Pipeline supporting vibration isolation device with adjustable bearing capacity and vibration isolation frequency

Abstract

The invention relates to the technical field of vibration reduction equipment, and provides a pipeline supporting vibration isolation device with adjustable bearing capacity and vibration isolation frequency, which comprises a frame, a clamp, a first elastic piece and a pair of rigidity adjusting mechanisms, the clamp is used for fixing a pipeline, the two opposite ends of the clamp are slidably connected with the side walls of the frame correspondingly, the clamp is provided with a protruding block, the protruding block is connected with the bottom face of the frame through a first elastic piece, and the rigidity adjusting mechanisms are arranged on the two sides of the protruding block correspondingly; the rigidity adjusting mechanism comprises a box body and a second elastic piece, the box body is slidably connected with the side wall of the frame, the second elastic piece is arranged in the box body, one end of the second elastic piece penetrates through the box body to be connected with the protruding block, and the second elastic piece is in a compressed state. According to the pipeline supporting and vibration isolating device with the adjustable bearing capacity and vibration isolating frequency, by means of the combination of the positive stiffness and the negative stiffness, it can be guaranteed that the pipeline supporting and vibration isolating device has a large static stiffness value and a small dynamic stiffness value, and low-frequency vibration is isolated while the effective supporting effect is provided.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction equipment, and in particular to a pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency. Background Art

[0002] The piping system is a key component of a ship. Its core function is to transfer energy flow, momentum flow or mass flow, and it is an important guarantee for the normal operation of the ship. However, the piping system is also an important way to transmit vibration. The vibration generated by mechanical equipment can be transmitted to the ship structure through the piping system. With the continuous development of the shipping industry, the complexity of ships and the power of power systems are increasing. The vibration problem has become increasingly prominent and has become one of the important factors restricting the improvement of ship performance.

[0003] Severe vibration of the piping system can lead to a series of serious consequences. Vibration may cause fatigue damage to the pipeline, which in turn causes the working fluid in the pipe to leak. Once the working fluid leaks, it will not only cause economic losses, but also may cause safety accidents such as fire and explosion, posing a serious threat to the service life and safety of the ship. In addition, the vibration of the piping system will also have a negative impact on the work, life and physical health of the crew, such as causing seasickness, fatigue and even long-term health problems, reducing the crew's work efficiency and quality of life.

[0004] In order to deal with the vibration problem of the pipeline system, pipeline support devices are widely used. The main function of the pipeline support device is to support and fix the pipeline, limit the displacement and deformation of the pipeline, and bear the static load and dynamic load transmitted from the pipeline. In addition, the pipeline support device also undertakes the important task of vibration isolation. As an important part of the pipeline support device, the vibration isolation effect of the vibration isolator is closely related to the natural frequency. Generally speaking, the lower the natural frequency of the vibration isolator, the better the vibration isolation effect. However, traditional vibration isolators only have a certain vibration reduction effect on high-frequency vibrations, and their isolation ability for low-frequency vibrations is poor. This is because the frequency of low-frequency vibrations is close to the natural frequency of the ship structure, which is easy to cause resonance and further aggravate the vibration problem.

[0005] Further analysis found that the stiffness of the vibration isolator has a direct impact on its natural frequency and vibration isolation performance. The lower the stiffness of the vibration isolator, the lower its natural frequency, and the better the vibration isolation effect in theory. However, low-stiffness vibration isolators have obvious limitations in practical applications. Low stiffness will cause the vibration isolator to deform significantly when subjected to static loads, causing the static stiffness performance of the vibration isolator to deteriorate. This performance degradation will not only affect the stability of the piping system, but may also cause the vibration isolator to fail during long-term use.

[0006] Therefore, there is an irreconcilable contradiction between the vibration isolation and support performance of the current pipeline support device. In order to take into account both the vibration isolation and support functions, it is urgent to invent a new pipeline support vibration isolation device to effectively solve the problems existing in the existing technology and improve the reliability and safety of the ship pipeline system. Summary of the invention

[0007] The present invention provides a pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency, so as to solve the defect that the pipeline support device in the prior art cannot have both vibration isolation and support performances.

[0008] The present invention provides a pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency, comprising: a frame, a clamp, a first elastic member and a pair of stiffness adjustment mechanisms; the clamp is used to fix the pipeline, the opposite ends of the clamp are respectively slidably connected to the side walls of the frame, the clamp is provided with a protrusion, the protrusion is connected to the bottom surface of the frame through the first elastic member, and a pair of stiffness adjustment mechanisms are respectively arranged on both sides of the protrusion; each of the stiffness adjustment mechanisms comprises: a box body and a second elastic member, the box body is slidably connected to the side wall of the frame, the second elastic member is arranged in the box body, one end of the second elastic member passes through the box body and is connected to the protrusion, wherein the second elastic member is in a compressed state.

[0009] According to a pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency provided by the present invention, each of the stiffness adjustment mechanisms also includes a first telescopic structure, which is arranged in the box body and connected to the second elastic member, and the first telescopic structure is used to adjust the pre-compression amount of the second elastic member.

[0010] According to the present invention, a pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency also includes a pair of second telescopic structures, and the two ends of each of the second telescopic structures are respectively connected to the bottom surface of the box body and the frame, and the second telescopic structure is used to drive the box body to move along the elastic force direction of the first elastic member.

[0011] According to the present invention, a pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency also includes: a plurality of vibration acceleration sensors and a controller, wherein the plurality of vibration acceleration sensors are respectively arranged on the clamp and the frame, and the controller is used to control the movement amount of the first telescopic structure and the second telescopic structure according to the vibration acceleration signal sent by the vibration acceleration sensor.

[0012] According to a pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency provided by the present invention, the first telescopic structure includes: a first driver and a first telescopic member, the first driver and the first telescopic member are arranged in the box body; the first driver is connected to the first telescopic member, and the first telescopic member is connected to the second elastic member, and the first driver can drive the first telescopic member to extend and retract when moving, so as to adjust the pre-compression amount of the second elastic member.

[0013] According to a pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency provided by the present invention, each of the stiffness adjustment mechanisms also includes a first baffle; the first baffle is arranged between the first telescopic member and the second elastic member, the first baffle is connected to the first telescopic member, and can move under the action of the first telescopic member, and the second elastic member abuts against the first baffle.

[0014] According to a pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency provided by the present invention, each of the stiffness adjustment mechanisms further includes a connecting rod, and two ends of the connecting rod are respectively connected to the protrusion and the second elastic member.

[0015] According to a pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency provided by the present invention, each of the second telescopic structures includes: a second driver and a second telescopic member, the second driver is connected to the bottom surface of the frame, the two ends of the second telescopic member are respectively connected to the second driver and the box body, and the second driver can drive the second telescopic member to extend and retract when moving, so as to drive the box body to move.

[0016] According to the present invention, a pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency also includes a plurality of metal damping blocks. The metal damping blocks are arranged between the end of the clamp and the frame and between the box body and the frame. The metal damping blocks are slidably connected to the frame.

[0017] According to a pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency provided by the present invention, the clamp includes a pair of clamps, which are arranged opposite to each other to fix the pipeline, wherein the clamp located at the bottom is provided with the protrusion.

[0018] The pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency provided by the present invention can ensure that the pipeline support vibration isolation device has a larger static stiffness value and a smaller dynamic stiffness value by arranging a first elastic member and a second elastic member, and making the second elastic member in a compressed state, and utilizing a combination of positive stiffness and negative stiffness, thereby effectively isolating low-frequency vibrations while providing effective support. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is one of the structural schematic diagrams of the pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency provided by the present invention.

[0021] Figure 2 This is the second structural schematic diagram of the pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency provided by the present invention.

[0022] Figure 3 yes Figure 1 Schematic diagram of the structure of the stiffness adjustment mechanism shown in FIG.

[0023] Reference numerals: 1. Frame; 2. Clamp; 21. Clamp; 3. First elastic member; 4. Metal damping block; 5. Stiffness adjustment mechanism; 51. Box; 52. Second elastic member; 53. First driver; 54. First baffle; 55. Second baffle; 56. Connecting rod; 57. First telescopic member; 61. Second driver; 62. Second telescopic member; 7. Vibration acceleration sensor; 8. Controller; 211. Bump. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Combine the following Figure 1-Figure 3 The invention describes a pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency.

[0026] like Figure 1As shown, in an embodiment of the present invention, a pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency comprises: a frame 1, a clamp 2, a first elastic member 3 and a pair of stiffness adjustment mechanisms 5. The clamp 2 is used to fix the pipeline, and the opposite ends of the clamp 2 are respectively slidably connected to the side walls of the frame 1, and the clamp 2 is provided with a protrusion 211, and the protrusion 211 is connected to the bottom surface of the frame 1 through the first elastic member 3, and a pair of stiffness adjustment mechanisms 5 are respectively arranged on both sides of the protrusion 211. Each stiffness adjustment mechanism 5 comprises: a box body 51 and a second elastic member 52, the box body 51 is slidably connected to the side wall of the frame 1, the second elastic member 52 is arranged in the box body 51, and one end of the second elastic member 52 passes through the box body 51 and is connected to the protrusion 211, wherein the second elastic member 52 is in a compressed state.

[0027] Specifically, in this embodiment, the frame 1 includes: a pair of side plates and a bottom plate, the pair of side plates are relatively arranged on both sides of the bottom plate and connected to the bottom plate. The frame 1 is installed on a fixed structure. The clamp 2 includes a pair of clamps 21, the pair of clamps 21 are relatively arranged to place the pipeline in the pair of clamps 21, the pair of clamps 21 are connected by bolts, and the pipeline can generate vertical vibration in the clamp 2. The opposite ends of the clamp 2 are respectively slidably connected to the side plates of the frame 1, and the lower part of the clamp 21 located below is provided with a protrusion 211, and the protrusion 211 is connected to the bottom plate of the frame 1 through the first elastic member 3. When the load of the pipeline is different, the distance between the clamp 2 and the bottom plate of the frame 1 is different, and at this time, the compression amount of the first elastic member 3 is different.

[0028] The two boxes 51 are respectively arranged on both sides of the protrusion 211, and each box 51 is slidably connected to the side plate of the frame 1. The purpose is: when the compression amount of the first elastic member 3 is different, the position of the box 51 is different, so that the connection part between the second elastic member 52 and the protrusion 211 is always horizontal. In this embodiment, the second elastic member 52 is arranged in the box 51 and is in a compressed state. The second elastic member 52 provides negative stiffness in the vertical direction. Through the combination of the positive stiffness and negative stiffness of the three elastic members, a quasi-zero stiffness can be provided at the static equilibrium position of the pipeline, that is, a larger static stiffness value and a smaller dynamic stiffness value are provided near the static equilibrium position of the pipeline. The larger static stiffness value can ensure that the pipeline support vibration isolation device has a smaller deformation under the gravity of the pipeline, and the smaller dynamic stiffness value can reduce the vibration absorption frequency of the pipeline support vibration isolation device and improve the low-frequency vibration absorption performance.

[0029] The pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency provided in the embodiment of the present invention can ensure that the pipeline support vibration isolation device has a larger static stiffness value and a smaller dynamic stiffness value by setting a first elastic member and a second elastic member, and making the second elastic member in a compressed state, and utilizing a combination of positive stiffness and negative stiffness, thereby effectively isolating low-frequency vibrations while providing effective support.

[0030] like Figure 1 As shown, in an embodiment of the present invention, each stiffness adjustment mechanism 5 also includes a first telescopic structure, which is arranged in the box body 51 and connected to the second elastic member 52. The first telescopic structure is used to drive the second elastic member 52 to compress, so as to adjust the pre-compression amount of the second elastic member 52, thereby changing the negative stiffness characteristic curve of the pipeline support vibration isolation device, so that the pipeline support vibration isolation device can absorb vibration under different loads. In an optional embodiment of the present invention, the first telescopic structure can be a device capable of telescopic movement such as a hydraulic cylinder, a pneumatic cylinder, and an electric cylinder; in another optional embodiment of the present invention, the first telescopic structure includes: a first driver 53 and a first telescopic member 57, the first driver 53 is connected to the first telescopic member 57, the first telescopic member 57 is connected to the second elastic member 52, and the first driver 53 drives the first telescopic member 57 to contract when moving, thereby adjusting the pre-compression amount of the second elastic member 52. Optionally, the first driver 53 can be a linear motor.

[0031] Optionally, the first elastic member 3 and the second elastic member 52 may be springs.

[0032] like Figure 3 As shown, in the embodiment of the present invention, each stiffness adjustment mechanism 5 further includes a first baffle 54. The first baffle 54 is disposed between the first telescopic member 57 and the second elastic member 52, and the first baffle 54 is connected to the first telescopic member 57. When the first driver 53 moves, it can push the first baffle 54 to move in a direction close to the protrusion 211, thereby adjusting the pre-compression amount of the second elastic member 52.

[0033] In an optional embodiment of the present invention, the box body 51 may be a structure with an open top surface, an open front side surface, or an open rear side surface to place the first driver 53, the first telescopic member 57, the first baffle 54, and the second elastic member 52, and one end of the second elastic member 52 passes through the plate surface of the box body 51 and is connected to the protrusion 211; in another optional embodiment, the end of the box body 51 adjacent to the protrusion 211 is an open end, so that the first driver 53, the first telescopic member 57, the first baffle 54, and the second elastic member 52 are placed in the box body 51 through the open end. The open end is provided with a second baffle 55, and the second elastic member 52 passes through the second baffle 55 and is connected to the protrusion 211.

[0034] like Figure 3 As shown, each stiffness adjustment mechanism 5 further includes a connecting rod 56 , and two ends of the connecting rod 56 are respectively connected to the protrusion 211 and the second elastic member 52 .

[0035] like Figure 1As shown, in an embodiment of the present invention, the pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency also includes a second telescopic structure, and the two ends of the second telescopic structure are respectively connected to the bottom plate of the frame 1 and the box 51, and the second telescopic structure is used to adjust the height of the box 51, so that after the height of the clamp 2 changes, the height of the box 51 changes accordingly, so that the connecting rod 56 is always in a horizontal state, so that the height of the symmetrical point of the negative stiffness characteristic curve composed of the two second elastic members 52 is consistent with the balance height of the clamp 2.

[0036] Optionally, the second telescopic structure can be a device such as a hydraulic cylinder, a pneumatic cylinder, an electric cylinder, etc. that can perform telescopic movement; the second telescopic structure can also be a telescopic member, so that when the height of the clamp 2 changes, the height of the box 51 changes accordingly; the second telescopic structure can also include: a second driver 61 and a second telescopic member 62, the second driver 61 is connected to the bottom plate of the frame 1, and the two ends of the second telescopic member 62 are respectively connected to the second driver 61 and the box 51. When the second driver 61 moves, it drives the second telescopic member 62 to extend and retract, and when the second telescopic member 62 extends and retracts, it drives the box 51 to move in the vertical direction to adjust the height of the box 51. In this embodiment, the second driver 61 is a linear motor.

[0037] like Figure 2 As shown, in an embodiment of the present invention, the pipeline support vibration isolation device also includes: a plurality of vibration acceleration sensors 7 and a controller 8, the plurality of vibration acceleration sensors 7 are respectively arranged on the clamp 2 and the frame 1, and the controller 8 is used to control the movement of the first telescopic structure and the second telescopic structure according to the vibration acceleration signal sent by the vibration acceleration sensor.

[0038] Specifically, the vibration acceleration sensor 7 is respectively arranged on the top of the clamp 2 and the outside of the frame 1, and is used to collect the vibration acceleration signal of the clamp 2 close to the pipeline and the vibration acceleration signal of the frame 1, and send the collected vibration acceleration signal to the controller 8. The controller 8 first performs Fourier transform on the vibration acceleration signal to obtain the excitation frequency, and calculates the stiffness of the pipeline support vibration isolation device according to the principle that the excitation frequency is equal to the natural frequency of the pipeline support vibration isolation device. The compression amount of the three elastic parts is obtained from the stiffness, and the movement amount of the first driver 53 and the second driver 61 is controlled according to the compression amount, so that the natural frequency of the pipeline support vibration isolation device is equal to the excitation frequency.

[0039] like Figure 1As shown, in an embodiment of the present invention, the pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency further includes a plurality of metal damping blocks 4. Metal damping blocks 4 are provided between the end of the clamp 2 and the side plate of the frame 1, and between the box 51 and the side plate of the frame 1. The metal damping blocks 4 can reduce the lateral vibration of the clamp 2 and the box 51 to a certain extent and transmit it to the frame 1. At the same time, the metal damping blocks 4 are slidably connected to the side plates of the frame 1.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency, characterized in that: include: A frame, a clamp, a first elastic member and a pair of stiffness adjustment mechanisms; The clamp is used to fix the pipeline, and the opposite ends of the clamp are respectively slidably connected to the side walls of the frame, and the clamp is provided with a protrusion, and the protrusion is connected to the bottom surface of the frame through the first elastic member, and a pair of stiffness adjustment mechanisms are respectively arranged on both sides of the protrusion; Each of the stiffness adjustment mechanisms includes: a box body and a second elastic member, wherein the box body is slidably connected to the side wall of the frame, the second elastic member is arranged in the box body, one end of the second elastic member passes through the box body and is connected to the protrusion, wherein the second elastic member is in a compressed state.

2. The pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency according to claim 1, characterized in that: Each of the stiffness adjustment mechanisms further includes a first telescopic structure, which is disposed in the box and connected to the second elastic member, and is used to adjust the pre-compression amount of the second elastic member.

3. The pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency according to claim 2, characterized in that: It also includes a pair of second telescopic structures, both ends of each of which are respectively connected to the bottom surface of the box body and the frame, and the second telescopic structures are used to drive the box body to move along the elastic force direction of the first elastic member.

4. The pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency according to claim 3 is characterized in that: Also includes: A plurality of vibration acceleration sensors and a controller, wherein the plurality of vibration acceleration sensors are respectively arranged on the fixture and the frame, and the controller is used for controlling the movement amount of the first telescopic structure and the second telescopic structure according to the vibration acceleration signals sent by the vibration acceleration sensors.

5. The pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency according to claim 2, characterized in that: The first telescopic structure comprises: a first driver and a first telescopic member, wherein the first driver and the first telescopic member are arranged in the box; The first driver is connected to the first telescopic member, and the first telescopic member is connected to the second elastic member. When the first driver moves, it can drive the first telescopic member to extend and retract, so as to adjust the pre-compression amount of the second elastic member.

6. The pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency according to claim 5, characterized in that: Each of the stiffness adjustment mechanisms further includes a first baffle; The first baffle is disposed between the first telescopic member and the second elastic member. The first baffle is connected to the first telescopic member and can move under the action of the first telescopic member. The second elastic member abuts against the first baffle.

7. The pipeline support vibration isolation device with adjustable load-bearing capacity and vibration isolation frequency according to claim 6, characterized in that: Each of the stiffness adjustment mechanisms further includes a connecting rod, and two ends of the connecting rod are respectively connected to the protrusion and the second elastic member.

8. The pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency according to claim 3, characterized in that: Each of the second telescopic structures includes: a second driver and a second telescopic member, the second driver is connected to the bottom surface of the frame, the two ends of the second telescopic member are respectively connected to the second driver and the box body, and the second driver can drive the second telescopic member to extend and retract when moving, so as to drive the box body to move.

9. The pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency according to claim 1, characterized in that: It also includes a plurality of metal damping blocks, which are arranged between the end of the clamp and the frame and between the box body and the frame, and are slidably connected to the frame.

10. The pipeline support vibration isolation device with adjustable bearing capacity and vibration isolation frequency according to claim 1, characterized in that: The clamp comprises a pair of clamps, which are arranged opposite to each other to fix the pipeline, wherein the clamp located at the lower side is provided with the protrusion.

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