Vibration reduction connecting pipe of steam inlet and exhaust pipeline and design method

Abstract

The invention discloses a damping connecting pipe for a steam inlet and exhaust pipeline. The damping connecting pipe comprises a first pipe body, a second pipe body and an elastic connecting piece, the first pipe body and the second pipe body have the same pipe diameter and are coaxially arranged, and a limiting gap is reserved between the end part of the first pipe body and the end part of the second pipe body; the elastic connecting piece is of an annular elastic structure capable of axially deforming and radially deforming and is arranged outside the first pipe body and the second pipe body in a sleeving mode. And the elastic connecting piece is connected with the outer walls of the first pipe body and the second pipe body respectively. The invention further provides a design method of the steam exhaust pipeline cabin-penetrating connecting joint and the vibration reduction connecting pipe. The vibration reduction connecting pipe has the beneficial effects that the elastic connecting piece capable of axially deforming and radially deforming is designed, when equipment vibrates, the radial deformation of the elastic connecting piece is used for reducing vibration of radial vibration, the axial deformation of the elastic connecting piece is used for reducing vibration of axial vibration, and the vibration reduction performance of the whole vibration reduction connecting pipe is improved.

Description

Technical Field

[0001] The 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 have long sailing times, many crew members, and complex layouts of cabins and onboard equipment. The vibration and noise levels in the cabins not only affect the quality of life and work of the crew, but may also affect the normal operation of precision equipment on board. For large ships, large power equipment such as gas turbines and diesel engines on board are usually arranged on the lower deck in consideration of factors such as weight center, stability, and efficiency. Among them, the equipment's steam inlet and exhaust pipelines are relatively long in overall length, with complex vibration and noise characteristics, and affect a wide range of cabins due to their characteristics of running through multiple decks, large pipeline diameters, multiple supports, complex space layout, and transporting high-temperature and high-speed smoke in the pipes. In order to reduce the violent vibration of prime movers such as gas turbines and diesel engines that are transmitted along the pipeline channel to the surrounding decks and cabins, low-rigidity vibration-damping pipes are usually installed at the equipment inlet and outlet to form an impedance mismatch to achieve the purpose of ship vibration reduction and cabin vibration control.

[0003] For vibration reduction and isolation of high-temperature pipelines, metal bellows and other pipeline vibration reduction components are usually used, taking into account vibration reduction and thermal deformation compensation capabilities, and the relevant technical foundation is relatively mature. At present, a series of standards have been formed in China in the design and manufacturing of metal bellows expansion joints. In terms of product research and development, a company has produced a corrugated expansion joint for the exhaust system of a diesel generator set, which is mainly composed of front and rear connecting flanges, an intermediate metal bellows joint, a tie rod, etc. The metal bellows joint is arranged axially, which can effectively reduce the transmission of the diesel generator set's own vibration along the axial direction of the pipeline, and take into account the axial displacement compensation function. However, this design form leads to relatively weak radial compensation capacity of the expansion joint, and the vibration reduction effect is significantly poor. The company also produced another type of exhaust pipe corrugated expansion joint, which contains two discontinuous corrugated joints in the middle. This structural form can effectively enhance the radial compensation capacity of the expansion joint, but it has the disadvantages of a large axial length and is not conducive to actual ship layout.

[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 an intake and exhaust pipeline and a vibration reduction method in view of the deficiencies in the prior art, so as to improve the vibration reduction effect.

[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; 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 outside 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.

[0007] 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.

[0008] According to the above solution, the axial corrugated section includes a plurality of axial corrugated sections which are continuous and connected in sequence.

[0009] According to the above scheme, the radial 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 at the innermost side is connected to the first tube body or the second tube body; the bending section is a radial corrugated section.

[0010] According to the above solution, the width of the limiting gap is 15mm~25mm.

[0011] According to the above scheme, the vibration-damping connecting pipes of the steam inlet and exhaust pipes are made of metal materials, and the various components are connected by welding.

[0012] The present invention also adopts a design method for vibration reduction pipe connection of the steam inlet and exhaust pipes as described above, which is: 1) According to the diameter, thickness and spatial layout of typical steam inlet and exhaust pipelines, determine the overall structural parameters of the corresponding vibration reduction pipes for the steam inlet and exhaust pipelines; 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 form the characteristic curve of the material properties and cross-sectional structural parameters of the radial curved elastic body and the axial corrugated section on the dynamic stiffness of the vibration damping pipe of the inlet and exhaust pipelines; 6) Calculate and form the characteristic curve 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 form the characteristic curves of the material properties and cross-sectional structural parameters of the radial curved elastic body and the axial corrugated section and the thermal stress and thermal deformation; 8) Determine the design values ​​of the corresponding target parameters based on the analysis results and the design requirements for vibration reduction, impact resistance and thermal deformation of the steam inlet and exhaust pipes. According to the obtained characteristic curve, select the material properties and cross-sectional structural parameter combination that meet the design requirements, and verify whether the calculation results of the target parameters of the dynamic stiffness, impact stiffness, thermal stress and thermal deformation of the vibration reduction 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 reduction pipe; if the design requirements are not met, reselect the parameter combination for verification until a parameter combination that meets the requirements is obtained; 9) According to the obtained design parameters, the various components are processed and connected to complete the manufacture of the vibration reduction pipes for the steam inlet and exhaust pipelines.

[0013] 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 connecting flange to perform simulation calculation of dynamic stiffness.

[0014] 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.

[0015] 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.

[0016] The beneficial effects of the present invention are: 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 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 reduction performance of the entire vibration-damping pipe.

[0017] 2. The combined design of the elastic connector and the limiting gap in the present invention enables the pipe to have the ability to compensate for axial and radial thermal deformation and impact displacement, while reducing sudden changes in the flow channel, not increasing fluid resistance, and reducing flow noise.

[0018] 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.

[0019] 4. The vibration reduction 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 of ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of a specific embodiment of the present invention.

[0021] Figure 2 It is a cross-sectional view of this embodiment (with a flange connected to the pipeline).

[0022] Figure 3 It is a schematic diagram of overall parameters of the second embodiment.

[0023] Figure 4 Schematic diagram of parameters of the radial curved elastic body in Example 2.

[0024] Figure 5 It is a parameter diagram of the axial corrugated section in the second embodiment.

[0025] Figure 6 This is a cross-sectional view of the processing mold of the radial curved surface elastomer in Example 1.

[0026] 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. limiting gap. DETAILED DESCRIPTION

[0027] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] like Figure 1 and Figure 2 The vibration-damping pipe for the steam inlet and exhaust pipeline shown in the figure comprises a first pipe body 1, a second pipe body 2 and an elastic connecting piece; 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; The elastic connector is an annular elastic structure that can be axially and radially deformed, and is sleeved outside 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.

[0029] In the present invention, when the elastic connecting member is subjected to external force vibration, the vibration is absorbed by axial deformation and radial deformation, thereby achieving a vibration reduction effect.

[0030] Preferably, the width of the limiting gap 7 is 15 mm to 25 mm.

[0031] 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 radial curved surface elastomer 4 is arranged on the inner side of each external tube body 5, and the radial curved surface elastomer 4 is connected to the outer wall of the first tube body 1 or the second tube body 2; the radial curved surface elastomer 4 can be deformed radially along the first tube body 1 or the second tube body 2.

[0032] 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.

[0033] Preferably, the axial corrugation section 3 includes a plurality of continuous and sequentially connected axial corrugation sections, and the width of the axial corrugation section is 10 mm.

[0034] Preferably, the radial 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 at 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.

[0035] 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 a plurality of bending joints 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 joints is consistent with the axial direction of the outer tube body 5.

[0036] In the present invention, the two outer tube bodies 5 are coaxially arranged with the first tube body 1 and the second tube body 2 .

[0037] In the present invention, the vibration-damping pipe of the steam inlet and exhaust pipe is made of metal material, and each component is welded and connected. Specifically, the radial curved elastic body 4 is made of metal material, such as stainless steel, high damping alloy, etc.; the other parts of the vibration-damping pipe are made of stainless steel material, and are all welded and connected.

[0038] In the present invention, when the equipment vibrates, the axial corrugated section 3 of the exhaust pipe vibration-damping pipe reduces the vibration along the axial direction of the pipe, and the radial curved elastic body 4 of the exhaust pipe reduces the vibration along the radial direction of the pipe, while having the ability to compensate for axial and radial thermal deformation and impact displacement.

[0039] In the present invention, the design and implementation of the vibration reduction connection pipe of the steam inlet and exhaust pipelines involve vibration isolation, anti-impact verification calculation and parameter matching selection.

[0040] A design method for a vibration reduction pipe connection for an inlet and exhaust steam pipeline, the method comprising: 1) According to the diameter d, thickness t and spatial layout of the typical steam inlet and exhaust pipelines, determine the overall structural parameters of the corresponding steam inlet and exhaust pipeline vibration reduction pipe, including: outer pipe diameter D=d+20t and length L, outer pipe thickness (consistent with the thickness of the steam inlet and exhaust pipelines), and the distance H between the outer pipe and the inner pipe (H=10t).

[0041] In the present invention, the outer pipe body 5 of the steam inlet and exhaust pipeline is an outer pipe, and the first pipe body 1 and the second pipe body 2 constitute an inner pipe. The outer pipe diameter D of the steam inlet and exhaust pipeline 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.

[0042] 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 radius of the arc segment is r1=1.5t, the angle is 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.

[0043] 3) Formulate the initial cross-sectional structural parameters of the axial corrugated section, including: the axial length of the axial 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 corrugated sections is 3.

[0044] 4) Based on the structural parameters of the vibration-damping nozzle of the steam inlet and exhaust pipelines, a three-dimensional model of the vibration-damping nozzle of the steam inlet and exhaust pipelines is established, including the pipeline connection flange 6.

[0045] 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 inlet 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 inlet and exhaust pipes is studied and formed, and the characteristic curve of the cross-sectional characteristic parameters and the dynamic stiffness is formed.

[0046] In the present invention, the vibration reduction effect is generally evaluated by the dynamic stiffness of the vibration reduction pipe, and the dynamic stiffness can be calculated by the existing method. The smaller the dynamic stiffness, the better the vibration reduction effect. Specifically, 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 connection flange of the first inner pipe 1 to perform simulation calculation of the dynamic stiffness, and then a characteristic curve is drawn according to the calculation results.

[0047] 6) Based on the same initial three-dimensional model, the finite element method is used to carry out simulation analysis on the impact resistance of the vibration damping pipe of the steam inlet and exhaust pipes, and the material properties and cross-sectional structural parameters of the radial curved elastic body 4 and the axial corrugated section and the characteristic curve of the impact stiffness of the vibration damping pipe are calculated and formed.

[0048] In the present invention, the impact resistance is generally evaluated by the impact stiffness of the vibration-damping pipe. The greater the impact stiffness, the better the impact resistance. Specifically, finite element software is used to apply the time domain calculation method, and axial and radial impact accelerations are applied to the connecting flange of the first inner pipe 1 to perform simulation calculations of the impact stiffness, and a characteristic curve is drawn according to the calculation results; the time domain impact acceleration is selected according to the corresponding standard specifications.

[0049] 7) Based on the same initial three-dimensional model, the finite element method is used to carry out simulation analysis on the thermal deformation performance of the vibration reduction pipe of the steam inlet and exhaust pipes, 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.

[0050] In the present invention, the thermal deformation performance is generally evaluated by the thermal stress and thermal deformation of the vibration-damping pipe. The smaller the thermal stress and thermal deformation, the better the thermal deformation displacement compensation capability. Specifically, the finite element software is used to apply an initial normal temperature field (generally 25 degrees Celsius) to the first inner tube 1 and the second inner tube 2, and then the temperature is raised to the working temperature to perform simulation calculations of thermal stress and thermal deformation, and then a characteristic curve is drawn according to the calculation results.

[0051] 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, the design values ​​of the corresponding target parameters (the target parameters are also dynamic stiffness, impact stiffness, thermal stress and thermal deformation) are determined. According to the obtained characteristic curves (the material properties and cross-sectional structural parameters of the vibration-damping pipe and the characteristic curves of dynamic stiffness, impact stiffness, thermal stress and thermal deformation), the material properties and cross-sectional structural parameter combinations that meet the design requirements are selected, and three-dimensional modeling and finite element simulation calculations are carried out 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 (such as the calculated value of the dynamic stiffness should be lower than the design value of the dynamic stiffness, and the calculated values ​​of other parameters should not be lower than the corresponding design values), this parameter combination is the processing and manufacturing design parameters of the exhaust pipe vibration-damping pipe; if the design requirements are not met, the parameter combination is reselected for verification until a parameter combination that meets the requirements is obtained.

[0052] 9) According to the obtained design parameters, complete the processing of various components, and connect them through welding to complete the manufacturing of the vibration reduction pipes for the steam inlet and exhaust pipelines.

[0053] Embodiment 1 like Figure 1 The figure shows a DN300 low-rigidity, high-temperature-resistant inlet and exhaust steam pipeline vibration-damping pipe pipe used for ship diesel engines, comprising a first pipe body 1 and a second pipe body 2 coaxially arranged in the upper and lower parts, a 15 mm limit gap 7 is left 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 in 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 surface elastomer 4, and the inner lower end of the radial curved surface 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 surface elastomer 4, and the inner upper end of the radial curved surface elastomer 4 is connected to the outer wall of the second pipe body 2.

[0054] Embodiment 2 The design method of the exhaust pipe connection in the embodiment is as follows: Figures 3-5 As shown, according to the typical ship diesel engine inlet and exhaust pipe pipe diameter d = 300mm, pipe thickness t = 4mm and spatial layout factors, the outer pipe diameter of the vibration damping pipe is confirmed to be D = d + 20t, the thickness is consistent with the outer pipe, the length is L (determined according to the axial space length restriction requirements), 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 is 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 size of the axial corrugated section: the axial length of the corrugated section is l2=0.25L, the radial height is h=2.5t, the thickness is t2=1mm, the radius of the arc section is r2=0.75t, the angle is θ=90°, and the number of axial corrugations is 3; then adopt 4)~7) of the above method to obtain the design parameters of the vibration reduction pipe of the inlet and exhaust pipeline: length L=160mm, the distance between the outer pipe and the inner pipe is H=40mm, the axial length of the radial curved elastic body 4 is l1=40mm, the radius of the arc section is r1=6mm, the thickness is 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.

[0055] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0056] 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, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope 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 outside 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.

2. The vibration-damping pipe for steam inlet and exhaust pipes according to claim 1, characterized in that: 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 elastic body is arranged on the inner side of each external tube body, and the radially curved elastic body is connected to the outer wall of the first tube body or the second tube body; the radially curved elastic body can be deformed along the radial direction of the first tube body or the second tube body.

3. The vibration-damping pipe for steam inlet and exhaust pipes according to claim 2, characterized in that: The axial corrugation section includes a plurality of axial corrugation sections which are continuous and connected in sequence.

4. The vibration-damping pipe for steam inlet and exhaust pipes according to claim 2 or 3, characterized in that: The radial 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 an 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; the bending section is a radial corrugated section.

5. 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.

6. 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 pipelines are made of metal materials, and the various components are connected by welding.

7. A design method for vibration-damping pipes for steam inlet and exhaust pipes as claimed in claim 4, characterized in that: The method is: 1) According to the diameter, thickness and spatial layout of typical steam inlet and exhaust pipelines, determine the overall structural parameters of the corresponding vibration reduction pipes for the steam inlet and exhaust pipelines; 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 form the characteristic curve of the material properties and cross-sectional structural parameters of the radial curved elastic body and the axial corrugated section on the dynamic stiffness of the vibration damping pipe of the inlet and exhaust pipelines; 6) Calculate and form the characteristic curve 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 form the characteristic curves of the material properties and cross-sectional structural parameters of the radial curved elastic body and the axial corrugated section and the thermal stress and thermal deformation; 8) Determine the design values ​​of the corresponding target parameters based on the analysis results and the design requirements for vibration reduction, impact resistance and thermal deformation of the steam inlet and exhaust pipes. According to the obtained characteristic curve, select the material properties and cross-sectional structural parameter combination that meet the design requirements, and verify whether the calculation results of the target parameters of the dynamic stiffness, impact stiffness, thermal stress and thermal deformation of the vibration reduction 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 reduction pipe; if the design requirements are not met, reselect the parameter combination for verification until a parameter combination that meets the requirements is obtained; 9) According to the obtained design parameters, the various components are processed and connected to complete the manufacture of the vibration reduction pipes for the steam inlet and exhaust pipelines.

8. The design method for vibration-damping pipes for steam inlet and exhaust pipes according to claim 7, 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 pipe connecting flange to perform simulation calculations of dynamic stiffness.

9. The design method for vibration-damping pipes for steam inlet and exhaust pipes according to claim 7, characterized in that: Finite element software is used to apply a time domain calculation method, and axial and radial impact accelerations are applied to the first inner pipe connection flange to perform simulation calculations of impact stiffness.

10. The method for designing vibration-damping pipes for steam inlet and exhaust pipes according to claim 7, characterized in that: 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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