JP2007063939A - Vibration reducing member, power generating plant provided with vibration reducing member, and vibration reducing method using vibration reducing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration reducing member which can reduce vibrations generated on a screen. <P>SOLUTION: The vibration reducing member 100 comprises an abutting part 110 abutting on a vibration part of a screen bar 141 comprising the screen 140, a supporting part 120 one end of which is connected to the abutting part 110, and a holding part 130 for holding the other end of the supporting part 120 at the position higher than an upper end 143 of the screen. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a member that reduces vibration of a screen.

  For example, when water is drawn into a generator from a water intake provided in a river or an irrigation channel, it is necessary to remove wood chips and stones that flow together. A screen is provided upstream of the water intake for this removal. Yes. This screen prevents wood chips and stones from entering the generator.

  However, when the screen provided at the water intake is a screen composed of a plurality of screen bars arranged in parallel at a predetermined interval, the Karman vortex flows downstream of the screen bar by flowing water between the screen bars. In addition, the Karman vortex vibrates in the screen bar. Then, strong vibration due to Karman vortex excitation (resonance) occurs in a portion where the frequency (frequency) of vibration due to the Karman vortex approximates the natural frequency of the screen bar. This strong vibration causes a phenomenon that the screen is broken.

  Damage to the screen due to Karman vortex excitation (resonance) reduces the function of the screen and causes repair or replacement of the damaged screen. Furthermore, when this broken piece enters the generator and the generator breaks down, the cost and work load required for repair and the like increase. Under such circumstances, a member and a method for reducing the vibration of the screen bar due to the Karman vortex excitation are desired.

  In the past, when vibration due to Karman vortex excitation occurred on the screen provided at the intake, etc., it was left in that state and waited for periodic inspections, or the related equipment was stopped and inspected and repaired. . It was not possible to reduce the vibration generated on the screen in the state of continuous water intake, and furthermore, it was not possible to reduce the vibration immediately after detecting the vibration of the screen. These can be said to be the problems of the present invention.

  This invention is made | formed in view of the above subjects, and it aims at providing the member which reduces the vibration which arose on the screen.

  In order to achieve the above object, the inventor has found that it is possible to reduce the vibration by bringing a predetermined member into contact with the vibrating portion where the vibration is generated on the screen. A power generation plant including a reduction member, a vibration reduction member, and a method of reducing vibration using the vibration reduction member have been invented.

  (1) A plurality of screen bars arranged in parallel at a predetermined interval and a screen bar adjacent to each other among the plurality of screen bars arranged in a flow path of liquid flowing in a predetermined direction or an intake port for taking in liquid are connected. A vibration reducing member capable of reducing vibration due to the flow of the liquid generated in the screen having a screen side connecting portion, wherein the liquid in the vibrating portion of the screen bar in which the vibration is generated flows. A vibration comprising: an abutting portion to be abutted; a support portion whose one end is connected to the abutting portion; and a holding portion for holding the other end side of the supporting portion at a position higher than the upper end of the screen. Reduction member.

  The vibration reducing member according to the invention of (1) includes a screen disposed at a liquid inlet, an abutting portion in contact with the vibrating portion of the screen, and a support portion having one end connected to the abutting portion. And a holding member for holding the other end side of the support portion. The screen includes a screen bar arranged substantially in parallel at a predetermined interval and a connecting member that connects screen bars adjacent to each other among the screen bars. The contact portion is in contact with a vibrating portion in which vibration is generated in the screen bar. The position of the contact portion can be adjusted by a support portion having one end connected to the contact portion and a holding member that holds the support portion.

  The vibration reducing member according to the invention of (1) reduces vibration due to Karman vortex excitation generated in a flow path of liquid flowing in a predetermined direction or a screen disposed in an intake port for taking in liquid. The vibration is caused by Kalman excitation (resonance) when the frequency (frequency) of vibration due to Karman vortex generated by the flow of liquid between the screen bar and the natural frequency of the screen bar approximates. Arise. By bringing the abutting portion into contact with a vibrating portion where vibration due to Kalman excitation occurs, vibration due to Kalman excitation caused by the flow of the liquid can be reduced.

  The vibration of the vibration part is reduced by one or more of the effects described below. First, when the contact portion is brought into contact with the vibration portion of the screen bar, the contact portion is coupled to the vibration portion at the contact position by frictional force generated between the contact portion and the vibration portion. It becomes a state close to the state. The contact portion and the vibration portion are integrated. As a result, the mass of the vibration part substantially increases, the length of the vibration part becomes shorter, and the natural frequency in the vibration part changes. Second, the abutment part abuts on the upstream side of the vibration part, so that the flow and flow rate of the liquid in the vicinity of the vibration part change, and the state of the Karman vortex caused by the liquid flow and the vibration caused by the Karman vortex The frequency changes. Third, when the contact portion is in contact with the vibration portion, vibration generated in the vibration portion can be released to another member or the like via the contact portion or the support portion connected to the contact portion. it can. Fourth, when the contact portion is in contact with the vibration portion, a frictional force is generated between the contact portion and the vibration portion, and the vibration is attenuated by this frictional force.

  (2) The vibration reduction member according to (1), wherein the contact portion includes a screen bar having the vibration portion and a first contact member that intersects a screen bar adjacent to the screen bar having the vibration portion.

  The contact portion of the vibration reducing member according to the invention of (2) includes a first contact member that contacts the vibration portion and also contacts a screen bar adjacent to the screen bar having the vibration portion. The first abutting member abuts not only on the screen bar having the vibration part but also on the screen bar adjacent to the screen bar, and suitably reduces vibration. Further, the first abutting member is disposed so as to intersect with the screen bar having the vibrating portion, and is preferably disposed so as to intersect with the screen bar substantially perpendicularly. Further, the first abutting member may abut on one or both of the adjacent screen bars, and may also abut on another screen bar different from the adjacent screen bar.

  (3) The abutting portion is disposed in the longitudinal direction of the screen bar with respect to the first abutting member, and a second abutting member that abuts on the screen bar having the vibrating portion; The vibration reducing member according to (2), further comprising: a connecting member that connects the first contact member and the second contact member.

  The contact portion of the vibration reduction member according to the invention of (3) is a first contact member that contacts the screen bar adjacent to the screen bar having the vibration portion while contacting the vibration portion; A second abutting member disposed in the longitudinal direction of the abutting member and abutting on the screen bar having the vibrating portion.

  The second contact member is in contact with any position of the screen bar having the vibration part. Further, the second abutting member can be brought into contact with an adjacent screen bar in the same manner as the first abutting member. The second abutting member is disposed so as to intersect the screen bar having the vibrating portion, similarly to the first abutting member, and is preferably disposed substantially parallel to the first abutting member.

  The connecting member connects the first contact member and the second contact member. The first abutting member and the second abutting member connected by the connecting member integrally form an abutting portion to reduce vibration more suitably.

  (4) The second abutting member includes a position where the first abutting member abuts on the vibration part and a position where the second abutting member abuts on the screen bar having the vibration part. The vibration reducing member according to (3), wherein the distance between the two is arranged to be longer than an interval between adjacent screen side connecting portions across the vibrating portion.

  The second contact member constituting the contact portion of the vibration reducing member according to the invention of (4) is a position where the first contact member contacts the vibration portion, and the second contact member is the vibration member. It arrange | positions so that the distance between the positions which contact | abut to the screen which has a part may become longer than the space | interval of the adjacent screen side connection member on both sides of a vibration part. As a result, when the first contact member is in contact with the vibrating portion, the second contact portion is in contact with the screen bar at a position beyond the screen side connecting portion sandwiching the vibration portion. In other words, the first abutting member can be brought into contact with the vibrating portion, and the second abutting member can be brought into contact with a portion of the same screen bar that is not the vibrating portion. It is possible to prevent both the first contact member and the second contact member from contacting the same vibration part.

  (5) The vibration according to any one of (1) to (4), further including a restriction portion that engages with at least one of the screen bars to restrict movement in the width direction of the screen bar. Reduction device.

  The vibration reducing member according to the invention of (5) further includes a restricting portion that engages with at least one of the screen bars and restricts movement of the screen bar in the width direction. For example, the restricting portion can be provided in the vicinity of the contact portion so as to protrude toward the screen bar. Moreover, it is preferable that a plurality of restricting portions are provided, and for example, they may be provided in the vicinity of both end portions of the contact portion.

  (6) The restriction portion includes a first recess that is slidably fitted to the vibration portion, and a second recess that is slidably fitted to a screen bar different from the screen bar having the vibration portion. The vibration reducing member according to (6), further comprising: an abutting portion side coupling portion that couples the first concave portion and the second concave portion.

  The restricting portion of the vibration reducing member according to the invention of (6) is a second concave portion that is slidably fitted to a screen bar different from the first concave portion that is slidably fitted to the screen bar having the vibrating portion. A recess. This restricts and positions the contact portion in the width direction of the screen bar, and enables the screen bar to move in the longitudinal direction. Here, the first concave portion and the second concave portion can be made to function as an abutting portion by bringing the first concave portion and the second concave portion into contact with the vibrating portion.

  The restricting portion includes a connecting portion that connects the first recess and the second recess. The connecting portion connects the first concave portion and the second concave portion, so that the connecting portion is formed as an integral member, and vibration is suitably reduced.

  (7) a screen having the liquid intake port, a plurality of screen bars arranged in parallel at a predetermined interval, and a screen side connecting portion that connects the screen bars adjacent to each other among the screen bars; ) To (6), a detecting means for detecting the vibration generated on the screen, and the vibration reducing member when the vibration detected by the detecting means is larger than a predetermined vibration. Control means for instructing the abutment part to abut on the vibration part; drive means for driving the vibration reducing member to abut the abutment part on the vibration part according to an instruction from the control means; A power plant comprising: a turbine turbine that is rotatable by the liquid flowing between the screen bars; and a generator that is coupled to the turbine turbine.

  A power plant according to the invention of (7) includes the vibration reducing member that reduces vibrations of a screen disposed at a liquid inlet, and reduces vibration generated on the screen without stopping the operation of the power plant. To prevent damage. Moreover, the failure | damage of the generator etc. which arise when the fragment | piece of a broken screen part, the piece of wood, the stone, etc. which flow in from the damaged part enter the inside of a generator are prevented.

  (8) A plurality of screen bars arranged in parallel at a predetermined interval, arranged in a flow path of liquid flowing in a predetermined direction or an intake port for taking in liquid, and the screen bars adjacent to each other among the screen bars A method of reducing vibration due to the flow of the liquid generated in a screen having a screen-side connecting portion to be connected, wherein the contact portion in the vibration reducing member according to any one of (1) to (6) A method of reducing vibrations that are brought into contact with a part.

  The method for reducing vibration according to the invention of (8) is characterized in that a contact portion of the vibration reducing member is brought into contact with the vibration portion of the screen. The effect of reducing the above-described vibration can be obtained by bringing the contact portion into contact with the vibration portion.

  According to the vibration reducing member of the present invention, vibration generated in the screen can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective external view showing an embodiment of a vibration reducing member according to the present invention. FIG. 2 is a front view showing an embodiment of the vibration reducing member according to the present invention. 3A is a front view and FIG. 3B is a side view showing a contact portion of the vibration reducing member according to the present invention. FIG. 4A is a front view and FIG. 4B is a side view showing a modification of the vibration reducing member according to the present invention. FIG. 5 is a schematic configuration diagram of a system using the vibration reducing member in the present invention. FIG. 6 is a graph showing a measurement result of vibration generated on the screen. 7 and 8 are cross-sectional views showing an embodiment of the contact portion in the vibration reducing member according to the present invention. FIG. 9 is a conceptual diagram showing an embodiment of a power plant using a vibration reducing member according to the present invention. FIG. 10 is a perspective external view of the vibration reducing member according to the present invention disposed at the initial position with the screen.

  1 and 3, a vibration reducing member 100 according to the present invention includes an abutting portion 110 that abuts on a screen 140, a rod-like support portion 120 that is connected to the abutting portion 110 at one end, and a supporting portion. And a holding unit 130 that holds 120. The holding part 130 has an insertion part 131 through which the support part 120 can be inserted, and the support part 120 is inserted into the insertion part 131 so as to be slidable.

  1 and 10, the contact portion 110 of the vibration reducing member 100 according to the present invention is disposed so as to be in contact with the vibration portion A in which vibration is generated in the screen 140. As shown in FIG. 10, the contact portion 110 disposed above the liquid level of the liquid 150 is disposed at a position where it comes into contact with the vibration portion A as shown in FIG. 1.

  1, 2, and 10, the screen 140 includes a plurality of screen bars 141 arranged substantially in parallel at a predetermined interval, and a plurality of screen-side connecting portions 142 that connect the screen bars 141 adjacent to each other. . For example, a long plate-like member can be used for the screen bar 141. For example, by forming a notch part on the downstream side of the plurality of long plate-like members so as to be aligned substantially in the width direction of the screen 140, and connecting the screen bar 141 by fitting a bar-like member into the notch part. A screen 140 may be formed.

  The screen 140 is disposed on the upstream side of the intake port 160 so as to lean on the upper portion of the intake port 160. Then, the screen 140 removes wood chips, stones and the like contained in the passing liquid 150.

  Examples of the liquid 150 include water flowing in a river and water stored in a dam. As the liquid 150 passes through the screen 140 disposed on the upstream side of the intake port 160, the screen bar 141 is vibrated. Specifically, when the liquid 150 passes through the screen 140, a Karman vortex is generated on the downstream side of the screen bar 141. In a portion where the frequency (frequency) of the Karman vortex approximates the natural frequency of the screen bar 141, strong vibration due to Karman excitation (resonance) occurs. Although the Karman vortex and the vibration due to the Karman vortex are generated in the plurality of screen bars 141, only the portion satisfying the above condition becomes the vibrating portion A. Usually, the Kalman excitation is generated in a portion of the screen bar 141 that can be vibrated between a pair of adjacent screen-side connecting portions 142 and screen-side connecting portions 142.

  1 and 3, the contact portion 110 includes a first contact member 111 and a second contact member 112. The first contact member 111 and the second contact member 112 are connected by a connecting member 113 and a connecting member 114. The second contact member 112 is disposed substantially parallel to the longitudinal direction of the screen bar 141 with respect to the first contact member 111. The first contact member 111 and the second contact member 112 are connected by a connecting member 113 and a connecting member 114 and used as an integral member.

  In FIGS. 1 and 2, the first contact member 111 and the second contact member 112 are in contact with a plurality of screen bars 141. The first abutting member 111 and the second abutting member 112 are at substantially the same interval as the interval between the pair of screen side connecting portions 142 and screen side connecting portions 142 that are adjacent to each other so as to sandwich the vibration portion A. Has been placed.

  Since the first abutting member 111 and the second abutting member 112 are arranged at the above-mentioned distance, the same portion of the screen bar 141 sandwiched between the screen-side connecting portion 142 and the screen-side connecting portion 142 is used. Not abutted. That is, the first contact member 111 and the second contact member 112 are not in contact with the same vibration part A sandwiched between the same connection parts. Here, by making the lengths of the first contact member 111 and the second contact member 112 an integral multiple of the interval in the width direction of the screen bar 141, a large number of screen bars 141 are efficiently contacted. be able to.

  The position where the abutting part 110 abuts on the vibration part A is not particularly limited, but is preferably a vibration abdomen in the vibration part A. For example, a substantially central position between the screen side connecting part 142 and the screen side connecting part 142 that are adjacent to each other with the vibration part A interposed therebetween can be exemplified.

  The vibration of the vibration part A is reduced by one or more of the effects described below.

  First, when the contact portion 110 is in contact with the vibrating portion A of the screen bar 141, the contact portion 110 is moved to its contact position due to a frictional force generated between the contact portion 110 and the vibrating portion A. Thus, the state is close to the state connected to the vibration part A. The contact portion 110 and the vibration portion A are integrated. Thereby, while the mass of the vibration part A increases substantially, the length of the vibration part A becomes short, and the natural frequency in the vibration part A changes.

  Second, the abutment portion 110 abuts on the upstream side of the vibration portion A, so that the flow and flow rate of the liquid 150 in the vicinity of the vibration portion A change, and the state of the Karman vortex and the Kalman produced by the flow of the liquid 150 change. The frequency of vibration generated by the vortex changes.

  Third, when the contact portion 110 is in contact with the vibration portion A, the vibration generated in the vibration portion A is transferred to another contact portion 110 or another support portion 120 connected to the contact portion 110. It can escape to a member etc.

  Fourth, when the contact part 110 is in contact with the vibration part A, a frictional force is generated between the contact part 110 and the vibration part A, and the vibration is attenuated by this frictional force. This frictional force varies depending on the flow velocity of the liquid 150, the inclination of the screen 140, and the shape and weight of the contact portion 110. A larger frictional force is preferable in terms of causing the abutment part 110 and the vibration part A to be integrated and damping vibration due to the frictional force.

  The contact part 110 can also change the flow of the liquid in the vicinity of the vibration part A by arranging a flat member so that its wide surface is perpendicular to the flow of the liquid.

  The total length of the contact portion 110 and the length of the support portion 120 having one end connected to the contact portion 110 is formed longer than the length of the screen 140 in the height direction. Accordingly, the holding unit 130 can hold the side of the support unit 120 that is not connected to the contact unit 110 at a position higher than the upper end 143 of the screen 140.

  The support part 120 can illustrate string members, such as a cylindrical or square rod member and a wire, for example. When a bar member is used, the embodiment is as shown in FIG. When a string member is used, in order to adjust the position of the contact part 110, the string member as a support part is unwound and adjusted by a reel (not shown) as a holding part.

  The support part 120 may use a member that can be deformed in the lateral direction, such as a rod-like member that bends like a bow. For example, the support portion 120 that is a rod-like member that bends like a bow is bent toward the screen 140 by the fluid pressure of the liquid 150, and the bent portion enters between the screen bar 141 and the screen bar 141. Due to the portion that has entered between the screen bar 141 and the screen bar 141, the support portion 120, which is a bar-like member that bends like a bow, is restricted from moving in the width direction of the screen 140.

  The support part 120 is configured by a member capable of conducting vibration transmitted from the connected contact part 110. Thereby, the vibration of the vibration part A can be released to another member via the support part 120. Further, the vibration of the vibration part A can be detected via the support part 120.

  Since the contact part 110 is disposed on the upstream side of the screen 140, the contact part 110 is pressed and disposed on the screen 140 by the fluid flow pressure. For example, the contact portion 110 may have a shape that easily receives fluid pressure.

  In FIG. 7, the restricting portion 710 and the restricting portion 720 are provided at both ends of the contact portion 110 so as to protrude toward the screen 140. The restricting portion 710 and the restricting portion 720 engage with the screen bars 141 and 141, respectively, and restrict the movement of the contact portion 110 in the width direction of the screen bar 141. One or a plurality of restricting portions may be provided, but when the restricting portion 710 and the restricting portion 720 are provided at both ends of the abutting portion 110 as shown in FIG. The part 110 can be suitably positioned.

  In FIG. 8, the contact portion 110 is slidably fitted to a screen bar different from the screen bar having the vibration portion A and the first recess 810 slidably fitted to the vibration portion A. The recess 820 is provided. The first concave portion 810 and the second concave portion 820 are connected by the contact portion side connecting portion 830.

  The first recess 810 is fitted to the screen bar 141 to position the contact portion 110. The first recess 810 is slidably fitted to the screen bar 141 and moved in the longitudinal direction of the screen bar 141 along the screen bar 141. For example, the first recess 810 can be fitted to the screen bar 141 in the vicinity of the upper end 143 of the screen 140, and can be slid to a position where the contact part 110 contacts the vibration part A.

  The second recess 820 is fitted to the screen bar 141 adjacent to the screen bar 141 in which the first recess 810 is fitted. Similarly to the first recess 810, the second recess 820 is slidably fitted to the screen bar 141 and can be moved along the screen bar 141 in the longitudinal direction of the screen bar.

  The contact portion side connecting portion 830 connects the first concave portion 810 and the second concave portion 820. Thereby, since the 1st recessed part 810 and the 2nd recessed part 820 become integral, the contact part 110 grade | etc., Can be positioned appropriately.

  Furthermore, the first recess 810 or the second recess 820 can be used as the contact portion 110. By bringing the first concave portion 810 or the second concave portion 820 into contact with the vibration portion A, vibration generated in the screen 140 can be reduced.

  In FIG. 4, the vibration reducing member which is a modification of the present invention includes an abutting portion 410, a support portion 420 connected at one end side, and a holding portion (not shown). The contact portion 410 includes a contact member 411 and a claw portion 430 that protrudes to the side facing the side that contacts the screen bar 141.

  5, the system using the vibration reducing member 100 according to the present invention includes a vibration reducing member 100 arranged on the upstream side of the screen 140, a detecting means 520 for detecting vibration of the screen 140 and the slab 510, and a contact portion. A control unit 540 that issues an instruction to bring 110 into contact with the vibration part A, and a drive unit 550 that drives the vibration reduction member 100 in accordance with an instruction from the control unit.

  For example, when the vibration detected by the detection unit 520 is larger than a predetermined vibration, the control unit 540 instructs the vibration reduction member 100 to bring the contact portion 110 into contact with the vibration portion A. The predetermined vibration may be, for example, more than twice the normal vibration.

  For example, the detection unit 520 may use a vibrometer that detects vibration by detecting acceleration. Further, the vibration detected by the detecting means 520 may be monitored by the memory coder 530. Furthermore, the detection unit 520 may use, for example, a detection device using a sound wave that can detect the position of the vibration part A. In this case, it is possible to automatically arrange the contact part 110 in the vibration part A by detecting the vibration generated in the screen 140.

  The system using the vibration reducing member 100 includes a plurality of screen bars 141 arranged in parallel at a predetermined interval and disposed in a flow path of the liquid 150 flowing in a predetermined direction or an intake port 160 for taking in the liquid 150. The vibration due to the flow of the liquid 150 generated on the screen 140 having the screen-side connecting portion 142 that connects the screen bars 141 adjacent to each other among the bars 141 is detected and automatically reduced.

  9 and 5, the power plant 900 according to the present invention has vibrations of the liquid intake 160, the screen 140, the vibration reducing member 100 disposed on the upstream side of the screen 140, the screen 140 and the slab 510. Between the detection means 520 for detecting, the control means 540 for giving an instruction to bring the contact part 110 into contact with the vibration part A, the drive means 550 for driving the vibration reducing member 100 according to the instruction from the control means, and the screen bar A turbine turbine 910 that can be rotated by the liquid flowing out of the turbine, and a generator 920 coupled to the turbine turbine 910. The screen 140, the detection unit 520, and the control unit 540 are as described above.

  The liquid 150 passes through the screen 140 disposed on the upstream side of the intake port 160, is guided to the turbine turbine 910 through the liquid guide pipe 930, and rotates the turbine turbine 910. When the turbine turbine 910 is rotated, power is generated by the generator 920 connected thereto. The liquid 150 is discharged out of the power plant from the liquid discharge port 940 after rotating the turbine turbine 910.

  Since the power plant 900 includes the vibration reducing member 100 that reduces the vibration of the screen 140 disposed on the upstream side of the liquid intake port 160, vibration generated in the screen 140 can be generated without stopping the operation of the power plant 900. Can be reduced. As a result, the screen 140 can be prevented from being damaged, and the adverse effect on the turbine turbine 910 and the generator 920 caused by fragments of the damaged part of the screen 140 or pieces of wood or stones flowing from the damaged part can be prevented. be able to.

  In FIG. 6, a vibration meter (for example, VM-61 (Lion), which is a detecting means 520 for detecting vibrations in the upper end 143 of the screen bar 141 where the vibration is generated in the screen 140 and the slab 510 adjacent to the screen 140. It is a graph of the result of measuring vibration by a company))). The horizontal axis indicates elapsed time (the horizontal axis of this graph indicates 5 seconds at 8000 scale), and the vertical axis indicates amplitude. 6A is a graph when the contact portion 110 of the vibration reducing member 100 according to the present invention is in contact with the vibration portion A, and FIG. 6B is a graph when vibration is generated on the screen 140. It is. From the graph of FIG. 6, it was found that the vibration generated on the screen was suitably reduced by the vibration reducing member 100 according to the present invention.

  Table 1 below shows the maximum value (acceleration) of vibrations measured in the same manner.

  From the measurement results shown in FIG. 6 and Table 1, the vibration generated in the vibration part A is reduced by bringing the contact part 110 of the vibration reduction member 100 into contact with the vibration part A in which vibration is generated in the screen bar 141. It has been found that the vibration of the screen 140 is reduced. It has been found that the vibration generated on the screen 140 can be reduced by bringing the contact portion 110 of the vibration reducing member 100 according to the present invention into contact with the vibration portion A.

It is a perspective appearance figure showing one embodiment of a vibration reducing member by the present invention. It is a front view which shows one Embodiment of the vibration reduction member by this invention. It is (a) front view and (b) side view which show the contact part of the vibration reduction member by this invention. It is the (a) front view and (b) side view which show the modification of the vibration reduction member by this invention. It is a schematic block diagram of the system using the vibration reduction member in this invention. It is a graph which shows the measurement result of the vibration which arose on the screen. It is sectional drawing which shows one Embodiment of the contact part in the vibration reduction member by this invention. It is sectional drawing which shows one Embodiment of the contact part in the vibration reduction member by this invention. It is a conceptual diagram which shows one Embodiment of the power plant using the vibration reduction member by this invention. 1 is a perspective external view of a vibration reducing member according to the present invention disposed at a screen and an initial position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Vibration reduction member 110 Contact part 120 Support part 130 Holding part 140 Screen 141 Screen bar 142 Screen side connection part 150 Liquid 160 Inlet

Claims (8)

A screen side connecting a plurality of screen bars arranged in parallel at a predetermined interval and a screen bar adjacent to each other among the plurality of screen bars arranged in a flow path of liquid flowing in a predetermined direction or an intake port for taking in liquid A vibration reducing member capable of reducing vibration due to the flow of the liquid generated in a screen having a connecting portion,
An abutting portion that is in contact with the liquid flowing side of the vibrating portion in which the vibration occurs in the screen bar;
A support portion whose one end is coupled to the contact portion;
A holding part for holding the other end side of the support part at a position higher than the upper end of the screen;
A vibration reducing member comprising:   2. The vibration reducing member according to claim 1, wherein the contact portion includes a screen bar having the vibration portion and a first contact member that intersects a screen bar adjacent to the screen bar having the vibration portion.   The abutting portion is disposed in the longitudinal direction of the screen bar with respect to the first abutting member, and a second abutting member that abuts on the screen bar having the vibrating portion, and the first abutting member. The vibration reducing member according to claim 2, further comprising a contact member and a connecting member that connects the second contact member.   The second abutting member is a distance between a position where the first abutting member abuts on the vibrating portion and a position where the second abutting member abuts on the screen bar having the vibrating portion. The vibration reducing member according to claim 3, wherein the vibration reducing member is disposed so as to be longer than an interval between adjacent screen side connecting portions with the vibrating portion interposed therebetween.   5. The vibration reduction device according to claim 1, further comprising a restriction portion that engages with at least one of the screen bars to restrict movement in the width direction of the screen bar.   The restricting portion includes a first recess that is slidably fitted to the vibrating portion, a second recess that is slidably fitted to a screen bar different from the screen bar having the vibrating portion, and the first The vibration reducing member according to claim 5, further comprising: a first concave portion and a contact portion side connecting portion that connects the second concave portion. An inlet for the liquid;
A screen having a plurality of screen bars arranged in parallel at a predetermined interval and a screen-side connecting portion that connects the screen bars adjacent to each other among the screen bars;
The vibration reducing member according to any one of claims 1 to 6,
Detecting means for detecting vibration generated in the screen;
Control means for instructing the abutting portion of the vibration reducing member to abut against the vibrating portion when the vibration detected by the detecting means is greater than a predetermined vibration;
Driving means for driving the vibration reducing member to bring the abutting portion into contact with the vibrating portion according to an instruction from the control means;
A turbine turbine rotatable by the liquid flowing between the screen bars;
And a generator coupled to the turbine turbine. A screen connecting a plurality of screen bars arranged in parallel at a predetermined interval and a plurality of screen bars arranged in parallel at predetermined intervals, and a flow path of liquid flowing in a predetermined direction or a liquid intake port. A method of reducing vibration caused by the flow of the liquid generated in a screen having a side connection part,
The method of reducing the vibration which makes the said contact part contact in the said vibration part in the vibration reduction member in any one of Claim 1 to 6.

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