JP2015176017A - sound insulation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound insulation structure not depending on an area of a sound insulation object with a simple configuration and light in weight and thin in thickness.SOLUTION: A sound insulation structure in the present invention insulates propagation of a sound from a first surface to a second surface. The sound insulation structure includes: a frame having a first surface part of a first surface side and a second surface part of a second surface formed with a plurality of through-holes inside the outer edge of a center region; a connection member connecting the first surface part and the second surface part inside the center region; and a flexible film for forming an airtight space by partitioning a space between the first surface part and the second surface part from an external space. With the airtight space pressurized by a pressure higher than an atmospheric pressure, the film is protruded in a curved manner to the outside from the airtight space from the through-holes of the first surface and the second surface, and the film making a pressurized state in which a stress is applied can insulate the transmission of the sound.

Description

  The present invention relates to a sound insulation structure. More specifically, the present invention relates to a sound insulation structure that obtains excellent sound insulation by applying tension to a thin film.

  In general, the sound insulation structure is configured based on the mass law and the rigidity side. The mass rule is that the greater the surface density, which is the mass per unit area of the sound insulation structure, the higher the sound insulation effect. This is because a sound insulation structure having a higher surface density has a higher transmission loss when passing through the sound insulation structure. On the other hand, the rigidity law is that the higher the rigidity of the sound insulation structure, the higher the sound insulation effect. Here, the rigidity law is an idea for low-frequency sound, and the mass law is considered to be dominant in most of the audible frequency range.

  Therefore, the sound insulation structure for the purpose of sound insulation in a normal audible frequency region is designed to increase the sound insulation effect by increasing the surface density of the sound insulation structure according to the mass law. However, in order to increase the sound insulation effect by the mass law, it is necessary to increase the thickness of the sound insulation structure, so that there is a problem that the sound insulation structure becomes large and heavy.

  For such a problem, Patent Document 1 describes a sound insulation structure in which a bag-like thin film is sandwiched by a frame having a plurality of openings from both sides. And it is supposed that a sound insulation effect can be obtained by applying tension to the film by filling the bag-like film with air until the film protrudes into the opening of the frame. Thereby, it is supposed that it can be set as the sound insulation structure of a lightweight and cheap structure.

  However, the sound insulation structure described in Patent Document 1 has a configuration in which a bag-like film is sandwiched between frames from both sides, and the frames are fixed only at their outer edges. For this reason, in the vicinity of the center of the frame body, the frame bodies are deformed so as to move away from each other due to the pressing force when air is filled in the bag-like film. The amount of deformation near the center of the frame increases as the area of the sound insulation structure increases, compared to the outer edge. This is because the greater the area of the sound insulation structure, the greater the distance from the fixed outer edge near the center of the frame. Such deformation near the center can be reduced, for example, by increasing the strength of the frame. However, in order to increase the strength, the sound insulation structure as a whole becomes large and heavy, which is not preferable.

  Therefore, as described in Patent Document 2, the sound insulation structure having the structure as in Patent Document 1 is used as one structural unit, and a plurality of the sound insulation structures are arranged in the same plane, thereby increasing the sound insulation area. Conceivable. This is because the area per one sound insulation structure unit as a structural unit is small. For this reason, the frame body does not need high strength, and the sound insulation structure as a whole is not large and heavy.

JP 2012-122236 A JP 2013-195729 A

  However, in a sound insulation structure composed of a plurality of sound insulation structure units, as the area of the sound insulation object increases, more sound insulation component units are required. As a result, the overall structure of the sound insulation structure becomes complicated. In addition, in the case of performing sound insulation by applying tension to the film, the transmission loss can be made different by adjusting the tension applied to the film. However, a sound insulation structure composed of a plurality of sound insulation structures has a problem that it is not easy to adjust the overall transmission loss. That is, in order to adjust the transmission loss of the entire sound insulation structure, it is necessary to individually adjust the pressure of the plurality of sound insulation structures. For this reason, it is necessary to provide a pressure adjusting unit for adjusting the pressure individually for each of the plurality of sound insulating structure units, or to connect all the sound insulating structure units to the pressure adjusting unit by piping.

  The present invention has been made for the purpose of solving the problems of the prior art described above. That is, the subject is to provide a sound insulation structure that has a simple configuration, is lightweight, and has a small thickness regardless of the area of the sound insulation object.

  The sound insulation structure of the present invention made for the purpose of solving this problem has a first surface and a second surface opposite to the first surface, and transmits sound from the first surface to the second surface. A sound insulation structure for blocking, having a first surface portion located on the first surface side, and a second surface portion located on the second surface side and spaced from the first surface portion, A connection in which a plurality of through-holes are formed in the central region inside the outer edge on both the second surface portion and the first surface portion and the second surface portion of the frame are connected in the central region. A flexible film positioned between the member and the first surface portion and the second surface portion and defining a space between the first surface portion and the second surface portion from an external space to form a sealed space; , And a pressure maintaining part for maintaining the sealed space at a pressure higher than atmospheric pressure, and the film is formed by pressurizing the sealed space to a pressure higher than atmospheric pressure. The transmission of sound is blocked by taking a pressurized state in which the film is tensioned while projecting in a curved shape from the sealed space to the outside through the through holes of the first surface portion and the second surface portion. It is a sound insulation structure.

  The sound insulation structure of the present invention can take a sound insulation state by placing the sealed space in a pressurized state and applying tension to the film. The film is a thin film, and the frame and the connecting member only need to be rigid enough to support the tension of the film. For this reason, it is lightweight and thin. In addition, the connection member can suppress the deformation of the frame in the central region inside the outer edge. Therefore, even if the areas of the first surface and the second surface are large, deformation of the frame can be suppressed with a simple configuration.

  In the sound insulation structure described above, the film is preferably bag-shaped. This is because there is no need to fix the frame and the film.

  In the sound insulation structure described above, the film is preferably provided with an annular portion that surrounds the connecting member and is formed by connecting the first surface side and the second surface side of the film. This is because it is not necessary to seal the portion through which the connection member of the film is passed.

  In the sound insulation structure described above, the film has an elongated tube shape, and a turn portion that is bent or curved in a plane not orthogonal to the first surface is provided between one end and the other end of the film. The connecting member is such that one end side and the other end side of the film are connected to each other between the sections adjacent to each other through the turn portion, and the first surface portion and the second surface portion are connected. preferable. This is because the shape of the film can be simplified.

  Further, in the sound insulation structure described above, the film has two or more branched branches, and the connecting member connects the first surface and the second surface through the branches. It is preferable that This is because the shape of the film can be simplified.

  In the sound insulation structure described above, it is preferable that the film is in a state of being pressed by the connecting member in a pressurized state. When the film is pressed against the connecting member in the pressurized state, there is no gap between them, and the film is in close contact. For this reason, it is because the transmittance | permeability of the incident sound in a sound insulation state can be reduced.

  In the sound insulation structure described above, the connection member may penetrate the film and connect the first surface portion and the second surface portion through the sealed space. This is because there is no possibility of sound passing through the gap due to the absence of the gap between the connecting member and the film.

  In the sound insulation structure described above, the connecting member is preferably made of a material having viscoelasticity. This is because transmission of sound in the connecting member can be reduced and transmission loss can be increased.

  In the sound insulation structure described above, the pressure maintaining unit has a pressure adjusting unit that adjusts the pressure in the sealed space by moving air between the sealed space and the outside, and is sealed from the outside by the pressure adjusting unit. It can take a pressurized state when air is sucked into the space, and can take a pressure released state where the pressurized state is released when air is discharged from the sealed space to the outside by the pressure adjusting unit. It is preferable. This is because the transmission loss can be adjusted by the pressure in the sealed space.

  In the sound insulation structure described above, it is preferable that at least the film in the group consisting of a film, a frame, and a connection member is transparent or translucent. This is because the visibility on the other surface side from the one surface side of the first surface and the second surface can be ensured.

  According to the present invention, there is provided a sound insulation structure that has a simple configuration and is light and thin regardless of the area of the sound insulation object.

It is sectional drawing of the sound insulation structure which concerns on a 1st form. It is a front view of the sound insulation structure concerning a 1st form. It is sectional drawing in the pressurization state of the sound insulation structure which concerns on a 1st form. It is a graph for demonstrating the relationship between the pressure of sealed space, and transmission loss. It is a figure for demonstrating the 1st modification of a bag-shaped film. It is a figure for demonstrating the 2nd modification of a bag-shaped film. It is a figure for demonstrating the 3rd modification of a bag-shaped film. It is sectional drawing of the sound insulation structure which concerns on a 2nd form. It is a front view of the sound insulation structure concerning a 2nd form. It is sectional drawing for demonstrating the film of a sound-insulation structure which concerns on a 2nd form, and a frame connection part. It is sectional drawing in the pressurization state of the sound insulation structure which concerns on a 2nd form.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, sectional drawing of the sound-insulation structure 100 which concerns on this form is shown. FIG. 2 is a front view of the sound insulation structure 100. 1 is a cross-sectional view taken along the line XX shown in FIG. The sound insulation structure 100 according to the present embodiment can block the transmission of incident sound to one surface of the first surface A on the left side and the second surface B on the right side in FIG. 1 to the other surface side. It is. Moreover, the sound insulation structure 100 shown in FIG. 1 and FIG. 2 is a thing in the non-sound insulation state from which the sound insulation state which interrupts | blocks incident sound was cancelled | released. As shown in FIG. 1, the sound insulation structure 100 includes a frame 110 and a film 160 disposed inside the frame 110.

  As shown in FIG. 1, the frame 110 of this embodiment includes a frame body 120 on the first surface A side and a frame body 130 on the second surface B side. Both the frame bodies 120 and 130 are plate-shaped. The frame body 120 is disposed so as to face the frame body 130 on a surface 122 opposite to the surface 121 on the first surface A side. The frame body 130 is disposed so as to face the frame body 120 on a surface 132 opposite to the surface 131 on the second surface B side. That is, the frame body 120 and the frame body 130 are arranged so as to face each other on the respective surfaces 122 and 132.

  In addition, as shown in FIG. 1, the upper and lower side surfaces of the frame 110 are constituted by outer walls 140. As shown in FIG. 2, the outer wall 140 is a member that forms not only the upper and lower side surfaces of the frame 110 but also the left and right side surfaces. In FIG. 1, the frame 130 is shown with parentheses. As shown in FIGS. 1 and 2, the frame body 120 and the frame body 130 are connected by the outer wall 140 at the outer edge portions of the facing surfaces 122 and 132.

  Further, as shown in FIG. 1, a plurality of through holes 123 and 133 are formed in the frame bodies 120 and 130 so as to penetrate in the thickness direction. The through holes 123 and 133 in this embodiment are both square as shown in FIG. That is, both the frames 120 and 130 are lattice-like plate members. The through hole 123 of the frame body 120 and the through hole 133 of the frame body 130 are formed at positions where they overlap each other when viewed from the front. Further, the through holes 123 and 133 are formed in central regions inside the outer edges of the frame bodies 120 and 130, respectively.

  The shape of the through holes 123 and 133 is not limited to a square, but may be a rectangle, a rhombus, or a parallelogram. Alternatively, it may be a triangle or a hexagon. Furthermore, the through hole 123 of the frame body 120 and the through hole 133 of the frame body 130 may be formed at different positions when viewed from the front. In addition, the through hole 123 of the frame body 120 and the through hole 133 of the frame body 130 may have different shapes.

  As shown in FIG. 1, the film 160 is disposed in a space inside the frame 110 surrounded by the frame bodies 120 and 130 and the outer wall 140. The film 160 is a thin film having flexibility, and in the present embodiment, is a bag-like one. The film 160 preferably has a high barrier property, and a resin film made of polyvinylidene chloride or the like can be used. A sealed space 161 is formed inside the bag-shaped film 160. That is, the sealed space 161 is partitioned from the external space by the film 160.

  Further, the sound insulation structure 100 is provided with a frame body connection portion 150. As shown in FIG. 1, the frame body connecting portion 150 is a member that connects the frame body 120 and the frame body 130 of the frame 110 at the surfaces 122 and 132 that face each other. Moreover, the frame connection part 150 is located in the center of the sound insulation structure 100, as shown in FIG.

  The film 160 is provided with an annular portion 162 as shown in FIGS. The annular portion 162 is formed by connecting the first surface A side and the second surface B side of the bag-shaped film 160, and has an annular shape as shown in FIG. As shown in FIG. 2, the annular portion 162 is located at the center of the sound insulation structure 100. That is, in the sound insulation structure 100 of this embodiment, the annular portion 162 of the film 160 is provided so as to surround the frame body connection portion 150. Further, the frame body connecting portion 150 connects the frame bodies 120 and 130 through the inside of the annular portion 162 of the film 160. As shown in FIG. 2, the bag-shaped film 160 is provided with an annular portion 162, but the sealed space 161 is a single space.

  In FIGS. 1 and 2, a gap is formed between the outer peripheral surface of the frame connecting portion 150 and the inner surface of the annular portion 162 of the film 160. Similarly, a gap is formed between the inner surface of the outer wall 140 and the film 160. That is, in the non-sound insulation state shown in FIGS. 1 and 2, the film 160 is not in contact with the outer peripheral surface of the frame connecting portion 150 and the inner surface of the outer wall 140.

  Further, as shown in FIG. 2, a pressure adjustment unit 170 is provided on the upper left of the sound insulation structure 100. The pressure adjusting unit 170 is connected to the sealed space 161 of the bag-shaped film 160 and is for adjusting the pressure in the sealed space 161. Therefore, the pressure adjustment unit 170 can suck the air outside the sound insulation structure 100 into the sealed space 161. Further, the air inside the sealed space 161 can be discharged to the outside of the sound insulation structure 100.

  In the sound insulation structure 100 of this embodiment, the pressure adjustment unit 170 adjusts the pressure of the sealed space 161 to switch between a sound insulation state that does not transmit incident sound and a non-sound insulation state that transmits almost all incident sound. it can. Specifically, when the sound insulating structure 100 is in a sound insulating state, the pressure adjusting unit 170 causes the pressure in the sealed space 161 to be higher than atmospheric pressure. This state is referred to as a pressurized state in this embodiment.

  On the other hand, when the sound insulating structure 100 is in a non-sound insulating state, the pressure adjusting unit 170 causes the pressure of the sealed space 161 to be almost the same as the atmospheric pressure. This state is referred to as a pressure release state in this embodiment. That is, since the sound insulation structure 100 shown in FIGS. 1 and 2 is in a non-sound insulation state as described above, the sound insulation structure 100 is in a pressure release state.

  In the pressure release state shown in FIGS. 1 and 2, the pressure of the sealed space 161 is almost the same as the atmospheric pressure, so that the film 160 is pressed against the inner surface of the frame 110 that surrounds the film 160. There is no. In other words, in the sound insulation structure 100 in the pressure release state, the film 160 is in a state where no special tension is applied as in the pressure state described later. For this reason, the sound insulation structure 100 in the pressure release state is in a non-sound insulation state in which sound incident on one surface of the first surface A and the second surface B can be transmitted almost to the other surface side. is there.

  FIG. 3 shows a cross-sectional view of the sound insulation structure 100 in a pressurized state. In the sound insulation structure 100 in the pressurized state, the flexible bag-shaped film 160 is inflated because the sealed space 161 is maintained at a positive pressure that is higher than the atmospheric pressure. For this reason, the bag-like film 160 is pressed against the inner surface of the frame 110 surrounding the bag-like film 160.

  Specifically, in the pressurized state shown in FIG. 3, the film 160 is pressed against the inner surfaces 122 and 132 of the frame bodies 120 and 130. Further, the film 160 protrudes outward from the inside of the frame 110 at the portions of the through holes 123 and 133 of the frame bodies 120 and 130. Further, the portion of the film 160 at the center of the through holes 123 and 133 has a dome shape protruding outward. Therefore, a tension is applied to the film 160 in the pressurized state shown in FIG. 3 to balance the differential pressure that is the difference between the pressure in the sealed space 161 and the external atmospheric pressure.

  The pressurized sound insulation structure 100 is in a state of large transmission loss due to the tension applied to the film 160. This is considered to be because the resonance frequency of the film 160 in the tensioned state is higher than the audible frequency region. Further, in the sound insulation structure 100 in a pressurized state, the frame 110 receives a force in a direction from the inside to the outside by the expanding film 160. For this reason, the vibration of the frame 110 is suppressed. Therefore, the sound insulation structure 100 in the pressurized state can take a sound insulation state in which the incident sound to one surface of the first surface A and the second surface B is hardly transmitted to the other surface side. it can.

  Moreover, as the film 160, a thinner one is preferable. This is because the thinner the thickness, the higher the resonance frequency in the pressurized state. Furthermore, the size of the through holes 123 and 133 of the frame bodies 120 and 130 is preferably as small as possible. This is because the resonance frequency tends to increase as the area of the inner portion of the film 160 pressed against the edges of the through holes 123 and 133 decreases.

  In the pressurized state shown in FIG. 3, the bag-like film 160 is pressed against the outer peripheral surface of the frame connecting portion 150 and the inner surface of the outer wall 140 due to the expansion. That is, there are no gaps between the film 160 and the frame connecting portion 150 in the pressure release state and between the film 160 and the inner surface of the outer wall 140. For this reason, the incident sound to the 1st surface A or the 2nd surface B does not permeate | transmit to the other surface side through a clearance gap.

  Further, in the sound insulation structure 100 in a pressurized state, the frame bodies 120 and 130 receive a force in a direction away from the expanding bag-like film 160. However, the frames 120 and 130 are hardly deformed by the force received by the pressurized film 160. This is because the frames 120 and 130 are connected by the outer wall 140 at their outer edge portions. Further, the frame bodies 120 and 130 are connected to each other at the center portion by the frame body connecting portion 150. For this reason, for example, only the central part of the frames 120 and 130 is not greatly deformed.

  Further, in this embodiment, the frame connecting portion 150 is provided at the center of the sound insulating structure 100, but at a position slightly deviated from the center, that is, at the center where the through holes 123 and 133 inside the outer edge are formed. It may be provided in the area. The film 160 may be provided with an annular portion 162 that surrounds the frame connecting portion 150. In this embodiment, a cylindrical shape is shown as the frame connecting portion 150, but it is not limited to a cylindrical shape, and may be a column or wall having an elliptical, triangular, or square cross section.

  Also, a plurality of the frame connecting portions 150 and the annular portion 162 of the film 160 can be provided. For this reason, even if it is a sound insulation structure where the area of the 1st surface A and the 2nd surface B is larger than the sound insulation structure 100 of this form shown in FIGS. 1-3, a structure does not become complicated. This is because the larger the area, the more frame body connecting portions 150 can be provided and the deformation of the frame bodies 120 and 130 can be suppressed. This allows a simple configuration regardless of the area to be sound-insulated.

  Moreover, the sound insulation structure 100 of this embodiment can take a sound insulation state by placing the sealed space 161 in a pressurized state and applying tension to the film 160. Furthermore, the frame bodies 120 and 130, the outer wall 140, and the frame body connection part 150 should just have the rigidity which can support the tension | tensile_strength of the film 160. FIG. Therefore, the sound insulation structure 100 can be light and thin.

  Further, in the sound insulation structure 100 of the present embodiment, the film 160 may not be a bag-like one. That is, it is good also as a structure which affixed the flexible film on each surface 122,132 which faces each of frame 120,130. Even in such a configuration, by pressing the sealed space 161 between the frame bodies 120 and 130 partitioned from the outside by the film, the sound insulation state can be taken as in the sound insulation structure 100 of the present embodiment. Because.

  Moreover, as a material of the frame bodies 120 and 130, the outer wall 140, and the frame body connection part 150 of the sound insulation structure 100, what has viscoelasticity is preferable. That is, it preferably has a property of being deformed to some extent by an external force when an external force is applied and returning to its original shape when the external force is removed. It is because the adhesiveness with the film 160 in a pressurized state can be made favorable because the frame bodies 120 and 130 have viscoelasticity. In the sound insulation structure 100 of this embodiment, the incident sound on one of the first surface A and the second surface B can be transmitted to the outer wall 140 and the frame connecting portion 150 and transmitted to the other surface. is there. This is because the transmission loss can be increased by virtue of the viscoelasticity of the outer wall 140 and the frame connecting portion 150 against such transmitted sound. That is, a polymer material or the like can be preferably used for the frame bodies 120 and 130, the outer wall 140, and the frame connection portion 150. Further, a metal spring can be used for the frame connecting portion 150.

  Furthermore, at least the film 160 is preferably transparent or translucent. This is because the visibility on the other side of the sound insulation structure 100 from the one side of the first surface A and the second surface B of the sound insulation structure 100 can be ensured. Also, the frame bodies 120 and 130 are preferably transparent or translucent. This is because the visibility on the other side of the sound insulation structure 100 can be further improved.

  In the sound insulation structure 100 of this embodiment, the transmission loss can be adjusted by adjusting the pressure of the sealed space 161 by the pressure adjusting unit 170. FIG. 4 shows the result of measuring the transmission loss for each pressure in the sealed space 161 of the sound insulation structure 100.

  In FIG. 4, the horizontal axis represents frequency and the vertical axis represents transmission loss. Further, in FIG. 4, a case where the pressure of the sealed space 161 is atmospheric pressure is indicated by a two-dot chain line, a case where the pressure is weak positive pressure is indicated by a broken line, and a case where the pressure is strong positive pressure is indicated by a solid line. That is, in FIG. 4, the two-dot chain line indicates the transmission loss of the sound insulation structure 100 in the pressurized release state, and the broken line and the solid line indicate the transmission loss of the sound insulation structure 100 in the pressurized state.

  As shown in FIG. 4, the transmission loss of the sound insulation structure 100 in a pressure release state in which the pressure of the sealed space 161 is atmospheric pressure is small regardless of the frequency of the incident sound. That is, it can be seen that the sound insulation structure 100 in the pressure release state is hardly insulated. Further, as shown in FIG. 4, the transmission loss of the sound insulation structure 100 in the pressurized state with the pressure in the sealed space 161 being positive is larger in all frequency bands than the transmission loss of the sound insulation structure 100 in the released pressure state. I understand that.

  Furthermore, it can be seen from FIG. 4 that the sound insulation structure 100 has a larger transmission loss and a higher sound insulation effect when the pressure of the sealed space 161 is a strong positive pressure than when the pressure of the sealed space 161 is a weak positive pressure. That is, it can be seen that the sound insulation structure 100 can adjust the transmission loss by adjusting the pressure of the sealed space 161. In the results of FIG. 4, the transmission loss of the sound insulation structure 100 is reduced in the frequency band indicated by Y in the figure for both the weak positive pressure and the strong positive pressure. However, even in the frequency band indicated by Y, the transmission loss is larger in the pressurized state than in the pressurized release state, and the sound insulation effect is maintained high.

  Further, since the sealed space 161 of this embodiment is a single space made of the bag-shaped film 160, the configuration for pressure adjustment is simple. That is, unlike the case where there are a plurality of sealed spaces 161, it is not necessary to provide a pressure adjusting unit for each of the plurality of sealed spaces 161. Alternatively, there is no need to provide piping or the like for connecting the plurality of sealed spaces 161 to the pressure adjusting unit.

  In the above description, the film 160 has been described as a bag-like shape in which the annular portion 162 is formed, but other shapes can also be used. As a first example of other shapes, the one shown in FIG. 5 can be considered. FIG. 5 is a view showing a sound insulation structure 101 having a film 180 having a shape different from that of the film 160 described above. FIG. 5 is a front view of the sound insulation structure 101, and is a cross-sectional view of the sound insulation structure 101 taken along a plane parallel to the first surface A and the second surface B. Also in the sound insulation structure 101, the structures of the frame bodies 120, 130 and the like are the same as those of the sound insulation structure 100 described above. The film 180 shown in FIG. 5 has a bag shape and has an elongated tube shape. Further, the film 180 is accommodated inside the frame 110 in a meandering manner in the vertical direction in the figure. The film 180 is meandering by a turn portion that is bent or curved. In the sound insulation structure 101, the frame body connection part 150 is provided between the films 180 adjacent to each other through the turn part by meandering. The place where the frame body connecting portion 150 is provided is in the central region where the through holes 123 and 133 inside the outer edge are formed. Further, the sound insulation structure 101 shown in FIG. 5 is in a pressure release state, and a gap is formed between adjacent sections due to meandering of the elongated film 180. However, the gap is in close contact with the bag-like film 180 in a pressurized state, and is eliminated. In the pressurized state, the film 180 protrudes outward from the through holes 123 and 133. Therefore, even in the sound insulation structure 101 as shown in FIG. 5, the sound insulation state can be obtained by setting the pressure state.

  Further, for example, a second example shown in FIG. 6 can be considered. The sound insulation structure 102 shown in FIG. 6 has a bag-shaped film 181. The film 181 is in the form of an elongated tube, and is housed in a spirally wound shape inside the frame 110. And in the sound insulation structure 102, the frame connection part 150 is provided between the films 181 wound in a spiral. The place where the frame body connecting portion 150 is provided is in the central region where the through holes 123 and 133 inside the outer edge are formed. Further, the sound insulation structure 102 shown in FIG. 6 is also in the pressure release state, and the gap between the sections adjacent to each other through the turn portion of the film 181 is expanded in the pressure state. It is supposed to be gone. In the pressurized state, the film 181 protrudes outward from the through holes 123 and 133. Therefore, even in the sound insulation structure 102 as shown in FIG. 6, a sound insulation state can be obtained by applying a pressurized state.

  Further, for example, a third example shown in FIG. 7 can be considered. The sound insulation structure 103 shown in FIG. 7 has a bag-like film 182 in which the lower part in the drawing branches into three parts. And in the sound insulation structure 103, the frame connection part 150 is provided between the three branches of the film 182. The place where the frame body connecting portion 150 is provided is in the central region where the through holes 123 and 133 inside the outer edge are formed. Further, the sound insulation structure 103 shown in FIG. 7 is also in a state in which the pressure is released, and a gap at a place where the branches of the film 182 are adjacent to each other is prevented from expanding in the pressure state. Has been. In the pressurized state, the film 182 protrudes outward from the through holes 123 and 133. Therefore, even in the sound insulation structure 103 as shown in FIG. 7, a sound insulation state can be obtained by applying a pressurized state.

  As described above in detail, the sound insulation structure has a frame having a frame on the first surface A side and the second surface B side, and a space between the frames is formed from outside to form a sealed space. And have a film. Further, the two frames are connected at the center by a frame connecting portion. And in a pressurization state, a film protrudes outside from the through-hole of a frame. At this time, tension is applied to the film. For this reason, the transmission loss of the sound insulation structure increases in a pressurized state. Therefore, a lightweight and thin sound insulation structure is realized. Moreover, the deformation | transformation in the center of the frame in a pressurization state is suppressed by the simple structure which provided the frame connection part.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, in the case of being used in a sound-insulated state at all times, the sealed space 161 is enclosed and manufactured in a pressurized state, and the pressure adjusting unit 170 may not be provided. In this case, a valve for injecting air into the sealed space 161 may be provided in the film 160. Furthermore, in order to maintain the pressurized state of the sealed space 161, a valve for injecting air may be used as a check valve.

  Further, for example, by providing a convex portion projecting toward the film 160 inside the frame 110, the sealed space 161 can be always maintained in a pressurized state. At the time of manufacturing, when the bag-like film 160 is accommodated in the frame 110, a part of the film 160 is pressed by the convex portion. This is because the sealed space 161 can be brought into a pressurized state by the compression. In this case, the sealed space 161 can be maintained in a pressurized state due to the presence of the convex portion. Further, the protruding portion provided on the frame 110 may be capable of adjusting the protruding amount by, for example, control by a motor or user operation. This is because the pressure in the sealed space 161 can be adjusted. That is, it is possible to switch between the pressurized state and the released pressure state and to adjust the transmission loss. Furthermore, by using a bag-like film 160 that is larger than the volume inside the frame 110 in a free state, the sealed space 161 can always be maintained in a pressurized state. At the time of manufacturing, when the bag-like film 160 is accommodated in the frame 110, the film 160 is pressed by the frames 120 and 130 of the frame 110 and the outer wall 140. This is because the sealed space 161 is pressurized by the compression.

[Second form]
The second embodiment will be described. The sound insulation structure according to this embodiment is different from the first embodiment in the shape of the film. And in the sound insulation structure of this form, the frame connection part has connected two frames provided facing each other through the sealed space of a bag-like film.

  A cross-sectional view of the sound insulation structure 200 according to the second embodiment is shown in FIG. FIG. 9 is a front view of the sound insulation structure 200. FIG. 8 is a cross-sectional view at the ZZ position shown in FIG. Similarly to the first embodiment, the sound insulation structure 200 according to the present embodiment transmits the incident sound to one surface of the first surface A on the left side and the second surface B on the right side in FIG. 8 to the other surface side. It can be shut off. Moreover, the sound insulation structure 200 shown in FIGS. 8 and 9 is the one in a non-sound insulation state. As shown in FIG. 8, the sound insulation structure 200 includes a frame 210 and a film 260 disposed inside the frame 210.

  The frame 210 of this embodiment has the same configuration as the frame 110 of the first embodiment. That is, as shown in FIG. 8, each has a flat frame body 220 on the first surface A side and a frame body 230 on the second surface B side. Further, the frame body 220 and the frame body 230 are disposed so as to face each other on a surface 222 and a surface 232 opposite to the surface 221 on the first surface A side and the surface 231 on the second surface B side, respectively. Further, as shown in FIGS. 8 and 9, the frame body 220 and the frame body 230 are connected by an outer wall 240 at the outer edge portion. Further, a plurality of square through holes 223 and 233 penetrating in the thickness direction are formed in the frame bodies 220 and 230, respectively, in a central region inside the outer edge. Also in this embodiment, the shape of the through holes 223 and 233 is not limited to a square, but may be a rectangle, a rhombus, or a parallelogram. Alternatively, it may be a triangle or a hexagon.

  Also in the sound insulation structure 200, the film 260 is disposed in a space inside the frame 210 surrounded by the frame bodies 220 and 230 and the outer wall 240, as shown in FIG. The film 260 of this embodiment is also a bag-shaped film made of a flexible thin film. In addition, one sealed space 261 is formed inside the bag-like film 260. Further, as shown in FIG. 9, the bag-like film 260 is connected with a pressure adjusting unit 270 for adjusting the pressure in the sealed space 261. Also in this embodiment, as shown in FIGS. 8 and 9, a gap is formed between the inner surface of the outer wall 240 and the film 260. That is, in the non-sound insulation state, the film 260 is not in contact with the inner surface of the outer wall 240.

  The sound insulation structure 200 is also provided with a frame body connecting portion 250 that connects the frame body 220 and the frame body 230 at the center thereof. The frame connection part 250 of this embodiment penetrates the first surface A side and the second surface B side of the bag-like film 260 and connects the frame bodies 220 and 230. That is, the frame body connecting part 250 connects the frame bodies 220 and 230 through the sealed space 261.

  FIG. 10 is an enlarged cross-sectional view for explaining the frame connecting portion 250 and the film 260 at that location. As shown in FIG. 10, the frame body connection part 250 penetrates the left and right films 260 and connects the frame bodies 220 and 230 through the sealed space 261. Further, both the front and back sides of the film 260 are sandwiched between the seal members 251 where the frame connecting portion 250 penetrates. The seal member 251 is for sealing the gap between the hole of the film 260 through which the frame body connecting portion 250 passes and the outer peripheral surface of the frame body connecting portion 250 so that air does not pass through. Thereby, the airtightness of the sealed space 261 is maintained, and air does not leak even when the sealed space 261 is set to a pressure higher than the atmospheric pressure.

  In the non-sound insulation state shown in FIGS. 8 and 9, in this embodiment as well, the pressure release state is set such that the pressure in the sealed space 261 is substantially the same as the atmospheric pressure. For this reason, the film 260 is not pressed against the inner surface of the frame 210 surrounding the film 260. In other words, the sound insulation structure 200 in the pressure release state is in a non-sound insulation state because no special tension is applied to the film 260. In the sound insulation structure 200 as well, a sound insulation state can be obtained by setting the pressure of the sealed space 261 to a pressure higher than the atmospheric pressure by the pressure adjustment unit 270.

  In FIG. 11, sectional drawing of the sound-insulation structure 200 of a pressurization state is shown. In the pressurized state, also in the sound insulation structure 200, the portions of the through holes 223 and 233 of the frame bodies 220 and 230 of the film 260 have a dome shape protruding from the inside of the frame 210 to the outside. And also in the sound insulation structure 200 of a pressurization state, the sound insulation state can be taken by the tension | tensile_strength being applied to the film 260 similarly to the sound insulation structure 100 of a 1st form.

  Further, in the pressurized state shown in FIG. 11, the bag-like film 260 is in close contact with the inner surface of the outer wall 240 due to expansion. That is, there is no gap between the film 260 and the inner surface of the outer wall 240. Furthermore, in the sound insulation structure 200 according to the present embodiment, the portion of the film 260 through which the frame body connecting portion 250 passes is sealed by the seal member 251, so that the pressure release state and the pressurized state can be maintained. There is no gap. For this reason, in a sound insulation state, the incident sound to the 1st surface A or the 2nd surface B does not permeate | transmit to the other surface side through a clearance gap.

  Also in this embodiment, the frame bodies 220 and 230 are connected to each other at the outer edge portion by the outer wall 240 and at the center portion by the frame body connecting portion 250. For this reason, for example, the bag-like film 260 that expands in a pressurized state does not greatly deform only the central portions of the frame bodies 220 and 230.

  8 to 11, the frame connecting portion 250 is provided only at the center of the sound insulation structure 200, but a plurality of positions other than the center or other locations may be provided. In that case, a hole for allowing the frame body connecting portion 250 to pass therethrough is made in the film 260, and a seal member 251 may be provided at that portion for sealing. Therefore, even if the sound insulation structure has a larger area on the first surface A and the second surface B than the sound insulation structure 200 of the present embodiment shown in FIGS. 8 to 11, the deformation of the frames 220 and 230 with a simple configuration. Can be suppressed. Also in the sound insulation structure 200, the transmission loss can be adjusted by adjusting the pressure of the sealed space 261 by the pressure adjusting unit 270.

  As described above in detail, the sound insulation structure 200 includes the frame 210 having the frame bodies 220 and 230, and the film 260 that forms the sealed space 261 by partitioning the space between the frame bodies 220 and 230 from the outside. And have. Also in the present embodiment, the frame bodies 220 and 230 are connected by the frame body connection portion 250 at the center. Therefore, a light-weight and thin sound-insulating structure having a simple configuration is realized irrespective of the area of the sound-insulating object.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, in the case of being used in a sound-insulated state at all times, the sealed space 261 is manufactured in a pressurized state, and the pressure adjusting unit 270 may not be provided. In addition, for example, the seal at a location where the frame connecting portion 250 of the film 260 penetrates is not limited to the seal member 251, and may be one using welding or a sealant.

DESCRIPTION OF SYMBOLS 100 ... Sound insulation structure 160 ... Film 120, 130 ... Frame 150 ... Frame body connection part 160 ... Film 161 ... Sealed space A ... 1st surface B ... 2nd surface

Claims (10)

In a sound insulating structure having a first surface and a second surface opposite to the first surface, and blocking sound propagation from the first surface to the second surface,
A first surface portion positioned on the first surface side; and a second surface portion positioned on the second surface side and spaced apart from the first surface portion, the first surface portion and the second surface portion, In any of the above, a frame in which a plurality of through holes are formed in a central region inside the outer edge,
A connecting member for connecting the first surface portion and the second surface portion of the frame within the central region;
A flexible film that is located between the first surface portion and the second surface portion, and that forms a sealed space by partitioning a space between the first surface portion and the second surface portion from an external space When,
A pressure maintaining part for maintaining the sealed space at a pressure higher than atmospheric pressure,
When the sealed space is pressurized to a pressure higher than atmospheric pressure, the film has a tension while projecting outward from the sealed space to the outside through the through holes of the first surface portion and the second surface portion. A sound insulation structure characterized by blocking sound transmission by taking the applied pressure state. The sound insulation structure according to claim 1,
The sound insulation structure according to claim 1, wherein the film has a bag shape. The sound insulation structure according to claim 1 or 2,
The sound insulation structure, wherein the film is provided with an annular portion that surrounds the connecting member and is formed by connecting the first surface side and the second surface side of the film. The sound insulation structure according to claim 2,
The film has an elongated tube shape, and a turn portion that is bent or curved in a plane that is not orthogonal to the first surface is provided between one end and the other end of the film.
The connecting member connects the first surface portion and the second surface portion through a section where one end side and the other end side of the film are adjacent to each other via the turn portion. A sound insulation structure characterized by being. The sound insulation structure according to claim 2,
The film has two or more branched branches,
The connection member is a sound insulation structure characterized in that the first surface portion and the second surface portion are connected through the branch portions. The sound insulation structure according to any one of claims 3 to 5,
The sound insulation structure according to claim 1, wherein the film is in a state of being pressed by the connecting member in the pressurized state. The sound insulation structure according to claim 1 or 2,
The sound insulation structure, wherein the connecting member penetrates the film and connects the first surface portion and the second surface portion through the sealed space. The sound insulation structure according to any one of claims 1 to 7,
The sound insulation structure according to claim 1, wherein the connecting member is made of a material having viscoelasticity. The sound insulation structure according to any one of claims 1 to 8,
The pressure maintaining unit includes a pressure adjusting unit configured to adjust the pressure of the sealed space by moving air between the sealed space and the outside;
The pressure adjusting unit takes the pressurized state when air is sucked into the sealed space from the outside, and the pressure adjusting unit releases the pressurized state from the sealed space to release the pressurized state. A sound insulation structure characterized by being able to take a pressurized release state. The sound insulation structure according to any one of claims 1 to 9,
The sound insulation structure according to claim 1, wherein at least the film in the group consisting of the film, the frame, and the connecting member is transparent or translucent.

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