JP6229873B2 - Flow control damper - Google Patents

Description

  The present invention relates to a flow rate control damper that improves flow rate controllability and reduces pressure loss when the damper is fully opened.

  A damper for adjusting the air volume is disposed in the duct of the air conditioning equipment. As the damper, there are known a parallel blade damper used for switching between fully open and fully closed, and an opposed blade damper used for proportional control of fluid.

  An example of the parallel blade damper is shown in FIG. The parallel blade damper 110 mainly includes a casing 2 connected to a duct (not shown), movable blades 130 and 160, guide plates 140 and 170, and a driving device (not shown). The movable blades 130 and 160 are rotatably disposed in the casing 2 via fixed shafts 191 and 192 of the driving device, and the movable blade 130 and the movable blade 160 are rotated in the same direction. . Thus, the opening degree of the damper can be freely changed by rotating the movable blades 130 and 160.

  As the counter blade damper, for example, as shown in FIG. 9, there is a linear characteristic between the opening degree and the flow rate. The opposed blade damper 10 mainly includes a casing 2 connected to a duct (not shown), movable blades 3 and 6, guide plates 4 and 7, and a driving device (not shown). The movable blades 3 and 6 are rotatably disposed in the casing 2 via fixed shafts 91 and 92 of the driving device, and the movable blade 3 and the movable blade 6 are rotated in opposite directions. . As the movable blades 3 and 6 rotate in this manner, the opening degree of the damper can be freely changed.

  In addition, a separator serving as a partitioning partition plate for the branch duct is provided at the branch port on the duct body side, and the parallel blade damper is disposed on the same rotation shaft with the mounting angle being changed across the separator. A technique related to a blower amount distribution device is known (see, for example, Patent Document 1). In addition, in the opposite wing damper, the change characteristic of the fluid flow rate with respect to the valve opening angle in the fully open region from the opening to the opening end of the valve plate is made substantially linear, facilitating the control of the flow rate adjustment by the damper, A technique related to a counter blade damper that facilitates control for fine adjustment is known (see, for example, Patent Document 2). In this technique, a resistor projecting from the distal end side of a flat valve plate is disposed.

Japanese Patent Publication No. 05-006097 Japanese Patent Laid-Open No. 08-254354

  However, in both of the techniques described in Patent Documents 1 and 2, when the damper is in an open state (particularly at a minute opening), the air current is separated from the movable blades on the downstream side of the movable blades to generate vortices. There is a problem that the pressure loss before and after the damper becomes large, and pressure pulsation and noise are generated due to the growth and damping of the generated vortex.

  Accordingly, an object of the present invention is to solve the above-described problems, to provide a flow control damper that improves flow controllability and reduces pressure loss.

In order to solve the above-mentioned problems, the invention according to claim 1 is a casing that is connected to a duct to form a fluid flow path, and is rotatably disposed in the casing, and is rotated to rotate the flow path. A movable blade having a curved surface portion convexly curved toward the inflow direction of the fluid, a guide member for guiding the fluid to the movable blade, and a curved surface of the movable blade. The movable blade is disposed at the end on the side through which the fluid passes when the movable blade is in an open state so as to be smaller than the entire length of the movable blade, and has a curved surface portion that is convexly curved toward the fluid conveyance direction. induced wide wants as the downstream side of the movable blade, comprising: a suppressing derivative generation of vortices, the said movable vanes are rotatably provided at a position separated from the curved surface portion, said movable blade The rotation angle of the cylinder and the opening of the casing are linear Having a flow rate control damper, characterized in that.

  According to this invention, the fluid is diffused to the downstream side of the movable blade by the derivative disposed at the end portion on the side through which the fluid passes when the movable blade on the curved surface of the movable blade is in the open state. The generation of vortices is suppressed.

The invention according to claim 2 is a casing that is connected to a duct to form a fluid flow path, and a movable blade that is rotatably disposed in the casing and is capable of varying the opening degree of the flow path by rotating. And a movable blade having a curved surface portion convexly curved toward the fluid inflow direction, a guide member for guiding the fluid to the movable blade, and a fluid when the movable blade of the curved surface of the movable blade is in an open state. There is arranged is formed smaller than the full length of the movable blade to the end on the side to pass through, said has a curved surface portion which is curved convexly toward the side opposite to the curved surface of the movable blade, the fluid in the movable blades induced to wide want downstream, comprises a suppressing derivative generation of vortices, the said movable vanes are rotatably provided at a position separated from the curved surface portion, and the rotation angle of the movable vanes and opening of the casing has a linear characteristic, it A flow rate control damper and said.

  According to a third aspect of the present invention, in the flow control damper according to the first aspect, the curved surface of the movable vane forms a part of the outer peripheral surface of a cylinder or a column, and the curved surface of the derivative is larger than the cylinder or the column. A part of the outer peripheral surface of a small diameter cylinder or column is formed.

  According to the first and second aspects of the invention, a part of the fluid flows along the curved surface of the movable blade and the derivative disposed at the end of the curved surface of the movable blade. It diffuses and flows on the side. That is, especially when the opening of the damper is small, the flow path is narrowed by the Coanda effect due to the arrangement of the derivative, so that the suction is drawn to the outer peripheral surface of the derivative and the inner peripheral surface of the movable blade. And flow to adhere. Thereby, fluid can diffuse and generation of vortices on the downstream side of the movable blade can be suppressed. Further, when the damper opening is made minute, the turbulence of the air flow on the downstream side of the movable blade can be suppressed, and the pressure pulsation and noise can be reduced.

  Further, the inflowing fluid can be smoothly guided to the movable blade by the guide member while suppressing the disturbance of the airflow.

  According to the third aspect of the invention, the curved surface of the derivative forms a part of the outer peripheral surface of the cylinder having a smaller diameter than the cylinder, so that the flow path is not blocked even when the damper is fully opened. Fluid transport is not hindered and pressure loss does not increase. That is, when the derivative is made large, the derivative protrudes into the flow path with respect to the inflow direction when the damper is fully opened, and the conveyance of the fluid is hindered to increase the pressure loss. On the other hand, if the derivative is made small, a sufficient effect cannot be obtained due to the Coanda effect.

It is a front view which shows the opposing blade | wing damper which concerns on Embodiment 1 of this invention. FIG. 2 is a side view showing a fluid diffusion state when the opening degree is fully opened in the opposed blade damper of FIG. 1. FIG. 2 is a front view when the opening degree is minute in the opposed blade damper of FIG. 1. It is a side view which shows the diffusion state of the fluid when the opening degree is made minute in the opposed blade damper of FIG. It is a figure which shows the pressure loss reduction rate according to damper opening degree for every wind speed of the opposing blade | wing damper of FIG. It is a figure which shows the noise reduction rate according to the frequency band for every wind speed in the opening degree of 30 degrees of the opposing blade | wing damper of FIG. It is a side view which shows the parallel blade | wing damper which concerns on Embodiment 2 of this invention, and is the schematic which shows the spreading | diffusion state of the fluid at the time of opening degree being minute. It is a side view which shows the conventional parallel blade damper, and is the schematic which shows the spreading | diffusion state of the fluid at the time of opening degree being minute. It is a side view which shows the conventional opposing blade | wing damper, and is the schematic which shows the spreading | diffusion state of the fluid at the time of opening degree being minute.

(Embodiment 1)
1 to 6 show an embodiment of the present invention. The opposed blade damper 1 is connected to a duct (not shown) of the air conditioning equipment and proportionally controls the flow rate of the fluid. As shown in FIGS. 1 and 2, the casing 2, the movable blade 3, 6, guide plates 4 and 7 as guide members, and derivatives 5 and 8. The guide plates 4 and 7 are hollow, but are not limited to the plate body and may be constituted by a block body.

  As shown in FIG. 1 and FIG. 2, the casing 2 is a rectangular tubular body that is connected to a duct to form a fluid flow path, and flanges for connecting to the duct at opening edges at both ends in the axial direction. Portions 2a and 2b are formed. The fluid flowing in from the opening on the flange portion 2a side passes through the casing 2 and flows out from the opening on the flange portion 2b side. Here, the width direction of the opening of the casing 2 is X, the height direction is Y, and the depth direction that is the fluid passage direction (the direction from the flange portion 2a toward the flange portion 2b) in the casing 2 is Z. In this embodiment, for example, the casing 2 is set to have a width of 405 mm, a height of 405 mm, and a depth of 500 mm.

  The movable blade 3 is rotatably disposed in the casing 2 and has a curved surface portion 31 curved in the fluid inflow direction, a flat surface portion 34 on the back side, and side surface portions 32 and 33. The curved surface portion 31 has a shape obtained by cutting out a part of a cylinder or a column, and is disposed such that the axial direction extends along the width direction X of the casing 2. The side parts 32 and 33 are formed in a substantially fan-shaped flat plate shape, and the arc-shaped outer edge part and the X direction both ends of the curved surface part 31 are joined. On the back side of the curved surface portion 31, a flat surface portion 34 is disposed so as to extend in the X direction on the chord portion of the curved surface portion 31. The side opposite to the curved surface portion 31 of the flat surface portion 34 has a hollow shape, so that fluid can pass between the side surface portions 32 and 33. The side surfaces 32 and 33 are formed with insertion holes (not shown) for inserting a fixed shaft 91 of the driving device 9 described later, and the movable blade 3 is rotated by the angle of the fixed shaft 91 to open the opening. (In this embodiment, the size of a gap with a movable blade 6 described later) is adjustable. As the movable blade 3 rotates, the curved surface portion 31 opens and closes with respect to the opening of the casing 2, and the opening degree of the casing 2 can be adjusted. Specifically, as shown in FIGS. 1 and 2, when the curved surface portion 31 faces upward and the opening S <b> 1 is wide open, the opening of the casing 2 is fully open, as shown in FIGS. 3 and 4. Thus, when the curved surface portion 31 is rotated and tilted so as to close the opening S2, the opening degree of the casing 2 is very small. Further, when the end portion 31a of the curved surface portion 31 and the end portion 61a of the curved surface 61 of the movable blade 6 are in contact with each other, and the opening portions S2 are completely closed by the curved portions 31, 61, the casing 2 Is fully closed. In this embodiment, for example, the length of the curved surface portion 31 is set to 160 mm. Further, the fixed shaft 91 is set to be the center of curvature of the curved surface portion 31.

  The guide plate 4 guides the fluid flowing in along the inner peripheral wall upper surface portion 21 from the opening on the flange portion 2a side of the casing 2 to the movable blade 3, and as shown in FIG. The part 21 is disposed so as to extend along the width direction X. The shape and position of the guide plate 4 are set so as to contact the curved surface portion 31 when the movable blade 3 rotates, and the guide plate 4 is provided so as to close the gap between the movable blade 3 and the inner peripheral wall upper surface portion 21. As shown in FIG. 2, it has a curved surface portion 41 that is gently curved from the inner peripheral wall upper surface portion 21 of the casing 2 toward the contact portion with the movable blade 3. More specifically, the end portion 41a on the downstream side of the curved surface portion 41 and the curved surface portion 31 are in contact with each other, and the end portion 41a is made of an elastic material such as rubber in order to improve the blocking property between the curved surface portion 31. It may be formed of a body, or an elastic member may be attached to the end 41a. Further, in order to reduce the resistance when the movable blade 3 rotates, the surface of the elastic body may be coated with a material having good slidability such as a fluororesin. The fluid conveyed along the inner peripheral wall upper surface portion 21 of the casing 2 by the guide plate 4 proceeds in the depth direction Z along the curved surface portion 41 of the guide plate 4, and further in the depth direction Z along the movable blade 3. It has come to go.

  As shown in FIGS. 1 and 2, the derivative 5 is disposed on the upstream end portion 31 a when the curved surface portion 31 of the movable blade 3 is in the open state, and is curved in a convex manner in a direction facing the curved surface portion 31. 51 is formed. The derivative 5 has a shape obtained by cutting out a part of a cylinder, and is arranged such that its axial direction extends along the end portion 31 a of the movable blade 3, that is, along the width direction X. The derivative 5 is smaller than the entire length of the movable blade 3. For example, the curved surface portion 51 is set to have a diameter of about 10 to 30% of the curved surface portion 31. Such a derivative 5 is configured such that the fluid diffuses to the downstream side of the movable blade 3 due to the Coanda effect, and suppresses the generation of vortices on the downstream side of the fluid. In this embodiment, for example, the radius of the curved surface portion 51 is set to 32 mm.

  The movable blade 6, the guide plate 7, and the derivative 8 are configured similarly to the movable blade 3, the guide plate 4, and the derivative 5. As shown in FIG. 2, the movable blade 6 is disposed on the lower side of the casing 2 so as to face the movable blade 3, and rotates so as to face the movable blade 3. Specifically, as shown in FIGS. 1 and 2, when the curved surface portion 31 of the movable blade 3 faces upward, the curved surface portion 61 faces downward. Further, as shown in FIGS. 3 and 4, when the curved surface portion 31 is rotated and tilted so as to close the opening S2, the curved surface portion 61 tilts so as to close the opening S2. ing.

  The guide plate 7 guides the fluid flowing along the inner peripheral wall lower surface portion 22 from the opening on the flange portion 2 a side of the casing 2 to the movable blade 6, and is disposed on the inner peripheral wall lower surface portion 22 of the casing 2. Yes.

  The derivative 8 is disposed at the upstream end 61 a when the curved surface portion 61 of the movable blade 6 is in the open state, and a curved surface portion 81 that is curved in a direction facing the curved surface portion 61 is formed.

  In the present embodiment, the fluid passes only from the gap between the end 31a of the movable blade 3 and the end 61a of the movable blade 6, and the other end (that is, the inner peripheral wall upper surface 21 side of the curved surface portion 31a (guide) Plate 4 side) and the inner peripheral wall lower surface portion 22 side (guide plate 7 side) of the curved surface portion 61a) are closed by the guide plates 4 and 7 as described above so that fluid does not pass through the end portion 31a, The end portion 61a corresponds to the “end portion on the side through which the fluid passes in the open state” in the invention. Then, the flow rate of the fluid passing through the casing 2 is adjusted by rotating the movable blades 3 and 6 and adjusting the size (that is, the opening degree) of the gap between the end portion 31a and the end portion 61a. The derivatives 5 and 8 suppress the generation of vortices on the downstream side of the movable blades 3 and 6 when the fluid passes through the gap.

  As shown in FIG. 1, the drive device 9 is a motor disposed on the right side surface portion of the casing 2, and mainly includes fixed shafts 91 and 92 and an opening adjustment knob 93. The fixed shaft 91 is inserted through the center in the depth direction Z of both side surfaces of the casing 2 and above the height direction Y, and the fixed shaft 92 is positioned at the height of the casing 2 so as to face the fixed shaft 91. It is inserted below the direction Y. The fixed shafts 91 and 92 are rotatable by the motor of the driving device 9 so that the effective opening of the casing 2 with respect to the angle of the fixed shafts 91 and 92 has a linear characteristic. The opening adjustment knob 93 is for adjusting the opening of the casing 2. Specifically, when the opening adjustment knob 93 is set to a predetermined opening, the fixed shafts 91 and 92 rotate by a predetermined angle. Then, the movable blades 3 and 6 face each other and rotate. Thereby, the opening degree of the casing 2 can be adjusted. In this embodiment, for example, the arrangement positions of the fixed shafts 91 and 92 are set to 113 mm from the inner peripheral wall upper surface portion 21 and the inner peripheral wall lower surface portion 22 of the casing 2.

  Next, the usage method and operation of the opposed blade damper 1 having such a configuration will be described.

  First, the case where the opening degree of the casing 2 is fully opened as shown in FIGS. 1 and 2 will be described.

  First, the opening adjustment knob 93 is set to “opening of the casing 2 fully open”, and the fixed shafts 91 and 92 are rotated by a predetermined angle by the motor, whereby the movable blade 3 is movable with the curved surface portion 31 facing upward. The blade 6 is in a state in which the curved surface portion 61 faces downward. Thereby, in the casing 2, between the movable blade 3 and the movable blade 6 opens large, and opening S1 is formed.

  At this time, in the casing 2, the fluid transported along the inner peripheral wall upper surface portion 21 is transported in the depth direction Z along the curved surface portion 41 of the guide plate 4 and guided along the curved surface portion 31 a of the movable blade 3. The fluid that has reached the end portion 31 a is further diffused along the curved surface portion 51 of the derivative 5 to the inner peripheral surface side of the curved surface portion 31. Further, the fluid transported along the inner peripheral wall lower surface portion 22 is transported in the depth direction Z along the curved surface portion 71 of the guide plate 7, and the fluid reaching the end portion 61 a of the movable blade 6 further flows into the derivative 8. Is diffused along the curved surface portion 81 toward the inner peripheral surface side of the curved surface portion 61.

  Next, as shown in FIGS. 3 and 4, the case where the opening degree of the casing 2 is made small will be described.

  First, the opening adjustment knob 93 is set to “small opening of the casing 2”, and the fixed shafts 91 and 92 are rotated by a predetermined angle by the motor. The movable blade 6 is tilted so that the curved surface portion 61 rotates and closes the opening. Thereby, an opening S <b> 2 is formed in the casing 2 between the movable blade 3 and the movable blade 6.

  At this time, in the casing 2, the fluid transported along the inner peripheral wall upper surface portion 21 is transported in the depth direction Z along the curved surface portion 41 of the guide plate 4 and further transported downward along the movable blade 3. Is done. Then, the fluid that has reached the end 31 a of the movable blade 3 is diffused along the curved surface portion 51 of the derivative 5 to the inner peripheral surface side of the curved surface portion 31. Further, the fluid conveyed along the inner peripheral wall lower surface portion 22 is conveyed in the depth direction Z along the curved surface portion 71 of the guide plate 7, and further conveyed downward along the movable blade 6. Then, the fluid that has reached the end portion 61 a of the movable blade 6 is diffused along the curved surface portion 81 of the derivative 8 toward the inner peripheral surface side of the curved surface portion 61.

  Here, as a comparative example, a conventional opposed blade damper 10 shown in FIG. 9 will be described. The opposed blade damper 10 differs from the opposed blade damper 1 only in that the derivatives 5 and 8 are not provided. For this reason, about the structure equivalent to the opposing blade | wing damper 1, the description is abbreviate | omitted by attaching | subjecting the same code | symbol or a corresponding code | symbol.

  When the opening degree of the casing 2 is very small, the fluid conveyed along the inner peripheral wall upper surface portion 21 in the casing 2 proceeds in the depth direction Z along the curved surface portion 41 of the guide plate 4, and further, the movable blade 3 is conveyed downward along the line 3. Then, the fluid that has reached the end portion 31 a of the movable blade 3 is not diffused to the inner peripheral surface side of the curved surface portion 31 and is conveyed in the depth direction Z. That is, the fluid that has reached the end 31a of the movable blade 3 cannot be obtained with the Coanda effect due to the absence of the derivative 5, and is conveyed in the depth direction Z while being concentrated in the vicinity of the central portion of the opening S2. In addition, Patent Document 2 describes a configuration in which a resistor having an arc-shaped cross-section protruding from the tip of the flat valve plate is provided. However, since the valve plate has a flat plate shape, A smooth flow along the resistor is not formed, and the generation of vortices on the downstream side of the valve body cannot be sufficiently suppressed.

  As described above, according to the embodiment of the present invention, a part of the fluid flows along the derivatives 5 and 8, so that the downstream side of the movable blades 3 and 6, that is, the inner peripheral surface side of the curved surface portion 31. Then, it is diffused and conveyed on the inner peripheral surface side of the curved surface portion 61. That is, since the flow path is narrowed by the Coanda effect due to the provision of the derivatives 5 and 8, particularly when the opening of the damper is very small, the curved surface portion 51 of the derivative 5 and the curvature of the derivative 8 are curved. The surface 81, the inner peripheral surface of the curved surface portion 31 of the movable blade 3 and the inner peripheral surface of the curved surface portion 61 of the movable blade 6 are attracted and conveyed. As a result, the fluid diffuses on the inner peripheral surface side of the curved surface portion 31 of the movable blade 3 and the inner peripheral surface side of the curved surface portion 61 of the movable blade 6, so that the generation of vortices on the downstream side of the movable blade 3 and 6 is suppressed. be able to. Thereby, since the pressure pulsation is reduced, the pressure measurement accuracy on the downstream side of the movable blades 3 and 6 is improved.

  In addition, since the guide plates 4 and 7 are formed in a gently curved shape, the fluid that has flowed in can be smoothly guided to the movable blade 3 by controlling the turbulence of the airflow.

  Furthermore, since the derivatives 5 and 8 are smaller than the movable blades 3 and 6 and are formed at the upstream end portions 31a and 61a when the movable blades 3 and 6 are in the open state, the derivative 5 , 8 does not protrude into the flow path. For this reason, since the derivative | guide_bodies 5 and 8 do not obstruct | occlude a flow path, since conveyance of a fluid is not prevented, a pressure loss does not increase. For example, when the derivatives 5 and 8 are made larger, the derivatives 5 and 8 protrude greatly into the flow path when the damper is fully opened, and the fluid conveyance is hindered, resulting in an increase in pressure loss. Moreover, when the derivatives 5 and 8 are made small, a sufficient effect cannot be obtained due to the Coanda effect. For this reason, the derivative | guide_bodies 5 and 8 are smaller than the full length of the movable blades 3 and 6, and when a diameter of about 10 to 30% is set, a suitable effect is acquired.

  FIG. 5 illustrates the relationship between the damper opening and the pressure loss reduction effect when the wind speed is changed from 1 m / s to 10 m / s by 1 m / s. From this result, it can be seen that when the damper opening is small, a large pressure loss reduction effect can be obtained. Thereby, even when the damper opening is small, the pressure loss is reduced, so that the flow rate controllability is improved. Further, it can be seen that when the damper opening is large, a large pressure loss reduction effect can be obtained when the high wind speed is 10 m / s, that is, the blower power can be reduced.

  FIG. 6 illustrates the relationship between the frequency band and the noise reduction effect when the damper opening is set to 30 ° and the wind speed is changed. From this result, it can be seen that a noise reduction effect of about 2 to 10% is obtained in each frequency band at any wind speed.

(Embodiment 2)
FIG. 7 is a view showing the parallel blade damper 100 according to this embodiment. In this embodiment, the movable blades 130 and 160 and the guide plates 140 and 170 are different from the movable blades 3 and 6 and the guide plates 4 and 7 of the first embodiment. For this reason, about the structure equivalent to Embodiment 1, the description is abbreviate | omitted by attaching | subjecting the code | symbol same or corresponding.

  The parallel blade damper 110 includes a casing 2 connected to a duct (not shown), movable blades 130 and 160, guide plates 140 and 170, and a driving device (not shown). The movable blades 130 and 160 are rotatably disposed in the casing 2 via fixed shafts 191 and 192 of the driving device, and the movable blade 130 and the movable blade 160 are rotated in the same direction. . By rotating the movable blades 130 and 160 in this way, the opening of the damper, that is, in this embodiment, the size of the gap between the movable blade 130 and the guide plate 170, The magnitude | size of the clearance gap between the surrounding wall lower surface parts 22 is changeable, and the flow volume which a fluid passes through the casing 2 is adjusted by adjusting this.

  The derivative 150 is disposed at the upstream end 131a when the curved surface portion 131 of the movable blade 130 is open, and the derivative 180 is disposed at the upstream end 161a when the curved surface portion 161 of the movable blade 160 is open. Has been.

  In the present embodiment, the fluid passes only from the gap between the end portion 131a of the movable blade 130 and the guide plate 170 and the gap between the end portion 161a of the movable blade 160 and the lower surface portion 22 of the inner peripheral wall. From the other end side of 130 and 160 (that is, the inner peripheral wall 21 side (guide plate 140 side) of the curved surface portion 131 and the guide plate 170 side of the curved surface portion 161), the fluid is blocked by the guide plates 140 and 170 as described above. The end portion 131a and the end portion 161a correspond to the “end portion on the side through which the fluid passes when in the open state” in the invention. Then, the flow rate of the fluid passing through the casing 2 is adjusted by rotating the movable blades 130 and 160 to adjust the size (that is, the opening degree) of the gap between the end 131a and the end 161a. The derivatives 150 and 180 suppress the generation of vortices on the downstream side of the movable vanes 130 and 160 when the fluid passes through the gap.

  When the opening adjustment knob 93 is set to “opening of the casing 2 fully open”, the fixed shafts 91 and 92 are rotated by a predetermined angle by the motor, so that the movable blades 130 and 160 have the curved surface portion 31 upward. It is considered to be in a state facing. When the opening adjustment knob 93 is set to “small opening of the casing 2”, the fixed shafts 91 and 92 are rotated by a predetermined angle by the motor, so that the movable blades 130 and 160 are curved surface portions 131 and 161. Is tilted so as to rotate and close the opening.

  By disposing such derivatives 150 and 180, the fluid diffuses to the downstream side of the movable blades 130 and 160 by the Coanda effect, and suppresses the generation of vortices on the downstream side of the fluid. Can do. Further, when the damper opening is made minute, the turbulence of the air flow on the downstream side of the movable blades 130 and 160 can be suppressed, and pressure pulsation and noise can be reduced. Specifically, in the casing 2, the fluid conveyed along the inner peripheral wall upper surface portion 21 is conveyed in the depth direction Z along the curved surface portion of the guide plate 140, and further downward along the movable blade 130. Be transported. Then, the fluid that has reached the lower end portion of the movable blade 130 is diffused along the curved surface portion 151 of the derivative 150 to the inner peripheral surface side of the curved surface portion 131. Further, the fluid transported around the central portion of the casing 2 is transported in the depth direction Z along the curved surface portion of the guide plate 170, and further transported downward along the movable blade 160. Then, the fluid that has reached the lower end portion of the movable blade 160 is diffused along the curved surface portion 181 of the derivative 180 to the inner peripheral surface side of the curved surface portion 161.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the case of the opposed blade damper 1 and the parallel blade damper 100, the case where the movable blade is configured in two upper and lower stages has been described, but it is needless to say that the movable blade may be configured in three upper and lower stages.

DESCRIPTION OF SYMBOLS 1 Counter blade damper 2 Casing 3, 6 Movable blade 31, 61 Curved surface part 4, 7 Guide plate (guide member)
5, 8 Derivative 9 Drive unit 91, 92 Fixed shaft

Claims (3)

A casing connected to the duct to form a fluid flow path;
A movable vane that is pivotally disposed in the casing and is configured to vary the opening degree of the flow path by rotating, and having a curved surface portion that is convexly curved toward the fluid inflow direction;
A guide member for guiding fluid to the movable blade;
The curved surface of the movable blade is formed to be smaller than the entire length of the movable blade at the end portion on the side where the fluid passes when the movable blade is in an open state, and is curved so as to be convex toward the fluid conveyance direction. has a face to induce fluid as wide want downstream of the movable blade, comprising: a suppressing derivative generation of vortices, and
The movable blade is rotatably provided at a position separated from the curved surface portion, and the rotation angle of the movable blade and the opening of the casing have linear characteristics.
A flow control damper characterized by that. A casing connected to the duct to form a fluid flow path;
A movable vane that is pivotally disposed in the casing and is configured to vary the opening degree of the flow path by rotating, and having a curved surface portion that is convexly curved toward the fluid inflow direction;
A guide member for guiding fluid to the movable blade;
The curved surface of the movable blade is disposed at the end on the side through which the fluid passes when the movable blade is in an open state so as to be smaller than the entire length of the movable blade, and on the opposite side of the curved surface of the movable blade. It has a curved surface portion which is curved convexly, to induce fluid as wide want downstream of the movable blade, comprising: a suppressing derivative generation of vortices, and
The movable blade is rotatably provided at a position separated from the curved surface portion, and the rotation angle of the movable blade and the opening of the casing have linear characteristics.
A flow control damper characterized by that. The curved surface of the movable blade forms a part of the outer peripheral surface of a cylinder or a column,
The curved surface of the derivative forms a part of the outer peripheral surface of a cylinder or column having a smaller diameter than the cylinder or column,
The flow control damper according to claim 1.

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