylindrical (or chimney-like) structure that stands up above the building B. The lower part extends downward to form a vertical shaft integrated with the building. The illustrated ventilation tower is cylindrical when viewed from above, but may be formed in a polygonal cylinder such as a quadrangle.

  The air guide device 6 is attached to the upper end of the ventilation tower 4. The passive type air guide device includes at least a base portion 8 and an air guide portion 18.

  The base 8 has a substrate 10 and a mounting cylinder 16. The substrate 10 has a communication hole 12 having a size similar to that of the cylinder hole of the ventilation tower at the center, and the mounting cylinder 16 is suspended from the back surface of the substrate portion around the communication hole.

  Both the front and rear ends 14 of the substrate 10 are used as receiving portions that come into contact with the lower surface of a blade plate described later to lock the blade plate. In the illustrated example, the overall shape of the substrate viewed from above is substantially circular corresponding to the shape of the opening of the ventilation tower, and both the left and right edges of the front and rear edges of the substrate are extended in the front-rear direction. The front and rear ends of 10a are linear, and the blades are pointed at the entire end.

    The upper end portion of the mounting cylinder 16 is connected to the back surface of the substrate portion around the communication hole. The mounting cylinder is fitted and fixed to the upper end portion of the outer surface of the cylinder wall of the ventilation tower 4. Aside from the mounting cylinder, an auxiliary cylinder fitted into the inside of the ventilation tower from the back side of the substrate may be suspended, and the auxiliary cylinder and the mounting cylinder may be firmly fixed to the ventilation tower.

  The air guide 18 is formed by a pair of airflow guide plates 20 and a wind receiving body 24.

    Each airflow guide plate 20 stands up and faces each other from the left and right side portions of the communication hole 12 in the substrate 10 so as to face each other. A bearing hole 21 is formed at an appropriate position (upper part in the illustrated example) of each airflow guide plate 20. As shown in FIG. 3, the front and rear edges of the airflow guide plate 20 extend from the front to the rear of the communication hole 12, and a wind passage, that is, an airway 22 is formed between the airflow guide plates. .

    In the first mode, the wind receiver 24 stands by at a position where it does not disturb the airflow passing through the wind path in the front-rear direction, and in the second mode, the wind receiver 24 is configured to partition the leeward side of the wind path. In the illustrated example, a support shaft 28 is provided between the bearing holes 21 of each airflow guide plate 20, and a wind receiving body 24 is formed by a blade plate 26 pivotally attached to the support shaft. As shown in FIG. 2, this blade is curved from the front to the top and from the rear as viewed from the side, and is formed so that the side wind turns from the side to the front and back of both front and rear portions of the blade. . Further, a resistance mechanism 30 is provided between the blade plate and the airflow guide plate to generate resistance on the side opposite to the rotational force. When the wind speed is below the reference wind speed by setting the magnitude of the resistance force, the blade plate 26 is installed. It is configured to maintain. In the illustrated example, the resistance mechanism is a spring-shaped coil spring, and the inner end of the spring is engaged with a support shaft 28 projecting outward from the bearing hole 21, and the outer end of the spring is connected to the airflow guide plate 20. It is fixed to the outer surface. However, the configuration of the resistance mechanism can be changed as appropriate.

  In the example shown in the figure, the building B continues from the vertical shaft 5 below the ventilation tower 4 to the ventilation target room R via the corridor C, and the ventilation opening 2 is formed in the ventilation target room. However, the corridor may be omitted, the vertical shaft 5 and the ventilation target room R may be adjacent to each other, and these may be communicated with each other through an opening or a ventilation duct.

FIG. 4 is a diagram for explaining the design of the conditions under which the blades start to rotate. Since the calculation is complicated in the circular arc shape as shown in FIG. 2, a laterally U-shaped model rotating body as shown in FIG. 5A is used instead. The horizontal width of the horizontal plate portion of the rotating body is 2 L (m), and the x axis is perpendicular to the end E of the horizontal plate. The height of the vertical plate portion of the rotating body is Ltanθ (= x ₀ ). The depth of the rotating body is w (m), and the weight per unit area is m (kg / m ² ). Further, the wind speed of the cross wind that strikes the rotating body is v (m / s), the moment acting on the rotating body around the axis by this wind is M (Nm), and the air density is ρ. In a windless horizontal state, the horizontal plate portion of the rotating body is not exposed to a crosswind, so the contribution to the moment is zero. The formula for the moment acting on the blade is as follows.
[Formula 3] M = mLtanθwgL−mLtanθwgL = 0
Assuming that the resistance moment of the above-described resistance mechanism is R, and an external wind having a wind speed v (0 <v <v ₁ ) blows, the moment acting on the blade body is as follows. Where c is a wind pressure coefficient and α is a rotation angle.
[Formula 4] M = ∫ ^Ltanθ ₀ (cρ / 2) v ² gdL × wL + mLtanθwgL−mLtanθwgL−R
Furthermore, when the wind speed becomes v> v ₁ ,
[Formula 5] M = ^∫Ltanθ ₀ (cρ / 2) × (v · cos α) ² × dLwL−R ′ = ^∫Ltanθ ₀ (cρ / 2) × (v · cosα) ² × wL × dL−R ′
However, R 'is the resistance moment at the time of rotation.

FIG. 5 shows the relationship between the restoring force F of the slats and the wind speed v. As shown in the figure, the range of the wind speed from 0 to v ₁ corresponds to the first mode of exhausting through the ventilation tower. In this mode, the hook law is established for the spring of the resistance mechanism 30. Yes. However, when the wind speed exceeds v ₁ , the vane plate 26 suddenly rotates, so that the amount of deformation of the spring also increases so that it falls outside the range in which Hook's law holds. As a result, the resistance force, that is, the restoring force of the spring rapidly decreases and becomes constant thereafter.

  FIG. 6 is a diagram showing the relationship between the ventilation volume and the wind speed in this system under certain conditions. A thin solid line indicates an exhaust mode, and a thick solid line indicates an air supply mode. A thick dotted line is obtained by inverting a thick solid line around the axis for comparison. According to this, it can be seen that the two lines intersect at around the wind speed of 2.5 m / s. Thus, the ventilation capacity can be improved if the exhaust mode is set at 2.5 m / s or less and the supply mode is set at more than that.

These lines are calculated as follows. First, the ventilation (exhaust) flow rate is given by Equation 6 below.
[Formula 6] Q = αA × [| 2 {1- (To / Tc)} gH + (Cw−Cc) V ² |] ^0.5
However, Cw is the wind pressure coefficient in the window of the living room, Cc is the wind pressure coefficient of the top of the chimney, To is the outside air temperature (K), and Tc is the temperature (K) inside the chimney. Note that the calculation is performed with Cw = −0.4 and Cc = −0.6.

The amount of ventilation (supply air) is given by the following equation (7).
[Formula 7] Q = −αA × [| 2 {1- (To / Tc)} gH + (Cw−Cc) V ² } |] ^0.5
Here, Cw = −0.4 and Cc = 0.8.

  FIG. 7 shows the operation of the system according to the present embodiment. FIG. 7A shows a windless state. The air guide device 6 is in the first mode, and both sides of the air passage 22 are open. At this time, due to the temperature difference between the inside and outside of the building, warm air inside the building is exhausted from the upper part of the ventilation tower 4 due to the chimney effect, and outside air flows from the windows (ventilation ports) of each room.

  FIG. 7B shows a state of light to medium wind. The wind guide device is still in the first mode, and both the windward side and the leeward side of the wind path 22 are open. At this time, the cross wind flows from the windward to the windward through the wind path 22, and since the blades 26 are arcuate, a contracted flow is generated in the wind path 22. For this reason, exhaust is promoted by the attractive effect. The situation at this time is represented by a thin solid line in FIG.

  FIG. 7C shows a state during a strong wind. The wind guide device 6 is in the second mode, and the vane plate 26 rotates greatly to close the leeward side of the air passage 22. The wind that has entered the air passage 22 strikes the blades 26 and is then pushed into the ventilation tower 4. The situation at this time is represented by a thick solid line in FIG.

  In addition, what was calculated | required about the wind pressure concerning each part of a rectangular building is well-known, and a wind pressure coefficient can be estimated roughly based on it. More specifically, it is desirable to obtain a wind pressure coefficient for a wind pressure related to each required part such as an opening by a wind tunnel model experiment.

  FIG. 8 shows a modification of the passive (wind-powered) wind guide device of the first embodiment. In this example, instead of the blade-shaped blade plate, a swing plate that also serves as a top plate is used as the wind receiving body 24. This rocking plate has a center of gravity on the windward side of the support shaft 28, and is normally locked to a stopper 41 provided on the inner upper portion of each airflow guide plate. The front portion of the swing plate is gently inclined upward, and is provided so as to open on the windward side as shown in FIG. 9 upon receiving wind pressure and to block the airway 22 on the leeward side. Further, the windward side of the airflow guide plate 20 extends upward so as to match the position of the inclined state of the wind receiving body 24 shown in FIG. 9, and the extension plate portion 20a and the wind receiving body 24 do not leak the cross wind. It is designed to catch and collect air to the ventilation tower 4 side.

  Other embodiments of the present invention will be described below. Among these configurations, the same items as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIGS. 10 to 12 show a second embodiment of the present invention, in which the first and second modes of the wind receiving body are switched by mechanical force.

  In the present embodiment, the air guide device main body 6 a attached to the upper end portion of the ventilation tower 4 is formed by the base portion 8, the air guide portion 18, the drive portion 34, and the sensor portion 36.

  The drive unit 34 is for rotating the vane plate 26 of the air guide unit 18. The drive unit may be fixed at an appropriate position in the base 8 or the airflow guide plate 20 so as not to disturb the movement of the blades.

  The sensor unit 36 includes a wind direction / wind speed sensor 36A and differential pressure sensors 36B and 36C. The wind direction and wind speed sensor 36A is attached to the upper part of the support bar that stands up sufficiently from the base so as not to hinder the movement of the blades 26. The differential pressure sensor 36B is configured to measure a pressure difference inside and outside the ventilation target room R. As a differential pressure sensor, for example, a sensor that uses the principle of a Pitot tube and that can take out an output as an electric signal is conventionally known. The differential pressure sensor 36C is configured to measure the pressure between the air passage and the ventilation target room. In FIG. 10, reference numeral 37A is an outside air temperature / humidity sensor, and 37B is a rain sensor. The outside air enthalpy can be calculated from these outputs.

  Furthermore, the air guide device 6 of the present embodiment has a control unit 38 that is separate from the air guide device body 6a so that the user can easily operate it. The control unit 38 receives the wind speed signal from the sensor unit 36 and sends a command to the drive unit 34 to switch the first and second positions of the wind receiving body 24 and to open the dampers installed in the ventilation ports 2 on each floor. It is provided so that the degree can be adjusted.

FIG. 12 shows the control method of this embodiment. That is, it is determined whether or not the second mode (air supply) is valid in a certain control cycle (update period). When a wind direction / wind speed sensor is used as the sensor unit, the first mode and the second mode are set in a state where the measured wind speed is a reference speed and the wind direction is in a certain range (θ _A <wind direction (°) <θ _B ). Can be switched between. When a differential pressure sensor is used instead of the wind speed sensor, for example, the total pressure in the wind direction and the static pressure in the direction perpendicular to the wind direction are measured at one observation point, and the wind speed is calculated from the pressure difference (dynamic pressure). What is necessary is just to calculate. And what is necessary is just to switch between 1st, 2nd mode in the state in which the measured wind speed is reference | standard speed. As another method, first, the pressure Sct at the top of the ventilation tower and the pressure Scs at the ventilation port are respectively measured. Usually, the wind is stronger in the sky, so when the ventilation port is on the windward side, Sct <Scs, but when this is reversed and Sct> Scs, switching between the first and second modes is performed. Can do.

  It should be noted that a mode in which the blades are moved by wind force and a mode in which the blades are moved by mechanical force can be used properly. For this purpose, a conventionally known rotation link / release mechanism 42 may be provided between the drive unit and the support shaft as shown in FIG.

  FIG. 14 shows a first modification of the second embodiment. In the example of FIGS. 10 to 13, a part of the wall forming the air passage is a wind receiving body, whereas in this example, a damper is installed as the air receiving body 24 inside the passage wall forming the air passage. Is. The damper is installed at one end of the air passage, and the other end of the air passage is always open. The damper may be opened and closed by a driving unit (not shown).

  FIG. 15 shows a second modification of the second embodiment. In this example, the top plate 40 is spanned between the upper ends of the airflow guide plates to define the air passage 22 and the portion outside the ventilation tower of the air passage (the wind direction upwind indicated by the arrow in FIG. 15). And a leeward part) are provided with a pair of damper-shaped wind receiving bodies 24, 24. Each wind receiving body is preferably provided so that the air passage is completely blocked and all the air that has entered the air passage is sent into the ventilation tower. Each wind receiving body is opened and closed by a driving unit (not shown). FIG. 16 is a flowchart showing the operation control method of this modification. That is, in a certain control cycle, if the wind from the right side of the drawing satisfies a certain air supply condition (wind speed is above a certain level), the wind receiving body on the left side of the drawing is closed and the wind receiving body on the right side of the drawing is opened. (Air supply 1 mode). If the wind from the left side of the drawing satisfies a certain air supply condition in the next cycle, the wind receiving body on the right side of the figure is closed and the wind receiving body on the left side of the figure is opened (air supply 2 mode). Further, in the next cycle, if the wind satisfying the air supply condition does not enter from either the left or right side of the drawing, both the right and left wind receiving bodies are closed (exhaust mode). Further, in the case of a strong wind such as a typhoon, both the wind receiving bodies 24 may be closed.

  FIG. 17 shows a third example of the third embodiment. In this example, a single wind receiving body 24 is rotatable between a standing state and a suspended state about 180 ° around an appropriate position at the lower end of the air passage.

  18 to 19 illustrate a ventilation system using passive natural ventilation, automatic natural ventilation, and mechanical ventilation as a third embodiment of the present invention.

  First, since natural ventilation is generally difficult to use when excessive wind, heavy rain, extreme cold, and extreme heat, an algorithm as shown in FIG. 18 may be used to switch to mechanical ventilation in these environments. FIG. 19 shows the overall control flow of this algorithm as a natural ventilation permission block for determining when natural ventilation should not be performed. That is, in the case where natural ventilation is possible, when the operation by wind power (self-actuated operation) is desirable, the rotation force of the driving unit for rotating the wind receiving body is not transmitted to the wind receiving body, and the operation by the mechanical force (power) When operation is desired, the above-described rotational force may be brought into a lock-on state where the rotational force is transmitted to the passive member.

  20 and 21 show a fourth embodiment of the present invention. In this embodiment, instead of the fin-shaped vane plate of the first embodiment, a closing plate is configured to turn around a support shaft.

  First, in the present embodiment, a pair of airflow guide plates 20 that are parallel to each other are vertically erected from the left and right ends of a horizontal substrate 10 that is long in the front-rear direction, and the top plate 40 is disposed between the upper ends of the airflow guide plates 20. The air passage 22 that is rectangular as viewed from the front-rear direction is formed by these substrates, the airflow guide plate, and the top plate. And the communicating hole 12 is drilled in the corresponding part of the board | substrate 10 so that the front-back direction intermediate part 22c of this wind path may be faced. A first retracting recess 44 is formed in an intermediate portion of the substrate 10 so as to overlap the upper half of the communication hole 12. The illustrated recess is a recess groove extending across the entire width of the substrate in the left-right direction as shown in FIG. As shown in FIG. 20, the cross-sectional shape of the retracting recess viewed from the side has an arc shape with a support shaft 28 described later as the center of curvature.

  A second retracting recess 45 is formed on the back surface of the intermediate portion of the top plate 40 so as to face the first retracting recess 44. The second retracting recess is also formed in a retracting groove extending across the entire width of the top plate in the left-right direction of the top plate 40. The cross-sectional shape of the second retracting recess also has the same curvature as the first retracting recess, with the support shaft 28 as the center of curvature.

    A support shaft 28 is installed between the airflow guide plates 20 and 20 between the first and second retracting recesses. The support shaft is configured to rotate by a control unit (not shown).

  A wind receiving body 24 is rotatably provided around the support shaft 28. The wind receiving body 24 is formed by a plurality of connecting pieces (connecting rods) 46 protruding from the support shaft 28 and a closing plate 48 supported by these connecting pieces. The closing plate has an arc shape that is slightly smaller than the cross section of the first and second retracting recesses when viewed from the side. The closing plate is formed so that its outer surface is substantially flush with the inner surface of the cavity around the recess when housed in each recess, so that when a strong wind blows into the air passage, It is possible to suppress the wind pressure acting on the.

  In the above configuration, in the first mode, the closing plate 48 may be retracted in the second retracting recess 45, whereby the cross wind passes through the air passage 22. In the second mode, the blocking plate 48 shields the one end 24a or the other end 24b of the air passage on the leeward side. In the case of a typhoon or the like, the closing plate 48 is accommodated in the first retracting recess 44 and the communication hole 12 is closed with this closing plate. This can prevent wind and rain from being blown into the ventilation tower.

  22 to 24 show a fifth embodiment of the present invention. In the present embodiment, the wind receiver 24 is a shutter type. That is, the pair of left and right airflow guide plates 20 and 20 are extended long downward, and a groove-shaped guide rail 50 is formed in an inverted U shape on the inner peripheral edge portion of each plate including the extended portion. In particular, by making the upper corner of the guide rail a gentle curve, it is possible to reduce the energy loss of the airflow sent to the ventilation tower 4 along the wind receiving body.

  A shutter type wind receiving body 24 is bridged between the guide rails. This wind receiving body is provided so that a plurality of strip plates 52 can be connected and moved along the rail. A pulling means such as a chain may be provided in the guide rail, and the guide rail may be moved in conjunction with the drive unit 34 via the transmission vehicle 54 or the like. In the above configuration, in the first mode, the wind receiving body 24 is retracted to the leeward side of the ventilation tower 4 as shown in FIG. In the second mode, the wind receiving body covers the leeward side of the airflow guide plate 20 in a curved state, and the cross wind is smoothly fed into the ventilation tower 4 while curving along the curved surface.

1 is an overall configuration diagram of a natural ventilation system according to a first embodiment of the present invention. It is a front view of the wind guide apparatus used for the system of FIG. It is a top view of the air guide apparatus of FIG. It is a principle explanatory view of the device of FIG. It is action | operation explanatory drawing of the apparatus of FIG. It is a graph which shows the relationship between the ventilation volume and wind speed in the system of FIG. FIG. 2 is an operation explanatory diagram of the system of FIG. 1. It is a modification of the wind guide apparatus of FIG. It is action | operation explanatory drawing of the wind guide apparatus of FIG. It is a whole block diagram of the natural ventilation system which concerns on the 2nd Embodiment of this invention. It is a top view of the wind guide apparatus used for the system of FIG. 11 is a flowchart of the operation of the system of FIG. It is drawing which expands and shows the principal part of the system of FIG. It is another modification of the wind guide apparatus of the system of FIG. It is a modification of the wind guide apparatus of the system of FIG. It is a flowchart of operation | movement of the modification of FIG. It is the further another modification of the wind guide apparatus of the system of FIG. It is operation | movement explanatory drawing of the system which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows the whole operation | movement of the system of FIG. It is the expanded sectional view which looked at the principal part of the 4th Embodiment of this invention from the side. It is the enlarged front view which looked at the principal part of the apparatus of FIG. 20 from the front. It is a side view which shows the wind guide apparatus of the ventilation tower utilization type natural ventilation system which concerns on the 5th Embodiment of this invention. It is a top view of the air guide apparatus of FIG. It is operation | movement explanatory drawing of the system of FIG.

Explanation of symbols

2 ... Ventilation port 4 ... Ventilation tower 5 ... Vertical shaft 6 ... Air guide device 6a ... Air guide device body
DESCRIPTION OF SYMBOLS 8 ... Base 10 ... Board | substrate 10a ... Extension board part 12 ... Communication hole 14A, 14B ... Board | substrate front-and-back end 16 ... Mounting cylinder 18 ... Air guide part 20 ... Airflow guide plate 21 ... Bearing hole 22 ... Air path 22a, 22b ... Same end Part 22c ... Intermediate part 24 ... Wind receiving body 26 ... Blade plate 28 ... Support shaft 30 ... Resistance mechanism 34 ... Drive part 36 ... Sensor part 36A ... Wind direction anemometer 36B, 36C ... Differential pressure sensor 37A ... Outside temperature humidity sensor 37B ... Rain sensor 38 ... Control unit 40 ... Top plate 41 ... Stopper 42 ... Rotating link / release mechanism 44 ... First retracting recess 45 ... Second retracting recess 46 ... Connecting piece 48 ... Blocking plate
50 ... Guide rail 52 ... Strip 54 ... Transmission vehicle
B ... Building R ... Ventilated room C ... Corridor

Claims (9)

It is possible to exhaust the air in the building from the ventilation tower and supply air from the ventilation opening by utilizing the gravity ventilation effect due to the difference in the air density between the upper and lower ends of the ventilation tower 4 standing from the building with the ventilation opening 2 In natural ventilation system,
At the upper end of the ventilation tower 4, a wind guide device 6 serving as an exhaust port and an intake port is attached.
This wind guide device includes an air passage that opens in the lateral direction, and an intermediate portion of the air passage is made to face the upper end opening of the ventilation tower 4 so that the cross wind is in the first mode in which the wind speed is less than the reference speed. In the second mode where the wind speed is higher than the reference speed, the cross wind is captured and pushed into the ventilation tower.
Switching between the first mode and the second mode of the wind guide device can be performed by mechanical power or wind power.
Further, in the second mode, by making the pushing force of the side wind by the wind guide device 6 at least larger than the gravity ventilation action, it is possible to supply outside air to the building via the ventilation tower 4. This is a natural ventilation system using a ventilation tower. It is provided so that it can be attached to the top of the ventilation tower of the building,
Including an airway that opens laterally,
In the first mode in which the wind speed is less than the reference speed with the middle part of the wind path facing the upper end opening of the ventilation tower, the second mode in which the cross wind passes through the wind path and the wind speed is higher than the reference speed. It is a wind guide device having a wind trapping action, which is provided so as to capture the cross wind and push it into the ventilation tower,
The above airway extends almost straight in the lateral direction,
The wind guide portion 18 for guiding the cross wind to the ventilation tower is composed of a pair of air flow guide plates 20 that face each other to define the air passage 22 and a wind receiving body 24 that is located between these air flow guide plates at least in the second mode. And
The wind receiving body 24 is provided so that it can move between a first position where the cross wind can blow through the wind path 22 horizontally and a second position where the wind path 22 is blocked to receive the cross wind. A wind guide device having a wind trapping action for a natural ventilation system using a ventilation tower.   3. The wind-capturing action for a natural ventilation system using a ventilation tower according to claim 2, wherein the wind receiving body is configured to move between a first position and a second position by wind power. A wind guide device. A wind guide device body 6a including at least the above-described wind guide portion 18 and a drive portion 34 for moving the wind receiving body 24 of the wind guide portion is configured to be attachable to the upper end portion of the ventilation tower 4, and the drive portion thereof A control unit 38 for controlling the air pressure, and a sensor unit 36 connected to the control unit for measuring the wind speed or air pressure around the building or the ventilation tower,
The drive unit is controlled so that the wind receiving body 24 moves between the first position and the second position in accordance with the wind speed or air pressure measured by the sensor unit. A wind guide device having a wind trapping action for a natural ventilation system using a ventilation tower.   3. The wind receiving body 24 is formed of a blade plate 26 that can move between a first position and a second position by rotating around a support shaft 28. The wind guide apparatus which has a wind-capturing effect | action for the ventilation tower utilization type natural ventilation system in any one of Claim 4. The pair of airflow guide plates 20 are installed vertically and in parallel so that they can be arranged on both sides of the opening of the ventilation tower 4,
The wind receiving body 24 has both the front and back surfaces of a blade 26 that is long in the direction of the wind path 22 facing up and down, and supports an intermediate portion of the blade on a horizontal support shaft 28 so that the wind path 22 can enter the wind path 22 from one direction. When the cross wind is blown, the other end of the blade plate 26 shields the air passage portion on the other edge side of the opening of the ventilation tower 4, and when the cross wind is blown into the air passage 22 from the other direction, the blade plate The wind trapping action for a natural ventilation system using a ventilation tower according to claim 5, characterized in that the other end portion of 26 is formed so as to shield an air passage portion on the other edge side of the opening portion of the ventilation tower (4). A wind guide device.   The vane plate 26 is curved from the middle portion in a horizontal state and protrudes from the free end portion upward and outward, so that the upper end surface of the opening portion and the rear surface of the vane plate 26 are installed in the opening portion of the ventilation tower. A wind guide having wind-capturing action for a natural ventilation system using a ventilation tower according to claim 6, characterized in that the flow path width of the air passage 22 between the two is narrowed at an intermediate portion of the vane plate (26). apparatus. A pair of airflow guide plates 20 that define the air passage 22 are erected from both sides of the substrate 10, and a top plate 40 is horizontally provided between the upper portions of the airflow guide plates.
In the intermediate portion 22c excluding both ends 22a and 22b of the air passage 22, the substrate 10 is provided with a communication hole 12 with the inside of the ventilation tower,
A support shaft 28 crossing above the communication hole is installed between the airflow guide plates 20 and 20,
A wind receiving body 24 formed by projecting a closing plate 48 from the support shaft via a connecting piece 46 is provided so as to be rotatable around the support shaft.
The closing plate 48 is configured to sequentially close one end portion 22a of the air passage 22, close the communication hole 12, or close the other end portion 22b of the air passage 22 by rotation around the support shaft 28. ,
Further, recess recesses 44, 45 are provided in one or both of the upper surface of the substrate intermediate portion including the upper opening of the communication hole 12 and the lower surface of the corresponding top plate portion,
5. The trap for a natural ventilation system using a ventilation tower according to claim 4, wherein the closing plate is configured to be accommodated in the retracting recesses 44 and 45 by rotating around the support shaft. A wind guide device having a wind effect. The wind receiving body 24 is spanned between a pair of guide rails 50 and serves as a shutter composed of a plurality of strip plates 52 connected to each other, and the first position and the second position along the guide rails 50. The wind guide device having a wind trapping action for a natural ventilation system using a ventilation tower according to claim 4, wherein the wind guide device is configured to move linearly between the two.