An active dynamic vibration absorber for pipelines

Abstract

This invention specifically relates to an active dynamic vibration absorber for pipelines, comprising a housing and, inside the housing, an excitation coil, a mass magnet, a fixed iron core, a metal rubber, and a pipe clamp. The pipe clamp extends through the interior of the housing, with both ends protruding outside. The pipe clamp is installed on the pipeline, and symmetrical metal rubber is mounted on the pipe clamp. A mass magnet is mounted on the metal rubber, and symmetrical mass magnets are mounted on the mass blocks. The fixed iron core is symmetrically mounted on the inner wall of the housing along three directions of the mass blocks, and the excitation coil is mounted on the fixed iron core. The two ends of the excitation coil pass through the housing and are connected to an external control device, which controls the magnitude of the current flowing through the excitation coil. This active dynamic vibration absorber has a simple structure, is easy to maintain, and does not produce leakage or pollution; it achieves multi-directional vibration absorption for pipelines, meeting multi-directional vibration absorption requirements; and it ensures long-term stable operation of the pipeline.

Description

Technical Field

[0001] This invention relates to the field of pipeline vibration reduction technology, and in particular to an active dynamic vibration absorber for pipelines. Background Technology

[0002] Pipelines are used in many fields, primarily for fluid transportation, and play an indispensable role in the operation of mechanical devices. Vibration is inevitable during pipeline operation. This vibration arises from two sources: the flow and pressure pulsations within the pipeline itself, and vibrations transmitted to the pipeline from connected power equipment. Severe vibration can lead to loosening of pipeline connections, fatigue wear, reduced pipeline lifespan, and even breakage. Therefore, employing effective methods to reduce pipeline vibration levels is of significant engineering importance.

[0003] Currently, pipelines are mainly fixed using rubber blocks or rigid clamps. Although rubber blocks have a vibration damping effect, they are subject to high operating temperature requirements and have a short lifespan, requiring frequent replacement. Rigid clamps, on the other hand, have no vibration damping effect.

[0004] For vibration control in pipelines, using dynamic vibration absorbers is a feasible method. Currently, most dynamic vibration absorbers used in pipelines are passive dynamic vibration absorbers with a fixed absorption frequency. Due to the uncertainty of fluid flow inside the pipeline and the non-constant operating frequency of the power equipment connected to the pipeline, the excitation frequency of the pipeline is not constant. Even a slight deviation between the excitation frequency of the pipeline and the absorption frequency of the passive dynamic vibration absorber will significantly reduce its vibration absorption capacity. Therefore, passive dynamic vibration absorbers need to be designed with different masses for different pipeline absorption frequencies.

[0005] Active dynamic vibration absorbers can adaptively adjust the absorption frequency to match the excitation frequency of the pipeline. However, most active dynamic vibration absorbers currently used in pipelines change their mass by adding or removing internal liquid to achieve frequency modulation. This results in complex structures, a tendency to leak and cause pollution, and the fact that most active dynamic vibration absorbers used in pipelines can only achieve unidirectional vibration absorption, while pipeline vibration is multidirectional. Summary of the Invention

[0006] One of the objectives of this invention is to provide an active dynamic vibration absorber for pipelines, which solves the problems of complex structure and easy leakage and pollution of existing active dynamic vibration absorbers. Its structure is simple, easy to maintain, and will not cause leakage and pollution.

[0007] The second objective of this invention is to provide an active dynamic vibration absorber for pipelines, which solves the problem that existing active dynamic vibration absorbers for pipelines can only achieve unidirectional vibration absorption and do not meet the multidirectional vibration absorption requirements of pipelines, thereby achieving multidirectional vibration absorption of pipelines and meeting the multidirectional vibration absorption requirements of pipelines.

[0008] The present invention provides an active dynamic vibration absorber for pipelines, ensuring that pipelines can operate stably for a long period of time.

[0009] To address the above problems, the present invention provides the following technical solution:

[0010] An active dynamic vibration absorber for pipelines includes a housing and an excitation coil, a mass magnet, a fixed iron core, a mass block, a metal rubber, and a pipe clamp installed inside the housing. The pipe clamp extends through the interior of the housing and its two ends extend outside the housing. The pipe clamp is installed on the pipeline, and metal rubber is symmetrically mounted on the pipe clamp. A mass block is mounted on the metal rubber, and a mass magnet is symmetrically mounted on the mass block. The fixed iron core is symmetrically mounted on the inner wall of the housing along three directions of the mass block, and the excitation coil is mounted on the fixed iron core. The two ends of the excitation coil pass through the housing and are connected to an external control device, which controls the magnitude of the current flowing through the excitation coil. The mass block and the metal rubber constitute a dynamic vibration absorption structure. The excitation coil, the mass magnet, and the fixed iron core constitute a stiffness control structure to control the stiffness of the mass block in three directions.

[0011] The working principle of the active dynamic vibration absorber of the present invention is as follows: when the pipeline is subjected to load excitation, the mass block and the metal rubber, as a dynamic vibration absorption structure, will vibrate with the load excitation of the pipeline, thereby transferring the load excitation of the pipeline to the mass block and the metal rubber.

[0012] Stiffness adjustment structures are arranged in three directions of the mass block. The excitation coil is energized to magnetize the fixed iron core, so that the fixed iron core generates a magnetic repulsion force on the mass block magnet, thereby realizing independent control of the stiffness of the mass block in three directions. By controlling the stiffness of the mass block in three directions, the vibration absorption frequency of the mass block is changed. Combined with the damping effect generated by the friction and extrusion between the metal wires inside the metal rubber, a dual vibration absorption effect in three directions of the pipeline is achieved.

[0013] By changing the current flowing through the excitation coil, the magnitude of the magnetic field of the fixed iron core is altered, which in turn changes the magnetic repulsion force on the magnet of the mass block, thereby changing the stiffness of the mass block and ultimately altering its vibration absorption frequency, thus achieving an active vibration absorption effect in the pipeline.

[0014] As one possible implementation method, the mass block has three directions: two radial directions that are perpendicular to each other of the pipe, and the axial direction of the pipe that is perpendicular to the two radial directions that are perpendicular to each other of the pipe.

[0015] As one possible method, pipe clamp bolts are installed on the pipe.

[0016] As one possible implementation, the lower surface of the mass block is provided with a first groove, and the upper surface of the pipe clamp is provided with a second groove; the upper surface of the metal rubber is adhered and installed in the first groove, and the lower surface of the metal rubber is adhered and installed in the second groove.

[0017] As one possible approach, the mass block is bolted onto the mass block.

[0018] As one possible approach, the inner wall of the housing is provided with a third groove, and the fixing core bolts are installed in the third groove of the inner wall of the housing.

[0019] As one possible method, the excitation coil is wound and mounted on a fixed iron core.

[0020] One possible approach is to have through holes in the housing for the excitation coil to pass through.

[0021] As one possible implementation, the outer shell is formed by bolting two half-shells together, and the pipe clamp is formed by bolting two half-pipe clamps together.

[0022] As one possible implementation, two mass magnets on a mass block are respectively opposite to two fixed iron cores above the mass block along the axial direction of the pipe; one mass magnet on a mass block is opposite to a fixed iron core above the mass block along the radial direction of the pipe.

[0023] Beneficial technical effects of the present invention:

[0024] The present invention provides an active dynamic vibration absorber for pipelines, in which a mass block and a metal rubber work together as a dynamic vibration absorption structure to achieve a dual vibration absorption effect for pipelines.

[0025] The active dynamic vibration absorber for pipelines of the present invention has stiffness adjustment structures arranged in three directions of the mass block to achieve independent control of the stiffness of the mass block in three directions; by controlling the stiffness of the mass block in three directions respectively, the vibration absorption frequency of the mass block is changed, and combined with the damping effect generated by the friction and extrusion between the metal wires inside the metal rubber, a dual vibration absorption effect in three directions of the pipeline is achieved.

[0026] The active dynamic vibration absorber for pipelines of the present invention changes the magnitude of the magnetic field of the fixed iron core by changing the magnitude of the current flowing through the excitation coil, thereby changing the magnetic repulsion force on the magnet of the mass block, thus changing the stiffness of the mass block, and thus changing the vibration absorption frequency of the mass block, thereby achieving an active vibration absorption effect for the pipeline.

[0027] The active dynamic vibration absorber for pipelines of the present invention has a simple structure, is easy to maintain, and will not cause leakage or pollution; there are no mechanical linkages in the structure, enabling reliable operation in harsh environments; and ensuring that pipelines can operate stably for a long time. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the external shape of an embodiment of the active dynamic vibration absorber for pipelines according to the present invention;

[0029] Figure 2 An internal perspective view of an embodiment of the active dynamic vibration absorber for pipelines according to the present invention;

[0030] Figure 3 This is a schematic diagram of the internal structure of an embodiment of the active dynamic vibration absorber for pipelines according to the present invention;

[0031] Figure 4 This is an internal front view of an embodiment of the active dynamic vibration absorber for pipelines according to the present invention;

[0032] Figure 5 This is a side view of one embodiment of the active dynamic vibration absorber for pipelines according to the present invention;

[0033] Figure 6 This is a partial lateral cross-sectional view of one embodiment of the active dynamic vibration absorber for pipelines according to the present invention;

[0034] Figure 7 A schematic diagram of the structure of one embodiment of the mass block;

[0035] Figure 8 This is a schematic diagram of one embodiment of the pipe clamp.

[0036] In the diagram, 1 is the outer casing; 2 is the excitation coil; 3 is the mass block magnet; 4 is the fixed iron core; 5 is the mass block; 6 is the metal rubber; 7 is the pipe clamp; 101 is the third groove; 102 is the through hole; 501 is the first groove; and 701 is the second groove. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "left end", "right end", "above", "below", "inner side", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention.

[0039] In this invention, unless otherwise explicitly 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.

[0040] See Figure 1-8 This embodiment provides an active dynamic vibration absorber for pipelines, including a housing 1 and an excitation coil 2, a mass magnet 3, a fixed iron core 4, a mass block 5, a metal rubber 6, and a pipe clamp 7 installed inside the housing 1. The pipe clamp 7 passes through the interior of the housing 1 and extends out of the housing 1 at both ends. The pipe clamp 7 is installed on the pipeline, and the metal rubber 6 is symmetrically installed on the pipe clamp 7. The mass block 5 is installed on the metal rubber 6, and the mass magnet 3 is symmetrically installed on the mass block 5. The fixed iron core 4 is symmetrically installed on the inner wall of the housing 1 along the three directions of the mass block 5, and the excitation coil 2 is installed on the fixed iron core 4. The two ends of the excitation coil 2 pass through the housing 1 and are connected to an external control device, which controls the magnitude of the current flowing through the excitation coil 2. The mass block 5 and the metal rubber 6 constitute a dynamic vibration absorption structure. The excitation coil 2, the mass magnet 3, and the fixed iron core 4 constitute a stiffness control structure to control the stiffness of the mass block 5 in the three directions.

[0041] The working principle of the active dynamic vibration absorber in this embodiment is as follows: When the pipeline is subjected to load excitation, the mass block 5 and the metal rubber 6, as a dynamic vibration absorption structure, will vibrate with the load excitation of the pipeline, thereby transferring the load excitation of the pipeline to the mass block 5 and the metal rubber 6.

[0042] Stiffness adjustment structures are arranged in three directions for the mass block 5. The excitation coil 2 is energized to magnetize the fixed iron core 4, so that the fixed iron core 4 generates a magnetic repulsive force on the mass block magnet 3 on the mass block 5, thereby realizing independent control of the stiffness of the mass block 5 in three directions. By controlling the stiffness of the mass block 5 in three directions, the vibration absorption frequency of the mass block 5 is changed. Combined with the damping effect generated by the friction and extrusion between the metal wires inside the metal rubber 6, a dual vibration absorption effect in three directions of the pipeline is achieved.

[0043] By changing the magnitude of the current flowing through the excitation coil 2, the magnitude of the magnetic field of the fixed iron core 4 is changed, which in turn changes the magnetic repulsion force on the mass block magnet 3 on the mass block 5, thereby changing the stiffness of the mass block 5, and thus changing the vibration absorption frequency of the mass block 5, achieving the active vibration absorption effect of the pipeline.

[0044] In this embodiment, as one possible implementation method, the three directions of the mass block 5 are two radial directions that are perpendicular to each other of the pipe and the axial direction of the pipe that is perpendicular to the two radial directions that are perpendicular to each other of the pipe.

[0045] In this embodiment, as one possible approach, the pipe clamp 7 is bolted onto the pipe.

[0046] In this embodiment, as one possible approach, the lower surface of the mass block 5 is provided with a first groove 501, and the upper surface of the pipe clamp 7 is provided with a second groove 701; the upper surface of the metal rubber 6 is adhered to and installed in the first groove 501, and the lower surface of the metal rubber 6 is adhered to and installed in the second groove 701.

[0047] In this embodiment, as one possible approach, the mass block magnet 3 is bolted onto the mass block 5.

[0048] In this embodiment, as one possible approach, the inner wall of the outer casing 1 is provided with a third groove 101, and the fixing core 4 is bolted and installed in the third groove 101 on the inner wall of the outer casing 1.

[0049] In this embodiment, as one possible approach, the excitation coil 2 is wound and mounted on the fixed iron core 4, and both ends of the excitation coil 2 pass through the outer shell 1 and are connected to the external control device.

[0050] In this embodiment, as one possible approach, the outer casing 1 is provided with a through hole 102 for the excitation coil 2 to pass through.

[0051] In this embodiment, as one possible implementation, the outer shell 1 is formed by bolting two half-shells together, and the pipe clamp 7 is formed by bolting two half-pipe clamps together.

[0052] In this embodiment, as one possible approach, two mass block magnets 3 on a mass block 5 are respectively opposite to two fixed iron cores 4 above the mass block 5 along the axial direction of the pipe; one mass block magnet 3 on a mass block 5 is opposite to one fixed iron core 4 above the mass block 5 along the radial direction of the pipe.

[0053] In this embodiment, the active dynamic vibration absorber for pipelines uses mass block 5 and metal rubber 6 together as a dynamic vibration absorption structure to achieve a dual vibration absorption effect for the pipeline.

[0054] The active dynamic vibration absorber for pipelines in this embodiment has stiffness adjustment structures arranged in three directions for the mass block 5, so as to achieve independent control of the stiffness of the mass block 5 in three directions. By controlling the stiffness of the mass block 5 in three directions, the vibration absorption frequency of the mass block 5 is changed. Combined with the damping effect generated by the friction and extrusion between the metal wires inside the metal rubber 6, a dual vibration absorption effect in three directions of the pipeline is achieved.

[0055] The active dynamic vibration absorber for pipelines in this embodiment changes the magnitude of the magnetic field of the fixed iron core 4 by changing the magnitude of the current flowing through the excitation coil 2, thereby changing the magnetic repulsion force on the mass block magnet 3 on the mass block 5, thus changing the stiffness of the mass block 5, and thus changing the vibration absorption frequency of the mass block 5, thereby achieving the active vibration absorption effect of the pipeline.

[0056] The active dynamic vibration absorber for pipelines in this embodiment has a simple structure, is easy to maintain, and will not cause leakage or pollution; there are no mechanical linkages in the structure, enabling reliable operation in harsh environments; and ensuring that the pipeline can operate stably for a long time.

[0057] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An active dynamic vibration absorber for pipelines, characterized in that, The device includes an outer shell (1) and an excitation coil (2), a mass magnet (3), a fixed iron core (4), a mass block (5), a metal rubber (6), and a pipe clamp (7) installed inside the outer shell (1). The pipe clamp (7) passes through the inside of the outer shell (1) and extends out of the outer shell (1) at both ends. The pipe clamp (7) is installed on a pipeline. The metal rubber (6) is symmetrically installed on the pipe clamp (7). The mass block (5) is installed on the metal rubber (6). The mass magnet (3) is symmetrically installed on the mass block (5). The fixed iron core (4) is symmetrically installed on the inner wall of the outer shell (1) along the three directions of the mass block (5). An excitation coil (2) is installed on a fixed iron core (4); the two ends of the excitation coil (2) pass through the outer shell (1) and are connected to an external control device, which controls the magnitude of the current flowing through the excitation coil (2); the mass block (5) and the metal rubber (6) constitute a dynamic vibration absorption structure; the excitation coil (2), the mass block magnet (3) and the fixed iron core (4) constitute a stiffness control structure, which controls the stiffness of the mass block (5) in three directions; the three directions of the mass block (5) are two radial directions perpendicular to each other and the axial directions of the pipe that are perpendicular to the two radial directions perpendicular to each other.

2. The active dynamic vibration absorber according to claim 1, characterized in that, Pipe clamps (7) are bolted onto the pipe.

3. The active dynamic vibration absorber according to claim 1, characterized in that, The lower surface of the mass block (5) is provided with a first groove (501), and the upper surface of the pipe clamp (7) is provided with a second groove (701); the upper surface of the metal rubber (6) is adhered to the first groove (501), and the lower surface of the metal rubber (6) is adhered to the second groove (701).

4. The active dynamic vibration absorber according to claim 1, characterized in that, The mass block magnet (3) is bolted onto the mass block (5).

5. The active dynamic vibration absorber according to claim 1, characterized in that, The inner wall of the outer shell (1) is provided with a third groove (101), and the fixing iron core (4) bolt is installed in the third groove (101) on the inner wall of the outer shell (1).

6. The active dynamic vibration absorber according to claim 1, characterized in that, The excitation coil (2) is wound and installed on the fixed iron core (4).

7. The active dynamic vibration absorber according to claim 1, characterized in that, The outer casing (1) has a through hole (102) for the excitation coil (2) to pass through.

8. The active dynamic vibration absorber according to claim 1, characterized in that, The outer shell (1) is formed by bolting two half-shells together, and the pipe clamp (7) is formed by bolting two half-pipe clamps together.

9. The active dynamic vibration absorber according to claim 1, characterized in that, Two mass magnets (3) on a mass block (5) are respectively opposite to two fixed iron cores (4) above the mass block (5) along the axial direction of the pipe; one mass magnet (3) on a mass block (5) is opposite to one fixed iron core (4) above the mass block (5) along the radial direction of the pipe.

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