Sound absorption body

Abstract

To provide a sound absorption body that improves flame resistance and suppresses deterioration in workability during installation.SOLUTION: The sound absorption body comprises a sound absorption material and a protective plate made of metal or flame-resistant plastic. The protective plate covers at least one surface of the sound absorption material and has V-shaped grooves extending from one end to the other.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a sound absorbing body that is attached to a pipe and suppresses noise emission to the outside. [Background technology]

[0002] When a fluid flows through a pipe, noise may be generated from the pipe. For example, a refrigeration cycle device such as an air conditioner includes a refrigerant circuit in which a refrigerant circulates. This refrigerant circuit is configured by connecting a compressor, a condenser, an expansion device, and an evaporator in a ring shape with refrigerant piping. When the refrigeration cycle device is in operation, noise may be generated from the refrigerant piping due to vibration of the refrigerant flowing through the refrigerant piping. In addition, if the noise generated from the piping is heard in the living space, the comfort of the living space decreases. For this reason, when noise is generated from the piping after the installation of the piping, a sound absorbing material is wrapped around the piping part where the noise is generated, to suppress the noise from being released to the outside. As a sound absorbing material to be wrapped around a pipe, for example, a sound absorbing material having a sound absorbing layer and a sound insulating layer as described in Patent Document 1 is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-314781 A Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, the sound absorbing material used in the sound absorber is made of a flammable material such as a nonwoven fabric or a resin. Therefore, when the sound absorber is attached to the piping of an apparatus installed outdoors, such as an outdoor unit of an air conditioner, if the sound absorber is ignited by a fire used outdoors, the sound absorber may burn. Therefore, a sound absorber having flame retardancy is required. Here, in the sound absorber of Patent Document 1, it is possible to improve the flame retardancy by increasing the thickness of the layer made of aluminum foil. However, in this case, the workability when attaching to the piping is reduced.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a sound-absorbing body that improves flame retardancy and suppresses a decrease in workability during installation. [Means for solving the problem]

[0006] The sound-absorbing body according to the present disclosure comprises a sound-absorbing material and a protective plate covering at least one side of the sound-absorbing material and made of metal or flame-retardant plastic, the protective plate having a V-shaped groove extending from one end to the other end. Effect of the Invention

[0007] According to the present disclosure, by providing a protective plate made of metal or flame-retardant plastic and having a V-shaped groove, it is possible to improve the flame retardancy of the sound-absorbing body while suppressing a decrease in workability during installation. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a sound absorber according to a first embodiment. [Diagram 2] 1 is a schematic cross-sectional view of a sound absorber according to a first embodiment. FIG. [Diagram 3] FIG. 2 is a diagram showing an example of a state in which the sound absorbing body according to the first embodiment is attached to a pipe. [Figure 4] FIG. 4 is a diagram showing another example of a state in which the sound absorbing body according to the first embodiment is attached to a pipe. [Diagram 5] 1 is a schematic cross-sectional view of a sound absorber according to a first embodiment attached to a pipe. FIG. [Figure 6] FIG. 11 is a perspective view of a sound absorber according to a second embodiment. [Figure 7] FIG. 11 is a schematic cross-sectional view of a sound absorber according to a second embodiment. [Figure 8] FIG. 4 is a schematic cross-sectional view of a sound absorber according to a first modified example. [Figure 9] FIG. 11 is a perspective view of a sound absorber according to Modification 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of a sound absorber 1 according to the present disclosure will be described with reference to the drawings. In each drawing, components with the same reference numerals are the same or equivalent components, and this is common throughout the entire specification. Note that in each drawing, the relative dimensional relationship or shape of each component may differ from the actual one. In each drawing, the direction from the right side to the left side is defined as the X direction, the direction from the bottom side to the top side is defined as the Y direction, and the direction from the front side to the rear side is defined as the Z direction, but each direction is defined for the purpose of explanation and does not limit the direction of each component.

[0010] Embodiment 1 FIG. 1 is a perspective view of a sound absorber 1 according to the first embodiment. FIG. 2 is a schematic cross-sectional view of the sound absorber 1 according to the first embodiment. FIG. 2 shows a schematic view of a part of a cross section of the sound absorber 1 cut in the XY plane. As shown in FIGS. 1 and 2, the sound absorber 1 according to the first embodiment has a rectangular flat plate shape when viewed from above. The sound absorber 1 includes a sound absorbing material 11, an outer protective plate 12o that covers the front surface of the sound absorbing material 11, and an inner protective plate 12i that covers the rear surface of the sound absorbing material 11. The sound absorbing material 11, the outer protective plate 12o, and the inner protective plate 12i are bonded to each other with an adhesive or tape.

[0011] The sound absorbing material 11 is formed in a substantially rectangular flat plate shape. The sound absorbing material 11 has a thickness Ts of, for example, 5 mm to several tens of mm. The sound absorbing material 11 is made of a nonwoven material such as cotton or hemp, pulp-based fiber, silicon-based fiber, a combination of these fibers, resin, rubber, felt, or the like. As an example, the sound absorbing material 11 is made by kneading a base mainly made of pulp fiber with silicon-based fiber mainly made of silicon material. Pulp fiber does not hydrolyze even when water adheres to it. Therefore, by using a material containing pulp fiber for the sound absorbing material 11, it is possible to suppress the deterioration of sound absorbing performance even when the sound absorber 1 is placed in an environment where water adheres, compared to a case where a hydrolyzable material is used for the sound absorbing material 11. Note that, although a configuration in which the sound absorber 1 has a single layer of sound absorbing material 11 is shown in FIG. 1 and FIG. 2, the sound absorber 1 may have a plurality of layers of sound absorbing material 11.

[0012] The outer protective plate 12o and the inner protective plate 12i are plate-shaped members that protect the sound-absorbing material 11, and are made of metal or flame-retardant plastic. Specifically, the outer protective plate 12o and the inner protective plate 12i are made of a stainless steel plate, an aluminum plate, or a plastic with a flame-retardant grade of V0 according to the UL94 standard. The thickness To of the outer protective plate 12o and the thickness Ti of the inner protective plate 12i are, for example, 0.1 mm or more.

[0013] The outer protective plate 12o has an area equal to or larger than the surface of the sound absorbing material 11, and is bonded to the sound absorbing material 11 so as to cover the surface of the sound absorbing material 11. The outer protective plate 12o is disposed on the outer side, i.e., on the side that does not contact the pipe 100, when the sound absorber 1 is attached to the pipe 100 (FIG. 4). As shown in FIG. 2, a plurality of V-shaped grooves 13o are formed on the surface of the outer protective plate 12o that contacts the surface of the sound absorbing material 11. The plurality of grooves 13o are disposed at equal intervals in the X direction and extend from one end to the other end of the outer protective plate 12o in the Z direction. The intervals between the plurality of V-shaped grooves 13o are, for example, 10 mm to 100 mm, and the depth of each groove 13o is equal to or less than half the thickness To of the outer protective plate 12o. The opening width δo of each groove 13o is set so that the sum Mo of the opening widths δo of the plurality of grooves 13o provided in the outer protective plate 12o satisfies the following formula (1). Here, θ is the angle at which the outer protective plate 12o is bent (FIG. 5). Mo≦To × θ / (2π) (1)

[0014] The inner protective plate 12i has an area equal to or larger than the rear surface of the sound absorbing material 11, and is bonded to the sound absorbing material 11 so as to cover the rear surface of the sound absorbing material 11. The inner protective plate 12i is disposed on the inside, i.e., on the side that contacts the pipe 100, when the sound absorber 1 is attached to the pipe 100 (FIG. 4). As shown in FIG. 2, a plurality of V-shaped grooves 13i are formed on the surface of the inner protective plate 12i that does not contact the rear surface of the sound absorbing material 11. The plurality of grooves 13i are disposed at equal intervals in the X direction, and extend from one end to the other end of the inner protective plate 12i in the Z direction. The intervals between the plurality of V-shaped grooves 13i are, for example, 10 mm to 100 mm, and the depth of each groove 13i is half or less of the thickness Ti of the inner protective plate 12i. The opening width δi of each groove 13i is set so that the sum Mi of the opening widths δi of the multiple grooves 13i provided in the inner protective plate 12i satisfies the following formula (2), where θ is the angle at which the inner protective plate 12i is bent (FIG. 5). Mi ≦ Ti × θ / (2π) (2)

[0015] The material of the outer protective plate 12o and the material of the inner protective plate 12i may be the same or different. For example, both the outer protective plate 12o and the inner protective plate 12i may be made of metal, or the outer protective plate 12o may be made of metal and the inner protective plate 12i may be made of plastic having flame retardancy. By making the inner protective plate 12i in contact with the pipe 100 from plastic, it is possible to prevent contact between metals. In addition, the number, interval, depth, and opening width of the grooves 13o of the outer protective plate 12o and the grooves 13i of the inner protective plate 12i may be the same or different. For example, when the outer protective plate 12o is made of metal and the inner protective plate 12i is made of plastic, the thickness Ti of the inner protective plate 12i is thicker than the thickness To of the outer protective plate 12o in order to ensure flame retardancy. As a result, the opening width δi of the groove 13i of the inner protective plate 12i is larger than the opening width δo of the groove 13o of the outer protective plate 12o.

[0016] FIG. 3 is a diagram showing an example of a state in which the sound absorber 1 according to the first embodiment is attached to the pipe 100. FIG. 4 is a diagram showing another example of a state in which the sound absorber 1 according to the first embodiment is attached to the pipe 100. The sound absorber 1 is attached by an operator to a portion of the pipe 100 where noise is generated, and is fixed by a fixing means such as a cable tie 5. The sound absorber 1 may be attached so as to cover the entire circumference of the U-shaped pipe 100 as shown in FIG. 3, or may be attached so as to cover only a specific part of the circumference of the U-shaped pipe 100 as shown in FIG. 4. The means for fixing the sound absorber 1 to the pipe 100 is not limited to the cable tie 5, and the sound absorber 1 may be fixed to the pipe 100 by double-sided tape, adhesive, or the like.

[0017] The piping 100 is a component for which noise countermeasures are taken using the sound absorber 1, and is, for example, a refrigerant piping through which a refrigerant flows. In more detail, refrigeration cycle devices such as air conditioners, refrigerators, freezers, vending machines, and water heaters are equipped with a refrigerant circuit through which a refrigerant circulates. This refrigerant circuit is configured such that a compressor, a condenser, an expansion device, and an evaporator are connected in a ring shape by refrigerant piping. The piping 100 is, for example, a refrigerant piping that connects a compressor, a condenser, an expansion device, and an evaporator in a ring shape. Note that the piping 100 may be a piping through which a fluid other than a refrigerant flows.

[0018] FIG. 5 is a schematic cross-sectional view of the sound absorber 1 according to the first embodiment attached to the pipe 100. FIG. 5 is a schematic cross-sectional view of the sound absorber 1 according to the first embodiment attached to the pipe 100, cut along the XY plane. When an operator attaches the sound absorber 1 to the pipe 100, the operator bends the sound absorber 1 along the outer periphery of the pipe 100 to wrap the sound absorber 1 around the outer periphery of the pipe 100. Here, metal or plastic plates such as the outer protective plate 12o and the inner protective plate 12i have high rigidity and are difficult to deform. In addition, even after being deformed, the metal or plastic plate tends to return to its original flat shape due to a restoring force. This reduces the workability when attaching the sound absorber 1 to the pipe 100.

[0019] In contrast, the outer protective plate 12o and the inner protective plate 12i of the sound absorber 1 of this embodiment are provided with a plurality of V-shaped grooves 13o and 13i. This makes it easier to bend the sound absorber 1, and the restoring force after bending is also reduced, so that the workability when attaching the sound absorber 1 is suppressed from decreasing. In addition, as shown in FIG. 5, by bending the sound absorber 1, the outer protective plate 12o and the inner protective plate 12i are deformed, and the plurality of V-shaped grooves 13o and 13i are closed. This makes the thickness of the outer protective plate 12o and the inner protective plate 12i of the sound absorber 1 attached to the pipe 100 uniform. In other words, the plurality of V-shaped grooves 13o and 13i of the outer protective plate 12o and the inner protective plate 12i are closed after deformation, so that the provision of the grooves 13o and 13i does not cause a decrease in flame retardancy due to a local thinning of the plate thickness.

[0020] As described above, the sound absorber 1 of this embodiment is flame retardant, and is configured to cover the sound absorbing material 11 with the outer protective plate 12o and the inner protective plate 12i provided with a plurality of V-shaped grooves 13o and 13i. This improves the flame retardancy of the sound absorber 1, and can prevent a decrease in workability when attaching the sound absorber 1 to the piping 100. Furthermore, by using metal for the outer protective plate 12o and the inner protective plate 12i, corrosion resistance is improved, and in particular, even when the sound absorber 1 is attached to the piping 100 of an apparatus installed outdoors and is splashed with water due to precipitation, etc., decay of the sound absorbing material 11 can be prevented.

[0021] Embodiment 2 A sound absorber 1A according to a second embodiment will be described. FIG. 6 is a perspective view of the sound absorber 1A according to the second embodiment. FIG. 7 is a schematic cross-sectional view of the sound absorber 1A according to the second embodiment. FIG. 7 shows a schematic partial cross-section of the sound absorber 1A cut along the XY plane. The sound absorber 1A according to the present embodiment includes a sound absorbing material 11, an outer protective plate 12o, and an inner protective plate 12i, similar to the first embodiment. The materials and configurations of the sound absorbing material 11, the outer protective plate 12o, and the inner protective plate 12i are the same as those of the first embodiment.

[0022] The pipe 100 to which the sound absorber 1A is attached may receive vibrations from a vibration source (such as a compressor, etc.), which may generate noise due to the vibrations. In particular, vibrations at a resonance frequency according to the shape or mass of the pipe 100 become noticeable. In this case, the resonance frequency can be changed by the mass of the sound absorber 1 attached to the pipe 100, and vibrations can be countered by making the pipe non-resonant. Therefore, the sound absorber 1A of this embodiment is configured to be separable so that the mass corresponds to the natural vibration of the pipe 100.

[0023] More specifically, as shown in Fig. 6 and Fig. 7, in the sound absorber 1A of the present embodiment, the sound absorbing material 11, the outer protective plate 12o, and the inner protective plate 12i are divided into a plurality of blocks 10 and can be cut apart. A plurality of blocks 10 are arranged side by side in the X direction and a plurality of blocks 10 are arranged side by side in the Y direction. As shown in Fig. 7, in each block 10, the outer protective plate 12o and the inner protective plate 12i cover the divided sound absorbing material 11 so as to hermetically seal it.

[0024] The blocks 10 are connected to each other by outer protective plates 12o and inner protective plates 12i, and cutouts 14 for separating the blocks 10 are provided between the blocks 10. The cutouts 14 are, for example, notches provided in the outer protective plates 12o and inner protective plates 12i between the blocks 10. Alternatively, the cutouts 14 between the blocks 10 may be formed of micro joints. An operator can cut out any number of blocks 10 by cutting the cutouts 14 with a tool such as nippers.

[0025] Each block 10 is provided with a display unit 15 that indicates an index for dividing each block 10. For example, in the example of Fig. 6, the mass of each block 10, "50g", is displayed on the display unit 15. This makes it easy to know the mass of the sound-absorbing material 11 to be placed when attaching the block 10 to the pipe 100.

[0026] As described above, the sound absorber 1A of this embodiment, like the first embodiment, has improved flame retardancy and can suppress a decrease in workability when mounting the sound absorber 1A on the pipe 100. Furthermore, by configuring the sound absorber 1A to be divisible, when a market complaint or the like occurs, the sound absorber 1A of a mass required to make the vibration of the pipe 100 non-resonant with the vibration of the noise can be mounted on-site. This makes it possible to easily suppress the noise caused by the resonant vibration of the pipe 100. Furthermore, by sealing the sound absorbing material 11 with the outer protective plate 12o and the inner protective plate 12i in each block 10, the flame retardancy and corrosion resistance of the sound absorber 1A are further improved, and the release of the vibration sound of the pipe 100 to the outside is suppressed, thereby further reducing noise.

[0027] The indicators displayed on display unit 15 of sound absorber 1A are not limited to the mass of each block 10, but may be anything that encourages the worker to make the appropriate cut. For example, display unit 15 may display multiple blocks 10 collectively as "for U-shaped piping" or "for I-shaped piping," or other indications that indicate the type of piping 100 and the number of blocks 10. Sound absorber 1A is configured to be cut in two directions, but may be cut in only one direction.

[0028] The above is an explanation of the embodiment, but the present disclosure is not limited to the above embodiment and can be modified in various ways without departing from the gist of the present disclosure. In addition, the present disclosure includes all combinations of the configurations shown in the above embodiment that can be combined. For example, in the above embodiment, both sides of the sound absorbing material 11 are covered with the outer protective plate 12o and the inner protective plate 12i, but the inner protective plate 12i may be omitted. In this case, the outer surface of the sound absorber 1A when attached to the pipe 100 is protected by the outer protective plate 12o, thereby improving the flame retardancy compared to the conventional technology.

[0029] Alternatively, the entire surface of the sound absorbing material 11 may be covered with a protective plate. FIG. 8 is a schematic cross-sectional view of a sound absorber 1B according to the first modification. As shown in FIG. 8, the sound absorber 1B may include a side protective plate 12s that covers all the side surfaces of the sound absorbing material 11 in addition to an outer protective plate 12o and an inner protective plate 12i that cover the front and back surfaces of the sound absorbing material 11, respectively. That is, the sound absorbing material 11 may be sealed by the outer protective plate 12o, the inner protective plate 12i, and the side protective plate 12s. In this case, as shown in FIG. 8, the outer protective plate 12o, the inner protective plate 12i, and a part of the side protective plate 12s may be made of an integrated metal plate or plastic plate. This can further improve the flame retardancy and corrosion resistance of the sound absorber 1B, and suppress the vibration sound of the pipe 100 from being released to the outside, thereby further reducing noise.

[0030] Moreover, the grooves formed in the outer protective plate 12o and the inner protective plate 12i are not limited to the examples of the above embodiment. FIG. 9 is a perspective view of the sound absorber 1C according to the second modification. FIG. 9 shows the sound absorber 1C viewed from the inner protective plate 12i side. In the above embodiment, the outer protective plate 12o and the inner protective plate 12i are provided with the grooves 13o and 13i extending from one end to the other end in the Z direction. This configuration makes it easier for the sound absorber 1 to bend along the outer periphery of the pipe 100. Here, as shown in FIG. 3 and FIG. 4, when the sound absorber 1C is attached to the U-shaped portion of the pipe 100, the sound absorber 1C is bent in two directions, that is, in a direction along the outer periphery of the pipe 100 and in a direction along the U-shape. 9, grooves 13o and 13i (first grooves) extending from one end to the other end in the Z direction (first direction) and grooves 16o and 16i (second grooves) extending from one end to the other end in the X direction (second direction) perpendicular to the Z direction may be provided on the outer protective plate 12o and the inner protective plate 12i. By providing the outer protective plate 12o and the inner protective plate 12i with a plurality of grooves 13o and 13i extending in the Z direction, as well as a plurality of grooves 16o and 16i extending in the X direction, it is possible to suppress a decrease in workability even when the sound absorber 1C is bent in two directions.

[0031] Furthermore, the number of grooves 13o and grooves 16o provided on the outer protective plate 12o, and the number of grooves 13i and grooves 16i provided on the inner protective plate 12i are not limited to multiple, but are set appropriately depending on the size of the sound absorber 1, etc., and it is sufficient that there is at least one of each.

[0032] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) Sound absorbing material; A protective plate that covers at least one surface of the sound-absorbing material and is made of metal or flame-retardant plastic, The sound absorber has a V-shaped groove in the protective plate that extends from one end to the other end. (Appendix 2) The protective plate is An outer protective plate that covers the surface of the sound absorbing material; An inner protective plate that covers the back surface of the sound-absorbing material, 2. The sound absorber according to claim 1, wherein the grooves are provided on a surface of the outer protective plate that contacts the front surface of the sound absorbing material, and on a surface of the inner protective plate that does not contact the back surface of the sound absorbing material. (Appendix 3) 3. The sound absorber according to claim 2, wherein the outer protective plate is made of the metal and the inner protective plate is made of the plastic. (Appendix 4) 4. The sound absorber according to claim 1, wherein the protective plate has a thickness of 0.1 mm or more. (Appendix 5) The sound absorbing material and the protective plate are divided into a plurality of severable blocks, 5. The sound absorber according to claim 1, wherein in each block, the protective plate seals the sound absorbing material. (Appendix 6) 6. The sound absorbing body according to claim 5, wherein the plurality of blocks are provided with an indicator that indicates an index for dividing the plurality of blocks. (Appendix 7) The sound absorber according to claim 2 or 3, wherein the protective plate comprises the outer protective plate, the inner protective plate, and a side protective plate that covers the side surface of the sound absorbing material. (Appendix 8) 8. The sound absorber according to claim 1, wherein the grooves include a first groove extending in a first direction and a second groove extending in a second direction perpendicular to the first direction. [Explanation of symbols]

[0033] 1, 1A, 1B, 1C sound absorber, 5 cable tie, 10 block, 11 sound absorber, 12i inner protection plate, 12o outer protection plate, 12s side protection plate, 13i, 13o, 16i, 16o groove, 14 cutout, 15 display, 100 piping.

Claims

1. Sound absorbing material; A protective plate that covers at least one surface of the sound-absorbing material and is made of metal or flame-retardant plastic, The sound absorber has a V-shaped groove extending from one end to the other end of the protective plate.

2. The protective plate is An outer protective plate that covers the surface of the sound absorbing material; An inner protective plate that covers the back surface of the sound-absorbing material, 2. The sound absorber according to claim 1, wherein the grooves are provided on a surface of the outer protective plate that contacts the front surface of the sound absorbing material, and on a surface of the inner protective plate that does not contact the back surface of the sound absorbing material.

3. 3. The sound absorber according to claim 2, wherein the outer protective plate is made of the metal, and the inner protective plate is made of the plastic.

4. The sound absorber according to any one of claims 1 to 3, wherein the protective plate has a thickness of 0.1 mm or more.

5. The sound absorbing material and the protective plate are divided into a plurality of severable blocks, 4. The sound absorber according to claim 1, wherein in each of the blocks, the protective plate seals the sound absorbing material.

6. The sound absorber according to claim 5 , wherein the plurality of blocks are provided with an indication portion that indicates an index for dividing the plurality of blocks.

7. 4. The sound absorber according to claim 2, wherein the protective plates comprise the outer protective plate, the inner protective plate, and side protective plates that cover the side surfaces of the sound absorbing material.

8. The sound absorber according to any one of claims 1 to 3, wherein the grooves include a first groove extending in a first direction and a second groove extending in a second direction perpendicular to the first direction.

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