CN210510072U - Compact ultralow-frequency nonlinear quasi-zero stiffness vibration isolator - Google Patents
Compact ultralow-frequency nonlinear quasi-zero stiffness vibration isolator Download PDFInfo
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- CN210510072U CN210510072U CN201921131207.7U CN201921131207U CN210510072U CN 210510072 U CN210510072 U CN 210510072U CN 201921131207 U CN201921131207 U CN 201921131207U CN 210510072 U CN210510072 U CN 210510072U
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Abstract
The utility model discloses a compact ultra-low frequency non-linear accurate zero rigidity isolator, including the vibration isolation carrier, the screw rod, the nut, interior magnetic ring, wave spring, the lower part slider, outer magnetic ring and upper portion slider, the vibration isolation carrier includes urceolus and the inner tube of the interior axial direction center of its intracavity, the screw rod is connected in the axial direction center of urceolus, the interior magnetic ring of nut centre gripping is connected on the screw rod, wave spring arranges annular region's bottom between inner tube and the urceolus in, the lower part slider, outer magnetic ring and upper portion slider slidable cup joint the top that corresponds wave spring on the vibration isolation carrier in proper order, interior magnetic ring and the equal axial of outer magnetic ring lead. The wave spring provides positive stiffness and can save 50% of space over a typical coil spring. When the upper sliding block is acted by axial force, the outer magnetic ring generates relative displacement relative to the inner magnetic ring, and the inner magnetic ring and the outer magnetic ring form a negative stiffness mechanism. The vibration isolator forms a compact structure by matching the vibration isolation carrier and the wave spring, and can be applied to application occasions with restriction of installation space.
Description
Technical Field
The utility model relates to a vibration isolator specifically is a zero accurate rigidity vibration isolator of compact ultralow frequency nonlinearity.
Background
The vibration isolation means that a proper vibration isolation device is inserted between a vibration source and a system to be isolated to isolate the direct transmission of vibration, and the essence of the vibration isolation is to install a vibration isolator between the vibration source and the system to be isolated. From an energy perspective, vibration isolation is the suppression of vibrations by changing the energy spectrum structure of the source excited by the vibration isolation system to reduce the energy passing through the frequency.
The former low-frequency vibration isolation is still a big research hotspot and difficulty in the field of vibration engineering. The vibration isolation method mainly comprises passive vibration isolation and active vibration isolation, and the active vibration isolation has a complex structure and high cost, so that the active vibration isolation is applied less at present, for example, the active suspension is mainly applied to high-grade automobiles, and the passive vibration isolation is a common vibration isolation method. The lower the natural frequency, the lower the initial vibration isolation frequency. However, because the natural frequency is low, the system stiffness is reduced, and thus a large static displacement is caused, so the passive vibration isolation generally encounters the contradiction between large static displacement and low natural frequency.
Therefore, the linear vibration isolation system generally cannot meet the requirement of low-frequency or ultra-low-frequency vibration isolation, and the concept of the nonlinear vibration isolation device is widely concerned for realizing full-frequency-band vibration isolation from low frequency to high frequency, and has been widely applied to the field of engineering vibration isolation.
The quasi-zero stiffness vibration isolation device has wide attention due to the characteristics of high static stiffness and low dynamic stiffness, the high static stiffness of the quasi-zero stiffness vibration isolation device enables the quasi-zero stiffness vibration isolation device to have larger bearing capacity, and the low dynamic stiffness enables the quasi-zero stiffness vibration isolation device to have better vibration isolation effect on low frequency and ultralow frequency.
The existing quasi-zero stiffness vibration isolator has the defects of large structure, inconvenient use, inconvenient installation and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a compact structure, convenient to use and simple to operate's accurate zero rigidity isolator of ultralow frequency nonlinearity.
The utility model provides a quasi-zero rigidity isolator of very low frequency nonlinearity of compact, including the vibration isolation carrier, the screw rod, the nut, interior magnetic ring, wave spring, the lower part slider, outer magnetic ring and upper portion slider, the vibration isolation carrier includes urceolus and the inner tube of the well axial direction center in its inner chamber, the axial direction center in the urceolus is connected to the screw rod, the interior magnetic ring of nut centre gripping is connected on the screw rod, wave spring arranges annular region's bottom between inner tube and the urceolus in, the lower part slider, outer magnetic ring and upper portion slider slidable cup joint the top that corresponds wave spring on the vibration isolation carrier in proper order, interior magnetic ring and the equal axial of outer magnetic.
In one embodiment of the above technical solution, the outer cylinder of the vibration isolation carrier is a cylinder with an open upper end, the inner cylinder is a cylinder with open two ends, and the lower end of the inner cylinder is connected to the bottom surface of the outer cylinder.
In an embodiment of the above technical solution, the screw rod is a full threaded rod, and a small-diameter threaded connector is arranged at a lower end of the screw rod and connected to the center of the bottom surface of the outer cylinder through the small-diameter threaded connector.
In an embodiment of the above technical solution, a plurality of axial grooves are uniformly distributed on a side wall of the outer cylinder.
In one embodiment of the above technical solution, the lower slider and the upper slider are vertically sleeved in the area between the outer cylinder and the inner cylinder of the vibration isolation carrier, and the outer walls of the lower slider and the upper slider are provided with protruding strips matched with the axial grooves on the side wall of the outer cylinder, and the protruding strips are inserted into the axial grooves.
In an embodiment of the above technical solution, the height of the lower slider is smaller than the height of the upper slider.
In an embodiment of the above technical solution, the wave spring is a WS-series wave spring.
The utility model discloses with the structure that the vibration isolation carrier design was put for interior, urceolus cover, with the annular gap region between inside and outside as wave spring's installation space, arrange wave spring in inside and outside, the regional lower part of annular between the section of thick bamboo, provide positive rigidity through wave spring. The characteristics of the wave spring are utilized: the ideal elastic force is provided in a small installation space, and 50% of space can be saved compared with a common spiral spring (linear spring). When the upper slide block is acted by axial force, the outer magnetic ring between the upper slide block and the lower slide block generates relative displacement relative to the inner magnetic ring on the screw rod, so that the inner magnetic ring and the outer magnetic ring form a negative stiffness mechanism, and the lower slide block is arranged on the wave spring. The utility model discloses a vibration isolation carrier and wave spring's supporting messenger isolator forms compact structure, can be applied to the application scenario of installation space restriction, connects in parallel to positive rigidity system with negative stiffness mechanism simultaneously, forms the quasi-zero rigidity in balanced position department between them, effectively reduces resonance amplitude, satisfies the vibration isolation demand.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural view of the vibration carrier of fig. 1.
Fig. 3 is a schematic structural view of a lower slider in fig. 1.
Fig. 4 is a schematic structural view of the upper slider in fig. 1.
Fig. 5 is a schematic structural view of the screw in fig. 1.
Detailed Description
As shown in fig. 1, the compact ultra-low frequency nonlinear quasi-zero stiffness vibration isolator disclosed in this embodiment comprises a vibration isolation carrier 1, a screw rod 2, a nut 3, an inner magnetic ring 4, a wave spring 5, a lower slider 6, an outer magnetic ring 7 and an upper slider 8.
As can be seen from fig. 1 and 2, the vibration isolation carrier 1 includes an outer cylinder 11 and an inner cylinder 12, the outer cylinder 11 is a cylinder with an open upper end, the inner cylinder 12 is a cylinder with two open ends, the inner cylinder and the outer cylinder are coaxial to a central line, the lower end of the inner cylinder is connected to the bottom surface of the outer cylinder, and the center of the bottom surface of the outer cylinder is provided with an internal threaded hole.
The side wall of the outer cylinder 11 is uniformly provided with a plurality of axial grooves, four are shown in fig. 1.
As can be seen from fig. 5, the screw 2 is a full-thread rod, and the lower end of the full-thread rod is provided with a small-diameter thread connector.
As can be seen from fig. 1, the small-diameter threaded connector at the lower end of the screw 2 is screwed into the internal threaded hole at the center of the bottom surface of the outer cylinder of the vibration isolation carrier 1. The upper part of the screw rod 2 is connected with two nuts 3, and an inner magnetic ring 4 is clamped between the two nuts.
The wave spring 5 of the present embodiment is preferably a WS-series wave spring, which is a continuously wound wave crest staggered wave spring, and is characterized by providing an ideal spring rate in a small installation space and saving 50% of space compared with a general coil spring (linear spring). The device is suitable for occasions with small load and deformation, low spring stiffness and axial pre-pressure.
As can be seen from fig. 3 and 4, the lower slider 6 and the upper slider 8 have the same structure, and are both annular bodies with raised lines on the outer walls, the aperture of the inner hole is slightly larger than the outer diameter of the inner cylinder of the vibration isolation carrier 1, and the number and the positions of the raised lines on the outer walls correspond to the axial grooves on the side wall of the vibration isolation carrier 1.
As can be seen from fig. 1, the wave spring 5 is disposed at the bottom of the annular region between the outer cylinder 11 and the inner cylinder 12 of the vibration-isolating carrier 1. The inner hole of the lower slide block 8 is sleeved on the inner cylinder of the vibration isolation carrier 1, the convex strip of the outer wall of the lower slide block is inserted into the axial groove of the outer cylinder of the vibration isolation carrier, and the bottom surface of the lower slide block is contacted with the wave crest of the wave spring 5.
The outer magnetic ring 7 is sleeved outside the inner cylinder of the vibration isolation carrier 1 and corresponds to the upper end of the lower sliding block, and the upper sliding block is sleeved on the vibration isolation carrier and corresponds to the upper end of the outer magnetic ring.
The height position of the inner magnetic ring 4 corresponds to the initial height position of the outer magnetic ring 7. The inner magnetic ring and the outer magnetic ring are axially magnetized, and when the inner magnetic ring and the outer magnetic ring are installed, the inner magnetic ring and the outer magnetic ring are installed in the same direction with the same magnetic poles, so that attraction force is generated between the inner magnetic ring and the outer magnetic ring when the inner magnetic ring and the outer magnetic ring have relative displacement.
As can be seen from the above structure, in the present embodiment, the vibration isolation carrier is designed to be a structure in which the inner cylinder and the outer cylinder are sleeved, the annular gap region between the inner cylinder and the outer cylinder is used as the installation space of the wave spring, the wave spring is disposed at the lower part of the annular region between the inner cylinder and the outer cylinder, and the wave spring provides positive stiffness, that is, the wave spring is a positive stiffness mechanism. When the upper slide block is acted by axial force, the outer magnetic ring between the upper slide block and the lower slide block generates relative displacement relative to the inner magnetic ring on the screw rod, so that the inner magnetic ring and the outer magnetic ring form a negative stiffness mechanism, and the lower slide block is arranged on the wave spring, so that the negative stiffness mechanism is connected with the positive stiffness mechanism in parallel. The vibration isolator is in a compact structure through the matching of the vibration isolation carrier and the wave spring, can be applied to application occasions with restriction of installation space, and meanwhile, the negative stiffness mechanism is connected in parallel to the positive stiffness system to form quasi-zero stiffness at the balance position of the negative stiffness mechanism and the positive stiffness system, so that the resonance amplitude is effectively reduced, and the vibration isolation requirement is met.
Therefore, the utility model discloses be particularly useful for but the application that receives less installation space restriction of needs damping, like aviation sky, precision instruments, hydraulic seal and high-end click etc..
Claims (7)
1. The utility model provides a compact ultralow frequency non-linear quasi-zero rigidity isolator which characterized in that: the vibration isolation carrier comprises an outer barrel and an inner barrel, wherein the inner barrel shares an axial center in an inner cavity of the outer barrel, the screw is connected to the axial center of the outer barrel, the nut clamps the inner magnetic ring and is connected to the screw, the wave spring is arranged at the bottom of an annular area between the inner barrel and the outer barrel, the lower slider, the outer magnetic ring and the upper slider are sequentially slidably sleeved above the vibration isolation carrier corresponding to the wave spring, and the inner magnetic ring and the outer magnetic ring are axially magnetized.
2. The vibration isolator according to claim 1, wherein: the outer cylinder of the vibration isolation carrier is a cylindrical cylinder with an opening at the upper end, the inner cylinder is a cylindrical cylinder with openings at two ends, and the lower end of the inner cylinder is connected to the bottom surface of the outer cylinder.
3. The vibration isolator according to claim 2, wherein: the screw rod is a full threaded rod, the lower end of the screw rod is provided with a small-diameter threaded connector, and the screw rod is connected to the center of the bottom surface of the outer barrel through the small-diameter threaded connector.
4. The vibration isolator according to claim 2, wherein: and a plurality of axial grooves are uniformly distributed on the side wall of the outer barrel.
5. The vibration isolator according to claim 4, wherein: the lower sliding block and the upper sliding block are vertically sleeved in the area between the outer cylinder and the inner cylinder of the vibration isolation carrier, convex strips matched with axial grooves in the side wall of the outer cylinder are arranged on the outer walls of the lower sliding block and the upper sliding block, and the convex strips are inserted into the axial grooves.
6. The vibration isolator according to claim 5, wherein: the height of the lower sliding block is smaller than that of the upper sliding block.
7. The vibration isolator according to claim 1, wherein: the wave spring is a WS series wave spring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921131207.7U CN210510072U (en) | 2019-07-18 | 2019-07-18 | Compact ultralow-frequency nonlinear quasi-zero stiffness vibration isolator |
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| CN201921131207.7U CN210510072U (en) | 2019-07-18 | 2019-07-18 | Compact ultralow-frequency nonlinear quasi-zero stiffness vibration isolator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734779A (en) * | 2020-06-29 | 2020-10-02 | 哈尔滨工业大学 | Ultralow frequency air spring vibration isolator based on radial magnetization magnetic ring negative stiffness structure |
| CN114161890A (en) * | 2021-11-30 | 2022-03-11 | 江苏大学 | Air suspension based on quasi-zero stiffness principle and structural design and optimization method thereof |
-
2019
- 2019-07-18 CN CN201921131207.7U patent/CN210510072U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734779A (en) * | 2020-06-29 | 2020-10-02 | 哈尔滨工业大学 | Ultralow frequency air spring vibration isolator based on radial magnetization magnetic ring negative stiffness structure |
| CN114161890A (en) * | 2021-11-30 | 2022-03-11 | 江苏大学 | Air suspension based on quasi-zero stiffness principle and structural design and optimization method thereof |
| CN114161890B (en) * | 2021-11-30 | 2024-05-10 | 江苏大学 | Air suspension based on quasi-zero stiffness principle and structural design and optimization method thereof |
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