JP7488563B2 - Ventilation hood, ventilation hood unit, and method for assembling the ventilation hood unit - Google Patents

Description

Patent Law Article 30, Paragraph 2 applied. Pamphlet published on September 14, 2020.

The present invention relates to a ventilation hood, a ventilation hood unit, and a method for assembling a ventilation hood unit.

For example, the exterior wall terminal ventilation opening described in Patent Document 1 comprises a cylindrical section connected to a duct, a base section provided on the exterior wall surface outside the cylindrical section, a hood section that surrounds the front surface of the base section and has openings at the top and bottom, and a straightening plate provided inside the hood section. The straightening plate is configured to have a shape that descends from the upper end of the base section toward the front inner surface of the hood section, with its lower end below the center of the cylindrical section and forming a first gap between it and the front inner surface of the hood section.

JP 2008-89264 A

In the configuration described in Patent Document 1 above, there is a risk that the wind blowing up from below will be blocked by the baffle plate and will flow back into the duct.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a ventilation hood, a ventilation hood unit, and a method for assembling a ventilation hood unit that can prevent wind from flowing back into the duct.

In order to achieve the above object, a ventilation hood according to a first aspect of the present invention comprises a hood section having a cavity penetrating in an air passage direction extending in a straight line , a straightening plate provided within the cavity of the hood section and formed in a plate shape that moves away from a wall surface in the air passage direction as it moves away from an air flow discharge source that discharges an air flow, and which divides the air flow discharged from the air flow discharge source into two , an upper side and a lower side in the air passage direction, and discharges the air flow to the outside of the hood section, and and one air passage member, wherein the air straightening plate is in the form of a plate curved along the air passage direction so as to bulge toward the air flow discharge source, the hood portion has a ceiling portion positioned to cover the air straightening plate from the opposite side of the air flow discharge source, and an air passage space through which air passes along the air passage direction is formed between the ceiling portion and the air straightening plate, and an air passage hole is formed in the first air passage member, positioned opposite the air passage space in the air passage direction and positioned in the tangential direction of the end of the air straightening plate close to the first air passage member.
In order to achieve the above-mentioned object, a ventilation hood according to a second aspect of the present invention comprises a hood section having a cavity penetrating in an air passage direction extending in a straight line, a straightening plate provided within the cavity of the hood section and formed in a plate shape that moves away from a wall surface as it moves away from an airflow discharge source that discharges an airflow in the air passage direction, and divides the airflow discharged from the airflow discharge source into two, an upper side and a lower side in the air passage direction, and discharges it to the outside of the hood section, and a second air passage member covering a second opening that opens toward the lower side of the hood section in the air passage direction, wherein the second air passage member comprises a plurality of blades that intersect with the air passage direction and are arranged along a width direction along the wall surface, extend along a direction intersecting with the air passage direction and the width direction, and are inclined with respect to the air passage direction, and a first blade and a second blade among the plurality of blades are inclined with respect to the air passage direction in different directions from each other.

In order to achieve the above object, a ventilation hood unit according to a third aspect of the present invention comprises: a hood section having a cavity penetrating in an air passage direction extending in a straight line; and a ventilation hood having a straightening plate provided within the cavity of the hood section and formed in a plate shape that moves away from a wall surface in the air passage direction as it moves away from an airflow discharge source that discharges an airflow, and that divides the airflow discharged from the airflow discharge source into two, an upper side and a lower side, in the air passage direction and discharges the airflow to the outside of the hood section; and a wall surface fixing plate through which a tip of a duct which is the airflow discharge source passes while being fixed to the wall surface and to which the ventilation hood is attached, the wall surface fixing plate being fixed to the wall surface and having a straightening plate that moves away from the wall surface. The ventilation hood has a first engagement portion located on the upper side of a fixing plate, the ventilation hood has a second engagement portion located on the upper side of the ventilation hood and hooked from above onto the first engagement portion of the wall fixing plate, the lower side of the ventilation hood is fixed to the wall fixing plate by a screw, the first engagement portion has a hole portion that penetrates in the air passage direction and into which the second engagement portion fits, the second engagement portion extends along the air passage direction and is formed as a hook that fits into the hole portion of the first engagement portion, and the tip of the second engagement portion is formed at an angle so as to approach the wall fixing plate as it approaches the wall fixing plate, and is formed so that its width becomes narrower as it approaches the wall fixing plate.

In order to achieve the above-mentioned object, a method of assembling a ventilation hood unit according to a fourth aspect of the present invention includes a first step of hooking the second engagement portion of the ventilation hood onto the first engagement portion of the wall fixing plate, a second step of bringing the underside of the ventilation hood close to or into contact with the underside of the wall fixing plate after the first step, in a state in which the ventilation hood is capable of rotating relative to the wall fixing plate around the periphery of the first engagement portion and the second engagement portion, and a third step of fixing the underside of the ventilation hood to the underside of the wall fixing plate with the screw after the second step.

According to the present invention, the ventilation hood, ventilation hood unit, and ventilation hood unit assembly method can prevent wind from flowing back into the duct.

FIG. 1 is a perspective view of a ventilation hood unit according to one embodiment of the present invention. FIG. 1 is a perspective view of a ventilation hood unit according to one embodiment of the present invention. FIG. 2 is a perspective view of a wall fixing plate according to an embodiment of the present invention. FIG. 1 is a perspective view of a ventilation hood according to an embodiment of the present invention. 5 is a cross-sectional view taken along line 5-5 of FIG. 1. FIG. 2 is a perspective view of a hook and a hook engaging portion according to an embodiment of the present invention. FIG. 2 is a partial perspective view of a hood portion according to one embodiment of the present invention. 10 is a schematic diagram showing a state in which a hook according to an embodiment of the present invention is engaged with a hook engaging portion. FIG. (a) of one embodiment of the present invention is a cross-sectional view when the hook is engaged with the hook engaging portion, and (b) is a cross-sectional view when the ventilation hood is rotated relative to the wall mounting plate with the hook engaged with the hook engaging portion.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a ventilation hood, a ventilation hood unit, and a method of assembling a ventilation hood unit according to the present invention will be described with reference to the drawings.
As shown in FIG. 1 , the ventilation hood unit 15 includes a wall mounting plate 20 that is fixed to an outer wall surface Wl, and a ventilation hood 10 that is attached to the wall mounting plate 20.
As shown in FIG. 3, the wall fixing plate 20 is located on the outer periphery of the duct D and is fixed to the outer wall surface Wl.
In detail, the wall fixing plate 20 includes a main body portion 23 , a side wall portion 29 , hook fitting portions 21 , 22 , a duct biasing portion 24 , a duct holding portion 25 , and a guide plate 27 .

The main body 23 is rectangular, and in this example, has a plate shape that is approximately square. A duct passage hole 23a is formed in the center of the main body 23, through which the cylindrical duct D passes. The duct passage hole 23a is circular and surrounds the duct D. The side wall 29 extends from the outer peripheral edge of the main body 23 toward the outer wall surface Wl. As shown in FIG. 5, a heat insulating material 28 is provided on the back surface of the main body 23 that faces the outer wall surface Wl. The heat insulating material 28 is plate-shaped, the outer periphery of which is surrounded by the side wall 29, and has a through hole through which the duct D passes. The heat insulating material 28 is formed, for example, from a foamed resin.

3, the duct holding portion 25 extends along the periphery of the duct passing hole 23a and has a curved plate shape perpendicular to the main body portion 23. The duct holding portion 25 is located below the duct passing hole 23a and supports the lower part of the outer circumferential surface of the duct D.
The multiple duct biasing parts 24 (two in this example) are elastic plate-like extending radially inward of the duct passing hole 23a on the periphery of the duct passing hole 23a. The two duct biasing parts 24 are provided below the hook fitting parts 21, 22, respectively. The duct biasing parts 24 elastically press the outer peripheral surface of the duct D toward the duct holding part 25. The multiple duct biasing parts 24 and the duct holding part 25 fix the duct D in the duct passing hole 23a of the main body part 23.

As shown in FIG. 3, the main body 23 has a plurality of screw passage holes 23b through which screws (not shown) can pass for fixing the wall fixing plate 20 to the outer wall surface Wl. The plurality of screw passage holes 23b are arranged on both edges extending along the height direction H of the main body 23. Two screw passage holes 23b are arranged on each of the two edges.

The main body 23 is also formed with a number of screw passing holes 23c through which the screws 90 (see FIG. 1) for fixing the ventilation hood 10 to the wall fixing plate 20 can pass. The screw passing holes 23c are arranged at the bottom of both edges extending along the height direction H of the main body 23. One screw passing hole 23c is provided at each of the lower corners of the main body 23. The screw passing holes 23c are formed in the bottom surface of a recess 23d of the main body 23. The recess 23d is recessed toward the ventilation hood 10.

3, the hook fitting portions 21, 22 are portions onto which hooks 81, 82 (described later, see FIG. 4) of the ventilation hood 10 are hooked. The hook fitting portions 21, 22 are provided on a surface of the main body 23 that faces the ventilation hood 10.
The hook fitting portions 21, 22 are provided near two corners (upper corners) of the main body 23 that are far from the screw passage hole 23c in the height direction H. The hook fitting portions 21, 22 are trapezoidal in shape with their long sides omitted when viewed from the height direction H, and have holes that penetrate in the height direction H. The holes are formed so that the hooks 81, 82 can be fitted into them.

More specifically, as shown in Fig. 6, the hook fitting portion 22 includes a main body wall portion 22a and two side walls 22b and 22c. When viewed from the height direction H, the hook fitting portion 22 is trapezoidal. The main body wall portion 22a forms the upper short side of this trapezoidal shape, and the side walls 22b and 22c form the inclined side sides of this trapezoidal shape. The side walls 22b and 22c are connected to both ends of the main body wall portion 22a in the width direction W so as to support the main body wall portion 22a at a position away from the surface of the main body portion 23. The side walls 22b and 22c are arranged at positions away from each other in the width direction W. The side walls 22b and 22c are plate-shaped and inclined in the width direction W from the surface of the main body portion 23 toward the end of the main body wall portion 22a. One end of each of the side walls 22b, 22c is fixed to the surface of the main body 23, and the other end of each of the side walls 22b, 22c is connected to an end of the main body wall 22a in the width direction W. The distance between the two side walls 22b, 22c increases as they approach the surface of the main body 23. This makes it easy for the hook 82 to be inserted into the hole between the side walls 22b, 22c.
The hook fitting portion 21 has a shape similar to that of the hook fitting portion 22, and includes a main body wall portion 21a and two side wall portions 21b and 21c.

As shown in FIG. 3, the guide plate 27 is fixed to the lower end of the main body 23 and guides rainwater or condensation water that falls from the tip of the duct D in a direction away from the outer wall surface Wl. The guide plate 27 is a rectangular plate that is long in the width direction W and is inclined so as to move away from the outer wall surface Wl as it moves downward. Both ends of the guide plate 27 in the width direction W are formed so as to be folded back to the front side.

As shown in FIG. 1, the ventilation hood 10 is a member that is attached to a wall mounting plate 20. As shown in FIG. 4, the ventilation hood 10 includes a first air passage member 40, a second air passage member 30, a hood section 50, a straightening plate 70, and hooks 81 and 82.

As shown in Figures 1 and 2, the hood section 50 is shaped to surround the cavity at the tip side of the duct D. The hood section 50 is generally semi-cylindrical and extends in the height direction H. The hood section 50 is configured to penetrate in the height direction H so that wind that may contain rain or snow can pass through in the height direction H, which is the wind passing direction.

More specifically, as shown in FIG. 1 , the hood portion 50 includes a ceiling portion 51 , side walls 52 , 53 , 56 , 57 , and flange portions 54 , 55 .
The ceiling portion 51 is curved so as to bulge in a direction away from the outer wall surface Wl when viewed from the height direction H, and is formed in a plate shape extending in the height direction H.
The side walls 52, 53 extend in a wall surface perpendicular direction Z intersecting with the outer wall surface Wl and in a height direction H. The side walls 52, 53 are arranged facing each other in the width direction W. An end of the side wall 52 remote from the outer wall surface Wl is fixed to a first end of the ceiling 51 in the width direction W. An end of the side wall 53 remote from the outer wall surface Wl is fixed to a second end of the ceiling 51 in the width direction W.

The flanges 54, 55 are portions fixed to the wall fixing plate 20 by screws 90. The flanges 54, 55 are fixed to ends of the side walls 52, 53 close to the outer wall surfaces Wl, respectively, and extend outside the ventilation hood 10 in the width direction W. The flanges 54, 55 are rectangular plate-shaped and long in the height direction H, and contact the surface of the main body 23 of the wall fixing plate 20 (see FIG. 3).
1 and 4, screw through holes 54a, 55a into which the shank of the screw 90 is screwed are formed on the sides (lower sides) of the flanges 54, 55 farther from the hooks 81, 82. As shown enlarged in the lower part of FIG. 1, the screw through hole 54a has a plurality of (e.g., three) contact portions 54a1 formed on the inner peripheral edge of the screw through hole 54a at equal angular intervals (e.g., 120° intervals) and in a convex shape toward the shank of the screw 90. The plurality of contact portions 54a1 come into contact when the shank of the screw 90 is screwed. The screw through hole 55a has the same shape as the screw through hole 54a and has a plurality of contact portions.

As shown in FIG. 1, the side walls 56, 57 are located at the outer ends of the flanges 54, 55 in the width direction W, and extend toward the outer wall surface Wl. The side walls 56, 57 are perpendicular to the flanges 54, 55, and are rectangular plates that are long in the height direction H. The side walls 56, 57 contact or face the side walls 29 (see FIG. 3) of the wall fixing plate 20. The ventilation hood 10 is positioned in the width direction W relative to the wall fixing plate 20 by the side walls 56, 57 contacting or facing the side walls 29 of the wall fixing plate 20.

As shown in Fig. 7, a recessed step portion 50a is formed over the entire upper end of the outer surface of the hood portion 50. A mating edge portion 42 (see Fig. 1), which will be described later, of the first air-passing member 40 fits into the step portion 50a. The mating edge portion 42 fits into the step portion 50a so as to be flush with the outer surface of the ceiling portion 51. The mating edge portion 42 fits into the step portion 50a, so that the first air-passing member 40 can be securely fixed to the hood portion 50, and the intrusion of wind through a gap between the hood portion 50 and the first air-passing member 40 is suppressed.
The step portion 50a includes a central positioning recess 50b located in the ceiling portion 51 and a side positioning recess 50c located in the sidewall portions 56, 57. The central positioning recess 50b is located in the center of the ceiling portion 51 in the width direction W, and the fitting protrusion 42a (see FIG. 1) of the fitting edge portion 42 fits into the central positioning recess 50b. The side positioning recess 50c is located near the outer wall surface Wl of the sidewall portions 56, 57, and the fitting protrusion 42b (see FIG. 1) of the fitting edge portion 42 fits into the side positioning recess 50c.

As shown in Figures 4 and 5, the straightening plate 70 is fixed inside the hood portion 50 and has the function of branching the airflow from the tip (airflow discharge source) of the duct D into two in the height direction H and discharging it outside the hood portion 50.
The straightening vane 70 is curved so as to bulge toward the tip of the duct D when viewed from the width direction W, and extends along the width direction W. In other words, the straightening vane 70 becomes farther away from the outer wall surface Wl as it moves away from the tip of the duct D in the height direction H. For example, the radius of curvature of the straightening vane 70 is set to 74.5 mm.
5, an apex P1 of the straightening plate 70 is positioned so as to face the center position of the duct D in the wall surface perpendicular direction Z. The straightening plate 70 forms an air passage space Sp1 between itself and the ceiling portion 51, through which air can pass in the height direction H. In addition, the straightening plate 70 forms a straightening space Sp2 between itself and the wall fixing plate 20, through which the airflow from the tip of the duct D is branched in the height direction H and discharged from the top and bottom of the ventilation hood 10. Wind from outside can also pass through the straightening space Sp2 in the height direction H.
The upper end of the straightening plate 70 is positioned opposite the first air passage member 40 in the height direction H. An air passage hole 41 (described later) of the first air passage member 40 is positioned in a tangential direction S1 of the upper end of the straightening plate 70. The lower end of the straightening plate 70 is positioned opposite the second air passage member 30 in the height direction H.

As shown in FIG. 4, the straightening plate 70 has fixed ends 71 at both ends in the width direction W that are fixed to the inner surfaces of the side walls 52, 53 of the hood portion 50. The fixed ends 71 extend along the side walls 52, 53 and contact the inner surfaces of the side walls 52, 53. The fixed ends 71 extend toward the outer wall surface Wl and are fixed to the inner surfaces of the side walls 52, 53 by welding, such as spot welding.

As shown in FIG. 2, the second air passage member 30 is formed to cover the opening on the first end (lower end) side of the hood section 50. The second air passage member 30 is fixed to the lower end of the inner surface of the hood section 50. The second air passage member 30 has a plurality of blades 31, 32, and is configured as a louver in which the plurality of blades 31, 32 are arranged. In this example, the plurality of blades 31, 32 are arranged along the width direction W, and each extends along the wall surface perpendicular direction Z. The plurality of blades 31, 32 have the function of preventing wind from blowing into the ventilation hood 10 from the outside, and the function of straightening the airflow from the straightening plate 70.

The multiple vanes 31, 32 are each inclined with respect to the height direction H. The multiple vanes 31 and the multiple vanes 32 are inclined in different directions. The multiple vanes 31 are arranged on one side (right side in FIG. 2) from the center of the width direction W of the second air passage member 30, and the multiple vanes 32 are arranged on the other side (left side in FIG. 2) from the center of the width direction W of the second air passage member 30. The multiple vanes 31 are inclined toward one side (right side in FIG. 2) as they move downward. The multiple vanes 32 are inclined toward the other side (left side in FIG. 2) as they move downward.

1 , the first air passage member 40 has a plate shape extending along the width direction W and the wall surface perpendicular direction Z so as to cover the opening on the second end (upper end) side of the hood portion 50. The first air passage member 40 includes a main body plate portion 43 and a fitting edge portion 42.
When viewed from the height direction H, the main body plate portion 43 has a rectangular shape that is long in the width direction W, with one long side thereof bulging in a curved manner along the ceiling portion 51.
The main body plate portion 43 has air passage holes 41 formed therein as through holes. The air passage holes 41 are formed near the ceiling portion 51 of the main body plate portion 43. The air passage holes 41 are formed in substantially the entire area of a substantially semicircular portion of the main body plate portion 43 near the ceiling portion 51. The air passage holes 41 are positioned opposite the air passage space Sp1 (see FIG. 5 ) between the straightening plate 70 and the ceiling portion 51 in the height direction H. No through holes are formed in the portion of the main body plate portion 43 facing the straightening space Sp2 in the height direction H.

As shown in FIG. 1, the main body plate portion 43 has partition bridge portions 41a, 41b, 41c, and 41d that pass through the air passage hole 41. The partition bridge portion 41d extends along the width direction W and is located at the center of the air passage hole 41 in the wall surface perpendicular direction Z. The partition bridge portions 41a, 41b, and 41c extend along the wall surface perpendicular direction Z and are arranged in the width direction W. The partition bridge portions 41a, 41b, 41c, and 41d increase the strength of the ventilation hood 10 and prevent foreign objects such as fallen leaves from entering the air passage space Sp1 or the straightening space Sp2. The partition bridge portions 41a, 41b, 41c, and 41d also have the function of straightening the airflow from the straightening plate 70.

As shown in FIG. 1, the fitting edge 42 is formed along the edge of the underside of the main body plate 43, excluding the outer wall surface Wl side, so as to fit into the step portion 50a (see FIG. 7). The fitting edge 42 extends downward perpendicular to the main body plate 43. A fitting protrusion 42a that fits into the central positioning recess 50b is formed in the center of the fitting edge 42 in the width direction W. A fitting protrusion 42b that fits into the side positioning recess 50c is formed on both ends of the fitting edge 42 in the width direction W.

As shown in Fig. 4, the hooks 81, 82 are hooked onto the hook fitting portions 21, 22 (see Fig. 3) of the wall fixing plate 20 in order to temporarily fix the ventilation hood 10 to the wall fixing plate 20. The hooks 81, 82 are fixed to the outer wall surface side of the lower surface of the first air passage member 40. The hooks 81, 82 are provided on both ends in the width direction W of the lower surface of the first air passage member 40. The hooks 81, 82 are curved so as to approach the outer wall surface as they go downward.
6, the hook 82 has a base end 82a and a tip end 82b. The base end 82a is fixed to the lower surface of the first hollow member 40 and extends in a height direction H. The length W1 of the base end 82a in a width direction W is formed to be constant.
The tip portion 82b is connected to the lower side of the base portion 82a, and is inclined so as to approach the surface of the main body portion 23 as it approaches the lower end of the tip portion 82b. The length W1 of the tip portion 82b in the width direction W is formed to become smaller as it approaches the lower end of the tip portion 82b. As a result, the hook 82 is formed to be tapered in the width direction W.
The hook 81 has a shape similar to that of the hook 82, and includes a base end 81a and a tip end 81b.

Next, a description will be given of a method for assembling the ventilation hood unit 15. This assembly work is performed by an operator.
First, as shown in Fig. 3, the wall fixing plate 20 is fixed to the outer wall surface Wl. Specifically, the tip of the duct D protruding from the outer wall surface Wl is inserted into the duct passing hole 23a, and the wall fixing plate 20 is brought into contact with the outer wall surface Wl. Then, screws (not shown) are screwed into the multiple screw passing holes 23b of the wall fixing plate 20 to fix the wall fixing plate 20 to the outer wall surface Wl.

Then, the hooks 81, 82 of the ventilation hood 10 are fitted into the hook fittings 21, 22 of the wall fixing plate 20, thereby temporarily fixing the ventilation hood 10 to the wall fixing plate 20. Specifically, as shown in FIG. 8, the hooks 81, 82 are brought close to the hook fittings 21, 22 from above, and the tips 81b, 82b of the hooks 81, 82 are brought into contact with the upper ends of the body walls 21a, 22a of the hook fittings 21, 22. Furthermore, by moving the ventilation hood 10 downward, the inclination of the tips 81b, 82b of the hooks 81, 82 guides the ventilation hood 10 to approach the wall fixing plate 20 in the wall perpendicular direction Z. This causes the hooks 81, 82 to fit into the hook fittings 21, 22. In this fitted state, as shown in Fig. 6, the base ends 81a, 82a of the hooks 81, 82 are positioned opposite the main body walls 21a, 22a of the hook fitting parts 21, 22 with a gap therebetween. At this time, as shown in Fig. 5 and Fig. 9(a), the end of the first air-passing member 40 close to the outer wall surface Wl rests on the side wall 29 of the wall fixing plate 20 at position P2. Position P2 is a peripheral position of the hooks 81, 82 and the hook fitting parts 21, 22. In this state, as shown by the arrow F in Fig. 5, the ventilation hood 10 is configured to be rotatable about position P2 relative to the wall fixing plate 20. In other words, as shown in Figures 9(a) and 9(b), the gap between the base ends 81a, 82a of the hooks 81, 82 and the main body walls 21a, 22a of the hook fitting parts 21, 22 and the inclination angles of the tips 81b, 82b of the hooks 81, 82 are adjusted so that the ventilation hood 10 can rotate around position P2 relative to the wall fixing plate 20. When the ventilation hood 10 is rotated along the arrow F in Figure 5 so as to move away from the wall fixing plate 20, the main body walls 21a, 22a of the hook fitting parts 21, 22 are positioned so as to face the tips 81b, 82b of the hooks 81, 82, as shown in Figure 9(b). The worker can adjust the orientation of the ventilation hood 10 relative to the wall fixing plate 20 by rotating the ventilation hood 10 along the arrow F in Figure 5. This makes it easier to align the screw holes 54a, 55a (see Figure 4) of the ventilation hood 10 with the screw holes 23c (see Figure 3) of the wall mounting plate 20.

Finally, as shown in FIG. 1, the ventilation hood 10 is fixed to the wall mounting plate 20 by screwing the screws 90 into the screw holes 54a, 55a and the screw through hole 23c. This completes the assembly of the ventilation hood unit 15.

Next, the operation of the ventilation hood 10 will be described.
First, the operation of the ventilation hood 10 when airflow is discharged from the tip of the duct D will be described.
As shown by arrow G1 in Fig. 5, when airflow is discharged from the tip of duct D, this airflow hits the vicinity of apex P1 of the straightening vane 70 and is branched in the height direction H along the curvature of the straightening vane 70 as shown by arrows G2 and G3 in Fig. 5. As this branched airflow advances in the height direction H, it is guided by the straightening vane 70 so as to move away from the outer wall surface Wl. This prevents the outer wall surface Wl from being soiled by the airflow.
The first branched airflow along the arrow G2 passes between the blades 31, 32 of the second air passage member 30 and is discharged to the outside, as shown by arrow G4 in Fig. 5. The second branched airflow along the arrow G3 passes through the air passage hole 41 of the first air passage member 40 and is discharged to the outside, as shown by arrow G5 in Fig. 5. The first branched airflow along the arrow G2 flows in the direction of gravity (downward), and therefore has a larger flow rate than the second branched airflow along the arrow G3.

Next, the operation of the ventilation hood 10 when wind blows up from below the ventilation hood 10 will be described.
5, the wind passes through the gaps between the blades 31, 32 and enters the wind passing space Sp1, and is then discharged to the outside through the air passing holes 41 of the first air passage member 40. Even if the wind enters the straightening space Sp2 from the gaps between the blades 31, 32, the wind is guided by the straightening plate 70 and passes through the straightening space Sp2 to be discharged to the outside through the air passing holes 41 of the first air passage member 40. In this way, the wind passes through the ventilation hood 10, and thus the generation of noise by the ventilation hood 10 due to the wind is suppressed.

When rain, snow, or other foreign matter falls on the top surface of the first air passage member 40, the foreign matter passes through the air passage hole 41 of the first air passage member 40, passes through the air passage space Sp1, and passes through the gaps between the multiple blades 31, 32, and is discharged to the outside. This prevents the foreign matter from entering the duct D.

The inventors of the present application conducted an experiment to visualize the flow of airflow discharged from the tip of the duct D in the configuration of this embodiment in which the blades 31, 32 extend along the wall surface perpendicular direction Z, and in a comparative example in which the blades extend along the width direction. As a result, it was found that the airflow discharged from the gap between the blades 31, 32 is more likely to leave the outer wall surface Wl in the configuration of this embodiment than in the comparative example. Therefore, in the configuration of this embodiment, the outer wall surface Wl is less likely to be soiled by the airflow than in the comparative example.

(effect)
According to the embodiment described above, the following effects are achieved.
(1) The ventilation hood 10 comprises a hood section 50 having a cavity penetrating in a height direction H, which is an example of an air passage direction, and a straightening plate 70 that is provided in the cavity of the hood section 50 and is formed in a plate shape that moves away from the outer wall surface Wl in the height direction H as it moves away from the tip of a duct D, which is an example of an airflow discharge source that discharges airflow, and that divides the airflow discharged from the tip of the duct D into two along the height direction H and discharges it to the outside of the hood section 50.
According to this configuration, even when wind blows into the ventilation hood 10 along the height direction H, the straightening plate 70 passes the wind through the straightening space Sp2 between the front end of the duct D and the straightening plate 70, and exhausts the wind to the outside of the ventilation hood 10. Thus, it is possible to prevent the wind from flowing back into the duct D.
In addition, the airflow discharged from the tip of the duct D is divided into two along the height direction H by the straightening plate 70, and each of the two divided airflows is discharged to the outside from the ventilation hood 10 in a direction away from the outer wall surface Wl. This prevents the outer wall surface Wl from being soiled by the airflow.
In addition, since the straightening plate 70 divides the airflow discharged from the tip of the duct D into two along the height direction H, the flow rate of each airflow can be reduced, thereby preventing the outer wall surface Wl from becoming dirty due to the airflow.

(2) The hood portion 50 includes the ceiling portion 51 located so as to cover the airflow straightening plate 70 from the opposite side to the tip of the duct D. Between the ceiling portion 51 and the airflow straightening plate 70, an air passage space Sp1 through which air passes in the height direction H is formed.
According to this configuration, the wind passes through the ventilation hood 10 in the height direction H via the air passage space Sp1, so that the wind can be prevented from flowing back into the duct D.
In addition, since the straightening plate 70 is covered by the ceiling portion 51, the design of the ventilation hood 10 can be improved.

(3) The ventilation hood 10 includes a first air passage member 40 that covers a first opening that opens upward in the height direction H of the hood portion 50. The first air passage member 40 has an air passage hole 41 that is positioned opposite the air passage space Sp1 in the height direction H and is located in the tangential direction S1 of the upper end portion of the straightening plate 70 that is close to the first air passage member 40.
According to this configuration, the airflow guided by the straightening plate 70 flows from the upper end of the straightening plate 70 toward the air passage hole 41, and passes through the air passage hole 41 and is discharged to the outside of the ventilation hood 10. Furthermore, when foreign matter such as rain or snow passes through the air passage hole 41 of the first hollow member 40, it passes through the air passage space Sp1 and is discharged to the outside. Therefore, foreign matter such as rain or snow is less likely to enter the straightening space Sp2, and therefore the foreign matter is prevented from entering the duct D.

(4) The ventilation hood 10 includes a second air passage member 30 that covers a second opening that opens downward in the height direction H of the hood portion 50. The second air passage member 30 includes a plurality of blades 31, 32 that are arranged along the width direction W, extend along the height direction H and a wall surface vertical direction Z that is perpendicular to the width direction W, and are inclined with respect to the height direction H. Of the plurality of blades 31, 32, the blade 31 (first blade) and the blade 32 (second blade) are inclined with respect to the height direction H in different directions from each other.
For example, if the blades are inclined in the same direction, when the wind blows in a direction along the blades, a large amount of wind will blow into the ventilation hood 10. According to the above configuration, the blades 31, 32 are inclined in different directions from each other, so that the amount of wind blowing into the ventilation hood 10 can be suppressed.
Additionally, the plurality of blades 31 are inclined toward one side (the right side in FIG. 2) as they extend downward, and the plurality of blades 32 are inclined toward the other side (the left side in FIG. 2) as they extend downward.
According to this configuration, the blades 31 and 32 are oriented in a direction corresponding to the expansion of the air current that collides with the straightening plate 70 and flows toward the blades 31 and 32 , so that the air current can easily pass through the gaps between the blades 31 and 32 .

(5) The ventilation hood unit 15 includes the ventilation hood 10 and a wall fixing plate 20 through which the tip of the duct D passes while being fixed to the outer wall surface Wl and to which the ventilation hood 10 is attached. The wall fixing plate 20 includes hook fitting portions 21, 22 which are an example of a first locking portion located on the upper side of the wall fixing plate 20. The ventilation hood 10 includes hooks 81, 82 which are an example of a second locking portion located on the upper side of the ventilation hood 10 and which hook from above onto the hook fitting portions 21, 22 of the wall fixing plate 20. The lower side of the ventilation hood 10 is fixed to the wall fixing plate 20 by screws 90 (not shown).
According to this configuration, the hooks 81, 82 of the ventilation hood 10 are fitted into the hook fitting portions 21, 22 of the wall fixing plate 20, thereby allowing the ventilation hood 10 to be temporarily fixed to the wall fixing plate 20. With the ventilation hood 10 temporarily fixed to the wall fixing plate 20, an operator can easily perform the work of fixing the ventilation hood 10 to the wall fixing plate 20 with the screws 90. This improves workability.

(6) The hook fitting portions 21, 22 are formed with holes that penetrate in the height direction H and into which the hooks 81, 82 fit. The hooks 81, 82 extend along the height direction H and fit into the holes of the hook fitting portions 21, 22. The tips 81b, 82b of the hooks 81, 82 are formed to be inclined so as to approach the wall fixing plate 20 toward the lower side, and are formed so as to become narrower toward the lower side.
According to this configuration, the tip portions 81b, 82b of the hooks 81, 82 are formed so that the width (length W1 in the width direction W) becomes smaller toward the lower side, so that the hooks 81, 82 can be easily fitted into the hook fitting portions 21, 22. In addition, the tip portions 81b, 82b of the hooks 81, 82 are formed so as to be inclined toward the wall fixing plate 20 toward the lower side, so that the ventilation hood 10 can rotate relative to the wall fixing plate 20 around the position P2 of the hook fitting portions 21, 22 and the hooks 81, 82. Therefore, in the temporarily fixed state, the ventilation hood 10 has play with respect to the wall fixing plate 20, and the operation of aligning the screw through holes 54a, 55a (see FIG. 4) of the ventilation hood 10 with the screw through holes 23c (see FIG. 3) of the wall fixing plate 20 is facilitated.

(7) The method of assembling the ventilation hood unit 15 includes a first step of hooking the hooks 81, 82 of the ventilation hood 10 onto the hook fitting portions 21, 22 of the wall fixing plate 20, a second step of bringing the underside of the ventilation hood 10 close to or into contact with the underside of the wall fixing plate 20, in a state in which the ventilation hood 10 is able to rotate relative to the wall fixing plate 20 around position P2 around the hook fitting portions 21, 22 and the hooks 81, 82 after this first step, and a third step of fixing the underside of the ventilation hood 10 to the underside of the wall fixing plate 20 with screws 90 after this second step.
Conventionally, in a configuration in which a ventilation hood is fixed to a wall mounting plate using only screws, an operator was required to manually position the ventilation hood on the wall mounting plate and then screw in the screws, making it difficult to assemble the ventilation hood to the wall mounting plate.
According to the above configuration, the ventilation hood 10 can be temporarily fixed to the wall mounting plate 20 in the first step, and the screws 90 can be screwed in with the hands removed from the ventilation hood 10, thereby simplifying the assembly work of the ventilation hood 10 to the wall mounting plate 20.

The present invention is not limited to the above-described embodiment and drawings. Modifications (including the deletion of components) can be made as appropriate without departing from the spirit of the present invention. An example of a modification is described below.

(Modification)
In the above embodiment, the ceiling portion 51 was curved so as to bulge in a direction away from the outer wall surface Wl when viewed from the height direction H, but this is not limited to this and the ceiling portion 51 may be formed in a flat plate shape along the height direction H and the width direction W.

The mounting direction of the ventilation hood 10 is not limited to the above embodiment, and for example, the ventilation hood 10 may be fixed to the wall mounting plate 20 with the straightening plate 70 curved along the width direction W.

The shapes of the hooks 81, 82 and the hook fitting portions 21, 22 in the above embodiment may be changed as appropriate. For example, the length W1 of the width direction W of the hooks 81, 82 may be constant. In addition, the tip ends 81b, 82b may extend along the base ends 82a, 82a without being inclined relative to the base ends 82a, 82a.
In the above embodiment, two pairs of hooks 81, 82 and hook fitting portions 21, 22 are provided, but the number of pairs is not limited to this, and for example, one pair or three pairs may be provided.
In addition, in the above embodiment, hooks 81, 82 are provided on the ventilation hood 10 and hook fitting portions 21, 22 are provided on the wall fixing plate 20, but this is not limited to the above, and hook fitting portions 21, 22 may be provided on the ventilation hood 10 and hooks 81, 82 may be provided on the wall fixing plate 20.
In addition, the hooks 81, 82 and the hook fitting portions 21, 22 may be omitted, and the ventilation hood 10 may be fixed to the wall mounting plate 20 entirely by screws.

In the above embodiment, the straightening plate 70 is curved along the height direction H so as to bulge toward the tip of the duct D, but this is not limited thereto. It may be V-shaped as viewed from the width direction W so that the corner is positioned opposite the tip of the duct D, or it may be U-shaped as viewed from the width direction W.

In the above embodiment, the blades 31 and 32 extend along the wall surface perpendicular direction Z, but the present invention is not limited to this and may extend along the width direction W.
The straightening plate 70 in the above embodiment may be omitted.

For example, the technical idea described in the following Supplementary Note 1 is disclosed. Note that Supplementary Note 1 is not to be construed as limiting the present invention in any way.
(Appendix 1)
A method for assembling a ventilation hood unit, comprising the steps of:
A first step of hooking a second engaging portion of the ventilation hood onto a first engaging portion of a wall mounting plate that is fixed to a wall surface;
a second step of bringing a lower side of the ventilation hood into contact with a lower side of the wall mounting plate in a state in which the ventilation hood is rotatable relative to the wall mounting plate around the periphery of the first engaging portion and the second engaging portion after the first step;
and a third step of fixing the lower side of the ventilation hood to the lower side of the wall mounting plate by a screw after the second step.
How to assemble a ventilation hood unit.

10...ventilation hood, 15...ventilation hood unit, 20...wall mounting plate, 21, 22...hook fitting portion, 21a, 22a...main body wall portion, 21b, 21c, 22b, 22c...side wall portion, 23...main body portion, 23a...duct passage hole, 23b, 23c...screw passage hole, 23d...recess, 24...duct bias portion, 25...duct holding portion, 27...guide plate, 28...insulating material, 29...side wall portion, 30...second air passage member, 31, 32...vane, 40...first air passage member, 41...air passage hole, 41a, 41b, 41c, 41d...compartment bridge portion, 42...fitting edge portion, 42a, 42b...fitting protrusion part, 43...main body plate part, 50...hood part, 50a...step part, 50b...central positioning recess, 50c...side positioning recess, 51...ceiling part, 52, 53, 56, 57...side wall part, 54, 55...flange part, 54a, 55a...screw through hole, 54a1...contact part, 70...rectifying plate, 71...fixed end, 81, 82...hook, 81a, 82a...base end, 81b, 82b...tip, 90...screw, D...duct, H...height direction, W...width direction, Z...vertical direction of wall surface, P1...vertex, P2...position, S1...tangential direction, Wl...outer wall surface, Sp1...air passage space, Sp2...rectifying space

Claims (6)

A hood portion having a cavity penetrating in a straight line in the air passage direction;
a straightening plate that is provided in the cavity of the hood portion and is formed in a plate shape that moves away from a wall surface as it moves away from an airflow discharge source that discharges an airflow in the air passage direction, and that divides the airflow discharged from the airflow discharge source into two, an upper side and a lower side in the air passage direction, and discharges the airflow to the outside of the hood portion;
a first air passage member that covers a first opening that opens toward an upper side in the air passage direction of the hood portion ,
The airflow rectifying plate has a plate shape curved along the air passing direction so as to bulge toward the airflow discharge source,
The hood portion includes a ceiling portion positioned so as to cover the airflow straightening plate from the opposite side of the airflow discharge source,
Between the ceiling portion and the airflow straightening plate, an air passage space through which air passes along the air passage direction is formed,
The first air passage member has an air passage hole formed therein, the air passage hole being located opposite the air passage space in the air passage direction and being located in a tangential direction of an end of the straightening plate that is close to the first air passage member.
Ventilation hood. A hood portion having a cavity penetrating in a straight line in the air passage direction;
a straightening plate that is provided in the cavity of the hood portion and is formed in a plate shape that moves away from a wall surface as it moves away from an airflow discharge source that discharges an airflow in the air passage direction, and that divides the airflow discharged from the airflow discharge source into two, an upper side and a lower side in the air passage direction, and discharges the airflow to the outside of the hood portion;
a second air passage member that covers a second opening that opens downward in the air passage direction of the hood portion ,
The second air passage member includes a plurality of blades arranged along a width direction intersecting the air passage direction and along the wall surface, extending along a direction intersecting the air passage direction and the width direction, and inclined with respect to the air passage direction,
Among the plurality of blades, a first blade and a second blade are inclined in different directions with respect to the air passing direction.
Ventilation hood. a hood section having a cavity penetrating in an airflow direction extending in a straight line, and a straightening plate provided in the cavity of the hood section, the straightening plate being formed in a plate shape that moves away from a wall surface as it moves away from an airflow discharge source that discharges an airflow in the airflow direction, and dividing the airflow discharged from the airflow discharge source into two, an upper side and a lower side in the airflow direction, and discharging the airflow to the outside of the hood section;
a wall fixing plate through which an end of the duct, which is the airflow discharge source, passes and to which the ventilation hood is attached in a state where the wall fixing plate is fixed;
The wall fixing plate includes a first engaging portion located on an upper side of the wall fixing plate,
The ventilation hood includes a second engaging portion located above the ventilation hood and hooked from above onto the first engaging portion of the wall surface fixing plate,
The underside of the ventilation hood is fixed to the wall mounting plate by a screw,
The first engaging portion has a hole portion that penetrates in the air passing direction and into which the second engaging portion fits,
The second engaging portion is formed as a hook that extends along the air passage direction and fits into the hole of the first engaging portion,
The tip of the second engaging portion is inclined toward the wall fixing plate toward the lower side, and is formed so as to become narrower in width toward the lower side.
Ventilation hood unit. A method for assembling the ventilation hood unit according to claim 3 , comprising the steps of:
a first step of hooking the second engaging portion of the ventilation hood onto the first engaging portion of the wall mounting plate;
a second step of bringing a lower side of the ventilation hood into contact with a lower side of the wall mounting plate in a state in which the ventilation hood is rotatable relative to the wall mounting plate around the periphery of the first engaging portion and the second engaging portion after the first step;
and a third step of fixing the lower side of the ventilation hood to the lower side of the wall mounting plate by the screw after the second step.
How to assemble a ventilation hood unit. The airflow rectifying plate has a plate shape curved along the air passing direction so as to bulge toward the airflow discharge source,
The hood portion includes a ceiling portion positioned so as to cover the airflow straightening plate from the opposite side of the airflow discharge source,
Between the ceiling portion and the straightening plate, an air passage space through which air passes along the air passage direction is formed.
The fume hood of claim 2 . a first air passage member that covers a first opening that opens toward an upper side in the air passage direction of the hood portion,
The first air passage member has an air passage hole formed therein, the air passage hole being located opposite the air passage space in the air passage direction and being located in a tangential direction of an end of the straightening plate that is close to the first air passage member.
The fume hood of claim 5 .