Noise reducing device

Abstract

A noise reduction device is provided by one embodiment of the present invention. A noise reduction device according to one embodiment of the present invention may include: a housing having a fluid space formed inside and an inlet and an outlet formed at each end, respectively, communicating with the fluid space for fluid flow; at least one sound-absorbing panel arranged along the direction of fluid flow inside the fluid space, with each side end fixed to the inner surface of the housing to absorb noise entering through a sound-absorbing surface exposed to the fluid space; a plurality of nut members inserted at both side ends of the sound-absorbing panel in contact with the housing; a plurality of fastening holes penetrating the housing and communicating with the nut members; and a plurality of bolt members inserted from the outside of the housing, passing through the fastening holes and coupling with the nut members to fix the sound-absorbing panel to the housing.

Description

Technology Field

[0001] The present invention relates to a noise reduction device, and more specifically, to a noise reduction device that facilitates the installation of a sound-absorbing panel that improves the sound absorption effect. Background Technology

[0002] Generally, a duct is a passage through which gaseous fluids, such as exhaust gases from the combustion of a combustion engine or air, flow, and is widely used in various mechanical devices or structures. For example, ducts can be installed in structures such as buildings or ships, and fans may be installed inside to facilitate fluid flow as needed. When a fan is installed inside a duct, fluid flow becomes smooth, but there is a problem in that noise generated by the fan is transmitted through the duct. Furthermore, even without installing a fan inside the duct, fluid noise can occur due to friction with the duct as the fluid flows; therefore, various technologies are currently being developed to reduce noise generated in ducts.

[0003] Types of silencers include sound-absorbing types that generate noise using sound-absorbing materials, interference types that generate noise by dividing the sound wave path, changing the length of each path, and causing phase discrepancies or merging of the sound waves, expansion types that generate noise by expanding and then contracting the sound wave path, and resonance types that generate noise by dissipating sound energy using resonance. Among these, sound-absorbing silencers are equipped with multiple baffles inside to improve sound absorption performance within a limited length. Conventionally, baffles were fixed to the housing by welding to prevent them from detaching from the silencer housing. However, there are problems in that it is difficult to fix baffles by welding within a narrow housing and it is difficult to weld them in the correct position.

[0004] Consequently, a silencer with a structure that allows the baffle to be easily installed in the housing became necessary. Prior art literature

[0005] Republic of Korea Registered Patent No. 10-1030440 (April 14, 2011) The problem to be solved

[0006] The technical problem to be solved by the present invention is to provide a noise reduction device that facilitates the installation of a sound-absorbing panel that improves the sound absorption effect.

[0007] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0008] A noise reduction device according to an embodiment of the present invention for achieving the above technical objective comprises: a housing having a fluid space formed therein and an inlet and an outlet formed at each end, respectively, communicating with the fluid space for fluid flow; at least one sound-absorbing panel disposed within the fluid space along the direction of fluid flow, with each side end fixed to the inner surface of the housing to absorb noise entering through a sound-absorbing surface exposed to the fluid space; a plurality of nut members inserted at both side ends of the sound-absorbing panel in contact with the housing; a plurality of fastening holes penetrating the housing and communicating with the nut members; and a plurality of bolt members inserted from the outside of the housing, passing through the fastening holes and coupling with the nut members to fix the sound-absorbing panel to the housing.

[0009] The nut member can slide into the interior of the sound-absorbing panel along the longitudinal direction of the bolt member.

[0010] The above noise reduction device may further include an elastic member inserted between the sound-absorbing panel and the nut member to push the nut member toward the housing.

[0011] The above sound-absorbing panels may be formed with multiple different lengths and arranged in series along the direction of fluid flow.

[0012] The above sound-absorbing panel may include a perforated plate having a sound-absorbing surface formed on an outer surface and a fixing surface formed on an inner surface, with a plurality of perforations formed penetrating the sound-absorbing surface and the fixing surface, and a sound-absorbing material inserted into the inside of the perforated plate and in close contact with the fixing surface.

[0013] The longitudinal cross-sectional area of ​​the end portions of the perforated plate that are adjacent to the inlet and the outlet, respectively, may gradually decrease as it approaches the inlet and the outlet. Effects of the invention

[0014] According to the present invention, since a sound-absorbing panel that absorbs noise is screw-coupled to a housing, the installation of the sound-absorbing panel is easy, and the sound-absorbing panel can be fixed in an accurate position within the housing. Brief explanation of the drawing

[0015] FIG. 1 is a perspective view illustrating a noise reduction device according to one embodiment of the present invention. Figure 2 is a cutaway perspective view of the noise reduction device of Figure 1. Figure 3 is an enlarged view of the sound-absorbing panel. Figure 4 is an operation diagram illustrating the installation of sound-absorbing panels in a housing. FIG. 5 is an enlarged view of a sound-absorbing panel according to another embodiment of the present invention. Figure 6 is an operational diagram illustrating the installation of sound-absorbing panels in a housing. Figure 7 is a diagram showing the usage state of the noise reduction device. Specific details for implementing the invention

[0016] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0017] Hereinafter, a noise reduction device according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

[0018] FIG. 1 is a perspective view illustrating a noise reduction device according to one embodiment of the present invention.

[0019] The noise reduction device (1) according to the present invention is a device for reducing noise caused by fluid flow within a duct, and at least one may be installed between a first duct (D1) having a first flow path (not shown) formed inside and a second duct (D2) spaced apart from the first duct (D1) having a second flow path (not shown) formed inside. At this time, the first duct (D1) and the second duct (D2) may be ducts installed on the intake side of an engine, and the direction of fluid flow may be from the first duct (D1) to the second duct (D2) or from the second duct (D2) to the first duct (D1).

[0020] The noise reduction device (1) has the feature that the sound-absorbing panel (20) that absorbs noise is screw-coupled to the housing (10), so the installation of the sound-absorbing panel (20) is easy, and the sound-absorbing panel (20) can be fixed in an accurate position within the housing (10).

[0021] Hereinafter, the noise reduction device (1) will be described in detail with reference to FIGS. 2 to 4.

[0022] FIG. 2 is a cutaway perspective view of the noise reduction device of FIG. 1, FIG. 3 is an enlarged view of the sound-absorbing panel, and FIG. 4 is an operation diagram to explain the installation of the sound-absorbing panel in the housing.

[0023] A noise reduction device (1) according to the present invention comprises a housing (10), at least one sound-absorbing panel (20), a plurality of nut members (30), a plurality of fastening holes (40), and a plurality of bolt members (50).

[0024] The housing (10) is a rectangular or polygonal tube-shaped member having a flow space (10a) formed inside, and an inlet (10b) and an outlet (10c) are formed at each end, respectively, in communication with the flow space (10a) through which fluid flows. That is, fluid introduced into the housing (10) through the inlet (10b) from the first duct (D1) or the second duct (D2) passes through the flow space (10a) and is discharged to the second duct (D2) or the first duct (D1) through the outlet (10c). Although the drawing shows the longitudinal cross-sectional area of ​​both ends of the housing (10) as being formed in a structure that gradually narrows toward the first duct (D1) and the second duct (D2), it is not limited thereto, and the shape of the housing (10) can be varied in many ways. At least one sound-absorbing panel (20) is installed inside the flow space (10a).

[0025] The sound-absorbing panel (20) absorbs noise entering through the sound-absorbing surface (21a) exposed to the flow space (10a), and at least one is arranged within the flow space (10a) along the direction of fluid flow. Each sound-absorbing panel (20) can be arranged such that both side ends are fixed to the inner surface of the housing (10) so that the sound-absorbing surface (21a) faces the flow space (10a). Although the drawing shows four sound-absorbing panels (20) installed in a superposition manner inside the housing (10), this is not limited thereto, and the number of installed sound-absorbing panels (20) can be increased or decreased as needed. The sound-absorbing panel (20) includes a perforated plate (21) and a sound-absorbing material (22).

[0026] The perforated plate (21) is a plate made of a non-metallic material such as plastic, and a sound-absorbing surface (21a) is formed on the outer surface exposed to the flow space (10a), and a fixed surface (21b) is formed on the inner surface. Since the perforated plate (21) is formed of a non-metallic material, the noise reduction device (1) can be made lighter, and as a result, the total weight of the duct where the noise reduction device (1) is installed and the ship where the duct is installed can be reduced, thereby saving energy. The perforated plate (21) has a plurality of perforations (21c) that penetrate the sound-absorbing surface (21a) and the fixed surface (21b), and a sound-absorbing material (22), which will be described later, is inserted into the inner side. In addition, the longitudinal cross-sectional area of ​​the end portions of the perforated plate (21) that are close to the inlet (10b) and the outlet (10c), respectively, can gradually decrease as it faces the inlet (10b) and the outlet (10c). The longitudinal cross-sectional area of ​​the end portion of the perforated plate (21) is formed in a shape that gradually decreases toward the inlet (10b) and the outlet (10c), thereby reducing the generation of vortices caused by turbulence and minimizing noise and vibration caused by the generation of vortices. When vortices are generated by turbulence at the end portion of the perforated plate (21), pressure waves with a constant period are generated, and the pressure waves caused by the vortices form standing waves within the housing (10) or duct and cause resonance, which has the problem of generating noise and vibration. In the present invention, since the longitudinal cross-sectional area of ​​the end portion of the perforated plate (21) gradually decreases, the generation of vortices caused by turbulence is prevented in advance, thereby minimizing noise and vibration.

[0027] The sound-absorbing material (22) is a component that absorbs noise entering through a plurality of perforations (21c), and is inserted into the inner side of the perforated plate (21) and adheres to the fixed surface (21b). The sound-absorbing material (22) may be formed from a porous synthetic resin material, such as a sponge, for example. However, the sound-absorbing material (22) is not limited to being formed from a porous synthetic resin material, but can be modified into various forms capable of absorbing noise. For example, the sound-absorbing material (22) may be formed from a foaming agent formed by foaming synthetic or natural materials, or a fiber material with excellent absorption capacity. A glass fiber material may be interposed between the perforated plate (21) and the sound-absorbing material (22).

[0028] The glass fiber material is intended to prevent the sound-absorbing material (22) from detaching, and one side is connected to the fixed surface (21b) of the perforated plate (21) and the other side is connected to the sound-absorbing material (22), thereby allowing the sound-absorbing material (22) to be fixed at a certain position on the perforated plate (21). If necessary, the glass fiber material may be omitted, and if the glass fiber material is omitted, an adhesive may be applied to at least one of the side of the sound-absorbing material (22) in contact with the fixed surface (21b) and the fixed surface (21b) in contact with the sound-absorbing material (22) to fix the sound-absorbing material (22).

[0029] A plurality of nut members (30) are inserted into both side ends of the sound-absorbing panel (20) that are in contact with the inner surface of the housing (10). The nut members (30) may be ordinary nuts with screw threads formed on their inner surfaces. As shown in FIG. 3 (a), the plurality of nut members (30) are spaced apart along the longitudinal direction (refer to the x-direction in FIG. 2) of the sound-absorbing panel (20), and each nut member (30) may be inserted into the inner side of the sound-absorbing panel (20) and coupled as shown in FIG. 3 (b).

[0030] A plurality of fastening holes (40) are formed through the housing (10) described above. The fastening holes (40) are holes for fixing the sound-absorbing panel (20) and are connected to the nut member (30) by penetrating the housing (10) in a direction perpendicular to the direction of fluid flow. That is, a plurality of fastening holes (40) are formed through one side and the other side of the housing (10) with the flow space (10a) in between, and the plurality of fastening holes (40) are spaced apart along the length direction of the housing (10) (refer to the x direction in FIG. 2).

[0031] The sound-absorbing panel (20) can be fixed to the housing (10) by a bolt member (50). The bolt member (50) is a conventional bolt with threads formed on its outer surface, inserted from the outside of the housing (10), and can pass through the fastening hole (40) to be coupled with the nut member (30). That is, as shown in FIG. 4, when the bolt member (50) is screw-coupled to the nut member (30) while the nut member (30) inserted at both ends of the sound-absorbing panel (20) and the fastening hole (40) formed through the housing (10) are in communication with each other, the sound-absorbing panel (20) is fixed to the housing (10). Since the sound-absorbing panel (20) is screw-coupled to the housing (10) by means of a bolt member (50) and a nut member (30), the installation and removal of the sound-absorbing panel (20) are easy, and the sound-absorbing panel (20) can be fixed to an accurate position within the housing (10) compared to the conventional case where the sound-absorbing panel (20) is fixed to the housing (10) by welding. In the conventional case where the sound-absorbing panel (20) is fixed to the housing (10) by welding, there was a problem in that welding was not easy and it was difficult to weld in an accurate position because work had to be done inside the narrow housing (10). In the present invention, since the bolt member (50) passes through the fastening hole (40) on the outside of the housing (10) and is screw-coupled to the nut member (30), the work is easy and the sound-absorbing panel (20) can be fixed in an accurate position, thereby improving the sound absorption effect.

[0032] Hereinafter, a noise reduction device (1) according to another embodiment of the present invention will be described in detail with reference to FIGS. 5 and 6.

[0033] FIG. 5 is an enlarged view of a sound-absorbing panel according to another embodiment of the present invention, and FIG. 6 is an operation diagram illustrating the installation of a sound-absorbing panel in a housing.

[0034] In a noise reduction device (1) according to another embodiment of the present invention, a nut member (30) is coupled so as to be slidably movable into the interior of a sound-absorbing panel (20) along the longitudinal direction of a bolt member (50). The noise reduction device (1) according to another embodiment of the present invention is substantially the same as the previously described embodiment except that the nut member (30) is coupled so as to be slidably movable into the interior of a sound-absorbing panel (20) along the longitudinal direction of a bolt member (50). Therefore, this is described in detail, and unless otherwise noted, the description of the remaining components is replaced by the previously described details.

[0035] The nut member (30) can slide into the interior of the sound-absorbing panel (20) along the longitudinal direction of the bolt member (50). Referring more specifically to FIG. 5, a receiving space (21d) for receiving the nut member (30) is formed in a recess at at least one of the two side ends of the sound-absorbing panel (20), and an elastic member (60) that provides elastic force to the nut member (30) is received in the receiving space (21d). The elastic member (60) is formed in the shape of a compression coil spring and is received in the receiving space (21d) but inserted between the sound-absorbing panel (20) and the nut member (30) to push the nut member (30) outward toward the housing (10). If necessary, a support member (61) that supports the elastic member (60) may be inserted into the receiving space (21d). Since the nut member (30) can slide into the sound-absorbing panel (20), as shown in FIG. 6 (a), when moving the sound-absorbing panel (20) to an installation position within the housing (10), the elastic member (60) can be compressed and the nut member (30) can be inserted into the receiving space (21d), making it easy to move and position the sound-absorbing panel (20). Once the position of the sound-absorbing panel (20) is completed, as shown in FIG. 6 (b), the elastic member (60) can be relaxed back to its original state to protrude the nut member (30) outside the receiving space (21d) and then combined with the bolt member (50). Although the drawing shows a structure in which a nut member (30) is slidably coupled to each of the two side ends of the sound-absorbing panel (20), it is not limited thereto. For example, the nut member (30) may be slidably coupled to only one side end of the sound-absorbing panel (20), and the nut member (30) may be inserted and coupled to the other side end.

[0036] Figure 7 is a diagram showing the usage state of the noise reduction device.

[0037] The noise reduction device (1) according to the present invention is connected to the intake side of the engine, and one noise reduction device (1) may be installed per engine. More specifically, the noise reduction device (1) may have a plurality of, for example, six, sound-absorbing panels (20) arranged overlappingly along the height direction (see z direction in FIG. 2) of the housing (10) inside the flow space (10a) to form a single sound-absorbing panel unit, and a plurality of such sound-absorbing panel units, for example, two, may be installed in series along the direction of fluid flow. At this time, the sound-absorbing panel (20) of the sound-absorbing panel unit (A) arranged in the front with respect to the direction of fluid flow and the sound-absorbing panel (20) of the sound-absorbing panel unit (B) arranged in the rear may be formed with different lengths. In the drawing, the length of the sound-absorbing panel (20) of the sound-absorbing panel unit (A) positioned in the front is shown as being longer than the length of the sound-absorbing panel (20) of the sound-absorbing panel unit (B) positioned in the rear, but this is not limited thereto, and the length of the sound-absorbing panel unit (B) positioned in the rear may be longer than the length of the sound-absorbing panel (20) of the sound-absorbing panel unit (A) positioned in the front.

[0038] For the smooth operation of the engine, the pressure loss allowed in the noise reduction device (1) is limited to a certain level or lower. As in the noise reduction device (1) of the present invention, six sound-absorbing panels (20) are overlapped and arranged along the height direction of the housing (10) inside the flow space (10a) to form one sound-absorbing panel unit, and when two such sound-absorbing panel units are installed in series, when the housing (10) is cut in the height direction, the cross-sectional area of ​​the flow space (10a) becomes 1.35 to 1.45 times the cross-sectional area where both sides of each sound-absorbing panel (20) are exposed to the flow space (10a), so that the total pressure loss can be within 33 mmAq.

[0039] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0040] 1: Noise reduction device 10: Housing 10a: Fluid space 10b: Inlet 10c: Outlet 20: Sound-absorbing panel 21: Perforated plate 21a: Sound-absorbing surface 21b: Fixed surface 21c: Perforation 22: Sound-absorbing material 30: Nut member 40: Fastening hole 50: Bolt member 60: Elastic member D1: 1st duct D2: 2nd duct

Claims

Claim 1 A housing having a fluid space formed inside and an inlet and an outlet formed at each end, respectively, communicating with the fluid space for fluid flow; at least one sound-absorbing panel disposed inside the fluid space along the direction of fluid flow, with each side end fixed to the inner surface of the housing to absorb noise entering through a sound-absorbing surface exposed to the fluid space; a plurality of nut members inserted at both side ends of the sound-absorbing panel in contact with the housing; a plurality of fastening holes penetrating the housing and communicating with the nut members; a plurality of bolt members inserted from the outside of the housing and passing through the fastening holes to combine with the nut members to fix the sound-absorbing panel to the housing; and an elastic member inserted between the sound-absorbing panel and the nut members to push the nut members toward the housing, wherein when the elastic member is compressed, the nut members slide into the interior of the sound-absorbing panel along the longitudinal direction of the bolt members, and when the elastic member is relaxed, the nut members slide and protrude to the exterior of the sound-absorbing panel. Noise reduction device. Claim 2 delete Claim 3 delete Claim 4 In claim 1, the sound-absorbing panels are formed with multiple different lengths and arranged in series along the direction of fluid flow, forming a noise reduction device. Claim 5 In claim 1, the sound-absorbing panel comprises a perforated plate having a sound-absorbing surface formed on an outer surface and a fixing surface formed on an inner surface, and a plurality of perforations formed penetrating the sound-absorbing surface and the fixing surface, and a sound-absorbing material inserted into the inner side of the perforated plate and in close contact with the fixing surface, a noise reduction device. Claim 6 In claim 5, the perforated plate is a noise reduction device in which the longitudinal cross-sectional area of ​​the end portions adjacent to the inlet and the outlet, respectively, gradually decreases as it approaches the inlet and the outlet.

Images