High-temperature pipeline heat insulation and vibration reduction mechanism and design method thereof

Abstract

The application discloses a high-temperature pipeline heat insulation and vibration reduction mechanism and a design method thereof. The mechanism comprises a clamp installed on a high-temperature pipeline and two groups of rubber vibration isolators, bolts, heat insulation sleeves, heat insulation sheets and heat dissipation sheets arranged at two ends of the clamp respectively. The upper and lower sides of the end of the clamp are periodically staggered and stacked with the heat insulation sheets and the heat dissipation sheets, all the heat insulation sheets and the heat dissipation sheets of the clamp and the upper and lower sides thereof are penetrated by the bolts and are tightly connected on the rubber vibration isolators, the rubber vibration isolators are used for supporting the high-temperature pipeline and isolating vibration, the heat insulation sleeves are sleeved on the bolts and separate the bolts from the clamp so as to prevent the high-temperature pipeline from transmitting heat to the bolts through the clamp, the heat insulation sheets are used for preventing the high-temperature pipeline from transmitting heat to the bolts or the rubber vibration isolators through the clamp, and the heat dissipation sheets are used for radiating heat to air so as to prevent heat accumulation and penetrate the heat insulation sleeves and the heat insulation sheets. The mechanism can introduce the rubber vibration isolator with wideband vibration reduction capacity and used at normal temperature into the high-temperature pipeline supporting structure.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction and noise reduction, specifically to a high-temperature pipeline heat insulation and vibration reduction mechanism and its design method. Background Technology

[0002] Under low-speed cruising conditions, vibration and noise from the propulsion system are the main sources of radiated noise on ships. For ships propelled by steam or powered by steam-generated electricity, the vibration and noise problem of the steam system is particularly prominent. Previously, vibration and noise control of steam systems often focused only on the system equipment. In recent years, with the deepening of relevant theoretical analysis and engineering practice, the vibration and noise control of high-temperature steam pipelines has gradually received attention. Pipelines are not only channels for transmitting equipment vibration, but also excitation sources of vibration and noise themselves. The steam flow velocity in pipelines reaches 30–50 m / s, which can generate a significant high-frequency excitation effect on the pipelines.

[0003] Because steam is a high-temperature medium, rubber vibration isolators used in normal-temperature pipelines cannot be directly applied to steam pipelines. Currently, metal damping vibration isolators are often used for vibration isolation of high-temperature steam pipelines. The elastic deformation of these isolators mainly comes from the metal helical spring, which has a significant standing wave effect in the high-frequency range, leading to a decrease in vibration reduction capacity. Their structural damping mainly comes from the deformation of the metal damping block under spring compression. They can achieve good damping effect under low-frequency, large-displacement vibration conditions, but their damping dissipation capacity is weak under high-frequency, small-displacement vibration conditions.

[0004] As can be seen from the above, high-frequency flow-induced vibration characteristics are obvious in high-temperature pipelines. Rubber vibration isolators cannot be used directly, while metal damping vibration isolators have poor vibration reduction effect in the high-frequency range. Summary of the Invention

[0005] The purpose of this invention is to provide a high-temperature pipeline heat insulation and vibration reduction mechanism and its design method. This mechanism reduces heat accumulation and can dissipate heat in a timely manner. It can introduce rubber vibration isolators with broadband vibration reduction capabilities that can be used at room temperature into the high-temperature pipeline support structure, thereby realizing high-frequency flow-induced vibration control of high-temperature pipelines and improving the broadband vibration reduction effect.

[0006] The technical solution adopted in this invention is:

[0007] A high-temperature pipeline heat insulation and vibration reduction mechanism includes a clamp installed on the high-temperature pipeline and two sets of rubber vibration isolators, bolts, heat insulation sleeves, heat insulation sheets, and heat dissipation fins respectively disposed at both ends of the clamp. The heat insulation sheets and heat dissipation fins are periodically staggered and stacked on the upper side and the lower side of the clamp end. All the heat insulation sheets and heat dissipation fins on the clamp end and its upper and lower sides are connected to the rubber vibration isolators by bolts. The rubber vibration isolators are used to support the high-temperature pipeline and isolate vibration. The heat insulation sleeve is fitted on the bolt and separates the bolt from the clamp, thereby preventing the high-temperature pipeline from transferring heat to the bolt through the clamp. The heat insulation sheets are used to prevent the high-temperature pipeline from transferring heat to the bolt or the rubber vibration isolators through the clamp. The heat dissipation fins are used to radiate heat to the air, thereby preventing heat from accumulating and penetrating the heat insulation sleeve and heat insulation sheets.

[0008] Preferably, a gap is left between the heat insulation sleeve and the bolt.

[0009] Preferably, during installation, for existing high-temperature pipelines, the mechanism replaces the original support feet of the high-temperature pipelines.

[0010] Preferably, the heat insulation sleeve and heat insulation sheet are made of engineering plastics with high hardness, high strength and high temperature resistance.

[0011] Preferably, the heat sink has a larger diameter than the heat insulation sheet and is made of a metal material with good heat dissipation performance.

[0012] Preferably, the natural frequency of the rubber vibration isolator is 6 to 12 Hz and the damping ratio is 0.05 to 0.12.

[0013] The design method for the above-mentioned high-temperature pipeline heat insulation and vibration reduction mechanism is as follows:

[0014] S1. Based on the weight distribution of the high-temperature pipeline, especially the distribution location of the high-mass components concentrated in the high-temperature pipeline, determine the distribution location of the heat insulation and vibration damping mechanism of the high-temperature pipeline and the rated load of the rubber vibration isolator.

[0015] S2. Determine the model and dynamic stiffness of the rubber vibration isolator based on the main characteristic excitation frequency of the high-temperature pipeline and its connected equipment;

[0016] S3. Based on the size and operating temperature of the high-temperature pipeline, the interface size and allowable operating temperature of the rubber vibration isolator, and the mode of heat radiation and heat conduction, determine the size specifications of the heat insulation sleeve, heat insulation sheet and heat sink, as well as the number of stacking cycles on the upper and lower sides of the clamp, to ensure that the overall dynamic stiffness of the periodically stacked heat insulation sheet and heat sink is more than one order of magnitude higher than the dynamic stiffness of the rubber vibration isolator, so as to give full play to the vibration isolation effect.

[0017] S4. Calculate and evaluate the load-bearing capacity, heat insulation and heat dissipation effect, and vibration reduction effect of the high-temperature pipeline insulation and vibration reduction mechanism. If the evaluation meets the requirements, the design is completed. If the evaluation does not meet the requirements, repeat steps S1 to S3.

[0018] The equation for the heat conduction process is:

[0019]

[0020] In the formula, ρ is density, c is specific heat, k is thermal conductivity, and x is distance;

[0021] The equation for the thermal radiation process is:

[0022]

[0023] In the formula, q in For the input heat flux density, q rad is the radiative heat flux density.

[0024] The beneficial effects of this invention are:

[0025] This mechanism adopts an integrated design for heat insulation and heat dissipation, which reduces heat accumulation and enables timely heat dissipation. Therefore, it can introduce rubber vibration isolators with broadband vibration reduction capabilities that can be used at room temperature into the high-temperature pipeline support structure. Compared with the commonly used metal damping vibration isolators, it realizes high-frequency flow-induced vibration control of high-temperature pipelines and improves the broadband vibration reduction effect. The mechanism matches the heat insulation components, heat dissipation components, and vibration isolation components into a whole, reducing the space and weight resource occupation and making it convenient for installation in confined spaces. Attached Figure Description

[0026] Figure 1 This is a perspective view of the high-temperature pipeline heat insulation and vibration reduction mechanism during installation in an embodiment of the present invention.

[0027] Figure 2 This is a cross-sectional view of the high-temperature pipeline heat insulation and vibration reduction mechanism during installation in an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the arrangement of the high-temperature pipeline heat insulation and vibration reduction mechanism in an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the heat conduction and heat radiation processes in an embodiment of the present invention.

[0030] Figure 5 This is a comparison diagram of the vibration isolation effects of rubber vibration isolators and metal damping vibration isolators in the embodiments of the present invention.

[0031] In the diagram: 1-High-temperature pipeline; 2-Clamp; 3-Heat sink; 4-Insulation sheet; 5-Rubber vibration isolator; 6-Bolt; 7-Insulation sleeve; 8-High-temperature pipeline heat insulation and vibration reduction mechanism; 9-Metal corrugated pipe; 10-Equipment; 11-Vibration isolator; 12-Floating raft. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0037] like Figure 1 and Figure 2 As shown, this embodiment provides a high-temperature pipeline heat insulation and vibration damping mechanism 8, including a clamp 2 installed on the high-temperature pipeline 1 (such as...). Figure 1As shown, the inner side of the clamp 2 can be provided with anti-slip texture, and two sets of rubber vibration isolators 5, bolts 6, heat insulation sleeves 7, heat insulation sheets 4, and heat dissipation fins 3 are respectively provided at both ends of the clamp 2. Among them, the high-temperature pipeline 1 refers to the pipeline through which the high-temperature medium passes; in this embodiment, it is a high-temperature steam pipeline. The heat insulation sheets 4 and heat dissipation fins 3 are periodically staggered and stacked on the upper side and the lower side of the clamp 2. All the heat insulation sheets 4 and heat dissipation fins 3 at the end of the clamp 2 and on its upper and lower sides are periodically staggered and stacked on the rubber vibration isolators 5 through bolts 6. Vibration isolators 5 are used to support and isolate the high-temperature pipeline 1 (i.e., the rubber vibration isolators 5 bear the static load and thermal deformation load of the high-temperature pipeline 1 during normal operation, and attenuate the transmission of vibration of the high-temperature pipeline 1 to the pipeline support and other structures). A heat-insulating sleeve 7 is fitted onto the bolt 6 and separates the bolt 6 from the clamp 1, thus preventing the high-temperature pipeline 1 from transferring heat to the bolt 6 through the clamp 2. A heat-insulating sheet 4 is used to prevent the high-temperature pipeline 1 from transferring heat to the bolt 6 or the rubber vibration isolators 5 through the clamp 2. A heat sink is used to radiate heat to the air, thus preventing heat accumulation and penetration of the heat-insulating sleeve and sheet. This mechanism adopts an integrated design of heat insulation and heat dissipation, reducing heat accumulation and enabling timely heat dissipation. Therefore, it allows the introduction of rubber vibration isolators 5, which have wide-band vibration reduction capabilities and are designed for use at room temperature, into the support structure of the high-temperature pipeline 1. Compared with commonly used metal damping vibration isolators, this achieves high-frequency flow-induced vibration control of the high-temperature pipeline and improves the wide-band vibration reduction effect. This mechanism integrates the heat insulation components, heat dissipation components, and vibration isolators into a single unit, reducing space and weight resource occupation and facilitating installation in confined spaces.

[0038] In this embodiment, preferably, a gap is left between the heat insulation sleeve 7 and the bolt 6; the existence of the gap can not only improve the heat insulation effect, but also prevent the heat insulation sleeve 7 from being damaged by long-term vibration and friction.

[0039] In this embodiment, preferably, during installation, for the existing high-temperature pipeline 1, the entire mechanism replaces the original support feet of the high-temperature pipeline 1, saving the time of determining the distribution position of the mechanism.

[0040] In this embodiment, preferably, the heat insulation sleeve 7 and the heat insulation sheet 4 are made of engineering plastic with high hardness, high strength and high temperature resistance; while performing the heat insulation effect, the heat insulation sleeve 7 and the heat insulation sheet 4 also have good load-bearing capacity, and form a stiffness and impedance matching with the rubber vibration isolator 5 to ensure the vibration reduction effect of the rubber vibration isolator 5.

[0041] In this embodiment, preferably, the heat sink 3 has a larger diameter than the heat insulation sheet 4 and is made of a metal material with good heat dissipation effect to increase the heat dissipation effect.

[0042] In this embodiment, preferably, the natural frequency of the rubber vibration isolator 5 is 6–12 Hz and the damping ratio is 0.05–0.12; Figure 5As shown, compared with metal damping vibration isolators, rubber vibration isolators 5 have a lower natural frequency and greater structural damping, and have a broadband vibration reduction effect, making them suitable for high-frequency flow-induced vibration control in high-temperature pipelines 1.

[0043] The design method of the above-mentioned high-temperature pipeline heat insulation and vibration damping mechanism 8 is as follows:

[0044] S1. Based on the weight distribution of high-temperature pipeline 1, especially the distribution location of high-mass components (valves, metal bellows 9, etc.) concentrated in high-temperature pipeline 1, determine the distribution and installation location of the high-temperature pipeline heat insulation and vibration damping mechanism 8 (e.g., Figure 3 As shown, this is the distribution location provided in this embodiment, and the rated load of the rubber vibration isolator 5;

[0045] S2. Determine the model and dynamic stiffness of the rubber vibration isolator 5 based on the main characteristic excitation frequency of the high-temperature pipeline 1 and its connected equipment;

[0046] S3. Based on the dimensions and operating temperature of the high-temperature pipeline 1, the interface dimensions and allowable operating temperature of the rubber vibration isolator 5, and the methods of heat radiation and heat conduction, determine the dimensions and specifications of the heat insulation sleeve 7, the heat insulation sheet 4, and the heat sink 3, as well as the number of stacking cycles on the upper and lower sides of the clamp 2, to ensure that the overall dynamic stiffness of the periodically stacked heat insulation sheet 4 and heat sink 3 is more than one order of magnitude higher than the dynamic stiffness of the rubber vibration isolator 5, so as to give full play to the vibration isolation effect.

[0047] S4. Calculate and evaluate the load-bearing capacity, heat insulation and heat dissipation effect and vibration reduction effect of the high-temperature pipeline insulation and vibration reduction mechanism 8. If the evaluation meets the requirements, the design is completed. If the evaluation does not meet the requirements, repeat steps S1 to S3.

[0048] like Figure 4 The diagram shows the processes of thermal radiation and heat conduction. The equation for the heat conduction process is:

[0049]

[0050] In the formula, ρ is density, c is specific heat, k is thermal conductivity, and x is distance;

[0051] The equation for the thermal radiation process is:

[0052]

[0053] In the formula, qin is the input heat flux density, and qrad is the radiative heat flux density.

[0054] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A high-temperature pipeline heat insulation and vibration damping mechanism, characterized in that: The system includes clamps installed on high-temperature pipelines, two sets of rubber vibration isolators at both ends of the clamps, bolts, heat insulation sleeves, heat insulation sheets, and heat dissipation fins. Heat insulation sheets and heat dissipation fins are periodically staggered upwards on the upper side and periodically staggered downwards on the lower side of the clamp ends. All heat insulation sheets and heat dissipation fins at the clamp ends and on both sides are bolted through and pressed onto the rubber vibration isolators. The rubber vibration isolators support the high-temperature pipeline and isolate vibrations. The heat insulation sleeves are fitted onto the bolts and separate the bolts from the clamps, thus preventing the high-temperature pipeline from transferring heat to the bolts through the clamps. The heat insulation sheets prevent the high-temperature pipeline from transferring heat to the bolts or rubber vibration isolators through the clamps. The heat dissipation fins radiate heat into the air, preventing heat accumulation and penetration of the heat insulation sleeves and heat insulation sheets. A gap is left between the heat insulation sleeves and the bolts.

2. The high-temperature pipeline heat insulation and vibration damping mechanism as described in claim 1, characterized in that: During installation, for existing high-temperature pipelines, the high-temperature pipeline heat insulation and vibration damping mechanism replaces the original support feet of the high-temperature pipeline.

3. The high-temperature pipeline heat insulation and vibration damping mechanism as described in claim 1, characterized in that: The heat insulation sleeve and heat insulation sheet are made of high-hardness, high-strength, and high-temperature resistant engineering plastics.

4. The high-temperature pipeline heat insulation and vibration damping mechanism as described in claim 1, characterized in that: The heat sink has a larger diameter than the insulation sheet and is made of a metal material with good heat dissipation performance.

5. The high-temperature pipeline heat insulation and vibration damping mechanism as described in claim 1, characterized in that: The natural frequency of the rubber vibration isolator is 6~12Hz and the damping ratio is 0.05~0.

12.

6. The design method of the high-temperature pipeline heat insulation and vibration damping mechanism as described in any one of claims 1 to 5, characterized in that: S1. Based on the weight distribution of the high-temperature pipeline, determine the distribution location of the high-temperature pipeline heat insulation and vibration damping mechanism and the rated load of the rubber vibration isolator; S2. Determine the model and dynamic stiffness of the rubber vibration isolator based on the main characteristic excitation frequency of the high-temperature pipeline and its connected equipment; S3. Based on the size and operating temperature of the high-temperature pipeline, the interface size and allowable operating temperature of the rubber vibration isolator, and the mode of heat radiation and heat conduction, determine the size and specifications of the heat insulation sleeve, heat insulation sheet and heat sink, as well as the number of stacking cycles on the upper and lower sides of the clamp, to ensure that the overall dynamic stiffness of the periodically stacked heat insulation sheet and heat sink is more than one order of magnitude higher than the dynamic stiffness of the rubber vibration isolator, so as to give full play to the vibration isolation effect. S4. Calculate and evaluate the load-bearing capacity, heat insulation and heat dissipation effect, and vibration reduction effect of the high-temperature pipeline insulation and vibration reduction mechanism. If the evaluation meets the requirements, the design is completed. If the evaluation does not meet the requirements, repeat steps S1 to S3.

7. The design method of the high-temperature pipeline heat insulation and vibration damping mechanism as described in claim 6, characterized in that, The equation for the heat conduction process is: In the formula, Here, c is density, k is specific heat, x is thermal conductivity, t is distance, and T is time. The equation for the thermal radiation process is: In the formula, For the input heat flux density, is the radiative heat flux density.

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