JP6849962B2 - Damper device - Google Patents

Description

The present invention relates to a damper device that is arranged in a duct path for air conditioning and controls gas flow and adjusts air volume.

In ducts such as the air supply system that sends conditioned air into the room, which is the target space for air conditioning, and the exhaust system that discharges air from the room for ventilation and smoke exhaust in the room, the flow path may be interrupted in the middle of the route. Damper devices were often installed for the purpose of adjusting the air volume. In particular, when air conditioning is performed in a relatively large indoor space such as an office space in a building, a variable air volume adjusting device (VAV) provided in a system connecting an air conditioner and a plurality of air outlets via a duct. ), Etc. are controlled, and the air volume blown out from the air outlet is adjusted to adjust the temperature of the indoor space to an appropriate temperature.
As an example of a conventional damper device used for such air conditioning, there is one disclosed in Japanese Patent Application Laid-Open No. 8-327132.

Japanese Unexamined Patent Publication No. 8-327132

As shown in the patent document, the conventional damper device tilts the damper blades around the support shaft to adjust the degree of opening, and the airflow of conditioned air is between the blades and the inner peripheral surface of the opening frame. Many have been adopted to control the flow rate toward the downstream side through the (butterfly type). In such a conventional damper device, the amount of tilt of the blade is small, the region (gap) between the blade end and the inner peripheral surface of the opening frame is narrow, and the airflow of conditioned air flows inside the blade end and the opening frame. When the flow velocity when passing between the peripheral surface and the peripheral surface became large, a vortex was generated at the outer peripheral end of the blade, and a sound was also generated accordingly.

Since the sound generated by such blades propagates to the downstream side through the duct as so-called wind noise, there is a problem that the noise diffuses to the indoor side of the air conditioning target and has an adverse effect.

The present invention has been made to solve the above problems, and it is possible to suppress the generation of a vortex at the blade end, quickly dissipate the generated vortex, control the sound generated based on the vortex, and generate noise. It is an object of the present invention to provide a damper device which can suppress the noise.

The damper device according to the present invention has a tubular opening frame that is arranged in a predetermined duct path to allow gas to flow, and is attached to the opening frame so as to be tiltable in the inner opening region of the opening frame. At least a plate-shaped blade and a drive mechanism that drives the blade from the outside of the opening frame to enable tilting are provided, and the blade can be tilted at a predetermined angle to adjust the opening area inside the opening frame. In the damper device, the blade is attached to the outer peripheral edge of the blade, and the blade closes between the outer peripheral edge of the blade and the inner peripheral surface of the opening frame in a closed state of the opening region where the blade is perpendicular to the continuous direction of the cylinder of the opening frame. A packing portion made of an elastically deformable material and a noise suppressing portion which is arranged on the outer peripheral portion of the packing portion and protrudes outward of the blades larger than the cross section of the inner opening region of the opening frame body are provided. The packing portion is expanded to the outside of the blade larger than the cross section of the inner opening region of the opening frame in the state of being attached to the blade, and in the closed state, the predetermined range is bent and deformed to the outer peripheral surface of the opening frame. The noise suppressing portion is made of a flexible material that can be elastically deformed at least when it receives the pressure of the gas flowing through the opening frame, and comes into contact with the peripheral surface of the opening frame in the packing portion. It is a large number of projecting pieces that are arranged and projected in the outer peripheral direction of the blade on the outside of the portion to be formed.

As described above, according to the present invention, a packing portion for closing the gap is provided at the end of the damper blade, and a noise suppression portion composed of a large number of protruding pieces is provided on the outside of the packing portion to make the packing portion elastic when the blades are closed. It can be deformed to maintain the closed state without difficulty, and when the blades are tilted and opened, the noise suppression unit is positioned at the end of the blades so that the blades can generate wind noise within the tilt angle range of the blades. Although the noise suppression part at the blade end serves as the generation point of the vortex due to the air flow, it is difficult for the gas flow to separate at the end of the blade with the flexible noise suppression part, the generation of the vortex can be suppressed, and a large number of protrusions occur. While being deformed by the pressure of the flowing gas, the flexible noise suppression section gives irregularity to the generation of the vortex and disturbs the vortex, complicating and destabilizing the vortex and promoting the disappearance of the vortex. Even if a vortex is generated, it can be dissipated in a short time, the generation of noise based on the vortex can be suppressed, and the noise transmitted to the downstream side of the duct path can be reduced.

Further, in the damper device according to the present invention, if necessary, the noise suppressing portion is connected to the outside of the portion of the packing portion that comes into contact with the peripheral surface of the opening frame in the closed state of the blades, and is integrally integrated with the packing portion. A large number of the projecting pieces having a predetermined width are arranged side by side while sandwiching linear notches or notches formed and provided at predetermined intervals in the outer peripheral direction of the blade.

As described above, according to the present invention, when each of the protruding pieces forming the noise suppression portion is arranged side by side on the outside of the packing portion as an integral structure with the packing portion installed at the blade end, the packing portion is attached to the blade end. At the same time, the noise suppression part can be arranged on the blades, which simplifies the structure of the blades and reduces the manufacturing cost. In addition, even if the noise suppression part deteriorates due to use, the packing part can be removed from the blades and replaced for maintenance. Efficiency is also improved.

Further, the damper device according to the present invention has a substantially bowl shape in which the blade is curved so as to shift the blade center portion in a direction perpendicular to the central axis direction of the blade tilt with respect to the blade peripheral portion, if necessary. It is formed as a curved surface shape, and is arranged so that the convex side of the curved surface faces the upstream side in the gas traveling direction of the opening frame body.

As described above, according to the present invention, the blades have a substantially bowl-shaped curved surface shape, and the convex side of the curved surface is arranged so as to face the upstream side in the gas traveling direction, so that the tilt angle from the closed position of the blades is small. In the tilt angle range where sound is likely to be generated, the blade end on the side displaced upstream due to tilt is directed toward the downstream side in the gas traveling direction, so that the blade ends are displaced upstream and a vortex is likely to be generated. At the blade end in, the direction of air traveling from the center of the blade to the edge of the peripheral edge along the downstream surface of the blade and between the opening frame and the blade along the peripheral surface inside the opening frame. The difference from the traveling direction of the air can be reduced, the air merges in the vicinity of the blade end more smoothly, and the generation of vortex at the blade end based on the air flow can be suppressed, and the noise based on the vortex can be suppressed. Occurrence can be further reduced.

It is a schematic front view of the damper device which concerns on 1st Embodiment of this invention in the fully open state. It is a side view of the damper device which concerns on 1st Embodiment of this invention. It is explanatory drawing of the internal structure of the damper apparatus which concerns on 1st Embodiment of this invention. It is an enlarged view of the main part of the blade in the damper device which concerns on 1st Embodiment of this invention. It is explanatory drawing of arrangement of packing part and noise suppression part in the closed state of the damper device which concerns on 1st Embodiment of this invention. It is explanatory drawing of the micro open state in the damper device which concerns on 1st Embodiment of this invention. It is an open state explanatory drawing with slight contact between the tip of the noise suppression part and the peripheral surface inside the opening frame in the damper device which concerns on 1st Embodiment of this invention. It is an open state explanatory drawing which separated the noise suppression part and the peripheral surface inside the opening frame in the damper device which concerns on 1st Embodiment of this invention. It is explanatory drawing of the internal structure of the damper apparatus which concerns on 2nd Embodiment of this invention. It is an open state explanatory drawing which separated the noise suppression part and the peripheral surface inside the opening frame in the damper device which concerns on 2nd Embodiment of this invention. It is explanatory drawing of the 1st structural example of the packing part and the noise suppression part in the damper apparatus which concerns on another Embodiment of this invention. It is explanatory drawing of the 2nd structural example of the packing part and the noise suppression part in the damper apparatus which concerns on another Embodiment of this invention. It is explanatory drawing of the 3rd structural example of the packing part and the noise suppression part in the damper apparatus which concerns on another Embodiment of this invention. It is explanatory drawing of the 4th structural example of the packing part and the noise suppression part in the damper apparatus which concerns on another Embodiment of this invention. FIG. 5 is an explanatory diagram of a fifth configuration example of a packing portion and a noise suppression portion in the damper device according to another embodiment of the present invention.

(First Embodiment of the present invention)
Hereinafter, the damper device according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8. In this embodiment, an example of a device used as an air change amount adjusting device (VAV) or the like provided in a duct path between an air conditioner and an air outlet arranged facing an indoor space will be described.

In each of the above figures, the damper device 10 according to the present embodiment has a substantially cylindrical opening frame 20 arranged in the middle of a predetermined duct path through which conditioned air flows, and an opening frame 20 with respect to the opening frame 20. A substantially plate-shaped blade 30 attached so as to be tiltable in the inner opening region of the blade 30, a drive mechanism 40 for driving the blade 30 from the outside of the opening frame 20 to enable tilting, and elasticity attached to the outer peripheral edge of the blade 30. The structure includes a packing portion 50 made of a deformable material and a noise suppressing portion 60 arranged in a protruding state on the outer peripheral portion of the packing portion 50.

In the damper device 10 of the present embodiment, the blade 30 is tilted at a predetermined angle with respect to the opening frame 20 from the outside of the opening frame 20 through the drive mechanism 40, and the cylinder of the opening frame 20 which is the direction of air flow in the opening frame 20. By adjusting the opening area in the continuous direction, the amount of conditioned air passing through, that is, the flow rate of conditioned air toward the downstream side is adjusted.

In the air volume adjustment in the damper device 10 having the above configuration, the blade 30 is tilted from the outside of the opening frame 20 via the shaft 31 by the drive mechanism 40, and the opening area in the opening frame 20 is adjusted by changing the angle of the blade 30. It is done by adjusting.

The opening frame body 20 is a substantially cylindrical body made of metal, and has a configuration in which the blades 30 are pivotally supported at two predetermined positions facing each other on the inner peripheral surface. A drive mechanism 40 for tilting the blades 30 is fixedly arranged on the outer surface of the opening frame 20. The opening frame 20 is formed with connecting portions (not shown) with ducts and chambers at both ends, and is arranged in a duct path connected to such ducts and chambers to supply conditioned air. The harmonious air will be circulated.

The blade 30 is formed of a metal disk-like body, and a support shaft 31 is integrally fixed to an intermediate portion, and is arranged so as to be tiltable in an inner opening region of the opening frame 20. More specifically, the blade 30 has a direction perpendicular to the continuous direction of the cylinder of the opening frame 20 by attaching a shaft 31 integrated with the blade 30 to two opposing positions on the peripheral surface of the opening frame. It is pivotally supported by the opening frame 20 so that it can be tilted in an angle range from the closed state to the fully opened state in the direction parallel to the continuous direction of the cylinder of the opening frame 20, and the inner opening region of the opening frame 20 can be opened and closed. Is.

The structure of the opening frame 20 and the blade 30 itself, and the mechanism for axially supporting the blade 30 by the opening frame 20 are the same as those of a known damper device, and detailed description thereof will be omitted.

The drive mechanism 40 is fixed to the outside of the opening frame 20 and is integrally disposed with the opening frame 20, and the output shaft end is connected to an end located outside the opening frame 20 of the shaft 31 of the blade 30. The rotational driving force can be transmitted to the blade 30 side. Specifically, the drive mechanism 40 is a known mechanism such as an electric motor that operates under the control of a predetermined control unit, or a combination thereof and a speed reduction mechanism, and detailed description thereof will be omitted. When the drive mechanism 40 drives the shaft 31, the blades 30 can be tilted by a predetermined angle via the shaft 31.

The packing portion 50 is formed of a material that can be elastically deformed, for example, silicon rubber having a wide usable temperature range such as heat resistance, and is formed in a substantially plate shape, and the outer peripheral edge of the blade 30 is covered with a predetermined range of the outer peripheral edge. In a closed state in which the blade 30 is perpendicular to the continuous cylindrical direction (gas traveling direction) of the opening frame body 20, the blade 30 closes between the blade and the peripheral surface inside the opening frame. Is.

The packing portion 50 has a shape that is larger than the cross section of the inner opening region of the opening frame 20 in the state of being attached to the blade 30 and is expanded outward of the blade, and the noise suppressing portion 60 is in the closed state of the blade 30. The outer predetermined range including the above is bent and deformed so that it can come into contact with the inner peripheral surface of the opening frame 20 without a gap.

The noise suppression portion 60 is made of the same elastically deformable material as the packing portion 50 and is integrally disposed on the outer peripheral portion of the packing portion 50. The noise suppressing portion 60 is formed by a large number of projecting pieces 61 that are arranged and projected in the outer peripheral direction of the blade 30 on the outside of the portion of the packing portion 50 that contacts the peripheral surface of the opening frame body. It protrudes outward from the blades larger than the cross section of the inner opening region, and has the flexibility to be elastically deformed when subjected to the pressure of the conditioned air flowing through the opening frame 20.

The large number of projecting pieces 61 forming the noise suppression portion 60 each form a thin rectangular (strip-shaped) plate piece, and the blade 30 in the packing portion 50 is in contact with the peripheral surface of the opening frame in the closed state. It is configured to be connected to the outside of the packing portion 50 and integrally formed with the packing portion 50. A large number of these projecting pieces 61 are arranged side by side with notches provided at predetermined intervals in the outer peripheral direction of the blade 30 in between, and the noise suppressing portion 60 as a whole is arranged with each projecting piece 61 having the same predetermined width. Is arranged so as to project outward in the radial direction of the blade 30.

Next, the usage state of the damper device based on the above configuration will be described. As a premise, under normal conditions, the flow rate of conditioned air is greatly reduced compared to the fully open state, and the blades are tilted and adjusted within a predetermined angle range from the closed state of the blades, which was relatively easy to generate wind noise with conventional equipment. And.

In the closed state in which the blade 30 is perpendicular to the continuous direction of the cylinder of the opening frame 20, that is, in the state where the opening area of the opening frame 20 is 0, the packing portion 50 at the end of the blade 30 is the inner circumference of the opening frame 20. It adheres to the surface while bending and deforming, and closes the space between the blade 30 and the opening frame body 20. At this time, the noise suppression portion 60 on the outside of the packing portion 50 is also in a state along the inner peripheral surface of the opening frame body 20 according to the deformation of the packing portion 50 (see FIG. 5).

When the blade 30 is slightly tilted from this closed state, the packing portion 50 is separated from the inner peripheral surface of the opening frame body 20, while noise suppression is located outside the packing portion and close to the inner peripheral surface of the opening frame body 20. The portion 60 comes into contact with the inner peripheral surface of the opening frame body 20 while being bent and deformed. However, in the noise suppression unit 60, the conditioned air flows between the blade 30 and the inner peripheral surface of the opening frame 20 by interposing a gap between the protruding pieces 61 (see FIG. 6).

When the blade 30 is tilted a little further, the noise suppressing portion 60 reaches a position where it does not reach the inner peripheral surface of the opening frame 20 in the non-deformed state, but each protruding piece 61 of the noise suppressing portion 60 due to the pressure of the air flow of the harmonized air. Is elastically deformed and slightly bent to the downstream side, so that the noise suppressing portion 60 can come into contact with the inner peripheral surface of the opening frame 20 at a portion of the blade 30 that is displaced to the upstream side in the airflow traveling direction due to tilting ( (See FIG. 7).

As described above, when the conditioned air flows between the blade 30 and the inner peripheral surface of the opening frame body 20, but the noise suppression unit 60 can come into contact with the inner peripheral surface of the opening frame body 20, the opening frame body 20 The edge portion of the blade 30 separated from the inner peripheral surface is not clearly present, and each protruding piece 61 is deformable between the protruding pieces 61 of the noise suppressing portion 60 through which air flows. The air flow makes it difficult for vortices that cause noise to be generated, and noise is also suppressed.

When the blade 30 is further tilted, not only the packing portion 50 but also the noise suppressing portion 60 is completely separated from the inner peripheral surface of the opening frame body 20 (see FIG. 8). Therefore, the opening area of the opening frame 20 in the continuous direction of the cylinder in the opening frame 20 becomes large, and the amount of conditioned air flowing through the opening frame 20 becomes large. In this case, the noise suppression unit 60 is on the blade 30 side with respect to the air flow of the conditioned air traveling downstream along the inner peripheral surface of the opening frame 20 between the blade 30 and the inner peripheral surface of the opening frame 20. It is located near the inner peripheral surface of the opening frame 20 as the most end portion, and a vortex is likely to be generated on the downstream side of the edge of the noise suppression portion 60.

However, each protruding piece 61 of the noise suppressing portion 60 is deformed so as to bend to the downstream side due to the pressure of the air flow of the conditioned air, and the position of the end portion of the protruding piece 61 is difficult to determine. In addition to containing turbulence and occurring as unstable, each protruding piece 61 is separated by a notch and becomes an independent deformed state, so that the generation of vortices for each protruding piece 61 is irregular. The vortices act to cancel each other out. As a result, even if a vortex is generated, the instability of each vortex makes it easy for the vortex to dissipate alone, and the interaction of the vortices promotes the dissipation of the vortex. In this way, by dissipating the vortex in a short time, it is possible to suppress the generation of noise and reduce the noise transmitted to the downstream side.

When the blade 30 is further tilted to bring the blade 30 closer to a fully open state (see FIG. 3) in which the blade 30 is parallel to the continuous direction of the cylinder of the opening frame 20, the opening area of the opening frame 20 in the continuous direction of the cylinder is increased. Since it occupies more than half of the opening frame 20 and the flow rate of the harmonized air traveling downstream becomes large, the influence of the sound generated based on the vortex at the blade end becomes relatively small, and the noise becomes relatively small. It can be ignored as a source.

As described above, in the damper device according to the present embodiment, the packing portion 50 for closing the gap is provided at the end of the damper blade 30, and the noise suppression portion 60 composed of a large number of protruding pieces 61 is provided on the outside of the packing portion 50. When the blades are closed, the packing portion 50 is elastically deformed so that the closed state can be maintained without difficulty, and when the blades 30 are tilted and opened, the noise suppression portion 60 is positioned at the end of the blades 30. Therefore, in the tilt angle range of the blade 30 where wind noise can be generated, the noise suppression unit 60 at the blade end becomes the generation point of the vortex due to the air flow, but the gas at the end of the blade with the flexible noise suppression unit 60. It makes it difficult for the flow to separate, suppresses the generation of vortices, and while deforming due to the pressure of the flowing gas, the flexible noise suppression section 60 that protrudes in large numbers gives irregularity to the generation of vortices and disturbs the vortices. , Complicates and destabilizes the vortex and promotes the dissipation of the vortex. Even if the vortex is generated, it is dissipated in a short time, the generation of sound based on the vortex is suppressed, and the noise transmitted to the downstream side of the duct path is suppressed. Can be reduced.

The damper device according to the above embodiment is configured to be arranged in a duct path for supplying conditioned air as an example of being used for a variable air volume adjusting device (VAV), but is limited to this. Instead, it may be arranged in a duct path for exhaust that sends out the air discharged from the air conditioning target space, and the flow rate of the discharged air may be adjusted.

Further, in the damper device according to the above embodiment, the opening frame body 20 is formed into a cylindrical body and the internal blades 30 are formed into a disk shape, but the present invention is not limited to this, and the opening frame body is not limited to this. In addition to having a square cylinder shape, the blades may be a rectangular or square plate shape corresponding to the opening shape of the opening frame body. In this case, it is sufficient to arrange the packing portion and the noise suppression portion in a straight line only at the tip of the rectangular or square blade, that is, the side portion parallel to the central axis direction of the tilt of the blade. ..

Further, in the damper device according to the above embodiment, the drive mechanism 40 for tilting the blade 30 is an electric motor operated by control or a mechanism in which the electric motor and the deceleration mechanism are combined as an example of being used for the air change amount adjusting device (VAV) or the like. However, it is not limited to this, and in the case of a device applied to applications that do not require automatic control, as a drive mechanism, a manual handle that transmits the operating force from the operator's hand or , It is also possible to use a combination of this and the deceleration mechanism.

Further, in the damper device according to the embodiment, the packing portion 50 is attached to the outer peripheral edge of the blade 30 so as to cover a predetermined range of the outer peripheral edge over both sides of the blade, and is integrated with the outer peripheral edge. However, the packing portion may be integrally attached to one side of the outer peripheral edge portion of the blade by sticking or the like. Further, the noise suppression section 60 is made of the same material as the packing section 50 and is formed integrally with the packing section 50, but the present invention is not limited to this, and the noise suppression section is separate from the packing section. The noise suppression portion may be fixedly arranged on the packing portion by heat welding, adhesion, or the like to be integrated.

(Second Embodiment of the present invention)
In the damper device according to the first embodiment, the blades 30 are formed in a flat plate shape, but as a second embodiment, for example, as shown in FIG. 9, the blades 32 are substantially bowls. It may be formed as a curved surface shape, and the convex side of the curved surface may be arranged toward the upstream side in the gas traveling direction of the opening frame body 22.
Specifically, the blade 32 is assumed to have a substantially bowl-shaped curved surface shape in which the blade center portion is curved so as to be offset in a direction perpendicular to the central axis direction of the blade tilt with respect to the circular blade peripheral edge portion. ..

In this case, in the tilt angle range where the tilt angle from the blade closing position is small and the sound based on the vortex is likely to be generated, the end of the blade 32 on the side displaced upstream due to tilt is based on the curved shape of the blade. , It is oriented toward the downstream side in the gas traveling direction (see FIG. 10). As a result, at the blade end portion that is displaced to the upstream side and is in a state where a vortex is likely to be generated, the traveling direction of air from the center of the blade to the peripheral edge portion along the downstream surface of the blade 32 and the opening frame. The difference from the traveling direction of the air traveling between the opening frame body 22 and the blades 32 along the inner peripheral surface of the body 22 can be reduced, and the air flow near the blade ends can be made smoother. It is possible to suppress the generation of vortex at the blade end based on the above, and it is possible to further reduce the generation of noise due to the vortex.

(Other Embodiments of the present invention)
Further, in the damper device according to the first and second embodiments, a large number of projecting pieces 61 forming the noise suppression unit 60 are formed as elongated rectangular (strip-shaped) thin plate pieces. Alternatively, for example, as shown in FIG. 11, it can also be configured that form the shape of the protruding piece 63 in wider rectangular or square shape, the same embodiments, the independent deformation state each The vortex of each protruding piece cancels out the other vortices, which promotes the dissipation of the vortex and suppresses the generation of noise.

Further, in each of the above-described embodiments, a large number of protruding pieces 61 of the noise suppressing portion 60 are arranged so as to have a notch portion sandwiched in the outer peripheral direction of the blade 30, and each elongated protruding piece 61 having the same predetermined width is a blade. The configuration is such that 30 is formed so as to project outward in the radial direction, but the present invention is not limited to this, and as shown in FIG. 14, only a linear notch 66a along the radial direction of the blade 33 is interposed between the protruding pieces 66. In this way, the projecting pieces 66 may be formed in a substantially fan shape that expands toward the outside, and a large number of projecting pieces 66 may be arranged so as to be closely arranged.

In addition, in each of the above-described embodiments, the large number of projecting pieces 61 forming the noise suppression unit 60 are formed in an arrangement state in which the circular blades 30 project outward in the radial direction, but the present invention is not limited to this. As shown in FIG. 15, the direction of the linear notch (or notch) 67a between the protruding pieces is provided so as to be perpendicular to the central axis of the tilt of the blade 34, and each protruding piece 67 is provided with the direction of the tilt of the blade 34. It is also possible to form the arrangement so as to project in a direction perpendicular to the central axis. In this case, each of the protruding pieces 67 of the noise suppressing portion, which is deformed in contact with the peripheral surface of the opening frame when the blade 34 is tilted, is not involved with the other protruding pieces in a direction perpendicular to the tilting central axis. It can be deformed and bent, resistance is less likely to occur during tilting, and the blade 34 can be tilted smoothly.

10 Damper device 20 Open frame body 21 Bearing part 22 Open frame body 30 Blade 31 Shaft part 32 Blade 33 Blade 34 Blade 40 Drive mechanism 50 Packing part 60 Noise suppression part 61 Projection piece 63 Projection piece 64 Projection piece 65 Projection piece 66 Projection piece 66a Notch 67 Overhanging piece 67a Notch

Claims (3)

A tubular opening frame body that is arranged in a predetermined duct path and allows gas to flow, and a substantially plate-shaped blade that is attached to the opening frame body so as to be tiltable in the inner opening region of the opening frame body, and the above. In a damper device that includes at least a drive mechanism that drives the blades from the outside of the opening frame so that the blades can be tilted, and tilts the blades at a predetermined angle to adjust the opening area inside the opening frame.
Elastic deformation that is attached to the outer peripheral edge of the blade and closes between the outer peripheral edge of the blade and the peripheral surface inside the opening frame in a closed state of the opening region where the blade is perpendicular to the continuous direction of the cylinder of the opening frame. Packing part made of possible material and
It is provided on the outer peripheral portion of the packing portion, and includes a noise suppressing portion that protrudes outward of the blades larger than the cross section of the inner opening region of the opening frame.
The packing portion is expanded outward to the outside of the blade in a state of being attached to the blade, which is larger than the cross section of the inner opening region of the opening frame, and in the closed state, the predetermined range is bent and deformed to the peripheral surface of the opening frame. It is possible to contact without gaps,
The noise suppression portion is made of a flexible material that can be elastically deformed at least under the pressure of a gas flowing through the opening frame, and the blades are outside the portion of the packing portion that contacts the peripheral surface of the opening frame. It is said that a large number of projecting pieces are projected side by side in the outer peripheral direction of the
A damper device in which the projecting pieces are formed in a rectangular shape, a square shape, or a substantially fan shape, and are closely arranged side by side with a narrow substantially linear gap interposed therebetween. In the damper device according to claim 1,
The noise suppression portion is formed integrally with the packing portion by being connected to the outside of the portion of the packing portion that contacts the peripheral surface of the opening frame in the closed state of the blades, and is provided at predetermined intervals in the outer peripheral direction of the blades. A damper device characterized in that a large number of the projecting pieces having a predetermined width are arranged side by side with a linear notch or notch sandwiched between them. In the damper device according to claim 1 or 2,
The blade is formed as a substantially bowl-shaped curved surface shape in which the blade center portion is curved so as to be offset in a direction perpendicular to the central axis direction of the blade tilt with respect to the blade peripheral edge portion, and the convex side of the curved surface is the opening frame. A damper device characterized in that it is arranged toward the upstream side in the gas traveling direction of the body.

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