Sound insulation structure and ventilation device

Abstract

This sound insulation structure comprises a cylindrical member of which both ends are open. The cylindrical member is provided with a first opening formed in the inner surface, and a first resonance space formed between the inner surface and the outer surface. The first opening communicates with the first resonance space.

Description

Soundproofing structures, ventilation devices

[0001] The present invention relates to a sound insulating structure and a ventilation device.

[0002] Generally, sound-insulating structures are configured to block sound by physically blocking the path of the sound.

[0003] For example, Patent Document 1 discloses the following: A sound-insulating structure includes an elastic membrane, an elastic support wall erected on the membrane, and a weight erected on the membrane. The membrane is divided into multiple compartments by the support wall, and weights are located inside all or some of the multiple compartments, with each compartment containing a weight being one weight. The height of the support wall in a direction perpendicular to the membrane is greater than the height H2 of the weight extending in a direction perpendicular to the membrane. Each weight constitutes a spring-mass resonator having an elastic spring and a mass having a greater mass than the spring. The sound-insulating structure provides sufficient sound insulation, can be easily and stably placed on a curved support surface, and is thin and lightweight. The soundproof structure comprises a soundproof plate-shaped portion and a soundproof structure portion made of a soundproof structure, and at least one of the membrane portion and the support plate portion is integrally formed or joined with the soundproof plate-shaped portion, and the soundproof plate-shaped portion and the soundproof structure portion are positioned side by side in a plane.

[0004] WO2024 / 004919

[0005] However, structures that physically block the sound path place restrictions on use cases, so to resolve these restrictions, it is desirable to have a structure that does not physically block the sound path.

[0006] An object of the present invention is to provide a sound-insulating structure that eliminates the constraints of use cases.

[0007] One aspect of the present invention is a sound-insulating structure comprising a cylindrical member having both ends open, the cylindrical member having a first opening formed on an inner surface thereof and a first resonance space formed between the inner surface and the outer surface thereof, the first opening communicating with the first resonance space.

[0008] One aspect of the present invention is a sound-proofing structure comprising an outer peripheral member having a first hollow region extending in a first direction, the outer peripheral member comprising a first opening formed on an inner surface of the outer peripheral member, and a first resonance space formed in an inner portion of the outer peripheral member and communicating with the first opening.

[0009] 13 is a perspective view of a sound-insulating structure according to a first embodiment; FIG. 14 is a cross-sectional view of the sound-insulating structure of FIG. 1; FIG. 15 is an explanatory diagram of the principle of sound insulation; FIG. 16 is an explanatory diagram of a first use (an example in which the sound-insulating structure is applied to a blower) of the sound-insulating structure of the first embodiment; FIG. 17 is an explanatory diagram of a second use (an example in which the sound-insulating structure is applied to a duct) of the sound-insulating structure of the first embodiment; FIG. 18 is an explanatory diagram of a third use (an example in which the sound-insulating structure is applied to a workspace) of the sound-insulating structure of the first embodiment; FIG. 19 is an explanatory diagram of a fourth use (an example in which the sound-insulating structure is applied to a window sash) of the sound-insulating structure of the first embodiment; FIG. 19 is an explanatory diagram of a fifth use (an example in which the sound-insulating structure is applied to a conference room) of the sound-insulating structure of the first embodiment; FIG. 20 is an explanatory diagram of a sixth use (an example in which the sound-insulating structure is applied to a grinder) of the sound-insulating structure of the first embodiment; FIG. 22 is a perspective view of a sound insulating structure of modified example 3. FIG. 23 is a ZX plan view showing a cross section when the sound insulating structure body is cut along the two-dot chain line C1 in FIG. 15. FIG. 24 is a perspective view of a sound insulating structure of a second embodiment. FIG. 25 is a cross-sectional view of the sound insulating structure of FIG. 17. FIG. 26 is a perspective view of a sound insulating structure of modified example 4. FIG. 27 is a cross-sectional view of the sound insulating structure of FIG. 19. FIG. 28 is a perspective view of a sound insulating structure of modified example 5. FIG. 29 is a cross-sectional view of the sound insulating structure of FIG. 21. FIG. 29 is a diagram showing a device in which a sound insulating part is provided from a fan via a spacer.

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings for explaining the embodiment, the same components are generally designated by the same reference numerals, and repeated description thereof will be omitted.

[0011] (1) Configuration of sound insulating structure (first embodiment) The configuration of the sound insulating structure of the first embodiment will be described. Fig. 1 is a perspective view of the sound insulating structure of the first embodiment. Fig. 2 is a cross-sectional view of the sound insulating structure of Fig. 1. Fig. 2A is an XY plan view of the first sound insulating part 11 of Fig. 1 as viewed from the Z+ direction. Fig. 2B is a ZX plan view showing a cross section of the first sound insulating part 11 when cut along the two-dot chain line C1 of Fig. 1. Fig. 2C is a YZ plan view showing a cross section of the first sound insulating part 11 when cut along the two-dot chain line C2 of Fig. 1.

[0012] The sound-insulating structure 10 of the first embodiment has a resonant structure.

[0013] 1 and 2, the sound-insulating structure 10 includes a first sound-insulating part 11. The first sound-insulating part 11 has a cylindrical shape. The first sound-insulating part 11 forms the outer periphery of the sound-insulating structure 10.

[0014] The first sound insulating part 11 has a first hollow region H1. At least one first opening 111 is formed in one of the side surfaces of the first sound insulating part 11 that defines the first hollow region H1 (hereinafter referred to as the “inner side surface”).

[0015] As shown in Fig. 2, a first resonance space 112 is formed inside the first sound insulating part 11 (Figs. 2A and 2C). The first resonance space 112 communicates with the first opening 111 and extends along the outer periphery of the first hollow region H1. The first resonance space 112 has a circular ring shape with two ends. As a result, sound passing through the first hollow region H1 propagates to the first resonance space 112 via the first opening 111.

[0016] The number and total area of ​​the first openings 111 and the shape and volume of the first resonance spaces 112 are designed taking into consideration the sound insulation characteristics (hereinafter referred to as "first sound insulation characteristics") of the first sound-insulating parts 11. In other words, the first sound insulation characteristics are determined by the number and total area of ​​the first openings 111 and the shape and total volume of the first resonance spaces 112.

[0017] 2A, when the first resonant space 112 has two ends, the sound insulation characteristics of low frequency sounds are improved. When the first resonant space 112 does not have ends, the sound insulation characteristics of high frequency sounds are improved.

[0018] 2A, when the first resonance space 112 has a circular ring shape, the sound insulation characteristics for low frequency sounds are improved, and when the first resonance space 112 has a rectangular shape, the sound insulation characteristics for high frequency sounds are improved.

[0019] (2) Principle of Sound Insulation The principle of sound insulation in the first embodiment will be explained below. Fig. 3 is an explanatory diagram of the principle of sound insulation.

[0020] 3 , the first resonance space 112 cancels out air vibrations within the first resonance space 112 through a resonance phenomenon. Specifically, a portion of a sound W1 (P1) with a first phase P1 generated from a sound source enters the first resonance space 112 from the first opening 111 as it passes through the first hollow region H1. The sound W1 (P1) with the first phase P1 that enters the first resonance space 112 becomes a sound W2 (P2) with a second phase P2 in the first resonance space 112.

[0021] The first phase P1 and the second phase P2 satisfy the following relational expression: P2-P1=180 (Equation 1)

[0022] The sound W2 (P2) of the second phase P2 emitted from the first resonant space 112 cancels out the sound W1 (P1) of the first phase P1. As a result, the sound W1 (P1) of the first phase P1 generated from the sound source is canceled out by the sound W2 (P2) of the second phase P2 when passing through the first hollow region H1. As a result, the sound generated from the sound source is blocked by the first sound-insulating structure 10.

[0023] (3) Use of Sound Insulating Structure Use of the sound insulating structure of the first embodiment will be described.

[0024] (3-1) First Use of Sound-Insulating Structure (For Air Blower) A first use of the sound-insulating structure of the first embodiment will be described. The first use of the sound-insulating structure of the first embodiment is an example in which the sound-insulating structure 10 is used to insulate noise generated from an air blower (mainly noise generated from a motor (hereinafter referred to as "motor noise")). Figure 4 is an explanatory diagram of the first use of the sound-insulating structure of the first embodiment (an example in which the sound-insulating structure is applied to an air blower).

[0025] As shown in FIG. 4, the sound-insulating structure 10 is disposed at the end of the fan FAN on the Z+ side (i.e., on the air flow path).

[0026] When the sound-insulating structure 10 is used in a fan unit FAN, the air blown by the fan unit FAN passes through the first hollow area H1, so that the motor noise of the motor that drives the fan unit FAN can be blocked without impeding the air blown by the fan unit FAN.

[0027] (3-2) Second Use of Sound Insulating Structure (For Duct) A second use of the sound insulating structure of the first embodiment will be described. The second use of the sound insulating structure of the first embodiment is an example in which the sound insulating structure 10 is used to insulate sound generated from a duct. Figure 5 is an explanatory diagram of the second use of the sound insulating structure of the first embodiment (an example in which the sound insulating structure is applied to a duct).

[0028] 5, the sound insulating structure 10 has connecting portions (not shown) that can be connected to the plurality of ducts DUC1 to DUC2. In other words, the sound insulating structure 10 has a function of connecting to the plurality of ducts DUC1 to DUC2.

[0029] When the sound-insulating structure 10 is used in a duct, the air inside the duct passes through the first hollow region H1, so that sound generated from the duct can be insulated without impeding the flow of air inside the duct.

[0030] (3-3) Third Use of Sound Insulating Structure (for Workspaces) A ​​third use of the sound insulating structure of the first embodiment will now be described. The third use of the sound insulating structure of the first embodiment is an example in which the sound insulating structure 10 is used to insulate sound directed from the inside of a workspace to the outside (hereinafter referred to as "internal sound") and sound directed from the outside of the workspace to the inside (hereinafter referred to as "external sound"). Figure 6 is an explanatory diagram of the third use of the sound insulating structure of the first embodiment (an example in which the sound insulating structure is applied to a workspace).

[0031] 6, the sound-insulating structure 10 is disposed at the end of the workspace WS on the Z+ side (i.e., the ceiling of the workspace WS) (FIG. 6A), so that a first resonance space 112 is formed inside the frame F on the Z+ side of the workspace WS.

[0032] When the sound-insulating structure 10 is used in a workspace WS, the ceiling of the workspace WS can be opened, thereby achieving sound-insulating functionality without having to consider legal regulations (for example, the Fire Service Act).

[0033] (3-4) Fourth Use of Sound-Insulating Structure (for Window Sash) A fourth use of the sound-insulating structure of the first embodiment will be described. The fourth use of the sound-insulating structure of the first embodiment is an example in which the sound-insulating structure 10 is used in a window sash. Fig. 7 is an explanatory diagram of the fourth use of the sound-insulating structure of the first embodiment (an example in which the sound-insulating structure is applied to a window sash).

[0034] As shown in Fig. 7, the sound-insulating structure 10 is disposed in a portion of the window sash S other than the glass window GW. In other words, when the glass window GW is in a closed state, the sound-insulating structure 10 is disposed so as to surround the periphery of the glass window GW (Fig. 7A).

[0035] When the glass window GW is in an open state, the sound insulating structure 10 is configured to surround the opening OP.

[0036] When the sound-insulating structure 10 is used in a window sash S, the sound-insulating structure 10 is disposed so as to surround the glass window GW. This blocks sound that passes through an opening OP formed when the glass window GW is opened. As a result, sound can be blocked even when the glass window GW is open.

[0037] (3-5) Fifth Use of Sound Insulating Structure (for Conference Room) A fifth use of the sound insulating structure of the first embodiment will be described. The fifth use of the sound insulating structure of the first embodiment is an example in which the sound insulating structure 10 is used in a conference room. Fig. 8 is an explanatory diagram of the fifth use of the sound insulating structure of the first embodiment (an example in which the sound insulating structure is applied to a conference room).

[0038] 8, an opening OP required by law (for example, the Fire Service Act) is placed at the top (end on the Z+ side) of the MR wall of the conference room. The sound-insulating structure 10 is placed at both ends (end on the X+ side and end on the X- side) of the opening OP.

[0039] (3-6) Sixth Use of Sound-Insulating Structure (For Crushing Device) A sixth use of the sound-insulating structure of the first embodiment will be described. The sixth use of the sound-insulating structure of the first embodiment is an example in which the sound-insulating structure 10 is used to insulate sound generated inside a crushing device. Fig. 9 is an explanatory diagram of the sixth use of the sound-insulating structure of the first embodiment (an example in which the sound-insulating structure is applied to a crushing device).

[0040] As shown in FIG. 9, the crushing device configured to crush the object to be crushed OBJ0 is made up of a first part P1 to a third part P3.

[0041] The first portion P1 is a portion where the object to be crushed OBJ0 falls due to gravity in the Z-direction (direction of gravity). The sound-insulating structure 10 is disposed in the first portion P1 so that the first hollow region H1 is aligned with the Z-axis. In other words, the first opening 111 (not shown) opens toward the X-direction.

[0042] The second section P2 is a section that transports the objects to be crushed OBJ0 in the X-direction. The crushing section CUT is disposed in the second section P2. The crushing section CUT is configured to crush the objects to be crushed OBJ0 and turn them into crushed objects OBJ1. The sound generated from the crushing section CUT (hereinafter referred to as "crushing sound") is insulated by the sound-insulating structure 10 as it passes through the first section P1. As a result, the crushing sound leaking to the outside from the crushing device is reduced.

[0043] The third section P3 is a section where the pulverized object OBJ1 falls due to gravity in the Z-direction (gravity direction).

[0044] (3-7) Seventh Use of Sound-Insulating Structure (For Dryer) A seventh use of the sound-insulating structure of the first embodiment will be described. The seventh use of the sound-insulating structure of the first embodiment is an example in which the sound-insulating structure 10 is used to insulate sound generated inside a dryer. Fig. 10 is an explanatory diagram of the seventh use of the sound-insulating structure of the first embodiment (an example in which the sound-insulating structure is applied to a dryer).

[0045] 10 , the sound-insulating structure 10 is disposed at the inlet D1 and outlet D2 of the dryer D. The sound generated by the motor M is insulated by the sound-insulating structure 10 when passing through the inlet D1 and outlet D2.

[0046] (5) Modifications A modification of the first embodiment will be described.

[0047] (5-1) Modification 1 Modification 1 of the first embodiment will be described below. Modification 1 is an example in which a sound insulating portion is provided in the first hollow region H1.

[0048] (5-1-1) Configuration of sound insulating structure of modified example 1 The configuration of the sound insulating structure of modified example 1 will be described. Fig. 11 is a perspective view of the sound insulating structure of modified example 1. Fig. 12 is a cross-sectional view of the sound insulating structure of Fig. 11. Fig. 12A is an XY plan view of the first sound insulating part 11 of Fig. 11 as viewed from the Z+ direction. Fig. 12B is a ZX plan view showing a cross section of the first sound insulating part 11 when cut along the two-dot chain line C1 of Fig. 11. Fig. 12C is a YZ plan view showing a cross section of the first sound insulating part 11 when cut along the two-dot chain line C2 of Fig. 11.

[0049] 11 and 12, the sound-insulating structure 10 includes a first sound-insulating part 11 and a second sound-insulating part 12. The first sound-insulating part 11 is the same as that in the first embodiment.

[0050] The second sound insulating part 12 has a cylindrical shape. At least one second opening 121 is formed in the outer surface of the second sound insulating part 12. The shape and dimensions of the second opening 121 are different from those of the first opening 111.

[0051] The sound-insulating structure includes a second sound-insulating portion disposed inside the inner surface of a tubular member. The second sound-insulating portion includes a second opening formed on the outer surface of the second sound-insulating portion facing the inner surface of the tubular member, and a second resonance space formed inside the second sound-insulating portion. The second opening is connected to the second resonance space, and the volume of the first resonance space is different from the volume of the second resonance space. The tubular member of the sound-insulating structure is cylindrical, and the second sound-insulating portion is columnar. By disposing a similar sound-insulating portion inside the tubular member, the area of ​​the sound-insulating surface can be increased. This allows for an increased number of openings. This further improves the sound-insulating performance of the sound-insulating structure. Specifically, as shown in FIG. 12 , a second resonance space 122 is formed inside the second sound-insulating portion 12 ( FIGS. 12A and 12C ). The second resonance space 122 is connected to the second opening 121 and extends along the outer periphery of the second sound-insulating portion 12. The second resonance space 122 has an annular shape with no end portions, so that sound passing through the first hollow region H1 propagates into the second resonance space 122 via the second opening 121.

[0052] The number and total area of ​​the second openings 121 and the shape and volume of the second resonance spaces 122 are designed taking into consideration the sound insulation characteristics (hereinafter referred to as "second sound insulation characteristics") of the second sound insulating part 12. In other words, the second sound insulation characteristics are determined by the number and total area of ​​the second openings 121 and the shape and total volume of the second resonance spaces 122.

[0053] The second sound insulating characteristic is different from the first sound insulating characteristic.

[0054] (5-1-3) Summary of Modification 1 According to Modification 1, in addition to the first sound-insulating portion 11 having the first sound-insulating characteristic, a second sound-insulating portion 12 having the second sound-insulating characteristic different from the first sound-insulating characteristic is provided. This makes it possible to insulate sounds in a wider frequency band than in the first embodiment.

[0055] (5-2) Modification 2 A description will now be given of Modification 2 of the first embodiment. Modification 2 is an example in which the sound insulation structure 10 has a second hollow region H2 in addition to the first hollow region H1.

[0056] (5-2-1) Configuration of Sound-Isolating Structure of Modification 2 The configuration of the sound-insulating structure of Modification 2 will be described. Fig. 13 is a perspective view of the sound-insulating structure of Modification 2. Fig. 14 is a diagram showing an example in which a cable is inserted into the sound-insulating structure of Fig. 13.

[0057] 13 and 14, the sound-insulating structure 10 includes a first sound-insulating part 11 and a cylindrical part 13. The first sound-insulating part 11 is the same as that in the first embodiment.

[0058] The cylindrical portion 13 has a cylindrical shape and has a second hollow region H2.

[0059] 14, a cable is inserted into the second hollow region H2, that is, the cylindrical portion 13 functions as a cable cover.

[0060] (5-2-2) Summary of Modification 2 According to Modification 2, the sound-insulating structure 10 is applied to the cable cover, so that it is possible to insulate the sound generated from the cable cover.

[0061] (5-3) Modification 3 Modification 3 of the first embodiment will be described. Modification 3 is an example in which the sound-insulating structure 10 insulates sound by using an interference structure.

[0062] (5-3-1) Configuration of sound insulation structure of modified example 3 The configuration of the sound insulation structure of modified example 3 will be described. Fig. 15 is a perspective view of the sound insulation structure of modified example 3. Fig. 16 is a ZX plan view showing a cross section when the sound insulation structure body is cut along the two-dot chain line C1 in Fig. 15.

[0063] 15 and 16, the sound-insulating structure 10 includes a third sound-insulating part 16, first openings 14a and 14b, and second openings 15a and 15b. The third sound-insulating part 16 has a cylindrical shape. The third sound-insulating part 16 is formed inside the sound-insulating structure 10.

[0064] A third sound insulating portion 16 is formed between the first opening 14a and the first opening 14b.

[0065] A first hollow region H1 is formed between second opening 15a and second opening 15b.

[0066] The third sound insulating part 16 communicates with the first openings 14a and 14b while making a detour inside the sound insulating structure 10. Inside the third sound insulating part 16, a third hollow region H3 is formed.

[0067] (5-3-2) Principle of Sound Insulation in Modification 3 The principle of sound insulation in Modification 3 will be explained.

[0068] 16, the first hollow region H1 has a path length L1. The third sound insulating portion 16 has a path length L2 that is longer than the path length L1. The path length L2 is designed so that the phase of the sound exiting the first opening 14b is inverted relative to the phase of the sound entering the third sound insulating portion 16 from the first opening 14a. In other words, the first phase P1 and the second phase P2 satisfy the following relational expression: P2-P1=180 (Equation 1)

[0069] A sound W1 (P1) emitted from a sound source S has a first phase P1. The sound W1 (P1) propagates from the first opening 14a into the third sound-insulating part 16, and also propagates from the second opening 15a into the first hollow region H1.

[0070] The sound W1 (P1) propagated through the third sound-insulating portion 16 becomes sound W2 (P2) with the second phase P2 when it exits through the first opening 14b. The sound W1 (P1) propagated through the first hollow region H1 exits through the second opening 15b as sound W1 (P1).

[0071] The sound W2 (P2) emitted from the first opening 14b interferes with the sound W1 (P1) emitted from the second opening 15b, and the two are canceled out. As a result, the sound generated from the sound source S is blocked by the sound-insulating structure 10.

[0072] (5-3-3) Summary of Modification 3 According to Modification 3, the sound-insulating structure 10 has an interference structure instead of a resonance structure. This makes it possible to achieve sound insulation by using the interference phenomenon.

[0073] (7) Configuration of Sound-Isolating Structure (Second Embodiment) The configuration of a sound-insulating structure of a second embodiment will be described. Explanations of the sound-insulating principle and the sound-insulating structure that overlap with those of the first embodiment will be omitted. The sound-insulating structure of the second embodiment can also be applied to each of the uses of the sound-insulating structure of the first embodiment already described.

[0074] The third sound insulating part 21 in the second embodiment has a plurality of resonance spaces 212. This makes it possible to achieve better sound insulating performance in a sound insulating structure of the same size (having resonance spaces of the same volume).

[0075] Fig. 17 is a perspective view of a sound insulating structure of the second embodiment. Fig. 18 is a cross-sectional view of the sound insulating structure of Fig. 17. Fig. 18A is an XY plan view of the third sound insulating part 21 of Fig. 17 when viewed from the Z+ direction. Fig. 18B is a ZX plan view showing a cross section of the third sound insulating part 21 when cut along the two-dot chain line C201 in Fig. 17. Fig. 18C is a YZ plan view showing a cross section of the third sound insulating part 21 when cut along the two-dot chain line C202 in Fig. 17.

[0076] The sound-insulating structure 20 of the second embodiment has a resonant structure. The sound-insulating structure includes a cylindrical member with both ends open. The cylindrical member has a first opening formed on its inner surface and a first resonance space formed between its inner surface and outer surface. The first opening communicates with the first resonance space. This blocks sound waves passing through the hollow space inside the cylindrical member, thereby reducing noise and the like.

[0077] The sound-insulating structure 20 of the second embodiment is characterized by having multiple resonant structures. As a result, unlike the first embodiment, it is possible to achieve a favorable sound-insulating effect with only one structure, the third sound-insulating part 21, without disposing the second sound-insulating part 12 inside the first sound-insulating part 11.

[0078] Specifically, as shown in Figures 17 and 18, at least one opening 211 is formed in the inner surface of the third sound insulating part 21. The opening 211 is formed as a rectangular slit extending in the circumferential direction. A resonance space 212 is formed inside the third sound insulating part 21. The resonance space 212 communicates with the opening 211 and extends along the inner periphery of the third sound insulating part 21. As a result, sound passing through the hollow region (cylindrical space) inside the third sound insulating part 21 propagates into the resonance space 212 via the opening 211.

[0079] The first opening of the sound-insulating structure is a slit extending in the circumferential direction of the cylindrical third sound-insulating part 21. Specifically, as shown in FIGS. 17 and 18 , a portion of the opening 211 formed on the inner surface of the third sound-insulating part 21 has a rectangular (rectangular) slit shape extending in the circumferential direction. That is, the length of the opening 211 in the circumferential direction is shorter than the length of the opening 211 in the Z-axis direction. The openings 211 are formed in a line along the inner surface of the third sound-insulating part 21. This controls the entry of air (wind) from the opening 211 into the resonance space 212 and suppresses the generation of whistling noise caused by airflow passing through the hollow space surrounded by the third sound-insulating part 21 in the Z-axis direction. In particular, the whistling noise generated from the opening 211 can be suppressed more effectively than when the opening 211 is large in the axial direction (Z-axis direction) of the cylindrical third sound-insulating part 21 (for example, a rectangular opening extending in the axial direction).

[0080] The partitions of the sound-insulating structure are formed in the radial direction of the cylindrical member and are components that divide the inside of the cylindrical member into multiple resonance spaces. Specifically, as shown in Figures 17 and 18, a partition wall 213 extending in the radial direction is formed inside the third sound-insulating part 21. The partition wall 213 can divide the resonance space 212 into multiple resonance spaces 212a, 212b. This makes it possible to form multiple resonance spaces 212 inside the third sound-insulating part 21, which is a single structure. A favorable sound-insulating effect can be achieved with a small number of components.

[0081] In the sound-insulating structure, the multiple openings and multiple resonance spaces are arranged line-symmetrically when viewed along the central axis of the tubular member. Specifically, as shown in FIG. 18A , two slit-shaped openings 211a and 211b are arranged facing each other on the inner surface of the third sound-insulating part 21. Furthermore, two sets of rectangular slit openings 211 and resonance spaces 212 (i.e., the set of opening 211a and resonance space 212a, and the set of opening 211b and resonance space 212b) are arranged line-symmetrically when viewed along the central axis (Z-axis) of the third sound-insulating part 21. This allows the third sound-insulating part 21 to be manufactured by combining components of the same shape. Because the tubular member can be formed by combining a small number of parts, the number of different parts can be reduced, thereby lowering manufacturing costs.

[0082] The sound-insulating structure 20 can be mounted in a ventilation device having a vent through which gas can pass (for example, including but not limited to, the air blowers, ducts, workspaces, window sashes, conference rooms, grinding devices, and dryers described above as the first to seventh uses of the sound-insulating structure). This makes it possible to suppress noise generated in the ventilation device without blocking the flow of gas passing through the vent.

[0083] The resonant frequency of the first resonant space is approximately equal to the peak frequency of sound generated in the ventilation device. Specifically, the sound-insulating structure 20 is designed so that the ratio between the volume of the resonant space 212 and the area of ​​the opening 211 corresponds to the peak frequency of sound generated from a noise source (e.g., a fan) of the ventilation device in which the sound-insulating structure is installed. More specifically, it is preferable to design the sound-insulating structure 20 so that the resonant frequency of the sound-insulating structure 20, determined based on the ratio between the volume of the resonant space 212 and the area of ​​the opening 211, is approximately equal to the peak frequency of sound generated from the noise source (or any of multiple peak frequencies, if there are multiple peak frequencies) (e.g., within a frequency error of 10%). This allows the sound-insulating structure to effectively reduce noise of a specific frequency generated by a fan or the like of the ventilation device.

[0084] (8) Modification A modification of the second embodiment will now be described.

[0085] (8-1) Modification 4 Modification 4 of the second embodiment will be described. Modification 4 is an example in which the opening has a rectangular shape. The third sound-insulating part 22 in Modification 4 has an opening 221 that is a rectangular slit extending along the inner periphery of the third sound-insulating part 22. That is, the length of the opening 221 in the inner periphery direction is shorter than the length of the opening 221 in the Z-axis direction. This allows for more suppression of whistling noise generated from the opening 221 than when the opening 221 is larger in the axial direction (Z-axis direction) of the cylindrical third sound-insulating part in a sound-insulating structure of the same size (having the same volume of resonance space). (For example, a rectangular opening extending in the axial direction) is used. The third sound-insulating part 22 in Modification 4 has multiple resonance spaces 222 with different volumes. This allows for excellent sound-insulating performance against noise with multiple peak frequencies that pass through the hollow region inside the cylindrical member, using only the single third sound-insulating part 22. In other words, a sound-insulating structure of the same size can achieve excellent sound-insulating performance against noises having multiple peak frequencies.

[0086] (8-1-1) Configuration of sound insulating structure of modified example 4 The configuration of the sound insulating structure of modified example 4 will be described. Fig. 19 is a perspective view of the sound insulating structure of modified example 4. Fig. 20 is a cross-sectional view of the sound insulating structure of Fig. 19. Fig. 20A is an XY plan view of the third sound insulating part 22 of Fig. 19 when viewed from the Z+ direction. Fig. 20B is a ZX plan view showing a cross section of the third sound insulating part 22 when cut along the two-dot chain line C211 of Fig. 19. Fig. 20C is a YZ plan view showing a cross section of the third sound insulating part 22 when cut along the two-dot chain line C212 of Fig. 19.

[0087] As shown in FIGS. 19 and 20 , ten rectangular slit openings (openings 221a-j) are formed on the inner surface of the third sound insulating part 22 of the sound insulating structure 20. The openings 221a-221j are formed in rectangular shapes extending circumferentially along the inner surface of the third sound insulating part 22. Resonance spaces 222a-222j are formed inside the third sound insulating part 22, communicating with each of the openings 221a-221j. The resonance spaces 222a-222j are formed between the inner and outer surfaces of the cylindrical member and communicate with their corresponding openings 221a-221j. The rectangular slit openings 221a-221j extend circumferentially, improving the sound incidence efficiency. The third sound insulating part 22 has multiple resonance spaces (e.g., resonance space 222a, resonance space 222b, and resonance space 222c) with different volumes, and these resonance spaces have different resonance frequencies. That is, since the third sound insulating portion 22 has a plurality of resonant frequencies, noise in a plurality of frequency bands can be effectively reduced by a single third sound insulating portion 22 .

[0088] (8-2) Modification 5 The third sound-insulating part 23 in Modification 5 has a circular opening 231. This makes it possible to achieve better sound-insulating performance in a sound-insulating structure of the same size (having resonance spaces of the same volume). The third sound-insulating part 23 in Modification 5 has multiple resonance spaces 232 with different volumes. This makes it possible to achieve, with only the third sound-insulating part 23, which is a single structure, excellent sound-insulating performance against noise with multiple peak frequencies that passes through the hollow space inside the cylindrical member. In other words, it is possible to achieve excellent sound-insulating performance against noise with multiple peak frequencies in a sound-insulating structure of the same size.

[0089] A fifth modification of the second embodiment will be described. In the fifth modification, the first opening of the sound-insulating structure is circular. Specifically, as shown in FIGS. 21 and 22 , a plurality of openings 231 are formed on the inner surface of the third sound-insulating part 23. Each opening 231 is circular and is arranged at approximately equal intervals along the inner circumferential surface of the third sound-insulating part 23. By providing circular openings 231, the size (opening area) of the openings 231 can be increased while suppressing whistling noise generated from the openings 231, compared to when openings of other shapes are provided (e.g., when rectangular openings or slit-shaped openings are provided). In other words, the area of ​​sound incidence into the resonance space 232 is increased. This allows the area of ​​the first opening formed on the inner surface to be increased, thereby improving the sound-insulating performance of the sound-insulating structure.

[0090] (8-2-1) Configuration of sound insulating structure of modified example 5 The configuration of the sound insulating structure of modified example 5 will be described. Fig. 21 is a perspective view of the sound insulating structure of modified example 5. Fig. 22 is a cross-sectional view of the sound insulating structure of Fig. 21. Fig. 22A is an XY plan view of the third sound insulating part 23 of Fig. 21 as viewed from the Z+ direction. Fig. 22B is a ZX plan view showing a cross section of the third sound insulating part 23 taken along the two-dot chain line C231 of Fig. 21. Fig. 22C is a YZ plan view showing a cross section of the third sound insulating part 23 taken along the two-dot chain line C232 of Fig. 21.

[0091] In the present disclosure, twelve circular openings 231a to 231l are arranged facing each other on the inner surface of the third sound insulating part 23. The openings 231a to 231l are circular. The openings 231a to 231l are formed on the inner surface of the cylindrical member. The resonance spaces 232a to 232l are formed between the inner and outer surfaces of the cylindrical member. The resonance spaces 232a to 232l are respectively connected to the openings 231a to 232l. By making the openings 231a to 231l circular, the vibrational energy of sound dissipated by the resonance spaces 232a to 232l can be increased. Specifically, as shown in FIGS. 21 and 22 , the circular openings 231a to 231l are arranged circumferentially along the inner surface of the third sound insulating part 23. The circular shapes of the openings 231a to 231l are designed to maximize the sound incidence area and minimize sound disturbance around the edges of the openings, thereby improving the efficiency with which sound enters the resonance spaces 232a to 232l and further improving the sound insulation capacity of the third sound-insulating part 23.

[0092] The cylindrical member of the sound-insulating structure includes a plurality of openings arranged in a line along the circumferential direction of the inner surface and a plurality of resonance spaces formed between the inner and outer surfaces and separated by partitions. Each of the openings is connected to at least one of the resonance spaces, and the volumes of the resonance spaces are different. Specifically, as shown in FIGS. 21 and 22 , a plurality of resonance spaces 232a-231l are formed inside the third sound-insulating part 23. The resonance spaces 232a-232l are separated from each other by a partition wall 233 and have different volumes. The resonance spaces 232a-232l are connected to corresponding circular openings 231a-231l. This allows sound insulation performance for a plurality of different frequencies to be achieved. Note that, although one opening is connected to one resonance space in the examples shown in FIGS. 21 and 22 , this is not limiting. For example, one opening may be connected to multiple resonance spaces, or multiple openings may be connected to one resonance space.

[0093] Among the multiple resonance spaces of the sound-insulating structure, the resonance space with the largest volume and the resonance space with the smallest volume are positioned adjacent to each other. This allows resonance spaces with sound-insulating performance for different resonance frequencies to be positioned adjacent to each other. Specifically, as shown in FIG. 22A , the resonance space 232a with the largest volume and the resonance space 232l with the smallest volume are positioned adjacent to each other. This allows the resonance space 232a that insulates low-frequency band sounds and the resonance space 232l that insulates high-frequency band sounds to be efficiently positioned, thereby achieving sound-insulating performance over a wide frequency range. This allows sound-insulating performance for a wider variety of frequencies to be preferably achieved.

[0094] (9) Example of Arrangement in a Ventilation Device When the sound-insulating structures of the above-described embodiments and modifications are implemented in a ventilation device having a vent through which gas can pass, the sound-insulating structure is provided so that the gas flowing through the vent passes through the hollow space inside the tubular member. This allows the sound-insulating structure to reduce noise generated in the ventilation device and leaking to the outside through a vent, such as an intake or exhaust port, of the ventilation device. Furthermore, it is preferable to provide a spacer between the vent of the ventilation device and the tubular member, which can adjust the distance from a noise source in the ventilation device to the first opening. This allows for more effective reduction of noise generated in the ventilation device.

[0095] FIG. 23 illustrates a ventilation device 40 having a ventilation section 34 provided on a base 32 and a spacer 30 provided between the ventilation section 34 and the third sound insulating section 21. A fan 31 is provided inside the ventilation section 34 of the ventilation device 40, and noise is generated from the ventilation device 40 when the fan 31 rotates. The ventilation device 40 is configured such that the distance L from the fan 31 to the opening 211 of the third sound insulating section 21 can be adjusted using the spacer 30. By appropriately setting the distance L, the sound insulation performance of the sound insulating structure can be improved compared to when the spacer 30 is not provided (i.e., when the third sound insulating section 21 is directly connected to the ventilation section 34). Furthermore, the distance L may be set according to the frequency characteristics (e.g., the peak frequency of the noise) of the noise generated in the ventilation device 40. This further improves the sound insulation performance of the sound insulating structure.

[0096] (6) Other Modifications In the above-described embodiment, the first sound insulating part 11 and the third sound insulating part 21 have a cylindrical shape, but the scope of the first and second embodiments is not limited to this. The above-described embodiment can also be applied to an example in which the first sound insulating part 11 and the third sound insulating part 21 have a shape other than a cylindrical shape (for example, a rectangular pillar).

[0097] In the first modification, an example in which the second sound insulating part 12 has a cylindrical shape has been shown, but the scope of the first modification is not limited to this. The first modification can also be applied to an example in which the second sound insulating part 12 has a shape other than a cylindrical shape (for example, a rectangular prism).

[0098] Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited to the above-described embodiments. Furthermore, the above-described embodiments can be improved or modified in various ways without departing from the spirit of the present invention. Furthermore, the above-described embodiments and modifications can be combined.

[0099] <Supplementary Note 1> The matters described in the first embodiment above will be supplemented below.

[0100] [Supplementary Note 1-1] A sound-insulating structure comprising an outer peripheral member having a first hollow region extending in a first direction, wherein the outer peripheral member has: a first opening formed in an inner surface of the outer peripheral member; and a first resonance space formed in an inner portion of the outer peripheral member and communicating with the first opening. [Supplementary Note 1-2] The sound-insulating structure according to Supplementary Note 1, comprising a second sound-insulating part disposed in the first hollow region, wherein the second sound-insulating part has: a second slit formed in the outer peripheral surface of the second sound-insulating part and opening in the second direction, and a second resonance space formed inside the second sound-insulating part and communicating with the second slit. [Supplementary Note 1-3] The sound-insulating structure according to Supplementary Note 2, wherein the second sound-insulating part has a second sound-insulating characteristic that is different from the first sound-insulating characteristic of the outer peripheral member. [Supplementary Note 1-4] The sound-insulating structure according to Supplementary Note 2, wherein the first hollow region is cylindrical, and the second sound-insulating part is cylindrical. [Appendix 1-5] A sound-insulating structure according to any one of Appendices 1 to 4, wherein the first hollow region is cylindrical. [Appendix 1-6] A sound-insulating structure comprising a sound-insulating part having a first hollow region extending in a first direction, wherein the sound-insulating part comprises a pair of first openings connected to the first hollow region, and a pair of second openings connected to the second hollow region. [Appendix 1-7] A blower comprising the sound-insulating structure according to any one of Appendices 1 to 4. [Appendix 1-8] A duct comprising the sound-insulating structure according to any one of Appendices 1 to 4. [Appendix 1-9] A workspace comprising the sound-insulating structure according to any one of Appendices 1 to 4. [Appendix 1-10] A window sash comprising the sound-insulating structure according to any one of Appendices 1 to 4. [Appendix 1-11] A conference room comprising the sound-insulating structure according to any one of Appendices 1 to 4. [Appendix 1-12] A pulverizer comprising the sound-insulating structure according to any one of Appendices 1 to 4. [Appendix 1-13] A dryer comprising the sound-insulating structure according to any one of Appendices 1 to 4. [Appendix 1-14] A cable cover comprising the sound-insulating structure according to any one of Appendices 1 to 4.

[0101] <Supplementary Note 2> The matters described in the second embodiment above will be supplemented below.

[0102] [Supplementary Note 2-1] A sound-insulating structure comprising a cylindrical member open at both ends, the cylindrical member comprising: a first opening formed on the inner surface; and a first resonance space formed between the inner surface and the outer surface, the first opening communicating with the first resonance space. [Supplementary Note 2-2] The sound-insulating structure according to Supplementary Note 1, wherein the first opening is circular. [Supplementary Note 2-3] The sound-insulating structure according to Supplementary Note 1, wherein the first opening is a slit extending in the circumferential direction of the cylindrical member. [Supplementary Note 2-4] The sound-insulating structure according to Supplementary Note 1, wherein the cylindrical member comprises: a plurality of openings formed in a row along the circumferential direction of the inner surface; and a plurality of resonance spaces formed between the inner surface and the outer surface and isolated by partitions, each of the plurality of openings communicating with at least one of the plurality of resonance spaces, the plurality of resonance spaces having different volumes. [Supplementary Note 2-5] The sound-insulating structure according to Supplementary Note 4, wherein the resonance space with the largest volume and the resonance space with the smallest volume among the plurality of resonance spaces are arranged adjacent to each other. [Supplementary Note 2-6] The sound-insulating structure according to Supplementary Note 4, wherein the partition is a member formed in the radial direction of the cylindrical member and divides the interior of the cylindrical member into a plurality of resonance spaces. [Supplementary Note 2-7] The sound-insulating structure according to Supplementary Note 4, wherein the plurality of openings and the plurality of resonance spaces are arranged line-symmetrically when viewed from the central axis direction of the cylindrical member. [Supplementary Note 2-8] A ventilation device comprising a ventilation part through which gas can pass and the sound-insulating structure according to any one of Supplements 1 to 7, wherein the sound-insulating structure is arranged so that the gas flowing through the ventilation part passes through a hollow space inside the cylindrical member. [Supplementary Note 2-9] The ventilation device according to Supplementary Note 8, wherein a spacer capable of adjusting the distance from the sound source to the first opening in the ventilation device is provided between the ventilation part and the cylindrical member. [Supplementary Note 2-10] The ventilation device according to Supplementary Note 8, wherein the resonance frequency of the first resonance space is substantially the same as the peak frequency of sound generated in the ventilation device. [Supplementary Note 2-11] The sound-insulating structure according to Supplementary Note 1, further comprising: a second sound-insulating part disposed inside the inner surface of the cylindrical member, the second sound-insulating part comprising: a second opening part formed on an outer surface of the second sound-insulating part facing the inner surface of the cylindrical member; and a second resonance space formed inside the second sound-insulating part, the second opening part being in communication with the second resonance space, and the volume of the first resonance space being different from the volume of the second resonance space.[Appendix 2-12] The sound-insulating structure according to appendix 11, wherein the tubular member has a cylindrical shape, and the second sound-insulating portion has a cylindrical shape.

[0103] 10: Sound insulating structure 11: First sound insulating part 111: First opening 112: First resonance space 13: Cylindrical part 14a, 14b: First opening 15a, 15b: Second opening 20: Sound insulating structure 21: Third sound insulating part 211: Opening 212: Resonance space 22: Sound insulating part 221: Opening 222: Resonance space 23: Sound insulating part 231: Opening 232: Resonance space

Claims

1. A sound-insulating structure comprising a cylindrical member having both ends open, the cylindrical member having a first opening formed on its inner surface and a first resonance space formed between its inner surface and outer surface, the first opening communicating with the first resonance space.

2. The sound insulating structure according to claim 1, wherein the first opening is circular.

3. The sound-insulating structure according to claim 1, wherein the first opening is a slit extending in the circumferential direction of the cylindrical member.

4. A sound-proofing structure according to claim 1, wherein the cylindrical member comprises a plurality of openings formed in a row along the circumferential direction of the inner surface, and a plurality of resonance spaces formed between the inner surface and the outer surface and isolated by partitions, each of the plurality of openings communicating with at least one of the plurality of resonance spaces, and the volumes of the plurality of resonance spaces differ from one another.

5. The sound-insulating structure according to claim 4, wherein the resonance space with the largest volume and the resonance space with the smallest volume among the plurality of resonance spaces are arranged adjacent to each other.

6. The sound-insulating structure according to claim 4, wherein the partition is a member formed in the radial direction of the cylindrical member and divides the interior of the cylindrical member into a plurality of resonance spaces.

7. The sound-proofing structure according to claim 4, wherein the plurality of openings and the plurality of resonance spaces are arranged symmetrically when viewed from the central axis direction of the cylindrical member.

8. A ventilation device comprising a ventilation section through which gas can pass and a sound-insulating structure according to any one of claims 1 to 7, wherein the sound-insulating structure is arranged so that gas flowing through the ventilation section passes through a hollow region inside the tubular member.

9. The ventilation device according to claim 8, wherein a spacer capable of adjusting the distance from the sound source in the ventilation device to the first opening is provided between the ventilation part and the tubular member.

10. The ventilation device according to claim 8, wherein the resonance frequency of the first resonance space is substantially the same as the peak frequency of the sound generated in the ventilation device.

11. A sound-insulating structure as described in claim 1, further comprising a second sound-insulating part disposed inside the inner surface of the cylindrical member, the second sound-insulating part comprising: a second opening formed on an outer surface of the second sound-insulating part facing the inner surface of the cylindrical member; and a second resonance space formed inside the second sound-insulating part, the second opening communicating with the second resonance space, and the volume of the first resonance space being different from the volume of the second resonance space.

12. The sound-insulating structure according to claim 11, wherein the tubular member has a cylindrical shape, and the second sound-insulating portion has a cylindrical shape.

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