JP7728075B2 - Exhaust hood - Google Patents

Description

The present invention relates to an exhaust hood that is attached to the exterior wall of a building to prevent wind and rain from entering the room through an exhaust port opening in the exterior wall.

Among combustion devices that burn fuel indoors, there are those that release the exhaust gas generated by combustion indoors, and those that release it outdoors. In combustion devices that release the exhaust gas outdoors, the exhaust gas generated by combustion is guided using an exhaust duct to an exhaust passage that penetrates the wall of the building, and then released outdoors through an exhaust port that opens into the exterior wall. In addition, to prevent wind and rain from entering the room through the exhaust port that opens into the exterior wall, an exhaust hood that covers the exhaust port is attached to the exterior wall at the location where the exhaust port opens.

The exhaust hood consists of a plate-shaped rear plate to which a front cover is attached, covering the front side of the rear plate. The rear plate has a round hole of approximately the same size as the exhaust port, and the front cover is attached to the top and left and right ends of the rear plate, covering the round hole and spaced apart from the rear plate. As a result, the space formed between the rear plate and the front cover is blocked above and to the left and right by the front cover, but is open below.

When attaching an exhaust hood to an exterior wall, the rear panel is attached to the wall with the circular hole in the rear panel aligned with the exhaust port opening in the exterior wall. In this way, the front cover attached to the rear panel prevents wind and rain from reaching the exhaust port, while combustion exhaust emitted from the exhaust port can be discharged downward through the space between the front cover and rear panel. Additionally, by filling the gap between the building's exterior wall and the rear panel of the exhaust hood with caulking material, rain that seeps in through this gap can be prevented from reaching the exhaust port and entering the room through the exhaust port.

However, once the caulking material is filled in, the exhaust hood cannot be easily removed from the exterior wall when it needs to be removed for maintenance, inspection, replacement, etc. Therefore, an exhaust hood has been proposed that allows it to be easily removed from the exterior wall by devising a shape for the area where the caulking material is filled (Patent Document 1).

Japanese Patent Application Laid-Open No. 2009-139057

However, with the conventional exhaust hoods proposed above, when the volume of combustion exhaust air increases, the combustion exhaust can leak through the gap between the front cover and rear plate, soiling the exterior walls of the building. To prevent the combustion exhaust from leaking, sealing flange surfaces are formed on the front cover and rear plate and sealing members are fastened together, but this creates the problem that the sealing members between the flange surfaces are visible from the outside of the exhaust hood, marring its aesthetic appearance.

This invention was made to solve the above-mentioned problems with conventional technology, and aims to provide an exhaust hood that can prevent combustion exhaust from leaking between the front cover and rear panel without compromising the aesthetic appearance.

In order to solve the above-mentioned problems, the exhaust hood of the present invention employs the following configuration:
An exhaust hood includes a rear plate attached to an exterior wall of a building and a front cover attached to the rear plate so as to cover the front of the rear plate, the exhaust hood being attached to the exterior wall to protect an exhaust port that opens into the exterior wall and discharges combustion exhaust gas outdoors from outdoor wind and rain,
The rear plate is
a plate-shaped rear panel main body portion that faces the outer wall when attached to the outer wall;
wall-shaped flange portions extending from the upper end and left and right ends of the rear panel main body portion;
a frame wall portion protruding from an upper end and left and right ends of the front cover toward a position that is outside the flange portion when the front cover is attached to the rear plate;
a compressible seal member is attached to one of an outer surface of the flange portion or an inner surface of the frame wall portion as viewed from the rear panel main body portion, along a direction in which the flange portion or the frame wall portion continues;
When the front cover is attached to the rear plate from the front, either the inner surface of the frame wall portion or the outer surface of the flange portion crosses the sealing member while compressing the sealing member between the outer surface of the flange portion and the inner surface of the frame wall portion, thereby covering the sealing member.

In the exhaust hood of the present invention described above, wall-like flanges extend from the upper and left and right ends of the rear panel main body of the plate-shaped rear panel, and frame walls protrude from the upper and left and right ends of the front cover attached to the rear panel toward the rear panel. A sealing member is affixed to either the outer surface of the flanges or the inner surface of the frame wall. When the front cover is attached to the rear panel, either the inner surface of the front cover's frame wall or the outer surface of the rear panel's flange crosses the sealing member while compressing it between the inner surface of the frame wall and the outer surface of the flange, thereby covering the sealing member.

In this way, the gap between the rear plate and the front cover is sealed by the sealing member compressed between the flanges erected from the top and left and right edges of the rear plate and the frame wall portions erected from the top and left and right edges of the front cover, preventing combustion exhaust from leaking out from this area. Furthermore, when the front cover is attached to the rear plate, the sealing member is covered by the frame wall portions of the front cover, so the sealing member is not visible from the outside and does not detract from the aesthetic appearance of the exhaust hood.

Furthermore, in the exhaust hood of the present invention described above, when a sealing member is attached to the outer surface of the flange portion, a convex portion shorter than the thickness of the sealing member may be provided to protrude from the outer surface forward of the position where the sealing member is attached. Conversely, when a sealing member is attached to the inner surface of the frame wall portion, a convex portion shorter than the thickness of the sealing member may be provided to protrude from the inner surface rearward of the position where the sealing member is attached.

This allows for easy attachment to the flange by simply attaching the sealing member. Furthermore, because the protrusions are shorter than the thickness of the sealing member, they do not interfere with compressing the sealing member to attach the front cover. Additionally, the portion where the sealing member is attached to the flange of the rear plate has a protrusion protruding forward (toward the front cover), while the portion where the sealing member is attached to the frame wall of the front cover has a protrusion protruding backward (toward the rear plate). Therefore, when attaching the front cover, the protrusions protect the sealing member from the leading edge of the frame wall of the front cover or the leading edge of the flange of the rear plate, preventing the leading edge of the frame wall of the front cover or the leading edge of the flange of the rear plate from abutting the sealing member near the portion where the sealing member is attached. This prevents the sealing member from being peeled off by the leading edge of the frame wall of the front cover or the frame wall of the rear plate when attaching the front cover.

Furthermore, in the exhaust hood of the present invention in which a protrusion is provided on the outer surface of the flange portion or the inner surface of the frame wall portion, the protrusion may be formed into a wedge shape whose height decreases as it moves away from the sealing member.

In this way, even if the front cover becomes misaligned with the rear plate when being attached to the rear plate and the leading edge of the frame wall or flange abuts against the protrusion, the wedge-shaped protrusion can correct the misalignment of the front cover, allowing the front cover to be attached properly.

In addition, in the exhaust hood of the present invention described above, a sealing member may be attached to either the outer surface of the flange portion or the inner surface of the frame wall portion, and a protrusion having a thickness smaller than the sealing member may be provided on the other of the outer surface of the flange portion or the inner surface of the frame wall portion.

In this way, when attaching the front cover to the rear plate, the tip of either the outer or inner surface abuts the convex portion before the tip of the other of the outer or inner surface abuts the sealing member. This protects the sealing member from the convex portion, preventing the sealing member from being peeled off by the tip of the frame wall of the front cover or the frame wall of the rear plate when attaching the front cover.

Furthermore, in the exhaust hood of the present invention described above, if the convex portion protrudes from the outer surface of the flange portion, the shape of the convex portion may be wedge-shaped, with the height decreasing toward the front. Conversely, if the convex portion protrudes from the inner surface of the frame wall portion, the shape of the convex portion may be wedge-shaped, with the height decreasing toward the rear.

In this way, even if the front cover is misaligned with the rear plate when being attached to the rear plate and the leading edge of the frame wall or flange abuts against a protrusion, the wedge-shaped protrusion can correct the misalignment of the front cover, allowing the front cover to be attached properly.

In addition, in an exhaust hood of the present invention in which the sealing member is attached to the outer surface of the flange portion, when the front cover is attached to the rear plate, the portion of the sealing member that abuts the front cover is deformed rearward. Therefore, the sealing member may be attached to the outer surface of the flange portion in the following position. In other words, the sealing member may be attached to a position where the distance from the rear end of the sealing member attached to the outer surface of the flange portion to the rear end of the flange portion is greater than the amount of rearward deformation of the portion of the sealing member that abuts the front cover when the front cover is attached.

This prevents the deformed sealing member from protruding from the frame wall of the front cover when the front cover is attached to the rear plate, ensuring that the aesthetic appearance of the exhaust hood is not marred.

FIG. 2 is an exploded view showing the structure of the exhaust hood 1 of the present embodiment. 1 is an explanatory diagram showing an exhaust hood 1 of this embodiment attached to the exterior wall 2 of a building. This is an explanatory diagram showing why, in a sealing member mounting structure in which the direction in which the front cover is attached to the rear plate coincides with the direction in which the front cover compresses the sealing member, the sealing member is visible and the aesthetic appearance of the exhaust hood is marred. 10 is an explanatory diagram showing why the mounting structure of the seal member 30 employed in the exhaust hood 1 of this embodiment does not impair the aesthetic appearance of the exhaust hood 1. FIG. 10 is an explanatory diagram showing a method of attaching the front cover 20 to the rear plate 10 of the exhaust hood 1 of this embodiment. FIG. This is an explanatory diagram showing why the sealing member 30 may be peeled off when the front cover 20 is attached if the guide portion 14 is not protruding from the outer surface of the flange portion 13 of the rear plate 10. 10 is an explanatory diagram showing the reason why a guide portion 14 is provided to protrude from the outer surface of the flange portion 13 of the rear plate 10 in the exhaust hood 1 of this embodiment. FIG. 1 is an explanatory diagram showing the reason why a rib 15 is provided protruding from the upper end of the rear plate 10 and a rib 23 is provided protruding from the upper end of the front cover 20 in the exhaust hood 1 of this embodiment. 10 is an explanatory diagram illustrating a seal member 30 having upper and lower sections with different cross-sectional shapes. FIG. 10 is an explanatory diagram showing a state in which the front cover 20 is attached to the rear panel 10 of the exhaust hood 1 of the first modified example to which the seal member 30 having the tongue portion 31 is attached. FIG. 10 is a cross-sectional view of an exhaust hood 1 according to a second modified example in which a flange portion 13 is provided to protrude rearward from a rear plate 10. FIG. FIG. 10 is a cross-sectional view of an exhaust hood 1 according to a third modified example in which a seal member 30 is attached to the inner surface of a frame wall portion 22 and a guide portion 14 is also provided to protrude from the inner surface of the frame wall portion 22. 10 is a cross-sectional view of an exhaust hood 1 according to a fourth modified example in which a guide portion 14 is protruded from a flange portion 13 of a rear plate 10 and a seal member 30 is attached to a frame wall portion 22 of a front cover 20. FIG. FIG. 10 is a cross-sectional view of another aspect of the exhaust hood 1 of the fourth modified example in which a guide portion 14 is protruded from the frame wall portion 22 of the front cover 20 and a seal member 30 is attached to the flange portion 13 of the rear plate 10.

A. This Example:
FIG. 1 is an exploded view showing the structure of an exhaust hood 1 according to this embodiment. As shown, the exhaust hood 1 includes a sheet-metal front cover 20 attached to the front of a sheet-metal rear panel 10. The rear panel 10 includes a rectangular rear panel main body 11. A round hole 12 is formed in the upper portion of the rear panel main body 11, and the upper and left and right ends of the rear panel main body 11 are bent forward to form a wall-like, elongated flange portion 13. A convex rib 15 extending in the longitudinal direction of the flange portion 13 protrudes from the upper surface of the flange portion 13 (hereinafter, flange portion 13a). Furthermore, three guide portions 14 protruding outward are formed on the outer surfaces of the flange portions 13 formed at the left and right ends (the left side surface for the flange portion 13b formed at the left end, and the right side surface for the flange portion 13c formed at the right end) aligned vertically. The guide portions 14 in this embodiment correspond to the "protrusions" of the present invention.

Figure 1 shows an enlarged view of the guide portion 14 formed on the flange portion 13c at the right end. As shown in the figure, the guide portion 14 has a forward inclined portion 14a that rises from the flange portion 13c at a gentle angle, and a top surface portion 14b that continues from the forward inclined portion 14a, giving it an overall wedge shape. Similarly, the guide portion 14 formed on the flange portion 13b at the left end also has a forward inclined portion 14a that rises from the flange portion 13b, and a top surface portion 14b, giving it an overall wedge shape that becomes less prominent as it moves forward.

The lower end of the rear plate main body 11 is bent diagonally forward to form a long, narrow protective plate 16. A cylindrical mounting tube 17 is inserted into a round hole 12 formed in the upper part of the rear plate main body 11. A ring-shaped flange 17a is formed on one end of this mounting tube 17, and the tip on the side without the flange 17a protrudes from the back surface of the rear plate main body 11. The mounting tube 17 is attached to the rear plate main body 11 with the flange 17a abutting against the rear plate main body 11.

A rectangular sound-absorbing panel 19 made of glass wool is attached to the front side of the rear panel main body 11. The width of the sound-absorbing panel 19 is set to match the distance between the flanges 13 erected on the left and right ends of the rear panel main body 11, and the sound-absorbing panel 19 is attached to the rear panel main body 11 while being positioned by the flanges 13 erected on the top and left and right ends of the rear panel main body 11. In addition, the sound-absorbing panel 19 has a circular exhaust window 19a with a diameter equal to or larger than that of the circular hole 12, formed in a position coaxial with the circular hole 12 when attached to the rear panel main body 11.

The front cover 20 has a rectangular cover body 21 with elongated frame wall portions 22 extending from the top and left and right ends toward the rear panel 10. In the example shown in FIG. 1, the left and right ends of the rectangular sheet metal cover body 21 are bent to form the left-side frame wall portion 22b and the right-side frame wall portion 22c. Furthermore, an upper frame wall portion 22a is attached to the top of the cover body 21 so as to close the gap between the left-side frame wall portion 22b and the right-side frame wall portion 22c. A sheet metal bottom plate 25 is attached to the bottom of the cover body 21, and multiple wind direction vanes 25a are formed on the bottom plate 25 by cutting and bending. Additionally, a convex rib 23 extending in the longitudinal direction of the frame wall 22a is formed on the upper surface of the upper end frame wall 22a, and accordingly, the underside of the rib 23 forms a groove-like shape where the underside of the frame wall 22a is recessed. The length and size of the groove are such that the rib 15 protruding from the flange 13a on the upper end of the rear panel 10 fits perfectly into the groove.

A rectangular sound-absorbing panel 24 made of glass wool is also attached to the rear side of the cover main body 21 (the side facing the rear panel 10). The width of the sound-absorbing panel 24 is set to match the distance between the frame wall portions 22 formed on the left and right ends of the cover main body 21. The sound-absorbing panel 24 is attached to the cover main body 21 while being positioned by the frame wall portion 22a formed on the top end of the cover main body 21 and the frame wall portions 22b, 22c formed on the left and right ends. In addition, a protrusion 24a protruding toward the rear panel 10 is formed on the top end of the sound-absorbing panel 24. When the sound-absorbing panel 24 is attached to the front cover 20, the inner surface of the frame wall portion 22a on the top end of the front cover 20 is covered by the protrusion 24a protruding from the sound-absorbing panel 24.

In addition, in the exhaust hood 1 of this embodiment, the distance between the frame wall portions 22 formed at the left and right ends of the front cover 20 is greater than the distance between the outer surfaces of the flange portions 13 formed at the left and right ends of the rear panel 10. Therefore, the front cover 20 can be attached to the rear panel 10 from the front, with the flange portions 13 of the rear panel 10 housed inside the frame wall portions 22. Furthermore, elongated sealing members 30 made of a soft, sponge-like material are affixed to the outer surfaces of the flange portions 13 of the rear panel 10 (i.e., the upper surface of the upper flange portion 13a, the left side surface of the left flange portion 13b, and the right side surface of the right flange portion 13c). Therefore, when the front cover 20 is attached to the rear panel 10, the gap between the inner surface of the frame wall portion 22 of the front cover 20 and the outer surface of the flange portions 13 of the rear panel 10 is sealed by the sealing members 30.

Figure 2 is an explanatory diagram showing the exhaust hood 1 of this embodiment attached to the exterior wall 2 of a building. The exhaust hood 1 of this embodiment is attached with the mounting tube 17 (see Figure 1) protruding from the rear side inserted into the exhaust port 3 opening in the exterior wall 2. The hatched arrows in the figure indicate the flow of combustion exhaust. As shown in the figure, the combustion exhaust flowing out from the exhaust port 3 passes through the inside of the exhaust hood 1 and is discharged from below.

In this way, by attaching the exhaust hood 1 to the location where the exhaust vent 3 opens in the exterior wall 2, it is possible to prevent outdoor wind and rain from entering through the exhaust vent 3. Furthermore, as described above using Figure 1, sound-absorbing panels 19, 24 are housed inside the exhaust hood 1, which prevents the exhaust noise of combustion exhaust from being emitted outdoors and also prevents outdoor noise from entering the room through the exhaust vent 3. At the same time, as shown in Figure 2, the exhaust hood 1 has a thin and sleek exterior shape. Additionally, a base plate 18 is attached to the underside of the exhaust hood 1, so the interior cannot be seen even when viewed from below. Therefore, even when the exhaust hood 1 is attached to the exterior wall 2 of a building, it does not detract from the building's appearance.

However, because the exhaust hood 1 is attached to the exterior wall 2 of a building, there is a concern that if the volume of combustion exhaust increases and the pressure inside the exhaust hood 1 increases, the combustion exhaust may leak from the gap between the front cover 20 and the rear panel 10, soiling the exterior wall 2 of the building. Therefore, as shown in Figure 3(a) or 3(b), it is possible to form flanges 91a and 92a on the outer peripheries of the rear panel 91 and front cover 92, and attach the front cover 92 to the rear panel 91 with a sealing member 93 sandwiched between the flanges 91a and 92a. This eliminates the risk of combustion exhaust leaking from between the front cover 92 and the rear panel 91, but the sealing member 93 is visible from outside the exhaust hood 9, which detracts from the aesthetic appearance of the exhaust hood 9. As a result, attaching the exhaust hood 9 to the exterior wall 2 of a building may detract from the overall appearance of the building.

In view of this, the exhaust hood 1 of this embodiment employs a structure in which a sealing member 30 is attached to the outer surface of the flange portion 13 extending from the rear panel 10 (see Figure 1), and the sealing member 30 is sandwiched between the outer surface of the flange portion 13 and the inner surface of the frame wall portion 22 extending from the front cover 20. Figure 4 shows the sealing member 30 sandwiched between the frame wall portion 22 of the front cover 20 and the flange portion 13 of the rear panel 10. This prevents combustion exhaust from leaking between the front cover 20 and the rear panel 10. Furthermore, because the sealing member 30 is located inside the frame wall portion 22 of the front cover 20, it is not visible from the outside and does not detract from the aesthetic appearance of the exhaust hood 1.

However, the structure shown in Figure 4 differs significantly from the structure shown in Figure 3 in that the direction in which the front cover 20 is attached does not match the direction in which the seal member 30 is compressed. That is, in the structure shown in Figure 3, the front cover 92 is attached to the rear plate 91 from the front, and the seal member 93 is also compressed from the front. In contrast, in the structure shown in Figure 4, the front cover 20 is attached to the rear plate 10 from the front, but the frame wall portion 22 of the front cover 20 compresses the seal member 30 from the side, and the direction in which the front cover 20 is attached differs from the direction in which the seal member 30 is compressed. Therefore, in the exhaust hood 1 of this embodiment, the front cover 20 is attached to the rear plate 10 as follows.

Figure 5 is an explanatory diagram showing how the front cover 20 is attached to the rear panel 10 of the exhaust hood 1 of this embodiment. Note that Figure 5 shows a cross-sectional view of the exhaust hood 1 cut horizontally. When attaching the front cover 20 to the rear panel 10, as shown in Figure 5(a), the front cover 20 is moved toward the rear panel 10 from the front while ensuring that the flange portion 13 extending from the rear panel 10 is positioned inside the frame wall portion 22 of the front cover 20. The hatched arrow in Figure 5(a) indicates how the front cover 20 is moved toward the rear panel 10 from the front. Because a seal member 30 is affixed to the outer surface of the flange portion 13 of the rear panel 10 (see Figure 1), as the front cover 20 is moved toward the rear panel 10, the leading edge of the frame wall portion 22 of the front cover 20 abuts against the front side of the seal member 30.

In addition, a guide portion 14 protrudes from the outer surface of the flange portion 13 in front of the seal member 30. However, the height of the guide portion 14 is sufficiently lower than the thickness of the seal member 30 (for example, less than one-third the thickness of the seal member 30). Therefore, if the front cover 20 is properly positioned relative to the rear panel 10, the tip of the frame wall portion 22 will not abut against the guide portion 14. Hereinafter, the front side of the seal member 30 will be referred to as the "front side 30a." Furthermore, the side of the seal member 30 on the side where it is attached to the flange portion 13 will be referred to as the "inner side 30b," and the side of the seal member 30 opposite the inner side 30b will be referred to as the "outer side 30c."

As the front cover 20 is moved closer to the rear panel 10 from the state shown in Figure 5(a), the leading edge of the frame wall portion 22 of the front cover 20 abuts against the front side surface 30a of the seal member 30, and the seal member 30 is pushed by the frame wall portion 22 and deformed. Figure 5(b) shows the state in which the seal member 30 is deformed by being pushed by the frame wall portion 22 of the front cover 20. As the front cover 20 is moved further closer to the rear panel 10 from this state, the deformation of the seal member 30 becomes even greater, and eventually a portion of the outer side surface 30c of the seal member 30 slides inside the frame wall portion 22. Then, as the front cover 20 is moved further closer to the rear panel 10, the area of the outer side surface 30c of the seal member 30 that is inside the frame wall portion 22 increases, and eventually, as shown in Figure 5(c), the entire seal member 30 is inside the frame wall portion 22.

Furthermore, the sealing member 30 is pressed from the front (from above in FIG. 5) by the frame wall portion 22 of the front cover 20 and deformed. As a result, even after the front cover 20 is attached, the sealing member 30 is deformed into a shape in which the outer surface 30c is shifted rearward (downward in FIG. 5) relative to the inner surface 30b. Here, this amount of deformation is designated as L1 (see FIG. 5(c)). However, as shown in FIG. 5(c), the sealing member 30 in this embodiment is attached at a distance L2 (typically 3 to 5 mm) greater than the amount of deformation L1 from the rear end (bottom end in FIG. 5) of the flange portion 13. Therefore, even if the sealing member 30 deforms rearward, the entire sealing member 30 is reliably inserted inside the frame wall portion 22 by simply pushing the front cover 20 all the way to the rear end of the flange portion 13.

Furthermore, the exhaust hood 1 of this embodiment has multiple guide portions 14 protruding from the outer surface of the flange portion 13 of the rear panel 10, forward of the position where the seal member 30 is affixed to the outer surface of the flange portion 13. By providing these guide portions 14, it becomes possible to prevent the seal member 30 from peeling off from the flange portion 13 or from being damaged when attaching the front cover 20 to the rear panel 10. This point will be explained below.

Figure 6 is an explanatory diagram showing why, if the guide portion 14 is not protruding from the outer surface of the flange portion 13, there is a risk that the seal member 30 may be peeled off from the flange portion 13 or damaged when attaching the front cover 20 to the rear panel 10. Figure 6(a) shows a case where the front cover 20 is positioned off to one side in the left or right direction (to the left in Figure 6) when attaching the front cover 20 to the rear panel 10.

As shown in Figure 6(a), when the front cover 20 is positioned offset, if the guide portion 14 does not protrude from the flange portion 13, the leading edge of the frame wall portion 22 will abut against the front side surface 30a near the inner side surface 30b of the sealing member 30. Figure 6(b) shows the state in which the leading edge of the frame wall portion 22 abuts against the inner side surface 30b of the sealing member 30. Because the inner side surface 30b of the sealing member 30 is attached to the flange portion 13, even if the sealing member 30 is pressed by the frame wall portion 22 in the state shown in Figure 6(b), the sealing member 30 will hardly deform. Therefore, if the front cover 20 is pressed hard when attaching it to the rear panel 10, the sealing member 30 attached to the flange portion 13 may peel off or tear where the frame wall portion 22 presses against it.

In contrast, in the exhaust hood 1 of this embodiment, a guide portion 14 protrudes from the outer surface of the flange portion 13 at a position forward of the seal member 30, and the front side surface 30a near the inner surface 30b of the seal member 30 is protected by the guide portion 14. Therefore, even if the front cover 20 is positioned offset to either the left or right, when the front cover 20 is brought closer to the rear panel 10, the tip of the frame wall portion 22 abuts against the guide portion 14, thereby preventing the seal member 30 from abutting against the front side surface 30a near the inner surface 30b. Figure 7(a) shows the state in which the tip of the frame wall portion 22 abuts against the guide portion 14.

In addition, as mentioned above, the guide portion 14 is formed in a wedge shape with a reduced height at the front (upper portion in FIG. 7(a)). Therefore, when the front cover 20 is moved toward the rear panel 10 with the leading edge of the frame wall portion 22 abutting against the guide portion 14, the leading edge of the frame wall portion 22 is guided by the forward inclined portion 14a of the guide portion 14, as indicated by the thick arrow in FIG. 7(a), and its position is naturally corrected. As a result, as shown in FIG. 7(b), the frame wall portion 22 of the front cover 20 abuts against the front side surface 30a at a position away from the inner side surface 30b. This makes it possible to prevent the sealing member 30 from peeling off or tearing near the inner side surface 30b when attaching the front cover 20 to the rear panel 10.

As described above with reference to FIG. 1, the exhaust hood 1 of this embodiment has a rib 15 that protrudes from the upper surface of the flange portion 13a at the upper end of the rear panel 10 and extends in the longitudinal direction of the flange portion 13a. Furthermore, a rib 23 that protrudes from the upper surface of the frame wall portion 22a at the upper end of the front cover 20 and extends in the longitudinal direction of the frame wall portion 22a is also provided. Accordingly, the underside of the rib 23 forms a groove-like shape, with the underside of the frame wall portion 22a recessed. The length and size of the groove are such that the rib 15 protruding from the flange portion 13a of the rear panel 10 fits perfectly into the groove. As explained below, these ribs 15 and ribs 23 allow for easy positioning of the front cover 20 relative to the rear panel 10 and also allow the seal member 30 to be deformed with little force when attaching the front cover 20.

Figure 8 is an explanatory diagram showing a method for attaching the front cover 20 of the exhaust hood 1 of this embodiment to the rear panel 10. When attaching the front cover 20 to the rear panel 10, as shown in Figure 8(a), the front cover 20 is tilted so that its lower end projects forward, and then the front cover 20 is brought closer to the rear panel 10 from above. At this time, if the ribs 23 protruding from the frame wall portion 22a of the front cover 20 are aligned with the ribs 15 protruding from the upper part of the rear panel 10, the ribs 15 of the rear panel 10 fit into the recessed grooves on the backside of the ribs 23, and the front cover 20 is positioned relative to the rear panel 10 in the front-to-rear direction (left-to-right on the plane of Figure 8) and the left-to-right direction (perpendicular to the plane of Figure 8). Furthermore, in order to fit the rib 15 of the rear panel 10 into the groove on the back side of the rib 23, the seal member 30 must be deformed by the frame wall portion 22 of the front cover 20. However, because the front cover 20 is tilted as shown in Figure 8(a), it is only necessary to deform a portion of the seal member 30 near its upper end. This means that the rib 15 of the rear panel 10 can be fitted into the groove on the back side of the rib 23 with little force.

Next, the lower part of the front cover 20 is pushed toward the rear panel 10, thereby rotating the front cover 20 around the area where the rib 23 at the top of the front cover 20 protrudes. The hatched arrow in Figure 8(b) indicates that the lower part of the front cover 20 is being pushed toward the rear panel 10. As the front cover 20 is rotated around the area near the rib 23 at the top, the position where the frame wall portion 22 of the front cover 20 deforms the sealing member 30 (point P in Figure 8(b)) gradually moves downward. In other words, rather than deforming the entire sealing member 30 simultaneously, the position (point P) at which the deformation occurs can be moved gradually, allowing for deformation with a small force. In addition, by pushing the lower part of the front cover 20 as shown in Figure 8(b), the force required to deform the sealing member 30 is further reduced due to the principle of leverage. Then, rotate the front cover 20 until the bottom plate 25 attached to the lower end of the front cover 20 abuts the rear plate 10, and installation of the front cover 20 is complete.

When the front cover 20 is tilted relative to the rear panel 10 as described above and then rotated to attach it to the rear panel 10, the distance from the center of rotation of the front cover 20 to the position (point P) where the frame wall portion 22 deforms the sealing member 30 increases as the front cover 20 approaches parallelism with the rear panel 10. This reduces the effect of the leverage principle, and increases the force required to deform the sealing member 30.

As described above with reference to Figures 1 and 2, the circular hole 12 through which the combustion exhaust gas flows into the exhaust hood 1 is formed in the upper part of the exhaust hood 1, and the lower part of the exhaust hood 1 is open. Therefore, although the pressure due to the combustion exhaust gas is high in the upper part of the exhaust hood 1, it is not as high in the lower part of the exhaust hood 1 as in the upper part. Therefore, the shape of the seal member 30 attached to the left and right flange portions 13b, 13c of the rear panel 10 may be different between the upper and lower parts. For example, as shown in Figure 9(a), the thickness of the seal member 30 may be set to T1 within a distance H from the upper end of the seal member 30, but as the distance exceeds H, the thickness may gradually decrease to T2, which is smaller than T1, at the lower end of the seal member 30. Alternatively, the thickness of the seal member 30 may decrease linearly from the thickness T1 at the upper end to the thickness T2 at the lower end without setting a fixed distance.

Furthermore, instead of changing the thickness of the sealing member 30, the width of the sealing member 30 may be changed. For example, as shown in FIG. 9(b), the width of the sealing member 30 is set to W1 within the range from the top end of the sealing member 30 up to the distance H, but as the distance exceeds H, the width gradually decreases, becoming W2, which is smaller than W1, at the bottom end of the sealing member 30. Alternatively, instead of setting a fixed distance, the width of the sealing member 30 may decrease linearly from the width W1 at the top end to the width W2 at the bottom end. Of course, the thickness and width of the sealing member 30 may also be changed simultaneously.

The sealing member 30 with this shape is more susceptible to deformation at the bottom than at the top. Therefore, as described above with reference to Figure 8, even when installing the front cover 20 by rotating it around the rib 23 formed on the top end of the front cover 20, it is possible to install the front cover 20 with little force all the way to the end.

There are several variations of the exhaust hood 1 of the above-described embodiment. These variations will be described below, focusing on the differences from this embodiment.
B. First Modification:
In the above-described embodiment, the seal member 30 has been described as having a rectangular cross section. However, the cross section of the seal member 30 does not necessarily have to be rectangular, and may have a shape that has a tongue 31 that protrudes in the opposite direction from the inner surface 30b that is attached to the flange portion 13 of the rear panel 10, as shown in FIG.

Figure 10 is an explanatory diagram showing how the front cover 20 is attached to the rear panel 10 of the first modified example, to which a sealing member 30 having a tongue portion 31 is attached. As shown in Figure 10(a), when the front cover 20 is positioned and brought closer to the rear panel 10, the tip of the frame wall portion 22 abuts against the tongue portion 31 of the sealing member 30. As the front cover 20 is brought closer to the rear panel 10 from that state, the tongue portion 31 is pushed by the frame wall portion 22, causing it to bend and deform, and enter the inside of the frame wall portion 22 as shown in Figure 10(b). In the state shown in Figure 10(b), the tongue portion 31 of the sealing member 30 is compressed by the frame wall portion 22. Therefore, the compressed tongue portion 31 is tightly attached to the inside of the frame wall portion 22 due to its force as it tries to return to its original shape, preventing combustion exhaust from leaking through the gap between the front cover 20 and the rear panel 10. Furthermore, because the seal member 30 is hidden inside the frame wall portion 22, it is not visible from the outside and does not detract from the aesthetic appearance of the exhaust hood 1.

In addition, in the present embodiment described above, the entire sealing member 30 deforms when the front cover 20 is attached (see Figure 5(c)), whereas in the sealing member 30 of the first modified example, only the tongue portion 31 deforms. Therefore, in the first modified example, the front cover 20 can be attached with less force than in the present embodiment. As a result, the sealing member 30 can be formed using a more durable material such as rubber, rather than a soft, sponge-like material.

C. Second Modification:
In the above-described embodiment and first modified example, the flange portion 13 of the rear plate 10 has been described as protruding forward (toward the front cover 20). However, the flange portion 13 of the rear plate 10 may also protrude rearward. FIG. 11 is a cross-sectional view of an exhaust hood 1 of a second modified example in which the flange portion 13 protrudes rearward from the rear plate 10. In this type of exhaust hood 1 of the second modified example, as with the exhaust hood 1 of the above-described embodiment, the seal member 30 sandwiched between the flange portion 13 of the rear plate 10 and the frame wall portion 22 of the front cover 20 can prevent combustion exhaust gas from leaking. In addition, because the seal member 30 is not visible from the outside of the exhaust hood 1, there is no risk of it detracting from the aesthetic appearance of the exhaust hood 1.

D. Third Modification:
In the above-described embodiment, the first modified example, and the second modified example, the seal member 30 and the guide portion 14 are both described as being provided on the outer surface of the flange portion 13 of the rear panel 10. However, the seal member 30 may be attached to the inner surface of the frame wall portion 22 of the front cover 20 instead of the outer surface of the flange portion 13 of the rear panel 10, and the guide portion 14 may also be provided to protrude from the inner surface of the frame wall portion 22.

Figure 12 is a cross-sectional view of an exhaust hood 1 of a third modified example having such a configuration. As with the exhaust hood 1 of the present embodiment described above, the exhaust hood 1 of this third modified example can also prevent combustion exhaust gas from leaking out by using the sealing member 30 sandwiched between the flange portion 13 of the rear panel 10 and the frame wall portion 22 of the front cover 20. In addition, because the sealing member 30 cannot be seen from the outside of the exhaust hood 1, there is no risk of it detracting from the aesthetic appearance of the exhaust hood 1.

E. Fourth Variant:
In the above-described embodiment and the first to third modified examples, both the seal member 30 and the guide portion 14 are described as being provided on either the outer surface of the flange portion 13 or the inner surface of the frame wall portion 22. However, either the seal member 30 or the guide portion 14 may be provided on the outer surface of the flange portion 13 and the other on the inner surface of the frame wall portion 22.

Figure 13 shows a cross-sectional view of a fourth modified exhaust hood 1 in which a sealing member 30 is affixed to the outer surface of the flange portion 13 and a guide portion 14 protrudes from the inner surface of the frame wall portion 22. As shown by the hatched arrow in Figure 13(a), when the front cover 20 is moved closer to the rear panel 10, as shown in Figure 13(b), the front cover 20 can be attached to the rear panel 10 with the sealing member 30 compressed between the flange portion 13 of the rear panel 10 and the frame wall portion 22 of the front cover 20. This prevents combustion exhaust from leaking between the flange portion 13 of the rear panel 10 and the frame wall portion 22 of the front cover 20. Additionally, because the sealing member 30 is not visible from the outside of the exhaust hood 1, there is no risk of it detracting from the aesthetic appearance of the exhaust hood 1.

Furthermore, if the position of the front cover 20 is misaligned with the rear panel 10, as shown in Figure 13(c), the tip of the flange portion 13 abuts against the guide portion 14 before the tip of the frame wall portion 22 abuts against the seal member 30, thereby correcting the position of the front cover 20. This prevents the tip of the frame wall portion 22 from abutting too hard against the seal member 30 when attaching the front cover 20, which could cause the seal member 30 to peel off or tear.

Figure 14 shows a cross-sectional view of another aspect of the exhaust hood 1 of the fourth modified example, in which the guide portion 14 protrudes from the outer surface of the flange portion 13 and the seal member 30 is affixed to the inner surface of the frame wall portion 22 (see Figure 14(a)). Even with this type of exhaust hood 1, when the front cover 20 is attached to the rear plate 10, as shown in Figure 14(b), the seal member 30 can be compressed between the flange portion 13 of the rear plate 10 and the frame wall portion 22 of the front cover 20, thereby preventing leakage of combustion exhaust. In addition, because the seal member 30 is not visible from the outside of the exhaust hood 1, there is no risk of it detracting from the aesthetic appearance of the exhaust hood 1.

Furthermore, if the position of the front cover 20 is misaligned with respect to the rear panel 10, as shown in Figure 14(c), the leading edge of the frame wall portion 22 abuts against the guide portion 14 before the leading edge of the flange portion 13 abuts against the sealing member 30, thereby correcting the position of the front cover 20. This also prevents the sealing member 30 from peeling off or tearing when attaching the front cover 20.

The above describes the exhaust hood 1 in this embodiment and various modified examples, but the present invention is not limited to the above embodiment and modified examples, and can be implemented in various forms without departing from the spirit of the invention.

1...exhaust hood, 2...exterior wall, 3...exhaust port, 9...exhaust hood,
10... rear plate, 11... rear plate main body portion, 12... round hole, 13... flange portion,
14... guide portion, 14a... forward inclined portion, 14b... top surface portion, 15... rib,
16...protective plate portion, 17...mounting tube, 19...sound absorbing plate, 19a...exhaust window,
20... Front cover, 21... Cover main body portion, 22... Frame wall portion, 23... Rib,
24...sound absorbing plate, 24a...protrusion, 25...bottom plate, 25a...wind deflector,
30...sealing member, 30a...front side surface, 30b...inner side surface,
30c...outer surface, 31...tongue.

Claims (6)

An exhaust hood includes a rear plate attached to an exterior wall of a building and a front cover attached to the rear plate so as to cover the front of the rear plate, the exhaust hood being attached to the exterior wall to protect an exhaust port that opens into the exterior wall and discharges combustion exhaust gas outdoors from outdoor wind and rain,
The rear plate is
a plate-shaped rear panel main body portion that faces the outer wall when attached to the outer wall;
wall-shaped flange portions extending from the upper end and left and right ends of the rear panel main body portion;
a frame wall portion protruding from an upper end and left and right ends of the front cover toward a position that is outside the flange portion when the front cover is attached to the rear plate;
a compressible seal member is attached to one of an outer surface of the flange portion or an inner surface of the frame wall portion as viewed from the rear panel main body portion, along a direction in which the flange portion or the frame wall portion continues;
an exhaust hood characterized in that, when the front cover is attached to the rear plate from the front, either the inner surface of the frame wall portion or the outer surface of the flange portion crosses the seal member while compressing the seal member between the outer surface of the flange portion and the inner surface of the frame wall portion, thereby covering the seal member. 2. The exhaust hood of claim 1,
When the seal member is attached to the outer surface of the flange portion, a protrusion having a thickness smaller than the thickness of the seal member is provided on the outer surface of the flange portion at a position forward of the seal member,
an exhaust hood, wherein, when the sealing member is attached to the inner surface of the frame wall portion, a protrusion that is shorter than the thickness of the sealing member is provided on the inner surface of the frame wall portion at a position rearward of the sealing member. 3. The exhaust hood of claim 2,
The exhaust hood, wherein the protrusion is formed in a wedge shape whose height decreases as it moves away from the sealing member. 2. The exhaust hood of claim 1,
the sealing member is attached to either the outer surface of the flange portion or the inner surface of the frame wall portion,
an exhaust hood, wherein a protrusion having a thickness smaller than that of the seal member is provided on the other of the inner surface of the frame wall portion or the outer surface of the flange portion. 5. The exhaust hood of claim 4,
When the protrusion is provided on the outer surface of the flange, the protrusion is formed in a wedge shape whose height decreases toward the front,
the protrusion is formed in a wedge shape that decreases in height toward the rear when the protrusion is provided on the inner surface of the frame wall portion. The exhaust hood according to any one of claims 1 to 5,
the seal member is attached to the outer surface of the flange portion, and when the front cover is attached, a portion of the front cover that abuts on the frame wall portion is deformed rearward,
an exhaust hood characterized in that the distance from the rear end of the sealing member attached to the outer surface of the flange portion to the rear end of the flange portion is greater than the amount of rearward deformation of the sealing member at the portion that abuts against the front cover when the front cover is attached.