JP3688696B2 - Ventilation structure for buildings - Google Patents

Description

  The present invention relates to a ventilation structure for a building installed in a building, such as a factory, a gymnasium, or a warehouse, for example.

  This type of ventilation structure is known from US Pat. There, the ventilation structure is composed of two sets of shielding units connected in a mountain shape. The shielding unit is configured such that horizontal louver plates are arranged opposite to each other in the upper and lower stages in and out of pillars arranged at regular intervals. The louver plate is made of a folding plate material in which the upper part of the belt-shaped metal plate material is folded inward and the lower part is folded outward, and the upper and lower edges of adjacent louver plates are attached so as to overlap in the vertical direction. . The periphery of the ventilation opening opened in the ridge portion is surrounded by a rectangular frame-shaped draining board including a vertical wall.

  In the ventilation structure of the present invention, the louver frames are arranged vertically and horizontally, and this type of ventilation unit is known from Patent Document 2. There, a group of horizontal louver frames are arranged in a multi-stage array on the outer surface of a rectangular shape-retaining frame body, and a group of vertical louver frames are arranged in a straight line in the left-right direction on the inner surface as a ventilation unit. Yes. The vertical louver frame is formed of an aluminum strip having a cross-sectional shape, and the horizontal louver frame is formed of an aluminum strip having a J-shaped cross section.

Japanese Examined Patent Publication No. 2-14503 (page 2, column 3, Fig. 5) JP 2002-276256 A (paragraph number 0010, FIG. 2)

  According to the ventilation structure of patent document 1, since the ventilation path of the shielding unit is in an inverted Ω shape even at the shortest, it is possible to prevent rainwater from entering the room. However, since the louver plates are close to each other inside and outside, part of the rainwater may be blown into the indoor side along with the air flow during a storm, leaving uncertain waterproof performance. In the ventilation unit of Patent Document 2, raindrops blown with the wind can be separated by bending and reversing the flow of air with vertical and horizontal louver frames, but the raindrops are separated mainly with the indoor vertical louver frame. There is a risk that the airflow containing raindrops that could not be removed will blow into the indoor side, and as with the previous shielding unit, there remains concern about the waterproof performance during storms. In both the shielding unit and the ventilation unit, when condensation forms on the surface of the louver plate or the louver frame on the indoor side, there is a risk that condensed water may drip into the room through the ventilation opening. There is room for.

  An object of the present invention is to provide a building ventilation structure that can reliably prevent raindrops from blowing during a storm and can exhibit a higher level of waterproof performance than a conventional ventilation structure. The objective of this invention is providing the ventilation structure for buildings which can prevent the dew condensation which arises on the surface of the indoor louver frame dripping indoors. The objective of this invention is providing the ventilation structure for buildings which can perform attachment of a ventilation unit simply with little effort, and can reduce the effort and time which construction of a ventilation structure requires by that much.

  The building ventilation structure according to the present invention includes a ventilation unit 1 that stands and faces the ventilation opening 2. The ventilation unit 1 includes a shape retaining frame 9 assembled in a quadrilateral shape, a group of outer louver frames 10 assembled to the shape retaining frame 9 in a multistage array, and a linear array on the inner surface of the outer louver frame 10. A group of central louver frames 11 and a group of inner louver frames 12 assembled in an inner surface of the central louver frame 11 in a multi-stage manner. As shown in FIG. 1, both the inner and outer louver frames 10 and 12 and the central louver frame 11 are adjacently arranged in the inner and outer directions in a state of intersecting vertically and horizontally. The ventilation path T that passes through each louver frame 10, 11, 12 is a first path T 1 that is obliquely downward defined by the adjacent outer louver frame 10, and a middle part defined by the adjacent central louver frame 11 is bent. It is composed of two paths T2 and a third path T3 that is obliquely upward defined by the adjacent inner louver frame 12 (claim 1).

  As shown in FIG. 4, the outer louver frame 10 and the inner louver frame 12 include a first wall 21 that is received by the vertical frame 9 a of the shape retaining frame 9 and a second wall that contacts the central louver frame 11, respectively. 22 and an oblique third wall 23 that connects both the first and second walls 21 and 22 and is formed of an aluminum material having a modified cross-sectional shape. The outer louver frame 10 and the inner louver frame 12 are fixed to the shape-retaining frame 9 with the third walls 23 of both 10 and 12 being inclined in an inverted C shape (Claim 2).

  An entrance and an exit of the second path T2 are defined by the second wall 22 facing inside and outside with the central louver frame 11 in between (claim 3).

  The upper surface of the ventilation opening 2 is covered with a pair of ventilation units 1 assembled in an inverted V shape. As shown in FIG. 7, the lower horizontal frame 9c of the shape retaining frame 9 of each ventilation unit 1 is fastened and fixed to a mounting bracket 45 fixed to the roof base B (Claim 4).

  As shown in FIG. 9, a drainage channel led out from the inner casing 52 is arranged between the shape retaining frame 9 of each ventilation unit 1 facing the ventilation opening 2 and the roof base B with an inner casing 52 for receiving dew condensation water. 54 faces the outer surface of the roofing material 56 (Claim 5).

  As shown in FIG. 10, a snow melting heater 62 is arranged inside a lower horizontal frame 9c formed of a hollow aluminum strip (Claim 6).

  As shown in FIG. 5, the central louver frame 11 has an outer base wall 28 and an inner base wall 29 that receive the outer louver frame 10 and the inner louver frame 12, and is bent in a cross-sectional shape that connects both the base walls 28 and 29. The wall 30 is integrally provided. A first reversing portion 31 for reversing and guiding the air flow passing through the second path T2 and a second reversing portion 32 are formed on the outer surface of the bent portion of the bent wall 30 and the inner surface of the end portion of the inner base wall 29, respectively. (Claim 7).

  In the building ventilation structure according to the present invention, the outer louver frame 10, the central louver frame 11, and the inner louver frame 12 are assembled to the shape retaining frame 9 so as to form a triple structure in the inner and outer directions, and both the inner and outer louvers are assembled. By arranging the frames 10 and 12 and the central louver frame 11 vertically and horizontally, the ventilation path T passing through each of the louver frames 10, 11, and 12 passes through the first path T 1 obliquely downward and the second part where the middle part is bent. The path T2 and the third path T3 that is obliquely upward are configured to repeatedly change the air flow including raindrops to increase the chance of raindrop separation. Therefore, according to the ventilation structure of the present invention, it is possible to exhibit a higher level of waterproof performance than that of this type of conventional ventilation structure. It is possible to effectively ventilate indoors while preventing it (Claim 1).

  According to the ventilation unit 1 in which the outer louver frame 10 and the inner louver frame 12 are fixed to the shape-retaining frame body 9 with the third walls 23 of both 10 and 12 inclined in an inverted C shape, Raindrops and snow blown up from the eaves side to the ridge side along the outer surface can be received by the third wall 23 facing the outer surface of the ventilation structure to reliably prevent raindrops and snow from blowing into the ventilation unit 1. In addition, the attachment structure of the ventilation structure can be simplified by the amount of low resistance to the blowing wind (claim 2).

  According to the ventilation unit 1 that defines the inlet and the outlet of the second path T2 with the second wall 22 of the outer louver frame 10 and the inner louver frame 12 that are opposed to the inner and outer sides with the central louver frame 11 in between. Since the outlet position of T2 can be blocked by the second wall 22 of the inner louver frame 12 to define the outlet position, the air flow blown from the first path T1 into the second path T2 causes the second path T2 to be inclined downwardly. Therefore, the air flow that has entered the second path T2 is allowed to flow into the first reversing unit 31 and the second reversing unit 32 in a substantially orthogonal shape, and the reversing units 31 and 32 generate raindrops. Separation can be performed reliably, and the reliability of the ventilation structure can be improved by that amount (claim 3).

  A ventilation structure is configured by using a pair of ventilation units 1 assembled in an inverted V shape as element units, and fastened to a mounting bracket 45 in which the lower horizontal frame 9c of the shape retaining frame 9 of each ventilation unit 1 is fixed to the roof base B. According to the ventilation structure that is fixed, the ventilation unit 1 can be attached to the roof by simply fixing the attachment bracket 45 to the roof and further fastening and fixing each ventilation unit 1 to the attachment bracket 45. Compared to the conventional ventilation structure that had to be provided with a structure such as a frame on the roof side in advance, installation of the ventilation structure can be performed easily with less effort, and the work and time required for construction can be reduced accordingly. (Claim 4).

  Ventilation 52 is arranged between the shape retaining frame 9 of the ventilation unit 1 and the roof base B, and the drainage 54 led out from the inner fence 52 faces the outer surface of the roofing material 56. According to the structure, the dew condensation water generated on the surface of the inner louver frame 12 on the indoor side can be received by the inner wall 52 and discharged to the outer surface of the roof, so that the dew condensation water is surely dripped into the room through the ventilation opening 2. It is excellent in that the overall waterproof performance of the ventilation structure can be improved in combination with the ability to prevent the raindrops from blowing.

  According to the ventilation unit 1 in which the snow melting heater 62 is arranged inside the lower horizontal frame 9c formed of a hollow aluminum strip, it is intended to freeze near the upper surface of the lower horizontal frame 9c serving as a drain port of the ventilation unit 1. Since the rainwater and snow can be heated and flowed down with the heater 62, the water flowing down in the ventilation unit 1 can be surely prevented from spilling into the frozen part and the snow accumulated on the upper surface and overflowing into the indoor side. The ventilation structure can function properly even in cold regions (Claim 6).

  The outer base wall 28, the inner base wall 29, and the bent wall 30 having a square cross section connecting both the base walls 28, 29 constitute the central louver frame 11, and the outer surface of the bent portion of the bent wall 30 and the inner base wall 29 According to the ventilation unit 1 in which the first reversing part 31 for reversing and guiding the air flow passing through the second path T2 and the second reversing part 32 are formed on the inner surface of each end of the second path T2, The air flow to be passed is reversed and guided in both reversing portions 31 and 32, and raindrops having a large kinetic inertia compared to the air flow are caused to collide with the first reversing portion 31 and the second reversing portion 32 during that time. Can be separated from the air flow. In other words, it is possible to increase the chances of separating the raindrops and more reliably prevent the airflow including the raindrops from blowing into the indoor side (claim 7).

  1 to 9 show an embodiment of a ventilation structure for buildings according to the present invention. 2 and 3, the ventilation structure is formed in a triangular roof shape with the square ventilation unit 1 as a main component, and covers the upper surface of the ventilation opening 2 opened in the ridge portion of the roof. In FIG. 2, reference numeral 3 denotes an end wall that closes the end opening of the ventilation unit 1 assembled in an inverted V shape, 4 is a top plate that covers the upper surface of the connection part of the ventilation unit 1, and 5 is a connection part cover.

  4 and 5, the ventilation unit 1 includes a shape retaining frame 9 assembled in a quadrangular shape, an outer louver frame 10 assembled in a multistage array on the shape retaining frame 9, a central louver frame 11, and an outer louver frame. 10, the inner louver frame 12 is assembled on a multistage row. The shape-retaining frame 9 is composed of a pair of vertical frames 9a and an upper horizontal frame 9b and a lower horizontal frame 9c that connect the upper ends and lower ends of the vertical frames 9a. The vertical frame 9a is made of an aluminum strip having an H-shaped cross section, and a second connection fitting 14 having a U-shaped cross section is fixed to the outer surface thereof. The upper horizontal frame 9b is made of an aluminum strip having a C-shaped cross section, and the lower horizontal frame 9c is formed of a hollow strip having an irregular cross section made of aluminum.

  In FIG. 4, the lower horizontal frame 9 c has a hollow quadrilateral base portion 15 that is inclined obliquely. A fastening wall 16 and a support wall 17 project from the lower surface and the upper surface of the base portion 15, and are continuous to the inner side of the base portion 15. The receiving wall 18 protrudes upward. The bottom surface of the base 15 is inclined to match the slope of the roof. The interior of the base portion 15 is divided into four compartments by a reinforcing wall 19 that connects the upper and lower wall surfaces. The receiving wall 18 functions as a water blocking wall, and is provided to prevent rainwater flowing down from above the ventilation unit 1 from being blown off by the airflow and entering the room.

  In FIG. 4, the outer louver frame 10 includes a first wall 21 and a second wall 22 that are arranged in parallel with each other in the upper and lower sides, and a third wall that obliquely connects the first and second walls 21 and 22. And a screw thread groove 24 for a screw is formed in the middle portion of the third wall 23. As shown in FIG. 4, the outer louver frame 10 is applied to the vertical frame 9a in a state where the third wall 23 is inclined obliquely downward and the first wall 21 is in contact with the inner surface of the outer wall of the vertical frame 9a. The outer louver frame 10 is fixed to the vertical frame 9a by screwing the screw 25 into the screwing groove 24 from the outer surface of 9a (see FIG. 5). The group of outer louver frames 10 are fixed at regular intervals in a posture parallel to the upper horizontal frame 9b, and an obliquely downward first path T1 that forms a ventilation path T between the upper and lower adjacent outer louver frames 10. (See FIGS. 1 and 4).

  Since the inner louver frame 12 is the same aluminum strip as the outer louver frame 10, the same members are denoted by the same reference numerals and description thereof is omitted. The attachment structure of the inner louver frame 12 to the vertical frame 9a is basically the same as that of the outer louver frame 10, but is different from the outer louver frame 10 in that the inner louver frame 12 is fixed in an inverted state. Between the inner louver frames 12 adjacent in the vertical direction, an obliquely upward third path T3 constituting the ventilation path T is formed (see FIGS. 1 and 4). In a state where both the inner and outer louver frames 10, 12 are fixed to the inner surface of the vertical frame 9a, the third walls 23, 23 are inclined in an inverted C shape as shown in FIG. The outer louver frame 10 is arranged over the entire length in the vertical direction of the vertical frame 9a, whereas the lowermost position of the inner louver frame 12 is the upper end of the receiving wall 18 of the lower horizontal frame 9c as shown in FIG. It is in the vicinity.

  In FIG. 5, the central louver frame 11 is made of an aluminum strip that is integrally provided with an outer base wall 28 and an inner base wall 29 that are parallel to the inner and outer sides, and a bent wall 30 having a square cross section that connects the base walls 28 and 29. Therefore, the louver frames 10 and 12 are arranged in a straight line between the inner and outer louver frames 10 and 12 so as to be orthogonal to the louver frames 10 and 12. On the outer surface of the bent portion of the bent wall 30 and the inner surface of the end portion of the inner base wall 29, a first inversion portion 31 and a second inversion portion 32 each having a groove shape are formed. A screw thread 33 for screws is formed in a continuous portion between the bent wall 30 and the inner and outer base walls 28 and 29. Between the central louver frames 11 adjacent to each other in the lateral direction, the second path T2 constituting the ventilation path T is formed in a state of being bent into a square shape (see FIGS. 1 and 5).

  As shown in FIG. 5, the central louver frame 11 is arranged at regular intervals in a posture parallel to the vertical frame 9a, and screws 34 are screwed into the screwing grooves 33 from the upper surface side of the upper horizontal frame 9b as shown in FIG. Thus, the upper horizontal frame 9b is integrated. The lower part of each central louver frame 11 is fastened and fixed to the inner base 36 with screws 35. The inner base 36 is made of an aluminum strip having a T-shaped cross section, and the vertical wall portion is fastened and fixed to the support wall 17 with screws 37 in a state where the horizontal wall engages with the lower horizontal frame 9c.

  As described above, in the state where the central louver frame 11 is fixed to the shape retaining frame 9, as shown in FIG. 5, the outer base wall 28, the first inversion portion 31 of the adjacent central louver frame 11, Three people with the 2 reversing part 32 overlap inside and outside. Therefore, the airflow passing through the second path T2 is reversed and guided by the first reversing unit 31 and the second reversing unit 32, respectively, as shown in FIG. Can be made to collide with the 1st inversion part 31 and the 2nd inversion part 32, and the raindrop contained in the airflow can be isolate | separated.

  As shown in FIG. 3, the pair of ventilation units 1 configured as described above are arranged upright in an inverted V shape, and the upper ends of the shape retaining frame 9 are inverted in a reverse shape as shown in FIG. It is fastened and fixed via the first connection fitting 39. The first connection fitting 39 is fastened and fixed to the fastening fitting 40 fitted in the upper horizontal frame 9b with a bolt 41 and a nut 42. The outer surface of the connecting portion is covered with the top plate 4.

  As shown in FIG. 7, the ventilation unit 1 is fixed to a mounting bracket 45 fixed to the roof base B facing the ventilation opening 2. The mounting bracket 45 is an L-shaped press-molded product, and its horizontal wall is fixed to the roof base B with bolts 46, and the fastening wall 16 of the lower horizontal frame 9c is applied to the outer surface of the vertical wall and fixed with bolts 47. As described above, according to the mounting structure in which the ventilation unit 1 is directly fastened to the mounting bracket 45 fixed to the roof base B, there is no need to provide a frame or a bracket for supporting the ventilation structure on the roof base B side. The ventilation unit 1 can be fixed to the roof base B with less effort, and the overall structure of the ventilation structure can be simplified.

  The ventilation units 1 adjacent to each other in the longitudinal direction are connected and integrated by a connection structure described below. Specifically, as shown in FIG. 8, the ventilation units 1 are arranged adjacent to each other in a state where the second connection fittings 14 provided in the vertical frame 9a are alternately engaged with each other, and the outer surface of the vertical frame 9a is made of an aluminum strip. After the rail 48 is applied in a bridge shape, the bolt 49 inserted through the fastening rail 48 is screwed into the second connection fitting 14 to integrate the adjacent ventilation units 1 together. Reference numeral 50 denotes a watertight packing disposed between the fastening rail 48 and the vertical frame 9a. The outer surface of the fastening rail 48 is covered with the connecting portion cover 5 that is engaged with and attached to the fastening rail 48.

  In order to prevent condensation from dripping indoors through the ventilation opening 2 when condensation occurs on the surface of the inner louver frame 12 on the indoor side, as shown in FIG. Between the lower part of the body 9 and the roof base B, an inner collar 52 having a U-shaped cross section is arranged. The inner rod 52 is arranged over substantially the entire length of the ventilation opening 2 and is supported by brackets 53 fixed to the roof base B at regular intervals, and the inner louver frame 12, the receiving wall 18, and the lower horizontal frame 9c. Condensed water dripping from a part of the lower surface of the glass can be received.

  In order to discharge the dew condensation water in the inner casing 52 to the outside, a drainage channel 54 is provided for each connecting portion of the ventilation unit 1 adjacent in the longitudinal direction. As shown in FIG. 9, the drainage channel 54 is made of a frame having a U-shaped cross section, and its end on the inlet side communicates with the inner rod 52, and a locking portion 55 provided on the end on the outlet side has a roof material 56. The connecting portion 57 is engaged from the outer surface side. The outer surface of the drainage channel 54 is covered with an end cover 58 that covers the ridge side end of the roof material 56. Condensed water in the inner wall 52 is guided to flow down to the outer surface of the connecting portion 57 of the roof material 56 through the drainage channel 54, and is discharged to the outer surface of the uppermost roof material 56. In FIG. 7, reference numeral 59 denotes a suspension for fixing the roof material 56 to the roof base B.

  According to the ventilation structure configured as described above, as shown in FIG. 1, the first path T <b> 1 obliquely downward, the second path T <b> 2 whose middle part is bent like a letter, and the third path T <b> 3 obliquely upward Since the ventilation air is introduced into the indoor side through the continuous three-dimensional bent ventilation path T, raindrops can be separated from the airflow whenever the direction of the airflow changes. The airflow including raindrops can be reliably eliminated from blowing into the indoor side.

  Since both the louver frames 10 and 12 are fixed to the shape retaining frame 9 with the third wall 23 of the outer louver frame 10 and the inner louver frame 12 inclined in an inverted C shape, wind including raindrops is applied to the roof surface. The raindrops can be received by the third wall 23 and separated from the air flow when blown from the eaves side toward the ridge side, so that the central louver can be compared with the case where the third wall 23 is inclined in the opposite direction. The separation load of raindrops by the frame 11 can be reduced, and raindrops can be prevented more reliably from entering the room.

  Since the inlet of the second path T2 is defined by the second wall 22 of the outer louver frame 10, and the outlet side opening of the second path T2 is blocked by the second wall 22 of the inner louver frame 12, thereby defining the outlet. The airflow blown from the first path T1 into the second path T2 can be prevented from blowing through the second path T2 obliquely downward. That is, as shown in FIG. 5, the air flow that has entered the second path T <b> 2 flows into the first reversing unit 31 and the second reversing unit 32 in a substantially orthogonal shape, and the raindrops using the motion inertia are used. Separation can be performed reliably.

  FIG. 10 shows another embodiment of the present invention. In this case, the heater 62 for melting snow is arranged inside the lower inclined side of the lower horizontal frame 9c made of a hollow aluminum strip to prevent freezing of snow and rain water near the upper surface of the lower horizontal frame 9c. Different from the example. The upper surface of the lower horizontal frame 9c is an outlet for rainwater that has been separated from the air flow and has flowed down the ventilation louver 1, but this portion is frozen and further covers the outer surface of the outer louver frame 10 on the lower stage side. When snow accumulates, the water flowing down in the ventilation unit 1 is blocked by a frozen portion or snow, and may get over the receiving wall 18 and overflow to the indoor side. In order to prevent such water leakage in the cold season, a snow melting heater 62 is provided.

  As a power source for the snow melting heater 62, a solar cell 63 disposed on the outer surface of the ventilation unit 1 can be used. In that case, for example, the solar cell 63 is arranged in a part in the longitudinal direction of the ventilation unit 1 so that the solar cell 63 can prevent the ventilation action of the ventilation unit 1 from being inhibited as much as possible. In addition, you may utilize the electric power generated with the solar cell 63 as a power supply of the ventilation fan provided in the vicinity of the ventilation opening 2, or a lighting fixture. Of course, the heater 62 can be operated using a commercial power source together with the solar battery 63.

  FIG. 11 shows an embodiment in which the ventilation structure of the present invention is applied to a folding roof. There, the ventilation unit 1 was supported by a mounting bracket 45 fixed to the folded-roof roof material 56. Further, the end of the folded roofing roof material 56 on the ridge side protrudes to the lower surface side of the ventilation unit 1 so that the folded roofing roof material 56 itself also functions as the inner roof 52. In order to prevent rainwater from being blown in, the valley portion of the folding roof material 56 is closed with an apron 66, and the upper end of the valley portion is closed with a partition plate 65. Since others are the same as the previous embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted.

  In the above embodiment, the ventilation unit 1 is assembled in a triangular roof shape to form a ventilation structure. However, it is not necessary, for example, a pair of ventilation units 1 are arranged vertically and the upper ends of both units correspond to the top plate. It can take the form covered with the roofing material. In that case, the outer lower frame 9c can be formed of an aluminum strip having a channel cross section similar to the upper horizontal frame 9b. The outer louver frame 10 and the inner louver frame 12 can be arranged in a state in which the second walls 22 face each other in a staggered manner. The outer louver frame 10 and the inner louver frame 12 do not necessarily have the same structure, and the cross-sectional structure of the inner louver frame 12 can be changed according to specifications required for the ventilation structure.

  A daylighting window can be formed by fitting a transparent glass or plastic material into a part of the longitudinal direction of the ventilation unit 1. The ventilation structure of the present invention can be applied to a vertical roof in addition to the side roof described in the embodiments.

It is a perspective view which shows the louver structure and ventilation path | route of a ventilation unit. It is a perspective view which shows the external appearance structure of a ventilation structure. It is a longitudinal cross-sectional view of a ventilation structure. It is a longitudinal cross-sectional view of a ventilation unit. It is a cross-sectional view of a ventilation unit. It is sectional drawing which shows the upper connection structure of a ventilation unit. It is sectional drawing which shows the attachment structure of a ventilation unit. It is a cross-sectional view which shows the horizontal direction connection structure of a ventilation unit. It is sectional drawing which shows the drainage channel structure of an inner wall. It is sectional drawing which shows another Example of a ventilation unit. It is sectional drawing which shows another Example of ventilation structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ventilation unit 2 Ventilation opening 9 Shape-retaining frame 9a Vertical frame 9c of a shape-retaining frame Lower horizontal frame 10 Shape-retaining frame Outer louver frame 11 Center louver frame 12 Inner louver frame 21 First wall 22 Second wall 23 First 3 walls 28 outer base wall 29 inner base wall 30 bent wall 31 first reversing portion 32 second reversing portion 45 mounting bracket 52 inner collar 54 drainage channel 62 heater B roof base T ventilation path T1 first path T2 second path T3 second 3 routes

Claims (7)

It is equipped with a ventilation unit 1 that stands and faces the ventilation opening 2,
The ventilation unit 1 includes a shape retaining frame 9 assembled in a quadrangular shape, a group of outer louver frames 10 assembled to the shape retaining frame 9 in a multistage array, and a linear array on the inner surface of the outer louver frame 10. A group of central louver frames 11 and a group of inner louver frames 12 assembled in an inner surface of the central louver frame 11 in a multi-stage manner,
Both the inner and outer louver frames 10 and 12 and the central louver frame 11 are adjacently arranged in the inner and outer directions in a state of intersecting vertically and horizontally,
The ventilation path T that passes through each louver frame 10, 11, 12 is a first path T 1 that is obliquely downward defined by the adjacent outer louver frame 10, and the middle part defined by the adjacent central louver frame 11 is bent. A ventilation structure for buildings, characterized in that it is composed of two paths T2 and a third path T3 obliquely upward defined by the adjacent inner louver frame 12. The first louver frame 10 and the inner louver frame 12 are received by the vertical frame 9a of the shape retaining frame 9, respectively, the second wall 22 contacting the central louver frame 11, and the first and first walls, respectively. Formed of an aluminum material having an irregular cross section including an oblique third wall 23 connecting the two walls 21 and 22;
The ventilation structure for buildings according to claim 1, wherein the outer louver frame (10) and the inner louver frame (12) are fixed to the shape-retaining frame body (9) with the third walls (23) of both (10, 12) inclined in an inverted C shape. .   The ventilation structure for buildings according to claim 2, wherein an entrance and an exit of the second path T2 are defined by a second wall 22 facing inward and outward with the central louver frame 11 in between. The upper surface of the ventilation opening 2 is covered with a pair of ventilation units 1 assembled in an inverted V shape,
The ventilation structure for buildings according to claim 1, 2 or 3, wherein the lower horizontal frame 9c of the shape retaining frame 9 of each ventilation unit 1 is fastened and fixed to a mounting bracket 45 fixed to the roof base B. Between the shape retaining frame 9 of each ventilation unit 1 facing the ventilation opening 2 and the roof base B, an inner collar 52 for receiving condensed water is arranged,
The ventilation structure for a building according to claim 4, wherein the drainage channel 54 led out from the inner wall 52 faces the outer surface of the roof material 56.   The building ventilation structure according to claim 4 or 5, wherein a snow melting heater (62) is disposed inside a lower horizontal frame (9c) formed of a hollow aluminum strip. The central louver frame 11 integrally includes an outer base wall 28 and an inner base wall 29 that receive the outer louver frame 10 and the inner louver frame 12, and a bent wall 30 having a square cross section that connects the base walls 28 and 29. And
A first reversing portion 31 for reversing and guiding the air flow passing through the second path T2 and a second reversing portion 32 are formed on the outer surface of the bent portion of the bent wall 30 and the inner surface of the end portion of the inner base wall 29, respectively. The ventilation structure for buildings according to any one of claims 1 to 6.

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