Dynamic vibration absorber for pipelines

Abstract

The present invention discloses a dynamic vibration absorbing device suitable for pipelines, comprising a first vibration damping box and a second vibration damping box, wherein the first vibration damping box and the second vibration damping box cooperate to be clamped on the pipeline, wherein the first vibration damping box and the second vibration damping box each comprise a fixed plate and a vibration damping mechanism, wherein one end of the vibration damping mechanism is fixed on the fixed plate, and the other end of the vibration damping mechanism is free to move, and an adjustment block is arranged on the vibration damping mechanism, and the adjustment block is used to change the vibration frequency of the vibration damping mechanism. The dynamic vibration absorbing device suitable for pipelines of the present invention changes the stiffness of the adjustment beam by adjusting the position of the adjustment block on the vibration damping mechanism, thereby changing the vibration frequency of the vibration damping mechanism, adjusting the performance of the vibration damper, utilizing the principle of dynamic vibration absorption to achieve a better vibration damping effect, and realizing effective vibration damping of the pipeline by clamping the two vibration damping boxes.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant pipeline protection and vibration reduction, and in particular to a multi-directionally tunable dynamic vibration absorption device for nuclear power plant pipelines. Background Art

[0002] Nuclear power plants have a large number of pipelines with complex layouts. During the operation of the unit, weld cracks or fractures caused by the alternating stress behavior of the pipeline system often occur. Once pipeline failure occurs, the unit may be forced to shut down at the least, or even cause a major accident with casualties.

[0003] According to on-site experience feedback, the main failure form of nuclear power plant pipelines is fatigue cracking at the welds. Usually, methods such as improving welding processes and adding support frames are used to extend the life of the pipelines. In existing research, patents such as ZL201810151127.1, CN201720980824.9, and CN201720595097.4 provide several pipeline support and hanger solutions to reduce the risk of pipeline vibration fatigue; CN201620294011.X provides a pipeline weld protection device for reinforcing weak welds. Although the above schemes can protect pipeline welds from a technical level, there are problems such as high deployment cost, poor maintainability, and poor flexibility, and cannot meet the needs of pipeline weld protection under complex working conditions. Therefore, it is urgent to develop a nuclear power plant pipeline vibration absorption device with a simple structure and convenient adjustment to alleviate the risk of nuclear power plant pipeline vibration fatigue failure. Summary of the invention

[0004] In view of this, in order to overcome the defects of the prior art and achieve the above-mentioned purpose, the purpose of the present invention is to provide a dynamic vibration absorption device suitable for pipelines, which can effectively reduce the vibration of the pipeline through the principle of dynamic vibration absorption.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A dynamic vibration absorbing device suitable for a pipeline comprises a first vibration damping box and a second vibration damping box, wherein the first vibration damping box and the second vibration damping box cooperate to be clamped on the pipeline, wherein the first vibration damping box and the second vibration damping box each comprise a fixed plate and a vibration damping mechanism, wherein one end of the vibration damping mechanism is fixed to the fixed plate, and the other end of the vibration damping mechanism is free to move, and an adjustment block is arranged on the vibration damping mechanism, and the adjustment block is used to change the vibration frequency of the vibration damping mechanism.

[0007] According to some preferred implementation aspects of the present invention, the vibration reduction mechanism includes a fixed block, an adjustment beam and a particle box, the fixed block and the particle box are respectively located at the two ends of the adjustment beam, the fixed block is fixed to the fixed plate, and the adjustment block is arranged on the adjustment beam. That is, one end of the adjustment beam is fixed as a fixed point, the other end is free to move, and the corresponding position of the adjustment block is another fixed point. By adjusting the position of the adjustment block on the adjustment beam, the distance between the two fixed points on the adjustment beam is adjusted, and the effective stiffness of the adjustment beam is adjusted, thereby adjusting the vibration frequency of the vibration reduction mechanism.

[0008] According to some preferred implementation aspects of the present invention, an adjustment mechanism is included, the adjustment mechanism includes a motor, a slider and a screw rod arranged outside the vibration damping box, the slider is sleeved on the screw rod, the motor is used to drive the screw rod to rotate, and the slider is fixedly connected to the adjustment block. The adjustment mechanism is used to adjust the position of the adjustment block on the adjustment beam. The motor drives the screw rod to rotate, drives the slider to move, and then drives the adjustment block to move, so as to adjust the position of the adjustment block.

[0009] According to some preferred implementation aspects of the present invention, the first vibration damping box and the second vibration damping box both include an arc-shaped portion, a side plate, and a top plate, the arc-shaped portion is used to fit the pipeline, and the adjustment mechanism is disposed outside the side plate and the top plate. The arc-shaped portions of the first vibration damping box and the second vibration damping box are combined and sleeved on the pipeline.

[0010] According to some preferred implementation aspects of the present invention, a connecting rod is provided between the slider and the adjusting block, and a sliding groove for the connecting rod to penetrate and move is provided on the side plate and the top plate, and the sliding groove penetrates the thickness direction of the side plate or the top plate, and the sliding groove extends along the extension direction of the corresponding screw rod. The connecting rod is provided so that the slider and the adjusting block move synchronously.

[0011] According to some preferred implementation aspects of the present invention, the fixed plate includes a vertical plate and a horizontal plate, and the vibration reduction mechanism is arranged between the vertical plate and the side plate and between the horizontal plate and the top plate. A vibration reduction mechanism and an adjustment mechanism arranged in the vertical direction are arranged between the side plate and the vertical plate, and a vibration reduction mechanism and an adjustment mechanism arranged in the horizontal direction are arranged between the horizontal plate and the top plate. Since two side plates and two vertical plates are arranged correspondingly, in some embodiments of the present invention, three vibration reduction mechanisms and adjustment mechanisms are arranged in a vibration reduction box to achieve multi-directional tunability of the vibration frequency. By adjusting the three vibration reduction mechanisms, it can achieve a better vibration reduction effect.

[0012] According to some preferred implementation aspects of the present invention, the fixing block is a U-shaped block, one side wall of the U-shaped block is fixedly connected to the vertical plate or the horizontal plate, and the other side wall of the U-shaped block is fixedly connected to the adjusting beam. The fixing block is set to be U-shaped, which has two opposite sides to achieve the functions of being fixed to the fixing plate and fixedly connected to the adjusting beam. The U-shaped setting can make the adjusting beam swing better to reduce vibration.

[0013] According to some preferred implementation aspects of the present invention, a control mechanism and a vibration monitoring mechanism are included, wherein the vibration monitoring mechanism includes an acceleration sensor, and the control mechanism receives data from the acceleration sensor and adjusts the vibration frequency of the vibration reduction mechanism through the adjustment mechanism. The vibration frequency of the pipeline and the vibration reduction box is monitored by the acceleration sensor and fed back to the control mechanism, and the control mechanism controls the rotation of the lead screw through the motor according to the monitoring result of the vibration frequency, and adjusts the position of the slider and the adjustment block.

[0014] According to some preferred implementation aspects of the present invention, the arc-shaped portions of the first vibration damping box and the second vibration damping box are symmetrically fitted on the pipe; and a rubber block fitting with the arc-shaped portion is disposed inside the arc-shaped portion.

[0015] According to some preferred implementation aspects of the present invention, the particle box is filled with vibration-damping particles, such as iron particles, tungsten particles, ceramsite particles, etc.

[0016] Due to the adoption of the above technical scheme, compared with the prior art, the advantages of the present invention are as follows: the dynamic vibration absorption device suitable for pipelines of the present invention changes the stiffness of the adjustment beam by adjusting the position of the adjustment block on the vibration reduction mechanism, realizes the change of the vibration frequency of the vibration reduction mechanism, adjusts the performance of the vibration absorber, utilizes the principle of dynamic vibration absorption, achieves better vibration reduction effect, and realizes effective vibration reduction of the pipeline by clamping two vibration reduction boxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a three-dimensional diagram of a dynamic vibration absorbing device applicable to a pipeline according to an embodiment of the present invention;

[0019] Figure 2 A three-dimensional diagram of a first vibration-damping box in a dynamic vibration-absorbing device for a pipeline according to an embodiment of the present invention;

[0020] Among them: a first vibration damping box-1, a bolt-2, a second vibration damping box-3, a pipeline-4, an adjustment mechanism-5, a motor-6, a slider-7, an adjustment block-8, an adjustment beam-9, a fixing block-10, a rubber block-11, a control mechanism-12, an acceleration sensor-13, a sliding groove-14, a particle box-15, and an arc-shaped portion-16. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] See attached Figure 1-2 The dynamic vibration absorbing device for the pipeline 4 of this embodiment includes a first vibration damping box 1 and a second vibration damping box 3, which are clamped on the pipeline 4 in cooperation, and each of the first vibration damping box 1 and the second vibration damping box 3 includes a fixing plate, a vibration damping mechanism, an adjustment mechanism 5, a control mechanism 12 and a vibration monitoring mechanism. The structures of the first vibration damping box 1 and the second vibration damping box 3 are basically the same, and the first vibration damping box 1 and the second vibration damping box 3 are fixedly connected by an anti-loosening bolt 2, which is sleeved on the weld structure of the pipeline 4. The vibration monitoring mechanism in this embodiment is installed in the vibration damping box on the plane corresponding to the bolt 2.

[0023] The first vibration damping box 1 and the second vibration damping box 3 both include an arc-shaped portion 16, a side plate, and a top plate. The arc-shaped portion 16 is used to fit with the pipe 4, and the adjustment mechanism 5 is arranged outside the side plate and the top plate. The arc-shaped portions 16 of the first vibration damping box 1 and the second vibration damping box 3 are symmetrically fitted on the pipe 4; a rubber block 11 fitting with the arc-shaped portion 16 is arranged inside the arc-shaped portion 16. The rubber block 11 installed in the arc-shaped portion 16 can better protect the weld.

[0024] The vibration reduction mechanism includes a fixed block 10, an adjustment beam 9 and a particle box 15. The fixed block 10 and the particle box 15 are respectively located at the two ends of the adjustment beam 9. The fixed block 10 is fixed on the fixed plate, and the adjustment block 8 is arranged on the adjustment beam 9. That is, one end of the adjustment beam 9 is fixed as a fixed point, and the other end is free to move, and the corresponding position of the adjustment block 8 is another fixed point. By adjusting the position of the adjustment block 8 on the adjustment beam 9, the distance between the two fixed points on the adjustment beam 9 is adjusted, and the effective stiffness of the adjustment beam 9 is adjusted, thereby adjusting the vibration frequency of the vibration reduction mechanism. The particle box 15 is filled with vibration reduction particles such as iron particles, tungsten particles, and ceramsite.

[0025] The adjustment mechanism 5 includes a motor 6, a slider 7 and a micro screw arranged outside the vibration damping box. The slider 7 is sleeved on the screw. The motor 6 is used to drive the screw to rotate. The slider 7 is fixedly connected to the adjustment block 8. The adjustment mechanism 5 is used to adjust the position of the adjustment block 8 on the adjustment beam 9. The motor 6 drives the screw to rotate, drives the slider 7 to move, and then drives the adjustment block 8 to move, so as to adjust the position of the adjustment block 8. A connecting rod is arranged between the slider 7 and the adjustment block 8. The side plate and the top plate are provided with a sliding groove 14 for the connecting rod to pass through and move. The sliding groove 14 passes through the thickness direction of the side plate or the top plate, and the sliding groove 14 extends along the extension direction of the corresponding screw. The connecting rod is arranged so that the slider 7 and the adjustment block 8 move synchronously.

[0026] The fixed plate includes a vertical plate and a horizontal plate, and a vibration reduction mechanism is arranged between the vertical plate and the side plate and between the horizontal plate and the top plate. A vibration reduction mechanism and an adjustment mechanism 5 arranged in the vertical direction are arranged between the side plate and the vertical plate, and a vibration reduction mechanism and an adjustment mechanism 5 arranged in the horizontal direction are arranged between the horizontal plate and the top plate. Since two side plates and two vertical plates are arranged correspondingly, in this embodiment, three vibration reduction mechanisms and adjustment mechanisms 5 are arranged in one vibration reduction box to achieve multi-directional tunability of the vibration frequency. By adjusting the three vibration reduction mechanisms, it can achieve a better vibration reduction effect.

[0027] The fixing block 10 in this embodiment is a U-shaped block, one side wall of the U-shaped block is fixedly connected to the vertical plate or the horizontal plate by welding, and the upper part of the other side wall of the U-shaped block is fixedly connected to the adjusting beam 9 by welding. The fixing block 10 is set to be U-shaped, and it has two opposite sides to achieve the functions of being fixed on the fixing plate and fixedly connected to the adjusting beam 9. The U-shaped setting can make the adjusting beam 9 swing better to reduce vibration.

[0028] The vibration monitoring mechanism includes an acceleration sensor 13. The control mechanism 12 receives data from the acceleration sensor 13 and adjusts the vibration frequency of the vibration reduction mechanism through the adjustment mechanism 5. The acceleration sensor 13 and the motor 6 are connected to the control mechanism 12 by signal. The vibration frequency of the pipeline 4 and the vibration reduction box is monitored by the acceleration sensor 13 and fed back to the control mechanism 12. The control mechanism 12 controls the rotation of the screw rod through the motor 6 according to the monitoring result of the vibration frequency, and adjusts the position of the slider 7 and the adjustment block 8.

[0029] The present invention adopts the above-mentioned technical solution, which, on the one hand, saves the installation cost and time of the vibration reduction device, and for nuclear island applications, will also greatly reduce the exposure dose to personnel caused by installation and maintenance; on the other hand, such a vibration reduction structure design can reduce the resonance of the pipeline in multiple directions, and its parameters can be conveniently adjusted according to the complex working conditions on site to achieve the best weld protection effect.

[0030] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A dynamic vibration absorbing device suitable for a pipeline, characterized in that: It comprises a first vibration damping box and a second vibration damping box, the first vibration damping box and the second vibration damping box cooperate to be clamped on the pipeline, the first vibration damping box and the second vibration damping box each comprise a fixing plate and a vibration damping mechanism, one end of the vibration damping mechanism is fixed on the fixing plate, the other end of the vibration damping mechanism is free to move, and an adjustment block is arranged on the vibration damping mechanism, the adjustment block is used to change the vibration frequency of the vibration damping mechanism; The vibration reduction mechanism comprises a fixed block, an adjustment beam and a particle box, wherein the fixed block and the particle box are respectively located at two ends of the adjustment beam, the fixed block is fixed to the fixed plate, and the adjustment block is arranged on the adjustment beam; the particle box is filled with vibration reduction particles; It includes an adjustment mechanism, which includes a motor, a slider and a screw rod arranged outside the first vibration damping box and the second vibration damping box, the slider is sleeved on the screw rod, the motor is used to drive the screw rod to rotate, and the slider is fixedly connected to the adjustment block; It includes a control mechanism and a vibration monitoring mechanism, wherein the vibration monitoring mechanism includes an acceleration sensor, the control mechanism receives data from the acceleration sensor and adjusts the vibration frequency of the vibration reduction mechanism through the adjustment mechanism; the vibration frequency of the pipeline and the vibration reduction box is monitored through the acceleration sensor and fed back to the control mechanism, and the control mechanism controls the rotation of the lead screw through a motor according to the monitoring result of the vibration frequency, and adjusts the position of the slider and the adjustment block.

2. The dynamic vibration absorbing device suitable for pipelines according to claim 1, characterized in that: The first vibration damping box and the second vibration damping box both include an arc-shaped portion, a side plate, and a top plate. The arc-shaped portion is used to fit with the pipeline, and the adjustment mechanism is disposed outside the side plate and the top plate.

3. The dynamic vibration absorbing device suitable for pipelines according to claim 2, characterized in that: A connecting rod is arranged between the sliding block and the adjusting block, and a sliding groove for the connecting rod to pass through and move is opened on the side plate and the top plate. The sliding groove passes through the thickness direction of the side plate or the top plate, and the sliding groove extends along the extension direction of the corresponding screw rod.

4. The dynamic vibration absorbing device suitable for pipelines according to claim 2, characterized in that: The fixing plate comprises a vertical plate and a horizontal plate, and the vibration reduction mechanism is arranged between the vertical plate and the side plate and between the horizontal plate and the top plate.

5. The dynamic vibration absorbing device suitable for pipelines according to claim 4, characterized in that: The fixed block is a U-shaped block, one side wall of the U-shaped block is fixedly connected to the vertical plate or the horizontal plate, and the other side wall of the U-shaped block is fixedly connected to the adjusting beam.

6. The dynamic vibration absorbing device suitable for pipelines according to claim 2, characterized in that: The arc-shaped parts of the first vibration-damping box and the second vibration-damping box are symmetrically fitted on the pipe; and a rubber block fitted with the arc-shaped part is arranged inside the arc-shaped part.

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