A vibration-damping pipe for steam inlet and exhaust pipes and its design method

Abstract

The present invention discloses a vibration-damping pipe for steam inlet and exhaust pipes, comprising a first pipe body, a second pipe body and an elastic connector; the first pipe body and the second pipe body have the same diameter and are coaxially arranged, and a limited gap is left between the end of the first pipe body and the end of the second pipe body; the elastic connector is an annular elastic structure that can deform axially and radially, and is sleeved on the outside of the first pipe body and the second pipe body; the elastic connector is connected to the outer walls of the first pipe body and the second pipe body, respectively. The present invention also provides a method for designing a steam exhaust pipe through-cabin connection node and a vibration-damping pipe. The beneficial effects of the present invention are: an elastic connector that can deform axially and radially is designed, and when the equipment vibrates, the radial vibration is reduced by the radial deformation of the elastic connector, and the axial vibration is reduced by the axial deformation of the elastic connector, thereby improving the vibration-damping performance of the entire vibration-damping pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of ship vibration reduction and noise reduction, and in particular to a vibration reduction pipe connection for steam inlet and exhaust pipelines and a design method thereof. Background Art

[0002] Large ships sail for long periods of time, have large crews, and have complex cabin and onboard equipment layouts. The vibration and noise levels in the cabins not only affect the crew's quality of life and work, but may also affect the normal operation of the ship's precision equipment. For large ships, large power equipment such as gas turbines and diesel engines are usually arranged on the lower deck due to factors such as weight center, stability, and efficiency. Among them, the equipment's steam inlet and exhaust pipes are relatively long due to their characteristics of running through multiple decks, large pipe diameters, multiple supports, complex spatial layout, and transporting high-temperature and high-speed smoke in the pipes. As a result, the overall length of the steam inlet and exhaust pipes is relatively long, the vibration and noise characteristics are complex, and the impact range is wide. In order to reduce the severe vibration of the prime movers such as gas turbines and diesel engines that is transmitted along the pipeline channel to the surrounding decks and cabins, low-rigidity vibration damping pipes are usually installed at the equipment inlets and outlets to form an impedance mismatch to achieve the purpose of ship vibration reduction and cabin vibration control.

[0003] For vibration isolation and reduction of high-temperature pipelines, metal bellows and other pipeline vibration reduction components are commonly used, balancing vibration isolation and thermal deformation compensation. The relevant technical foundation is relatively mature. Currently, a series of standards have been established in China for the design and manufacturing of metal bellows expansion joints. In terms of product development, a company has produced a corrugated expansion joint for the exhaust system of a diesel generator set. The joint consists primarily of front and rear connecting flanges, a central metal bellows joint, and tie rods. The metal bellows are arranged axially, effectively reducing the transmission of the diesel generator set's own vibration outward along the pipeline axis while also compensating for axial displacement. However, this design results in relatively weak radial compensation capability and significantly poorer vibration reduction. The company also produces another type of exhaust pipe corrugated expansion joint with two discontinuous corrugated sections in the middle. This design effectively enhances the radial compensation capability of the expansion joint, but suffers from a longer axial length, making it unsuitable for deployment on a ship.

[0004] In summary, current marine metal bellows mostly adopt the form of axially arranged bellows sections, which have good vibration reduction and thermal deformation compensation effects in the axial direction of the pipeline, but the axial vibration reduction effect of the pipeline is poor. Summary of the Invention

[0005] The purpose of the present invention is to provide a vibration reduction pipe for intake and exhaust pipes and a vibration reduction method to improve the vibration reduction effect, in order to address the deficiencies of the existing technology.

[0006] The technical solution adopted by the present invention is: a vibration-damping pipe for an inlet and exhaust steam pipeline, comprising a first pipe body, a second pipe body and an elastic connecting piece;

[0007] The first tube body and the second tube body have the same diameter and are coaxially arranged, and a limited gap is left between the end of the first tube body and the end of the second tube body;

[0008] The elastic connector is an annular elastic structure capable of axial and radial deformation, and is sleeved on the outside of the first tube body and the second tube body; the elastic connector is connected to the outer walls of the first tube body and the second tube body respectively.

[0009] According to the above scheme, the elastic connecting member includes an axial corrugated section in the middle and two external tube bodies symmetrically connected to the two ends of the axial corrugated section. A radially curved elastomer is arranged on the inner side of each external tube body, and the radially curved elastomer is connected to the outer wall of the first tube body or the second tube body; the radially curved elastomer can be deformed along the radial direction of the first tube body or the second tube body.

[0010] According to the above solution, the axial corrugated section includes a plurality of continuous and sequentially connected axial corrugated sections.

[0011] According to the above scheme, the radially curved elastomer includes a plurality of bending sections arranged radially and continuously along the first tube body or the second tube body, the end of the bending section outside the outermost side is connected to the end of the outer tube body away from the axial corrugated section, and the end of the bending section located on the innermost side is connected to the first tube body or the second tube body; the bending section is a radial corrugated section.

[0012] According to the above solution, the width of the limiting gap is 15mm~25mm.

[0013] According to the above solution, the vibration-damping connecting pipes for the steam inlet and exhaust pipes are made of metal materials, and the various components are connected by welding.

[0014] The present invention also adopts a design method for vibration-damping pipes for steam inlet and exhaust pipes as described above, which is:

[0015] 1) Determine the overall structural parameters of the corresponding vibration damping nozzles for the steam inlet and exhaust pipes based on the diameter, thickness, and spatial layout of the typical steam inlet and exhaust pipes;

[0016] 2) Formulate the initial cross-sectional structural parameters of the radial curved elastic body;

[0017] 3) Formulate the initial cross-sectional structural parameters of the axial corrugated section;

[0018] 4) Based on the initial structural parameters, establish the initial three-dimensional model of the vibration reduction nozzle of the steam inlet and exhaust pipelines;

[0019] 5) Calculate and generate characteristic curves of the material properties and cross-sectional structural parameters of the radial curved elastic body and the axial corrugated section in relation to the dynamic stiffness of the vibration damping pipes of the steam inlet and exhaust pipes;

[0020] 6) Calculate and generate characteristic curves of the material properties and cross-sectional structural parameters of the radial curved elastic body and the axial corrugated section and the impact stiffness of the vibration damping pipe;

[0021] 7) Calculate and generate characteristic curves of material properties and cross-sectional structural parameters of radial curved elastic body and axial corrugated section and thermal stress and thermal deformation;

[0022] 8) Based on the analysis results and the design requirements for vibration reduction, shock resistance, and thermal deformation of the steam inlet and exhaust pipes, determine the design values ​​of the corresponding target parameters. Based on the obtained characteristic curve, select a combination of material properties and cross-sectional structural parameters that meet the design requirements. Verify whether the calculation results of the target parameters of the dynamic stiffness, impact stiffness, thermal stress, and thermal deformation of the vibration damping pipe under this parameter combination meet the design requirements. If the design requirements are met, this parameter combination is the processing and manufacturing design parameters of the exhaust pipe vibration damping pipe. If not, reselect the parameter combination for verification until a parameter combination that meets the requirements is obtained.

[0023] 9) Based on the obtained design parameters, the various components are processed and connected to complete the manufacture of the vibration damping pipes for the steam inlet and exhaust pipes.

[0024] According to the above scheme, finite element calculation software is used and the modal superposition method is applied to apply axial and radial unit force sweep frequency excitation at the first inner tube connection flange to perform simulation calculation of dynamic stiffness.

[0025] According to the above scheme, finite element software is used and a time domain calculation method is applied to apply axial and radial impact accelerations at the first inner tube connection flange to perform simulation calculations of the impact stiffness.

[0026] According to the above scheme, finite element software is used to apply an initial normal temperature field to the first inner tube and the second inner tube, and then the temperature is raised to the working temperature to perform simulation calculations of thermal stress and thermal deformation.

[0027] The beneficial effects of the present invention are:

[0028] 1. Aiming at the vibration reduction and isolation of high-temperature steam inlet and exhaust pipelines of ships, the present invention proposes a vibration-damping pipe for exhaust pipelines. The pipe is designed with an elastic connector that can deform axially and radially. When the equipment vibrates, the radial deformation of the elastic connector is used to reduce the radial vibration, and the axial deformation of the elastic connector is used to reduce the axial vibration, thereby improving the vibration reduction performance of the entire vibration-damping pipe.

[0029] 2. The combined design of the elastic connector and the limiting gap in the present invention enables the pipe to compensate for axial and radial thermal deformation and impact displacement, while reducing flow channel mutations, not increasing fluid resistance, and reducing flow noise.

[0030] 3. In the present invention, the radial curved elastic body provides radial elastic support, and the axial corrugated section provides axial elastic support, which can attenuate the transmission of radial and axial vibrations outward along the pipeline and reduce the vibration noise level of the ship.

[0031] 4. The vibration-damping pipe in the present invention is made of all-metal material and is connected by welding, which can effectively withstand high-temperature environments and is suitable for vibration reduction treatment at the inlet and outlet of high-temperature steam inlet and exhaust pipes on ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a three-dimensional schematic diagram of a specific embodiment of the present invention.

[0033] Figure 2 This is a cross-sectional view of this embodiment (with a flange connected to the pipeline).

[0034] Figure 3 Schematic diagram of overall parameters of Example 2.

[0035] Figure 4 Schematic diagram of parameters of the radial curved elastic body in Example 2.

[0036] Figure 5 Schematic diagram of parameters of the axial corrugated section in Example 2.

[0037] Figure 6 This is a cross-sectional view of the processing mold of the radial curved surface elastomer in Example 1.

[0038] Among them: 1. first tube body; 2. second tube body; 3. axial corrugated section; 4. radial curved elastic body; 5. external tube body; 6. pipeline connecting flange; 7. limit gap. DETAILED DESCRIPTION

[0039] In order to better understand the present invention, the present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 and Figure 2 The vibration-damping pipe for the steam inlet and exhaust pipes shown in the figure comprises a first pipe body 1, a second pipe body 2 and an elastic connecting piece;

[0041] The first tube body 1 and the second tube body 2 have the same diameter and are coaxially arranged, and a limiting gap 7 is left between the end of the first tube body 1 and the end of the second tube body 2;

[0042] The elastic connector is an annular elastic structure capable of axial and radial deformation, and is sleeved on the outside of the first tube body 1 and the second tube body 2; the elastic connector is connected to the outer walls of the first tube body 1 and the second tube body 2 respectively.

[0043] In the present invention, when the elastic connecting member is subjected to external force vibration, the elastic connecting member absorbs the vibration through axial deformation and radial deformation, thereby achieving a vibration reduction effect.

[0044] Preferably, the width of the limiting gap 7 is 15 mm to 25 mm.

[0045] Preferably, the elastic connecting member includes an axial corrugated section 3 in the middle, and two external tube bodies 5 symmetrically connected to the two ends of the axial corrugated section 3, and a radially curved elastic body 4 is arranged on the inner side of each external tube body 5, and the radially curved elastic body 4 is connected to the outer wall of the first tube body 1 or the second tube body 2; the radially curved elastic body 4 can be deformed along the radial direction of the first tube body 1 or the second tube body 2.

[0046] In the present invention, the axial corrugated section 3 can be deformed along the axial direction of the first tube body 1 or the second tube body 2 to absorb the axial vibration of the exhaust pipe; the radial curved elastic body 4 can be deformed along the radial direction of the first tube body 1 or the second tube body 2 to absorb the radial vibration of the exhaust pipe.

[0047] Preferably, the axial corrugated section 3 includes a plurality of continuous and sequentially connected axial corrugated sections, and the width of the axial corrugated section is 10 mm.

[0048] Preferably, the radially curved elastomer 4 includes a plurality of bending sections arranged radially and continuously along the first tube body 1 or the second tube body 2, the end of the bending section outside the outermost side is connected to the end of the external tube body 5 away from the axial corrugated section, and the end of the bending section located on the innermost side is connected to the first tube body 1 or the second tube body 2; the bending section is a radial corrugated section.

[0049] In the present invention, the radial curved surface elastic body 4 is a body of revolution structure (the cross-sectional view of the processing mold is as shown in FIG. Figure 6 As shown), it includes multiple bending sections continuously arranged along the radial direction of the first tube body 1 or the second tube body 2, and the length direction of the bending section is consistent with the axial direction of the outer tube body 5.

[0050] In the present invention, the two outer tubes 5 are coaxially arranged with the first tube 1 and the second tube 2 .

[0051] In the present invention, the damping pipe for the steam inlet and exhaust pipes is made of metal, and the components are welded together. Specifically, the radially curved elastic body 4 is made of metal, such as stainless steel or a high-damping alloy; the other parts of the damping pipe are made of stainless steel and are welded together.

[0052] In the present invention, when the equipment vibrates, the axial corrugated section 3 of the exhaust pipe vibration-damping pipe damps the vibration along the axial direction of the pipe, and the radial curved elastic body 4 of the exhaust pipe damps the vibration along the radial direction of the pipe, while having the ability to compensate for axial and radial thermal deformation and impact displacement.

[0053] In the present invention, the design and implementation of the vibration-damping connecting pipes for the steam inlet and exhaust pipes involve vibration isolation, anti-impact verification calculation and parameter matching selection.

[0054] A design method for a vibration-damping nozzle for an inlet and exhaust steam pipeline is as follows:

[0055] 1) Based on the diameter d, thickness t, and spatial layout of typical steam inlet and exhaust pipes, determine the overall structural parameters of the corresponding steam inlet and exhaust pipe vibration damping nozzle, including: outer pipe diameter D = d + 20t and length L, outer pipe thickness (consistent with the thickness of the steam inlet and exhaust pipes), and the distance H between the outer pipe and the inner pipe (H = 10t).

[0056] In the present invention, the outer pipe body 5 of the steam inlet and exhaust pipe is the outer pipe, and the first pipe body 1 and the second pipe body 2 constitute the inner pipe. The outer pipe diameter D of the steam inlet and exhaust pipe vibration damping pipe is the diameter of the outer pipe body 5, such as Figure 4 As shown; the length L is determined according to the axial space length limitation requirements.

[0057] 2) Formulate the initial cross-sectional structural parameters of the radial curved elastic body 4, including: the axial length of the radial curved elastic body 4 is l1=0.25L, the arc segment radius r1=1.5t, the angle θ=90°, the number of radial corrugated sections (can be 2), and the thickness of the radial curved elastic body 4 is t1=0.5t.

[0058] 3) Formulate the initial cross-sectional structural parameters of the axial corrugated section, including: axial length l2=0.25L, radial height h=2.5t, thickness t2=1mm, arc segment radius r2=0.75t, angle θ=90°, and the number of axial corrugated sections is 3.

[0059] 4) Based on the structural parameters of the vibration damping pipe of the steam inlet and exhaust pipelines, a three-dimensional model of the vibration damping pipe of the steam inlet and exhaust pipelines is established, including the pipeline connection flange 6.

[0060] 5) The finite element method is used to carry out simulation analysis on the vibration isolation effect of the vibration damping pipe of the steam intake and exhaust pipes, and the influence of the material properties and cross-sectional structural parameters of the radial curved elastic body 4 and the axial corrugated section on the dynamic stiffness of the vibration damping pipe of the steam intake and exhaust pipes is studied and formed, and the characteristic curve of the cross-sectional characteristic parameters and dynamic stiffness is formed.

[0061] In the present invention, the vibration reduction effect is generally evaluated by the dynamic stiffness of the vibration reduction nozzle. Dynamic stiffness can be calculated using existing methods; smaller dynamic stiffness indicates better vibration reduction. Specifically, finite element calculation software and the modal superposition method are used to apply axial and radial unit force swept frequency excitation to the connecting flange of the first inner tube 1 to simulate the dynamic stiffness. A characteristic curve is then plotted based on the calculated results.

[0062] 6) Based on the same initial three-dimensional model, the finite element method is used to carry out simulation analysis of the impact resistance of the vibration damping pipe of the intake and exhaust pipes, and the characteristic curve of the material properties and cross-sectional structural parameters of the radial curved surface elastic body 4 and the axial corrugated section and the impact stiffness of the vibration damping pipe is calculated and formed.

[0063] In the present invention, shock resistance is generally evaluated using the impact stiffness of the vibration-damping nozzle; a higher impact stiffness indicates better shock resistance. Specifically, finite element software and a time-domain calculation method are used to simulate the impact stiffness by applying axial and radial impact accelerations to the connecting flange of the first inner tube 1. A characteristic curve is then plotted based on the calculation results. The time-domain impact acceleration is selected according to the relevant standards and specifications.

[0064] 7) Based on the same initial three-dimensional model, the finite element method is used to carry out simulation analysis of the thermal deformation performance of the vibration damping pipe of the intake and exhaust pipelines, and the material properties and cross-sectional structural parameters of the radial curved elastomer 4 and the axial corrugated section and the characteristic curves of thermal stress and thermal deformation are studied and formed.

[0065] In this invention, thermal deformation performance is generally evaluated using the thermal stress and thermal deformation of the vibration damping pipe. Lower thermal stress and thermal deformation indicate better thermal deformation compensation capability. Specifically, using finite element software, the first and second inner pipes 1 and 2 are subjected to an initial ambient temperature field (typically 25°C) and then heated to the operating temperature. This simulation calculates thermal stress and thermal deformation, and then plots characteristic curves based on the calculated results.

[0066] 8) Based on the analysis results and the design requirements for vibration reduction, impact resistance, and thermal deformation of the steam inlet and exhaust pipes, determine the design values ​​of the corresponding target parameters (the target parameters are dynamic stiffness, impact stiffness, thermal stress, and thermal deformation). According to the obtained characteristic curves (the characteristic curves of the material properties and cross-sectional structural parameters of the vibration damping pipe and the dynamic stiffness, impact stiffness, thermal stress, and thermal deformation), select a combination of material properties and cross-sectional structural parameters that meet the design requirements, and carry out three-dimensional modeling and finite element simulation calculations to verify whether the calculation results of the dynamic stiffness, impact stiffness, thermal stress, and thermal deformation of the vibration damping pipe under this parameter combination meet the design requirements. If the design requirements are met (for example, the calculated value of dynamic stiffness should be lower than the design value of dynamic stiffness, and the calculated values ​​of other parameters should not be lower than the corresponding design values), then this parameter combination is the processing and manufacturing design parameters of the exhaust pipe vibration damping pipe; if the design requirements are not met, reselect the parameter combination for verification until a parameter combination that meets the requirements is obtained.

[0067] 9) According to the obtained design parameters, complete the processing of each component and connect them through welding to complete the manufacture of the vibration reduction pipe of the steam inlet and exhaust pipelines.

[0068] Example 1

[0069] like Figure 1 The figure shows a DN300 low-rigidity, high-temperature resistant, inlet and exhaust pipe vibration-damping pipe used in marine diesel engines, comprising a first pipe body 1 and a second pipe body 2 coaxially arranged above and below, with a 15 mm limit gap 7 between the lower end of the first pipe body 1 and the upper end of the second pipe body 2; the first pipe body 1 and the second pipe body 2 are connected by an external elastic connecting piece; the elastic connecting piece includes an axial corrugated section 3 in the middle, and two external pipe bodies 5 located at the upper and lower parts respectively, the upper end of the upper external pipe body 5 is connected to the outer upper end of the radial curved elastomer 4, and the inner lower end of the radial curved elastomer 4 is connected to the lower end of the first pipe body 1; the lower end of the lower external pipe body 5 is connected to the outer lower end of the corresponding radial curved elastomer 4, and the inner upper end of the radial curved elastomer 4 is connected to the outer wall of the second pipe body 2.

[0070] Example 2

[0071] In the embodiment, the design method of the exhaust pipe is as follows: Figures 3-5 As shown, based on the pipe diameter d=300mm, pipe thickness t=4mm and spatial layout of a typical marine diesel engine intake and exhaust pipe, the outer pipe diameter D=d+20t of the vibration damping pipe is confirmed, the thickness is consistent with the outer pipe, the length L (determined according to the axial space length restriction requirement), and the distance between the outer pipe and the inner pipe is H=10t; the initial cross-sectional shape and size of the radial curved surface elastic body 4 are formulated: the axial length of the radial curved surface elastic body 4 is l1=0.25L, the radius of the arc segment r1=1.5t, the angle is θ=90°, the number of radial curved surface corrugations is 2, and the thickness is t 1=0.5t; formulate the initial cross-sectional shape and dimensions of the axial corrugated section: the axial length of the corrugated section l2=0.25L, the radial height h=2.5t, the thickness t2=1mm, the arc segment radius r2=0.75t, the angle θ=90°, and the number of axial corrugations 3; then, using 4) to 7) of the above method, the design parameters of the intake and exhaust pipe vibration damping nozzle are obtained as follows: length L=160mm, the distance between the outer tube and the inner tube is H=40mm, the axial length of the radial curved elastic body 4 is l1=40mm, the arc segment radius r1=6mm, and the thickness t1 =2mm; the axial length of the axial corrugated section is l2=40mm, the radial height is h=10mm, the thickness is t2=1mm, and the radius of the arc section is r2=3mm.

[0072] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0073] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vibration-damping pipe for steam inlet and exhaust pipes, characterized in that: It includes a first tube body, a second tube body and an elastic connecting piece; The first tube body and the second tube body have the same diameter and are coaxially arranged, and a limited gap is left between the end of the first tube body and the end of the second tube body; The elastic connector is an annular elastic structure capable of axial and radial deformation, and is sleeved on the outside of the first tube body and the second tube body; the elastic connector is connected to the outer walls of the first tube body and the second tube body respectively; The elastic connector includes an axial corrugated section in the middle and two outer tubes symmetrically connected to the two ends of the axial corrugated section. A radially curved elastic body is provided on the inner side of each outer tube, and the radially curved elastic body is connected to the outer wall of the first tube or the second tube. The radially curved elastic body deforms along the radial direction of the first tube or the second tube. The radially curved elastic body includes a plurality of bending sections continuously arranged along the radial direction of the first tube body or the second tube body, and the bending sections are radial corrugated sections.

2. The vibration-damping pipe for the steam inlet and exhaust pipes according to claim 1, characterized in that: The axial corrugated section includes a plurality of continuous and sequentially connected axial corrugated sections.

3. The vibration-damping pipe for the steam inlet and exhaust pipes according to claim 1 or 2, characterized in that: The end of the bending section outside the outermost side is connected to the end of the outer tube body away from the axial corrugated section, and the end of the bending section located at the innermost side is connected to the first tube body or the second tube body.

4. The vibration-damping pipe for steam inlet and exhaust pipes according to claim 1, characterized in that: The width of the limiting gap is 15mm~25mm.

5. The vibration-damping pipe for steam inlet and exhaust pipes according to claim 1, characterized in that: The vibration-damping connecting pipes for the steam inlet and exhaust pipes are made of metal materials, and the various components are welded together.

6. A design method for vibration-damping pipes for steam inlet and exhaust pipes as claimed in claim 3, characterized in that: The method is: 1) Determine the overall structural parameters of the corresponding vibration damping nozzles for the steam inlet and exhaust pipes based on the diameter, thickness, and spatial layout of the typical steam inlet and exhaust pipes; 2) Formulate the initial cross-sectional structural parameters of the radial curved elastic body; 3) Formulate the initial cross-sectional structural parameters of the axial corrugated section; 4) Based on the initial structural parameters, establish the initial three-dimensional model of the vibration reduction nozzle of the steam inlet and exhaust pipelines; 5) Calculate and generate characteristic curves of the material properties and cross-sectional structural parameters of the radial curved elastic body and the axial corrugated section in relation to the dynamic stiffness of the vibration damping pipes of the steam inlet and exhaust pipes; 6) Calculate and generate characteristic curves of the material properties and cross-sectional structural parameters of the radial curved elastic body and the axial corrugated section and the impact stiffness of the vibration damping pipe; 7) Calculate and generate characteristic curves of material properties and cross-sectional structural parameters of radial curved elastic body and axial corrugated section and thermal stress and thermal deformation; 8) Based on the analysis results and the design requirements for vibration reduction, shock resistance, and thermal deformation of the steam inlet and exhaust pipes, determine the design values ​​of the corresponding target parameters. Based on the obtained characteristic curve, select a combination of material properties and cross-sectional structural parameters that meet the design requirements. Verify whether the calculation results of the target parameters of the dynamic stiffness, impact stiffness, thermal stress, and thermal deformation of the vibration damping pipe under this parameter combination meet the design requirements. If the design requirements are met, this parameter combination is the processing and manufacturing design parameters of the exhaust pipe vibration damping pipe. If not, reselect the parameter combination for verification until a parameter combination that meets the requirements is obtained. 9) Based on the obtained design parameters, the various components are processed and connected to complete the manufacture of the vibration damping pipes for the steam inlet and exhaust pipes.

7. The design method for vibration-damping pipes for steam inlet and exhaust pipes according to claim 6, characterized in that: Finite element calculation software is used to apply the modal superposition method, and axial and radial unit force sweep frequency excitations are applied to the first inner tube connection flange to perform dynamic stiffness simulation calculations.

8. The method for designing a vibration-damping pipe for an intake and exhaust steam pipeline according to claim 6, wherein: Finite element software and a time domain calculation method are used to apply axial and radial impact accelerations to the first inner tube connection flange to perform simulation calculations of the impact stiffness.

9. The method for designing a vibration-damping pipe for an intake and exhaust steam pipeline according to claim 6, wherein: Finite element software is used to apply an initial normal temperature field to the first inner tube and the second inner tube, and then the temperature is raised to the working temperature to perform simulation calculations of thermal stress and thermal deformation.

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