Exhaust hood

Abstract

To prevent combustion exhaust from leaking between a front cover (20) and a rear plate (10) without impairing an appearance of an exhaust hood (1).SOLUTION: A wall-shaped flange portion (13) is raised from an upper end and left and right ends of a rear plate body portion (11) of a rear plate formed in a plate-shape. A frame wall portion (22) is protrusively provided from an upper end and left and right ends of a front cover, and a seal member (30) is pasted on one of an outside surface of the flange portion and an inside surface of the frame wall portion. When attaching the front cover to the rear plate, it is attached so that one of the inside surface of the frame wall portion and the outside surface of the flange portion traverses the seal member while compressing the seal member. Therefore, the seal member blocking a space between the rear plate and the front cover can prevent the leakage of combustion exhaust, and the seal member cannot be seen from the outside, so that the appearance of the exhaust hood is not impaired.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] 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 that opens into the exterior wall. [Background technology]

[0002] Among combustion devices that burn fuel indoors, there are those that discharge the combustion exhaust generated by combustion indoors, and those that discharge it outdoors. In combustion devices that discharge the combustion exhaust outdoors, the combustion exhaust generated by combustion is guided using an exhaust duct to an exhaust passage that penetrates the wall of the building, and then discharged outdoors through an exhaust port opening in the exterior wall. In addition, to prevent wind and rain from entering the room through the exhaust port opening in 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.

[0003] The exhaust hood has a structure in which a front cover that covers the front side of a plate-shaped rear plate is attached to the rear plate. The rear plate has a round hole of about the same size as the exhaust port, and the front covers are attached to the top end and left and right ends of the rear plate, covering the round hole and being 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.

[0004] When attaching an exhaust hood to an exterior wall, the rear plate is attached to the wall with the circular hole in the rear plate aligned with the exhaust port opening in the exterior wall. In this way, the front cover attached to the rear plate prevents wind and rain from reaching the exhaust port, while combustion exhaust from the exhaust port can be discharged downward through the space between the front cover and the rear plate. Furthermore, by filling the gap between the building's exterior wall and the rear plate 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.

[0005] However, if 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 the shape of the area where the caulking material is filled in (Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-139057 Summary of the Invention [Problem to be solved by the invention]

[0007] However, with the conventional exhaust hoods proposed above, when the volume of combustion exhaust air increases, the combustion exhaust can leak from the gap between the front cover and rear plate, soiling the exterior walls of the building. In order to stop the leakage of combustion exhaust, sealing flange surfaces are formed on the front cover and rear plate and sealing members are fastened together, but this causes the sealing members between the flange surfaces to be visible from the outside of the exhaust hood, which detracts from the aesthetic appearance.

[0008] This invention has been made to solve the above-mentioned problems of the conventional technology, and aims to provide an exhaust hood that can prevent combustion exhaust gas from leaking between the front cover and rear plate without spoiling the aesthetic appearance. [Means for solving the problem]

[0009] 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-like flange portions erected from the upper end and left and right ends of the rear plate main body portion; Equipped with 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 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. It is characterized by:

[0010] In the exhaust hood of the present invention described above, wall-like flange portions are erected from the upper end and left and right ends of the rear panel main body portion of the plate-shaped rear panel, and frame wall portions are protruded from the upper end and left and right ends of the front cover attached to the rear panel toward the rear panel. A sealing member is attached to either the outer surface of the flange portions or the inner surface of the frame wall portions. When the front cover is attached to the rear panel, either the inner surface of the frame wall portion of the front cover or the outer surface of the flange portions of the rear panel crosses the sealing member while compressing the sealing member between the inner surface of the frame wall portion and the outer surface of the flange portions, thereby covering the sealing member.

[0011] 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 upper end and left and right ends of the rear plate and the frame wall portions erected from the upper end and left and right ends of the front cover, preventing combustion exhaust gas 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.

[0012] In the exhaust hood of the present invention described above, when a 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 may be provided on the outer surface forward of the position where the seal member is attached. On the other hand, when a seal member is attached to the inner surface of the frame wall portion, a protrusion having a thickness smaller than the thickness of the seal member may be provided on the inner surface rearward of the position where the seal member is attached.

[0013] 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. In addition, 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.

[0014] In addition, 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 shape of the protrusion may be formed into a wedge shape whose height decreases as it moves away from the sealing member.

[0015] In this way, even if the front cover is misaligned relative to the rear plate when being attached to the rear plate and the tip of the frame wall or flange abuts against the protrusion, the wedge-shaped protrusion can correct the misalignment of the front cover, making it possible to attach the front cover properly.

[0016] 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 thickness of 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.

[0017] In this way, when attaching the front cover to the rear plate, the tip of either the outer or inner surface abuts against the convex portion before the tip of the other of the outer or inner surface abuts against the sealing member, so that the sealing member is protected by the convex portion, preventing the sealing member from being peeled off by the tip of the frame wall portion of the front cover or the frame wall portion of the rear plate when attaching the front cover.

[0018] In the exhaust hood of the present invention described above, when the convex portion protrudes from the outer surface of the flange portion, the shape of the convex portion may be a wedge shape that decreases in height toward the front. On the other hand, when the convex portion protrudes from the inner surface of the frame wall portion, the shape of the convex portion may be a wedge shape that decreases in height toward the rear.

[0019] In this way, even if the front cover is misaligned relative to the rear plate when the front cover is attached to the rear plate and the tip of the frame wall or flange abuts against the protrusion, the wedge-shaped protrusion can correct the misalignment of the front cover, making it possible to attach the front cover properly.

[0020] Furthermore, in the exhaust hood of the present invention in which the seal 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 seal member that abuts against the front cover is deformed rearward. Therefore, the seal member may be attached to the outer surface of the flange portion in the following position. That is, the seal member may be attached to a position where the distance from the rear end of the seal 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 seal member that abuts against the front cover when the front cover is attached.

[0021] This prevents the deformed seal member from protruding from the frame wall of the front cover when the front cover is attached to the rear plate, thereby making it possible to reliably prevent the aesthetic appearance of the exhaust hood from being marred. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 2 is an exploded view showing the structure of the exhaust hood 1 of the present embodiment. [Figure 2] 1 is an explanatory diagram showing an exhaust hood 1 of this embodiment attached to an outer wall 2 of a building. [Figure 3] 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. [Figure 4] 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. [Figure 5] 10 is an explanatory diagram showing a method of attaching the front cover 20 to the rear plate 10 in the exhaust hood 1 of this embodiment. FIG. [Figure 6] 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. [Figure 7]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. [Figure 8] 10 is an explanatory diagram showing the reason why a rib 15 is provided to protrude from the upper end of the rear plate 10 and a rib 23 is provided to protrude from the upper end of the front cover 20 in the exhaust hood 1 of this embodiment. FIG. [Figure 9] 10 is an explanatory diagram illustrating a seal member 30 having upper and lower sections with different cross-sectional shapes. FIG. [Figure 10] 10 is an explanatory diagram showing a state in which the front cover 20 is attached to the rear plate 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. [Figure 11] 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. [Figure 12] 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. FIG. [Figure 13] 10 is a cross-sectional view of an exhaust hood 1 according to a fourth modified example in which a guide portion 14 is provided to protrude 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. [Figure 14] 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 provided to protrude 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. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0023] A. This Example: FIG. 1 is an exploded view showing the structure of an exhaust hood 1 according to this embodiment. As shown in the figure, the exhaust hood 1 has a structure in which a sheet-metal front cover 20 is attached to the front of a sheet-metal rear panel 10. The rear panel 10 has a rectangular rear panel main body 11. A round hole 12 is formed in the upper part 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 referred to as flange portion 13a) formed at the upper end. 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 flange portion 13b formed at the left end, and the right side surface for 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.

[0024] 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 protrudes from the flange portion 13c at a gentle angle and a top surface portion 14b that continues from the forward inclined portion 14a, forming a wedge-shaped overall shape. Similarly, the guide portion 14 formed on the flange portion 13b at the left end also has a forward inclined portion 14a that protrudes from the flange portion 13b and a top surface portion 14b, forming a wedge-shaped overall shape with the protrusion decreasing toward the front.

[0025] The lower end of 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 rear plate main body 11. One end of mounting tube 17 is formed with a ring-shaped flange 17a, and the tip of the side without flange 17a protrudes from the back surface of rear plate main body 11. Mounting tube 17 is attached to rear plate main body 11 with flange 17a abutting against rear plate main body 11.

[0026] 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 a dimension that matches 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 end and the left and right ends of the rear panel main body 11. In addition, the sound-absorbing panel 19 has a circular exhaust window 19a whose diameter is equal to or larger than that of the circular hole 12, formed in a position that is coaxial with the circular hole 12 when attached to the rear panel main body 11.

[0027] The front cover 20 has a shape in which elongated wall-like frame wall portions 22 extend from the upper end and left and right ends of a rectangular cover main body 21 toward the rear panel 10. In the example shown in FIG. 1, the left and right ends of the rectangular sheet metal cover main body 21 are bent to form a left-end frame wall portion 22b and a right-end frame wall portion 22c. Furthermore, an upper-end frame wall portion 22a is attached to the upper end of the cover main body 21 so as to close the gap between the left-end frame wall portion 22b and the right-end frame wall portion 22c. A sheet metal bottom plate 25 is attached to the lower end of the cover main body 21, and a plurality of wind direction plates 25a are formed on the bottom plate 25 by cutting and raising. Furthermore, a convex rib 23 extending in the longitudinal direction of frame wall 22a is formed on the upper surface of upper frame wall 22a, and accordingly, the underside of frame wall 22a is recessed to form a groove on the back side of rib 23. The length and size of the groove are such that rib 15 protruding from flange 13a on the upper end of rear panel 10 fits perfectly into the groove.

[0028] 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 a dimension that matches 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 in a state where it is positioned by the frame wall portion 22a formed on the upper 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 that protrudes toward the rear panel 10 is formed on the upper end of the sound-absorbing panel 24, and when the sound-absorbing panel 24 is attached to the front cover 20, the inner surface of the frame wall portion 22a on the upper end side of the front cover 20 is covered by the protrusion 24a protruding from the sound-absorbing panel 24.

[0029] Furthermore, 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 surfaces of the frame wall portions 22 of the front cover 20 and the outer surfaces of the flange portions 13 of the rear panel 10 is sealed by the sealing members 30.

[0030] 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 that flows out from the exhaust port 3 passes through the inside of the exhaust hood 1 and is discharged from below.

[0031] 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 with reference to FIG. 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 FIG. 2, the exhaust hood 1 has a thin and neat appearance. In addition, 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.

[0032] On the other hand, because the exhaust hood 1 is attached to the exterior wall 2 of the 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 plate 10, soiling the exterior wall 2 of the building. To address this issue, as shown in FIG. 3( a) or 3(b), it is conceivable to form flanges 91a and 92a on the outer peripheries of the rear plate 91 and the front cover 92, and attach the front cover 92 to the rear plate 91 with a sealing member 93 sandwiched between the flanges 91a and 92a. While this eliminates the risk of combustion exhaust leaking from between the front cover 92 and the rear plate 91, the sealing member 93 is visible from the outside of 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 the building may detract from the overall appearance of the building.

[0033] Therefore, the exhaust hood 1 of this embodiment employs a structure in which a seal member 30 is attached to the outer surface of the flange portion 13 that stands upright from the rear plate 10 (see FIG. 1), and the seal member 30 is sandwiched between the outer surface of the flange portion 13 and the inner surface of the frame wall portion 22 that stands upright from the front cover 20. FIG. 4 shows the seal member 30 sandwiched between the frame wall portion 22 of the front cover 20 and the flange portion 13 of the rear plate 10. This prevents combustion exhaust gas from leaking between the front cover 20 and the rear plate 10. Furthermore, because the seal member 30 is located inside the frame wall portion 22 of the front cover 20, the seal member 30 is not visible from the outside, which does not detract from the aesthetic appearance of the exhaust hood 1.

[0034] However, the structure shown in Fig. 4 differs significantly from the structure shown in Fig. 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 Fig. 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 Fig. 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.

[0035] FIG. 5 is an explanatory diagram showing how the front cover 20 is attached to the rear plate 10 of the exhaust hood 1 of this embodiment. Note that FIG. 5 shows a cross-sectional view of the exhaust hood 1 cut horizontally. When attaching the front cover 20 to the rear plate 10, as shown in FIG. 5(a), the front cover 20 is moved toward the rear plate 10 from the front while ensuring that the flange portion 13 extending from the rear plate 10 is positioned inside the frame wall portion 22 of the front cover 20. The hatched arrow in FIG. 5(a) indicates how the front cover 20 is moved toward the rear plate 10 from the front. Because a seal member 30 is affixed to the outer surface of the flange portion 13 of the rear plate 10 (see FIG. 1), when the front cover 20 is moved toward the rear plate 10, the leading edge of the frame wall portion 22 of the front cover 20 comes into contact with the front side surface of the seal member 30.

[0036] Furthermore, 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 of the thickness of the seal member 30). Therefore, if the front cover 20 is properly positioned with respect to the rear panel 10, the tip of the frame wall portion 22 will not abut against the guide portion 14. Note that, hereinafter, the front side surface of the seal member 30 will be referred to as the "front side surface 30a." Furthermore, the side surface 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 surface 30b," and the side surface of the seal member 30 opposite the inner side surface 30b will be referred to as the "outer side surface 30c."

[0037] As the front cover 20 is moved closer to the rear panel 10 from the state shown in FIG. 5( a), the leading edge of the frame wall portion 22 of the front cover 20 comes into contact with 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. FIG. 5( b) shows the state in which the seal member 30 is pushed and deformed 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 FIG. 5( c), the entire seal member 30 is inside the frame wall portion 22.

[0038] Furthermore, the seal member 30 is deformed by being pressed from the front (upper in FIG. 5 ) by the frame wall portion 22 of the front cover 20. As a result, even after the front cover 20 is attached, the seal member 30 is deformed into a shape in which the outer surface 30c is shifted rearward (lower 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 seal member 30 of this embodiment is attached at a position that is a distance L2 (typically 3 to 5 mm) greater than the amount of deformation L1 from the rear end (lower end in FIG. 5 ) of the flange portion 13. Therefore, even if the seal member 30 is deformed rearward, the entire seal member 30 is reliably inserted inside the frame wall portion 22 by simply pushing the front cover 20 to the rear end of the flange portion 13.

[0039] Furthermore, in the exhaust hood 1 of this embodiment, a plurality of guide portions 14 protrude from the outer surface of the flange portion 13 forward of the position where the seal member 30 is affixed to the outer surface of the flange portion 13 of the rear panel 10. Providing these guide portions 14 makes it 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.

[0040] 6 is an explanatory diagram showing why, when 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 plate 10. Fig. 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 Fig. 6) when attaching the front cover 20 to the rear plate 10.

[0041] When the front cover 20 is moved toward the rear panel 10 in a state in which the front cover 20 is positioned offset as shown in FIG. 6( a), if the guide portion 14 does not protrude from the flange portion 13, the leading end of the frame wall portion 22 will abut against the front side surface 30a near the inner side surface 30b of the seal member 30. FIG. 6( b) shows a state in which the leading end of the frame wall portion 22 abuts against the inner side surface 30b of the seal member 30. Because the inner side surface 30b of the seal member 30 is attached to the flange portion 13, even if the seal member 30 is pressed by the frame wall portion 22 in the state shown in FIG. 6( b), the seal member 30 is hardly deformed. For this reason, if the front cover 20 is pressed hard to attach the front cover 20 to the rear panel 10, the seal member 30 attached to the flange portion 13 may peel off or tear at the portion where the frame wall portion 22 presses against it.

[0042] In contrast, in the exhaust hood 1 of this embodiment, a guide portion 14 is protruded 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 the 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, so it is possible to prevent the seal member 30 from abutting against the front side surface 30a near the inner surface 30b. Figure 7(a) shows a state in which the tip of the frame wall portion 22 abuts against the guide portion 14.

[0043] In addition, as described above, the guide portion 14 is formed in a wedge shape with a lower height at the front (upper portion on the paper surface of FIG. 7(a)). Therefore, when the front cover 20 is moved toward the rear panel 10 with the tip of the frame wall portion 22 abutting against the guide portion 14, the tip of the frame wall portion 22 is guided by the front inclined portion 14a of the guide portion 14, as indicated by the thick arrow in FIG. 7(a), and the 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. Therefore, when attaching the front cover 20 to the rear panel 10, it is possible to prevent the seal member 30 from peeling off or tearing near the inner side surface 30b.

[0044] 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 also protrudes. Accordingly, the rear side of the rib 23 forms a groove shape in which the lower surface of the frame wall portion 22a is recessed. The length and size of the groove are such that the rib 15 that protrudes from the flange portion 13a of the rear panel 10 fits perfectly into the groove. As will be described below, these ribs 15 and 23 are provided to easily position the front cover 20 relative to the rear panel 10 and also to deform the seal member 30 with little force to attach the front cover 20.

[0045] 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 the bottom end of the front cover 20 projects forward, and the front cover 20 is then 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 top of the rear panel 10, the ribs 15 of the rear panel 10 will fit into the recessed grooves on the backside of the ribs 23, and the front cover 20 will be positioned relative to the rear panel 10 in the front-to-rear direction (left-to-right directions on the plane of Figure 8) and the left-to-right direction (directions 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, it is necessary to deform the sealing member 30 with the frame wall portion 22 of the front cover 20, but because the front cover 20 is tilted as shown in Figure 8(a), it is only necessary to deform a portion of the sealing member 30 near the upper end. Therefore, it is possible to fit the rib 15 of the rear panel 10 into the groove on the back side of the rib 23 with little force.

[0046] Next, the lower portion of the front cover 20 is pushed toward the rear panel 10, thereby rotating the front cover 20 around the vicinity of the protruding rib 23 at the top end of the front cover 20. The hatched arrow in FIG. 8(b) indicates that the lower portion of the front cover 20 is being pushed toward the rear panel 10. As the front cover 20 is rotated around the vicinity of the upper rib 23, the position at which the frame wall portion 22 of the front cover 20 deforms the seal member 30 (point P in FIG. 8(b)) gradually moves downward. In other words, rather than deforming the entire seal member 30 all at once, the deformation position (point P) can be moved to gradually deform the seal member 30, allowing for deformation with a small force. In addition, by pushing the lower portion of the front cover 20 as shown in FIG. 8(b), the force required to deform the seal member 30 is further reduced due to the principle of leverage. Then, when the bottom plate 25 attached to the lower end of the front cover 20 is rotated until it abuts against the rear plate 10, the attachment of the front cover 20 is completed.

[0047] In addition, 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 rotation center of the front cover 20 to the position (point P) where the frame wall portion 22 deforms the seal member 30 increases as the front cover 20 approaches parallelism with the rear panel 10. Therefore, the effect of the leverage principle decreases, and the force required to deform the seal member 30 increases.

[0048] As described above with reference to FIGS. 1 and 2 , the circular hole 12 through which the combustion exhaust gas flows into the exhaust hood 1 is formed in the upper portion of the exhaust hood 1, and the lower portion of the exhaust hood 1 is open. Therefore, the pressure due to the combustion exhaust gas is high in the upper portion of the exhaust hood 1, but is not as high in the lower portion of the exhaust hood 1. 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 portions. For example, as illustrated in FIG. 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. However, 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.

[0049] Alternatively, instead of changing the thickness of the sealing member 30, the width of the sealing member 30 may be changed. For example, as illustrated in FIG. 9(b), the width of the sealing member 30 may be set to W1 within a distance H from the top end of the sealing member 30, but as the distance exceeds H, the width may gradually decrease to W2, which is smaller than W1, at the bottom end of the sealing member 30. Alternatively, 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, without setting a constant distance. Of course, the thickness and width of the sealing member 30 may be changed simultaneously.

[0050] The lower part of the sealing member 30 having such a shape is more easily deformed than the upper part. Therefore, as described above with reference to Figure 8, even when the front cover 20 is attached by rotating it around the vicinity of the rib 23 formed on the upper end of the front cover 20, it is possible to attach the front cover 20 with little force all the way to the end.

[0051] There are several variations of the exhaust hood 1 of the above-described embodiment. The following describes these variations, focusing on the differences from this embodiment. B. First variant: 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 tongue 31 that protrudes in the opposite direction from the inner surface 30b that is attached to the flange 13 of the rear panel 10, as shown in FIG.

[0052] FIG. 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 the sealing member 30 having a tongue portion 31 is attached. As shown in FIG. 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 this state, the tongue portion 31 is pushed by the frame wall portion 22 and deforms, bending, and enters the inside of the frame wall portion 22 as shown in FIG. 10( b). In the state shown in FIG. 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 a force that tries to return it to its original shape, preventing combustion exhaust gas from leaking from the gap between the front cover 20 and the rear panel 10. Furthermore, since the seal member 30 is hidden inside the frame wall portion 22, the seal member 30 is not visible from the outside and does not spoil the aesthetic appearance of the exhaust hood 1.

[0053] Additionally, in the present embodiment described above, the entire seal member 30 is deformed when the front cover 20 is attached (see FIG. 5(c)), whereas in the seal member 30 of the first modified example, only the tongue portion 31 is deformed. 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 seal member 30 can be formed using a more durable material such as rubber, rather than a soft, sponge-like material.

[0054] C. Second Variant: In the above-described present 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 present embodiment, the sealing 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 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.

[0055] D. Third Variant: In the above-described present embodiment, first modified example, and second modified example, both the seal member 30 and the guide portion 14 have been 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.

[0056] 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 leakage of combustion exhaust gas by the seal 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 seal member 30 cannot be seen from the outside of the exhaust hood 1, there is no risk of the aesthetic appearance of the exhaust hood 1 being marred.

[0057] E. Fourth Variation: In the above-described present 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 may be provided on the inner surface of the frame wall portion 22.

[0058] FIG. 13 shows a cross-sectional view of an exhaust hood 1 of a fourth modified example in which a seal member 30 is attached to the outer surface of the flange portion 13 and a guide portion 14 is protruded from the inner surface of the frame wall portion 22. As shown by the hatched arrow in FIG. 13(a), when the front cover 20 is moved closer to the rear panel 10, as shown in FIG. 13(b), the front cover 20 can be attached to the rear panel 10 with the seal 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 gas from leaking 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 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.

[0059] 13(c), before the tip of the frame wall portion 22 abuts against the seal member 30, the tip of the flange portion 13 abuts against the guide portion 14, thereby correcting the position of the front cover 20. Therefore, when attaching the front cover 20, it is possible to prevent the tip of the frame wall portion 22 from abutting against the seal member 30 too hard, which could result in the seal member 30 being peeled off or torn off.

[0060] 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, preventing leakage of combustion exhaust gas. 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.

[0061] 14(c), before the tip of the flange portion 13 abuts against the sealing member 30, the tip of the frame wall portion 22 abuts against the guide portion 14, thereby correcting the position of the front cover 20. Therefore, when attaching the front cover 20, the sealing member 30 can be prevented from peeling off or being torn off.

[0062] The above describes the exhaust hood 1 of this embodiment and various modified examples, but the present invention is not limited to the above embodiments and modified examples, and can be implemented in various forms within the scope of the gist of the present invention. [Explanation of symbols]

[0063] 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 surface, 30b...inner surface, 30c...outer surface, 31...tongue.

Claims

1. 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-like flange portions erected from the upper end and left and right ends of the rear plate main body portion; Equipped with 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 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. An exhaust hood characterized by:

2. 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, When the seal member is attached to the inner surface of the frame wall portion, a protrusion having a thickness smaller than the thickness of the seal member is provided on the inner surface of the frame wall portion at a position rearward of the seal member. An exhaust hood characterized by:

3. 3. The exhaust hood of claim 2, The protrusion is formed in a wedge shape that decreases in height as it moves away from the sealing member. An exhaust hood characterized by:

4. 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, 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. An exhaust hood characterized by:

5. 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, When the protrusion is provided on the inner surface of the frame wall, the protrusion is formed in a wedge shape whose height decreases toward the rear. An exhaust hood characterized by:

6. 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, 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. An exhaust hood characterized by:

Images