CN214305012U - Vibration damping device - Google Patents
Vibration damping device Download PDFInfo
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- CN214305012U CN214305012U CN202022946648.1U CN202022946648U CN214305012U CN 214305012 U CN214305012 U CN 214305012U CN 202022946648 U CN202022946648 U CN 202022946648U CN 214305012 U CN214305012 U CN 214305012U
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Abstract
The present disclosure provides a vibration damping device for connecting a base and a device to be vibration-isolated, including: a hydraulic cylinder configured to connect the base, the hydraulic cylinder including a piston cavity; the piston is configured to be connected with a vibration isolation device, and the piston is arranged in a piston cavity in a reciprocating manner along a first direction and forms a first hydraulic pressure cavity together with the hydraulic cylinder body; a first resilient means disposed within the first hydraulic chamber configured to apply a force to the piston in a direction away from the first resilient means; and a second elastic device having a second hydraulic chamber that communicates with the first hydraulic chamber and at least a part of a wall of which is an elastic wall, the first hydraulic chamber and the second hydraulic chamber forming at least a part of a sealed chamber configured to be filled with a rigid liquid. The vibration damping device can realize the anti-resonance of the equipment through the parameter design of each component, and is favorable for improving the vibration damping effect of the low-frequency characteristic frequency band.
Description
Technical Field
The disclosure relates to the technical field of vibration reduction, in particular to a vibration reduction device.
Background
During operation, mechanical devices generate vibrations at characteristic frequencies related to their operating principles, such as those related to the rotational frequency of a rotating machine, those related to the meshing frequency of the rotors of a meshing machine, and so forth. In the related art, in order to reduce the vibration generated during the operation of mechanical equipment (also called vibration isolation equipment), a rubber vibration isolator, such as a BE type or 6JX type rubber vibration isolator, is generally used as a vibration attenuation device.
The rubber vibration isolator has a good vibration isolation effect on medium-frequency and high-frequency vibration, and the low-frequency vibration isolation effect is limited. The rubber vibration isolator can be used for reducing vibration transmitted to the base or the outside by vibration isolation equipment, and the vibration isolation equipment is elastically installed through the rubber vibration isolator, so that the vibration isolation equipment vibrates greatly and is not beneficial to safe and reliable operation of internal parts of the equipment.
SUMMERY OF THE UTILITY MODEL
The disclosed object aims at providing a vibration damping device for connecting a base and a device to be vibration-isolated, comprising:
a hydraulic cylinder configured to connect to the base, the hydraulic cylinder including a piston cavity;
a piston configured to be connected with the vibration-isolated equipment, wherein the piston is arranged in the piston cavity in a reciprocating manner along a first direction and forms a first hydraulic pressure cavity together with the hydraulic cylinder body;
a first resilient device disposed within the first hydraulic chamber configured to apply a force to the piston in a direction away from the first resilient device; and
a second resilient means having a second hydraulic chamber, the second hydraulic chamber with the first hydraulic chamber intercommunication just at least part of the chamber wall of second hydraulic chamber is the elastic wall, the first hydraulic chamber with the second hydraulic chamber forms at least part of a sealed chamber, the sealed chamber is configured to fill rigid liquid.
In some embodiments of the present invention, the,
the hydraulic cylinder block includes a plurality of the piston chambers;
the vibration damping device comprises a plurality of pistons and a plurality of first elastic devices, the pistons are arranged in one-to-one correspondence with the piston cavities, and the first elastic devices are arranged in one-to-one correspondence with the piston cavities.
In some embodiments, the plurality of piston cavities are evenly distributed about a circumference of a first axis extending in the first direction.
In some embodiments of the present invention, the,
the first elastic device comprises a spring; and/or the presence of a gas in the gas,
the resilient wall comprises a bellows.
In some embodiments, the second elastic device further comprises:
the liquid injection hole is arranged on the wall of the second hydraulic cavity; and
and the plug is used for plugging the liquid injection hole.
In some embodiments, the wall of the second hydraulic chamber further includes a rigid wall, and the liquid injection hole and the plug are disposed on the rigid wall.
In some embodiments, the chamber wall of the second hydraulic chamber further includes a rigid wall, and a communication port through which the second hydraulic chamber communicates with the first hydraulic chamber is provided on the rigid wall.
In some embodiments, the chamber wall of the second hydraulic chamber further comprises a rigid wall through which the second elastic means is connected with the hydraulic cylinder.
In some embodiments, the hydraulic cylinder block includes a hollow cavity, and the second resilient device is disposed within the hollow cavity.
In some embodiments, the vibration damping device further comprises a weight, and the weight acts on the elastic wall by gravity.
In some embodiments, the chamber wall of the second hydraulic chamber further comprises a rigid wall, the weight disposed on the rigid wall.
In some embodiments, further comprising:
a mount configured to connect with the base;
and the third elastic device is positioned between the hydraulic cylinder body and the mounting seat, and the hydraulic cylinder body is arranged on the mounting seat through the third elastic device.
In some embodiments, the bottom of the hydraulic cylinder is provided with a mounting flange, the mounting seat comprising:
the base comprises a mounting opening arranged in the middle of the base, and the mounting flange is positioned in the mounting opening; and
and the seat cover comprises a central through hole, the hydraulic cylinder body penetrates through the central through hole, and the seat cover covers the upper part of the mounting flange and is fixedly connected with the base.
In some embodiments, the third elastic means comprises:
a first resilient pad located between the base and at least one of the mounting flange and the bottom of the hydraulic cylinder; and/or the presence of a gas in the gas,
a second resilient pad located between the seat cover and the mounting flange.
In some embodiments, the damping device comprises a limiting device for limiting the displacement of the piston in the first direction.
In some embodiments, the stop means comprises a first stop protrusion disposed within a piston cavity of the hydraulic cylinder block projecting towards a centre of the piston cavity, the first stop protrusion being configured to limit an extreme position of movement of the piston towards the first resilient means.
In some embodiments, further comprising:
a piston support rod which is positioned at one end of the piston far away from the first elastic device and is fixedly connected with the piston, and the piston support rod is configured to be connected with the vibration-isolated equipment; and
the cylinder cover is connected to the top of the hydraulic cylinder body and provided with a cylinder cover through hole, and the piston stay bar penetrates through the cylinder cover through hole;
wherein the limiting device comprises a second limiting protrusion arranged radially outside the piston stay bar and between the piston and the cylinder head, configured to limit an extreme position of the piston moving towards a side away from the first elastic device.
In some embodiments, the cylinder head further comprises a fourth elastic device, and the fourth elastic device is arranged between the second limiting protrusion and the cylinder head.
In some embodiments, the fourth resilient means comprises a third resilient pad.
In some embodiments, the vibration isolator further comprises a top cover connected to an end of the piston brace remote from the piston and configured to connect with the vibration isolated device.
In some embodiments, a rigid liquid is also included, which fills the enclosed cavity.
In some embodiments, the ratio of the effective rigid liquid acting area Ap of all the lower portions of the piston to the effective rigid liquid acting area As inside the second hydraulic pressure chamber is α, where α > 1.
According to the damping device provided by the disclosure, a hydraulic cylinder (comprising a hydraulic cylinder body and a piston) with a first hydraulic pressure cavity and a first elastic device and a second elastic device with an elastic wall with a second hydraulic pressure cavity are designed in the damping device, and the interiors of the first hydraulic pressure cavity and the second hydraulic pressure cavity are communicated through rigid liquid. The mechanical equipment (equipment to be vibration-isolated) is connected with the hydraulic cylinder through the first elastic device. The vibration damping device can realize the anti-resonance of the equipment through the parameter design of each component, and is favorable for improving the vibration damping effect of the low-frequency characteristic frequency band.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
fig. 1 is an exploded schematic view of a vibration damping device according to an embodiment of the present disclosure.
Fig. 2 is a schematic top view of the vibration damping device of the embodiment shown in fig. 1.
Fig. 3 is a schematic sectional view taken along the line a-a in fig. 2.
Fig. 4 is a schematic view of a vibration damping device according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present disclosure, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present disclosure.
In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are presented only for the convenience of describing and simplifying the disclosure, and in the absence of a contrary indication, these directional terms are not intended to indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
As shown in fig. 1 to 3, the vibration damping device according to the embodiment of the present disclosure is used to connect a base and a device to be vibration-isolated. The damping device comprises a hydraulic cylinder 4, a piston 9, a first elastic means and a second elastic means.
The hydraulic cylinder 4 is configured as a connection base, the hydraulic cylinder 4 comprising a piston cavity. The piston 9 is configured to be connected to a device to be vibration isolated, and the piston 9 is reciprocally disposed in a first direction in a piston chamber and forms a first hydraulic chamber with the hydraulic cylinder 4. A first resilient means is provided in the first hydraulic chamber, configured to apply a force to the piston 9 in a direction away from the first resilient means. A second hydraulic cavity is arranged in the second elastic device, the second hydraulic cavity is communicated with the first hydraulic cavity, at least part of the cavity wall of the second hydraulic cavity is an elastic wall, the first hydraulic cavity and the second hydraulic cavity form at least one part of a closed cavity, and the closed cavity is used for filling rigid liquid.
The embodiment of the disclosure provides a vibration damping device with a reliable structure aiming at the problems that the traditional rubber vibration isolator is poor in low-frequency vibration isolation effect and difficult in vibration isolation of the characteristic frequency of mechanical equipment. A hydraulic cylinder (comprising a hydraulic cylinder body and a piston) with a first hydraulic pressure cavity and a first elastic device and a second elastic device with a second hydraulic pressure cavity and an elastic wall are designed in the damping device, and the first hydraulic pressure cavity and the second hydraulic pressure cavity are communicated through rigid liquid. The mechanical equipment (equipment to be vibration-isolated) is connected with the hydraulic cylinder through the first elastic device. The vibration damping device can realize the antiresonance of the equipment through the parameter design of each component, has lower vibration displacement, is beneficial to improving the vibration damping effect of a low-frequency characteristic frequency band, can design the single-peak characteristic frequency into the antiresonance frequency, and realizes the lower dynamic force transmission of the equipment to the base under the antiresonance frequency.
As shown in fig. 1-3, in some embodiments, the hydraulic cylinder block 4 includes a plurality of piston chambers; the vibration damping device includes a plurality of pistons 9 and a plurality of first elastic devices, the plurality of pistons 9 are disposed in one-to-one correspondence with the plurality of piston chambers, and the plurality of first elastic devices are disposed in one-to-one correspondence with the plurality of piston chambers.
As shown in fig. 1-3, in some embodiments, the plurality of piston cavities are evenly distributed about a circumference of a first axis extending in the first direction.
As shown in fig. 1 to 3, in some embodiments, the first elastic means comprises a spring 7. In some embodiments, the resilient wall comprises a bellows 18.
As shown in fig. 1 to 3, in some embodiments, the second elastic means further comprises a liquid injection hole and a plug 17. The liquid injection hole is formed in the wall of the second hydraulic cavity. The plug 17 plugs the liquid injection hole. The cavity wall of the second hydraulic cavity further comprises a rigid wall, and the liquid injection hole and the plug 17 are arranged on the rigid wall.
As shown in fig. 1 to 3, in some embodiments, the chamber wall of the second hydraulic chamber further includes a rigid wall, and a communication port through which the second hydraulic chamber communicates with the first hydraulic chamber is provided on the rigid wall.
As shown in fig. 1 to 3, in some embodiments, the chamber wall of the second hydraulic chamber further comprises a rigid wall through which the second elastic means is connected with the hydraulic cylinder 4.
As shown in fig. 1 to 3, in some embodiments, the hydraulic cylinder block 4 comprises a hollow cavity, and the second elastic device is disposed in the hollow cavity.
As shown in fig. 1-3, in some embodiments, the damping device further comprises a weight 16, and the weight of the weight 16 acts on the elastic wall.
As shown in fig. 1-3, in some embodiments, the wall of the second hydraulic chamber further includes a rigid wall on which weight 16 is disposed.
As shown in fig. 1-3, in some embodiments, the vibration damping device further includes a mount and a third resilient device. The mount is configured to be coupled to the base. The third elastic device is located between the hydraulic cylinder body 4 and the mounting seat, and the hydraulic cylinder body 4 is mounted on the mounting seat through the third elastic device. The configuration has the function of resisting impact under severe working conditions, thereby being beneficial to improving the safety and the reliability of equipment operation.
As shown in fig. 1 to 3, in some embodiments, the bottom of the hydraulic cylinder block 4 is provided with a mounting flange 20, and the mounting seat comprises a base plate 1 and a seat cover 5. The base 1 comprises a mounting opening in its middle, in which the mounting flange 20 is located. The seat cover 5 comprises a central through hole, the hydraulic cylinder body 4 passes through the central through hole, and the seat cover 5 covers the mounting flange 20 and is fixedly connected with the base 1. The configuration has the anti-drop protection function under the severe working condition, thereby being beneficial to improving the safety and the reliability of the operation of the equipment.
As shown in fig. 1 to 3, in some embodiments, the third elastic means comprises at least one of the first elastic pad 2 and the second elastic pad 3. The first elastic pad 2 is located between the base 1 and at least one of the bottom of the hydraulic cylinder 4 and the mounting flange 20. The second elastic cushion 3 is located between the seat cover 5 and the mounting flange 20.
As shown in fig. 1 to 3, in some embodiments the damping means comprises a limiting means for limiting the displacement of the piston 9 in the first direction.
As shown in fig. 1 to 3, in some embodiments, the limiting means comprise a first limiting projection 19 provided in the piston chamber of the hydraulic cylinder 4, projecting towards the centre of the piston chamber, the first limiting projection 19 being configured to limit the extreme position of the piston 9 moving towards the first elastic means.
As shown in fig. 1-3, in some embodiments, the damping device includes a piston brace 10 and a cylinder head 12. The piston stay 10 is located at an end of the piston 9 remote from the first elastic means and is fixedly connected with the piston 9, the piston stay 10 being configured to be connected with a vibration-isolated device. The cylinder head 12 is connected to the top of the hydraulic cylinder 4 and is provided with a cylinder head bore through which the piston stay 10 passes. The limiting means comprise a second limiting projection 21, the second limiting projection 21 being arranged radially outside the piston stay 10 and between the piston 9 and the cylinder head 12, configured to limit the extreme position of the piston 9 moving towards the side away from the first elastic means.
As shown in fig. 1 to 3, in some embodiments, the damping device further comprises a fourth elastic device disposed between the second limit projection 21 and the cylinder head 12.
As shown in fig. 1 to 3, in some embodiments, the fourth elastic means comprises a third elastic pad 11.
As shown in fig. 1 to 3, in some embodiments, the vibration isolation device further includes a top cover 15, and the top cover 15 is connected to an end of the piston stay 10 away from the piston 9 and configured to be connected to the vibration isolation device.
In some embodiments, the damping device comprises a rigid liquid filled in the closed cavity.
In some embodiments, the ratio of the effective rigid liquid acting area Ap of the lower portion of all the pistons 9 to the effective rigid liquid acting area As inside the second hydraulic pressure chamber is α, where α > 1. The arrangement can further utilize the ratio of the cross section area of the liquid chambers at the two ends of the inertia channel to the cross section area of the inertia channel as an amplifying mechanism, and the purpose of vibration reduction is realized by utilizing inertia coupling.
The damping device of the disclosed embodiment is a hydroelastic dynamic antiresonance damping device. The vibration damping device and the operation principle thereof according to the embodiment of the present disclosure will be described in further detail with reference to fig. 1 to 4.
As shown in fig. 1 to 3, the vibration damping device may be installed between the mechanical equipment (equipment to be vibration-isolated) and the base. The damping device mainly comprises a mounting seat, a first elastic device, a second elastic device, a third elastic device, a fourth elastic device, a hydraulic cylinder body 4, a seat cover fastening screw 6, a sealing ring 8, a piston 9, a piston support rod 10, a cylinder cover 12, a cylinder cover fastening screw 13, a top cover fastening nut 14, a top cover 15, a balancing weight 16, a first limiting bulge 19, a mounting flange 20, a second limiting bulge 21, a rigid top wall 22 and a rigid bottom wall 23.
The mount includes a base 1 and a cover 5.
The first elastic means comprise a spring 7. The spring 7 is, for example, a coil spring made of spring steel, and the spring 7 may also be subjected to corrosion protection. The second elastic means comprise a bellows 18 as elastic wall, a plug 17, and a rigid top wall 22 and a rigid bottom wall 23 as rigid walls. The third elastic means comprise a first elastic pad 2 and a second elastic pad 3. For example, the second elastic pad 2 is a rubber pad, and the second elastic pad 3 is a rubber pad. The fourth elastic means comprises a third elastic pad 11, for example, the third elastic pad 11 is a rubber pad.
The base 1 is fixedly connected with the base through bolts. The middle part of base 1 is equipped with the installing port, has first cushion 2 in the installing port, and the mounting flange 20 of hydraulic cylinder body 4 and hydraulic cylinder body 4 bottom compresses tightly first cushion 2. The upper part of the mounting flange 20 at the periphery of the hydraulic cylinder 4 is provided with a second elastic cushion 3, and a gap can exist between the second elastic cushion 3 and the seat cover 5 under the normal state. The second elastic cushion 3 plays a role in buffering when the hydraulic cylinder body 4 impacts the seat cover 5 upwards under special working conditions. The seat cover 5 is fixedly connected with the base 1 through a seat cover fastening screw 6.
The plurality of piston chambers are evenly distributed around the circumferential direction of a first axis extending in a first direction (up-down direction in fig. 3). For example, the hydraulic cylinders 4 are arranged uniformly in six in the circumferential direction. The number of piston chambers may be provided more or less, e.g. one, two, five, eight, etc. Each piston chamber is provided with a piston 9, a spring 7, a piston stay 10 and a sealing ring 8. The piston 9 can be subjected to corrosion prevention treatment and wear resistance treatment. The piston 9 is reciprocally movably disposed in the piston chamber in the first direction and forms a first hydraulic pressure chamber with the hydraulic cylinder 4. A spring 7 is disposed in the first hydraulic chamber and applies an upward force to the piston 9. A second hydraulic cavity is arranged in the second elastic device, the second hydraulic cavity is communicated with the first hydraulic cavity, and part of the cavity wall of the second hydraulic cavity is a corrugated pipe 18 serving as an elastic wall. The sealed cavity is filled with rigid liquid. And the sealing ring 8 is arranged between the piston 9 and the hydraulic cylinder body 4 and is used for sealing a gap between the piston and the hydraulic cylinder body to ensure the tightness of the sealed cavity.
The top cover 15 is provided with a top cover perforation. The upper part of the piston support rod 10 comprises a threaded section, and a step surface is arranged below the threaded section. The thread section penetrates through a top cover through hole of the top cover 15, and the piston stay bar 10 is fixedly connected with the top cover 15 through the matching of the step surface and the thread section and a top cover fastening nut 14. The middle of the top cover 15 is provided with a mounting hole which is used for being connected with the vibration isolation equipment through bolts. The hydraulic cylinder body 4 is fixedly connected with the cylinder cover 12 through a cylinder cover fastening screw 13. The cylinder head 12 has a central through hole in the middle. The central through hole can avoid the movement of the second elastic device, and the vibration damping device is more compactly arranged.
The inner wall of each piston cavity of the hydraulic cylinder body 4 is provided with a first limiting bulge 19, and the first limiting bulge 19 can prevent the spring 7 from being compressed downwards through the piston support rod 10 and the piston 9 fixed by the vibration isolation equipment when impact occurs, so that overlarge displacement is generated, the spring 7 can be prevented from exceeding the elastic deformation limit and being unrecoverable, and the limiting effect on the vibration isolation equipment can be realized.
The piston support rod 10 is connected with the piston 9 through threads, and a second limiting bulge 21 is machined in the middle of the piston support rod 10. The lower edge of the second limiting bulge 21 is tightly attached to the upper surface of the piston 9, and the upper edge of the second limiting bulge 21 is provided with a third elastic pad 11. Under the impact working condition, when the piston support rod 10 fixedly connected with the vibration isolation device moves upwards, the third elastic pad 11 can play a role in impact resistance buffering, and meanwhile, the cylinder cover 12 plays a role in limiting the piston support rod 10.
The second elastic device is arranged in a hollow cavity arranged at the center of the hydraulic cylinder body 4. A rigid top wall 22 is mounted to the top end of the bellows 18. The rigid top wall 22 may be connected to the bellows 18 by a threaded connection. A rigid bottom wall 23 is mounted to the bottom of the bellows 18. The rigid bottom wall 23 comprises a tubular portion which is inserted into the bottom wall of the hollow cavity. A connecting channel 24 communicated with the first hydraulic cavity is further arranged in the bottom wall of the hollow cavity, and a communicating hole communicated with the connecting channel is formed in the tubular part. Wherein, the second hydraulic chamber is enclosed by the bellows 18, the rigid top wall 22 and the rigid bottom wall 23. The closed chamber comprises the second hydraulic chamber, the first hydraulic chambers and the connecting channels 24 connecting the second hydraulic chamber and the first hydraulic chambers.
The bellows 18 may be made of a corrosion resistant material. The weight 16 is disposed on a rigid top wall 22 above the bellows 18. The middle position of the rigid top wall 22 is designed with a threaded hole for connecting a balancing weight. The weight 16 is screwed into the bellows 18 via the threaded hole. The pour hole and the plug 17 are both arranged on the rigid top wall 22. And the liquid injection hole is used for injecting rigid liquid into the closed cavity, and the liquid injection hole is blocked by a plug 17 after the rigid liquid is injected, so that the closed cavity is sealed.
The spring 7 acts as a support for the equipment to be vibration isolated and the stiffness of the bellows 18 provides the spring force of the dynamic antiresonant vibration isolation structure. And the first elastic pad 2 plays a secondary vibration isolation role for the hydraulic cylinder body 4 and the vibration isolation equipment.
The vibration reduction device is mainly applied to the vibration reduction of low-frequency characteristic frequency of mechanical equipment such as a compressor. The principle of vibration damping by the vibration damping device will be described below with reference to fig. 4.
Mechanical devices generate low frequency characteristic frequencies during operation. The vertical vibration displacement of the piston 9 fixedly connected with the mechanical equipment is x1, the vibration displacement of the hydraulic cylinder 4 is x2, and the displacement of the configuration mass 16 on the upper part of the bellows 18 is x 3. The effective active area of the rigid liquid in the lower part of all the pistons 9 is Ap and the effective active area of the rigid liquid in the interior of the bellows 18 is As. Because the airtight cavity is airtight and the rigid liquid is full of the airtight cavity, when vibration occurs, the volumes of the rigid liquid entering and exiting all the first hydraulic cavities are equal to the volumes of the rigid liquid entering and exiting the second hydraulic cavities (namely, entering and exiting the corrugated pipe 18), and accordingly a rigid liquid volume equality formula can be obtained:
Ap(x1-x2)＝As(x2-x3)
the ratio of the effective rigid liquid acting area Ap of the lower part of all the pistons 9 to the effective rigid liquid acting area As of the inside of the bellows 18 is made to be alpha, namely Ap/As＝α(α>1)。
The sum of the mass of the mechanical device and the mass of all the piston supporting assemblies is m 1; the sum of the mass of the materials of the hydraulic cylinder body 4, the cylinder cover 12 and the lower part of the corrugated pipe 18 is approximately m 2; clump weight 16 and bellows 18 topThe sum of the material masses of the sections is approximately m 3. The total stiffness of all springs 7 is k1, k1＝∑k1i(ii) a The first elastic pad 2 has a rigidity k 2; the stiffness of the bellows 18 is k 3.
Total kinetic energy of the system:
total potential energy of the system:
substituting L-T-V into Lagrange's equation:
wherein Q is a generalized coordinate, QiFor generalized force, the system assumes that the excitation force of the mechanical equipment is F0sinωt。
Therefore, the dynamic antiresonance damping system of the present disclosure has the following dynamics:
the above equation set can be rewritten as
Wherein the vibration displacement of the mechanical equipment and the hydraulic cylinder can be obtained from the dynamic relation
The dynamic relation can be used for parameter design according to different vibration reduction targets. For example, when the minimum vibration of the mechanical equipment is taken as the target, the amplitude x of the mechanical equipment1Go to zero, at which time the anti-resonance frequency fAR1Designed as the target damping characteristic frequency. As another example, with minimal vibration imparted to the foundation, the amplitude x of the intermediate mass cylinder is expected2Go to zero, at which time the anti-resonance frequency will be
Designed as the target damping characteristic frequency.
The vibration damping device disclosed by the invention can be used for designing the anti-resonance frequency by adjusting the mass of the balancing weight, the rigidity of the spring, the rigidity of the rubber pad and the rigidity of the corrugated pipe according to the vibration damping purpose, so that the aim of extremely small dynamic force transmitted to the base by equipment or the aim of extremely small vibration amplitude of control equipment can be realized, and different vibration damping aims can be realized by targeted parameter design.
The vibration damping device of the embodiment of the disclosure can be applied to vibration damping of power auxiliary equipment, such as mechanical equipment including compressors, pumps, fans, motors and the like.
The embodiment of the disclosure provides a liquid-elastic dynamic antiresonance vibration damping device with a reliable structure, aiming at the problems that the low-frequency vibration isolation effect of the traditional rubber vibration isolator is poor and the vibration isolation of the characteristic frequency of mechanical equipment is difficult. A hydraulic cylinder and a corrugated pipe with a balancing weight are designed in the damping device, and the hydraulic cylinder (comprising a hydraulic cylinder body and a piston) is communicated with the interior of the corrugated pipe through rigid liquid. The mechanical equipment is connected with the hydraulic cylinder through a spring. The hydraulic cylinder is connected with the base through a rubber pad. The vibration damping device can realize anti-resonance of the equipment through parameter design of components and parts, and has lower vibration displacement. The vibration damping device of the embodiment of the disclosure has at least one of the following advantages:
through designing the hydraulic piston cylinder in the vibration damping device and the corrugated pipe counterweight structure communicated with the piston cylinder through liquid, the counterweight mass effect is amplified through the change of the effective action area of rigid liquid, so that the elastic force of the equipment supporting spring and the corrugated pipe is offset with the inertia force of the counterweight block, the anti-resonance is generated near the target characteristic frequency, and the dynamic force of the vibration-isolated equipment is transmitted to the foundation to have lower force transmission rate.
The anti-resonance frequency can be adjusted by changing the mass of the balancing weight and the rigidity of the spring, and the frequency adjustable characteristic is achieved. The characteristic vibration frequency can be designed in a targeted manner, so that anti-resonance at the frequency is realized, and the force transmitted to the base by the vibration equipment is extremely small.
The hydraulic cylinder body is connected with the base through a rubber pad, the center of the hydraulic cylinder body is provided with a corrugated pipe, and the corrugated pipe is provided with a balancing weight. When the vibration equipment is expected to have extremely small vibration, the mass of the balancing weight attached to the corrugated pipe, the rigidity of the rubber pad and the rigidity of the corrugated pipe can be designed in a matching mode, so that the vibration equipment generates anti-resonance under characteristic frequency, and the vibration equipment has lower vibration displacement.
The vibration damper is provided with a rubber pad and a steel material anti-falling structure. Under the bad working condition, the anti-impact and anti-drop protection function is provided, the reliable connection and the basic operation of mechanical equipment can be ensured, and the safety and the reliability of the operation of the equipment are improved.
The vibration transmitted to the base by the mechanical equipment can be minimized or the vibration of the mechanical equipment can be minimized by design according to the vibration damping target.
The frequency modulation method is rich by replacing the first elastic device with different elastic coefficients, the elastic cushion with different hardness, the second elastic device with different elastic coefficients (such as corrugated pipes with different wall thicknesses), the balancing weight with different masses or combining the above measures.
Finally, it should be noted that: the above examples are intended only to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the embodiments of the disclosure or equivalent replacements of parts of the technical features may be made, which are all covered by the technical solution claimed by the disclosure.
Claims (22)
1. A vibration damping device for connecting a base to a vibration-isolated device, comprising:
a hydraulic cylinder (4) configured to connect to the base, the hydraulic cylinder (4) comprising a piston cavity;
a piston (9) configured to be connected to the vibration-isolated equipment, wherein the piston (9) is reciprocally movably arranged in a first direction in the piston cavity and forms a first hydraulic cavity with the hydraulic cylinder body (4);
a first elastic means, arranged in the first hydraulic chamber, configured to apply a force to the piston (9) in a direction away from the first elastic means; and
a second resilient means having a second hydraulic chamber, the second hydraulic chamber with the first hydraulic chamber intercommunication just at least part of the chamber wall of second hydraulic chamber is the elastic wall, the first hydraulic chamber with the second hydraulic chamber forms at least part of a sealed chamber, the sealed chamber is configured to fill rigid liquid.
2. The vibration damping device according to claim 1,
the hydraulic cylinder block (4) comprises a plurality of said piston chambers;
the vibration damping device comprises a plurality of pistons (9) and a plurality of first elastic devices, the pistons (9) and the piston cavities are arranged in a one-to-one correspondence mode, and the first elastic devices and the piston cavities are arranged in a one-to-one correspondence mode.
3. The vibration damping device of claim 2 wherein the plurality of piston cavities are evenly distributed about a circumference of a first axis extending in the first direction.
4. The vibration damping device according to claim 1,
said first elastic means comprise a spring (7); and/or the presence of a gas in the gas,
the resilient wall comprises a bellows (18).
5. The vibration damping device according to claim 1, wherein the second elastic device further comprises:
the liquid injection hole is arranged on the wall of the second hydraulic cavity; and
and the plug (17) is used for plugging the liquid injection hole.
6. Damping device according to claim 5, characterized in that the wall of the second hydraulic chamber further comprises a rigid wall, on which the injection hole and the plug (17) are arranged.
7. The vibration damping device according to claim 1, wherein the chamber wall of the second hydraulic chamber further includes a rigid wall, and a communication port through which the second hydraulic chamber communicates with the first hydraulic chamber is provided in the rigid wall.
8. Damping device according to claim 1, characterized in that the wall of the second hydraulic chamber further comprises a rigid wall through which the second elastic means are connected with the hydraulic cylinder (4).
9. Damping device according to claim 1, characterized in that the hydraulic cylinder (4) comprises a hollow chamber, in which the second elastic means are arranged.
10. The damping device according to claim 1, characterized in that it further comprises a counterweight (16), the weight of said counterweight (16) acting on said elastic wall.
11. Damping device according to claim 10, characterized in that the chamber wall of the second hydraulic chamber further comprises a rigid wall on which the counterweight (16) is arranged.
12. The vibration damping device according to claim 1, further comprising:
a mount configured to connect with the base;
and the third elastic device is positioned between the hydraulic cylinder body (4) and the mounting seat, and the hydraulic cylinder body (4) is mounted on the mounting seat through the third elastic device.
13. Damping device according to claim 12, characterized in that the bottom of the hydraulic cylinder (4) is provided with a mounting flange (20), the mounting comprising:
the base (1) comprises a mounting opening arranged in the middle of the base, and the mounting flange (20) is positioned in the mounting opening; and
the seat cover (5) comprises a central through hole, the hydraulic cylinder body (4) penetrates through the central through hole, and the seat cover (5) covers the upper portion of the mounting flange (20) and is fixedly connected with the base (1).
14. The vibration damping device according to claim 13, wherein the third elastic means comprises:
a first resilient pad (2) located between the base (1) and at least one of the mounting flange (20) and the bottom of the hydraulic cylinder (4); and/or the presence of a gas in the gas,
a second resilient pad (3) located between the seat cover (5) and the mounting flange (20).
15. Damping device according to claim 1, characterized in that it comprises a limiting device for limiting the displacement of the piston (9) in the first direction.
16. Damping device according to claim 15, characterized in that the limiting device comprises a first limiting protrusion (19) arranged in the piston chamber of the hydraulic cylinder (4) protruding towards the centre of the piston chamber, the first limiting protrusion (19) being configured to limit the extreme position of the piston (9) moving towards the first elastic means.
17. The vibration damping device according to claim 15, further comprising:
a piston stay (10) located at an end of the piston (9) remote from the first elastic device and fixedly connected with the piston (9), the piston stay (10) being configured to be connected with the vibration-isolated equipment; and
the cylinder cover (12) is connected to the top of the hydraulic cylinder body (4) and provided with a cylinder cover through hole, and the piston support rod (10) penetrates through the cylinder cover through hole;
wherein the stop means comprise a second stop protrusion (21), said second stop protrusion (21) being arranged radially outside the piston stay (10) and between the piston (9) and the cylinder head (12), configured to limit the extreme position of the piston (9) moving towards the side away from the first elastic means.
18. Damping device according to claim 17, characterized in that it further comprises fourth elastic means arranged between said second stop protrusion (21) and said head (12).
19. Damping device according to claim 18, characterized in that the fourth elastic means comprise a third elastic pad (11).
20. The vibration damping device according to claim 17, further comprising a top cover (15), the top cover (15) being connected to an end of the piston stay (10) remote from the piston (9) and configured to be connected to the equipment to be vibration isolated.
21. The damping device according to any one of claims 1 to 20, further comprising a rigid liquid filling the closed cavity.
22. Damping device according to any of claims 1-20, characterized in that the ratio of the effective area Ap of the rigid liquid in the lower part of all the pistons (9) to the effective area As of the rigid liquid inside the second hydraulic chamber is given by α, where α > 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022946648.1U CN214305012U (en) | 2020-12-10 | 2020-12-10 | Vibration damping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022946648.1U CN214305012U (en) | 2020-12-10 | 2020-12-10 | Vibration damping device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214305012U true CN214305012U (en) | 2021-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022946648.1U Active CN214305012U (en) | 2020-12-10 | 2020-12-10 | Vibration damping device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214305012U (en) |
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2020
- 2020-12-10 CN CN202022946648.1U patent/CN214305012U/en active Active
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