JP2018013318A - Damper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper device capable of suppressing the generation of vortexes in a blade end part or quickly dissipating generated vortexes to control sound generated by the vortexes, and suppressing the generation of noise.SOLUTION: A damper device is configured such that: a closed state can be retained by providing a packing part 50 in a blade 30 end part, providing a noise suppressing part 60 comprising a large number of projected pieces 61 outside the packing part 50 and elastically deforming the packing part 50 at the time of closing a blade; and on the other hand, in a state of opening the blade 30, due to that the noise suppressing part 60 is positioned at the far-most end of the blade, the generation of vortexes is suppressed in the blade 30 end part having the soft noise suppressing part 60, in a tilting angle range of the blade 30 in which air-blowing sound possibly occurs; and a large number of soft projected pieces 61 of the noise suppressing part 60 give irregularity to the generation of vortexes and disorder vortexes while deforming by pressure of circulating gas, and promotes dissipation of vortexes so as to dissipate generated vortexes in a short time and suppress the generation of sound based on vortexes.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a damper device that is disposed in a duct path for air conditioning and performs control of gas flow and air volume adjustment.

In ducts such as an air supply system that sends conditioned air into a room that is an air conditioning target space or an exhaust system that exhausts air from the room for indoor ventilation or smoke exhaustion, Damper devices were often installed for the purpose of air volume adjustment. In particular, when air conditioning is performed on a relatively large indoor space such as an office space in a building, a variable air volume adjustment device (VAV) provided in a system in which an air conditioner and a plurality of outlets are connected via a duct. ) And the like, and a mechanism for adjusting the temperature of the indoor space to an appropriate temperature by adjusting the amount of air blown from the outlet.
An example of a conventional damper device used for such air conditioning is disclosed in Japanese Patent Application Laid-Open No. 8-327132.

JP-A-8-327132

  As shown in the above-mentioned patent document, the conventional damper device tilts the damper blade around its support shaft to adjust the degree of opening, and the air flow of conditioned air is between the blade and the inner peripheral surface of the opening frame. Many devices (butterfly type) that control the flow rate passing through and downstream are adopted. In such a conventional damper device, the amount of tilting 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 air flow of conditioned air is generated between the blade end and the opening frame. When the flow velocity when passing between the peripheral surfaces increases, vortices are generated at the outer peripheral edge of the blade, and sound is also generated accordingly.

  The sound generated by these blades propagates downstream as a so-called wind noise through the duct, and thus has a problem that it has an adverse effect such as noise spreading to the indoor side of the air-conditioning target.

  The present invention has been made to solve the above-described problems, and can suppress the generation of vortices at the blade end or quickly dissipate the generated vortices to control the sound generated based on the vortices. An object of the present invention is to provide a damper device that can suppress the above-described problem.

  A damper device according to the present invention is a cylindrical opening frame body that is disposed in a predetermined duct path and circulates gas, and is attached to the opening frame body so as to be tiltable in an inner opening region of the opening frame body. It includes at least a blade of a plate-like body and a drive mechanism that can tilt the blade by driving the blade from the outside of the opening frame, and the opening area in the opening frame can be adjusted by tilting the blade by a predetermined angle. In the damper device, the blade is attached to the outer peripheral edge of the blade and closed between the blade outer peripheral edge and the inner peripheral surface of the opening frame in the closed state of the opening region where the blade is perpendicular to the tube continuous direction of the opening frame. A packing portion made of an elastically deformable material, and a noise suppressing portion disposed on the outer peripheral portion of the packing portion and projecting outward from the blade larger than the cross section of the inner opening region of the opening frame body, The packing part is a blade. In the attached state, it is expanded outwardly of the blade larger than the cross section of the inner opening region of the opening frame body, and the outer predetermined range is bent and deformed in the closed state so that it can be contacted without any gap to the inner peripheral surface of the opening frame body, The noise suppression part is made of a flexible material that can be elastically deformed when receiving at least the pressure of the gas flowing through the opening frame, and the blades outside the portion of the packing part that contacts the inner peripheral surface of the opening frame The plurality of protruding pieces are arranged side by side in the outer circumferential direction.

  As described above, according to the present invention, the packing portion that closes the gap is provided at the end portion of the damper blade, and the noise suppression portion that includes a plurality of protruding pieces is provided outside the packing portion, and the packing portion is elastic when the blade is closed. In a state where the closed state can be maintained without difficulty by being deformed and the blade is tilted and opened, the noise suppression unit is positioned at the end of the blade, so that the blade can be generated within the tilt angle range where wind noise can be generated. Although the noise suppression part at the blade end becomes the vortex generation point due to the airflow, it is difficult to cause gas flow separation at the end of the blade with the flexible noise suppression part, and the generation of vortices can be suppressed and many protrusions The flexible noise suppression part deformed by the pressure of the circulating gas, giving irregularities to the generation of vortices and disturbing the vortices, complicating and destabilizing the vortices and promoting the dissipation of the vortices, Short time even if vortices occur And dissipate, suppressed the generation of sound based on the vortex, can reduce the noise transmitted to the downstream side of the duct route.

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

  As described above, according to the present invention, by arranging the projecting pieces forming the noise suppressing portion 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 unit can be arranged on the blades, simplifying the structure of the blades and reducing the manufacturing cost.In addition, even if the noise suppression unit deteriorates due to use, the packing part can be removed from the blades and replaced. Efficiency is also improved.

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

  As described above, according to the present invention, the blade has a substantially bowl-shaped curved shape, and is disposed so that the convex side of the curved surface faces the upstream side in the gas traveling direction, so that the tilt angle of the blade from the closed position is small. In the tilt angle range where sound is likely to be generated, the blade tip on the side displaced upstream by tilting is directed downstream in the gas traveling direction, so that the vortex tends to occur upstream. In the blade end portion, the air travels from the center of the blade toward the edge of the peripheral edge along the downstream surface of the blade and between the opening frame body and the blade along the peripheral surface of the opening frame. The difference from the direction of air travel can be reduced, the air can be smoothly merged in the vicinity of the blade end, and the vortex generation at the blade end based on the air flow can be suppressed, and the noise caused by the vortex can be reduced. Generation can be further reduced.

It is a schematic front view of the fully opened state of the damper device according to the first embodiment of the present invention. It is a side view of the damper device concerning a 1st embodiment of the present invention. It is internal structure explanatory drawing of the damper apparatus which concerns on the 1st Embodiment of this invention. It is a principal part enlarged view of the blade | wing in the damper apparatus which concerns on the 1st Embodiment of this invention. It is arrangement | positioning explanatory drawing of the packing part and noise suppression part in the closed state of the damper apparatus which concerns on the 1st Embodiment of this invention. It is a minute open state explanatory view in the damper device concerning a 1st embodiment of the present invention. It is an open state explanatory view accompanied with slight contact with the noise control part tip in the damper device concerning a 1st embodiment of the present invention, and the perimeter surface of an opening frame. It is an open state explanatory view in which the noise suppression part and the perimeter surface in an opening frame in the damper device concerning a 1st embodiment of the present invention were separated. It is internal structure explanatory drawing of the damper apparatus which concerns on the 2nd Embodiment of this invention. It is an open state explanatory view in which the noise suppression unit and the inner peripheral surface of the opening frame are separated from each other in the damper device according to the second embodiment of the present invention. It is a 1st structural example explanatory drawing of the packing part in the damper apparatus which concerns on other embodiment of this invention, and a noise suppression part. It is 2nd structural example explanatory drawing of the packing part in the damper apparatus which concerns on other embodiment of this invention, and a noise suppression part. It is explanatory drawing of the 3rd structural example of the packing part and noise suppression part in the damper apparatus which concerns on other embodiment of this invention. It is explanatory drawing of the 4th structural example of the packing part in the damper apparatus which concerns on other embodiment of this invention, and a noise suppression part. It is explanatory drawing of the 5th structural example of the packing part in the damper apparatus which concerns on other embodiment of this invention, and a noise suppression part.

(First embodiment of the present invention)
Hereinafter, a damper device according to a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an example of a device used as a variable air flow rate adjustment device (VAV) provided in a duct path between an air conditioner and an air outlet disposed facing an indoor space will be described.

  In each of the drawings, a damper device 10 according to the present embodiment includes a substantially cylindrical opening frame body 20 disposed in the middle of a predetermined duct path through which conditioned air is circulated, and an opening frame body with respect to the opening frame body 20. A substantially plate-like blade 30 attached to be able to tilt in the inner opening region of the blade, a drive mechanism 40 that can be tilted by driving the blade 30 from the outside of the opening frame 20, and an elasticity attached to the outer peripheral edge of the blade 30. The packing portion 50 is made of a deformable material, and the noise suppressing portion 60 is provided 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 with respect to the opening frame 20 by a predetermined angle from the outside of the opening frame 20 through the drive mechanism 40, and the cylinder of the opening frame 20 that is the air flow traveling direction in the opening frame 20. By adjusting the opening area in the continuous direction, it is a mechanism for adjusting the passing amount of conditioned air, that is, the flow rate of conditioned air toward the downstream side.

  The air volume adjustment in the damper device 10 having the above-described configuration is performed by tilting the blade 30 via the shaft 31 from the outside of the opening frame body 20 through the shaft 31 from the outside of the opening frame body 20 and changing the angle of the blade 30 to reduce the opening area in the opening frame body 20. This is done by adjusting.

  The said opening frame 20 is a metal substantially cylindrical body, and is the structure which supports the blade | wing 30 so that tilting is possible in two predetermined locations which an internal peripheral surface opposes. A drive mechanism 40 that tilts the blade 30 is fixedly disposed on the outer surface of the opening frame 20. The opening frame body 20 is formed with a duct (chamber) connection portion (not shown) at both ends, and is disposed in a duct path connected to such a duct or chamber for supplying conditioned air. Harmonized air will be distributed.

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

  The structures of the opening frame body 20 and the blades 30 themselves and the mechanism for pivotally supporting the blades 30 with the opening frame body 20 are the same as those of a known damper device, and detailed description thereof is omitted.

  The drive mechanism 40 is fixed to the outside of the opening frame body 20 and is integrally disposed with the opening frame body 20, and the output shaft end is connected to the end portion of the shaft 31 of the blade 30 positioned outside the opening frame body 20, 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 of this and a speed reduction mechanism, and detailed description thereof is omitted. The drive mechanism 40 drives the shaft 31 to tilt the blade 30 through the shaft 31 by a predetermined angle.

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

  The packing part 50 has a shape that is larger than the transverse cross section of the inner opening region of the opening frame 20 in the attached state to the blades 30 and extends outward from the blades, and the noise suppressing unit 60 in the closed state of the blades 30. The outer predetermined range including the bend is deformed and can contact the inner peripheral surface of the opening frame 20 without a gap.

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

  A large number of protruding pieces 61 constituting the noise suppressing portion 60 are each formed into an elongated rectangular (strip-shaped) thin plate piece, and a portion of the packing portion 50 that contacts the inner peripheral surface of the opening frame in the closed state. It is the structure connected with the outer side of this and formed integrally with the packing part 50. A large number of these protruding pieces 61 are arranged in the outer circumferential direction of the blade 30 with a notch provided at a predetermined interval, and the protruding pieces 61 having the same predetermined width as the noise suppression unit 60 as a whole. Is arranged in a state of protruding 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, in a normal situation, the flow rate of the conditioned air is greatly reduced with respect to the fully opened state, and the blade is tilted and adjusted within a predetermined angle range from the closed state of the blade, which is relatively easy to generate wind noise with the conventional device. And

  In the closed state in which the blades 30 are in a direction perpendicular to the cylindrical continuous direction of the opening frame body 20, that is, in the state of the opening area of the opening frame body 20, the packing portion 50 at the end of the blade 30 is the inner periphery of the opening frame body 20. It closely adheres to the surface while being bent, and closes between the blade 30 and the opening frame 20. At this time, the noise suppression part 60 outside the packing part 50 is also in a state along the inner peripheral surface of the opening frame body 20 according to the deformation of the packing part 50 (see FIG. 5).

  In a state where the blades 30 are slightly tilted from the closed state, the noise is suppressed while the packing part 50 is separated from the inner peripheral surface of the opening frame body 20 and close to the inner peripheral surface of the opening frame body 20 outside the packing part. The part 60 contacts the inner peripheral surface of the opening frame 20 while being bent and deformed. However, in the noise suppression unit 60, conditioned air is circulated between the blades 30 and the inner peripheral surface of the opening frame body 20 because a gap is interposed between the protruding pieces 61 (see FIG. 6).

  When the blade 30 is further tilted a little, the noise suppression unit 60 reaches a position that 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 suppression unit 60 is caused by the pressure of the conditioned air flow. Is elastically deformed and slightly bends downstream, so that the noise suppressing portion 60 can contact the inner peripheral surface of the opening frame 20 at a portion of the blade 30 that is tilted and displaced upstream in the airflow traveling direction ( (See FIG. 7).

  Although the conditioned air flows between the blade 30 and the inner peripheral surface of the opening frame body 20 as described above, when the noise suppression unit 60 can contact the inner peripheral surface of the opening frame body 20, Since the edge part of the blade | wing 30 away from the internal peripheral surface does not exist clearly, and since each protrusion piece 61 can deform | transform between each protrusion piece 61 of the noise suppression part 60 through which air distribute | circulates, it is harmony Vortices that cause noise are less likely to occur due to airflow, and noise can be suppressed.

  When the blade 30 is further tilted, not only the packing part 50 but also the noise suppressing part 60 is completely separated from the inner peripheral surface of the opening frame 20 (see FIG. 8). For this reason, the opening area in the cylinder continuous direction of this opening frame body 20 in the opening frame body 20 becomes large, and the circulation amount of conditioned air becomes large. In this case, the noise suppression unit 60 is disposed between the blade 30 and the inner peripheral surface of the opening frame body 20 against the air flow of conditioned air that travels downstream along the inner peripheral surface of the opening frame body 20. It is located near the inner peripheral surface of the opening frame 20 as the endmost part, and a vortex is likely to occur on the downstream side of the edge of the noise suppressing portion 60.

  However, each protruding piece 61 of the noise suppression unit 60 is deformed so as to bend to the downstream side by the pressure of the conditioned air flow, and the end position of the protruding piece 61 is difficult to be determined. In addition to the occurrence of unstable turbulence, each projecting piece 61 is separated by a notch and is in an independently deformed state. Therefore, the generation of vortices for each projecting piece 61 is irregular. The vortices act to cancel each other out of the other vortices. Thus, even if a vortex is generated, the instability of each vortex is easy to dissipate even with the vortex alone, and the dissipation of the vortex is promoted by the interaction of the vortices. Thus, since the vortex can be dissipated in a short time, the generation of noise can be suppressed and the noise transmitted downstream can be reduced.

  In addition, when the blade 30 is further tilted so that the blade 30 approaches a fully open state (see FIG. 3) that is parallel to the cylinder continuous direction of the opening frame body 20, the opening area of the opening frame body 20 in the tube continuous direction is Since the flow rate of conditioned air that travels to the downstream side becomes larger than half of the opening frame 20, the influence of the sound generated based on the vortex at the blade end becomes relatively small, and the noise It can be ignored as a source.

  As described above, in the damper device according to the present embodiment, the packing portion 50 that closes the gap is provided at the end of the blade 30 of the damper, and the noise suppressing portion 60 that includes a plurality of protruding pieces 61 is provided outside the packing portion 50. When the blades are closed, the packing part 50 is elastically deformed so that the closed state can be maintained without difficulty. In addition, when the blades 30 are tilted and opened, the noise suppression unit 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 a 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 exists. It is difficult to cause flow separation, and the generation of vortices can be suppressed, and a large number of protruding flexible noise suppression parts 60 can be deformed by the pressure of the circulating gas, giving irregularities to the generation of vortices and disturbing the vortices. The vortex is complicated and destabilized, facilitating the dissipation of the vortex, and even if a vortex occurs, it can be dissipated in a short time to suppress the generation of sound based on the vortex, and the noise transmitted downstream of the duct path can be reduced. Can be reduced.

  In addition, in the damper device according to the embodiment, as an example used for a variable air flow rate adjustment device (VAV) or the like, the damper device is arranged in a duct path for supplying conditioned air, but is not limited thereto. Instead, it is also possible to adopt a configuration in which the flow rate of the exhaust air is adjusted by being disposed in a duct route for exhaust that sends out the air discharged from the air conditioning target space.

  Further, in the damper device according to the embodiment, the opening frame body 20 is a cylindrical body and the inner blades 30 are disk-shaped, but the present invention is not limited to this, and the opening frame body is not limited to this. In addition to the rectangular tube shape, the blade may be a rectangular or rectangular plate-like body corresponding to the opening shape of the opening frame. In this case, it is sufficient to arrange the packing part and the noise suppressing part in a linear shape only at the tip of the rectangular or rectangular blade, that is, the side portion parallel to the central axis direction of the blade tilt. .

  In the damper device according to the embodiment, the drive mechanism 40 that tilts the blade 30 is, for example, a motor that is operated by control or a mechanism that combines a motor and a speed reduction mechanism, as an example of use in a variable air volume adjustment device (VAV). However, the present invention is not limited to this, and in the case of a device that is applied to an application that does not require automatic control, as a drive mechanism, a manual handle that transmits an operation force from the operator's hand or A combination of this and a speed reduction mechanism may be used.

  Further, in the damper device according to the embodiment, the packing unit 50 is attached and integrated with the outer peripheral edge of the blade 30 so as to cover the outer peripheral predetermined range over both surfaces of the blade. Not limited to this, the packing portion may be integrally attached to one side of the outer peripheral edge of the blade by pasting or the like. Moreover, although the noise suppression part 60 is made from the same material as the packing part 50, and is formed integrally with the packing part 50, it is not limited to this, and the noise suppression part is separated from the packing part. In addition, the noise suppression unit may be fixedly disposed on the packing unit by heat welding, bonding, 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. In addition, as a second embodiment, for example, as shown in FIG. It is also possible to adopt a configuration in which a curved surface shape is formed and the convex side of the curved surface is disposed toward the upstream side in the gas traveling direction of the opening frame body 22.
Specifically, the blade 32 has a substantially bowl-shaped curved surface that is curved so as to shift the blade central portion in a direction perpendicular to the central axis direction of the blade tilt with respect to the circular blade peripheral portion. .

  In this case, the end of the blade 32 on the side displaced to the upstream side by tilting in the tilt angle range where the tilt angle from the closed position of the blade is small and vortex-based sound is likely to be generated is based on the curved surface shape of the blade. The gas is directed downstream in the gas traveling direction (see FIG. 10). Thereby, in the blade end portion that is in a state where the vortex is easily generated by being displaced upstream, the traveling direction of the air from the center of the blade toward the peripheral end portion along the downstream surface of the blade 32, and the opening frame The difference between 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 can be smoothly merged in the vicinity of the blade end portion, Therefore, it is possible to suppress the generation of vortex at the blade tip based on the vortex, and the generation of noise based on the vortex can be further reduced.

(Other embodiments of the present invention)
Further, in the damper device according to the first and second embodiments, a large number of protruding pieces 61 forming the noise suppressing unit 60 are formed as thin plate pieces having an elongated rectangular shape (strip shape). For example, as shown in FIG. 11, the protruding piece 63 is formed in a wider rectangular or rectangular shape, as shown in FIG. 11, or as shown in FIG. 12, the protruding piece 64 is formed in a sine wave shape, Further, as shown in FIG. 13, the projecting piece 65 may be formed in a triangular shape, and the vortex for each projecting piece that is in an independently deformed state cancels other vortices as in the above-described embodiments. This helps dissipate the vortex and suppress the generation of noise.

  Moreover, in each said embodiment, many protrusion pieces 61 of the noise suppression part 60 are put in order so that a notch part may be pinched | interposed in the outer peripheral direction of the blade | wing 30, and each elongated protrusion piece 61 of the same predetermined width | variety is a blade | wing. However, the present invention is not limited to this, and as shown in FIG. 14, only a linear notch 66 a along the radial direction of the blade 33 is interposed between the protruding pieces 66. In this manner, the protruding pieces 66 may be formed in a substantially fan shape that expands toward the outside, and a large number of protruding pieces 66 may be arranged so as to be closely arranged.

  In addition, in each said embodiment, it is set as the structure formed in the arrangement | positioning state which protrudes to the radial direction outward of the circular blade | wing 30 although the many protrusion pieces 61 which make the noise suppression part 60 are not restricted to this, FIG. As shown in FIG. 15, the direction of the linear cuts (or notches) 67 a between the projecting pieces is provided as a direction perpendicular to the central axis of the tilt of the blades 34, and each projecting piece 67 is provided for the tilt of the blades 34. It can also be set as the arrangement | positioning which protrudes in the direction which becomes a right angle with a central axis. In this case, when the blades 34 are tilted, the projecting pieces 67 of the noise suppressing portion that are deformed in contact with the inner peripheral surface of the opening frame are not associated with other projecting pieces in a direction perpendicular to the tilting central axis. It can be deformed and bent, resistance is hardly generated during tilting, and the blades 34 can be tilted smoothly.

DESCRIPTION OF SYMBOLS 10 Damper apparatus 20 Opening frame body 21 Bearing part 22 Opening frame body 30 Vane 31 Shaft part 32 Vane 33 Vane 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 cut 67 projecting piece 67a cut

Claims (3)

A cylindrical opening frame body that is arranged in a predetermined duct path and circulates gas; a substantially plate-like blade attached to the opening frame body so as to be tiltable in an inner opening region of the opening frame body; A damper mechanism that at least includes a drive mechanism that allows the blades to be tilted by driving the blades from the outside of the opening frame, and allows the opening area in the opening frame to be adjusted by tilting the blades by a predetermined angle;
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 inner peripheral surface of the opening frame in a closed state of the opening region where the blade is perpendicular to the cylinder continuous direction of the opening frame. Packing parts made of possible materials,
A noise suppression part disposed on the outer periphery of the packing part and protruding outward from the blade larger than the cross section of the inner opening region of the opening frame,
The packing portion is expanded to the outside of the blade larger than the cross section of the inner opening area of the opening frame body in the attached state to the blade, and a predetermined outer side is bent and deformed in the closed state on the inner peripheral surface of the opening frame. It is possible to contact without gaps,
The noise suppression part is made of a flexible material that can be elastically deformed when receiving at least the pressure of the gas flowing through the opening frame, and the blades outside the portion of the packing part that contacts the inner peripheral surface of the opening frame The damper device is characterized in that it is a large number of projecting pieces that are juxtaposed in the outer peripheral direction of each of the two. The damper device according to claim 1,
The noise suppression part is formed integrally with the packing part by being connected to the outside of a part of the packing part that contacts the inner peripheral surface of the opening frame in the closed state of the blades, and is provided at a predetermined interval in the outer circumferential direction of the blades. A damper device characterized in that a large number of the protruding pieces having a predetermined width are arranged side by side while sandwiching a linear cut or notch therebetween. In the damper device according to claim 1 or 2,
The blade is formed as a substantially bowl-shaped curved surface curved so as to shift the blade central portion with respect to the blade peripheral portion in a direction perpendicular to the central axis direction of the blade tilt, and the convex side of the curved surface is the opening frame. A damper device, wherein the damper device is disposed toward an upstream side in a gas traveling direction of the body.

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