Abstract
Provided is a duct damper comprising: a hollow housing provided inside the duct so as to enable ventilation; a blocking plate provided in the housing and opening and closing the hollow; a fastener detachably fixing the blocking plate to the housing; and shape maintaining members respectively provided on the sides of the blocking plate so as to respectively maintain half of the shape formed by the blocking plate. According to the present invention, even if both sides of the blocking plate are bent with a center bar as an axis, since the shape maintaining members half and half support the both sides of the blocking plate, respectively, so as to maintain the shape, vibrations are not generated at either side of the blocking plate, thereby preventing noise.
Claims
1. A duct damper comprising: a housing having a hollow and installed in the interior of a duct such that air ventilates through the housing; a blocking plate of a soft material, which is provided in the housing to open and close the hollow; a fastener configured to fix the blocking plate to the housing; and a shape maintaining member configured to maintain the shape of a soft portion of the blocking plate, which is not fixed by the fastener, wherein the shape maintaining member includes: a bar-shaped center bar provided to be long in a line form along a center line direction of the blocking plate on opposite sides of the blocking plate, which are spaced apart from each other by a predetermined interval in a horizontal direction from the center line of the blocking plate to be symmetrical to each other, and configured to provide a reference axis, by which the blocking plate is bent; and a support bar extending from the center bar to be integrally formed to an edge of the blocking plate and configured to suppressing deformation of the shape of the blocking plate.
2. The duct damper of claim 1, wherein the housing includes: a seating frame provided in a state in which the seating frame crosses the interior of the housing to be divided into halves and having a predetermined width such that the blocking plate is seated on the seating frame; and a stepped seating seat protruding along an inner edge of the housing such that an edge of the blocking plate seated on the seating fame is seated on the seating seat.
3. The duct damper of claim 1, wherein the fastener includes: a plurality of bosses protruding along a lengthwise direction of the seating frame; and hole-shaped coupling holes formed to pass through the blocking plate to correspond to the coupling bosses and coupled in a state in which the coupling bosses pass through the coupling holes.
4. The duct damper of claim 1, wherein the support bar includes: a plurality of ribs extending from the center bar to an end of the edge of the blocking plate, radially formed from the center bar, and configured to partially support a surface of the blocking plate.
5. The duct damper of claim 1, wherein the support bar includes: a rib extending from the center bar along the edge of the blocking plate, provided to have a shape corresponding to the edge of the blocking plate, and configured to support the entire edge of the blocking plate.
6. The duct damper of claim 5, further comprising: a weight member provided on a surface of the blocking plate that is opposite to a surface of the blocking plate, which is provided with the shape maintaining member, and configured to provide a weight to the blocking plate.
7. The duct damper of claim 6, wherein the blocking plate further includes: a stepped step formed at a lower end of the edge of the blocking plate as the weight member corresponds to the shape maintaining member and is spaced apart from an inner side of the edge of the blocking plate by a predetermined interval.
8. The duct damper of claim 2, further comprising: a net-shaped auxiliary frame formed in the interiors of opposite sides of the housing divided by the seating frame and configured to support a lower portion of the blocking plate to prevent reverse movement of the blocking plate.
Description
DESCRIPTION OF THE INVENTION
[0068] FIG. 1 is a view illustrating an overall appearance of a duct damper according to an embodiment of the present invention.
[0069] FIG. 2 is an exploded view illustrating a configuration of FIG. 1.
[0070] FIG. 3 illustrates sectional views of FIG. 1, taken along A-A and B-B.
[0071] FIG. 4 is a view illustrating an overall appearance of a duct damper according to another embodiment of the present invention.
[0072] FIG. 5 is an exploded view illustrating a configuration of FIG. 4.
[0073] FIG. 6 illustrates sectional views of FIG. 4, taken along C-C and D-D.
[0074] FIG. 7 is a view illustrating an overall appearance of a duct damper according to another embodiment of the present invention.
[0075] FIGS. 8 and 9 are views illustrating an overall appearance of a duct damper according to another embodiment of the present invention.
DESCRIPTION OF MAIN REFERENCE NUMERALS
[0076] 100: Duct damper [0077] 110: Housing [0078] 111: Seating frame [0079] 113: Seating seat [0080] 115: Auxiliary frame [0081] 130: Blocking plate [0082] 131: Step [0083] 150: Fastener [0084] 151: Coupling boss [0085] 151a: Hook [0086] 153: Coupling hole [0087] 155: Fixing bar [0088] 170: Shape maintaining member [0089] 171: Center bar [0090] 173: Support bar [0091] 175: Contact prevention part [0092] 190: Weight member [0093] S: Hollow
BEST MODE
[0094] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0095] All the terms of the specification are the same as the general meanings of the terms, which are understood by an ordinary person in the art to which the present invention pertains, and if the terms used in the specification do not agree with the general meanings of the terms, their meanings follows the definitions used in the specification.
[0096] Meanwhile, the configurations or systems of the apparatus, which will be described below, are provided only to describe the embodiments of the present invention and are provided not to define the scope of the present invention, and the reference numerals, which are used over the specification, denote the same elements.
[0097] A duct damper 100 according to the present invention includes a housing 110, a blocking plate 130, a fastener 150, and a shape maintaining member 170
[0098] The housing 110 is an element installed in the interior of a duct, and as illustrated in FIG. 2, is provided with a hollow S which passes through the interior of the housing 110. The overall shape of the housing 110 preferably is a cylindrical shape as illustrated, but may be various shapes, such as a rectangular shape and a polygonal shape, which correspond to the shape of the duct. Accordingly, the housing 110 may be easily installed in the interior of the duct regardless of the shape of the duct.
[0099] The housing 110 functions as a passage, through which contaminated air in an interior, such as the interior of a room, a bathroom, or a kitchen, is discharged to the outside, and blocks exterior air from being introduced into the interior through the blocking plate 130, which will be described below. The housing 110 includes a seating frame 111 and a seating seat 113 to install the blocking plate 130 in the interior thereof.
[0100] The seating frame 111 is an element, on which the blocking plate 130 is seated, and as illustrated in FIG. 2, is provided in a state in which the seating frame 111 crosses the interior of the housing 110 to divide the hollow S of the housing 110 into halves. As illustrated, the seating frame 111 has a bar shape having a specific width. Accordingly, as illustrated in FIGS. 1 and 3, a center line (CL) portion of the blocking plate 130, which will be described below, is seated on the seating frame 111. Accordingly, the blocking plate 130 constitutes a state in which the blocking plate 130 is provided in the interior of the housing 110 by the seating frame 111. The seating seat 113 is an element, on which an edge of the blocking plate 130 is seated, and as illustrated in FIG. 2, protrudes along an inner edge of the housing 110. As illustrated, the seating seat 113 has a shape corresponding to the shape of the housing 110, and as illustrated in FIG. 2, has an annular shape and has the form of a protrusion which protrudes by a predetermined length. Accordingly, as illustrated in FIGS. 1 and 3A, an edge portion of the blocking plate 130, which will be described below, is seated on the seating seat 113. Accordingly, opposite sides of the blocking plate 130 are supported by the seating seat 113, and thus are prevented from reversely moving to the inner side of the housing 110. Here, the reverse movement means that the blocking plate 130 moves reversely in a direction that is opposite to a normal direction, and means that the opposite sides of the blocking plate 130 are bent to the inner side of the housing 110.
[0101] Meanwhile, the seating frame 111 and the seating seat 113, which have been described above, form inclined states as illustrated in FIGS. 2 and 3B. In detail, the seating frame 111 and the seating seat 113 are provided in a form in which the seating frame 111 and the seating seat 113 are inclined with respect to a vertical direction of the axial direction formed by the housing 110 in a state in which the seating frame 111 and the seating seat 113 are provided in the interior of the housing 110. Accordingly, because the seating frame 111 and the seating seat 113 provide an inclination to the blocking plate 130, which will be described, as illustrated, if flows of a fluid are not further generated after opposite sides of the blocking plate 130 are bent in one direction (a forward direction) by the flows of the fluid, which flows in the interior of the housing 110, the opposite sides of the blocking plate 130 are naturally bent in an opposite direction (a reverse direction or a gravitational direction). Then, because an edge portion of the blocking plate 130 is seated on the seating seat 113, which has been described above, the blocking plate 130 does not move reversely further into the interior of the housing 110 even though the opposite sides of the blocking plate 130 are bent in the opposite direction.
[0102] Meanwhile, the housing 110 may further include an auxiliary frame 115.
[0103] The auxiliary frame 115 is an element for supporting the blocking plate 130, and as illustrated in FIG. 7, is provided in the interiors of opposite sides of the hollow S divided by the seating frame 111. Then, the auxiliary frame 115 preferably forms a net shape. Accordingly, because the auxiliary frame 115 supports lower portions of the opposite sides of the blocking plate 130, the blocking plate 130 does not move reversely in the interior direction of the housing 110. However, the duct damper 100 according to the present invention can sufficiently prevent the blocking plate 130 from moving reversely in the interior direction of the housing 110 even when the auxiliary frame 115 is not included. In a short description, because the opposite sides of the blocking plate 130 are supported by the seating seat 113 when an edge of the blocking plate 130 is seated on the seating seat 113 in a state in which the opposite sides of the blocking plate 130 are maintained by the shape maintaining member 170, the blocking plate 130 does not move reversely into the interior of the housing 110, and the details will be described below.
[0104] The blocking plate 130 is an element for opening and closing the hollow S, which passes through the interior of the housing 110, and as illustrated in FIG. 2, has a shape corresponding to the shape of the housing 110 and is seated on the seating frame 111 and the seating seat 113, which have been described above. Accordingly, the blocking plate 130 may open or close the hollow S of the housing 110. The preferable method for opening and closing the blocking plate 130 will be described below.
[0105] Here, it is preferable that the blocking plate 130 includes a membrane formed of a soft material, such as silicon or rubber, which has a soft property. Accordingly, opposite sides of the blocking plate 130 may be naturally bent in one direction or an opposite direction without using a separate hinge unit by the flows of the flow, which passes through the hollow S of the housing 110 divided into halves as described above, in a state in which the blocking plate 130 is fixed to the seating frame 111 by the fastener 150, which will be described below. Then, because the blocking plate 130 is formed of a soft material, noise is generated due to a Karman vortex phenomenon in which the opposite sides of the blocking plate 130 flutters while being bent or folded when the flows of the fluid is severe, and the phenomenon can be prevented in advance by the shape maintaining member 170, which will be described below, and a detailed description thereof will be described below.
[0106] The fastener 150 is an element which fixes the blocking plate 130 to the housing 110, and as illustrated in FIG. 2, includes a plurality of coupling boss 151 and a plurality of coupling holes 153.
[0107] The coupling boss is an element coupled to the blocking plate 130 while passing through the blocking plate 130, and as illustrated in FIG. 2, has a boss shape which protrudes from one surface of the seating frame 111. A plurality of coupling bosses 151 are formed along a lengthwise direction of the seating frame 111 at a predetermined interval.
[0108] Accordingly, as illustrated in FIG. 1, the coupling bosses 151 are coupled to a portion of the blocking plate 130 seated on the seating frame 111 such that the blocking plate 130 does not deviate from the seating frame 111.
[0109] Meanwhile, each of the coupling bosses 151 may include a hook 151a.
[0110] As illustrated in the enlarged view B of FIG. 3, the hook 151a has a hook shape in which an end of the hook 151a is hooked by a surface of the blocking plate 130 in a state in which the hook 151a passes through the corresponding coupling hole 153, which will be described below. Accordingly, because the hooked portion of the hook 151a is hooked by the surface of the blocking plate 130 while passing through the blocking plate 130, the blocking plate 130 can be easily fixed to the seating frame 111 without using a separate coupling unit (a fixing bar 155 which will be described below).
[0111] The coupling holes 153 are elements, into which the coupling bosses 151 are inserted, and as illustrated in FIG. 2, are formed in the form of holes at portions, preferably, the center line (CL) portions of the blocking plate 130. The coupling holes 153 have the shapes corresponding to the number and the interval of the coupling bosses 151, which will be described below. Accordingly, the coupling holes 153 determine locations at which the blocking plate 130 is seated on the seating frame 111, and then, provide passages, through which the coupling bosses 151 passes through the blocking plate 130.
[0112] Meanwhile, the fastener 150 may further include a fixing bar 155.
[0113] The fixing bar 155 is an element which reinforces the fastening force of the fastener 150, and as illustrated in FIG. 2, has a bar shape having a predetermined thickness and a predetermined length. Preferably, the fixing bar 155 has a shape corresponding to the seating frame 111, which has been described above. As illustrated in the enlarged view A of FIG. 3 and the enlarged view A of FIG. 6, the fixing bar 155 is fixed to the coupling bosses 151, which pass through the blocking plate 130. Accordingly, the fixing bar 155 can further reinforce the fastening force of the fastener 150, which fixes the blocking plate 130 to the seating frame 111, in a state in which the blocking plate 130 is supported in an adherence state once more.
[0114] Meanwhile, as illustrated in FIG. 8, when opposite sides of a lower portion of the fixing bar 155 form corners, a concentrated load phenomenon in which a load is intensively applied to contact portions while portions of opposite sides of the bent blocking plate 130 are pressed by the corners in a point-contact form, and thus a damage, such as tearing, to the blocking plate 130 cans be caused. The fixing bar 155 may further include a damage preventing part 155a for preventing a concentrated load from being applied to a portion of the blocking plate 130.
[0115] For example, as illustrated in the enlarged view of FIG. 8A, the damage preventing part 155a may have round shapes at opposite ends of a lower end of the fixing bar 155. Accordingly, when the opposite sides of the blocking plate 130 are bent with respect to the fixing bar 155 in a state in which the blocking plate 130 is fixed by the fixing bar 155 as illustrated, portions of opposite sides of the blocking plate 130 come to surface-contact the damage preventing part 155a formed in the fixing bar 155 instead of point-contacting the damage preventing part 155a and thus a concentrated load phenomenon in which a load is intensively applied to the portions of the opposite sides of the blocking plate 130 is not caused. That is, because no concentrated load is caused in the portions of the opposite sides of the blocking plate 130, damage to the blocking plate 130 due to a concentrated load can be prevented in advance.
[0116] The shape maintaining member 170 is an element for maintaining the shape of the blocking plate 130, and maintains the shape of the remaining soft portions of the blocking plate 130, which are not fixed by the fastener 150, which has been described above. Preferably, the shape maintaining members 170 are provided on opposite sides of the blocking member 130, respectively, and can maintain the shapes of the opposite sides of the blocking plate 130 in the same way.
[0117] Here, the shape maintaining member 170 may be formed of a soft material, such as silicon or rubber, which has the same soft property as the blocking plate 130, which has been described above. Accordingly, because the shape maintaining member 170 is formed of the same material as the blocking plate 130, which has been described above, it may be easily integrally formed with the blocking plate 130 as illustrated in FIGS. 1 to 3. Further, the shape maintaining member 170 may be formed of a hard material, such as urethane or plastic, which has a hard and solid property, which is different from the property of the blocking plate 130, which has been described above. Accordingly, because the shape maintaining member 170 is formed of a material, which is different from that of the blocking plate 130, which has been described above, it may be integrally formed with the blocking plate 130 by a separate coupling means (welding, bonding, or the like) as illustrated in FIG. 6. Then, as illustrated in FIG. 9, the shape maintaining member 170 may be integrally formed with the blocking plate 130 through insert molding, in which the shape maintaining member 170 is inserted into the blocking plate 130.
[0118] Meanwhile, as illustrated in FIGS. 3A and 6A, because the shape maintaining member 170 has a thickness (t2) that is larger than the thickness (t1) of the blocking plate 130, it may be formed of a material, which is harder than the blocking plate 130, even though it is formed of the same soft material, and can easily maintain the shape thereof while supporting a surface of the blocking plate 130. The shape maintaining member 170 will be described in more detail on the basis of various following embodiments.
First Embodiment
[0119] As illustrated in FIGS. 2 and 3, the shape maintaining member 170 includes a center bar 171 and a support bar 173 which is integrally formed with the blocking plate 130.
[0120] The center bar 171 is an element which provides a reference axis (RA), by which the blocking plate 130 is bent, and as illustrated in FIG. 2, protrudes in a line form along the center line (CL) direction of the blocking plate 130 in a state in which the center bar 171 is provided at portions of the blocking plate 130, which are spaced apart from the center line (CL) of the blocking plate 130 horizontally, that is, the opposite sides of the blocking plate 130. The center bar 171 has a bar shape having a predetermined width. Accordingly, the center bar 171 supports a portion of a surface of the blocking plate 130 along a lengthwise direction thereof. Accordingly, only the shape of a portion of the blocking plate 130, at which the center bar 171 is formed, is maintained, and only a portion of the blocking plate 130, at which seating frame 111, which has been described above, is seated, that is, a soft portion between the center line (CL) portion and the portion at which the center bar 171 is bent. That is, the blocking plate 130 is bent along the reference axis (RA) provided while the center bar 171 is formed.
[0121] The support bar 173 is an element which partially supports the shape of the blocking plate 130, and as illustrated in FIG. 2, extends from the center bar 171, which has been described above, and protrudes to an end of an edge of the blocking plate 130. As illustrated, the support bar 173 has a plurality of ribs provided straight radially from the center bar 171. Then, the ribs have bar shapes having a predetermined width, and partially support a surface of the blocking plate 130 while protruding radially. Accordingly, even though the shapes of the portions of the blocking plate 130, at which the plurality of ribs are radially formed, is maintained, the soft portions of the blocking plate 130, at which the ribs are not provided, are sufficiently supported by the ribs and thus the deformation of the shape of the blocking plate 130 is suppressed. That is, because the support bar 173 has a minimum number of ribs which protrude radially, it can maintain the shape of the blocking plate 130 while suppressing the deformation of the shape of the blocking plate 130.
[0122] Because the shape maintaining member 170 of the first embodiment can bend the opposite sides of the blocking plate 130 while taking the center bar 171 as the reference axis (RA) and can maintain the blocking plate 130 from the center bar 171 to an end of the blocking plate 130 in the form of a plate by the support bar 173 so that noise can be prevented by preventing a Karman vortex phenomenon in which a portion of the blocking plate 130 flutters while being bent or folded when the flows of the fluid is severe and this can prevent noise
Second Embodiment
[0123] As illustrated in FIGS. 5 and 6, the shape maintaining member 170 includes a center bar 171 and a support bar 173 which are integrally coupled to each other by a separate coupling means.
[0124] The center bar 171 is an element which provides a reference axis (RA), by which the blocking plate 130 is bent, and as illustrated in FIG. 5, protrudes along the center line (CL) direction of the blocking plate 130 in a state in which the center bar 171 is provided at portions of the blocking plate 130, which are spaced apart from the center line (CL) of the blocking plate 130 horizontally. The center bar 171 has the same configuration as the first embodiment, which has been described above, and a detailed description thereof will be omitted.
[0125] The support bar 173 is an element which supports the entire shape of the blocking plate 130, and as illustrated in FIG. 5, extends from an end of one side of the center bar 171, which has been described above, and extends to ends of the opposite side of the center bar 171 along a circumference of the edge of the blocking plate 130. The support bar 173 includes a rib corresponding to an edge of one side of the blocking plate 130. Then, because the rib supports the entire surface of the edge of the blocking plate 130 while extending along the edge of the blocking plate 130, it maintains the entire shape defined by the blocking plate 130. Accordingly, because the support bar 173 supports the entire surface of the edge of the blocking plate 130, it can easily maintain the entire shape defined by the soft blocking plate 130. That is, the support bar 173 can maintain the shape of the blocking plate 130 while suppressing the deformation of the shape of the blocking plate 130.
[0126] Because the shape maintaining member 170 of the second embodiment can bend opposite sides of the blocking plate 130 while taking the center bar 171 as the reference axis (RA) and can easily maintain the plate shape of the blocking plate 130 by supporting the entire edge of the blocking plate 130 from the center bar 171 by the support bar 173, it can prevent a Karman vortex phenomenon in which a portion of the blocking plate 130 flutters while being bent or folded when the flows of the fluid is severe and this can prevent noise.
[0127] Accordingly, as described in the first embodiment and the second embodiment, which have been described above, because the shape maintaining member 170 extends from the center bar 171 provided in the blocking plate 130 to an end of the blocking plate 130 through the support bar 173 and is provided on the opposite sides of the blocking plate 130, it may maintain the shape of the blocking plate 130 while the opposite sides of the blocking plate 130 are maintained in the form of a plate. That is, because the plate shape of the blocking plate 130 is maintained until the edge portion with respect to the center bar 171 by the shape maintaining member 170 and the shape maintaining member 170 is not provided until the center line (CL) with respect to the center bar 171, the blocking plate 130 is freely bent with while taking the center bar 171 as the reference axis (RA).
[0128] Meanwhile, the shape maintaining member 170 may further include a contact preventing part 175.
[0129] The contact preventing part 175 is an element for preventing a contact phenomenon in which the opposite sides of the blocking plate 130 collide with each other, and as illustrated in FIGS. 8A and 8B, forms an inclined surface having an inclination structure in which the shape maintaining member 170 becomes lower from an end of the center bar 171 to an end of the support bar 173. Accordingly, because the blocking plate 130 provides an inclined surface of an inclination structure in which the shape maintaining member 170 is inclined as a whole by the contact preventing part 175 even though the opposite sides of the blocking plate 130 are bent by the flow velocities of the fluid flowing in the interior of the housing 110 to be perpendicular to each other, the opposite sides of the blocking plate 130 do not contact each other. That is, because a contact phenomenon in which the opposite sides of the blocking plate 130 collide with each other is prevented, generation of noise can be prevented in advance.
[0130] Meanwhile, the damper for preventing noise according to the present invention may further include a weight member 190.
[0131] The weight member 190 is an element which provides a weight to the blocking plate 130, and as illustrated in FIG. 6, is provided on a surface of the blocking plate 130, which is opposite to the surface on which the shape maintaining member 170 is located, that is, a lower surface of the blocking plate 130. Accordingly, the weight member 190 reinforces a load applied to the blocking plate 130 by providing a predetermined weight to the blocking plate 130. That is, because the weight member 190 provides an additional weight to the blocking plate 130 in an auxiliary way as well as the weight provided by the shape maintaining member 170 provided in the blocking plate 130, it can improve sealing performance by the load applied to an edge of the blocking plate 130 more effectively by the shape maintaining member 170 when the hollow S of the housing 110 is closed by the blocking plate 130 as will be described below.
[0132] The weight member 190 forms a shape corresponding to the shape maintaining member 170, which has been described above, and as illustrated in FIG. 8, is spaced apart from the blocking plate 130 toward the inner side of an edge of the blocking plate 130 by a predetermined interval. Then, as illustrated, the blocking plate 130 is provided with a stepped step 131 from an edge of the blocking plate 130 to an end of the weight member 190. Accordingly, an edge of a lower end of the blocking plate 130 is easily seated on the seating seat 113 by the stepped step 131, and then, a weight can be provided while the weight member 190 is naturally guided into the seating seat 113 without the weight member 190 is not stopped by the seating frame 111.
[0133] Meanwhile, the shape maintaining member 170 and the weight member 190, which have been described above, can be easily coupled to each other by the fastener (not illustrated) in a state in which the blocking plate 130 is disposed between the shape maintaining member 170 and the weight member 190. For example, the fastener (not illustrated) forms a boss on one surface of the shape maintaining member 170, and forms a hole-shaped holder on one surface of the weight member 190, that is, one surface of the weight member 190, which faces the shape maintaining member 170, such that the weight member 190 and the blocking plate 130 may be easily coupled to each other through press-fitting while the soft blocking plate 130 is supported. However, a method in which the shape maintaining member 170 and the weight member 190 are coupled to each other by the fastener (not illustrated), which has been described above, is not limited, and the shape maintaining member 170 and the weight member 90 can be easily coupled to each other in various forms, such as a separate adhesive, thermal fusion, a fastening means, and the like.
[0134] An operation of opening and closing the hollow S of the housing 110 by using the duct damper 100 having the above-mentioned structure will be described as follows.
[0135] First, the opposite sides of the blocking plate 130 are pushed away as illustrated in FIGS. 3A and 6A while the fluid generated in the interior of the housing 110 flows to the outside of the housing 110. Then, the blocking plate 130 opens the opposite sides of the hollow S of the housing 110 while the opposite sides of the blocking plate 130, except for the center line (CL) portion are bent in one direction (an outward direction or a forward direction) of the housing 110 because the center line (CL) portion of the blocking plate 130 is fixed to the seating frame 111. Because the blocking plate 130 is formed of a soft material from the center bar 171 to the center line (CL) portion, a bent state can be formed by a flowing force of the fluid as described above without using a separate hinge unit. Then, the opposite sides of the blocking plate 130 are bent by the center bar 171 which provides the reference axis (RA) while the plate shape of the blocking plate 130 is maintained by the shape maintaining member 170. Accordingly, when the interior fluid flows to the outside, the blocking plate 130 opens the hollow S while the opposite sides of the blocking plate 130, which blocks the hollow S, are naturally bent in the outward direction (a forward direction) by the flows of the fluid. Then, because a Karman vortex phenomenon in which the opposite sides of the blocking plate 130 flutters while being bent or folded is prevented by the support bar 173, the hollow S can be opened without causing noise. That is, the blocking plate 130 can discharge the contaminated air, which is generated in an interior, that is, an interior of a room, a bathroom, a kitchen, to the outside without causing noise.
[0136] Next, when further flows of the fluid are not generated after the air generated in the interior of the housing 110 is discharged to the outside, as illustrated in FIGS. 3B and 6B, the blocking plate 130 forms an inclination state by the seating frame 111 and the seating seat 113, and the opposite sides of the blocking plate 130 are naturally bent in an opposite direction (a reverse direction or a gravitational direction) by the self-weight of the blocking plate 130. Then, the blocking plate 130 can be more naturally bent in the gravitational direction by the weight provided by the shape maintaining member 170. Accordingly, the blocking plate 130 closes the hollow S while the opposite edges of the blocking plate 130 are naturally seated on the seating seat 113. Then, because the blocking plate 130 is formed of a soft material, noise is not caused even though the opposite sides of the edge of the blocking plate 130 are seated on the seating seat 113. In addition, the blocking plate 130 is provided with a load by the weight of the shape maintaining member 170, and a space between the seating seat 113 and the edge of the blocking plate 130 forms a sealed state because the edge of the blocking plate 130, which is seated on the seating seat 113, forms a pressed state by the load. Accordingly, the blocking plate 130 completely blocks the contaminated air generated on the outside from being introduced into the outside.
[0137] The damper for preventing noise according to the present invention can easily discharge the air in an interior (an interior of a room, a bathroom, a kitchen, and the like) to the outside, and can easily block the exterior air from being introduced into the interior.
