JP5996509B2 - Flow control device - Google Patents

Description

  The present invention relates to a flow rate adjusting device that adjusts the opening degree of a fluid flow path such as air formed inside an air supply pipe or the like.

  Conventionally, in sewage treatment and the like, a device for adjusting the amount of air supplied to an aeration tank is provided. For example, as shown in FIG. 7, the air discharged from the aeration blower 101 is supplied into the aeration tank 104 from the aeration device 103 attached to the tip of the air supply pipe 102, and the sewage is purified by aerobic microorganisms. The air supply pipe 102 is provided with an air volume adjusting valve 105, and the air volume supplied to the aeration tank 104 is adjusted to an appropriate volume by the air volume control. This air volume control is performed by detecting the dissolved oxygen (DO) concentration in the aeration tank 104 with the DO meter 106.

  In addition, when the DO value detected by the DO meter 106 is transmitted to the control device 107 and the DO value is lower than the set value, a command to increase the opening degree of the air volume adjustment valve 105 from the control device 107 to the electric oil operating device 108. A signal is transmitted. The electro-oil operating device 108 that has received this command signal increases the opening of the air volume adjusting valve 105 to increase the air volume, and the DO value in the aeration tank 104 increases. When the DO value is higher than the set value, a command signal for reducing the opening degree of the air volume adjusting valve 105 is transmitted from the control device 107 to the electric oil operating device 108. The electro-oil operating device 108 that has received this command signal reduces the opening of the air volume adjusting valve 105 to reduce the air volume and lower the DO value in the aeration tank 104.

  In general, a butterfly valve or the like is used as an air volume adjusting valve for an aeration blower in such a sewage treatment plant. For example, as shown in FIG. 8, a conventional butterfly valve 110 is provided with a valve body 112 for opening and closing a flow path in a valve box 111. The valve body 112 is fixed to a valve rod 113 that is a valve body rotation shaft, and is set so as to rotate integrally with the valve rod 113 in a range of 0 to 90 degrees. One end of a lever arm 114 is fixed to one end of a valve rod 113 protruding from the valve box 111 so as to rotate integrally therewith. The other end of the lever arm 114 is connected to the drive arm 116 of the electro-hydraulic operating device 115 by a link rod 117.

  For example, in the butterfly valve 110, when the drive arm 116 of the electro-hydraulic operation device 115 is in the position A in FIG. 8, the lever arm 114 is set to be in the position A1. At this time, the valve body 112 is parallel to the flow direction, and the butterfly valve 110 is fully opened. When the drive arm 116 is rotated 90 degrees and moved to the position B, the lever arm 114 is also rotated 90 degrees and moved to the position B1. At this time, the valve body 112 is also simultaneously rotated and orthogonal to the flow direction, and the butterfly valve 110 is fully closed.

  Thus, the drive arm 116 of the electro-hydraulic operation device 115 is set to rotate from position A to position B at a constant speed, and conversely from position B to position A in the range of 0 to 90 degrees. Accordingly, the power of the drive arm 116 is transmitted from the link rod 117 to the lever arm 114 so that the valve rod 113 and the valve body 112 are rotated so that the opening degree of the butterfly valve 110 is changed. By adjusting to, the air volume is adjusted. The technical idea of such a link mechanism is disclosed in Patent Document 1, for example.

Japanese Utility Model Publication No.2-130485

In the above conventional technique, the following problems remain.
That is, in the above conventional technique, as shown in FIG. 9, the opening degree of the valve body and the flow rate are not proportional, and the flow rate change rate with respect to the change in the opening degree is small near the fully opened side where the opening degree is large, In the vicinity of the fully closed side where the opening is small, the flow rate characteristic is such that the flow rate change rate with respect to the change of the opening becomes large. Therefore, fine adjustment of the opening degree is necessary to adjust to a desired flow rate in the vicinity of the fully closed side. That is, in the case of the conventional butterfly valve 110, the drive arm 116 of the electro-hydraulic actuator 115 and the lever arm 114 of the butterfly valve 110 rotate at the same speed (angular speed), so that the opening degree changes near the fully open side. Even if the flow rate change rate with respect to is small and the rotation speed is large, there is no great difficulty in adjusting the flow rate. However, since it is difficult to finely adjust the opening in the vicinity of the fully closed side where the flow rate change rate with respect to the change in opening is large, there is a problem that it is difficult to adjust the air volume appropriately. For this reason, in the sewage treatment plant, there has been a problem that a hunting phenomenon occurs in which the opening adjustment of the air volume adjustment valve is frequently performed in order to properly maintain the DO concentration in the aeration tank. In order to prevent this hunting phenomenon, measures are taken to increase the air volume and maintain the DO in the aeration tank at a higher concentration than necessary, but the consumption power of the aeration blower increases accordingly, and the energy consumption There is a problem that leads to an increase.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a flow rate adjusting device that can increase the rotation speed of the lever arm near the fully open side and slow down near the fully closed side. .

  The present invention employs the following configuration in order to solve the above problems. That is, the flow rate adjusting device according to the first invention is rotated by having a casing in which a fluid flow path is formed inside and a valve body rotating shaft provided in the casing and penetrating the casing. A valve body for changing an opening degree of the fluid flow path; and a base end fixed to the valve body rotation shaft outside the casing and extending in a direction perpendicular to the valve body rotation shaft; A lever arm that rotates together with a rotation shaft, a link rod having one end attached to the lever arm, a drive unit that is attached to the other end of the link rod and moves the link rod back and forth, the lever arm and the link A guide mechanism for moving the attachment portion with the rod along the lever arm according to the rotation angle of the lever arm, and the guide mechanism rotates the lever arm in a direction in which the opening degree increases. When The mounting portion is moved to the proximal end side of the lever arm, and the mounting portion is moved to the distal end side of the lever arm when the lever arm is rotated in a direction in which the opening degree is reduced. To do.

  In this flow rate adjusting device, when the guide mechanism rotates the lever arm in the direction in which the opening degree increases, the attachment portion moves to the base end side of the lever arm, and the lever arm rotates in the direction in which the opening degree decreases. Since the attachment portion is moved toward the distal end side of the lever arm when moving, the rate of change in rotation of the lever arm with respect to the advancement / retraction of the link rod becomes smaller as the opening becomes smaller, and fine adjustment of the opening becomes easier. That is, as the opening becomes smaller, the attachment portion is positioned on the distal end side of the lever arm. Therefore, when the attachment portion is located on the proximal end side of the lever arm with respect to the amount of advancement / retraction of the link rod (opening degree) Is smaller than the case (when is larger), it becomes easier to finely adjust the opening. Further, when the link rod is advanced and retracted at a constant speed, the rotation speed of the valve body rotation shaft becomes lower as the opening degree becomes smaller. Furthermore, the smaller the opening, the longer the distance between the mounting portion and the valve body rotation shaft, so the torque of the valve body rotation shaft increases. When fully closed, the valve body is pressed against the valve seat with a strong force. High sealing performance. Therefore, since a high torque can be obtained, the leakage prevention effect is enhanced and the drive unit can be downsized.

According to a second aspect of the present invention, in the flow control device according to the first aspect, the guide mechanism has a rod-shaped or long-plate-shaped guide member fixed to the outside of the casing, and the guide member has one end side of the guide member. The lever arm is disposed at the base end side of the lever arm when the lever arm is rotated to the position where the opening is maximized, and the lever arm is rotated to the position where the opening is the minimum at the other end. It is arranged on the tip end side of the lever arm at the time of being moved, and the mounting portion is connected to both the lever arm and the guide member at a position where the lever arm and the guide member overlap with each other and is movably mounted along both of them. It is characterized by that.
That is, in this flow rate adjusting device, the attachment portion connects both the lever arm and the guide member at a position where they overlap, and is attached so as to be movable along both of them. Is regulated by the connected guide member. Therefore, the opening degree can be adjusted according to the positional relationship between the guide member and the lever arm.

According to a third aspect of the present invention, there is provided the flow rate adjusting device according to the second aspect, wherein the guide member extends in a convex curved shape toward the valve body rotation shaft.
That is, in this flow rate adjusting device, since the guide member extends in a convex curved shape toward the valve body rotation axis, the opening degree is larger than that in the case where the guide member extends linearly. The smaller the is, the smaller the rate of change in the rotation of the lever arm with respect to the advance and retreat of the link rod, and a finer adjustment of the opening becomes possible. Therefore, finer adjustment of the flow rate is possible.

According to a fourth aspect of the present invention, in the second or third aspect, the guide member has a guide-side long hole formed along the extending direction, and the lever arm extends in the extending direction. A pin having an arm-side long hole formed along the guide hole, and the attachment portion is inserted into both the guide-side long hole and the arm-side long hole so as to be movable along the long hole. It is a member.
That is, in this flow rate adjusting device, the attachment portion is a pin member that is inserted into both the guide side long hole and the arm side long hole and is movably attached along these long holes. The opening of the lever member can be adjusted smoothly by the mounting portion of the pin member guided by the lever.

According to a fifth aspect of the present invention, in the second or third aspect, the attachment portion includes a cylindrical arm-side slide portion that is slidable on the lever arm through which the lever arm is inserted; A cylindrical guide-side slide portion that is inserted through the guide member and is slidable on the guide member, and the arm-side slide portion and the guide-side slide portion are connected to each other so as to be rotatable. Features.
That is, in this flow rate adjusting device, the mounting portion includes a cylindrical arm side slide portion that can slide on the lever arm and a cylindrical guide side slide portion that can slide on the guide member, and the arm side slide. And the guide side slide part are connected to each other so that the arm side slide part slides on the lever arm, and at the same time, the guide side slide part that is rotatable relative to the arm side slide part is a guide member. By sliding the top, the opening degree can be adjusted by smoothly rotating the lever arm.

The present invention has the following effects.
That is, according to the flow rate adjusting device of the present invention, when the guide mechanism rotates the lever arm in the direction in which the opening degree increases, the attachment portion moves to the base end side of the lever arm and the opening degree decreases. When the lever arm is rotated in the direction, the attachment portion is moved to the tip side of the lever arm. Therefore, the opening degree can be finely adjusted and the rotation speed of the valve body rotation shaft is reduced as the opening degree is reduced. Further, the smaller the opening, the greater the torque of the valve body rotation shaft, which increases the leakage prevention effect and allows the drive unit to be miniaturized.
Therefore, the flow rate adjusting device of the present invention is less likely to cause a hunting phenomenon and is suitable for adjusting the air volume for an aeration blower for sewage treatment.

1 is a structural diagram showing a first embodiment of a flow control device according to the present invention. FIG. 5 is a structural diagram showing a second embodiment of the flow rate adjusting device according to the present invention. FIG. 5 is a structural diagram showing a third embodiment of a flow rate adjusting device according to the present invention. In 3rd Embodiment, it is a perspective view which shows an attaching part. FIG. 6 is a structural diagram showing a fourth embodiment of a flow rate adjusting device according to the present invention. FIG. 9 is a structural diagram showing a fifth embodiment of a flow rate adjusting device according to the present invention. It is the schematic which shows the air supply system to the aeration tank of a sewage process. It is a structural diagram showing a conventional example of a flow rate adjusting device according to the present invention. It is a graph which shows the relationship between the flow volume and opening degree in a prior art example.

  Hereinafter, a first embodiment of a flow control device according to the present invention will be described with reference to FIG.

  The flow rate adjusting device 1 in the present embodiment is used for adjusting the air volume for an aeration blower in a sewage treatment plant, for example, and as shown in FIG. 1, a casing 2 having a fluid flow path L such as air formed therein. A valve body 3 that is provided in the casing 2 and has a valve body rotation shaft 3 a that passes through the casing 2 and rotates to change the opening degree of the fluid flow path L. The base end is fixed to the moving shaft 3 a and extends in a direction perpendicular to the valve body rotating shaft 3 a and rotates with the valve body rotating shaft 3 a, and the lever arm 4 has one end Is attached to the other end side of the link bar 5, the drive unit 6 for moving the link bar 5 back and forth, and the mounting portion 7 of the lever arm 4 and the link bar 5 is connected to the rotation angle of the lever arm 4. Guide mechanism to move along the lever arm 4 according to the It is equipped with a door.

The drive unit 6 has a drive arm 9 having a tip attached to the other end of the link rod 5 and an arm rotation shaft 10 fixed to the base end of the drive arm 9 and perpendicular to the extending direction of the drive arm 9. And a drive machine main body 11 for rotating the drive arm 9 within a predetermined angle range.
The guide mechanism 8 moves the mounting portion 7 to the base end side of the lever arm 4 when rotating the lever arm 4 in the direction in which the opening degree increases, and rotates the lever arm 4 in the direction in which the opening degree decreases. It is set so that the mounting portion 7 is moved to the distal end side of the lever arm 4 when moving.

  More specifically, the guide mechanism 8 has a long plate-shaped guide member 12 fixed to the outside of the casing 2, and the guide member 12 has a lever arm 4 at a position where the opening degree is maximized on one end side. Is arranged on the base end side of the lever arm 4 when the lever is rotated, and the other end side is arranged on the distal end side of the lever arm 4 when the lever arm 4 is rotated to a position where the opening degree is the smallest. Has been.

Further, the attachment portion 7 is attached so that both of the lever arm 4 and the guide member 12 are connected to each other at a position where the lever arm 4 and the guide member 12 overlap with each other, and is movable along the both.
The guide member 12 has a guide-side long hole 12a formed along the extending direction. The lever arm 4 has an arm side long hole 4a formed along the extending direction. Further, the mounting portion 7 is a pin member that is inserted into both the guide side long hole 12a and the arm side long hole 4a and is movably mounted along these long holes. The pin member mounting portion 7 is attached with bolts or the like larger than the width of the two long holes at both ends so that the pin member mounting portion 7 does not come out when inserted into the two long holes.

The guide member 12 is longer than the lever arm 4, and the guide side long hole 12a is formed longer than the arm side long hole 4a.
Further, one end of the link bar 5 is rotatably connected to a mounting portion 7 that is a pin member.
The driving machine 6 is an electro-hydraulic operating machine, and the other end of the link bar 5 is rotatably connected to the tip of the driving arm 9. The drive arm 9 rotates in the range of 0 to 90 degrees from the position X (position when fully opened) to the position Z (position when fully closed), and power is transmitted to the mounting portion 7 via the link rod 5. The

The valve body 3 is a butterfly valve, for example, and is set so as to abut a valve seat (not shown) when the valve is fully closed to completely close the fluid flow path L. The valve body 3 rotates integrally with the valve body rotation shaft 3a in the range of 0 to 90 ° C.
The casing 2 is a valve box attached in the middle of the air supply pipe.
The guide member 12 is fixed to the side surface of the casing 2 by a plurality of bolts 2a so as to intersect the lever arm 4, and the fluid flow path L is within the rotation range of the lever arm 4 from the fully open state to the fully closed state. With a predetermined angle. For example, when the lever arm 4 is at the position X1 (position when fully opened), the intersection angle θ between the lever arm 4 and the guide member is set to 110 °.
In FIG. 1, the direction of the arrow from the bottom to the top is the direction in which the fluid flows.

Next, a flow rate adjustment method in the flow rate adjustment device 1 of the present embodiment will be described.
First, when the drive arm 9 is in the position X, the lever arm 4 is in the fully open position of the position X1, and the valve body 3 is in the fully open state. In this fully open state, the mounting portion 7 is at the position O and is close to the base end side (the valve body rotating shaft 3a side) of the arm side long hole 4a and at the same time the base end side (valve of the guide side long hole 12a) Near the body rotation shaft 3a side).

  When the drive arm 9 is rotated 45 degrees from the position X to the center position Y from this state, the attachment portion 7 moves from the position O to the center position P of the guide side long hole 12a along the guide side long hole 12a, and is attached at the same time. The part 7 moves from a position O close to the base end side of the arm side long hole 4a to a position P far from the axis of the valve body 3, and the lever arm 4 rotates from the position X1 to the position Y1. That is, when the drive arm 9 is rotated 45 degrees from the position X to the center position Y, the lever arm 4 is rotated from the fully open position X1 to the position Y1, but the position Y1 is not the center position of the lever arm 4 but the center position. At a position closer to the fully closed side than the position, the rotation angle of the lever arm 4 is greater than 45 degrees.

  Further, when the drive arm 9 is rotated from the center position Y to the position Z, the mounting portion 7 is moved from the center position P to the position Q of the guide side long hole 12a. At the same time, the mounting portion 7 moves from the position P of the arm side long hole 4a to the position Q near the tip (farthest from the axis of the valve body rotation shaft 3a), so that the lever arm 4 is moved from the position Y1 to the fully closed position Z1. Until the valve body 3 is fully closed. That is, when the drive arm 9 rotates 45 degrees from the center position Y to the position Z, the lever arm 4 rotates from the position Y1 to the fully closed position Z1, but the rotation angle from the position Y1 to the fully closed position Z1. Is smaller than 45 degrees.

  In this way, the rotation speed of the drive arm 9 and the movement speed of the mounting portion 7 that moves through the guide side long hole 12a are constant, but as the lever arm 4 rotates from the fully open side to the fully closed side, The moving speed becomes slow. Therefore, the rotation speed of the lever arm 4 is slower than the rotation speed of the drive arm 9 in the vicinity of the fully closed side where the flow rate change rate with respect to the change of the opening is large. It can be adjusted to a desired flow rate. That is, since the attachment portion 7 is positioned closer to the distal end side of the lever arm 4 as the opening degree becomes smaller, the rotation angle of the lever arm 4 with respect to the advance / retreat amount of the link bar 5 (that is, the rotation angle of the drive arm 9) When the portion 7 is located on the base end side of the lever arm 4 (when the opening degree is large), it becomes easier to finely adjust the opening degree.

Further, in the vicinity of the fully opened side where the flow rate change rate with respect to the change of the opening is small, the rotational speed of the lever arm 4 is larger than the rotational speed of the drive arm 9, so that the opening degree adjustment in the vicinity of the fully opened side can be made faster. It can be carried out.
Further, when the lever arm 4 rotates from the fully open side to the fully closed side, the attachment portion 7 starts from the position close to the base end of the arm side long hole 4a (the axis of the valve body rotation shaft 3a) (the valve body rotation). By rotating the lever arm 4 while moving to a position far from the axial center of the moving shaft 3a, the torque of the lever arm 4 on the fully closed side can be increased.

  In other words, the smaller the opening, the longer the distance between the mounting portion 7 and the valve body rotation shaft 3a, and the greater the torque of the valve body rotation shaft 3a. Therefore, the valve body 3 is stronger against the valve seat when fully closed. High sealing performance can be obtained by pressing with force. Therefore, since a high torque can be obtained, the leakage prevention effect is enhanced and the drive unit can be downsized.

  As described above, in the flow rate adjusting device 1 of the present embodiment, the guide mechanism 8 moves the attachment portion 7 to the base end side of the lever arm 4 when rotating the lever arm 4 in the direction in which the opening degree increases, When the lever arm 4 is rotated in the direction in which the opening degree is decreased, the attachment portion 7 is moved to the tip side of the lever arm 4, so that the rotation change of the lever arm 4 with respect to the rotation of the drive arm 9 is decreased as the opening degree is decreased. The rate becomes smaller and fine adjustment of the opening becomes easier.

  In addition, since the attachment portion 7 connects both the lever arm 4 and the guide member 12 at a position where they are overlapped and is movably attached along both, the degree of rotation of the lever arm 4 is It is regulated by the connected guide member 12. Therefore, the opening degree can be adjusted according to the positional relationship between the guide member 12 and the lever arm 4.

  Next, second to fifth embodiments of the flow regulating device according to the present invention will be described below with reference to FIGS. In the following description of each embodiment, the same constituent elements described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The difference between the second embodiment and the first embodiment is that, in the first embodiment, the guide member 12 has a linear long plate shape, whereas in the flow rate adjustment device 21 of the second embodiment, FIG. As shown in FIG. 2, the guide member 22 of the guide mechanism 28 has a long plate shape bent in an arc shape, and the guide side long hole 22a also extends in an arc shape. That is, in the second embodiment, the guide member 22 extends in a convex curved shape toward the valve body rotation shaft 3a. In the second embodiment, the distal end portion of the guide member 22 is fixed to the fixing member 4b attached to the casing 2 with the bolt 2a.

  In the second embodiment, the guide arm hole 22a is formed in a convex curved shape toward the valve body rotation shaft 3a, so that when the drive arm 9 rotates from the position X to the center position Y, the lever arm 4 can be rotated to a position closer to the fully closed side than in the first embodiment. Furthermore, since the rotation speed of the lever arm 4 near the fully closed side is slower than that of a linear slot, the opening can be finely adjusted closer to the fully closed side, and the flow rate on the fully closed side can be adjusted. The adjustment becomes easier.

  Thus, in 2nd Embodiment, since the guide member 22 is extended in the convex curve shape toward the valve body rotational axis 3a, compared with the case where the guide member 22 is extended linearly. Thus, the smaller the opening is, the smaller the rate of change of the rotation of the lever arm 4 with respect to the rotation of the drive arm 9 is, and finer adjustment of the opening is possible. Therefore, finer adjustment of the flow rate is possible.

  Next, the difference between the third embodiment and the first embodiment is that, in the first embodiment, the mounting portion 7 of the pin member is inserted and guided through the arm side long hole 4a and the guide side long hole 12a. On the other hand, in the flow rate adjusting device 31 of the third embodiment, as shown in FIGS. 3 and 4, in the guide mechanism 38, the mounting portion 37 has both a round bar-shaped lever arm 34 and a round bar-shaped guide member 32. It is a point that is guided by sliding on.

  That is, in the third embodiment, as shown in FIG. 4, the attachment portion 37 is inserted into the cylindrical arm side slide portion 37a through which the lever arm 34 is inserted and slidable on the lever arm 34, and the guide member 32 is inserted. The cylindrical guide side slide part 37b is slidable on the guide member 32, and the arm side slide part 37a and the guide side slide part 37b are connected to each other so as to be rotatable.

The arm-side slide portion 37a and the guide-side slide portion 37b are formed in a cylindrical shape by overlapping upper and lower halved cylindrical members. Note that the two halved cylindrical members that are overlaid are integrated by joining the divided surfaces with bolts or the like. The arm-side slide portion 37a and the guide-side slide portion 37b are connected by a connecting shaft 37c so as to be relatively rotatable around the axis. That is, the arm-side slide portion 37a and the guide-side slide portion 37b can be rotated about a direction orthogonal to the lever arm 34 and the guide member 32 as a rotation axis.
One end of the link bar 5 is rotatably connected to the arm side slide portion 37a.

  In this flow rate adjusting device 31, when the drive arm 9 is in the position X, the lever arm 34 is in the fully open position of the position X2, and the valve body 3 is in the fully open state. In this fully opened state, the attachment portion 37 is at the position O ′. When the drive arm 9 rotates 45 degrees from the position X to the center position Y from this state, the mounting portion 37 moves from the position O ′ of the guide member 32 to the center position P ′ of the guide member 32 (the center of the movement range). At the same time, the lever arm 34 rotates from the position X2 to the position Y2.

When the drive arm 9 is rotated 45 degrees from the position X to the central position Y, the lever arm 34 is rotated from the fully open position X2 to the position Y2. However, the position Y2 is not the central position of the lever arm 34 but from the central position. At the position close to the fully closed side, the rotation angle of the lever arm 34 is greater than 45 degrees.
Further, when the drive arm 9 is rotated from the central position Y to the position Z, the mounting portion 37 is moved from the central position P ′ to the position Q ′, and at the same time, the lever arm 34 is rotated from the position Y2 to the fully closed position Z2. The valve body 3 is fully closed. When the drive arm 9 rotates 45 degrees from the center position Y to the position Z, the lever arm 34 rotates from the position Y2 to the fully closed position Z2, but the rotation angle from the position Y2 to the fully closed position Z2 is 45. Less than degrees.

  As described above, in the flow rate adjusting device 31 of the third embodiment, the mounting portion 37 has a cylindrical arm-side slide portion 37a that can slide on the lever arm 34 and a cylindrical guide side that can slide on the guide member 32. Since the arm-side slide portion 37a and the guide-side slide portion 37b are rotatably connected to each other, the arm-side slide portion 37a slides on the lever arm 34 and simultaneously slides on the arm-side slide. The guide side slide part 37b that can rotate with respect to the part 37a slides on the guide member 32, so that the lever arm 34 can be smoothly rotated to adjust the opening degree.

  Next, the difference between the fourth embodiment and the third embodiment is that, in the third embodiment, the guide member 32 is in the shape of a linear round bar, whereas in the flow rate adjustment device 41 of the fourth embodiment, As shown in FIG. 5, the guide member 42 of the guide mechanism 48 is in the shape of a rod bent in an arc shape. That is, in the fourth embodiment, the guide member 42 extends in a convex curved shape toward the valve body rotation shaft 3a.

  Therefore, also in the flow rate adjusting device 41 of the fourth embodiment, the guide member 42 extends in a convex curved shape toward the valve body rotation shaft 3a as in the second embodiment. As compared with the case where the angle is extended in a straight line, the rate of change in rotation of the lever arm 34 with respect to the rotation of the drive arm 9 becomes smaller as the opening becomes smaller, thereby enabling a finer adjustment of the opening. . Therefore, finer adjustment of the flow rate is possible.

  Next, the difference between the fifth embodiment and the first embodiment is that, in the first embodiment, the drive unit 6 rotates the drive arm 9 to move the link rod 5 forward and backward. In the flow rate adjusting device 51 of the embodiment, as shown in FIG. 6, a hydraulic cylinder is used as the drive unit 56. That is, in the fifth embodiment, the piston rod of the driving device 56 (hydraulic cylinder) is the link rod 55, the proximal end side of the link rod 55 is provided in the hydraulic cylinder, and the distal end of the link rod 55 is the mounting portion. 7 is fixed.

  In the fifth embodiment, the link rod 55 is advanced and retracted by the hydraulic cylinder to move the mounting portion 7 and simultaneously rotate the lever arm 4. Therefore, since the force (power) in the same direction as the moving direction of the mounting portion 7 is transmitted from the link rod 55 which is a piston rod to the mounting portion 7, the power efficiency is good. Further, since the link rod 55 also serves as a piston rod, the number of connecting portions interposed between the driving machine 56 and the mounting portion 7 is reduced, and energy loss at the connecting portion is reduced.

In addition, this invention is not limited to said each embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in each of the above-described embodiments, the flow rate adjusting device using a butterfly valve as the valve body has been described. It can also be applied to inlet vanes and vane control.

  Further, the driving machine is not limited to the electric oil operating device or the hydraulic cylinder, and may be an electric operating device or a pneumatic actuator. Further, in each of the above embodiments, the case where the rotation angle of the lever arm is 0 to 90 degrees has been described. However, the rotation angle is not limited to 0 to 90 degrees, and the use, purpose, and the like of the flow rate adjusting device. It can be set appropriately depending on the situation.

  1, 2, 31, 41, 51 ... Flow rate adjusting device, 2 ... Casing, 3,112 ... Valve body, 3a ... Valve body rotating shaft, 4, 34 ... Lever arm, 4a ... Arm side long hole, 5,55 117 ... Link rod 6,56 ... Driver 7,37 ... Mounting part 8,28,38,48 ... Guide mechanism 12,22,32,42 ... Guide member 12a, 22a ... Guide side slot 37a ... arm side slide part, 37b ... guide side slide part, L ... fluid flow path

Claims (4)

A casing having a fluid flow path formed inside;
A valve body that is provided in the casing and rotates by having a valve body rotation shaft that penetrates the casing;
A lever arm having a base end fixed to the valve body rotation shaft outside the casing and extending in a direction orthogonal to the valve body rotation shaft and rotating together with the valve body rotation shaft;
A link bar having one end attached to the lever arm;
A drive unit that is attached to the other end of the link bar and moves the link bar back and forth;
A guide mechanism for moving the attachment portion of the lever arm and the link rod along the lever arm according to the rotation angle of the lever arm;
When the guide mechanism rotates the lever arm in the direction in which the opening is increased, the guide mechanism is moved to the base end side of the lever arm, and the lever arm is moved in the direction in which the opening is decreased. When rotating, move the mounting portion to the tip side of the lever arm ,
The guide mechanism has a rod-like or long plate-like guide member fixed to the outside of the casing,
The guide member is arranged on the base end side of the lever arm when the lever arm is rotated to a position where the opening degree is maximized on one end side, and the opening degree is minimized on the other end side. It is arranged on the tip side of the lever arm when the lever arm is rotated to a position,
The flow rate adjusting device according to claim 1, wherein the mounting portion connects both the lever arm and the guide member at a position where the lever arm and the guide member overlap with each other, and is mounted so as to be movable along the both . The flow control device according to claim 1 ,
The flow rate adjusting device, wherein the guide member extends in a convex curved shape toward the valve body rotation shaft. In the flow control device according to claim 1 or 2 ,
The guide member has a guide-side long hole formed along the extending direction;
The lever arm has an arm side long hole formed along the extending direction;
The flow rate adjusting device, wherein the attachment portion is a pin member that is inserted into both the guide side long hole and the arm side long hole and is movably attached along the long hole. In the flow control device according to claim 1 or 2 ,
The mounting portion is a cylindrical arm-side slide portion that is slidable on the lever arm through which the lever arm is inserted, and
A cylindrical guide-side slide portion that is inserted through the guide member and is slidable on the guide member;
The flow rate adjusting device, wherein the arm side slide part and the guide side slide part are connected to each other so as to be rotatable.

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