JP4850650B2 - Duct parts - Google Patents

Description

  The present invention relates to a duct component that can suppress the cost of a sound absorbing material and has an excellent sound insulation effect.

Non-flammable or flame-retardant thin layer 4 as a cylindrical outer cylinder, duct tube 2 as a cylindrical inner cylinder provided inside flame-retardant thin layer 4, inner surface and outer surface of duct tube 2 Between the plurality of through holes 2a penetrating through the inner surface of the nonflammable or flame retardant thin layer 4, the outer surface of the duct tube 2, the inner surface of the nonflammable or flame retardant thin layer 4, and the outer surface of the duct tube 2. An air duct 1 is known as a duct component in which an inorganic silicate foam layer 3 is provided inside a sound absorbing material storage portion formed by a space.
JP-A-6-331208

  However, the air duct 1 described above has a problem that the tubular inorganic silicate foam layer 3 must be formed using a dedicated machine, and the manufacturing cost of the inorganic silicate foam layer 3 is high. It was.

The duct component according to the present invention includes a first cylinder, a second cylinder provided inside the first cylinder, a plurality of holes penetrating the inner surface and the outer surface of the second cylinder, and the first cylinder. And the second cylinder, the front and rear lids that close the space between the first cylinder, and the second cylinder, and the space surrounded by the first cylinder, the second cylinder, and the front and rear lids. A part of the exhaust duct is formed by being connected to the midway part of the exhaust duct that connects the range hood in the house and the outside of the house, with a sound absorbing material storage part and a sound absorbing material stored in the sound absorbing material storage part In the duct part for relay , the first cylindrical body is formed by a horizontally long and flat cylinder having upper and lower flat wall portions and left and right side wall portions. The inner surface of the flat wall portion on one cylinder is connected to each other, and the lower end of the outer surface of the cylinder of the second cylinder and the inner surface of the flat wall portion below the first cylinder are connected to each other The sound absorbing material is provided with a sound absorbing material storage section delimited by the connecting portions on the left and right sides of the second cylindrical body with the upper and lower connecting portions as a boundary, and the sound absorbing material is formed of a sheet-like sound absorbing material provided with open cells, sheet of acoustic material, characterized in that the surface is accommodated in the stacked state in the intake sound material housing portion so as to extend along the inner surface of the sound absorbing material accommodating portion.
An outer cylinder formed by a horizontally long flat cylinder having a top and bottom flat wall portion and left and right side wall portions; a second cylinder is provided inside the outer cylinder; The front end as one end in the direction along the central axis, the front end as one end in the direction along the central axis of the cylinder of the second cylinder, and the rear end of the outer cylinder and the rear end of the second cylinder are aligned with each other. In this state, the front end of the second cylindrical body and the front end of the outer cylindrical body are connected by a front lid, and the front end of the outer cylindrical body and the front end of the second cylindrical body are closed in a sealed state. The rear end of the two cylinders and the rear end of the outer cylinder are connected by a rear lid, and the rear end of the outer cylinder and the rear end of the second cylinder are closed in a sealed state, and the first cylinder Is provided outside the rear end portion of the second cylindrical body, and an air layer is formed by a space surrounded by the front lid, the rear lid, the outer cylindrical body, the second cylindrical body, and the first cylindrical body. At the front end of the cylinder, the second cylinder A plurality of holes through which the inner of the inner and the air layer is provided with a front perforated tubular portion of the formed structure also features.
It is also characterized in that a plurality of sheet-like sound absorbing materials are stacked and stored in a stacked state.
It is also characterized in that the space between the end faces of the sheet-like sound absorbing materials facing each other is not continuous between the first cylinder and the second cylinder.
The sheet-like sound absorbing material is folded and stored in a laminated state .

According to the present invention, since the sound absorbing material stored in the sound absorbing material storage portion is formed of a sheet-like sound absorbing material, it is not necessary to form a sound absorbing material that matches the shape of the sound absorbing material storage portion, and the sound absorbing material storage portion The cost of the sound-absorbing material stored in the container can be reduced. Further, since the sound absorbing material includes open cells, and the sound absorbing material is installed so that the surface is along the inner surface of the sound absorbing material storage portion and is stored in a stacked state in the sound absorbing material storage portion, the first cylinder and the second tube since a state of sheet of acoustic material is laminated between the body, sound, or collide with the sound absorbing material, so attenuated by passing through the open cells of the sound absorbing material, excellent duct sound insulation Parts can be obtained. That is, the cost of the sound absorbing material can be reduced, and a duct component having an excellent sound insulation effect can be obtained . Since intake sound material is formed into a sheet, easily bent intake sound material, the work to be stored in a stacked state to the installed sound absorbing material housing portion along the surface of the intake sound material on the inner surface of the sound absorbing material housing portion It becomes easy. Moreover, by reducing the thickness of the plate of the intake sound material, it is possible to increase the number of folded several or sound absorbing material of the sound absorbing material to be laminated on the sound absorbing material housing portion, the number of collisions sound with respect to the surface of the intake sound material Can increase the sound attenuation effect.
In addition, an outer cylinder formed by a cylinder having a horizontally long cross section is provided, the second cylinder is provided inside the outer cylinder, and an air layer is formed between the outer cylinder and the second cylinder, Since the second cylindrical body includes the front perforated cylindrical portion, sound enters the air layer and attenuates through the plurality of holes of the front perforated cylindrical portion.
Since a plurality of sheet-like sound absorbing materials are stacked and stored in a stacked state, it is not necessary to form a sound absorbing material that matches the shape of the sound absorbing material storing portion, and the cost of the sound absorbing material stored in the sound absorbing material storing portion is reduced. be able to.
In addition, the space between the end surfaces of the sheet-like sound absorbing material facing each other is configured not to be continuous between the first cylinder and the second cylinder, and the sound always passes through the sound absorbing material. As a result, the sound attenuation effect can be increased.
Since the sheet-like sound absorbing material is folded and stored in a stacked state, it is not necessary to form a sound absorbing material that matches the shape of the sound absorbing material storage part, and the cost of the sound absorbing material stored in the sound absorbing material storage part is reduced. Can do.

Best form 1
1 to 4 show the best mode 1 of a duct part according to the present invention, FIG. 1 shows a sound absorbing component of the duct part of FIG. 2 in a vertical section, and FIG. 2 (a) shows the duct part. 2 (b) shows the duct part as viewed from the front side, FIG. 3 shows the duct part of FIG. 2 (a) in a cross section along the front, rear, left and right, and FIG. 4 shows an installation example of the duct part.
In this specification, the directions of “front”, “rear”, “left”, “right”, “upper”, and “lower” are the front side indicated by an arrow A with the duct component placed in the state of FIG. This is the direction specified when viewed from above.

FIG. 2; The duct part 1 is demonstrated with reference to FIG.
The duct component 1 includes an inner cylindrical body 2, an outer cylindrical body 3, a closing body 4, a connecting portion 5, and a sound absorbing component 20. The inner cylindrical body 2, the outer cylindrical body 3, the closing body 4, the connecting portion 5, and the sound absorbing material storage portion 21 of the sound absorbing constituent portion 20 are formed of, for example, a metal plate having a thickness of about 0.5 mm to 1.6 mm.

  The inner cylinder 2 as the second cylinder has a front end as one end in the direction along the center axis of the cylinder and a rear end as the other end in the direction along the center axis of the cylinder, that is, both the front and rear ends of the cylinder It is formed by a cylinder with an open circular cross section.

  The outer cylinder 3 is formed of a cylinder having a horizontally long cross-section that is flat in the left-right direction as a first orthogonal direction that is open at both front and rear ends of the cylinder and orthogonal to the direction along the center axis of the cylinder. That is, the outer cylinder 3 is formed by the upper and lower flat wall portions 6; 7 and the left and right side wall portions 8; 9. The upper and lower flat wall portions 6; 7 extend along the front-rear direction and the left-right direction of the cylinder, and the upper and lower flat walls 6; It is formed by flat plates facing each other in parallel in the direction. The left and right side wall portions 8; 9 are formed by long plates that are long before and after the semicircular arc shape of a cross-section of a circular cylinder with a perfect cross-section cut along the central axis of the cylinder. The left end portions of the upper and lower flat wall portions 6; 7 are connected to each other by the left side wall portion 8, and the right end portions of the upper and lower flat wall portions 6; 7 are connected to each other by the right side wall portion 9. A cylindrical body 3 is formed.

  The outer cylindrical body 3 is formed such that the length in the left-right direction of the cylinder (hereinafter referred to as the left-right length) W is longer than the length H in the vertical direction of the cylinder (hereinafter referred to as the vertical length) H. The left and right length W is the length between the left and right end outer surfaces of the outer cylinder 3, and the upper and lower length H is the length of the shortest portion between the upper and lower end outer surfaces of the outer cylinder 3. That is, the outer cylindrical body 3 is formed such that the length in the first orthogonal direction orthogonal to the central axis of the cylinder is longer than the length in the second orthogonal direction orthogonal to the central axis of the cylinder and the first orthogonal direction. The front and rear lengths of the outer cylindrical body 3 and the front and rear lengths of the inner cylindrical body 2 are the same.

  The inner cylinder 2 is provided inside the outer cylinder 3 so that the center axis of the cylinder of the inner cylinder 2 and the center axis of the cylinder of the outer cylinder 3 are the same (that is, the inner cylinder 2 and the outer cylinder 3 The cylindrical body 3 is coaxial with each other), and the front end of the outer cylindrical body 3 and the front end of the inner cylindrical body 2 and the rear end of the outer cylindrical body 3 and the rear end of the inner cylindrical body 2 are aligned with each other, The front end of the inner cylinder 2 and the front end of the outer cylinder 3 are connected by a front lid 12 as a lid body 4 so that the front end of the outer cylinder 3 and the front end of the inner cylinder 2 are closed in a sealed state. In addition, the rear end of the inner cylinder 2 and the rear end of the outer cylinder 3 are connected by a rear lid 13 as a lid body 4, and between the rear end of the outer cylinder 3 and the rear end of the inner cylinder 2. Is closed in a sealed state. An air layer 11 is formed by a space surrounded by the lid body 4, the outer cylinder body 3, the inner cylinder body 2, and the sound absorbing component 20.

The inner cylinder 2 includes a front perforated cylindrical portion 15 at the front end of the cylinder, a rear perforated cylindrical portion 16 at the rear end of the cylinder, and the front perforated cylindrical portion 15 and the rear perforated cylindrical portion 16. Is formed in the non-perforated cylindrical portion 17.
The front perforated tube portion 15 and the rear perforated tube portion 16 are configured such that a plurality of holes 18 penetrating the inner surface of the inner cylindrical body 2 and the outer surface of the tube are formed. For example, the front perforated cylinder part 15 and the rear perforated cylinder part 16 of the inner cylinder 2 are formed by a punching iron plate.

The sound absorbing component 20 is provided on the outer periphery of the rear perforated cylindrical portion 16 of the inner cylindrical body 2.
The sound absorbing component 20 includes a sound absorbing material storage 21 and a sound absorbing material 22 stored in the sound absorbing material storage 21.
The sound absorbing material storage unit 21 includes an outer cylinder 23 as a first cylinder, an inner cylinder 2 as a second cylinder provided inside the outer cylinder 23, and a front end of the outer cylinder 23. The front closing plate 25 as a cover plate before connecting the outer cylinder and the outer surface of the cylinder of the inner cylinder 2, and the rear end of the outer cylinder 23 and the outer surface of the rear end of the inner cylinder 2 are blocked. And a space surrounded by the front and rear cover plates formed by the outer cylinder 23, the inner cylinder 2, the front closing plate 25, and the rear lid 13. It is formed by. The side of the space adjacent to the air layer 11 is blocked from the air layer 11 by the outer cylinder 23 and the front closing plate 25.

The outer cylinder 23 is open at both the front and rear ends of the cylinder and is flat in the horizontal direction as the first orthogonal direction perpendicular to the direction along the center axis of the cylinder, like the outer cylinder 3. It is formed by a flat cylinder. That is, the outer cylinder 23 is formed by upper and lower flat wall portions 23a; 23b and left and right side wall portions 24a; 24b. The upper and lower flat wall portions 23a; 23b extend along the front-rear direction and the left-right direction of the cylinder, and the upper and lower flat wall portions 23a; It is formed by flat plates facing each other in parallel in the direction. The left and right side wall portions 24a and 24b are formed by long plates that are long before and after a semicircular arc shape obtained by cutting a circular cylinder having a circular cross section along the central axis of the cylinder. The left end portions of the upper and lower flat wall portions 23a; 23b are connected to each other by the left side wall portion 24a, and the right end portions of the upper and lower flat wall portions 23a; 23b are connected to each other by the right side wall portion 24b. A surrounding cylinder 23 is formed.
As with the outer cylinder 3, the outer cylinder 23 is formed of a cylinder having a horizontally long cross-section that is flat in the left-right direction.

The outer cylinder 23 is provided outside the inner cylinder 2 so that the central axis of the cylinder of the inner cylinder 2 and the central axis of the cylinder of the outer cylinder 23 are the same (that is, the inner cylinder). 2 and the outer cylinder 23 are arranged coaxially with each other, and the upper end of the outer surface of the cylinder of the inner cylinder 2 and the center between the left and right of the inner surface of the flat wall portion 23a on the outer cylinder 23 are the cylinder. Connected to each other from the front end to the rear end, the lower end of the outer surface of the cylinder of the inner cylinder 2 and the center between the left and right of the inner surface of the flat wall portion 23b below the outer cylinder 23 extend from the front end to the rear end of the cylinder. Connected to each other.

The upper and lower connecting portions 10; 10 that connect the inner cylinder 2 and the outer cylinder 23 are formed at positions 180 degrees apart from each other on the outer peripheral surface of the inner cylinder 2 (see FIG. 1). Sound absorbing components 20; 20 delimited by the connecting portions 10; 10 are formed on the left and right sides of the inner cylinder 2 with the upper and lower connecting portions 10;
The outer surface (upper and lower ends of the cylinder) of the outer cylindrical body 23 corresponding to the connecting portion 10; 10 and the inner surface of the outer cylindrical body 3 are connected to each other.
The above-mentioned connection means a state in which the surfaces are in contact with each other but are not coupled, or a state in which the surfaces are coupled to each other by an adhesive or engagement coupling.

With reference to FIG. 1, the structure of the sound absorption structure part 20 is demonstrated.
The sound absorbing component 20 is formed by storing, for example, a plurality of sound absorbing material pieces 25 as the sound absorbing material 22 in the sound absorbing material storage 21 (that is, the space of the sound absorbing material storage 21).
The sound-absorbing material piece 25 is formed in a sheet shape having a thickness (the length in the left-right direction of the paper surface of the sound-absorbing material piece 25 in FIG. 1), for example, and the length of the sheet (the paper surface of the sound-absorbing material piece 25 in FIG. 1). Is formed in a length corresponding to the length in the direction along the central axis of the cylinder of the sound absorbing material storage portion 21, and the width of the sheet (up and down of the surface of the sound absorbing material piece 25 in FIG. 1) The length in the direction) is shorter than 1/2 of the inner peripheral length of the outer cylinder 23.

  For example, the first sound-absorbing material piece 25a formed so that the width of the flat plate corresponds to ½ the inner peripheral length of the outer cylinder 23 in the sound-absorbing material storage portion 21, and the width of the flat plate is the first sound-absorbing material The second to sixth sound absorbing material small pieces 25b to 25f formed to be about ½ of the flat plate width of the small piece 25a are used.

The sound absorbing material piece 25 is formed by cutting a sound absorbing material sheet (not shown) into a desired size.
The sound-absorbing material sheet is formed by, for example, squeezing a glass fiber called E-glass, which is hardened into a sheet shape, with a needle punch, so that the entanglement between the glass fibers is loosened, and the space between the glass fibers is reduced. It penetrates through both sides of the sound-absorbing material sheet continuously in a stepped manner in the thickness direction of the sheet (that is, straddling one surface forming the surface of the sound-absorbing material sheet and the other surface forming the back surface of the sound-absorbing material sheet) A continuous bubble is formed.

The sound absorbing component 20 is installed in the sound absorbing material storage portion 21 having a crescent-shaped cross section along the inner peripheral surface of the outer cylindrical body 23 in the surface of the first sound absorbing material piece 25a. The second sound-absorbing material pieces 25b; 25b are separately installed on the upper and lower sides along the inner surface, and the third sound-absorbing material piece 25c is provided along the inner surface of the second sound-absorbing material pieces 25b; 25b. The fourth sound absorbing material piece 25d is installed in a state of being biased downward along the inner surface of 25c, and the fifth sound absorbing material piece 25e is installed in a state of being biased upward along the inner surface of this fourth sound absorbing material piece 25d. The sixth sound absorbing material piece 25f is disposed along the inner surface of the fifth sound absorbing material piece 25e. That is, the first sound absorbing material piece 25a to the sixth sound absorbing material piece 25f (hereinafter, these may be collectively referred to as the sound absorbing material piece 25) are curved, and the curved surface is formed on the inner surface of the sound absorbing material storage portion 21. The sound absorbing material storage unit 21 is installed so as to be stacked and stored in a stacked state.
The inner surfaces of the first sound absorbing material piece 25a to the fifth sound absorbing material piece 25e are the cylinders of the inner cylinder 2 in the first sound absorbing material piece 25a to the fifth sound absorbing material piece 25e. The curved surface on the side close to the center a.

That is, since the sound absorbing material 22 housed in the sound absorbing material housing portion 21 is formed by a plurality of sound absorbing material pieces 25 formed in a sheet shape, the sound absorbing material 22 that matches the shape of the sound absorbing material housing portion 21 is manufactured. Since the manufacture is easier than in the case, the cost of the sound absorbing material stored in the sound absorbing material storage portion 21 can be reduced. Further, the sound absorbing material piece 25 includes open cells, and the plurality of sound absorbing material pieces 25 are installed in the sound absorbing material storage portion 21 so that the surfaces of the plurality of sound absorbing material pieces 25 are along the inner surface of the sound absorbing material storage portion 21. Since they are stored in a stacked state, a plurality of sound absorbing material pieces 25 are stacked between the inner cylindrical body 2 and the surrounding cylindrical body 23, so that the sound is stacked in a plurality of sound absorbing material pieces 25. A duct having an excellent sound insulation effect because it attenuates by colliding with the sound absorbing material when passing through the gap formed by the continuous bubbles and also attenuates by colliding with the surface of the plurality of stacked sound absorbing material pieces 25 Part 1 can be obtained. That is, the cost of the sound absorbing material 22 can be reduced, and the duct component 1 having an excellent sound insulation effect can be obtained.

In addition, since the sound absorbing material piece 25 formed in a thin sheet shape having a thickness of about 5 mm is used, for example, the sound absorbing material piece 25 can be easily bent, and the sheet-like surfaces of the plurality of sound absorbing material pieces 25 are disposed on the sound absorbing material storage portion 21. Thus, it is easy to install the sound absorbing material in the laminated state in the sound absorbing material storage portion 21. Moreover, by reducing the thickness of the flat plate of the sound absorbing material pieces 25, it is possible to increase the number of sound absorbing material pieces 25 laminated on the sound absorbing material accommodating portion 21, much the collision frequency of the sound with respect to the surface of the sound absorbing material pieces 25 Thus, since the sound attenuation effect can be increased, the duct component 1 having an excellent sound insulation effect can be obtained.

The sound absorbing component 20 includes a first sound absorbing material piece 25 a, a second sound absorbing material piece 25 b, a third sound absorbing material piece 25 c, and a sixth sound absorbing material piece 25 f in the sound absorbing material storage portion 21. Are arranged symmetrically with respect to the upper and lower center line c, and the fourth sound-absorbing material piece 25d is installed in a state of being biased upward, and the fifth sound-absorbing material piece 25e is placed in a state of being biased downward. It is formed.
That is, the third sound-absorbing material piece 25c to the sixth sound-absorbing material piece 25f are laminated in a state where at least a part of the adjacent sound-absorbing material pieces overlaps each other, as in the second sound-absorbing material pieces 25b; 25b. Even if the end surfaces 25s; 25s are opposed to each other so that a space 26 is formed between the end surfaces 25s and 25s, such a space 26 is formed between the inner cylinder 2 and the outer cylinder 23. It was set as the structure which was not continuous between. That is, when the space 26 is configured to be continuous between the inner cylindrical body 2 and the outer cylindrical body 23, sound passes through the continuous space between the inner cylindrical body 2 and the outer cylindrical body 23. Therefore, the sound absorbing effect is low because the plurality of sound absorbing material pieces 25 are not passed. Therefore, in the best mode 1, since the space 26 is not continuous between the first cylinder and the second cylinder, the sound always passes through the plurality of sound absorbing material pieces 25. The damping effect can be increased and the duct component 1 having an excellent sound insulation effect can be obtained.

Furthermore, the surfaces and end surfaces of the sound-absorbing material pieces 25 adjacent to each other are not bonded to each other by an adhesive. For this reason, the continuity of the open cells between the sound absorbing material pieces 25 adjacent to each other is not blocked by the adhesive, and the continuity of the open cells between the sound absorbing material pieces 25 is maintained. Thus, the duct component 1 having an excellent sound insulation effect can be obtained.

  The connecting part 5 includes a front connecting part 28 and a rear connecting part 29. The front side connecting part 28 and the rear side connecting part 29 are formed by a circular cylinder having a perfectly circular cross section in which both front and rear ends of the cylinder are open, and the diameter of the cylinder is the same as the diameter of the cylinder of the inner cylinder 2. . The front connecting portion 28 extends forward from the front end of the inner cylinder 2 by connecting the rear end of the cylinder and the front end of the cylinder of the inner cylinder 2 to each other. The rear connection portion 29 extends rearward from the rear end of the inner cylinder 2 by connecting the front end of the cylinder and the rear end of the inner cylinder 2 to each other.

  As shown in FIG. 4, the duct component 1 is connected to an intermediate position of the exhaust duct 33 that connects the range hood 32 provided with the air conditioning fan 31 and the outside of the apartment house 30 in the apartment house 30, whereby the exhaust duct 33. It can be made to function as a sound insulation duct for relay that forms a part of. That is, by providing the duct component 1 in a part of the exhaust duct 33, it is possible to form the exhaust duct 33 that can effectively attenuate both the low frequency component and the high frequency component of the sound. The exhaust duct 33 is formed by a plurality of unit duct parts 34 and the duct part 1. A unit duct part 34 as another duct part includes an inner cylinder 35 and an outer cylinder 36 that are coaxially arranged, and a heat insulating material 37 such as glass wool is provided between the inner cylinder 35 and the outer cylinder 36. It is the structure provided (refer FIG. 3). The inner cylinder body 35 and the outer cylinder body 36 are formed by a cylinder having a perfect circular cross section in which both front and rear ends of the cylinder are opened.

As the plurality of unit duct parts 34, a male unit duct part 41 having a connecting part similar to the connecting part 5 of the duct part 1 on both ends, and a female unit having a form having no connecting parts on both ends. A duct part 42 is used. When the exhaust duct 33 is configured by only a plurality of unit duct parts 34, the male unit duct part 41 is fitted by fitting the connecting portion of the male unit duct part 41 inside the inner cylinder 35 of the female unit duct part 42. And the female unit duct part 42 may be connected alternately, but in the best mode 1, the duct part 1 is connected instead of the single male unit duct part 41 positioned in the middle of the exhaust duct 33. To do. At this time, since the duct part 1 includes the connecting portion 5, the connection work with the female unit duct part 42 is facilitated, and the exhaust duct 33 can be easily disposed (see FIG. 2). That is, the duct part 1 is formed so that the outer diameter of the connecting part 5 fits the inner surface of the inner cylinder 35 of the female unit duct part 42, and the connecting part 5 is the end of the cylinder in the female unit duct part 42. Since it is formed so that it can be connected adjacent to the female unit duct part 42 by fitting into the inner surface of the inner cylindrical body 35 of the female unit duct part 42 from the side of the section, the pair with the female unit duct part 42 It is easy to attach, and the unity with the female unit duct part 42 can be improved.
Further, the duct component 1 is connected, for example, with the front end side positioned on the range hood 32 side and the rear end side positioned on the outside side of the apartment house 30.
In FIG. 4, 43 is a range stand, 44 is wall concrete, 45 is floor concrete, 46 is a floor, 47 is a ceiling, and 48 is a hanger for the exhaust duct 33.

The duct part 1 has, for example, a length of 500 mm before and after the outer cylinder 3 and the inner cylinder 2, a length of 60 mm before and after the connecting portion 5, a total length of 620 mm before and after the inner cylinder 2 and the connection The outer diameter of the portion 5 is 150 mm, the length between the inner surfaces of the upper and lower flat wall portions 6: 7 of the outer cylinder 3 (shortest distance dimension) is 150 mm, the left and right length W of the outer cylinder 3 is 360 mm or 500 mm, The front and rear lengths of the front perforated tube portion 15 are 100 mm, the front and rear lengths of the sound absorbing component 20 and the rear perforated tube portion 16 are 200 mm, and the length between the left end portion and the right end portion of the sound absorbing component portion 20 is The front and rear lengths of the non-perforated cylindrical portion 17 are 200 mm. The front perforated cylindrical portion 15 and the rear perforated cylindrical portion 16 are formed of, for example, a punching iron plate, and the aperture ratio of the plurality of holes 18 is 58%.
The male unit duct component 41 has, for example, a length of 1000 mm before and after the outer cylinder 36 and the inner cylinder 35, a length of 60 mm before and after the connecting portion, an outer diameter of the outer cylinder 36 of 250 mm, and an inner cylinder. The outer diameter of the body 35 and the connecting portion is 150 mm.
The female unit duct part 42 has, for example, a length of the outer cylinder 36 and the inner cylinder 35 of 1000 mm, an outer diameter of the outer cylinder 36 of 250 mm, and an inner diameter of both ends of the inner cylinder 35 of the duct part 1. The diameter of the connecting part 5 and the diameter of the connecting part of the male unit duct part 41 are larger by the plate thickness of the connecting part 5 of the duct part 1 and the connecting part of the male unit duct part 41.

The operation of the duct part 1 will be described with reference to FIGS.
When sound from outside the building enters the exhaust duct 33, or when sound generated by driving the air conditioning fan 31 enters the exhaust duct 33 from the range hood 32 side, the sound functions as a relay sound insulation duct. It enters the air layer 11 via the hole 18 of the front perforated cylindrical part 15 of the component 1 or enters the sound absorbing component 20 via the hole 18 of the rear perforated cylindrical part 16. That is, the sound travels between the inner side of the inner cylindrical body 2 and the inner side of the sound absorbing component 20 via the rear perforated cylindrical part 16 and the inner cylindrical body 2 via the front perforated cylindrical part 15. Go back and forth between the inside and the air layer 11. The sound that enters the air layer 11 collides with the air and the inner surface of the outer cylindrical body 3 and the outer surface of the inner cylindrical body 2 and attenuates.

Best form 2
As shown in FIG. 5, the sound absorbing material 22 accommodated in the sound absorbing material accommodating portion 21 is formed by the sheet-like sound absorbing material 22, that is, the sheet-like sound absorbing material 22 having open cells as described above, The material 22 is stored in a stacked state in the sound absorbing material storage portion 21 so that the surface of the sound absorbing material 22 is folded and the surface of the sound absorbing material 22 is along the inner surface of the sound absorbing material storage portion 21, and is folded and adjacent. The duct component 1 is configured such that the sound absorbing materials 22 are not bonded to each other by an adhesive.
In FIG. 5, the sound absorbing component 20 on the right side of the drawing is omitted from the illustration of the sound absorbing member 22 housed in the sound absorbing member storing portion 21, but the sound absorbing component 20 on the right side of the drawing is also on the left side of the drawing. In the same manner as the sound absorbing component 20, a sheet-like sound absorbing material 22 is housed and formed in the sound absorbing material housing 21. Further, the configuration other than the sound absorbing component 20 in the duct component 1 of the best mode 2 is the same as that of the best mode 1.

According to the best mode 2, for example, since the sound absorbing material 22 formed in a thin sheet shape having a thickness of about 5 mm is used, the sound absorbing material 22 is folded so that the surface of the sound absorbing material 22 is the sound absorbing material storage portion. The work of storing the sound absorbing material storage portion 21 in a stacked state along the inner surface of the sound absorbing member 21 becomes easy. Moreover, by reducing the thickness of the flat plate of the sound absorbing material 22, it is possible to increase the number of folded of the sound absorbing material 22, and can increase the collision frequency of the sound with respect to the surface of the sound absorbing material 22, to increase the damping effect of the sound Therefore, the duct part 1 having an excellent sound insulation effect can be obtained. Moreover, if the sound absorbing material 22 formed into a thin sheet is used, the sound absorbing material 22 can be easily manufactured, and the cost of the sound absorbing material 22 can be suppressed.

In the best mode 2, since the space 26 is not continuous between the first cylinder and the second cylinder, the sound always passes through the sound-absorbing material 22 that is folded, so that the sound is attenuated. An effect can be raised and the duct component 1 excellent in the sound-insulation effect can be obtained. Further, the surfaces and end surfaces of the sound absorbing material 22 adjacent to each other are not bonded to each other by an adhesive. For this reason, the continuity of the open cells between the sound absorbing materials 22 adjacent to each other is not blocked by the adhesive, and the continuity of the open cells between the sound absorbing materials 22 is maintained, so that the sound is attenuated by the open cells. The duct component 1 having an excellent sound insulation effect can be obtained without impairing the effect.

As the duct part 1 according to the best form 1, the duct part 1 according to the best form 2, and the duct part as a comparative example, those having the left and right length W of the outer cylinder 3 of 500 mm are prepared. An experiment was conducted to measure the sound pressure level attenuation (dB) when 1 was used. Although not shown, the duct part as a comparative example has a crescent cross section in the crescent cross section of the sound absorbing material storage section 21 in FIGS. 1 and 5 and a length in a direction perpendicular to the paper surface in FIGS. 1 and 5. The two sound-absorbing materials having a length corresponding to the length in the direction along the central axis of the cylinder of the outer cylinder 23 are laminated to form a crescent-shaped inner arc surface of one sound-absorbing material and the other. This is a duct component including a sound absorbing component formed by housing a sound absorbing material that is bonded to an outer arc surface of the sound absorbing material with an adhesive.
The experiment was conducted with the experimental apparatus shown in FIG. That is, the front connecting portion 28 (see FIG. 2A) of the duct component 1 as a test body and the rear end portion of the front cylindrical tube 61 having an inner diameter of 150 mm are connected to each other, and the rear connecting portion 29 ( 2A) and the front end portion of the rear cylindrical tube 62 having an inner diameter of 150 mm are connected to each other, and one end of a sound tube 63 that takes in sound is connected to the front portion of the front cylindrical tube 61, and the other end of the sound tube 63 is connected. The sound source speaker 64 is arranged, and the noise generated by the noise generator 65 is amplified and input to the sound source speaker 64 by the amplifier 66a. A non-reflection end 66 is formed at the front end of the front cylindrical tube 61, and a non-reflection end 67 is formed at the rear end of the rear cylindrical tube 62. The non-reflective end 66 has two glass wools with a density of 96 kg / m ³ and a thickness of 50 mm, not shown, and a density of 48 kg / m from the front end of the cylinder toward the side where the duct part 1 is located inside the front cylindrical tube 61. ³ and 2 glass wool with a thickness of 50 mm and 2 glass wool with a density of 24 kg / m ³ and a thickness of 50 mm were laminated in that order. The non-reflective end 67 was formed in the same manner. The sound pressure level attenuation (dB) is measured by installing a microphone 68 inside the front cylindrical tube 61 that is a predetermined distance a forward from the front end of the duct part and a predetermined distance rearward from the rear end of the duct part 1. After being separated by b, a microphone 69 is installed inside the cylindrical tube 62, and the sound pressure levels of the sounds collected by the microphones 68; 69 are individually measured by sound level meters (with frequency analysis function) 70; The difference between the sound pressure level on the front side of the part 1 and the sound pressure level on the rear side of the duct part 1, that is, the sound pressure level attenuation amount was obtained. The predetermined distance a and the predetermined distance b are the same distance, and the predetermined distance a: b is directed from the duct part 1 toward the non-reflective end 66; 67 between the point x of 0 mm and the point y of 1000 mm at every 100 mm interval. The sound pressure level attenuation is measured at each of 11 corresponding pairs at the same distance from the duct part 1 before and after the duct part 1, and the average value of the attenuation at each of the 11 parts. Was taken as the measurement result. Numbers other than the reference numerals in FIG. 6 indicate dimensions, and the unit is mm.

FIG. 7 shows the measurement results of the sound pressure level attenuation when the duct parts 1 according to the best modes 1 and 2 and the comparative example are used. 7, (1) shows the measurement result of the duct part according to the best mode 1, (2) shows the measurement result of the duct part according to the best mode 2, and (3) shows the measurement result of the duct part as a comparative example.
As can be seen from FIG. 7, the duct part 1 of the best mode 1: 2 has a sound pressure level attenuation with respect to the sound of the component of 400 Hz or higher, which is a frequency plate of road noise and railway noise, compared to the duct part 1 according to the comparative example. The amount is excellent. Furthermore, the duct component 1 of the best mode 1 is excellent in sound pressure level attenuation with respect to sound having a component of 400 Hz or less. That is, it was confirmed that the duct component 1 of the best mode 1 can attenuate the sound of a wide range of frequency plates in a well-balanced manner and has an excellent sound insulation effect. In addition, it is confirmed that the duct component 1 of the best form 2 has an effect equivalent to that of the duct part 1 of the best form 1 with respect to a sound insulation effect for living environment noise of 400 Hz or higher such as road noise and railway noise. It was done.

Best form 3
The duct component 1 of the best mode 3 will be described with reference to FIG. FIG. 8A is a perspective view of the duct component 1, and FIG. 8B is a cross-sectional view of the duct component 1.
As shown in FIG. 8, in place of the inner cylinder 2 in the best mode 1; 2, the inner surface formed by a perforated cylinder in which a plurality of holes 18 are formed uniformly over the entire area of the cylinder wall of the cylinder. A duct part 1 having a configuration including a cylindrical body 2 was obtained.
That is, the outer cylinder 3 as the first cylinder, the inner cylinder 2 as the second cylinder provided inside the outer cylinder 3, and a plurality of holes penetrating through the inner surface and the outer surface of the inner cylinder 2 A sound absorbing material storage formed by the hole 18, the outer cylinder 3, the inner cylinder 2, the front and rear cover bodies 14, and the space surrounded by the outer cylinder body 3, the inner cylinder body 2, and the front and rear cover bodies 14. The duct component 1 may also be provided with a sound absorbing component 20 that is formed by storing the sound absorbing material 22 in a stacked state in the sound absorbing material storage portion 21. In this case, the sound absorbing material 22 is provided in the sound absorbing material storage portion 21 with the sound absorbing structure portion 20 configured as shown in FIGS. 1 and 5, thereby providing the duct component 1 having an excellent sound insulation effect. it can.
In other words, the sound absorbing component 20 in FIG. 2A is deleted, and the sound absorbing material storage portion 21 is formed by the outer cylinder 3, the inner cylinder 2 and the lid 4 in FIG. This is a duct component 1 including a sound absorbing component 20 having a configuration in which a sound absorbing material 22 is stored in a storage portion 21 as shown in FIGS. 1 and 5. In this case, since the volume of the sound absorbing component 20 is increased, the duct component 1 having an excellent sound attenuation effect can be obtained.

An outer cylinder 3 as a first cylinder formed by a cylinder with a perfect cross-sectional shape, and an inner cylinder formed by a cylinder with a perfect cross-section as a second cylinder provided inside the outer cylinder 3 A plurality of holes penetrating the inner surface and the outer surface of the inner cylindrical body 2, the outer cylindrical body 3, the inner cylindrical body 2, the lid body 4, the outer cylindrical body 3, the inner cylindrical body 2 and the lid body. And a sound-absorbing material storage part 21 formed by a space surrounded by 4, and a duct component 1 including a sound-absorbing component formed by storing the sound-absorbing material 22 in a laminated state in the sound-absorbing material storage part 21. But you can. For example, the sound absorbing material 22 includes the sound absorbing component 20 having a structure stored as shown in FIG. 1 or FIG. It is possible to provide duct parts with excellent effects.
In the case where the outer cylindrical body 3 as the first cylindrical body and the inner cylindrical body 2 as the second cylindrical body are both formed of a circular cylinder having a cross-sectional shape, the inner cylindrical body 2 is the center. It is good also as the duct component 1 provided with the sound absorption structure part 20 of the structure accommodated in the sound absorption material accommodating part 21 in the lamination | stacking state by winding the sheet-like sound absorption material 22 in the spiral shape. Even in the case of such a configuration, a duct component having an excellent sound insulation effect can be provided as in the best modes 1 and 2.

  As the sound absorbing material 22 used in the present application, glass wool, rock wool, non-woven fabric or the like having open cells may be used.

Sectional drawing of a sound absorption structure part (best form 1). The perspective view and front view of a duct component (the best form 1). Sectional view of duct parts (best mode 1) The figure which shows the example of installation of a duct component (best form 1). Sectional drawing (best form 2) of a sound absorption structure part. The figure which shows the experimental apparatus which measured the sound pressure level attenuation amount of the duct components (the best form 1; 2 and a comparative example). The graph which shows an experimental result (best form 1; 2 and a comparative example). The perspective view and sectional drawing of a duct component (best form 3).

Explanation of symbols

1 duct part, 2 inner cylinder (second cylinder), 3 outer cylinder (first cylinder),
4 cover body, 18 holes, 20 sound absorbing component, 21 sound absorbing material storage, 22 sound absorbing material,
25 (25a-25f) sound-absorbing material piece , the edge part of the flat plate of 25s sound-absorbing material piece .

Claims (5)

A first cylinder, a second cylinder provided inside the first cylinder, a plurality of holes penetrating the inner surface and the outer surface of the second cylinder, the first cylinder, the second cylinder, and the first cylinder A sound-absorbing material storage section formed by a front and rear lid that closes between the one cylindrical body and the second cylindrical body, and a space surrounded by the first cylindrical body, the second cylindrical body, and the front and rear lid bodies ; In a duct component for a relay comprising a sound absorbing material housed in a sound absorbing material housing portion and forming a part of the exhaust duct by being connected to a midway portion of the exhaust duct connecting the range hood in the house and the outside of the house ,
The first cylinder is formed by a horizontally long and flat cylinder having a top and bottom flat wall part and left and right side wall parts,
The upper end of the outer surface of the cylinder of the second cylinder and the inner surface of the flat wall part on the first cylinder are connected to each other, and the lower end of the outer surface of the cylinder of the second cylinder and the flat wall part below the first cylinder Are connected to each other, and on both the left and right sides of the second cylindrical body with the upper and lower connection portions as a boundary, provided with a sound absorbing material storage portion divided by the connection portions,
The sound absorbing material is formed by a sheet-like sound absorbing material with open cells,
Sheet of acoustic material, the duct part, wherein the surface is accommodated in the stacked state in the intake sound material housing portion so as to extend along the inner surface of the sound absorbing material accommodating portion.   An outer cylinder formed of a cylinder having a horizontally long cross-section having upper and lower flat wall portions and left and right side wall portions;
  The second cylinder is provided inside the outer cylinder, and the front end as one end in the direction along the center axis of the cylinder of the outer cylinder and the front end as one end in the direction along the center axis of the cylinder of the second cylinder In the state where the rear end of the outer cylinder and the rear end of the second cylinder coincide with each other, the front end of the second cylinder and the front end of the outer cylinder are connected by the front lid, and the front end of the outer cylinder The space between the front end of the second cylindrical body is closed in a sealed state, and the rear end of the second cylindrical body and the rear end of the outer cylindrical body are connected to each other by a rear lid, The space between the rear end of the cylinder is closed in a sealed state,
  The first cylinder is provided outside the rear end of the second cylinder;
  An air layer is formed by a space surrounded by the front lid, the rear lid, the outer cylindrical body, the second cylindrical body, and the first cylindrical body,
  The front end portion of the cylinder of the second cylinder is provided with a front perforated cylinder portion having a structure in which a plurality of holes are formed through the inside of the second cylinder and the inside of the air layer. Item 2. The duct part according to Item 1. The duct component according to claim 1 or 2, wherein a plurality of sheet-like sound absorbing materials are stacked and stored in a stacked state . The duct component according to claim 3 , wherein a space between the end surfaces of the sheet-like sound absorbing materials facing each other is not continuous between the first cylinder and the second cylinder. The duct component according to claim 1 or 2, wherein the sheet-like sound absorbing material is folded and stored in a laminated state .

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