Variable stiffness coupling damping vibration reduction device for a vibrating pipeline

Abstract

The application discloses a variable stiffness coupling damping vibration reduction device for a vibrating pipeline, which comprises detachable damping vibration reduction modules connected in series, viscous damping modules are arranged at both ends of each detachable damping vibration reduction module, a particle damping module is fixed between the two viscous damping modules, the viscous damping module and the particle damping module are separated by a steel plate, viscous dampers are arranged in each viscous damping module, a connecting interface is fixed on one side of each viscous damper, the other side of the connecting interface extends out of the detachable damping vibration reduction module, and the connecting mode of adjacent detachable damping vibration reduction modules is that the connecting interface at one end of one detachable damping vibration reduction module is connected with the connecting interface at the other end of another detachable damping vibration reduction module. The application solves the problem of unsatisfactory pipeline damping effect in the prior art, reduces the vibration and noise of the pipeline in industrial production, and creates a system pipeline with high stable operation.

Description

Technical Field

[0001] This invention belongs to the field of vibration reduction technology for industrial vibrating pipeline systems, and relates to a variable stiffness coupled damping vibration reduction device for vibrating pipelines. Background Technology

[0002] With the improvement of my country's industrial production technology, the application of large pumps in the industrial field will increase. Taking domestic oil and gas development as an example: as the extraction time increases, the energy of the oil layer itself will be continuously consumed, causing the oil layer pressure to drop continuously, a large amount of underground crude oil to degas, an increase in viscosity, a significant reduction in oil well production, and even shutdown, resulting in a large amount of dead oil remaining underground that cannot be extracted. In order to compensate for the underground deficit caused by crude oil extraction, maintain or increase oil layer pressure, achieve high and stable oil production, and obtain a high recovery rate, water injection must be carried out in the oil field. The measure of injecting water into the oil layer through injection wells using the ultra-high pressure generated by the high-pressure water injection pump during operation to supplement and maintain the oil layer pressure is called water injection. The high-pressure water injection pump used for water injection will cause vibration of the water injection pump manifold pipeline.

[0003] Taking the vibration of the water inlet pipe of an oilfield plunger pump as an example, the amplitudes of both the vertical diameter and axial vibrations are significantly smaller than those of the horizontal radial vibration, and the axial impact characteristics are more pronounced, with the frequency components distributed in the low-frequency range. Converting these values ​​to the velocity range, the horizontal radial vibration velocity is above 30 mm / s. The specific conclusions obtained from the tests are summarized as follows: the vibration of the plunger pump water injection network is mainly generated by the vibration of the plunger pump assembly and the interaction between the liquid and the pipeline. Under the combined effect of these excitations, the frequency domain composition of the network vibration is very complex.

[0004] Solving the vibration problem of the supporting pipeline system caused by the operation of large pumps is particularly crucial. Pipeline vibration can generally be low-frequency (high amplitude) or high-frequency (low amplitude). Viscous dampers used in vibration damping modules can effectively suppress low-frequency (high amplitude) vibrations, but their effect on high-frequency vibration caused by fluid excitation is poor. Particle damping modules are very effective for high-frequency vibrations, but they cannot meet the large-amplitude vibration reduction requirements of pipelines for low-frequency, small-amplitude vibrations. Summary of the Invention

[0005] The purpose of this invention is to provide a variable stiffness coupled damping vibration reduction device for vibrating pipelines, which reduces the vibration and noise of pipelines in industrial production and achieves highly stable operation of the system pipeline.

[0006] The technical solution adopted in this invention is a variable stiffness coupled damping vibration reduction device for vibrating pipelines, comprising several series-connected detachable damping vibration reduction modules. Each detachable damping vibration reduction module has viscous damping modules at both ends, and a particle damping module is fixed between two viscous damping modules. The viscous damping modules and the particle damping modules are separated by a steel plate. Each viscous damping module is equipped with a viscous damper. Each viscous damper has a connection interface fixed on one side, and a detachable damping vibration reduction module extends out from the other side of the connection interface. The connection method of adjacent detachable damping vibration reduction modules is as follows: the connection interface at one end of one detachable damping vibration reduction module is connected to the connection interface at the other end of another detachable damping vibration reduction module. A U-shaped pipe clamp is fixed on one side of each detachable damping vibration reduction module.

[0007] The invention is further characterized by:

[0008] The particle damping module includes a particle damping module cavity, in which a particle damper is fixed. The particle damper is fixed to the inner wall of the particle damping module cavity by angle steel. Dry fine sand is filled in the particle damper inside the particle damping module cavity to form a fine sand filling layer. The fine sand filling layer has the function of vibration reduction and changing the damping of the system. A water injection hole is opened on one side of the particle damping module, and a drainage hole is opened on the other side of the particle damping module.

[0009] The particle damper is filled with dodecagonal or spherical particles with a diameter between 0.5 mm and 3.5 mm, and the particle filling amount is 90%-98%.

[0010] The viscous damping module includes a viscous damping module cavity, inside which a viscous damper is placed. The viscous damping module cavity has an opening, through which a connection interface extends a detachable damping and vibration reduction module.

[0011] The cavity of the viscous damping module is filled with a high-viscosity viscoelastic damping fluid, and the dynamic viscosity of the damping fluid is not less than 10000 mm. 2 / s, density is 0.96~1.35g / cm³ 3 .

[0012] The viscous damping module cavity is sealed with two layers of steel plates.

[0013] The rigid connecting rod and the connecting interface are connected by through bolts.

[0014] The two connection interfaces are connected by a rigid connecting rod.

[0015] The detachable damping vibration reduction module has fixing rings at both ends on one side, and the port of the U-shaped pipe clamp is fixed on the fixing ring.

[0016] The beneficial effects of this invention are:

[0017] This invention provides a novel approach to the coupled construction of a vibration reduction system. It couples a particle damping module with a viscous damping module, resulting in a coupled damping vibration reduction method that achieves full-frequency vibration reduction in pipelines. This helps reduce pipeline vibration and noise in industrial production, creating highly stable pipeline systems. Specifically:

[0018] I. The fine sand material filling the particle damping module has excellent vibration reduction effect on low and medium frequency vibrations due to its inherent vibration characteristics, with a minimum vibration transmission efficiency between 0.22 and 0.35. From the perspective of the overall effective acceleration value, it can enable the vibrating pipeline to achieve a good vibration reduction effect in all three spatial directions.

[0019] II. The vibration isolation cavity structure used in each detachable damping vibration reduction module consists of two viscous damping module cavities and one particle damping module cavity separated by a steel plate. This effectively isolates the damping fluid in the viscous damping module while allowing the particle damping module to be connected to the viscous damping module via connectors. This ensures that the particle damping module can effectively dissipate high-frequency, low-amplitude vibrations that the viscous damping module cannot receive.

[0020] Third, by injecting water into the particle damping module, the water droplets can make the sand layer inside the cavity denser, and the injected fluid can also play an effective role in vibration reduction by changing the system damping, thereby adjusting the damping ratio of the vibration reduction system, reducing the impact of vibration on the target structure, and thus achieving the purpose of vibration control. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the variable stiffness coupled damping vibration reduction device for vibrating pipelines according to the present invention;

[0022] Figure 2 This is a cross-sectional view of the detachable damping module in the variable stiffness coupled damping vibration reduction device for vibrating pipelines according to the present invention.

[0023] In the diagram, 1 is a rigid connecting rod;

[0024] 2. Detachable damping vibration reduction module, 2-1. Dry fine sand; 2-2. Viscous damper; 2-3. Water inlet hole; 2-4. Drain hole; 2-5. Viscous damping module cavity; 2-6. Particle damper; 2-7. Angle steel; 2-8. Damping fluid; 2-9. Particle damping module cavity;

[0025] 3. Connection interface, 4. Connection clamp, 5. Vibration pipeline, 6. Through-connection bolt, 7. Fixing ring. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] This invention relates to a variable stiffness coupled damping vibration reduction device for vibrating pipelines, such as... Figure 1 , 2 As shown, the system includes several detachable damping vibration reduction modules 2 connected in series. Each detachable damping vibration reduction module 2 has viscous damping modules at both ends, and a particle damping module is fixed between two viscous damping modules. The viscous damping modules and the particle damping modules are separated by a steel plate. Each viscous damping module contains a viscous damper 2-2. A connection interface 3 is fixed on one side of each viscous damper 2-2, and a detachable damping vibration reduction module 2 extends out from the other side of the connection interface 3. Adjacent detachable damping vibration reduction modules 2 are connected as follows: one end of the connection interface 3 of one detachable damping vibration reduction module 2 is connected to the other end of another detachable damping vibration reduction module 2 through a rigid connecting rod 1. The rigid connecting rod 1 and the connection interface are connected by through-bolts 6. A U-shaped pipe clamp 4 is fixed on one side of each detachable damping vibration reduction module 2 for fixing the vibrating pipe 5. Fixing rings 7 are fixed at both ends of one side of each detachable damping vibration reduction module 2, and the ports of the U-shaped pipe clamps 4 are fixed to the fixing rings 7.

[0028] The particle damping module includes a particle damping module cavity 2-9, inside which a particle damper 2-6 is fixed. The particle damper 2-6 is fixed to the inner wall of the particle damping module cavity 2-9 by angle steel 2-7. The particle material filled inside the particle damper 2-6 is a dodecahedral sphere or sphere with a particle diameter between 0.5 mm and 10 mm, and the filling amount is 90%-98%. Dry fine sand 2-1 is filled outside the particle damper 2-6 inside the particle damping module cavity to form a fine sand filling layer. The fine sand filling layer has the function of vibration reduction and changing the damping of the system. A water injection hole 2-3 is opened on one side of the particle damping module, and a drainage hole 2-4 is opened on the other side of the particle damping module.

[0029] The viscous damping module includes a viscous damping module cavity 2-5, inside which a viscous damper 2-2 is placed. The viscous damping module cavity 2-5 has an opening through which a detachable damping and vibration reduction module 2 extends from the connection interface 3. The viscous damping module cavity 2-5 is filled with a high-viscosity viscoelastic damping fluid, the dynamic viscosity of which is not less than 10000 mm⁻¹. 2 / s, density is 0.96g / cm³ 3 Up to 1.35 g / cm 3 Generally speaking, the higher the density, the higher the viscosity of the liquid.

[0030] The principle of this invention is that it does not require sealing.

[0031] In practical implementation, the present invention can adjust the number and distance of dampers installed according to the spacing of the vibration pipeline, thereby achieving variable stiffness and adjustable damping of the vibration reduction system.

[0032] The viscous damper 2-2, located within the viscous damping module cavity 2-5, can achieve extension and contraction vibrations based on the vibration of the vibrating pipeline 5, thus forming an action system. Furthermore, the rigid connecting rod 1 of the detachable damping and vibration reduction module is freely adjustable, and the length of the rigid connecting rod 1 can be increased for connection when the distance between pipelines is large.

[0033] The particle damping module utilizes water injection into the vibration isolation cavity. The water droplets compact the sand layer within the cavity, and the injected fluid alters the system's damping, effectively reducing vibration. This regulates the damping ratio of the vibration reduction system, mitigating the impact of vibration on the target structure and achieving vibration control. The fine sand filling within the module exhibits excellent vibration reduction for low- and mid-frequency vibrations due to its inherent vibration characteristics, with a minimum vibration transmission efficiency between 0.22 and 0.35. From the perspective of overall effective acceleration, the vibration pipeline achieves excellent vibration reduction in all three spatial directions.

[0034] In summary, the damping ratio and response frequency of the damper can be adjusted by increasing or decreasing the number of detachable damping vibration reduction modules 2, and the increased damping is equal to 2.2-3.5 times the sum of the damping ratios of all modules. 总 =b(C1+C2+C3+··+C f ), where b is a value between 2.2 and 3.5, and the specific value is calculated based on the actual project.

[0035] Example 1

[0036] In this embodiment, the variable stiffness coupled damping vibration reduction device for vibrating pipelines of the present invention is applied to the pipeline equipment of the vibrating water collection pipeline in the oilfield water injection pump room to reduce the vibration of the water injection vibrating pipeline, wherein the number of collection pipes is 5;

[0037] Therefore, five detachable damping and vibration reduction modules 2 are used for connection; among them, the particle material filled in the particle dampers 2-6 is a dodecahedral sphere with a particle diameter of 2.2mm and a filling amount of 92%;

[0038] The dynamic viscosity of the damping fluid in cavity 2-5 of the viscous damping module is 10000 mm³. 2 / s, density is 0.96g / cm³ 3 .

[0039] Example 2

[0040] In this embodiment, the variable stiffness coupled damping vibration reduction device for vibrating pipelines of the present invention is used on the pipeline equipment for external transmission of oil from oilfield pumping stations to reduce vibration of external transmission pumps and pipelines. The device has one pipeline.

[0041] Therefore, a detachable damping and vibration reduction module 2 is used for connection; the particle material filled in the particle damper 2-6 is a spherical particle with a particle diameter of 4.2 mm and a filling amount of 94%;

[0042] The dynamic viscosity of the damping fluid in cavity 2-5 of the viscous damping module is 10000 mm³. 2 / s, density is 0.98g / cm³ 3 .

[0043] Example 3

[0044] In this embodiment, the variable stiffness coupled damping vibration reduction device for vibrating pipelines of the present invention is applied to the vibrating pipeline equipment of a natural gas air cooler to reduce vibration in the cooled vibrating natural gas pipeline.

[0045] Therefore, three detachable damping and vibration reduction modules 2 are used for connection; among them, the particle damper 2-6 is filled with dodecahedral spheres with a particle diameter of 4mm and a filling amount of 96%.

[0046] The dynamic viscosity of the damping fluid in cavity 2-5 of the viscous damping module is 10000 mm³. 2 / s, with a density of 0.97g / cm3.

[0047] Example 4

[0048] This embodiment applies the variable stiffness coupled damping vibration reduction device for vibrating pipelines in the present invention to the vibration reduction device for vibrating pipelines of large centrifuges in power plants, and provides vibration reduction for the vibrating pipelines of large centrifuge units, wherein the device has 4 pipelines.

[0049] Therefore, four detachable damping and vibration reduction modules 2 are used for connection; among them, the particle dampers 2-6 are filled with spherical particles with a diameter of 10mm and a filling amount of 98%.

[0050] The dynamic viscosity of the damping fluid in cavity 2-5 of the viscous damping module is 10000 mm³. 2 / s, density is 1.26g / cm³ 3 .

Claims

1. A variable stiffness coupled damping vibration reduction device for vibrating pipelines, characterized in that, The system includes several detachable damping vibration reduction modules (2) connected in series. Each detachable damping vibration reduction module (2) has two viscous damping modules at both ends. A particle damping module is fixed between two viscous damping modules. The viscous damping modules and the particle damping modules are separated by a steel plate. Each viscous damping module is equipped with a viscous damper (2-2). Each viscous damper (2-2) has a connection interface (3) fixed on one side. The other side of the connection interface (3) extends out of the detachable damping vibration reduction module (2). The connection method of adjacent detachable damping vibration reduction modules (2) is as follows: the connection interface (3) at one end of one detachable damping vibration reduction module (2) is connected to the connection interface (3) at the other end of another detachable damping vibration reduction module (2). A U-shaped pipe clamp (4) is fixed on one side of each detachable damping vibration reduction module (2). The particle damping module includes a particle damping module cavity (2-9), in which a particle damper (2-6) is fixed. The particle damper (2-6) is fixed to the inner wall of the particle damping module cavity (2-9) by an angle steel (2-7). Dry fine sand (2-1) is filled inside the particle damper (2-6) of the particle damping module cavity (2-9) to form a fine sand filling layer. The fine sand filling layer has the function of vibration reduction and changing the damping of the system. A water injection hole (2-3) is opened on one side of the particle damping module, and a drainage hole (2-4) is opened on the other side of the particle damping module. The particle damper (2-6) is filled with dodecahedral spheres or spheres with a particle diameter between 0.5 mm and 12 mm, and the filling amount is 80%-90%. The viscous damping module includes a viscous damping module cavity (2-5), inside which a viscous damper (2-2) is placed. The viscous damping module cavity (2-5) has an opening, and the connection interface (3) extends out of the opening to form a detachable damping vibration reduction module (2).

2. The variable stiffness coupled damping vibration reduction device for vibrating pipelines as described in claim 1, characterized in that, The viscous damping module cavity (2-5) is filled with high-viscosity viscoelastic damping liquid, the dynamic viscosity of the damping liquid is not less than 10000mm 2 / s, the density is 0.96g / cm 3 .

3. The variable stiffness coupled damping vibration reduction device for vibrating pipelines as described in claim 2, characterized in that, The viscous damping module cavity (2-5) is a heat-insulating and sealing structure made of double-layer composite. It consists of a hollow structure formed by welding two inner and outer layers. The hollow part is a vacuum with a pressure of 0.001 Pa, which can effectively reduce the transmission of heat and vibration.

4. The variable stiffness coupled damping vibration reduction device for vibrating pipelines as described in claim 1, characterized in that, The rigid connecting rod (1) and the connecting interface (3) are connected by a through connecting bolt (6); the two connecting interfaces (3) are connected by the rigid connecting rod (1).

5. The variable stiffness coupled damping vibration reduction device for vibrating pipelines as described in claim 1, characterized in that, The detachable damping vibration reduction module (2) has fixed rings (7) at both ends on one side, and the port of the U-shaped pipe clamp (4) is fixed on the fixed rings (7).

Images