Exhaust hood

Abstract

To provide an exhaust hood whose base can be tightly and stably fixed to a wall face without ablating a portion projecting from a wall face of a ventilation duct when the exhaust hood is mounted to an opening end of the ventilation duct.SOLUTION: An exhaust hood comprises: a base 1, on which a hole 11a communicated with a ventilation duct is formed; and a box-shaped cover 2 covering the base 1 except for a lower part of the base 1. The base 1 comprises: a back plate 11, on which a hole 11a communicated with the ventilation duct is formed; two side bending pieces 12 respectively bent from both sides of the back plate 11 to a wall face side; an upper bending piece 13 sequentially bent from the upper part of the back plate 11 toward the wall face side, the upper side and the cover 2 side to form a wall face ground part 13a; and a water drip piece 14 sequentially bent diagonally downward from the lower part of the back plate 11 toward the wall face side, the lower side and the cover 2 side to form a wall face ground part 14a.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an exhaust hood attached to an opening end of a ventilation duct that opens facing a wall surface.

Background Art

[0002] Conventionally, as an exhaust hood attached to an opening end of a ventilation duct that opens facing a wall surface, an exhaust hood including a base integrally formed of sheet metal with a hole formed to communicate with the ventilation duct and a box-shaped cover formed of sheet metal that covers the base except for the lower part of the base has been used (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, due to construction reasons, the tip of a ventilation duct that opens facing a wall surface is provided so as to protrude slightly from the wall surface. Therefore, when attaching the exhaust hood described in Patent Document 1 to the opening end of the ventilation duct, in order to fix the wall surface fixing plate of the base in close contact with the wall surface, it is necessary to cut off the portion protruding from the wall surface of the ventilation duct, which causes a problem that the construction is troublesome. Moreover, when not cutting off the portion protruding from the wall surface of the ventilation duct, the wall surface fixing plate of the base will not be fixed in close contact with the wall surface, so it is necessary to perform caulking treatment on the gap, which causes a problem that the construction is troublesome.

[0005] In view of the problems of the conventional exhaust hoods described above, the present invention aims to provide an exhaust hood that, when attached to the opening end of a ventilation duct, allows the base to be firmly attached to the wall surface without having to cut off the portion that protrudes from the wall surface of the ventilation duct, and to be stably fixed in contact with the wall surface. [Means for solving the problem]

[0006] To achieve the above objective, the exhaust hood of the present invention is An exhaust hood that is attached to the opening end of a ventilation duct that opens facing a wall, A base having a hole formed therein for communication with the aforementioned ventilation duct, The base is provided with a box-shaped cover that covers the base except for the lower part, The aforementioned base is A back plate having a hole formed therein for communication with the aforementioned ventilation duct, Two side bent pieces are bent from both sides of the back panel toward the wall surface, An upper bent piece is formed by folding the back plate in order from the top to the wall side, the upper side, and the cover side to form a wall-contact portion, A draining piece is formed by sequentially bending the lower part of the back plate so as to protrude diagonally downward toward the wall, the bottom, and the cover, thereby forming a wall-contact portion. Equipped with, The aforementioned cover is Front panel and Two side bent pieces are bent from both sides of the front panel toward the wall surface, The upper panel portion includes an upper bent piece that is bent from the upper part of the front panel toward the wall surface, Equipped with, The outer surfaces of the two side bent pieces and the upper bent piece of the base and the inner surfaces of the two side bent pieces and the upper plate portion of the cover are made to be in surface contact with each other when the cover is mounted on the base. It is characterized by the following:

[0007] In this case, the upper fixing part is configured such that the upper locking piece formed in the cover is inserted into a locking hole formed in the upper bent piece of the base, which has a spring-like retaining piece formed by bending the upper bent piece. The lower fixing portion can be configured by screwing the lower locking piece formed on the cover to the drain piece of the base.

[0008] Furthermore, the bending position of the base, from the lower part of the back plate toward the wall surface, can be shifted so that the central part is lower than the side parts, and a drain hole can be formed at the boundary of the bending position. [Effects of the Invention]

[0009] According to the exhaust hood of the present invention, when attaching the exhaust hood to the open end of a ventilation duct, the base can be firmly attached to the wall surface and securely fixed without having to cut off the portion of the ventilation duct that protrudes from the wall surface. [Brief explanation of the drawing]

[0010] [Figure 1] An embodiment of the exhaust hood of the present invention is shown, where (a) is a side cross-sectional view and (b) is a bottom view. [Figure 2] This is a front view showing the exhaust hood. [Figure 3] The exhaust hood is shown, with (a) being a bottom view and (b) being a rear view. [Figure 4] The base and cylindrical member of the exhaust hood are shown, with (a) being a front view, (b) a side view, and (c) a side cross-sectional view. [Figure 5] The base and cylindrical members of the exhaust hood are shown, with (a) being a bottom view and (b) being a rear view. [Figure 6] The base of the exhaust hood is shown, with (a) being a front view, (b) a side view, and (c) a side cross-sectional view. [Figure 7] This is a plan view showing the base of the exhaust hood. [Figure 8]The cylindrical member of the common exhaust hood is shown, where (a) is a front view, (b) is a side view, and (c) is a side sectional view. [Figure 9] The cover of the common exhaust hood is shown, where (a) is a side sectional view and (b) is a rear view. [Figure 10] It is a plan view showing the cover of the common exhaust hood. [Figure 11] The cover body of the common exhaust hood is shown, where (a) is a plan view and (b) is a rear view. [Figure 12] The cover top plate and vibration damping material of the common exhaust hood are shown, where (a) is a plan view, (b) is a rear view, and (c) is a bottom view. [Figure 13] The top plate for preventing rain noise of the common exhaust hood is shown, where (a) is a plan view and (b) is a rear view. [Figure 14] The gallery of the common exhaust hood is shown, where (a) is a plan view, (b) is a side view, (c) is a side sectional view, and (d) is a plan view before bending the flow rectifying piece.

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the exhaust hood of the present invention will be described based on the drawings.

[0012] [[ID=3,0]]Figures 1 to 14 show an embodiment of the exhaust hood of the present invention. This exhaust hood is mounted on the open end of a ventilation duct that opens facing a wall surface, and includes a base 1 formed with a hole for communicating with the ventilation duct, a box-shaped cover 2 that covers the base 1 except for the lower part of the base 1, and a gallery 4 that covers the lower part of the cover 2 (base 1). The base 1 and the cover 2 can be manufactured by sheet metal processing and / or press processing a stainless steel sheet material such as SUS304 with a thickness of about 0.5 mm.

[0013] Base 1 comprises a back plate 11 with a hole 11a for communicating with a ventilation duct, two side bent pieces 12 that are bent from both sides of the back plate 11 toward the wall, an upper bent piece 13 that is bent sequentially from the top of the back plate 11 toward the wall, the top, and the cover 2 to form a wall contact portion 13a, and a drain piece 14 that is bent sequentially from the bottom of the back plate 11 toward the wall, the bottom, and the cover 2 to form a wall contact portion 14a.

[0014] The cover 2 comprises a front panel 21, two side bent pieces 22 that are bent from both sides of the front panel 21 toward the wall, and a top panel portion 23 that includes an upper bent piece 23a that is bent from the top of the front panel 21 toward the wall.

[0015] Furthermore, the outer surfaces of the two side bent pieces 12 and the upper bent piece 13 of the base 1 and the inner surfaces of the two side bent pieces 22 and the upper plate portion 23 of the cover 2 are in surface contact with each other when the cover 2 is attached to the base 1. Here, a waterproof tape 13d made of foamed EPDM or the like is attached to the outer surface (top surface) of the upper bent piece 13 of the base 1 to prevent rainwater from entering the exhaust hood through the gap between the outer surface of the upper bent piece 13 of the base 1, which is in surface contact with the inner surface of the top plate portion 23 of the cover 2.

[0016] A cylindrical member 3, which is inserted into the ventilation duct, is attached integrally to the back plate 11 of the base 1 at the location of the hole that connects to the ventilation duct, by welding the flange portion 31 of the cylindrical member 3 to the wall-side surface of the back plate 11 of the base 1. The cylindrical member 3 can be manufactured by press-forming a stainless steel sheet material such as SUS304 with a thickness of approximately 0.5 mm. The cylindrical member 3 is provided with springy temporary holding pieces 32, which are formed at 120° intervals, so that the exhaust hood can be temporarily fixed to the ventilation duct by inserting it into the ventilation duct. The cylindrical member 3 is provided with a waterproof seal 33 made of foamed urethane or the like, which is attached in an annular shape to receive the end face of the ventilation duct. Here, the portion of the cylindrical member 3 on which the waterproof seal 33 is installed is set back by several millimeters to about 10 mm (about 6 mm in this embodiment) from the wall-contact portion 13a and wall-contact portion 14a of the base 1 (a position away from the wall surface). Therefore, it can be accommodated without cutting off the portion of the ventilation duct that protrudes from the wall surface.

[0017] As a fixing structure for the cover 2 to the base 1, the upper fixing part is configured by inserting an upper locking piece 24a formed on the cover 2 (in this embodiment, it is formed by bending the edge of the cover top plate 23c) into a locking hole 13b formed on the upper bent piece 13 of the base 1, which has a spring-like retaining piece 13c formed by bending the upper bent piece 13. The lower fixing part is configured by fixing a lower locking piece 24b, which extends from the side bent piece 22 of the cover 2, to the draining piece 14 of the base 1 using a screw 14b. When forming a locking hole 13b with a retaining piece 13c in the upper bent piece 13, the area around the retaining piece 13c is punched out, and then the retaining piece 13c is bent. The upper fixing part works by inserting the upper locking piece 24a formed in the cover 2 into the locking hole 13b, causing the spring-loaded retaining piece 13c to contact the hole formed in the upper locking piece 24a, thereby providing both a retaining effect and a biasing effect that directs the cover 2 toward the wall. This ensures that the cover 2 and the wall are aligned This makes it possible to prevent gaps from forming between them. The lower fixing part prevents the screw 14b from coming loose by crushing the threads at the tip of the screw 14b that fastens the lower locking piece 24b formed on the cover 2 to the drain piece 14 of the base 1.

[0018] The folding position of the back plate 11 of the base 1, from the bottom towards the wall, is shifted so that the central part is lower than the sides, and a drain hole 11b is formed at the boundary of the folding position. This allows rainwater flowing between the back plate 11 of base 1 and the wall surface to be introduced into the exhaust hood through the drain hole 11b and discharged from the opening at the bottom of cover 2.

[0019] On both sides of the width direction of the drain piece 14 of the base 1, rectifier pieces 14c are formed. This allows the air (and rainwater) expelled from the exhaust hood to flow away from the wall.

[0020] The top panel portion 23 of the cover 2 consists of an upper bent piece 23a bent from the top of the front panel 21 toward the wall, two side bent pieces 22 bent from both sides of the front panel 21 toward the wall, with the upper parts of these side bent pieces 23b bent inward, a cover top plate 23c supported by the upper bent piece 23a and the side upper bent pieces 23b and attached integrally by spot welding, a butyl rubber vibration damping material 23d attached to the lower surface of the cover top plate 23c, and a rain noise prevention top plate 23e made of a stainless steel plate such as SUS304 with a thickness of about 2.0 mm and attached integrally by spot welding to the upper surface of the cover top plate 23c.

[0021] A flow-straightening piece 22a is formed on the lower wall side of the outer surface of the side bent piece 22 of the cover 2, so that rainwater flowing along the outer surface of the side bent piece 22 of the cover 2 flows away from the wall. This causes rainwater running along the outer surface of the side bent piece 22 of the cover 2 to fall away from the wall, preventing the falling rainwater from splashing onto the wall.

[0022] The louver 4 has a rigid tray shape with its peripheral edge 41 raised, and includes a plurality of slit-shaped air circulation holes 42a, 42b, 42c, and 42d that extend parallel to the wall surface, and a plurality of flow straightening pieces 43a, 43b, and 43c that extend along the edges of the air circulation holes 42a, 42b, and 42c on the side opposite the wall surface, and are provided at an angle so that the air discharged from the air circulation holes 42a, 42b, 42c, and 42d flows away from the wall surface, with the upper end facing the wall surface and the lower end facing the opposite wall surface. The louvers 4 can be manufactured by press-forming a stainless steel plate material such as SUS304 with a thickness of about 0.5 mm. Specifically, the air circulation holes 42a, 42b, and 42c are formed by punching out the four sides of the rectifier pieces 43a, 43b, and 43c, excluding the support parts 44 at both ends of the rectifier pieces 43a, 43b, and 43c. The rectifier pieces 43a, 43b, and 43c are then bent at the support parts 44 at both ends to achieve a predetermined inclination angle θ1 (in this embodiment, θ1: 39°).

[0023] Of the multiple air circulation holes 42a, 42b, and 42c, the slit width Wa (approximately 10 mm in this embodiment) of the air circulation hole 42a on the wall side, which is not affected by the flow straightening piece that causes air to flow away from the wall, is made smaller than the slit widths Wb and Wc (approximately 16 mm and 12 mm in this embodiment) of the other air circulation holes 42b and 42c, thereby reducing the airflow rate.

[0024] The louvers 4 are positioned such that the wall side of the louvers 4 rests on the stepped portion 14d formed on the drain piece 14 of the base 1, and the opposite wall side is positioned such that the lower edge of the front plate 21 of the cover 2 is bent. The mounting piece 21a is formed, and the mounting piece 45, which is left to protrude at an intermediate position in the air circulation hole 42d, is attached to it using a screw 21b. Here, the mounting piece 21a is subjected to burring and then tapped to form an internal thread. Since the mounting piece 21a is formed by bending the lower edge of the front panel 21 of the cover 2, there is no risk of it coming off. Louver 4 is installed with a slight incline (angle of incline: approximately 6°) so that the wall side of Louver 4 is slightly higher than the opposite wall side. This allows rainwater adhering to Louver 4 to flow from the wall side to the opposite wall side. Furthermore, this ensures that the rectifying pieces 43a, 43b, and 43c of the louver 4 are inclined at a predetermined angle θ2 (in this embodiment, θ2: 45°) with respect to the wall surface.

[0025] In this way, by manufacturing the louvers 4 by press molding, it is possible to easily and accurately manufacture louvers 4 that cause the air discharged from the exhaust hood to flow away from the wall surface. Furthermore, by making the slit width Wa of the air circulation hole 42a on the wall side of the multiple air circulation holes 42a, 42b, and 42c smaller than the slit widths Wb and Wc of the other air circulation holes 42b, the air discharged from the air circulation hole 42a is directed toward the water drain piece 14. In addition, by forming the air circulation hole 42d on the opposite side of the wall (front plate 21 side) from the rectifier piece 43c on the opposite side of the wall (front plate 21 side) of the louver 4, it is possible to prevent the air flowing along the front plate 21 of the cover 2 from stagnating and to ensure that the air discharged from the exhaust hood flows smoothly away from the wall.

[0026] Next, we will explain how to attach this exhaust hood to the opening end of the ventilation duct. First, the cylindrical member 3 of base 1 is inserted into the ventilation duct to temporarily fix the exhaust hood to the ventilation duct. Next, the temporarily fixed base 1 is secured to the wall by screwing the mounting screws 5 into the wall surface through the screw holes 51 formed in the wall surface contact portions 13a and 14a of the base 1 (in this embodiment, the screw holes 51 and 52 are formed in an elongated shape to allow for flexibility in the mounting position of the mounting screws 5), thereby fixing the wall surface contact portions 13a and 14a of the base 1 in close contact with the wall surface. Then, the cover 2 is attached to the base 1, which is fixed to the wall, via the upper and lower fixing parts. Finally, the louver 4 is placed with its wall side on the stepped portion 14d formed on the drain piece 14 of the base 1, and the opposite wall side is attached to the mounting piece 21a formed by bending the lower edge of the front plate 21 of the cover 2 using screws 21b, with the mounting piece 45 remaining to protrude at an intermediate position in the air circulation hole 42d.

[0027] This exhaust hood allows for stable and secure attachment of the base 1 to the wall surface by ensuring close contact between the wall-contacting portion 13a and the wall-contacting portion 14a, without having to cut off any portion of the ventilation duct that protrudes from the wall surface when attaching the exhaust hood to the opening end of the ventilation duct. Furthermore, the assembly of the exhaust hood, including the attachment of the cover 2 to the base 1 fixed to the wall and the attachment of the louvers 4, can be easily carried out.

[0028] The exhaust hood of the present invention has been described above based on its embodiments. However, the present invention is not limited to the configuration described above, and its configuration can be modified as appropriate without departing from the spirit of the invention. [Industrial applicability]

[0029] The exhaust hood of the present invention is designed to be attached to the open end of a ventilation duct. Because the base can be securely fixed to the wall without having to cut off any parts that protrude from the wall, it can be widely used as an exhaust hood attached to the opening end of a ventilation duct that opens into a wall. [Explanation of Symbols]

[0030] 1 Base 11 Back plate 11a hole 11b Drain hole 12 Side folded pieces 13 Upper folding piece 13a Wall ground area 13b Locking hole 13c retaining piece 13D Waterproof Tape 14 drained pieces 14a Wall contact area 14b screw 14c rectifier piece 14d Stepped section 2 Covers 21 Front plate 21a Mounting piece 21b screw 22 Side folded piece 22a Rectifier piece 23 Top plate section 23a Upper folding piece 23b Lateral upper bent piece 23c Cover Top 23d damping material 23e Rain noise prevention top plate 24a Upper locking piece 24b Lower locking piece 3. Cylindrical member 31 Flange section 32 Temporary holding piece 33 Waterproof seal 4. Louvers 41 Periphery 42a, 42b, 42c, 42d Air circulation holes 43a, 43b, 43c rectifier piece 44 Support part 45 Mounted piece 5 Mounting screws 51, 52 Screw holes

Claims

1. An exhaust hood that is attached to the opening end of a ventilation duct that opens facing a wall, A base having a hole formed therein for communication with the aforementioned ventilation duct, The base is provided with a box-shaped cover that covers the base except for the lower part, The aforementioned base is A back plate having a hole formed therein for communication with the aforementioned ventilation duct, Two side bent pieces are bent from both sides of the back panel toward the wall surface, An upper bent piece is formed by folding it in order from the top of the back plate towards the wall, then the upper side and then the cover side to form a wall-contact portion, A draining piece is formed by sequentially bending the lower part of the back plate so as to protrude diagonally downward toward the wall, the bottom, and the cover, thereby forming a wall-contact portion. Equipped with, The aforementioned cover is Front panel and Two side bent pieces are bent from both sides of the front panel toward the wall surface, The upper panel portion includes an upper bent piece that is bent from the upper part of the front panel toward the wall surface, Equipped with, The outer surfaces of the two side folded pieces and the upper folded piece of the base and the inner surfaces of the two side folded pieces and the upper plate portion of the cover are in surface contact with each other when the cover is mounted on the base. The folding position of the base, from the lower part of the back plate toward the wall, is shifted so that the central part is lower than the side parts, and a drain hole is formed at the boundary of the folding position. An exhaust hood characterized by the following features.

2. The upper fixing portion is configured such that the upper locking piece formed in the cover is inserted into a locking hole formed in the upper bent piece of the base, which has a spring-like retaining piece formed by bending the upper bent piece. The lower fixing portion is constructed by screwing the lower locking piece formed on the cover to the drain piece of the base. The exhaust hood according to feature 1.

Images