A vibration damping bracket

Abstract

This application provides a vibration damping bracket, including a housing assembly, a passive vibration damping assembly, an active vibration damping assembly, and a guide rod. The housing assembly includes a first installation space and a second installation space. The passive vibration damping assembly is disposed in the first installation space, and the active vibration damping assembly is disposed in the second installation space. The guide rod includes a first end and a second end. The first end presses against the active vibration damping assembly, and the second end passes through the passive vibration damping assembly and extends to the outside of the housing assembly. By installing the passive vibration damping assembly in the first installation space of the housing assembly to achieve passive control, and installing the active vibration damping assembly in the second installation space of the housing assembly to achieve active control, a composite active-passive pipeline vibration damping bracket is formed. This bracket features adaptive frequency modulation, high precision, large output force, and small size. It has a good vibration damping and suppression effect for vibrations with obvious line spectrum characteristics and is suitable for vibration control of pipeline systems in marine systems.

Description

Technical Field

[0001] This application belongs to the field of pipeline installation technology, specifically relating to a vibration damping bracket. Background Technology

[0002] In shipboard systems, various mechanical equipment are typically connected via pipelines to transport media such as water, oil, and gas. During the layout of these pipeline systems, pipes are fixed to the foundation walls at intervals using supports or suspensions. The primary transmission path for vibrations generated by the pipeline system is along the media within the pipe, the pipe wall, and the pipe supports. Pipeline vibration affects the normal operation of the system, shortens the lifespan of pipe components, and can even cause loosening of pipe joints, leading to fluid leaks and pipe damage. Furthermore, with the effective control of noise from the ship's main and auxiliary power plants and propulsion systems, pipeline vibration noise has become a major factor affecting acoustic performance.

[0003] Currently, when controlling pipeline vibration, vibration isolation technologies such as flexible nozzles and elastic support structures are often used to reduce vibration energy across the entire frequency band. However, the above vibration control methods are not effective in reducing vibrations with obvious line spectrum characteristics. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this application is to provide a vibration damping bracket that can solve the problem of poor vibration damping and suppression effect of vibration control methods provided in related technologies on vibrations with obvious line spectrum characteristics.

[0005] To address the aforementioned issues, this application provides a vibration damping bracket, comprising a housing assembly, a passive vibration damping assembly, an active vibration damping assembly, and a guide rod; the housing assembly includes a first mounting space and a second mounting space, the passive vibration damping assembly is disposed within the first mounting space, the active vibration damping assembly is disposed within the second mounting space, and the guide rod includes a first end and a second end, the first end pressing against the active vibration damping assembly, and the second end passing through the passive vibration damping assembly and extending to the outside of the housing assembly.

[0006] Optionally, the passive vibration damping component includes a mass block, a first spring group, and a second spring group. The mass block includes a first end face and a second end face. The first spring group is disposed on the first end face, and the second spring group is disposed on the second end face.

[0007] Optionally, a through hole is provided at the center of the mass block, and the guide rod is installed in the through hole so that the mass block moves synchronously with the guide rod.

[0008] Optionally, the active vibration damping component includes a frame, a magnetostrictive rod is disposed in the central hole of the frame, the first end of the guide rod is connected to the magnetostrictive rod, a coil is fitted on the frame, and a permanent magnet is fitted on the coil.

[0009] Optionally, the frame includes a cylindrical body, a first end plate, and a second end plate, with the first end plate and the second end plate respectively arranged opposite to each other at both ends of the cylindrical body.

[0010] Optionally, the housing assembly includes an outer cylinder and a base, with one end of the outer cylinder disposed on the base, and a partition plate disposed on the inner wall of the outer cylinder to divide the inner cavity of the outer cylinder into a first installation space and a second installation space.

[0011] Optionally, the housing assembly further includes an adjusting nut, the outer surface of which is at least partially machined with external threads; the other end of the outer cylinder is machined with internal threads, the external threads engaging with the internal threads to screw the adjusting nut onto the outer cylinder.

[0012] Optionally, the housing assembly further includes a linear bearing, the guide rod being at least partially installed in the inner bore of the linear bearing so that the guide rod can move along the axial direction of the linear bearing, the center hole of the adjusting nut being a smooth hole, and the housing of the linear bearing being disposed within the smooth hole of the adjusting nut.

[0013] Optionally, the vibration damping bracket further includes a limiting sleeve, one end of which is located in the second installation space and disposed on the first end plate of the frame, the other end of which extends through the central hole of the partition plate into the first installation space, and the first end of the guide rod passes through the limiting sleeve and is connected to the magnetostrictive rod.

[0014] Optionally, the vibration damping bracket further includes a pipe clamp, which is disposed on the second end face of the guide rod.

[0015] Beneficial effects

[0016] 1. The vibration damping bracket provided in the embodiments of the present invention has a passive vibration damping component installed in the first installation space of the shell assembly to achieve passive control, and an active vibration damping component installed in the second installation space of the shell assembly to achieve active control, forming a composite active and passive pipeline vibration damping bracket. It has the characteristics of adaptive frequency modulation, high precision, large output force and small size. It has a good vibration damping and suppression effect for vibrations with obvious line spectrum characteristics, and is suitable for vibration control of pipeline systems in ship systems.

[0017] 2. The vibration damping bracket provided in the embodiments of the present invention uses a magnetostrictive rod with advantages such as good frequency adaptability, wide operating frequency range, high precision, and large output force. This avoids the adverse effects of the additional mass of vibration dampers in related technologies on the pipeline. The vibration damping bracket of this application has a strong load-bearing capacity. The compression amount of the first spring group and the second spring group and the compressive strain of the magnetostrictive rod can be changed by adjusting the nut to adapt to the load weight and pipeline frequency. The vibration damping bracket is easy to adjust and has stronger applicability.

[0018] 3. The vibration damping bracket provided in the embodiments of the present invention relies on the passive vibration damping component to drive the guide rod to press against the magnetostrictive rod, which has better high-frequency output characteristics and solves the shortcomings of related technologies such as serious coil heating, low energy conversion rate, weak high-frequency output and poor practical application effect during high-frequency vibration damping.

[0019] 4. The vibration damping bracket provided in the embodiments of the present invention is a composite vibration damping bracket formed by passive vibration damping components and active vibration damping components. It does not require the construction of an additional support structure for the vibration damping bracket and is not limited by installation and space size in actual application. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a vibration damping bracket according to an embodiment of this application.

[0021] The reference numerals in the attached figures are as follows:

[0022] 101-Base; 102-Linear bearing; 103-Adjusting nut; 104-Outer cylinder;

[0023] 201 - First spring assembly; 202 - Second spring assembly; 203 - Mass block;

[0024] 301 - Permanent magnet; 302 - Coil; 303 - Magnetostrictive rod; 304 - Frame;

[0025] 4-Limit sleeve;

[0026] 5-Guide rod;

[0027] 6-Pipe clamp. Detailed Implementation

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to 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 limiting the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0032] See also Figure 1 As shown, a vibration damping bracket provided according to an embodiment of this application includes a housing assembly, a passive vibration damping assembly, an active vibration damping assembly, and a guide rod 5; the housing assembly includes a first mounting space and a second mounting space, the passive vibration damping assembly is disposed in the first mounting space, the active vibration damping assembly is disposed in the second mounting space, and the guide rod 5 includes a first end and a second end, the first end presses against the active vibration damping assembly, and the second end passes through the passive vibration damping assembly and extends to the outside of the housing assembly.

[0033] Passive vibration damping components are installed in the first installation space of the shell assembly to achieve passive control, and active vibration damping components are installed in the second installation space of the shell assembly to achieve active control, forming a composite active and passive pipeline vibration damping support. It features adaptive frequency modulation, high precision, large output force, and small size, and is suitable for vibration control of pipeline systems in ship systems.

[0034] The passive vibration damping assembly includes a mass block 203, a first spring group 201, and a second spring group 202. The mass block 203 includes a first end face and a second end face. The first spring group 201 is disposed on the first end face, and the second spring group 202 is disposed on the second end face.

[0035] In the specific implementation process, the vibration is transmitted to the mass block 203 through the guide rod 5, and further acts on the first spring group 201 or the second spring group 202. When the first spring group 201 is compressed and the second spring group 202 is extended, or when the second spring group 202 is compressed and the first spring group 201 is extended, the mass block 203 moves downward or upward along with the guide rod 5, which consumes part of the vibration. At the same time, since the passive vibration damping component consumes part of the vibration, it also avoids the problem of severe heat generation of the active vibration damping component when actively controlling high-frequency vibration.

[0036] In this embodiment, both the first spring group 201 and the second spring group 202 consist of two springs; in other embodiments, the specific number of springs can be adjusted according to the specific working conditions and is not limited to two.

[0037] A through hole is provided at the center of the mass block 203, and the guide rod 5 is installed in the through hole so that the mass block 203 moves synchronously with the guide rod 5. This allows the guide rod 5 to transmit vibration to the mass block 203, and at the same time, the mass block 203 drives the guide rod 5 to move together during the energy dissipation and vibration reduction process, pressing against the active vibration damping component, so that the vibration damping bracket has better high-frequency output characteristics.

[0038] The guide rod 5 and the mass block 203 are tightly fitted, meaning that as the guide rod 5 moves up and down with the mass block 203, the position between the guide rod 5 and the mass block 203 remains fixed, ensuring the uniqueness of their movement.

[0039] More specifically, the shape of the through hole at the center of the mass block 203 is the same as the cross-sectional shape of the guide rod 5; in this embodiment, after the guide rod 5 is inserted into the through hole of the mass block 203, the two are fixed by welding. In other embodiments, the guide rod 5 and the through hole of the mass block 203 can also be an interference fit, in which case the diameter of the guide rod 5 is larger than the diameter of the through hole of the mass block 203.

[0040] The active vibration damping component includes a frame 304, a magnetostrictive rod 303 is disposed in the central hole of the frame 304, the first end of the guide rod 5 presses against the end of the magnetostrictive rod 303, a coil 302 is mounted on the frame 304, and a permanent magnet 301 is mounted on the coil 302.

[0041] When the coil 302 is connected to the alternating current, the coil 302 generates an excitation magnetic field, and the magnetostrictive rod 303 generates strain under the action of the magnetic field; at the same time, under the action of the bias magnetic field generated by the permanent magnet 301, the strain is linearized, and the frequency doubling phenomenon of the excitation and output of the active vibration damping component is eliminated.

[0042] Specifically, when the excitation magnetic field is in the same direction as the bias magnetic field of the permanent magnet 301, the superimposed magnetic field increases, and the magnetostrictive rod 303 elongates. When the excitation magnetic field is in the opposite direction to the bias magnetic field of the permanent magnet 301, the superimposed magnetic field decreases, and the magnetostrictive rod 303 shortens. Therefore, the magnetostrictive rod 303 autonomously expands and contracts under the action of the alternating magnetic field to achieve the purpose of vibration control. Simultaneously, the strength of the excitation magnetic field can be changed by altering the magnitude of the alternating current in the coil, thus controlling the amount of expansion and contraction of the magnetostrictive rod 303.

[0043] Specifically, the magnetostrictive rod 303 is a super magnetostrictive rod.

[0044] The permanent magnet 301 uses materials such as neodymium iron boron with high magnetic energy product, which can significantly reduce the volume of the vibration damping bracket, realize the miniaturization of the vibration damping bracket, and facilitate the application of the vibration damping bracket in confined spaces.

[0045] More specifically, in practical applications, the weight of the mass block 203, the stiffness of the first spring group 201 and the second spring group 202, the initial compression applied by the adjusting nut 103, the current of the driving coil 14 of the excitation magnetic field, and the parameters of the bias magnetic field permanent magnet 301 can be determined based on the characteristics of the pipeline system (structural dimensions, weight, and vibration characteristic spectrum) to achieve a hybrid active and passive vibration reduction based on magnetostriction drive.

[0046] The frame 304 includes a cylinder, a first end plate and a second end plate, with the first end plate and the second end plate arranged opposite to each other at both ends of the cylinder.

[0047] The first end plate, the second end plate, and the second mounting space together form a sealed chamber, in which the coil 302 and the permanent magnet 301 are located to restrict the axial and radial movement of the coil 302 and the permanent magnet 301.

[0048] Specifically, the first end plate, the second end plate, and the cylinder can be integrally formed or welded together.

[0049] The housing assembly includes an outer cylinder 104 and a base 101. One end of the outer cylinder 104 is mounted on the base 101. A partition plate is provided on the inner wall of the outer cylinder 104, dividing the inner cavity of the outer cylinder 104 into a first installation space and a second installation space. The arrangement of the partition plate enables the support and installation of the passive vibration damping component and the active vibration damping component.

[0050] The base 101 has a boss at its center, and the bottom of the cylinder on the frame 304 is fitted onto the boss to ensure that the active vibration damping component is coaxial with the housing component when it is installed.

[0051] The base 101 has mounting holes on its side to facilitate fixing the vibration damping bracket to the foundation.

[0052] The outer cylinder 104 is made of a material with moderate magnetic permeability to ensure the magnetic field strength around the magnetostrictive rod 303 while reducing magnetic leakage.

[0053] The housing assembly also includes an adjusting nut 103, the outer surface of which is at least partially machined with external threads; the other end of the outer cylinder 104 is machined with internal threads, the external threads engaging with the internal threads to screw the adjusting nut 103 onto the outer cylinder 104. Depending on the specific construction conditions, rotating the adjusting nut 103 adjusts the initial compression of the passive vibration damping component, and also adjusts the initial compressive strain of the active vibration damping component.

[0054] The first spring assembly 201 rests against the adjusting nut 103, and the second spring assembly 202 rests against the partition plate. Rotating the adjusting nut 103 causes it to move toward or away from the first mounting space side, adjusting the initial compression of the passive damping assembly while simultaneously adjusting the initial compressive strain of the active damping assembly.

[0055] The initial compression of the first spring group 201 and the second spring group 202 is applied by rotating the adjusting nut 103. The guide rod 5 connected to the mass block 203 presses against the magnetostrictive rod 303 to form a suitable initial compressive strain, ensuring that the magnetostrictive rod 303 is always in a compressed state during the operation of the entire device. This ensures that the entire vibration damping bracket can operate for a long time and will not fail due to the magnetostrictive rod 303 being in a low-strength tensile state.

[0056] The adjusting nut 103 is stepped, comprising a large-diameter portion and a small-diameter portion. The outer surface of the large-diameter portion has external threads that mate with the internal threads machined at the other end of the outer cylinder 104. The small-diameter portion serves as the drive end, allowing the operator to move the adjusting nut 103 closer to or further away from the first mounting space by rotating the small-diameter portion.

[0057] More specifically, the outer surface of the small-diameter part is provided with anti-slip texture or fitted with a rubber sleeve to increase the friction between the operator's hand and the small-diameter part, thereby playing an anti-slip role.

[0058] In other embodiments, for ease of operation and adjustment, a driven gear is fitted onto the small-diameter portion, and a drive motor is mounted on the outer cylinder 104. A driving gear meshing with the driven gear is mounted on the output shaft of the drive motor. Adjustment is achieved by automatically rotating the adjusting nut 103. Here, both the driven gear and the driving gear are bevel gears.

[0059] The housing assembly also includes a linear bearing 102, with a guide rod 5 at least partially installed in the inner bore of the linear bearing 102 so that the guide rod 5 can move along the axial direction of the linear bearing 102. The center hole of the adjusting nut 103 is a smooth hole, and the housing of the linear bearing 102 is disposed in the smooth hole of the adjusting nut 103.

[0060] The arrangement of the linear bearing 102 serves two purposes: first, it enables the guide rod 5 to undergo rolling friction during its up-and-down movement, resulting in lower frictional resistance; second, the installation of the linear bearing 102 ensures that the guide rod 5, adjusting nut 103, and outer cylinder 104 are arranged axially, thereby making the guide rod 5 coaxial with the active vibration damping assembly, ensuring overall alignment, and thus achieving a better vibration damping effect.

[0061] The vibration damping bracket also includes a limiting sleeve 4. One end of the limiting sleeve 4 is located in the second mounting space and is disposed on the first end plate of the frame 304. The other end of the limiting sleeve 4 extends through the central hole of the partition plate into the first mounting space. The first end of the guide rod 5 passes through the limiting sleeve 4 and is connected to the magnetostrictive rod 303. The setting of the limiting sleeve 4 further ensures the alignment of the guide rod 5 with the housing assembly, the passive vibration damping assembly, and the active vibration damping assembly as a whole.

[0062] The limiting sleeve 4 includes a perforated disc and a cylinder. The cylinder is located at the center of one end face of the perforated disc, and the two are arranged coaxially. The perforated disc is installed in the second installation space and is located on the first end plate of the skeleton 304 of the active control component. The perforated disc cooperates with the base 101 on the housing assembly to limit the axial degree of freedom of the active vibration damping component. The cylinder extends through the center hole of the partition plate on the housing assembly into the first installation space. The cylinder part cooperates with the linear bearing 102 to keep the guide rod 5 from being eccentric during movement. At the same time, the cylinder part also ensures stable vibration transmission and consumption between the first end of the guide rod 5 and the magnetostrictive rod 303.

[0063] The vibration damping support also includes a pipe clamp 6, which is disposed on the second end face of the guide rod 5. The pipe clamp 6 is used to connect the vibration damping support to the piping system.

[0064] Among them, the pipe clamp 6 has a two-part structure, and the two-part pipe clamp 6 is fixed by bolts after being aligned.

[0065] The specific implementation process is as follows: the vibration of the pipe installed on the pipe clamp 6 is transmitted to the vibration damping bracket through the guide rod 5. Part of the vibration is transmitted to the first spring group 201 or the second spring group 202 through the mass block 203. The vibration is consumed by the up and down movement of the mass block 203, which plays the role of energy absorption and vibration reduction. The other part of the vibration acts on the magnetostrictive rod 303. The coil is supplied with alternating current to generate an excitation magnetic field, which interacts with the bias magnetic field generated by the permanent magnet 301 to generate an alternating magnetic field. The magnetostrictive rod 303 expands and contracts under the action of the alternating magnetic field to meet and consume the vibration transmitted by the guide rod 5. Therefore, the magnetostrictive rod 303 achieves vibration control by autonomous expansion and contraction, reducing the vibration transmission from the pipe to the foundation.

[0066] The active-passive composite vibration damping bracket proposed in this application avoids the problems of severe coil heating, complex installation, and poor practical application effect in related technologies during high-frequency output. It also avoids the adverse effects of difficult frequency adjustment, narrow effective bandwidth, and additional vibration-absorbing mass on pipelines found in related technologies. The initial compression of the first spring group 201 and the second spring group 202, as well as the initial compressive strain of the magnetostrictive rod 3, can be changed by adjusting the nut 103 to adapt to the weight of the pipeline and its initial frequency. The alternating current passing through the coil 302 adapts to the changing frequency of the pipeline and reduces the power consumption of active control. The vibration damping bracket of this application has advantages such as strong load-bearing capacity, large output force, small size, and fast response, and is suitable for high-precision, high-load, and multi-frequency range pipeline vibration damping.

[0067] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0068] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A vibration damping bracket, characterized in that, It includes a housing assembly, a passive vibration damping assembly, an active vibration damping assembly, and a guide rod (5); the housing assembly includes a first installation space and a second installation space, the passive vibration damping assembly is disposed in the first installation space, the active vibration damping assembly is disposed in the second installation space, and the guide rod (5) includes a first end and a second end, the first end presses against the active vibration damping assembly, and the second end passes through the passive vibration damping assembly and extends to the outside of the housing assembly; The passive vibration damping assembly includes a mass block (203), a first spring group (201), and a second spring group (202). The mass block (203) includes a first end face and a second end face. The first spring group (201) is disposed on the first end face, and the second spring group (202) is disposed on the second end face. A through hole is provided at the center of the mass block (203), and the guide rod (5) is installed in the through hole so that the mass block (203) moves synchronously with the guide rod (5); The active vibration damping component includes a frame (304), a magnetostrictive rod (303) is disposed in the central hole of the frame (304), the first end of the guide rod (5) is connected to the magnetostrictive rod (303), a coil (302) is mounted on the frame (304), and a permanent magnet (301) is mounted on the coil (302).

2. The vibration damping bracket according to claim 1, characterized in that, The frame (304) includes a cylinder, a first end plate and a second end plate, with the first end plate and the second end plate respectively arranged opposite to each other at both ends of the cylinder.

3. A vibration damping bracket according to claim 2, characterized in that, The housing assembly includes an outer cylinder (104) and a base (101). One end of the outer cylinder (104) is disposed on the base (101). A partition plate is provided on the inner wall of the outer cylinder (104) to divide the inner cavity of the outer cylinder (104) into a first installation space and a second installation space.

4. A vibration damping bracket according to claim 3, characterized in that, The housing assembly also includes an adjusting nut (103), the outer surface of which is at least partially machined with external threads; the other end of the outer cylinder (104) is machined with internal threads, the external threads engaging with the internal threads to screw the adjusting nut (103) onto the outer cylinder (104).

5. A vibration damping bracket according to claim 4, characterized in that, The housing assembly also includes a linear bearing (102), and the guide rod (5) is at least partially installed in the inner hole of the linear bearing (102) so that the guide rod (5) can move along the axial direction of the linear bearing (102). The center hole of the adjusting nut (103) is a smooth hole, and the outer shell of the linear bearing (102) is disposed in the smooth hole of the adjusting nut (103).

6. A vibration damping bracket according to claim 3, characterized in that, The vibration damping bracket also includes a limiting sleeve (4), one end of which is located in the second installation space and is disposed on the first end plate of the frame (304). The other end of the limiting sleeve (4) extends through the center hole of the partition plate into the first installation space. The first end of the guide rod (5) passes through the limiting sleeve (4) and is connected to the magnetostrictive rod (303).

7. A vibration damping bracket according to claim 1, characterized in that, The vibration damping bracket also includes a pipe clamp (6), which is disposed on the second end face of the guide rod (5).

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