A stretch lock type displacement compensation vibration reduction pipe

Abstract

The present invention discloses a stretching energy-locking displacement compensation vibration-damping pipe, which belongs to the technical field of ship vibration and noise reduction. The vibration-damping pipe includes an energy-locking frame, filling rubber, an inner wall coating and a marine flange; a hollow V-shaped unit cell is processed on the energy-locking frame, and the symmetry center line of the V-shaped unit cell is perpendicular to the end face of the cylindrical structure; two circles of V-shaped unit cells arranged circumferentially on the surface of the cylindrical structure form a group of unit cell rings, and the sides of the V-shaped unit cells in the two circles of unit cell rings are embedded in each other but do not intersect; the unit cell rings are evenly distributed axially on the surface of the cylindrical structure; the filling rubber is filled in the V-shaped unit cell, and the inner wall coating is evenly distributed on the inner circumferential surface of the energy-locking frame filled with the filling rubber, and the marine flange is connected to the left and right ends of the energy-locking frame. The present invention can effectively enhance the axial tensile displacement compensation capability of the vibration-damping pipe, while improving the load-bearing stability and impact resistance of the pipe, and achieve a certain low-frequency vibration isolation effect of the pipeline.

Description

Technical Field

[0001] The invention belongs to the technical field of ship vibration reduction and noise reduction, and in particular relates to a stretch-lock type displacement compensation vibration reduction pipe. Background Art

[0002] Ships are the water deterrent force that all countries are focusing on developing today, and their acoustic stealth performance is directly related to their own vitality and combat effectiveness. Reducing ship noise and enhancing the acoustic stealth effect of ships are of great military significance. Ship pipelines are important systems inside ships, and they transmit gas / water / oil and other media in various systems, such as ventilation ducts throughout the ship, hydraulic pump control oil circuits, water circuits, auxiliary circulating water, seawater and shaft seawater pipelines. Among them, fluid pressure pulsation and pipe wall structure noise are one of the main noise sources of ships. How to effectively control the noise transmission of the pipeline system is an important topic of ship acoustic stealth.

[0003] In order to enhance the low-frequency vibration isolation effect, traditional vibration-damping pipes usually need to have lower axial stiffness, but this results in a lower critical instability load for axial tension, that is, under a larger axial tension load, the pipeline is prone to instability, resulting in damage or even leakage. At the same time, under long-term axial tension loads, the inside of the pipeline is prone to fatigue damage due to the large strain level. How to effectively avoid the above-mentioned adverse effects caused by axial tension loads while ensuring the low-frequency vibration isolation effect of traditional vibration-damping pipes is a very challenging and important task. Summary of the invention

[0004] In view of this, the present invention provides a stretch-lock type displacement compensation vibration-damping pipe, which can effectively enhance the axial stretch displacement compensation capability of the vibration-damping pipe, while improving the bearing stability and impact resistance of the pipe, and achieving a certain low-frequency vibration isolation effect of the pipeline.

[0005] A stretching locking type displacement compensation vibration reduction pipe, comprising a locking frame, a filling rubber, an inner wall coating and a marine flange;

[0006] The energy lock skeleton is a cylindrical structure with two open ends, and a hollow V-shaped unit cell is processed on the cylindrical structure, and the symmetry center line of the V-shaped unit cell is perpendicular to the end face of the cylindrical structure; two circles of V-shaped unit cells arranged circumferentially on the surface of the cylindrical structure form a group of unit cell rings, and the side edges of the V-shaped unit cells in the two circles of unit cell rings are embedded in each other but do not intersect; the unit cell rings are evenly distributed axially on the surface of the cylindrical structure; the area between the unit cell rings forms an annular bottom plate, the area between two adjacent V-shaped unit cells in a group of unit cell rings forms an axial connection part, and the area between the opposite side edges of the V-shaped unit cells forms an oblique connection part;

[0007] The filling rubber is filled in the V-shaped unit cell, the inner wall coating is evenly distributed on the inner circumference of the energy-locking frame filled with the filling rubber, and the marine flange is connected to the left and right ends of the energy-locking frame.

[0008] Furthermore, the energy-locking frame is made of vulcanized rubber or polyurethane polymer material.

[0009] Furthermore, the modulus of the filling rubber is 3 to 4 orders of magnitude smaller than that of the energy-locking skeleton material, and the length, width, thickness and angle design parameters of the filling rubber are adjustable.

[0010] Furthermore, the connection between the inner contour of the unit cell of the energy-locking skeleton and the filling rubber is achieved by vulcanization or bonding.

[0011] Furthermore, the energy-locking skeleton is processed by polymer additive manufacturing or mold casting.

[0012] Furthermore, the filling rubber is processed through a foaming process based on the energy-locking skeleton structure in cooperation with inner and outer cylindrical molds.

[0013] Furthermore, the inner wall coating is used to prevent the medium inside the pipeline from corroding the energy locking frame and the filling rubber.

[0014] Furthermore, the outer side surface of the inner wall coating is connected to the inner side surface of the energy locking frame and the inner side surface of the filling rubber by vulcanization or bonding.

[0015] Furthermore, the material and size parameters of the V-shaped unit cells in the energy-locking skeleton and the internal filling rubber are distributed in a gradient manner along the axial direction of the connecting pipe.

[0016] Beneficial effects:

[0017] 1. The energy lock skeleton of the present invention is processed with a hollow V-shaped unit cell, and the symmetry center line of the V-shaped unit cell is perpendicular to the end face of the cylindrical structure. The above structure can enhance the axial tensile displacement compensation ability of the vibration-damping pipe, limit the load threshold when the axial tensile impact occurs, and improve the axial load-bearing safety of the vibration-damping pipe in actual service. At the same time, based on the axially arranged periodic structure, a certain low-frequency vibration isolation effect of the pipeline can be achieved by designing using the principles of Bragg scattering and local resonance.

[0018] 2. When the energy-locking skeleton of the present invention is subjected to axial tensile force, the oblique connection part in the same level of the unit cell ring of the energy-locking skeleton will bend and deform until the distance between the axial connection part and the annular bottom plate is the maximum, and then the next level of V-shaped unit cells will be continuously triggered to repeat the above deformation. Under quasi-static tensile loading and dynamic impact conditions, the V-shaped unit cells in the energy-locking skeleton can effectively control the load threshold of the pipe end, thereby protecting the connected equipment.

[0019] 3. The present invention aims at different application scenarios of the vibration-damping pipe, and by selecting a locking skeleton structure with different materials and parameter designs, different axial and radial stiffnesses and critical loads for tensile displacement compensation can be achieved. Different inner wall coatings can be selected to meet the use requirements for different internal media of the pipeline (such as hydraulic oil, fuel oil, lubricating oil, water, air, etc.) and the external installation environment of the ship. For the connection requirements of pipelines of different calibers, different marine flanges can be selected for matching, but not limited to.

[0020] 4. The present invention can effectively enhance the axial tensile displacement compensation capability of the vibration-damping pipe, while having a compact structure and good process feasibility. It can also improve the bearing stability and impact resistance of the pipe, and can achieve a certain low-frequency vibration isolation effect of the pipeline through optimized design.

[0021] 5. The materials and dimensional parameters of the V-shaped unit cells and the internal filling rubber in the energy-locking skeleton of the present invention are gradiently distributed along the axial direction of the pipe, which can achieve a stepped compression energy-locking displacement compensation effect, enhance the axial compression displacement compensation capability of the vibration-damping pipe, increase the critical stress of the overall instability of the vibration-damping pipe, and improve the axial load-bearing safety of the vibration-damping pipe in actual service. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 , 2 It is a schematic diagram of the overall structure of the stretch-lock type displacement compensation vibration reduction pipe of the present invention;

[0023] Figure 3 It is a schematic structural diagram of the energy-locking skeleton of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the filling rubber of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the inner wall coating of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the marine flange of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the energy-locking framework of the present invention in an initial state;

[0028] Figure 8 It is a structural schematic diagram of the energy-locking framework of the present invention in an intermediate state;

[0029] Fig. 9 It is a structural schematic diagram of the energy-locking framework of the present invention in the final state;

[0030] Fig.10 It is a schematic structural diagram of a V-shaped unit cell of the energy-locking framework of the present invention in an initial state;

[0031] Fig.11 It is a schematic structural diagram of a V-shaped unit cell of the energy-locking skeleton of the present invention in an intermediate state;

[0032] Fig.12 It is a schematic structural diagram of the V-shaped unit cell of the energy-locking framework of the present invention in the final state;

[0033] Fig.13 It is the force-displacement curve of the whole process of the vibration reduction connection pipe of the present invention.

[0034] Among them, 1-energy locking skeleton, 11-left end face, 12-right end face, 13-inner side face, 14-outer side face, 15-V-shaped unit cell, 151-axial connecting part, 152-oblique connecting part, 153-annular bottom plate, 2-filling rubber, 21-rubber unit cell, 22-inner side face, 23-outer side face, 3-inner wall coating, 31-outer side face, 32-inner side face, 4-marine flange, 41-left marine flange, 42-right marine flange. DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0036] As attached Figure 1 and 2 As shown, the present invention provides a stretch-lock type displacement compensation vibration-damping pipe, which includes a lock frame 1, a filling rubber 2, an inner wall coating 3 and a marine flange 4.

[0037] As attached Figure 3 As shown, the energy-locking skeleton 1 is a cylindrical structure with two ends open, the cylindrical structure having a left end face 11, a right end face 12, an inner side face 13 and an outer side face 14, and a hollow V-shaped unit cell 15 is processed on the cylindrical structure, and the symmetry center line of the V-shaped unit cell 15 is perpendicular to the end face of the cylindrical structure; two circles of V-shaped unit cells 15 arranged circumferentially on the surface of the cylindrical structure form a group of unit cell rings, and the sides of the V-shaped unit cells 15 in the two circles of unit cell rings are embedded in each other but do not intersect; the unit cell rings are evenly distributed axially on the surface of the cylindrical structure; the area between the unit cell rings forms an annular bottom plate 153, the area between two adjacent V-shaped unit cells in a group of unit cell rings forms an axial connecting portion 151, and the area between the sides of the opposite V-shaped unit cells forms an oblique connecting portion 152.

[0038] The filling rubber 2 is filled in the V-shaped unit cell 15 , the inner wall coating 3 is evenly distributed on the inner circumference of the energy locking frame filled with the filling rubber, and two marine flanges 4 are connected to the left and right ends of the energy locking frame 1 .

[0039] As attached Figure 4 As shown, the filling rubber 2 includes a plurality of rubber cells 21 , and the rubber cells 21 have an inner side 22 and an outer side 23 .

[0040] As attached Figure 5 As shown, the inner wall coating 3 has an outer side 31 and an inner side 32 .

[0041] As attached Figure 6 As shown, the marine flange 4 includes a left marine flange 41 and a right marine flange 42 .

[0042] The energy lock frame 1 is made of, but not limited to, polymer materials such as vulcanized rubber and polyurethane, and has good elastic deformation performance and good fatigue resistance. The angle between the axial connection part 151 and the oblique connection part 152, the length, width, thickness and other design parameters of the axial connection part 151, the oblique connection part 152 and the annular bottom plate 153 are adjustable.

[0043] The filling rubber 2 is selected from but not limited to materials such as rubber-plastic foamed closed-cell sponge, which has good high recoverable elasticity, near-zero Poisson's ratio and good fatigue resistance. The modulus of the filling rubber 2 is about 3 to 4 orders of magnitude smaller than that of the energy-locking skeleton 1. The design parameters of the rubber unit cell 21, such as unit cell length, width, thickness, angle, etc., are adjustable.

[0044] The inner contour of the V-shaped unit cell 15 matches the outer shape of the rubber unit cell 21, and the connection method between the two is selected but not limited to polymer connection processes such as vulcanization and bonding.

[0045] The energy-locking skeleton 1 can be processed by, but not limited to, polymer additive manufacturing or mold casting. The filling rubber 2 is processed by, but not limited to, foaming technology in conjunction with the inner and outer cylindrical molds on the basis of the energy-locking skeleton 1.

[0046] The outer side surface 14 of the locking skeleton 1 and the outer side surface 23 of the filling rubber are selected with reference to the current ship pipeline coating standards but are not limited to elastic coating materials; the inner wall coating 3 is selected with reference to the type of medium inside the pipeline such as hydraulic oil, fuel, lubricating oil, water, air, etc. but is not limited to materials.

[0047] The energy lock frame 1, the filling rubber 2 and the inner wall coating 3 together form the main body of the tensile compensation energy lock pipeline structure. The left marine flange 41 and the right marine flange 42 are both fixed to the vibration reduction pipe body, and the nominal diameter, bolt hole center circle diameter, sealing surface outer diameter, bolt quantity and diameter and other related specifications are implemented in accordance with the requirements of "GB 569-65 Marine Flange Connection Dimensions and Sealing Surfaces". The end face of the vibration reduction pipe body consists of the left end face 11 of the energy lock frame structure and the right end face 12 of the energy lock frame structure.

[0048] The deformation process of the energy-locking skeleton from the initial state to the final state is shown in the attached figure. Figure 7-9As shown, when the energy-locking skeleton 1 is subjected to axial tension, the oblique connection portion 152 inside the V-shaped unit cell 15 will bend and deform until the distance between the axial connection portion 151 and the annular bottom plate 153 is the largest, and then the next level of V-shaped unit cells 15 will be continuously triggered to repeat the above deformation. The deformation process of the V-shaped unit cell 15 is shown in the attached figure. Figure 10-12 In the case of quasi-static tensile loading and dynamic impact, the V-shaped unit cell 15 can effectively control the load threshold of the nozzle end, thereby protecting the connected equipment.

[0049] The material, density, modulus and design parameters of the energy lock skeleton 1 can be adjusted in a targeted manner to achieve different axial and radial stiffnesses to meet different tensile displacement compensation requirements. Different inner wall coatings 3 can be selected to meet the use requirements for different internal media of pipelines such as hydraulic oil, fuel oil, lubricating oil, water, air, etc. and external installation environments of ships. For the connection requirements of pipelines of different calibers, different marine flanges 4 can be selected but not limited to for matching.

[0050] The inner side surface 13 of the energy locking frame 1 and the inner side surface 22 of the filling rubber 2 are both connected to the outer side surface 31 of the coating. The above connection method is selected from but not limited to polymer connection processes such as vulcanization and bonding.

[0051] The left marine flange 41 and the right marine flange 42 are connected to the flanges at the ends of the ship pipelines by bolts.

[0052] The material, size and other parameters of the V-shaped unit cell 15 and the rubber unit cell 21 can be distributed in a gradient along the axial direction of the pipe to achieve a step-by-step tensile lock displacement compensation effect, thereby enhancing the axial tensile displacement compensation capability of the vibration-damping pipe and improving the axial load-bearing safety of the vibration-damping pipe in actual service. At the same time, based on the axially arranged periodic structure, the Bragg scattering and local resonance principle can be used to design and achieve a certain low-frequency vibration isolation effect of the pipeline, thereby Fig.13 It can be seen from the force-displacement curve of the whole process of the vibration-damping pipe that the stretch-lock type displacement compensation vibration-damping pipe of the present invention can effectively enhance the axial stretch displacement compensation ability of the vibration-damping pipe.

[0053] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, 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 stretch-lock type displacement compensation vibration reduction pipe, characterized in that: Including locking frame, filling rubber, inner wall coating and marine flange; The energy lock skeleton is a cylindrical structure with two open ends, and a hollow V-shaped unit cell is processed on the cylindrical structure, and the symmetry center line of the V-shaped unit cell is perpendicular to the end face of the cylindrical structure; two circles of V-shaped unit cells arranged circumferentially on the surface of the cylindrical structure form a group of unit cell rings, and the side edges of the V-shaped unit cells in the two circles of unit cell rings are embedded in each other but do not intersect; the unit cell rings are evenly distributed axially on the surface of the cylindrical structure; the area between the unit cell rings forms an annular bottom plate, the area between two adjacent V-shaped unit cells in a group of unit cell rings forms an axial connection part, and the area between the opposite side edges of the V-shaped unit cells forms an oblique connection part; The filling rubber is filled in the V-shaped unit cell, the inner wall coating is evenly distributed on the inner circumference of the energy-locking frame filled with the filling rubber, and the marine flange is connected to the left and right ends of the energy-locking frame.

2. The stretch lock type displacement compensation vibration reduction pipe as claimed in claim 1, characterized in that: The energy-locking frame is made of vulcanized rubber or polyurethane polymer material.

3. The stretch lock type displacement compensation vibration reduction pipe as claimed in claim 2, characterized in that: The modulus of the filling rubber is 3 to 4 orders of magnitude smaller than that of the energy-locking skeleton material, and the length, width, thickness and angle design parameters of the filling rubber are adjustable.

4. The stretch-lock type displacement compensation vibration reduction pipe as claimed in claim 3, characterized in that: The connection between the inner contour of the unit cell of the energy-locking skeleton and the filling rubber is achieved by vulcanization or bonding.

5. The stretch-lock type displacement compensation vibration reduction pipe as claimed in claim 4, characterized in that: The energy-locking skeleton is processed by polymer additive manufacturing or mold casting.

6. The stretch-lock type displacement compensation vibration reduction pipe as claimed in claim 5, characterized in that: The filling rubber is processed through a foaming process on the basis of the energy-locking skeleton structure in cooperation with inner and outer cylindrical molds.

7. The stretch-lock type displacement compensation vibration reduction pipe as claimed in claim 6, characterized in that: The inner wall coating is used to prevent the medium inside the pipeline from corroding the energy locking frame and the filling rubber.

8. The stretch-lock type displacement compensation vibration reduction pipe as claimed in claim 7, characterized in that: The outer side surface of the inner wall coating is connected to the inner side surface of the energy locking frame and the inner side surface of the filling rubber by vulcanization or bonding.

9. The stretch-lock type displacement compensation vibration-damping pipe according to claim 7 or 8, characterized in that: The material and size parameters of the V-shaped unit cells in the energy-locking skeleton and the internal filling rubber are distributed in a gradient manner along the axial direction of the connecting pipe.

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