JP2007333221A - Shutter mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shutter mechanism that is usable in preventing back flow of a fluid flowing in a pipeline mainly by ventilating fans, pumps, or the like, suppresses the noise and vibration caused by resistance to fluid and by turbulence, has proper blocking performance, is manufactured at low cost and applicable to a fluid machine such as a blower. <P>SOLUTION: The shutter mechanism comprises a shutter plate 6 turnable about a turning shaft 9 and dividing the pipeline 2 in the open state into two passages, which are a front passage 19 with a large area and a rear passage 20 with a small area. By setting so that the outer periphery 16 of an upstream area 17 of the shutter plate 6 upstream of the turning shaft 9 in the open state of a shutter will not be located in a fast flow velocity range of an air current, the shutter mechanism with less noise and vibration caused by the resistance to the air current 11 and turbulence, having proper blocking performance, manufactured at low cost and applicable to the fluid machine, such as the blower can be obtained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shutter mechanism used for preventing a backflow of fluid flowing through a pipe line mainly by a ventilation fan or a pump.

  Conventionally, this type of shutter mechanism is known in which a flat shutter plate is attached to the inside of a pipeline so as to be rotatable about a rotation axis (see, for example, Patent Document 1).

  The shutter mechanism will be described below with reference to FIG.

  As shown in FIG. 12, a flat shutter plate 102 is attached to a cylindrical body 101 used as a ventilation opening so as to be rotatable about a rotation shaft 103, and the rotation angle is limited. A locking piece 104 is provided. The rotation shaft 103 is located near the center of the cylinder 101 in order to reduce the torque required for the shutter plate 102 to rotate.

In the above configuration, the shutter plate 102 is rotated to a state in which the cylinder body 101 is opened (hereinafter referred to as a shutter open state) by the wind pressure of the blown air 106 from the upstream 105 of the cylinder body 101. Further, when there is no air blow, the shutter plate 102 is rotated even if it receives a wind pressure of outside air that flows back through the cylinder 101 by rotating to a state in which the cylinder 101 is closed by its own weight (hereinafter referred to as a shutter closed state). Since the rotation is restricted by the locking piece 104, the backflow to the upstream 105 is prevented.
Japanese Patent No. 3266482

  In general, the fluid flowing through the pipeline has a flow velocity distribution such that the flow velocity at the center is the fastest due to the frictional force of the outer wall of the pipeline, and the flow velocity becomes slower as it approaches the outer wall. In this case, since the rotation shaft 103 of the shutter plate 102 is positioned near the center of the cylinder 101, the upstream region 107 of the shutter plate 102 that is upstream from the rotation shaft 103 when the shutter plate 102 is open is the cylinder 101. Therefore, there is a problem in that a fluid having a high flow velocity collides with the shutter plate 102 and the resistance to the fluid increases, thereby decreasing the flow rate of the fluid and increasing the load of the fluid machine that generates the flow. Therefore, it is required to reduce resistance to fluid.

  Further, since the shutter plate 102 is located in a region where the flow velocity is high, there is a problem that a large flow turbulence occurs when the fluid collides with the shutter plate 102, and noise and vibration due to the turbulence occur. There is a demand for less disturbance.

  It can also be applied to blowers and pumps, which are fluid machines that generate a flow in the fluid, does not require a complicated mechanism, can be manufactured at low cost, and requires a shutter mechanism with good blockage to prevent backflow. ing.

  The present invention solves such a conventional problem, suppresses noise and vibration due to fluid resistance and flow disturbance, has good blockage, can be manufactured at low cost, and can be manufactured in a fluid machine such as a blower. An object is to provide an applicable shutter mechanism.

  In order to achieve the above object, the shutter mechanism of the present invention is provided in a pipe line surrounded by an outer wall, is rotatable about a rotation shaft, is closed to close the pipe line, and is opened to be opened. A shutter plate that divides the pipe into two channels, a front channel with a large area and a small channel with a small area when the channel is open, and the fluid flowing through the channel is perpendicular to the axis of the pipeline In the case of having a velocity distribution on a plane, the shutter mechanism is configured such that the outer periphery of the upstream region of the shutter plate that is upstream from the rotation shaft when the shutter is open is not located in a range where the fluid flow velocity is high.

  By this means, when the shutter is in the open state, it is possible to prevent the fluid having a high flow velocity from colliding with the outer periphery of the upstream region of the shutter plate, thereby suppressing the turbulence of the flow, which is caused by the resistance to the fluid or the turbulence. A shutter mechanism that can reduce noise and vibration is obtained.

  The other means is provided in a pipe line surrounded by the outer wall, can be rotated around a rotation axis, and can be positioned in a closed state in which the pipe line is closed and in an open state in which the pipe is opened. In the state of the above, a shutter plate that divides the pipeline into two channels, a front channel with a large area and a small back channel, and when the shutter is open, on a cross section in an arbitrary plane perpendicular to the pipeline axis, The shutter mechanism is such that the cross-sectional area of the surface channel is larger than the area of the larger cross-sectional area of the pipe divided by the rotation axis projection line obtained by projecting the rotation axis perpendicularly to an arbitrary plane. .

  By this means, when the shutter is in the open state, the outer periphery of the upstream region of the shutter plate approaches the outer wall of the pipeline by increasing the area of the flow path including the central portion where the flow velocity is fast, so that the fluid with a high flow velocity is A shutter mechanism can be obtained in which collision with the outer periphery of the upstream region can be avoided and flow disturbance can be suppressed, and resistance to fluid and noise and vibration caused by the disturbance can be reduced.

  Another means is that the downstream area of the shutter plate, which is downstream from the rotation axis when the shutter is open, is on a cross section in an arbitrary plane perpendicular to the pipe axis when the shutter is open, and the outer periphery of the cross section is the pipe line. And a shutter mechanism substantially parallel at a predetermined distance.

  By this means, when the shutter is open, the shutter plate can be positioned near the outer wall of the pipeline with the slowest flow velocity, so that the fluid with a high flow velocity can avoid colliding with the outer periphery of the upstream region of the shutter plate. Thus, it is possible to obtain a shutter mechanism that can suppress flow disturbance and reduce resistance to fluid and noise and vibration caused by the disturbance.

  Another means is a shutter mechanism in which the outer periphery of the downstream region of the shutter plate is constant at a predetermined distance from the pipe line when the shutter is closed.

  By this means, when the shutter is in the closed state, the area of the downstream region of the shutter plate that closes the pipe line can be increased, and a shutter mechanism that can improve the closing property is obtained.

  Another means is a shutter mechanism in which the outer periphery of the upstream region of the shutter plate that is upstream from the rotation shaft when the shutter is open is constant at a predetermined distance from the pipe line when the shutter is closed. .

  By this means, when the shutter is closed, the area of the upstream region of the shutter plate that closes the pipe line can be increased, and a shutter mechanism that can improve the closing property is obtained.

  Another means is a shutter mechanism in which the cross-sectional shape of the upstream region of the shutter plate in an arbitrary plane passing through the pipe axis is a shape smoothly connecting the cross-sectional shape of the downstream region with an arc or a plurality of arcs.

  By this means, when the shutter is open, the fluid can be smoothly guided from the upstream region to the downstream region of the shutter plate, the flow disturbance can be suppressed, the resistance to the fluid, and the noise and vibration caused by the disturbance. A shutter mechanism that can reduce the above is obtained.

  Another means is a shutter mechanism having an anti-separation thickness on the outer periphery of the upstream region of the shutter plate.

  By this means, when the shutter is open, the separation of the fluid colliding with the upstream region of the shutter plate can be suppressed, the fluid can be smoothly guided to the shutter plate, the flow disturbance can be suppressed, A shutter mechanism capable of reducing noise and vibration due to resistance and disturbance can be obtained.

  Another means is a shutter mechanism that is used for a cylindrical pipe line, and when the shutter is closed, the vertical projection shape of the outer periphery of the shutter plate to the projection plane perpendicular to the pipe axis is circular. is there.

  By this means, it is possible to suppress the disturbance of the flow even for a circular pipe generally used as a pipe of a pump or a blower, and to reduce the resistance to the fluid and the noise and vibration caused by the disturbance. Is obtained.

  Another means is a shutter mechanism in which the rotation axis projection line projected on the circular cross section of the pipe is a perpendicular bisector of the center line connecting the center of the pipe and the outer wall.

  By this means, the outer shape of the shutter plate can be minimized, and the shutter mechanism that can reduce the amount of the material of the shutter plate and the thickness of the production die and reduce the product cost can be obtained.

  Another means is a shutter mechanism in which the shutter plate rotates to its closed state by its own weight when there is no fluid flow.

  By this means, a part for rotating the shutter plate can be eliminated, and a shutter mechanism that can reduce the cost can be obtained.

  Another means is a shutter mechanism in which the shutter plate is rotated by a mechanical external force so that the position of the open state or the closed state can be maintained regardless of the fluid pressure state.

  By this means, the shutter plate can be securely held at the optimum position at all times, and when the fluid pressure fluctuates, the shutter plate can be prevented from fluttering and generating noise and vibration. Since the shutter plate can be reliably rotated regardless of the installation direction, it is possible to obtain a shutter mechanism that can reduce resistance to fluid and noise and vibration caused by disturbance.

  Another means is a shutter mechanism in which a portion including a shutter mechanism of a pipe line is horizontally installed and a rotation axis has a predetermined angle with respect to a horizontal plane.

  This means that the torque required to rotate the shutter plate can be reduced, so that when the shutter plate is rotated by the pressure of the fluid, the shutter plate can be rotated at a lower pressure. When the shutter plate is mechanically rotated, a shutter mechanism that can suppress energy required for rotation is obtained.

  The other means regards the pipe line as a set of a plurality of divided pipe lines and uses a shutter mechanism for each of the divided pipe lines.

  By this means, the size of the shutter plate can be reduced, and only the shutter plate in the region where the flow velocity in the pipeline is fast can be rotated, so that the torque necessary to rotate the shutter plate can be obtained. When the shutter plate is rotated by the pressure of the fluid, it can be rotated by a smaller pressure, so that the resistance to the fluid can be reduced and the shutter plate is mechanically rotated. In this case, a shutter mechanism that can suppress energy required for rotation is obtained.

  Another means is a shutter mechanism in which a protruding portion from the pipe line is provided upstream of the shutter plate so that fluid does not flow in the back channel.

  By this means, it is possible to suppress the fluid from colliding with the upstream region of the shutter plate and applying a force in the direction opposite to the rotation to the shutter open state, so that the torque required to rotate the shutter plate is reduced. When the shutter plate is rotated by the pressure of the fluid, since it can be rotated at a smaller pressure, the resistance to the fluid can be reduced, and when the shutter plate is mechanically rotated, A shutter mechanism capable of suppressing energy required for rotation is obtained.

  Another means is a shutter mechanism in which the cross-sectional shape of the protruding portion from the pipe line in a plane passing through the pipe axis is a shape in which the protruding height temporarily increases from upstream to downstream.

  By this means, the fluid can be smoothly guided from the protruding portion to the surface flow path, so that a shutter mechanism that can reduce resistance to the fluid and noise and vibration caused by the disturbance can be obtained.

  Another means is a shutter mechanism in which when the shutter is in a closed state, the entire outer periphery of the shutter plate facing the pipe line is in contact with the inner wall protruding at a predetermined height from the pipe line.

  By this means, there is no gap between the inner peripheral wall and the shutter plate, and a shutter mechanism that can improve the closing property is obtained.

  Another means is a shutter mechanism that is used in a blower blowout or suction pipe using air as a fluid.

  By this means, it is possible to reduce the load on the blower by suppressing the resistance in the shutter mechanism section, so that the rotation required for the blower can be reduced, and the shutter that can reduce the electric power of the blower and the noise generated from the blower. A mechanism is obtained.

  Another means is a shutter mechanism provided inside the adapter that connects the discharge port of the blower and the duct.

  By this means, since the shutter mechanism can be integrated with the blower, it is not necessary to provide a shutter mechanism in the middle of the pipeline, and a shutter mechanism capable of constructing a low-cost blower pipeline is obtained.

  Another means is a shutter mechanism in which the vertical projection of the back channel to the projection plane perpendicular to the pipe axis does not overlap with the vertical projection of the blower outlet.

  By this means, most of the airflow from the outlet of the blower can flow into the surface flow path, and the collision of the airflow to the upstream area of the shutter plate is suppressed, and resistance to the airflow, noise caused by turbulence, A shutter mechanism that can reduce vibration is obtained.

  According to the present invention, it is possible to provide a shutter mechanism that suppresses noise and vibration due to resistance to fluid and flow disturbance, has good blockage, and can be manufactured at low cost.

  The invention according to claim 1 of the present invention is provided in a pipe line surrounded by an outer wall, is rotatable about a rotation shaft, and is positioned in a closed state for closing the pipe line and an open state for opening. It is equipped with a shutter plate that divides the pipe into two channels, a front channel with a large area and a small back channel when the channel is open, and the fluid flowing through the channel is velocity in a plane perpendicular to the channel axis. When the shutter is in the open state, the outer periphery of the upstream area of the shutter plate, which is upstream from the rotation axis when the shutter is open, is a shutter mechanism that prevents the fluid flow rate from being in the fast range. , It is possible to prevent the fluid having a high flow velocity from colliding with the outer periphery of the upstream region of the shutter plate, thereby suppressing the turbulence of the flow, and reducing the resistance to the fluid and the noise and vibration caused by the turbulence. It has the action.

  In addition, it is provided in a pipeline surrounded by the outer wall and can be rotated around a rotation axis, and can be positioned in a closed state where the pipeline is closed and an open state where the pipeline is opened. It has a shutter plate that divides the path into two channels, a surface channel with a large area and a channel with a small back surface, and when the shutter is open, on the cross section in an arbitrary plane perpendicular to the pipe axis, The shutter mechanism is such that the cross-sectional area is larger than the larger area of the cross-sectional area of the pipe divided by the rotation axis projection line obtained by projecting the rotation axis perpendicularly to an arbitrary plane. In the state, since the outer periphery of the upstream region of the shutter plate approaches the outer wall of the pipe line by increasing the area of the flow path including the central portion where the flow velocity is fast, the fluid having a high flow velocity collides with the outer periphery of the upstream region of the shutter plate. Can be avoided and flow disturbance can be suppressed. Resistance and that has the effect that it is possible to reduce the noise and vibration caused by the disturbance.

  In addition, when the shutter is open, the downstream area of the shutter plate, which is downstream of the rotation axis, is on a cross section in an arbitrary plane perpendicular to the pipe axis when the shutter is open, and the outer periphery of the cross section is a predetermined distance from the pipe. Since the shutter plate can be positioned near the outer wall of the pipe with the slowest flow velocity when the shutter is open, fluid with a high flow velocity is located in the upstream region of the shutter plate. The collision with the outer periphery can be avoided, the flow disturbance can be suppressed, and the resistance to the fluid and the noise and vibration caused by the disturbance can be reduced.

  In addition, the shutter mechanism is such that the outer periphery of the downstream area of the shutter plate is constant at a predetermined distance from the pipeline when the shutter is closed, and the downstream area of the shutter plate that closes the pipeline when the shutter is closed. The area can be increased and the blockage can be improved.

  Further, the outer periphery of the upstream region of the shutter plate that is upstream from the rotation shaft when the shutter is open is a shutter mechanism that is constant at a predetermined distance from the pipe line when the shutter is closed. In the state, the area of the upstream region of the shutter plate that closes the pipe line can be increased, and the blockage can be improved.

  The shutter mechanism is a shutter mechanism in which the cross-sectional shape of the upstream region of the shutter plate in an arbitrary plane passing through the pipe axis is a shape that smoothly connects the cross-sectional shape of the downstream region with an arc or a plurality of arcs. Sometimes the fluid can be smoothly guided from the upstream region to the downstream region of the shutter plate, the flow disturbance can be suppressed, and the resistance to the fluid and the noise and vibration caused by the disturbance can be reduced. Have

  In addition, the shutter mechanism has an anti-separation thickness on the outer periphery of the upstream area of the shutter plate, and when the shutter is open, the fluid that collides with the upstream area of the shutter plate is suppressed and the fluid is smoothed. It can be guided to the plate, can suppress the turbulence of the flow, and has an effect that the resistance to the fluid and the noise and vibration caused by the turbulence can be reduced.

  Further, it is used for a cylindrical pipe line, and when the shutter is closed, a shutter mechanism in which the vertical projection shape of the outer periphery of the shutter plate to the projection plane perpendicular to the pipe axis is a circle is used. Even for a circular pipe generally used as a pipe of a blower, the disturbance of the flow can be suppressed, and the resistance to the fluid and the noise and the vibration caused by the disturbance can be reduced.

  In addition, the rotation axis projection line projected on the circular cross section of the pipe line is a shutter mechanism in which the center bisector of the center line connecting the center of the pipe line and the outer wall is used, and the outer shape of the shutter plate is It can be minimized, and the amount of the shutter plate material and the thickness of the production mold can be reduced, and the product cost can be reduced.

  In addition, when there is no fluid flow, the shutter plate is a shutter mechanism that rotates in its closed state by its own weight, and parts for rotating the shutter plate can be made unnecessary. It has the effect that the cost can be reduced.

  In addition, the shutter plate is rotated by mechanical external force, and a shutter mechanism that can maintain the open or closed position regardless of the fluid pressure state ensures that the shutter plate is always in the optimal position. It is possible to prevent the shutter plate from flapping and generating noise and vibration when the fluid pressure fluctuates, and the shutter plate can be reliably rotated regardless of the installation direction of the shutter mechanism. Therefore, it has the effect that the resistance to the fluid and the noise and vibration caused by the disturbance can be reduced.

  In addition, the part including the shutter mechanism of the pipeline is installed horizontally, and the rotation axis is a shutter mechanism having a predetermined angle with respect to the horizontal plane, and the torque required to rotate the shutter plate is reduced. Therefore, when the shutter plate is rotated by the pressure of the fluid, it can be rotated at a smaller pressure, so that the resistance to the fluid can be reduced, and the shutter plate is mechanically rotated. , It has the effect | action that the energy which rotation requires can be suppressed.

  In addition, the pipeline is regarded as a set of a plurality of divided pipelines, and each of the divided pipelines has a shutter mechanism, and the size of the shutter plate can be reduced and the flow velocity in the pipeline is fast. Since only the shutter plate can be rotated, the torque required to rotate the shutter plate can be reduced, and when the shutter plate is rotated by the fluid pressure, it is rotated with a smaller pressure. Therefore, the resistance to the fluid can be reduced, and when the shutter plate is mechanically rotated, the energy required for the rotation can be suppressed.

  In addition, the shutter mechanism is provided with a protruding part from the pipeline upstream of the shutter plate so that fluid does not flow in the back channel, and the fluid collides with the upstream region of the shutter plate and the shutter is opened. Therefore, the torque required to rotate the shutter plate can be reduced, and when the shutter plate rotates due to the pressure of the fluid, a smaller pressure can be used. Since it can be rotated, the resistance to the fluid can be reduced, and when the shutter plate is mechanically rotated, the energy required for the rotation can be suppressed.

  In addition, the cross-sectional shape of the protruding portion from the pipe line in a plane passing through the pipe axis is a shutter mechanism in which the protruding height increases for a while from upstream to downstream, Since the fluid can be smoothly guided to the path, there is an effect that resistance to the fluid and noise and vibration due to turbulence can be reduced.

  Further, when the shutter is closed, the entire outer periphery of the shutter plate facing the pipe line is a shutter mechanism that comes into contact with the inner peripheral wall projecting at a predetermined height from the pipe line. This has the effect of eliminating the gap and improving the blockage.

  In addition, the shutter mechanism used in the blower blowout or suction conduit using air as a fluid can reduce the load on the blower by suppressing the resistance in the shutter mechanism, thus reducing the rotation required by the blower. It has the effect | action that it can reduce and the noise which generate | occur | produces the electric power of a fan or a fan can be reduced.

  In addition, the shutter mechanism is provided inside the adapter that connects the discharge port of the blower and the duct. Since the shutter mechanism can be integrated with the blower, there is no need to provide a shutter mechanism in the middle of the pipeline. And, it has an effect that a low-cost air duct can be constructed.

  In addition, the vertical projection of the back channel to the projection plane perpendicular to the pipe axis is a shutter mechanism that does not overlap with the vertical projection of the blower outlet, and most of the airflow from the blower outlet is reduced. It can be made to flow into the surface flow path, and it has the effect that the collision of the airflow to the upstream region of the shutter plate can be suppressed and the resistance to the airflow and the noise and vibration caused by the disturbance can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 to 3, a pipeline 2 surrounded by a cylindrical outer wall 1 having an inner diameter of 100 mm is horizontally installed with a straight pipeline shaft 3, and one end of the discharge port of the blower 4. 5, and two pins 8 that are inserted into mounting holes 7 provided in the shutter plate 6 and hold the shutter plate 6 are provided on the same straight line on the inner surface of the pipe line 2. A stopper 10 for limiting the rotation of the shutter plate 6 that forms the moving shaft 9 is provided. The shutter plate 6 closes the conduit 2 (hereinafter referred to as the shutter closed state), and the blower 4 It is possible to turn to an open state (hereinafter referred to as a shutter open state) in which the pipe line 2 is opened in order to allow the air flow 11 to pass therethrough, and a shutter mechanism that prevents the backflow 12 from the other end of the pipe line 2 is formed. is doing. The rotation axis projection line 13 obtained by projecting the rotation axis 9 onto the circular section of the pipe line 2 has an angle θ of 30 degrees above the horizontal center line 14 on the circular section, and the center of the circular section and the outer wall 1. It is a perpendicular bisector of the line segment 15 that connects.

  The outer periphery 16 of the shutter plate 6 is constant at a distance of 2 mm from the outer wall 1 when the shutter is closed, and the vertical projection shape of the outer periphery 16 of the shutter plate 6 on the projection plane perpendicular to the pipe axis 3 is circular. It has become.

  Further, in the shutter plate 6, when a portion upstream of the rotating shaft 9 when the shutter is opened is an upstream region 17, and a downstream portion is a downstream region 18, the pipe shaft 3 in the downstream region 18 The outer peripheral shape of the cross section in the vertical arbitrary plane is an arc shape maintaining a distance of 2 mm from the outer wall 1, and the cross section of the upper plane 17 of the shutter plate 6 in the cross section in the arbitrary plane passing through the pipe axis 3 at that time And the cross section of the downstream region 18 are smoothly connected by a circular arc.

  In the above configuration, since the shutter plate 6 has a larger area in the downstream region 18, when the blower 4 starts operation, the downstream region 18 receives a larger wind pressure than the upstream region 17, and thus rotates to an open state. However, when the shutter stops, the pipe 2 is rotated by the gravity acting on the downstream region 18 so that the pipe 2 is closed by the shutter plate 6 and the back channel 20 having a small area and a front channel 19 having a large area. Are divided into two flow paths.

  In general, the air flow 11 flowing through the tubular pipe line 2 may have a velocity distribution represented by the following equation called the Kalman-Prandtl power law by the frictional force of the outer wall 1 of the pipe line 2. Are known. The velocity distribution is shown in FIG.

u / umax = (y / r) ^ (1/7)
Here, r is the radius of the circular tube, y is the distance from the outer wall of the circular tube toward the center, 0 ≦ y ≦ r, u is the flow velocity at y, and umax is the maximum flow velocity.

  As can be seen from this equation, the air flow 11 in the pipe 2 has a flow velocity distribution in which the flow velocity at the center is the fastest and the flow velocity becomes slower as the outer wall 1 is approached. Since the area becomes larger than the larger area of the cross-sectional area of the pipe line 2 divided by the rotation axis projection line 13 obtained by projecting the rotation axis 9 perpendicularly to an arbitrary plane, the outer periphery 16 of the upstream region 17 has a fluid flow velocity. Is not located in the fast range, and can be located in the region where the flow velocity is slow, so that the air flow 11 having a high flow velocity is prevented from colliding with the outer periphery 16 of the upstream region 17 of the shutter plate 6, and the turbulence of the air flow 11 is prevented. Therefore, it is possible to reduce the resistance to the airflow 11 and the noise and vibration caused by the turbulence.

  More specifically, as shown in the drawing, the effect can be obtained if the outer periphery 16 of the upstream region 17 is located in the region on the outer wall 1 side from 70% of the inner diameter of the circular conduit 2 as a region where the flow velocity is slow.

  Further, since the cross section in an arbitrary plane passing through the pipe axis 3 has a shape in which the cross section of the upstream region 17 of the shutter plate 6 and the cross section of the downstream region 18 are smoothly connected by an arc, the upstream of the shutter plate 6 The air flow 11 can be smoothly guided from the region 17 to the downstream region 18, turbulence of the air flow 11 can be suppressed, and resistance to the air flow 11, noise and vibration due to the turbulence can be reduced.

  It should be noted that the same effect can be obtained if the shape is such that it is guided smoothly instead of an arc.

  Further, when the shutter is closed, the outer periphery 16 of the shutter plate 6 is separated from the outer wall 1 by a minimum distance of 2 mm, which is necessary and minimum to prevent the shutter plate 6 from adhering to the outer wall 1 due to dust or oil. Moreover, since it is parallel to the outer wall 1, the area of the shutter plate 6 can be increased to the maximum, and the closing property can be improved.

  Further, since the rotation axis projection line 13 obtained by projecting the rotation axis 9 onto the circular cross section of the pipe line 2 has an angle θ of 30 degrees above the horizontal center line 14 on the circular cross section, the shutter plate 6 The gravity applied to the downstream region 18 is reduced, the torque required to rotate the shutter plate 6 can be reduced, and the resistance to the airflow 11 can be reduced.

  Further, the rotation axis projection line 13 obtained by projecting the rotation axis 9 onto the circular cross section of the pipe line 2 is a perpendicular bisector of the line segment 15 connecting the center of the circular cross section and the outer wall, so that the shutter is opened. Since the outer shape of the shutter plate 6 required to increase the area of the surface channel 19 and close the pipe line 2 when the shutter is closed is minimized, the amount of the material of the shutter plate 6 and the thickness of the production die are reduced. The product cost can be reduced.

  Further, since the vertical projection shape of the outer periphery 16 of the shutter plate 6 onto the projection plane perpendicular to the pipe axis 3 is circular, the disturbance of the flow is suppressed even for a circular pipe generally used as a pipe of a pump or a blower. It is possible to reduce the resistance to the fluid and the noise and vibration caused by the disturbance.

  Moreover, since resistance in the shutter mechanism unit can be suppressed and the load on the blower 4 can be reduced, rotation required by the blower 4 can be reduced, and the electric power of the blower 4 and noise generated from the blower 4 can be reduced. it can.

(Embodiment 2)
As shown in FIG. 5, a thickness 21 is added to the outer periphery 16 of the upstream region 17 of the shutter plate 6.

  In the above configuration, when the shutter is open, the separation of the airflow 11 that collides with the upstream region 17 of the shutter plate 6 can be suppressed, and the airflow 11 can be smoothly guided to the shutter plate 6, thereby suppressing the turbulence of the airflow 11. It is possible to reduce the resistance to the airflow 11 and the noise and vibration caused by the turbulence.

(Embodiment 3)
As shown in FIG. 6, an electric motor 22 that rotates the shutter plate 6 is provided outside the pipeline 2.

  In the above configuration, the shutter plate 6 is rotated to the open or closed position by the electric motor 22 so that the shutter plate 6 is always in the optimum position regardless of the pressure state received by the airflow 11. It can be held, and when the pressure of the airflow 11 fluctuates, the shutter plate 6 can be prevented from flapping and generating noise and vibration, and the shutter plate 6 can be reliably rotated regardless of the installation direction of the shutter mechanism. Since it can move, the resistance to the air flow 11 and the noise and vibration caused by the turbulence can be reduced.

  The electric motor 22 is a stepping motor or a gear motor, and the same effect is sold by a mechanical external force such as a solenoid.

(Embodiment 4)
As shown in FIG. 7, the two shutter plates 6 are provided in the upward pipeline 2 where the two airflows 11 merge on the upstream side of the shutter mechanism so that the positions corresponding to the two airflows 11 do not overlap each other. The shutter plate 6 is configured to freely rotate with respect to each other.

  In the above configuration, since the two shutter plates 6 can open and close the flow paths having the area that bisects the pipeline 2, the size of the shutter plate 6 can be reduced, and the flow velocity in the pipeline 2 can be reduced. Since only the shutter plate 6 in the fast region can be rotated, the torque required to rotate the shutter plate 6 can be reduced, and the shutter plate 6 can be rotated by a smaller air pressure 11 pressure. Therefore, the resistance to the airflow 11 can be reduced.

(Embodiment 5)
As shown in FIG. 8, the outer wall 1 of the pipe line 2 is provided with a protruding part 23 at a position where the back channel 20 is closed when the shutter is open. In the cross section of the plane passing through, the protrusion height increases for a while at an angle of 13 degrees from upstream to downstream.

  In the above configuration, the air flow 11 can be prevented from colliding with the upstream region 17 of the shutter plate 6 and acting in the opposite direction to the rotation to the shutter open state, so that the shutter plate 6 can be rotated. The required torque can be reduced, and the shutter plate 6 can be rotated by the pressure of the smaller air flow 11, so that the resistance to the air flow 11 can be reduced, and the shutter plate 6 can be mechanically rotated. In this case, energy required for rotation can be suppressed.

  Further, since the protrusion 23 has a shape in which the protrusion height increases for a while from the upstream to the downstream, the airflow 11 can be smoothly guided from the protrusion 23 to the surface flow path 19, Noise and vibration due to disturbance can be reduced.

(Embodiment 6)
As shown in FIG. 9, the inner peripheral wall 24 is provided on the outer wall 1 of the pipe line 2 and has a height of 3 mm which is larger than the distance 2 mm between the outer wall 1 and the outer periphery 16 of the shutter plate 6. It has a configuration provided with an inner peripheral wall 24 that contacts the outer periphery 16 of the shutter plate 6.

  In the above configuration, even when pressure is applied to the shutter plate 6 by the backward flow 12 from the downstream side, the inner peripheral wall 24 and the outer periphery 16 of the shutter plate 6 come into contact with each other, so that there is no gap, so that the closing property can be improved.

  If the projections of the inner peripheral wall 24 projected onto the projection plane perpendicular to the pipe axis 3 and the shutter plate 6 overlap, the outer periphery 16 of the shutter plate 6 and a part of the inner peripheral wall 24 are in contact with each other. However, the same effect can be obtained, and further, the inner peripheral wall 24 and the shutter plate 6 can be prevented from being fixed due to dust or oil.

(Embodiment 7)
As shown in FIG. 10, the blower 4 installed on the back of the ceiling for discharging the indoor air to the outside through a circular duct 25 includes a rectangular discharge port 5 of the blower 4 and a circular duct. 25 is provided, and an adapter 26 is provided, and a shutter mechanism is provided inside the adapter 26.

  In the above configuration, since the shutter mechanism can be integrated with the blower 4, it is not necessary to provide a shutter mechanism in the middle of the pipe line 2, and a blower pipe line that is easy to install can be constructed at low cost.

(Embodiment 8)
As shown in FIG. 11, the vertical projection of the back channel 20 onto the projection plane perpendicular to the pipe axis 3 is configured not to overlap the vertical projection of the discharge port 5 of the blower 4.

  In the above configuration, most of the air flow 11 from the discharge port 5 of the blower 4 can flow into the surface flow path 19, and the collision of the air flow 11 with the upstream region 17 of the shutter plate 6 is suppressed and resistance to the air flow 11 is achieved. In addition, noise and vibration caused by disturbance can be reduced.

  The present invention provides a shutter mechanism that suppresses noise and vibration due to fluid resistance and flow disturbance, has good blockage, and can be manufactured at low cost.

1A and 1B are diagrams showing a shutter mechanism according to a first embodiment of the present invention ((a) a sectional side view when the shutter is open, (b) a sectional side view when the shutter is closed) The figure which shows the shutter mechanism of Embodiment 1 of this invention ((a) The projection figure to a plane perpendicular | vertical to the pipe line axis | shaft at the time of a shutter open state, (b) It is perpendicular to the pipe line axis | shaft at the time of a shutter closed state Projection onto the surface) The perspective view which shows the shutter board of Embodiment 1 of this invention. The figure which shows the velocity distribution of the airflow in the pipe line of Embodiment 1 of this invention. Sectional side view which shows the shutter mechanism of Embodiment 2 of this invention. FIG. 6 is a projection view onto a plane perpendicular to the pipe axis showing the shutter mechanism according to the third embodiment of the present invention. The figure which shows the shutter mechanism of Embodiment 4 of this invention ((a) Side sectional view at the time of shutter opening state, (b) Side sectional view at the time of shutter closed state) Sectional side view which shows the shutter mechanism of Embodiment 5 of this invention. The figure which shows the shutter mechanism of Embodiment 6 of this invention ((a) The projection figure to a plane perpendicular | vertical to the pipe line axis | shaft at the time of shutter opening state, (b) It is perpendicular | vertical to the pipe line axis | shaft at the time of shutter closed state Projection onto the surface) FIG. 10 is an exploded perspective view showing a shutter mechanism according to an eighth embodiment of the invention. FIG. 10 is a projection view onto a plane perpendicular to the pipe axis showing the grill of the shutter mechanism according to the eighth embodiment of the present invention. The figure which shows the conventional shutter mechanism ((a) sectional side view, (b) shutter plate perspective view)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer wall 2 Pipeline 3 Pipeline shaft 4 Blower 5 Discharge port 6 Shutter plate 7 Mounting hole 8 Pin 9 Rotating shaft 10 Stopper 11 Airflow 12 Backflow 13 Rotating shaft projection line 14 Center line θ Angle 15 Line segment 16 Outer periphery 17 Upstream Area 18 Downstream area 19 Front flow path 20 Back flow path 21 Thickness 22 Electric motor 23 Projection part 24 Inner peripheral wall 25 Duct 26 Adapter

Claims (19)

It is provided in a pipe line surrounded by an outer wall, can be rotated around a rotation axis, and can be positioned in a closed state in which the pipe line is closed and in an open state in which the pipe is opened. A shutter plate that divides the path into two channels, a front channel with a large area and a small channel behind the channel, is opened when the fluid flowing through the channel has a velocity distribution in a plane perpendicular to the channel axis. A shutter mechanism in which the outer periphery of the upstream region of the shutter plate that is upstream of the rotation shaft in the state is not located in a range where the fluid flow velocity is fast. It is provided in a pipe line surrounded by an outer wall, can be rotated around a rotation axis, and can be positioned in a closed state in which the pipe line is closed and in an open state in which the pipe is opened. A shutter plate that divides the path into two channels, a front surface channel with a large area and a small back channel, and when the shutter is open, the surface channel on the cross section in an arbitrary plane perpendicular to the pipe axis The shutter mechanism is configured such that the cross-sectional area of the pipe is larger than the area of the larger cross-sectional area of the pipe divided by the rotation axis projection line obtained by projecting the rotation axis perpendicularly to the arbitrary plane. When the shutter is open, the downstream area of the shutter plate, which is downstream from the rotation axis, is on a cross section in an arbitrary plane perpendicular to the pipe axis when the shutter is open, and the outer peripheral shape of the cross section is a predetermined distance from the pipe. The shutter mechanism according to claim 1 or 2, which is substantially parallel. The shutter mechanism according to any one of claims 1 to 3, wherein the outer periphery of the downstream area of the shutter plate is constant at a predetermined distance from the pipe line when the shutter is closed. The shutter mechanism according to any one of claims 1 to 4, wherein the outer periphery of the upstream region of the shutter plate that is upstream from the rotating shaft when the shutter is open is constant at a predetermined distance from the pipe line when the shutter is closed. . 6. The shutter mechanism according to claim 5, wherein the cross-sectional shape of the shutter plate in an arbitrary plane passing through the pipe axis is such that the cross-sectional shape of the upstream region of the shutter plate is smoothly connected to the cross-sectional shape of the downstream region by an arc or a plurality of arcs. . The shutter mechanism according to claim 5 or 6, wherein the shutter plate has an anti-separation thickness on the outer periphery of the upstream region of the shutter plate. The shutter according to any one of claims 1 to 7, wherein the shutter is used in a cylindrical pipe line, and when the shutter is in a closed state, the vertical projection shape of the outer periphery of the shutter plate on the projection plane perpendicular to the pipe axis is circular. mechanism. The shutter mechanism according to claim 8, wherein the rotation axis projection line projected on the circular cross section of the pipe line is a perpendicular bisector of the center line connecting the center of the pipe line and the outer wall. The shutter mechanism according to claim 1, wherein when there is no fluid flow, the shutter plate rotates to its closed state by its own weight. The shutter mechanism according to any one of claims 1 to 9, wherein the shutter plate is rotated by a mechanical external force and can maintain the position of the open state or the closed state regardless of the state of the pressure of the fluid. The shutter mechanism according to any one of claims 1 to 11, wherein a portion of the conduit including the shutter mechanism is installed horizontally, and the rotation axis has a predetermined angle with respect to a horizontal plane. A shutter mechanism having the mechanism according to any one of claims 1 to 12 for each of the divided pipelines, with the pipeline regarded as a set of a plurality of divided pipelines. The shutter mechanism according to any one of claims 1 to 13, wherein a protrusion from the pipe line is provided upstream of the shutter plate so that fluid does not flow through the back channel. The shutter mechanism according to claim 14, wherein a cross-sectional shape of the protruding portion from the pipe line in a plane passing through the pipe axis is a shape in which the protruding height temporarily increases from upstream to downstream. The shutter mechanism according to any one of claims 1 to 15, wherein when the shutter is closed, the entire outer periphery of the shutter plate facing the pipe line is in contact with an inner peripheral wall protruding at a predetermined height from the pipe line. The shutter mechanism according to any one of claims 1 to 16, wherein air is used as a fluid in a blower blowout or suction pipe. The shutter mechanism according to claim 17, which is provided inside an adapter that connects a discharge port of a blower and a duct. 19. The shutter mechanism according to claim 18, wherein the vertical projection of the back channel onto the projection plane perpendicular to the pipe axis does not overlap with the vertical projection of the discharge port of the blower.

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