Exhaust hood

Abstract

To prevent combustion exhaust from leaking between a front cover (30) and a rear plate (10) of an exhaust hood (1) without using a seal member.SOLUTION: If attaching a front cover to a rear plate, the rear plate is surrounded by an upper side frame wall portion (32a), a left side frame wall portion (32b), and a right side frame wall portion (32c) of the front cover. A sound absorption member (20) attached to the rear plate is larger than a distance between the left side frame wall portion and the right side frame wall portion of the front cover, and the front cover is attached to the rear plate while an inner wall surface of the left side frame wall portion, an inner wall surface of the right side frame wall portion, and the sound absorption member are compressed. Therefore, a clearance between left and right ends of the rear plate and the front cover is blocked the compressed sound absorption member, so that it becomes possible to prevent combustion exhaust from leaking out without using a seal member.SELECTED DRAWING: Figure 5

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 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 from the exhaust port can be discharged downward through the space between the front cover and the rear panel. Furthermore, 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.

[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 through the gap between the front cover and rear panel and soil the exterior walls of the building, and adding a sealing member to stop the combustion exhaust leaking would increase the number of parts, which is a problem.

[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 from leaking between the front cover and the rear plate without using a sealing member. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the first exhaust hood of the present invention employs the following configuration: An exhaust hood that is attached to an exterior wall of a building and has a rear plate attached to the exterior wall and a front cover attached to the rear plate to cover the front of the rear plate, and that is attached to the exterior wall to protect a combustion exhaust outlet that opens into the exterior wall from outdoor wind and rain, the rear plate is a rectangular plate-like member having a sound-absorbing member attached to a surface facing the front cover, An upper frame wall portion protruding toward a position higher than the upper end of the rear plate when the front cover is attached to the rear plate, a left frame wall portion protruding toward a position to the left of the left end of the rear plate, and a right frame wall portion protruding toward a position to the right of the right end of the rear plate, the sound absorbing member has a width dimension in the left-right direction set to a dimension larger than the distance between an inner wall surface of the left frame wall portion and an inner wall surface of the right frame wall portion of the front cover, The front cover is attached to the rear panel in a state in which the sound absorbing member is compressed between the inner wall surfaces of the left frame wall portion and the right frame wall portion. It is characterized by:

[0010] In the first exhaust hood of the present invention described above, when the front cover is attached to the rectangular rear plate, the upper, left, and right edges of the rear plate are enclosed by the upper, left, and right frame walls that protrude from the front cover. A sound-absorbing member is attached to the surface of the rear plate facing the front cover, and the width of the sound-absorbing member in the left-right direction is set to be greater than the distance between the inner wall surfaces of the left and right frame walls of the front cover. Therefore, when the front cover is attached with the sound-absorbing member attached to the rear plate, the front cover is attached to the rear plate in a state where the inner wall surfaces of the left and right frame walls compress the sound-absorbing member.

[0011] In this way, the gap between the left frame wall of the front cover and the rear panel, and the gap between the right frame wall and the rear panel are sealed with compressed sound-absorbing material, making it possible to prevent combustion exhaust gas from leaking at least from these locations without using sealing materials.

[0012] Furthermore, in the first exhaust hood of the present invention described above, left-right positioning portions may be erected from the rear panel, and when the sound-absorbing member is attached to the rear panel, the left-right positioning portions may be abutted against left-right abutment portions provided on the sound-absorbing member, thereby positioning the sound-absorbing member in the left-right direction relative to the rear panel.

[0013] This allows the sound-absorbing member to be easily positioned when it is attached to the rear panel. Furthermore, if the sound-absorbing member is positioned in the left-right direction, the left and right sides of the sound-absorbing member can be compressed to the same degree when the front cover is attached. This prevents combustion exhaust gas from leaking from the less compressed side, ensuring a reliable seal against combustion exhaust gas.

[0014] Furthermore, in the first exhaust hood of the present invention described above, left-right abutment portions may be formed on each of the left and right end faces of the sound-absorbing member, and the sound-absorbing material may be positioned in the left-right direction by clamping the left-right abutment portions on both sides of the sound-absorbing member with left-right positioning portions erected at left and right positions on the rear panel.

[0015] In this way, it is only necessary to form left-right contact portions on the left and right end surfaces of the sound absorbing member, so that the sound absorbing member can have a simple shape.

[0016] The second exhaust hood of the present invention has the following configuration: An exhaust hood that is attached to an exterior wall of a building and has a rear plate attached to the exterior wall and a front cover attached to the rear plate to cover the front of the rear plate, and that is attached to the exterior wall to protect a combustion exhaust outlet that opens into the exterior wall from outdoor wind and rain, the rear plate is a rectangular plate-like member having a sound-absorbing member attached to a surface facing the front cover, An upper frame wall portion protruding toward a position higher than the upper end of the rear plate when the front cover is attached to the rear plate, a left frame wall portion protruding toward a position to the left of the left end of the rear plate, and a right frame wall portion protruding toward a position to the right of the right end of the rear plate, the sound-absorbing member is attached to the rear plate in a state in which an upper end of the sound-absorbing member protrudes above an upper end of the rear plate, The front cover is attached to the rear plate in a state in which the inner wall surface of the upper frame wall compresses the sound absorbing member. It is characterized by:

[0017] In the second exhaust hood of the present invention described above, when the front cover is attached to the rectangular rear plate, the upper, left, and right edges of the rear plate are enclosed by the upper frame wall, left frame wall, and right frame wall protruding from the front cover. The sound-absorbing member is attached to the rear plate with its upper edge protruding above the upper edge of the rear plate. Therefore, when the front cover is attached with the sound-absorbing member attached to the rear plate, the front cover is attached to the rear plate with the inner wall surface of the upper frame wall compressing the sound-absorbing member. As a result, the gap between the upper frame wall of the front cover and the rear plate is sealed by the compressed sound-absorbing member, making it possible to prevent combustion exhaust gas from leaking from this area without using a sealing member.

[0018] Furthermore, in the second exhaust hood of the present invention described above, a vertical positioning portion may be erected from the rear plate, and when the sound-absorbing member is attached to the rear plate, the vertical positioning portion may be abutted against a vertical abutment portion provided on the sound-absorbing member, thereby positioning the sound-absorbing member in the vertical direction relative to the rear plate.

[0019] This allows the sound-absorbing member to be easily positioned when attached to the rear panel. Furthermore, the upper end of the sound-absorbing member can be positioned so that it protrudes an appropriate amount from the rear panel, allowing the sound-absorbing member to be compressed to an appropriate degree. As a result, it becomes possible to reliably prevent combustion exhaust gas from leaking out.

[0020] The third exhaust hood of the present invention has the following configuration: An exhaust hood that is attached to an exterior wall of a building and has a rear plate attached to the exterior wall and a front cover attached to the rear plate to cover the front of the rear plate, and that is attached to the exterior wall to protect a combustion exhaust outlet that opens into the exterior wall from outdoor wind and rain, The rear plate has wall-like flange portions provided on the upper end and left and right ends of a rectangular rear plate main body portion, An upper frame wall portion protruding from the front cover toward a position above the flange portion at the upper end of the rear plate when the front cover is attached to the rear plate, a left frame wall portion protruding toward a position to the left of the flange portion at the left end of the rear plate, and a right frame wall portion protruding toward a position to the right of the flange portion at the right end of the rear plate, A sound absorbing member is attached to the inner wall surface of at least one of the upper frame wall portion, the left frame wall portion, and the right frame wall portion of the front cover. The front cover is attached to the rear plate in a state in which the sound absorbing member on the inner wall surface is compressed by the outer surface of the flange portion of the rear plate. It is characterized by:

[0021] In the third exhaust hood of the present invention described above, the rear plate has a shape in which wall-like flange portions are erected from the upper end and left and right ends of a rectangular rear plate main body portion. When the front cover is attached to the rear plate, the rear plate is enclosed by the upper frame wall portion, left frame wall portion, and right frame wall portion that protrude from the front cover. Furthermore, sound-absorbing members are attached to the inner wall surfaces of at least one of the upper frame wall portion, the left frame wall portion, and the right frame wall portion of the front cover. When the front cover is attached to the rear plate, the sound-absorbing members attached to the inner wall surfaces of the front cover are compressed by the outer surfaces of the flange portions of the rear plate.

[0022] In this way, in the area where the sound-absorbing material is attached to the inner wall surface of the upper, left, or right frame wall of the front cover, the gap between the flange of the rear panel and the sound-absorbing material is sealed by the compressed sound-absorbing material, making it possible to prevent combustion exhaust gas from leaking at least from this area without using a sealing material.

[0023] The fourth exhaust hood of the present invention has the following configuration: An exhaust hood that is attached to an exterior wall of a building and has a rear plate attached to the exterior wall and a front cover attached to the rear plate to cover the front of the rear plate, and that is attached to the exterior wall to protect a combustion exhaust outlet that opens into the exterior wall from outdoor wind and rain, A sound absorbing member is attached to the front cover on the surface facing the rear panel. The rear plate has wall-like flange portions extending forward from the upper end and left and right ends of a rectangular rear plate main body portion, The front cover is attached to the rear plate in a state in which the sound absorbing member is compressed by the tip of the flange portion erected from the rear plate. It is characterized by:

[0024] In the third exhaust hood of the present invention described above, the rear panel has wall-like flanges that extend forward from the upper end and left and right ends of the rectangular rear panel main body. The front cover also has sound-absorbing members attached to surfaces facing the rear panel. When the front cover is attached to the rear panel, the sound-absorbing members attached to the front cover are compressed by the tips of the flanges that extend up from the rear panel.

[0025] In this way, the space between the front cover and the tip of the flange part extending from the rear panel is sealed by the compressed sound-absorbing material, making it possible to prevent combustion exhaust gas from leaking at least from this location without using a sealing material. [Brief explanation of the drawings]

[0026] [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] For reference, this is an explanatory diagram illustrating an exhaust hood 9 in which a seal member 93 is interposed between a rear plate 91 and a front cover 92. [Figure 4]1 is an explanatory diagram showing a state in which a sound absorbing plate 20 is positioned and attached to a rear plate 10 of this embodiment. [Figure 5] 10 is an explanatory diagram showing a method of attaching the front cover 30 to the rear plate 10 of the exhaust hood 1 of this embodiment. FIG. [Figure 6] 10 is an explanatory diagram illustrating another aspect of the present embodiment in which the shape of the tip end side of the frame wall portions 32a, 32b, and 32c of the front cover 30 is changed. [Figure 7] 10 is an explanatory diagram showing the reason why a rib 14 is provided to protrude from the upper end of the rear plate 10 and a rib 33 is provided to protrude from the upper end of the front cover 30 in the exhaust hood 1 of this embodiment. FIG. [Figure 8] 10 is an explanatory diagram showing how the sound absorbing plate 20 is positioned and attached to the rear plate 10 of the exhaust hood 1 of the first modified example. FIG. [Figure 9] 10 is an explanatory diagram showing how the sound absorbing plate 20 is positioned and attached to the rear plate 10 in the exhaust hood 1 of another aspect of the first modified example. FIG. [Figure 10] 10 is an explanatory diagram showing a method of attaching the front cover 30 to the rear plate 10 in the exhaust hood 1 of the second modified example. FIG. [Figure 11] 10 is an explanatory diagram showing a method of attaching the front cover 30 to the rear plate 10 in the exhaust hood 1 of the third modified example. FIG. [Figure 12] FIG. 10 is an explanatory diagram of another aspect of the exhaust hood 1 of the third modified example. DETAILED DESCRIPTION OF THE INVENTION

[0027] A. This Example: 1 is an exploded view showing the structure of an exhaust hood 1 of this embodiment. As shown in the figure, the exhaust hood 1 has a structure in which a sheet-metal front cover 30 is attached to the front of a sheet-metal rear plate 10. The rear plate 10 has a rectangular rear plate main body 11 with a round hole 12 formed in the upper part thereof, and the upper end and left and right ends of the rear plate main body 11 are bent toward the rear side to form a wall-like, elongated flange portion 13. A convex rib 14 extending in the longitudinal direction of the flange portion 13 protrudes from the upper surface of the flange portion 13 formed at the upper end (hereinafter referred to as flange portion 13a).

[0028] The rear panel main body 11 is cut and raised toward the front, forming rectangular support plates 18 at the upper left and upper right corners of the rear panel main body 11. Mounting holes 17 are formed at the upper left and upper right corners outside the support plates 18 for mounting the rear panel 10 to the exterior wall 2 of the building. A cylindrical mounting tube 15 is inserted into a round hole 12 formed in the top of the rear panel main body 11, and the tip of the mounting tube 15 protrudes from the back of the rear panel main body 11. An annular flange 15a protrudes from the side of the mounting tube 15, and the mounting tube 15 is attached with the flange 15a abutting against the rear panel main body 11. Therefore, the rear end of the mounting tube 15 protrudes toward the front from the rear panel main body 11, forming a cylindrical protrusion 19. The lower end of the rear panel main body 11 is bent diagonally forward to form an elongated protective plate 16.

[0029] A rectangular sound-absorbing panel 20 made of glass wool is attached to the front side of the rear panel main body 11. The upper left and upper right corners of the sound-absorbing panel 20 are each cut out in a rectangular shape to form cutouts 20b. When attaching the rear panel 10 to the exterior wall 2 of a building, screws (not shown) are inserted into the mounting holes 17 through these cutouts 20b. Furthermore, flat abutment surfaces 20c are formed on the left and right sides of the sound-absorbing panel 20 in the areas cut out by the cutouts 20b, and the distance between the left and right abutment surfaces 20c is set to be the same as the distance between the left and right support panels 18 erected from the rear panel main body 11 of the rear panel 10. A circular insertion window 20a is formed in the upper part of the sound-absorbing panel 20. The sound-absorbing panel 20 of this embodiment corresponds to the "sound-absorbing member" of the present invention.

[0030] When attaching the sound-absorbing panel 20 to the rear panel 10, the cylindrical protrusions 19 protruding from the rear panel 10 are inserted into the insertion windows 20a of the sound-absorbing panel 20, and the sound-absorbing panel 20 is attached so that the abutment surfaces 20c of the notches 20b at the upper left and upper right corners of the sound-absorbing panel 20 are sandwiched between the support plates 18 erected at the upper left and upper right corners of the rear panel 10. As described above, the distance between the left and right abutment surfaces 20c of the sound-absorbing panel 20 is set to be the same as the distance between the left and right support plates 18 of the rear panel 10, so the sound-absorbing panel 20 is positioned in the left-right direction by the support plates 18 of the rear panel 10. Therefore, in the exhaust hood 1 of this embodiment, the support plates 18 of the rear panel 10 correspond to the "left-right positioning portion" in the present invention, and the abutment surfaces 20c of the sound-absorbing panel 20 correspond to the "left-right abutment portion" in the present invention.

[0031] Furthermore, when the sound-absorbing panel 20 is attached to the rear panel 10, the sound-absorbing panel 20 tends to lower due to its own weight, and is positioned in the vertical direction by the upper part of the inner circumferential surface of the insertion window 20a of the sound-absorbing panel 20 abutting against the upper surface of the cylindrical protrusion 19 that protrudes from the rear panel 10. Therefore, in the exhaust hood 1 of this embodiment, the protrusion 19 of the rear panel 10 corresponds to the "vertical positioning portion" in the present invention, and the insertion window 20a of the sound-absorbing panel 20 corresponds to the "vertical abutment portion" in the present invention.

[0032] The front cover 30 has a shape in which a wall-like, elongated frame wall portion 32 extends from the upper end and left and right ends of a rectangular cover main body 31 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 31 are bent to form a left-end frame wall portion 32b and a right-end frame wall portion 32c. A sheet metal bottom plate 34 is attached to the lower end of the cover main body 31. A plurality of wind direction plates 34a are formed by cutting and raising the bottom plate 34, and a plurality of ventilation windows 34b are formed in the raised portions of the wind direction plates 34a. In this embodiment, the frame wall portion 32a at the upper end of the front cover 30 corresponds to the "upper frame wall portion" in the present invention, the frame wall portion 32b at the left end corresponds to the "left frame wall portion" in the present invention, and the frame wall portion 32c at the right end corresponds to the "right frame wall portion" in the present invention.

[0033] Furthermore, an upper frame wall portion 32a is attached to the upper end of the cover main body portion 31 so as to close the gap between the left frame wall portion 32b and the right frame wall portion 32c. A convex rib 33 extending in the longitudinal direction of the frame wall portion 32a is formed on the upper surface of the upper frame wall portion 32a, and accordingly, the back side of the rib 33 forms a groove-like shape where the lower surface of the frame wall portion 32a is recessed. The length and size of the groove are such that the rib 14 protruding from the flange portion 13a at the upper end of the rear panel 10 fits perfectly into the groove.

[0034] Furthermore, the distance between the frame wall portions 32b, 32c formed on the left and right ends of the front cover 30 is greater than the distance between the outer surfaces of the flange portions 13b, 13c formed on the left and right ends of the rear panel 10. Therefore, the front cover 30 can be attached to the rear panel 10 from the front with the flange portions 13a, 13b, 13c of the rear panel 10 housed inside the frame wall portions 32a, 32b, 32c.

[0035] A rectangular sound-absorbing panel 21 made of glass wool is also attached to the rear side of the cover main body 31 (the side facing the rear panel 10). The width of the sound-absorbing panel 21 is set to a dimension that matches the distance between the frame wall portions 32 formed on the left and right ends of the cover main body 31. The sound-absorbing panel 21 is attached to the cover main body 31 in a state where it is positioned by the frame wall portion 32a formed on the upper end of the cover main body 31 and the frame wall portions 32b, 32c formed on the left and right ends. In addition, a protrusion 21a that protrudes toward the rear panel 10 is formed on the upper end of the sound-absorbing panel 21, and when the sound-absorbing panel 21 is attached to the front cover 30, the inner surface of the frame wall portion 32a on the upper end side of the front cover 30 is covered by the protrusion 21a protruding from the sound-absorbing panel 21.

[0036] 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 15 (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.

[0037] 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 20, 21 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 34 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.

[0038] 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 30 and the rear panel 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 panel 91 and the front cover 92, respectively, and then attach the front cover 92 to the rear panel 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 panel 91, it requires the sealing member 93, which increases the number of parts. In addition, the need to form flanges 91a and 92a on the outer peripheries of the rear panel 91 and the front cover 92 complicates the structure of the exhaust hood 9. Furthermore, 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, there is a risk that attaching the exhaust hood 9 to the exterior wall 2 of the building will spoil the impression of the building.

[0039] Therefore, in the exhaust hood 1 of this embodiment, the left-right dimension of the sound-absorbing panel 20 is set to be wider than the left-right dimension of the rear panel 10, and the sound-absorbing panel 20 is attached to the rear panel 10 in the following state. Figure 4 is an explanatory diagram showing the state in which the sound-absorbing panel 20 is attached to the rear panel 10 in the exhaust hood 1 of this embodiment. As shown in Figure 4(a), the sound-absorbing panel 20 is positioned in the left-right direction by the support plate 18 of the rear panel 10 abutting against the abutment surface 20c of the sound-absorbing panel 20, and is attached in a state in which it is positioned in the up-down direction by the upper surface of the protrusion 19 of the rear panel 10 abutting against the upper part of the inner circumferential surface of the insertion window 20a (see Figure 1) of the sound-absorbing panel 20. When the sound-absorbing panel 20 is attached to the rear panel 10 in this manner, in the exhaust hood 1 of this embodiment, the upper end of the sound-absorbing panel 20 is higher than the flange portion 13a on the upper end side of the rear panel 10, and the left and right ends of the sound-absorbing panel 20 are also located outside the left and right flange portions 13b, 13c of the rear panel 10 (see Figure 1).

[0040] FIG. 4(b) shows the upper part of the rear panel 10 as viewed from the rear side (from the direction of arrow P in FIG. 4(a)). As shown in FIG. 4(b), the sound-absorbing panel 20 is positioned in the left-right direction by the left and right abutment surfaces 20c abutting against the left and right support panels 18 erected from the rear panel 10. As a result, the left and right ends of the sound-absorbing panel 20 are positioned outward from the flange portion 13b on the left end side and the flange portion 13c on the right end side of the rear panel 10 by the same distance. In addition, the sound-absorbing panel 20 is positioned in the up-down direction by the upper part of the inner wall surface of the insertion window 20a abutting against the upper surface of a cylindrical protrusion 19 protruding from the rear panel 10. As a result, the upper end of the sound-absorbing panel 20 is positioned higher than the flange portion 13a on the upper end side of the rear panel 10.

[0041] 5A and 5B are explanatory diagrams showing how the front cover 30 is attached to the rear panel 10 of the exhaust hood 1 of this embodiment. Fig. 5A shows how the front cover 30 is brought close to the rear panel 10. As described above, the width dimension W1 of the left and right ends of the sound-absorbing panel 20 is set to a value larger than the width dimension W2 of the left and right ends of the rear panel 10, but the width dimension W1 is set to a value larger than the distance W3 between the inner wall surfaces of the frame wall portions 32b and 32c formed at the left and right ends of the front cover 30.

[0042] Therefore, as the front cover 30 is brought closer to the rear panel 10, the left and right frame wall portions 32b, 32c of the front cover 30 eventually interfere with the left and right ends of the sound-absorbing panel 20. Thereafter, as shown in FIG. 5(b), the frame wall portions 32b, 32c of the front cover 30 compress the left and right ends of the sound-absorbing panel 20 inward, bending the left and right ends of the sound-absorbing panel 20 rearward (downward in FIG. 5), as the front cover 30 approaches the rear panel 10. Then, when the front cover 30 is attached to the rear panel 10, as shown in FIG. 5(c), both ends of the sound-absorbing panel 20 are firmly pressed against the inner wall surfaces of the frame wall portions 32b, 32c of the front cover 30, forming a sealed state. This makes it possible to prevent combustion exhaust gas from leaking between the left and right frame wall portions 32b, 32c of the front cover 30 and the left and right flange portions 13b, 13c of the rear panel 10.

[0043] The same applies to the left and right ends of the sound-absorbing panel 20. That is, since the upper end of the sound-absorbing panel 20 protrudes above the flange portion 13a at the upper end of the rear panel 10, when the front cover 30 is attached, the upper end of the sound-absorbing panel 20 is compressed by the frame wall portion 32a at the upper end of the front cover 30. As a result, when the front cover 30 is attached to the rear panel 10, the upper end of the sound-absorbing panel 20 is pressed firmly against the inner wall surface of the frame wall portion 32a of the front cover 30, creating a sealed state. This makes it possible to prevent combustion exhaust gas from leaking out from between the frame wall portion 32a at the upper end of the front cover 30 and the flange portion 13a at the upper end of the rear panel 10.

[0044] The leading ends of the frame wall portions 32a, 32b, and 32c of the front cover 30 may be rounded outward as shown in Fig. 6(a) or opened outward as shown in Fig. 6(b). In this way, as shown in Fig. 5(b), when attaching the front cover 30 to the rear panel 10, the leading ends of the frame wall portions 32a, 32b, and 32c will not get caught on the sound-absorbing panel 20, making it possible to easily attach the front cover 30.

[0045] As described above with reference to FIG. 1 , the exhaust hood 1 of this embodiment has a rib 14 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 33 that protrudes from the upper surface of the frame wall portion 32a at the upper end of the front cover 30 and extends in the longitudinal direction of the frame wall portion 32a also protrudes. Accordingly, the back side of the rib 33 forms a groove in which the lower surface of the frame wall portion 32a is recessed. The length and size of the groove are such that the rib 14 that protrudes from the flange portion 13a of the rear panel 10 fits perfectly into the groove. As described below, these ribs 14 and 33 are provided to easily position the front cover 30 relative to the rear panel 10 and also to allow the sound-absorbing panel 20 to be deformed with little force when attaching the front cover 30.

[0046] Figure 7 is an explanatory diagram showing a method for attaching the front cover 30 of the exhaust hood 1 of this embodiment to the rear panel 10. When attaching the front cover 30 to the rear panel 10, as shown in Figure 7(a), the front cover 30 is tilted so that the bottom end of the front cover 30 projects forward (to the left on the page of Figure 7), and the front cover 30 is then brought closer to the rear panel 10 from above. At this time, if the ribs 33 protruding from the frame wall portion 32a of the front cover 30 are aligned with the ribs 14 protruding from the top of the rear panel 10, the ribs 14 of the rear panel 10 will fit into the recessed grooves on the backside of the ribs 33, and the front cover 30 will be positioned relative to the rear panel 10 in the front-to-back direction (left-to-right on the page of Figure 7) and the left-to-right direction (directions perpendicular to the page of Figure 7). Furthermore, because the upper end of the sound-absorbing panel 20 protrudes above the flange portion 13a of the rear panel 10, when the rib 14 of the rear panel 10 is fitted into the groove on the back side of the rib 33, the frame wall portion 32a of the front cover 30 compresses the upper end of the sound-absorbing panel 20. Furthermore, because the sound-absorbing panel 20 is wider than the rear panel 10, fitting the rib 14 of the rear panel 10 into the groove on the back side of the rib 33 requires the left and right frame wall portions 32b, 32c of the front cover 30 to compress the left and right ends of the sound-absorbing panel 20. However, as described above with reference to FIG. 1 , because the notches 20b are formed in the upper left and right corners of the sound-absorbing panel 20, only a small area is required to actually compress the left and right ends of the sound-absorbing panel 20. Therefore, the rib 14 of the rear panel 10 can be fitted into the groove on the back side of the rib 33 with little force.

[0047] Next, the lower part of the front cover 30 is pushed toward the rear panel 10, thereby rotating the front cover 30 around the vicinity of the protruding rib 33 at the top end of the front cover 30. The hatched arrow in FIG. 7(b) indicates that the lower part of the front cover 30 is being pushed toward the rear panel 10. As the front cover 30 is rotated around the vicinity of the rib 33 at the top end, the position (point P in FIG. 7(b)) where the left and right frame wall portions 32b, 32c of the front cover 30 compress both sides of the sound-absorbing panel 20 gradually moves downward. In other words, rather than compressing the entire left and right ends of the sound-absorbing panel 20 simultaneously, the compression position (point P) can be moved while gradually compressing both ends of the sound-absorbing panel 20, allowing for compression with a small force. In addition, by pushing the lower part of the front cover 30 as shown in FIG. 8(b), the force required to compress both ends of the sound-absorbing panel 20 is further reduced due to the principle of leverage. Then, the front cover 30 is rotated until the bottom plate 34 attached to the lower end of the front cover 30 abuts against the lower part of the rear plate 10, and the attachment of the front cover 30 is completed.

[0048] As described above in detail, in the exhaust hood 1 of this embodiment, when the front cover 30 is attached to the rear plate 10, the upper end and the left and right ends of the sound-absorbing plate 20 attached to the rear plate 10 are firmly pressed against the inner wall surfaces of the frame wall portions 32a, 32b, and 32c of the front cover 30, and the gap between the front cover 30 and the rear plate 10 can be blocked by the sound-absorbing plate 20. This makes it possible to prevent combustion exhaust gas from leaking between the front cover 30 and the rear plate 10 without interposing a sealing member between the front cover 30 and the rear plate 10. In addition, as shown in FIG. 3 , there is no need to provide flanges 92a, 91a on the front cover 92 and the rear plate 91, so the structure of the exhaust hood 1 does not become complicated, and further, there is no risk that the sealing member 93 sandwiched between the flanges 92a and 91a will be visible from the outside of the exhaust hood 9, which would detract from the aesthetic appearance.

[0049] 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 sound-absorbing panel 20 is positioned in the left-right direction using the support plate 18 erected from the rear panel 10, and the sound-absorbing panel 20 is positioned in the up-down direction using the cylindrical protrusion 19 erected from the rear panel 10. However, the member for positioning the sound-absorbing panel 20 in the left-right direction and the member for positioning it in the up-down direction do not necessarily need to be separate members.

[0050] 8A and 8B are explanatory diagrams of a first modified example in which a sound-absorbing panel 20 is positioned in the left-right and up-down directions using support plates 18 extending from the rear panel 10. As shown in FIG. 8A, the rear panel 10 of the first modified example has L-shaped support plates 18 protruding from both sides of a circular hole 12 opening in the center, slightly upward. While the present embodiment described above had cylindrical protrusions 19 protruding from the circular hole 12, the first modified example does not have any protrusions 19. Furthermore, the sound-absorbing panel 20 has rectangular insertion holes 22 formed on both sides of a central insertion window 20a opening in the center, slightly upward. The sound-absorbing panel 20 is attached to the rear panel 10 by inserting the support plates 18 protruding from the rear panel 10 into the insertion holes 22 of the sound-absorbing panel 20.

[0051] FIG. 8(b) shows the sound-absorbing board 20 attached to the rear panel 10, viewed from the front (the direction indicated by arrow B in FIG. 8(a)). As shown in the figure, the two support plates 18 protruding from the rear panel 10 have their side surfaces 18a abutting against the inner surfaces 22a of the insertion holes 22, so that the support plates 18 inserted into the two insertion holes 22 sandwich the sound-absorbing board 20 and position it in the left-right direction. The top surfaces 18b of the two support plates 18 also abut against the inner surfaces 22b above the insertion holes 22, so that the two support plates 18 support the sound-absorbing board 20 at the insertion holes 22, thereby positioning the sound-absorbing board 20 in the up-down direction. In this way, the sound-absorbing board 20 can be positioned in the left-right and up-down directions without using separate members for positioning in the left-right direction and for positioning in the up-down direction.

[0052] In the first modified example, the side surface 18a of the support plate 18 corresponds to the "left-right positioning portion" in the present invention, and the inner surface 22a of the insertion hole 22 corresponds to the "left-right abutment portion" in the present invention. Also, the upper surface 18b of the support plate 18 corresponds to the "vertical positioning portion" in the present invention, and the upper inner surface 22b of the insertion hole 22 corresponds to the "vertical abutment portion" in the present invention.

[0053] In the first modified example described above, the sound-absorbing panel 20 is positioned using two support plates 18. However, it is also possible to combine the two support plates 18 into one. That is, as shown in FIG. 9( a), two plates are butted together at a right angle and welded to form a support plate 18 having a T-shaped cross section. This support plate 18 is erected from one location on the rear panel main body 11 of the rear panel 10 so that one of the plates is horizontal. In the example shown in FIG. 9( a), the support plate 18 is erected below the circular hole 12 opening in the center of the rear panel main body 11, but the support plate 18 may be erected from any location on the rear panel main body 11. Furthermore, an insertion hole 22 having a shape matching the cross-sectional shape of the support plate 18 is formed in the sound-absorbing panel 20 at a position corresponding to the support plate 18. When the sound absorbing plate 20 is attached to the rear plate 10, the support plate 18 protruding from the rear plate 10 is inserted into the insertion hole 22 of the sound absorbing plate 20.

[0054] FIG. 9(b) shows the shape of the insertion hole 22 as viewed from the direction of arrow C in FIG. 9(a). As shown in FIG. 9(b), the shape of the insertion hole 22 is such that the width b of the portion corresponding to the horizontal bar of the T is larger than the width a of the portion corresponding to the vertical bar of the T. Furthermore, the dimension of the width a is set to be the same dimension as the thickness of the support plate 18 of the rear panel 10. Therefore, when the support plate 18 is inserted into the insertion hole 22, both side surfaces 18a (see FIG. 9(a)) of the vertical plate material of the support plate 18 abut against the inner surfaces 22a (see FIG. 9(b)) on both sides of the insertion hole 22, thereby positioning the sound-absorbing panel 20 in the left-right direction. Furthermore, the upper surface 18b (see FIG. 9(a)) of the horizontal plate material of the support plate 18 abuts against the inner surfaces 22b (see FIG. 9(b)) at the upper end of the insertion hole 22, thereby positioning the sound-absorbing panel 20 in the up-down direction. In this way, it is possible to position the sound-absorbing panel 20 in the left-right direction and the up-down direction using a single support plate 18. In the example shown in Fig. 9, both side surfaces 18a of the support plate 18 correspond to the "left-right positioning portions" of the present invention, and the inner surfaces 22a on both sides of the insertion hole 22 correspond to the "left-right abutment portions" of the present invention. Also, the upper surface 18b of the support plate 18 corresponds to the "up-down positioning portions" of the present invention, and the inner surfaces 22b at the upper ends of the insertion holes 22 correspond to the "up-down abutment portions" of the present invention.

[0055] C. Second Variant: In the above-described embodiment and first modified example, the frame wall portions 32a, 32b, and 32c of the front cover 30 are described as compressing the sound-absorbing panel 20 attached to the rear panel 10, thereby sealing the gap between the front cover 30 and the rear panel 10. However, the flange portions 13a, 13b, and 13c of the rear panel 10 may compress the sound-absorbing panel attached to the front cover 30, thereby sealing the gap between the front cover 30 and the rear panel 10.

[0056] 10 is an explanatory diagram showing how the front cover 30 is attached to the rear panel 10 in the exhaust hood 1 of the second modified example. As shown in FIG. 10(a), in the exhaust hood 1 of the second modified example, rectangular sound-absorbing panels 23 are also attached to the inner wall surfaces of the frame wall portions 32b, 32c of the front cover 30. Furthermore, the distance W4 between the left and right sound-absorbing panels 23 is set to a value that is smaller than the left-right width W2 of the rear panel 10 but larger than the left-right width W1 of the sound-absorbing panel 20 attached to the rear panel 10. In the second modified example, the sound-absorbing panels 23 correspond to the "sound-absorbing member" in the present invention.

[0057] In this second modified example, as the front cover 30 is brought closer to the rear panel 10, as shown in FIG. 10(b), the sound-absorbing panels 23 attached to the inner wall surfaces of the frame wall portions 32b and 32c of the front cover 30 interfere with the left and right ends of the rear panel 10 and are compressed toward the frame wall portions 32b and 32c by the flange portions 13b and 13c of the rear panel 10. Then, when the front cover 30 is attached to the rear panel 10, as shown in FIG. 10(c), the gaps between the left and right frame wall portions 32b and 32c of the front cover 30 and the left and right flange portions 13b and 13c of the rear panel 10 are closed and sealed by the compressed sound-absorbing panels 23. This makes it possible to prevent combustion exhaust gas from leaking out without interposing a sealing member between the front cover 30 and the rear panel 10.

[0058] 10 has been described with reference to the case where gaps between the frame wall portions 32b, 32c of the front cover 30 and the left and right flange portions 13b, 13c of the rear panel 10 are sealed by attaching sound-absorbing panels 23 to the inner wall surfaces of the left and right frame wall portions 32b, 32c of the front cover 30. Similarly, the gap between the frame wall portion 32a at the upper end of the front cover 30 and the flange portion 13a at the upper end of the rear panel 10 can be sealed by attaching the sound-absorbing panels 23 to the inner wall surface of the frame wall portion 32a of the front cover 30. Alternatively, instead of attaching the sound-absorbing panels 23 to the inner wall surface of the frame wall portion 32a of the front cover 30, the tips of the convex portions 21a of the sound-absorbing panels 21 may be extended to the top of the flange portion 13a of the rear panel 10. Even in this way, by compressing the tip of the convex portion 21a of the sound-absorbing panel 21 between the frame wall portion 32a of the front cover 30 and the flange portion 13a of the rear panel 10, it is possible to seal the gap between the frame wall portion 32a of the front cover 30 and the flange portion 13a of the rear panel 10.

[0059] D. Third Variant: In the above-described embodiment and various modified examples, the gap between the front cover 30 and the rear panel 10 is sealed by compressing the sound-absorbing panel 20 or the sound-absorbing panel 23 between the inner wall surfaces of the frame wall portions 32a, 32b, 32c of the front cover 30 and the outer surfaces of the flange portions 13a, 13b, 13c of the rear panel 10. However, the gap between the front cover 30 and the rear panel 10 may also be sealed by compressing the sound-absorbing panel 21 attached to the front cover 30 with the tips of the flange portions 13a, 13b, 13c of the rear panel 10.

[0060] Figure 11 is an explanatory diagram showing how the front cover 30 is attached to the rear plate 10 in the exhaust hood 1 of the third modified example. As shown in Figure 11(a), in the exhaust hood 1 of the third modified example, the tips of the flange portions 13b, 13c of the rear plate 10 extend toward the front cover 30. In addition, the sound-absorbing panel 21 attached to the front cover 30 extends to the position of the inner wall surfaces of the frame wall portions 32b, 32c of the front cover 30. In the third modified example, the sound-absorbing panel 21 corresponds to the "sound-absorbing member" in the present invention.

[0061] In the third modified example, when the front cover 30 is brought closer to the rear panel 10, as shown in Fig. 11(b), the tips of the flanges 13b, 13c of the rear panel 10 come into contact with the sound-absorbing panel 21 of the front cover 30, compressing the sound-absorbing panel 21. As a result, the gap between the flanges 13b, 13c of the rear panel 10 and the front cover 30 is closed and sealed, preventing the combustion exhaust from leaking out.

[0062] 11 has been described for the left and right flange portions 13b, 13c of the rear panel 10, but the same applies to the flange portion 13a at the top end of the rear panel 10. That is, if the tip of the flange portion 13a of the rear panel 10 is extended toward the front cover 30, when the front cover 30 is attached to the rear panel 10, the tip of the flange portion 13a will compress the sound-absorbing panel 21 of the front cover 30, creating a sealed state, thereby preventing leakage of combustion exhaust gas. Therefore, it is possible to prevent leakage of combustion exhaust gas without interposing a sealing member between the front cover 30 and the rear panel 10.

[0063] In the exhaust hood 1 of the third modified example described above, as shown in FIG. 12, the tips of the left and right flanges 13b, 13c of the rear panel 10 may be bent to form contact portions 13d that contact the sound-absorbing panel 21. Furthermore, the flange 13a at the upper end of the rear panel 10 may also have a contact portion 13d formed at the tip of the flange 13a. In this way, the sound-absorbing panel 21 is compressed by the width of the contact portion 13d, thereby ensuring a sufficient sealing width. As a result, it is possible to more reliably prevent the combustion exhaust gas from leaking.

[0064] 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]

[0065] 1...exhaust hood, 2...exterior wall, 3...exhaust port, 9...exhaust hood, 10... rear plate; 11... rear plate main body; 12... round hole; 13a, 13b, 13c... flange portion; 13d... abutment portion; 14... rib; 15...mounting tube, 15a...flange, 16...protective plate portion, 17...mounting hole, 18...Support plate, 18a...Side surface, 18b...Top surface, 19...Protrusion part, 20...sound-absorbing plate, 20a...insertion window, 20b...notch portion, 20c...contact surface, 21...sound absorbing plate, 21a...protrusion, 22...insertion hole, 22a, 22b...inner surface, 23...sound-absorbing plate, 30...front cover, 31... Cover main body portion; 32a, 32b, 32c... Frame wall portion; 33... Rib; 34...bottom plate, 34a...wind deflector, 34b...ventilation window.

Claims

1. An exhaust hood that is attached to an exterior wall of a building and has a rear plate attached to the exterior wall and a front cover attached to the rear plate to cover the front of the rear plate, and that is attached to the exterior wall to protect a combustion exhaust outlet that opens into the exterior wall from outdoor wind and rain, the rear plate is a rectangular plate-like member having a sound-absorbing member attached to a surface facing the front cover, An upper frame wall portion protruding toward a position higher than the upper end of the rear plate when the front cover is attached to the rear plate, a left frame wall portion protruding toward a position to the left of the left end of the rear plate, and a right frame wall portion protruding toward a position to the right of the right end of the rear plate, the sound absorbing member has a width dimension in the left-right direction set to a dimension larger than the distance between an inner wall surface of the left frame wall portion and an inner wall surface of the right frame wall portion of the front cover, The front cover is attached to the rear panel in a state in which the sound absorbing member is compressed between the inner wall surfaces of the left frame wall portion and the right frame wall portion. An exhaust hood characterized by:

2. 2. The exhaust hood of claim 1, a left-right positioning portion that abuts against the sound-absorbing member to position the sound-absorbing member in the left-right direction is provided upright from the rear plate; The sound absorbing member is formed with a left-right contact portion that contacts the left-right positioning portion. An exhaust hood characterized by:

3. 3. The exhaust hood of claim 2, The sound absorbing member has the left-right contact portions formed on a left end surface and a right end surface of the sound absorbing member, the rear panel has left-right positioning portions that are erected at a plurality of positions corresponding to the left-right contact portions formed on both sides of the sound absorbing member, The left-right positioning portions position the sound absorbing member in the left-right direction by sandwiching the sound absorbing member with the left-right contact portions formed on both sides of the sound absorbing member. An exhaust hood characterized by:

4. An exhaust hood that is attached to an exterior wall of a building and has a rear plate attached to the exterior wall and a front cover attached to the rear plate to cover the front of the rear plate, and that is attached to the exterior wall to protect a combustion exhaust outlet that opens into the exterior wall from outdoor wind and rain, the rear plate is a rectangular plate-like member having a sound-absorbing member attached to a surface facing the front cover, An upper frame wall portion protruding toward a position higher than the upper end of the rear plate when the front cover is attached to the rear plate, a left frame wall portion protruding toward a position to the left of the left end of the rear plate, and a right frame wall portion protruding toward a position to the right of the right end of the rear plate, the sound absorbing member is attached to the rear plate in a state in which an upper end of the sound absorbing member protrudes above an upper end of the rear plate, The front cover is attached to the rear plate in a state in which the inner wall surface of the upper frame wall compresses the sound absorbing member. An exhaust hood characterized by:

5. 5. The exhaust hood of claim 4, a vertical positioning portion that abuts against the sound absorbing member to position the sound absorbing member in the vertical direction is provided on the rear plate; The sound absorbing member is formed with a vertical contact portion that contacts the vertical positioning portion. An exhaust hood characterized by:

6. An exhaust hood that is attached to an exterior wall of a building and has a rear plate attached to the exterior wall and a front cover attached to the rear plate to cover the front of the rear plate, and that is attached to the exterior wall to protect a combustion exhaust outlet that opens into the exterior wall from outdoor wind and rain, The rear plate has wall-like flange portions provided on the upper end and left and right ends of a rectangular rear plate main body portion, An upper frame wall portion protruding from the front cover toward a position above the flange portion at the upper end of the rear plate when the front cover is attached to the rear plate, a left frame wall portion protruding toward a position to the left of the flange portion at the left end of the rear plate, and a right frame wall portion protruding toward a position to the right of the flange portion at the right end of the rear plate, a sound-absorbing member is attached to an inner wall surface of at least one of the upper frame wall portion, the left frame wall portion, and the right frame wall portion of the front cover; The front cover is attached to the rear plate in a state in which the sound absorbing member on the inner wall surface is compressed by the outer surface of the flange portion of the rear plate. An exhaust hood characterized by:

7. An exhaust hood that is attached to an exterior wall of a building and has a rear plate attached to the exterior wall and a front cover attached to the rear plate to cover the front of the rear plate, and that is attached to the exterior wall to protect a combustion exhaust outlet that opens into the exterior wall from outdoor wind and rain, a sound absorbing member is attached to the front cover on a surface facing the rear panel; The rear plate has wall-like flange portions extending forward from the upper end and left and right ends of a rectangular rear plate main body portion, The front cover is attached to the rear plate in a state in which the sound absorbing member is compressed by the tip of the flange portion erected from the rear plate. An exhaust hood characterized by:

Images