JP6430316B2 - Flow control damper - Google Patents

Description

  The present invention relates to a flow rate adjusting damper that is used by being connected to a duct as an adjusting means for the amount of air flowing through the duct that constructs an air supply and exhaust system for various buildings.

  As shown in FIG. 10, as a method for measuring the air volume (air velocity) of air passing through a flow rate adjusting damper 200 having an opening / closing blade 202 in the damper casing 201, pressure measurement is performed on the upstream side and the downstream side in the damper casing 201, respectively. There is a method of providing the ports 203 and 204 and calculating the air volume (wind speed) based on the differential pressure between the pressure measurement value at the upstream pressure measurement port 203 and the pressure measurement value at the downstream pressure measurement port 204.

  The flow rate adjusting damper 200 provided for this method has a simple structure and does not require actual flow verification. Therefore, when the flow of air in the damper casing 201 is stable (ideal flow). Can suitably measure the air volume.

  On the other hand, as a prior art related to the present invention, for example, there is a “flow control damper” described in Patent Document 1. The “flow control damper” includes a casing that is connected to a duct to form a fluid flow path, and a plurality of movable blades that are rotatably disposed in the casing to change the opening degree of the flow path in the casing. And a guide member disposed on the inner surface of the casing for guiding the fluid to the movable blade, and a derivative that spreads the fluid downstream of the movable blade and suppresses the generation of vortices.

Japanese Patent Laid-Open No. 2015-21625

  As described above, the flow rate adjusting damper 200 shown in FIG. 10 accurately measures the air volume based on the detected pressure when the air flow in the damper casing 201 is stable (ideal flow). It can be done. However, in reality, as shown in FIG. 10, turbulent flow T is generated in a region downstream of the opening / closing blade 202 in the damper casing 201, and wind flows near the pressure measurement port 204 on the downstream side. May occur, or the pressure measurement value at the downstream pressure measurement port 204 may be larger than the pressure measurement value at the upstream pressure measurement port 203, which may hinder the differential pressure measurement. . In particular, when controlling the blade opening from the relationship between the detected differential pressure and air volume, blade opening, pressure, etc., there is a gap between the required air flow and the actual air flow, which may hinder air conditioning control. is there.

  On the other hand, the “flow rate control damper” described in Patent Document 1 is excellent in terms of excellent flow rate controllability and reduced pressure loss, but measures pressure on the upstream side and downstream side in the casing. It has no function.

  Therefore, the problem to be solved by the present invention is that it is difficult to be affected by the turbulence of the air flow in the air conditioning duct, eliminates the instability of the air flow in a state where the flow path is almost fully closed, and stably measures the differential pressure. An object of the present invention is to provide a flow rate adjusting damper capable of performing the above.

  The flow rate adjusting damper according to the present invention includes a rectangular cylindrical damper casing, a plurality of rotating shafts provided in a direction transverse to the inside of the damper casing, and a leading edge portion at least with respect to the airflow direction by the rotation of the rotating shaft. And a plurality of blade members arranged so as to be close to each other and can be separated from each other, and an air flow of the blade members is formed so as to form a holding position when the blade members are fully opened on the inner peripheral surface of the damper casing. Frame members respectively disposed on the upstream side and the downstream side with respect to the flow direction, and pressure detection units respectively disposed on the upstream side and the downstream side with respect to the flow direction of the airflow of the blade member on the inner peripheral surface of the damper casing. And a partition member that crosses the damper casing is provided in a region where the blade member in the damper casing approaches and separates.

  In the flow rate adjustment damper having such a configuration, the air flow disturbance in the downstream region of the blade member that has passed through the plurality of blade members arranged in the facing posture can be suppressed by the partition member. In particular, when the flow path in the damper casing is narrowed by approaching the front edge portion of the blade member, the airflow flowing through the gap between the opposed blade members starts to flow along the intermediate partition member, to the back side of the blade member Therefore, it is possible to prevent turbulence of the air flow such as a drift due to the air flow sticking, and to stably measure the pressure on the downstream side.

  Here, it is desirable to dispose a pressure detection unit on the downstream side with respect to the airflow direction of the blade member in a region covered with the frame member arranged on the downstream side with respect to the airflow direction of the blade member.

  With such a configuration, since the downstream pressure detection unit with respect to the airflow direction is covered with the frame member, adverse effects on the pressure detection unit due to the turbulence of the downstream airflow can be suppressed. This is effective for stabilizing the pressure measurement on the downstream side.

  In this case, the intermediate partition member has a wing shape including a flat portion extending forward and backward with respect to the airflow direction, and the thickness thereof is from the front edge portion to the rear edge portion with respect to the airflow direction. After continuously increasing, it continuously decreases through the maximum thickness portion, and the maximum thickness portion is provided closer to the front edge than the center line in the front-rear direction of the inner partition member. It is desirable to be.

  With such a configuration, the airflows flowing in the gaps between the opposing blade member and the intermediate partition member are difficult to separate from the surface of the intermediate partition member, and the rectifying action by the intermediate partition member is enhanced, so the downstream pressure An adverse effect on the detection unit is suppressed, which is effective for stabilizing pressure detection on the downstream side. Moreover, since airflow is stabilized, the pressure loss of a damper main body can be reduced.

  In addition, it is desirable to provide flat portions extending forward and rearward of the middle partition member along the front edge portion and the rear edge portion of the middle partition member with respect to the airflow direction.

  With such a configuration, the function of partitioning the region in the damper casing up and down is enhanced, and the upstream plane portion is an air flow between the plane portion when the blades are in the closing direction and the front edge portion of the middle partition member. The downstream plane portion can rectify the airflow downstream of the partition member.

  Furthermore, it is desirable to provide a ridge part along the longitudinal direction on the downstream side of the front edge of the blade member with respect to the airflow direction.

  When the flow path is squeezed to close to close and the space between the partition member and the front edge of the blade member becomes narrow, the airflow flowing at high speed in this flow path becomes very unstable, depending on the turbulence The airflow does not flow along the surface of the partition member, but may adhere to the back side of the blade member and flow largely unevenly, but as described above, a protrusion is provided on the downstream side of the front edge portion of the blade member. If this is the case, the protruding portion becomes a peeling start portion where the air flow begins to peel from the front edge portion of the blade member, prevents the bias of the air flow to the back side of the blade member, and partitions the air flow separated from the blade member Since it can be guided to the surface of each member, it is effective for stabilizing pressure measurement on the downstream side. In addition, although a protrusion part may be provided continuously in a longitudinal direction, it is good also as discontinuity.

  In this case, the cross-sectional shape of the protruding portion may be a triangle.

  With such a configuration, it is possible to enhance the peeling action of the airflow from the blade member and the guiding action to the partition member by the protrusions.

  In addition, it is desirable to provide a cover that covers the downstream side of the air flow direction of the pressure detection unit on the upstream side of the air flow direction.

  With such a configuration, the upstream pressure detection unit can appropriately guide the upstream air flow to the pressure detection unit, so that the upstream pressure can be reliably detected.

  According to the present invention, a flow rate adjustment damper that is less susceptible to the turbulence of the airflow in the air conditioning duct, eliminates the instability of the airflow when the flow path is almost fully closed, and can stably measure the differential pressure. I will provide a.

It is a perspective view which shows the flow volume adjustment damper which is embodiment of this invention. It is the figure seen from the arrow A direction in FIG. It is the figure seen from the arrow B direction in FIG. It is the figure seen from the arrow C direction in FIG. It is sectional drawing in the DD line in FIG. FIG. 6 is an enlarged cross-sectional view illustrating a state in which a front edge portion of a blade member is close in the flow rate adjustment damper illustrated in FIG. 5. It is sectional drawing for demonstrating the function of the partition member shown in FIG. It is sectional drawing for demonstrating the function of the protrusion part shown in FIG. It is a graph which shows the relationship between the angle of a blade member, and a damper front-back differential pressure. It is a figure which shows typically the conventional flow volume adjustment damper provided with the differential pressure measurement function.

  Hereinafter, based on FIGS. 1-8, the flow volume adjustment damper 100 which is embodiment of this invention is demonstrated. In addition, the arrow W described in FIGS. 1-3, FIG.5 and FIG.6 has shown the flow direction of the airflow with respect to the flow volume adjustment damper 100, and the direction which the arrow W shows is downstream (back side, The rear side) and the opposite side 180 degrees are the upstream side (front side, front side), and the right side and the left side in the direction indicated by the arrow W.

  As shown in FIGS. 1 to 6, the flow rate adjustment damper 100 of the present embodiment is provided in a direction that crosses the damper casing 10 and a rectangular cylindrical damper casing 10 that is open at both ends and has a flow path therein. The two rotating shafts 11, 12 and a plurality of blade members 21, 22 arranged so that at least the front edge portions 21 a, 22 a can approach and separate from each other by the rotation of the rotating shafts 11, 12. Frame members 31, 32, 33, arranged on the upstream side and the downstream side of the blade members 21, 22, respectively, so as to form a fully opened holding position of the blade members 21, 22 on the inner peripheral surface of the damper casing 10. 34, and pressure detectors 40, 50, 60 disposed on the upstream side and the downstream side of the blade members 21, 22 on the inner peripheral surface of the damper casing 10, respectively. A blade-shaped intermediate partition member 70 that crosses the damper casing 10 is provided in a region where the blade members 21 and 22 in the damper casing 10 approach and separate from each other.

  The pressure detectors 40, 50, 60 are each formed by providing a small hole in the damper casing 10, and connecting tools 41, 51, 61 projecting outside the damper casing 10 are attached thereto. A tubular body (not shown) that communicates with a pressure sensor (not shown) can be connected to the connectors 41, 51, 61.

  A control box 80 is integrally provided on the side surface of the damper casing 10, and a motor, a controller, a power supply unit (none of which are not shown), and the like that rotate the rotary shafts 11 and 12 are accommodated in the control box 80. ing. The two rotary shafts 11 and 12 are arranged so as to be parallel to each other along the direction transverse to the inside of the damper casing 10, and the ends of the two rotary shafts 11 and 12 are linked on the outer surface of the damper casing 10. The front edges of the blade members 21 and 22 are configured to approach and separate via a mechanism (not shown).

  As shown in FIGS. 4 and 5, fan plate members 25 and 26 are attached to portions near the both ends of the rotating shafts 11 and 12 (portions approaching the inner peripheral surface of the damper casing 10), respectively. The blade members 21 and 22 are attached to the outer peripheral portion of the H. 26 in a posture that crosses the damper casing 10. The front edge portions 21a and 22a of the blade members 21 and 22 have a smooth convex curved surface shape, and the rear edge portions 21b and 22b have a sharp edge shape.

  As shown in FIG. 5, the flow path is closed by simultaneously rotating the blade member 21 counterclockwise with respect to the upstream side and the blade member 22 clockwise with respect to the upstream side. Further, the flow path is opened by simultaneously rotating the blade member 21 so as to rotate clockwise with respect to the upstream side and the blade member 22 counterclockwise with respect to the upstream side.

  Packings 27 and 28 are provided on the peripheral edge portions of the front edge portions 31a and 32a of the frame members 31 and 32, respectively, and are always in contact with the blade members 21 and 22, so that the frame members 31 and 32 and the blade member 21 and The airtightness of the gap with 22 is improved, and the accuracy of the flow rate measurement is improved. In addition, packings 29 and 30 are provided in the gaps between both ends of the blade members 21 and 22 and the damper casing 10 to improve the airtightness when the flow path is fully closed. The packings 29, 30 are provided at both ends of the blade members 21, 22 with substantially the same curvature as the outer peripheral surfaces 21 c, 22 c, and are always in contact with the inner surface of the damper casing 10.

  As shown in FIG. 5, the outer peripheral surfaces 21c and 22c (surfaces far from the rotating shafts 11 and 12) of the blade members 21 and 22 have a smooth convex curved surface shape corresponding to a part of the outer peripheral surface of the cylinder. Yes. The inner peripheral surfaces (surfaces closer to the rotating shafts 11 and 12) of the blade members 21 and 22 are smooth convex curved portions from the front edge portions 21a and 22a to the vicinity of the center (near the middle of the length in the front-rear direction). The shape is formed, and the portion from the vicinity of the center to the rear edge portions 21b and 22b has a planar shape. On the downstream side of the front edge portions 21a and 22a of the blade members 21 and 22, ridge portions 23 and 24 are provided along the longitudinal direction thereof. As shown in FIG. 6, the cross-sectional shape of the protrusions 23 and 24 is a triangle.

  Further, as shown in FIG. 5, when the blade members 21, 22 are in a fully open state (the front edge portions 21 a, 21 b of the blade members 21, 22 are most separated from each other and are closest to the inner peripheral surface of the damper casing 10). Frame members 31, 32, 33, and 34 are disposed on the upstream side and the downstream side of the blade members 21 and 22, respectively, on the inner peripheral surface of the damper casing 10.

  The front edge part surfaces 31a and 32a of the frame members 31 and 32 and the rear edge part surfaces 33a and 34a of the frame members 33 and 34 each have a smooth convex curved surface shape, and form a cavity inside. Further, the rear edge side surfaces 31b, 32b of the frame members 31, 32 and the front edge side surfaces 33b, 34b of the frame members 33, 34 are smooth concave curved surfaces having substantially the same curvature as the outer peripheral surfaces 21c, 22c of the blade members 21, 22, respectively. I am doing. Downstream pressure detectors 50 and 60 are arranged in a region covered with the frame members 33 and 34 arranged on the downstream side, and both ends of the frame members 31, 32, 33 and 34 and the inside of the damper casing 10. A gap is provided between the side surfaces.

  The pressure detection units 50 and 60 are provided on the downstream side of the blade members 21 and 22, respectively, on the upper and lower surfaces of the inner peripheral surface of the damper casing 10 and in the substantially central portion in the width direction. The pressure on the downstream side of the blade members 21, 22 passes through the gaps between both end portions of the frame members 31, 32, 33, 34 and the inner surface of the damper casing 10, and the inside of the frame members 31, 32, 33, 34. The airflow flowing into the hollow portion of the airflow is detected at two locations of the pressure detectors 50 and 60, and the airflow passing through the flow control damper 100 is measured using a value obtained by averaging the detected pressures, so that the airflow measurement accuracy And the effects of air turbulence are reduced.

  Further, as shown in FIG. 5, the upstream pressure detector 40 is provided with a cover 42 that covers the downstream side thereof. The cover 42 is a folding screen-shaped member that opens in a V shape toward the upstream side. In this embodiment, a flat plate bent at a right angle is formed on the inner peripheral surface of the damper casing 10 on the downstream side of the pressure detection unit 40. It is formed by adhering. By providing the cover 42, it is possible to appropriately guide the upstream airflow to the pressure detection unit 40 in the upstream pressure detection unit 40, and thus it is possible to reliably detect the upstream pressure. For the same reason as the pressure detection units 50 and 60, the pressure detection unit 40 is also provided on the upper right side and the lower left side of the inner peripheral surface of the damper casing 10 on the upstream side of the blade members 21 and 22.

  As shown in FIG. 5, when the rotating shafts 11 and 12 are rotated forward and reverse by motor driving, the blade members 21 and 22 rotate around the rotating shafts 11 and 12, and the front edge portions 21a and 21a of the blade members 21 and 22 are rotated. When 22a approaches and separates, the gas flow path in the damper casing 10 is closed or opened, thereby exhibiting a flow rate adjusting function. By making the cross-sectional shape of the blade members 21 and 22 as described above, a proportional characteristic can be provided between the blade angle and the flow rate.

  The middle partition member 70 is arranged at a portion spaced from the two rotary shafts 11 and 12 at equal intervals so as to be parallel to the rotary shafts 11 and 12. The intermediate partition member 70 continuously increases in thickness from the front edge portion 70a toward the rear edge portion 70b while forming a smooth convex curved surface, and then passes through the maximum thickness portion toward the rear edge portion 70b. The wing shape is continuously reduced in a wedge shape. The maximum thickness portion of the middle partition member 70 is provided closer to the front edge portion 70 a than the center line 70 c in the front-rear direction of the middle partition member 70. Planar portions 71 and 72 extending forward and rearward of the middle partition member 70 along the front edge portion 70a and the rear edge portion 70b of the middle partition member 70 are provided. In addition, although the partition member 70 can also be made into flat plate shape, it is suitable to make it a wing | blade shape like this embodiment from the side of a rectification effect or intensity | strength.

  The upstream plane portion 71 of the intermediate partition member 70 is located at a portion where the front edge portions 21a and 22a of the blade members 21 and 22 abut when the blade members 21 and 22 are fully closed, and the downstream plane portion 72. Is located downstream of the rotary shafts 11 and 12 and upstream of the blade members 21 and 22, and both are disposed downstream of the pressure detector 40 and upstream of the pressure detectors 50 and 60.

  Here, based on FIG. 7, the function of the partition member 70 is demonstrated. As shown in FIG. 7, the flow rate adjusting damper 100 includes a partition member 70 in the damper casing 10, and therefore, between the two blade members 21 and 22 and the partition member 70 arranged in an opposing posture. It is possible to prevent the airflow that has passed through the air from being disturbed in the downstream region of the blade members 21 and 22.

  In particular, when the front edge portions 21a and 22a of the blade members 21 and 22 are brought close to each other and the flow path in the damper casing 10 is narrowed, the airflow flowing through the gap between the opposed blade members 21 and 22 and the partition member 70 is generated. Since each flows along the surface of the partition member 70, it is possible to prevent the airflow from sticking to the back sides (inner peripheral surfaces 21d, 22d) of the blade members 21, 22. In addition, since it is possible to prevent turbulence of airflow such as drift due to sticking of airflow to the inner peripheral surfaces 21d and 22d of the blade members 21 and 22, pressure measurement by the pressure detection units 50 and 60 on the downstream side can be performed. It can be performed stably.

  Moreover, since the pressure detection parts 50 and 60 are arrange | positioned in the area | region covered with the frame members 33 and 34 arrange | positioned downstream, the bad influence of the turbulent flow with respect to the downstream pressure detection parts 50 and 60 is suppressed. This is effective for stabilizing pressure measurement on the downstream side.

  As described above, the thickness of the partition member 70 continuously increases from the front edge portion 70a toward the rear edge portion 70b, and then continuously decreases through the maximum thickness portion, and the maximum thickness portion is reduced. The middle partition member 70 is provided closer to the front edge portion 70a than the center line 70c in the front-rear direction. This makes it difficult for the airflows flowing through the gaps between the opposing blade members 21 and 22 and the partition member 70 to separate from the surface of the partition member 70, and the rectifying action by the partition member 70 is increased. The adverse effect on the pressure detectors 50 and 60 is suppressed, and is effective for stabilizing pressure detection on the downstream side. Moreover, since the airflow is stabilized, the pressure loss of the main body of the flow rate adjustment damper 100 can be reduced.

  The intermediate partition member 70 is provided with flat portions 71 and 72 extending forward and rearward of the intermediate partition member 70 along the front edge portion 70a and the rear edge portion 70b, respectively. The function of partitioning the region up and down is enhanced, and the upstream plane portion 71 rectifies the airflow from the plane portion 71 to the front edge portion 70a of the middle partition member 70 when the blade members 21 and 22 are in the closing direction. The downstream plane portion 72 can rectify the airflow downstream of the partition member 70.

  Next, the function of the ridges 23 and 24 provided on the blade members 21 and 22 will be described with reference to FIG. The ridges 23 and 24 are each formed of a triangular columnar member extending in the width direction with the apexes of the triangle positioned respectively toward the rotation shafts 11 and 12. When the front edge portions 21a and 22a of the blade members 21 and 22 are brought closer to each other than the state shown in FIG. 7, the front edge portions 21a and 22a of the middle partition member 70 and the blade members 21 and 22 and the middle partition member 70 The airflow flowing at high speed in this flow path becomes very unstable, and depending on the turbulence, the airflow does not flow along the inner partition member 70, and the rear side of the blade members 21, 22 (inner peripheral surface 21 d, 22d side), and may flow greatly biased.

  However, in the flow rate adjusting damper 100, as described above, the ridges 23 and 24 are provided along the longitudinal direction of the blade members 21 and 22 on the downstream side of the front edge portions 21a and 22a of the blade members 21 and 22, respectively. Since the protrusions 23 and 24 are provided, the protrusions 23 and 24 become separation start portions where the air flow starts to separate from the front edge portions 21a and 22a of the blade members 21 and 22, and the back side of the blade member 21 (the inner peripheral surfaces 21d and 22d side) ) Can be prevented from being biased. Moreover, since the airflow peeled off from the blade members 21 and 22 can be guided to the surface of the intermediate partition member 70 by the protrusions 23 and 24, it is effective for stabilizing the pressure measurement on the downstream side.

  Based on FIG. 9, the effect of the protrusions 23 and 24 provided on the blade members 21 and 22 will be described. FIG. 9 shows the angle “blade angle (unit: deg)” of the blade members 21 and 22 when the flow velocity of the airflow passing through the flow rate adjustment damper 100 is 1 m / s, the pressure detection unit 40 on the damper upstream side, and the damper downstream side. 6 is a graph showing the relationship between the pressure difference detected by the pressure detectors 50 and 60 on the side “damper differential pressure before and after (unit Pa)”. In the following description, the use limit pressure of the flow rate adjustment damper 100 is 1000 Pa.

  Usually, the relationship between the blade angle and the differential pressure before and after the damper is expressed by a curve having such a characteristic that the differential pressure before and after the damper gradually increases near the blade closing as the blade angle is narrowed down. In order to perform stable control of the flow adjustment damper, as the blade angle decreases, the damper differential pressure does not start to decrease, but tends to increase monotonically with a certain degree of inclination. It is necessary that there is no difference in this characteristic curve between the opening direction operation and the closing direction operation.

  In the case where the ridges 23 and 24 are not provided on the blade members 21 and 22 of the flow rate adjustment damper 100 of the present embodiment, the blade members 21 and 22 under the condition that the flow velocity of the airflow passing through the flow rate adjustment damper 100 is 1 m / s. When the blade 22 is turned in the closing direction, the damper front-rear differential pressure tends to gradually increase as the blade angle decreases until the blade angle is close to 8 degrees. However, when the blade angle is further decreased, the damper front-rear differential pressure is increased. Decreased. If the blade angle is further reduced, the damper front-rear differential pressure gradually increases. When the blade angle reaches around 6 degrees, the damper front-rear differential pressure does not increase again and remains unchanged, and then the damper front-rear differential pressure tends to increase again. In addition, when the blade members 21 and 22 are rotated in the opening direction from the closed state, the damper front-rear differential pressure does not increase near the blade angle of 5 degrees or 9 degrees, and a portion that starts to decrease occurs. There was a phenomenon that the differential pressure across the damper increased monotonously in a small area.

  This is because, when the gap between the front edge portions 21a and 22a of the blade members 21 and 22 and the partition member 70 is narrow (near blade angle 5 to 9 degrees), the airflow flowing through the gap is the partition member 70. This is because an unstable flow that is biased to one of the blade members 21 and 22 does not flow. When the airflow downstream of the blade members 21 and 22 becomes unstable, the pressure detected by the pressure detection units 50 and 60 also becomes unstable, which causes a problem in controlling the flow rate adjustment damper 100.

  When the protrusions 23 and 24 are provided on the front edge portions 21a and 22a of the blade members 21 and 22, respectively, the airflow flowing through the gap between the front edge portions 21a and 22a of the blade members 21 and 22 and the partition member 70 is Regardless of whether the blade members 21 and 22 are rotated in the opening direction or the closing direction, they are guided by the ridges 23 and 24 so as to flow along the partition member 70, and are stable along the partition member 70. It becomes the flow.

  Therefore, between the blade angle and the differential pressure across the damper, there is a relationship in which the damper differential pressure increases monotonously as the blade angle decreases in the region where the blade angle is small, and There is no difference in the characteristic curve of the operation in the closing direction, and the curves are almost the same, and even when the blade angle is small, the flow control damper 100 is not easily affected by the turbulence of the air flow in the flow control damper 100, and the flow control damper 100 is stably controlled. Is possible.

  Although the flow velocity of the airflow passing through the flow rate adjustment damper 100 is 1 m / s as described above, such a phenomenon occurs in the same blade angle range even when the flow velocity is increased. It is possible. Also in this case, due to the action of the protrusions 23 and 24, the blade member tends to increase monotonously with a certain degree of inclination in the region where the blade angle is small between the blade angle and the differential pressure across the damper. By the opening direction operation and the closing direction operation of 21, 22, it is possible to ensure a relationship without difference in the shape of this characteristic curve.

  In the flow rate adjustment damper 100 of the present embodiment, since the cross-sectional shape of the ridges 23 and 24 is a triangle, for example, compared to the case where the shape of the ridges 23 and 24 is a smooth curved surface such as an arc, It is excellent in the peeling action of the air current from the blade members 21 and 22 and the guiding action to the partition member. The protrusions 23 and 24 are continuously provided in the longitudinal direction of the blade members 21 and 22 (the direction crossing the damper casing 10), but may be provided in a discontinuous state.

  The flow rate adjustment damper 100 described with reference to FIGS. 1 to 9 shows an example of the present invention, and the flow rate adjustment damper of the present invention is not limited to the flow rate adjustment damper 100 described above.

  The flow control damper of the present invention can be widely used in the field of construction industry as an air conditioning material for constructing a building air supply and exhaust system.

10 Damper casing 11, 12 Rotating shaft 21, 22 Blade member 21a, 22a Front edge portion 21b, 22b Rear edge portion 21c, 22c Outer peripheral surface 21d, 22d Inner peripheral surface 23, 24 Projection portion 25, 26 Fan plate member 27, 28, 29, 30 Packing 31, 32, 33, 34 Frame member 40, 50, 60 Pressure detection part 70 Middle partition member 71, 72 Flat part 80 Control box 100 Flow rate adjustment damper

Claims (7)

  A rectangular cylinder-shaped damper casing, a plurality of rotating shafts provided in a direction crossing the damper casing, and an opposing posture in which at least the front edge portions with respect to the airflow direction can approach and separate from each other by rotation of the rotating shaft A plurality of blade members arranged so as to form the blade member, and on the upstream side and the downstream side with respect to the airflow direction of the blade member so as to form a fully opened holding position of the blade member on the inner peripheral surface of the damper casing Frame members disposed respectively, and pressure detection units respectively disposed on the upstream side and the downstream side of the inner circumferential surface of the damper casing with respect to the air flow direction of the blade member, and the blades in the damper casing A flow rate adjusting damper having a partition member that crosses the damper casing in a region where the front edge of the member approaches and separates.   The flow rate adjustment damper according to claim 1, wherein a pressure detection unit on the downstream side with respect to the flow direction of the airflow of the blade member is disposed in an area covered with the frame member disposed on the downstream side of the flow direction of the airflow of the blade member. .   The partition member has a wing shape with a flat portion extending forward and backward with respect to the airflow direction, and its thickness continuously increases from the front edge to the rear edge with respect to the airflow direction. 3, wherein the maximum thickness portion decreases continuously through the maximum thickness portion, and the maximum thickness portion is provided closer to the front edge than the center line in the front-rear direction of the inner partition member. Flow adjustment damper.   The flow rate according to any one of claims 1 to 3, further comprising flat portions extending respectively forward and rearward of the middle partition member along a front edge portion and a rear edge portion with respect to a flow direction of the air flow of the middle partition member. Adjustment damper.   The flow rate adjustment damper according to any one of claims 1 to 4, wherein a ridge portion is provided along the longitudinal direction on the downstream side of the front edge portion of the blade member with respect to the airflow direction.   The flow rate adjustment damper according to claim 5, wherein the protrusion has a triangular cross-sectional shape.   The flow rate adjustment damper according to claim 1, further comprising a cover that covers a downstream side of the air flow direction of the pressure detection unit on the upstream side of the blade member with respect to a flow direction of the air flow.

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