Vibration reduction support

Abstract

The invention provides a vibration reduction support. The vibration reduction support comprises a shell assembly, a passive vibration reduction assembly, an active vibration reduction assembly and a guide rod. The shell assembly comprises a first installation space and a second installation space, the passive vibration reduction assembly is arranged in the first installation space, the active vibration reduction assembly is arranged in the second installation space, the guide rod comprises a first end and a second end, the first end abuts against the active vibration reduction assembly, and the second end abuts against the active vibration reduction assembly. The second end penetrates through the passive vibration reduction assembly and extends to the outer side of the shell assembly. The passive vibration reduction assembly is installed in the first installation space of the shell assembly to achieve passive control, the active vibration reduction assembly is installed in the second installation space of the shell assembly to achieve active control, an active and passive composite pipeline vibration reduction support is formed, and the pipeline vibration reduction support has the advantages of being adaptive in frequency modulation, high in precision, large in output force and small in size. The vibration damper has a good vibration damping and restraining effect and is suitable for vibration control of a pipeline system in a ship system.

Description

Technical Field

[0001] The present application belongs to the technical field of pipeline installation, and specifically relates to a vibration-damping bracket. Background Art

[0002] In ship systems, various mechanical equipment are usually connected through pipeline systems to transport water, oil, gas and other related media. When the pipeline system is arranged, the pipeline will be fixed on the foundation wall by supporting or hanging at intervals, and the vibration generated by the pipeline system is mainly transmitted along the medium in the pipeline, the pipe wall and the pipeline support bracket. On the one hand, pipeline vibration affects the normal operation of the pipeline system, shortens the life of pipeline components, and even causes the pipeline joints to loosen, causing fluid leakage and pipeline damage; on the other hand, after the noise of the main and auxiliary power units and propulsion systems of the ship is effectively controlled, the vibration noise of the pipeline system has become the main factor affecting the acoustic performance.

[0003] At present, when controlling pipeline vibration, vibration isolation technologies such as flexible pipes and elastic support structures are often used to reduce the vibration energy in the full frequency band. However, the above vibration control methods are not effective in suppressing vibrations with obvious line spectrum characteristics. Summary of the invention

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

[0005] In order to solve the above problems, the present application provides a vibration damping bracket, including a shell assembly, a passive vibration damping assembly, an active vibration damping assembly and a guide rod; the shell assembly includes a first installation space and a second installation space, the passive vibration damping assembly is arranged in the first installation space, and the active vibration damping assembly is arranged in the second installation space, and the guide rod includes a first end and a second end, the first end is pressed on the active vibration damping assembly, and the second end passes through the passive vibration damping assembly and extends to the outside of the shell assembly.

[0006] Optionally, the passive vibration reduction assembly includes a mass block, a first spring group and a second spring group, the mass block includes a first end surface and a second end surface, the first end surface is provided with the first spring group, and the second end surface is provided with the second spring group.

[0007] Optionally, a through hole is opened 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 reduction component includes a frame, a magnetostrictive rod is arranged in the central hole of the frame, the first end of the guide rod is connected to the magnetostrictive rod, a coil is mounted on the frame, and a permanent magnet is mounted on the coil.

[0009] Optionally, the skeleton includes a cylinder, a first end plate and a second end plate, and the first end plate and the second end plate are arranged opposite to each other at two ends of the cylinder.

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

[0011] Optionally, the shell assembly further includes an adjusting nut, the outer surface of which is at least partially processed with external threads; the other end of the outer cylinder is processed with internal threads, and the external threads cooperate with the internal threads to enable the adjusting nut to be screwed onto the outer cylinder.

[0012] Optionally, the housing assembly also includes a linear bearing, and the guide rod is at least partially installed in the inner hole 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 is a light hole, and the outer shell of the linear bearing is arranged in the light hole of the adjusting nut.

[0013] Optionally, the vibration damping bracket also includes a limiting sleeve, one end of which is located in the second installation space and is arranged on the first end plate of the skeleton, the other end of the limiting sleeve passes through the center hole of the partition plate and extends 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, and the pipe clamp is arranged on the second end surface of the guide rod.

[0015] Beneficial Effects

[0016] 1. The vibration reduction bracket provided in the embodiment of the present invention has a passive vibration reduction component installed in the first installation space of the shell component to realize passive control, and an active vibration reduction component installed in the second installation space of the shell component to realize active control, forming an active and passive composite pipeline vibration reduction bracket, which has the characteristics of adaptive frequency modulation, high precision, large output force and small size. It has a good vibration reduction 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 embodiment of the present invention adopts a magnetostrictive rod with the advantages of good frequency adaptability, wide working frequency band, high precision, and large output force, thereby avoiding the adverse effect of the additional mass of the vibration absorber in the related art on the pipeline. The vibration-damping bracket of the present application has a strong bearing capacity, and 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 bearing weight and pipeline frequency. The vibration-damping bracket is easy to adjust and has stronger applicability.

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

[0019] 4. The vibration reduction bracket provided in the embodiment of the present invention is an active and passive composite vibration reduction bracket formed by a passive vibration reduction component and an active vibration reduction component. There is no need to build an additional support structure for the vibration reduction bracket, and it is not limited by installation and space size in actual application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a vibration-damping bracket according to an embodiment of the present application.

[0021] The reference numerals are:

[0022] 101-base; 102-linear bearing; 103-adjusting nut; 104-cylinder;

[0023] 201-first spring group; 202-second spring group; 203-mass block;

[0024] 301-annular permanent magnet; 302-coil; 303-magnetostrictive rod; 304-skeleton;

[0025] 4-limit sleeve;

[0026] 5-Guide rod;

[0027] 6-Pipe clamp. DETAILED DESCRIPTION

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] See also Figure 1 As shown, a vibration damping bracket provided according to an embodiment of the present application includes a shell assembly, a passive vibration damping assembly, an active vibration damping assembly and a guide rod 5; the shell assembly includes a first installation space and a second installation space, the passive vibration damping assembly is arranged in the first installation space, and the active vibration damping assembly is arranged in the second installation space, the guide rod 5 includes a first end and a second end, the first end is pressed on the active vibration damping assembly, and the second end passes through the passive vibration damping assembly and extends to the outside of the shell assembly.

[0033] A passive vibration reduction component is installed in the first installation space of the shell component to realize passive control, and an active vibration reduction component is installed in the second installation space of the shell component to realize active control, forming an active and passive composite pipeline vibration reduction bracket, which has the characteristics of 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 reduction 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 surface and a second end surface. The first end surface is provided with the first spring group 201, and the second end surface is provided with the second spring group 202.

[0035] In a 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 with the guide rod 5, thereby consuming part of the vibration. At the same time, since the passive vibration reduction component consumes part of the vibration, the problem of serious heating of the active vibration reduction component when actively controlling high-frequency vibration is avoided.

[0036] In this embodiment, the first spring group 201 and the second spring group 202 are both composed of two springs; in other embodiments, the specific number of springs can be adjusted according to 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. The guide rod 5 can transmit vibration to the mass block 203, and at the same time, the mass block 203 also drives the guide rod 5 to move together during the energy dissipation and vibration reduction process, and presses the active vibration reduction component, so that the vibration reduction bracket has better high-frequency output characteristics.

[0038] The guide rod 5 and the mass block 203 are tightly matched, that is, when the guide rod 5 follows the mass block 203 to move up and down, the position between the guide rod 5 and the mass block 203 is fixed, thereby ensuring the uniqueness of the movement of the two.

[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 may 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 reduction assembly includes a skeleton 304 , a magnetostrictive rod 303 is arranged in the central hole of the skeleton 304 , a first end of the guide rod 5 presses against the end of the magnetostrictive rod 303 , a coil 302 is mounted on the skeleton 304 , and a permanent magnet 301 is mounted on the coil 302 .

[0041] When the coil 302 is connected to an 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 reduction 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 is extended; 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 is shortened. Therefore, the magnetostrictive rod 303 is autonomously extended and retracted under the action of the alternating magnetic field to achieve the purpose of vibration control. At the same time, the excitation magnetic field intensity can be changed by changing the magnitude of the alternating current in the coil to control the extension amount of the magnetostrictive rod 303.

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

[0044] The permanent magnet 301 is made of materials such as NdFeB with high magnetic energy product, which can greatly 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 a small space.

[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 adjustment 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 size, weight, and vibration characteristic line spectrum) to achieve active and passive hybrid vibration reduction based on magnetostrictive drive.

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

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

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

[0049] The shell assembly includes an outer cylinder 104 and a base 101. One end of the outer cylinder 104 is arranged on the base 101. A partition plate is arranged 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. The passive vibration reduction assembly and the active vibration reduction assembly are supported and installed by the arrangement of the partition plate.

[0050] A boss is provided at the center of the base 101 , and the bottom end of the cylinder on the frame 304 is sleeved on the boss to ensure that the active vibration reduction component is coaxial with the shell component when installed.

[0051] The base 101 is provided with mounting holes on its sides to facilitate fixing the vibration-damping bracket on 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 and reduce magnetic leakage.

[0053] The housing assembly also includes an adjusting nut 103, at least part of which is processed with an external thread on its outer surface; the other end of the outer cylinder 104 is processed with an internal thread, and the external thread cooperates with the internal thread so that the adjusting nut 103 is screwed onto the outer cylinder 104. According to specific construction conditions, the initial compression of the passive vibration reduction assembly is adjusted by rotating the adjusting nut 103, and the initial compressive strain of the active vibration reduction assembly is also adjusted.

[0054] The first spring group 201 abuts against the adjusting nut 103, and the second spring group 202 abuts against the partition plate. The adjusting nut 103 is rotated to move the adjusting nut 103 toward or away from the first installation space side, thereby adjusting the initial compression amount of the passive vibration reduction component and the initial compressive strain of the active vibration reduction component.

[0055] The initial compression amount of the first spring group 201 and the second spring group 202 is applied by rotating the adjusting nut 103, and the magnetostrictive rod 303 is pressed by the guide rod 5 connected to the mass block 203 to form a suitable initial compressive strain, so that the magnetostrictive rod 303 of the entire device is always in a compressed state during the working process, which ensures that the entire vibration reduction bracket can operate for a long time, and does not cause the active vibration reduction component to fail due to the magnetostrictive rod 303 being in a low-intensity tensile state.

[0056] The adjusting nut 103 is stepped, including a large diameter portion and a small diameter portion, and an external thread is processed on the outer circumferential surface of the large diameter portion, which cooperates with the internal thread processed on the other end of the outer cylinder 104. The small diameter portion is used as a driving end, and the operator rotates the small diameter portion to move the adjusting nut 103 toward or away from the first installation space.

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

[0058] In other embodiments, in order to facilitate operation and adjustment, a driven gear is mounted on the small diameter portion, a driving motor is mounted on the outer cylinder 104, and a driving gear meshing with the driven gear is mounted on the output shaft of the driving motor. The adjustment nut 103 is rotated by automatic control to make adjustments. Here, the driven gear and the driving gear are bevel gears.

[0059] 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 light hole, and the outer shell of the linear bearing 102 is arranged in the light hole of the adjusting nut 103.

[0060] Through the arrangement of the linear bearing 102, firstly, the up and down movement of the guide rod 5 is rolling friction, so that the friction resistance is smaller; secondly, through the installation of the linear bearing 102, the guide rod 5, the adjusting nut 103 and the outer cylinder 104 are arranged on the central axis, and then the guide rod 5 and the active vibration reduction assembly are coaxial, ensuring the overall concentricity, thereby achieving a better vibration reduction effect.

[0061] The vibration-damping bracket further includes a limiting sleeve 4, one end of which is located in the second installation space and is arranged on the first end plate of the frame 304, the other end of which passes through the central hole of the partition plate and extends into the first installation space, and 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 overall centering of the guide rod 5 and the housing assembly, the passive vibration damping assembly and the active vibration damping assembly.

[0062] Among them, the limiting sleeve 4 includes a perforated disc and a cylinder, the cylinder is arranged at the center of one of the end faces of the perforated disc, and the two are coaxially arranged; 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, and the perforated disc cooperates with the base 101 on the shell component to limit the axial freedom of the active vibration reduction component; the cylinder extends into the first installation space through the center hole of the partition plate on the shell component, and the cylindrical part cooperates with the linear bearing 102 to keep the guide rod 5 from being eccentric during movement, and the cylindrical part also ensures stable vibration transmission consumption between the first end of the guide rod 5 and the magnetostrictive rod 303.

[0063] The vibration-damping bracket further comprises a pipe clamp 6, which is arranged on the second end surface of the guide rod 5. The pipe clamp 6 is used to realize the connection between the vibration-damping bracket and the pipeline system.

[0064] The pipe clamp 6 is a two-piece structure, and the two-piece pipe clamp 6 is fixed by bolt connection after being centered.

[0065] The specific implementation process is as follows: the vibration of the pipeline installed on the pipe clamp 6 is transmitted to the vibration reduction bracket through the guide rod 5, and a part of the vibration is transmitted to the first spring group 201 or the first spring group 202 through the mass block 203, and the vibration is consumed by the up and down movement of the mass block 203, which plays a role in energy absorption and vibration reduction; the other part of the vibration acts on the magnetostrictive rod 303, and the coil is passed through an alternating current to generate an excitation magnetic field, and interacts with the bias magnetic field generated by the permanent magnet 301 to generate an alternating magnetic field. The magnetostrictive rod 303 is extended and retracted 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 extension and retraction, thereby reducing the vibration transmission from the pipeline to the foundation.

[0066] The active and passive composite vibration reduction bracket proposed in this application avoids the problems of serious coil heating during high-frequency output, complex installation, and poor practical application effect in the related art, and at the same time avoids the adverse effects of the difficult frequency adjustment, narrow effective frequency band, and additional vibration absorption mass on the pipeline in the related art. The initial compression of the first spring group 201 and the second spring group 202 and the initial compressive strain of the magnetostrictive rod 3 can be changed by adjusting the nut 103 to adapt to the weight of the bearing pipeline and the initial frequency of the pipeline; the alternating current passing through the coil 302 adapts to the changing frequency of the pipeline and can reduce the power consumption of active control; the vibration reduction bracket of this application has the advantages of strong bearing capacity, large output force, small size, and fast response, and is suitable for high-precision, large-load, and multi-frequency range pipeline vibration reduction.

[0067] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0068] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A vibration-damping bracket, characterized in that: The invention comprises a shell component, a passive vibration reduction component, an active vibration reduction component and a guide rod (5); the shell component comprises a first installation space and a second installation space, the passive vibration reduction component is arranged in the first installation space, the active vibration reduction component is arranged in the second installation space, and the guide rod (5) comprises a first end and a second end, the first end presses on the active vibration reduction component, and the second end passes through the passive vibration reduction component and extends to the outside of the shell component.

2. A vibration-damping bracket according to claim 1, characterized in that: The passive vibration reduction component comprises a mass block (203), a first spring group (201) and a second spring group (202); the mass block (203) comprises a first end surface and a second end surface; the first end surface is provided with the first spring group (201) and the second end surface is provided with the second spring group (202).

3. A vibration-damping bracket according to claim 2, characterized in that: 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).

4. A vibration-damping bracket according to claim 1, characterized in that: The active vibration reduction component comprises a frame (304), a magnetostrictive rod (303) is arranged in a central hole of the frame (304), a 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).

5. A vibration-damping bracket according to claim 4, characterized in that: The frame (304) comprises a cylinder, a first end plate and a second end plate, and the first end plate and the second end plate are arranged opposite to each other at two ends of the cylinder.

6. The vibration-damping bracket according to claim 1, characterized in that: The shell assembly comprises an outer cylinder (104) and a base (101); one end of the outer cylinder (104) is arranged on the base (101); and a partition plate is arranged on the inner wall of the outer cylinder (104) to divide the inner cavity of the outer cylinder (104) into the first installation space and the second installation space.

7. A vibration-damping bracket according to claim 6, characterized in that: The housing assembly further comprises an adjusting nut (103), the outer surface of which is at least partially processed with an external thread; the other end of the outer cylinder (104) is processed with an internal thread, the external thread cooperates with the internal thread so that the adjusting nut (103) is screwed onto the outer cylinder (104).

8. The vibration-damping bracket according to claim 7, characterized in that: The housing assembly further comprises a linear bearing (102), the guide rod (5) being at least partially mounted 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 central hole of the adjusting nut (103) being a light hole, and the outer shell of the linear bearing (102) being arranged in the light hole of the adjusting nut (103).

9. The vibration-damping bracket according to claim 1, characterized in that: The vibration-damping bracket further comprises a limiting sleeve (4), one end of which is located in the second installation space and is arranged on the first end plate of the frame (304), the other end of which passes through the central hole of the partition plate and extends into the first installation space, and the first end of the guide rod (5) passes through the limiting sleeve (4) and is connected to the magnetostrictive rod (303).

10. The vibration-damping bracket according to claim 1, characterized in that: The vibration-damping bracket also includes a pipe clamp (6), and the pipe clamp (6) is arranged on the second end surface of the guide rod (5).

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