CN112013196A

CN112013196A - Device for reducing piping vibration caused by vortex shedding

Info

Publication number: CN112013196A
Application number: CN202010857023.XA
Authority: CN
Inventors: 邹建荣; 武心壮; 秦洁; 蔡坤; 张玉; 蔡奕霖; 沈小要; 邱健; 施伟
Original assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Current assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2020-12-01

Abstract

The invention discloses a device for reducing piping vibration caused by vortex shedding, which is a drainage tube (5), wherein one end of the drainage tube (5) is arranged on a main pipeline (1) and can guide fluid in the main pipeline (1) to pass through the drainage tube (5); the other end of the drainage tube (5) extends from the branch pipeline (3) to a main pipeline tee joint (4) at the joint of the main pipeline (1) and the branch pipeline (3) and can guide the fluid in the drainage tube (5) to flow into the main pipeline tee joint (4). The design starts from weakening the vortex at the tee joint, inhibits the acoustic resonance phenomenon, reduces the vibration of the piping system, eliminates overlarge stress or fatigue of the pipeline caused by the acoustic resonance, and improves the safety of the piping system.

Description

Device for reducing piping vibration caused by vortex shedding

Technical Field

The invention relates to the technical field of piping system vibration, in particular to the technical field of reducing piping system vibration caused by vortex shedding.

Background

In the occasions of electric power, chemical industry, military industry and the like, the phenomenon of fluid piping vibration is widely existed, and the vibration is related to a piping structure, a fluid working condition and an operation mode. Some of the vibrations can be considered in the design stage, but some vibrations cannot be completely solved in the design stage due to the deviation of manufacturing and installation. There are many means for eliminating the vibration, but the method for solving the vibration problem is limited due to space and other factors. The acoustic resonance is a resonance phenomenon generated by coupling fluid-excited vibration with acoustic frequency, and is mostly generated in a main pipeline with branch pipes, and can be avoided by changing the size and the length of the branch pipes, but the modification of the branch pipes is not easy due to the limitation of tee joint manufacturing or arrangement space. Therefore, the acoustic resonance phenomenon can be inhibited and the piping vibration can be reduced by designing a scheme without changing the size and the arrangement trend of the branch pipes.

The invention aims to provide a design for reducing the vibration of a pipeline system caused by vortex shedding, which starts from weakening the vortex at a tee joint, inhibits the phenomenon of acoustic resonance, reduces the vibration of the pipeline system, eliminates overlarge stress or fatigue of the pipeline caused by the acoustic resonance and improves the safety of the pipeline system.

Disclosure of Invention

The invention aims to provide a device for reducing the vibration of a piping system caused by vortex shedding, which is a drainage tube (5), wherein one end of the drainage tube (5) is arranged on a main pipeline (1) and can guide the fluid in the main pipeline (1) to pass through the drainage tube (5); the other end of the drainage tube (5) extends from the branch pipeline (3) to a main pipeline tee joint (4) at the joint of the main pipeline (1) and the branch pipeline (3) and can guide the fluid in the drainage tube (5) to flow into the main pipeline tee joint (4).

Preferably, the drainage tube (5) is connected with the main pipeline (1) and the branch pipeline (3) by welding.

The design of reducing the piping vibration that the swirl drops and arouses, this design draws forth a fluid inflow branch pipe on the main pipe to flow out from the tee bend of main pipe and branch pipe, this fluid has weakened the swirl that the fluid formed in the main pipe at the tee bend department, and then restraines the swirl fluctuation because the audio frequency coupling is enlargied in the branch pipe, thereby reduces the vibration of piping. The design starts from weakening the vortex at the tee joint, inhibits the acoustic resonance phenomenon, reduces the vibration of the piping system, eliminates overlarge stress or fatigue of the pipeline caused by the acoustic resonance, and improves the safety of the piping system.

Drawings

FIG. 1 is a simplified design for reducing piping vibration caused by vortex shedding;

wherein: 1-main pipeline; 2-a fluid; 3-branch pipeline; 4-main pipe tee; 5-drainage tube

Detailed Description

For a clearer understanding of the present invention, the following description will be made with reference to fig. 1 by taking the operation of avoiding the piping vibration caused by vortex shedding as an example, and the design of the present invention for reducing the piping vibration caused by vortex shedding is further described.

The design for reducing the vibration of the pipe system caused by vortex shedding can be used for vibration occasions caused by fluid vortex shedding acoustic resonance at the tee joint, such as industries of electric power, chemical engineering, military industry and the like, and mainly comprises a drainage tube, a pressurizing piece and a valve. During the system operation, fluid 2 in main pipe 1, when flowing through main pipe tee bend 4, produces the swirl phenomenon of droing, and the frequency that the swirl drops if the audio frequency is the same or is close with in the branch pipeline 3, will produce acoustic resonance, can aggravate the vibration of pipeline, if the same can be close with the structural frequency of piping again of acoustic resonance frequency, can further aggravate the vibration of pipeline. After the drainage tube is added, because a certain pressure difference exists between the inlet position and the outlet position of the fluid flowing drainage tube, part of the fluid 2 flows out from the main pipeline tee joint 4 after entering the branch pipeline 3 through the drainage tube 5, thereby destroying the original vortex shedding phenomenon at the tee joint 4, inhibiting the acoustic resonance phenomenon and reducing the vibration of the piping system.

The flow is led out from the main pipeline in the process and flows into the branch pipe, and flows out from the tee joint of the main pipeline and the branch pipe, the flow breaks the vortex shedding phenomenon formed by the flow at the tee joint in the main pipeline, and further the vortex fluctuation is restrained from being amplified in the branch pipe due to the coupling with the audio frequency, and therefore the vibration of the pipe system is reduced. The design starts from changing the vortex at the tee joint, inhibits the phenomenon of acoustic resonance, reduces the vibration of the piping system, eliminates overlarge stress or fatigue of the pipeline caused by the acoustic resonance, and improves the safety of the piping system.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations. The foregoing examples or embodiments are merely illustrative of the present invention, which may be embodied in other specific forms or in other specific forms without departing from the spirit or essential characteristics thereof. The described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention should be indicated by the appended claims, and any changes that are equivalent to the intent and scope of the claims should be construed to be included therein.

Claims

1. A device for reducing the vibration of a pipe system caused by vortex shedding is characterized in that the device is a drainage pipe (5), one end of the drainage pipe (5) is arranged on a main pipe (1), and fluid in the main pipe (1) can be guided to pass through the drainage pipe (5); the other end of the drainage tube (5) extends from the branch pipeline (3) to a main pipeline tee joint (4) at the joint of the main pipeline (1) and the branch pipeline (3) and can guide the fluid in the drainage tube (5) to flow into the main pipeline tee joint (4).

2. An apparatus for reducing vibration of piping caused by vortex shedding according to claim 1, wherein the draft tube (5) is welded to the main pipe (1) and the branch pipe (3).

3. The diameter of the drainage tube is within 25mm, and the material is consistent with that of the branch tube.