CN201190755Y

CN201190755Y - Magnetic vibration absorber

Info

Publication number: CN201190755Y
Application number: CNU200720039409XU
Authority: CN
Inventors: 张珂
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-06-06
Filing date: 2007-06-06
Publication date: 2009-02-04
Anticipated expiration: 2017-06-06

Abstract

A magnetic shock absorber is characterized by comprising an upper magnet and a lower magnet whose like poles are oppositely arranged, an air clearance between the upper magnet and the lower magnet, formed by the repellent force of the magnets, which thickness follows the change of load or vibration, a cylinder shell divided into an upper part and a lower part as a top cover and a bottom plate which can longitudinally move relatively, wherein the lower magnet is fixed on the bottom plate and the upper magnet is suspended and fixed under the top cover. The magnetic shock absorber has simple structure and low cost, can reduce the interference of the shock over 20Hz, and effectively reduce the interference of the low-frequency shock under 20Hz.

Description

The magnetic vibration reducing device

Technical field:

The utility model relates to vibration damper, more specifically says so to reducing extraneous vibration to precision instrument and equipment, as the vibration damper of the interference of electron microscope, optical precision measurement etc.The vibrations that produce in the time of also can reducing simultaneously work such as equipment such as blower fan, pump are near the interference of miscellaneous equipment on every side.

Background technique:

At aspects such as various industrial technologies application and precision measuremnts, be influence and the interference of avoiding shaking, need to use various technological means, specifically just be to use the vibration damper of various principles.

Vibration damper can be divided into active and passive type two big classes according to working principle.Active is the direction and the amplitude of external vibrations surveyed by prober, and produces the vibrations that size is identical, amplitude is opposite, and original vibrations are offset.Active vibration damper good damping effect, but cost an arm and a leg (needing the hundreds thousand of units of RMB approximately), and the Installation and Debugging trouble needs regular maintenance.

The passive type vibration damper just utilizes the physical property of isolated material to reduce vibrations, current existing rubber type, spring, the steam cushion formula etc. of mainly containing.Because the intrinsic physical property of material and structure is limit, existing passive type vibration damper is unsatisfactory in the face of the low-frequency vibration effect of tens of Hz.Disturb particularly owing to the resonant frequency that is difficult to reduce them, thereby for the vibrations below the 20Hz, do not have damping effect substantially.

The model utility content:

The utility model purpose is for avoiding the deficiency of above-mentioned various passive type shock-dampening methods, provide a kind of with simple mode can realize, with low cost, not only can reduce the above vibrations of 20Hz and disturb, and can effectively reduce the magnetic vibration reducing device of the passive type damping of the following low-frequency vibration interference of 20Hz.

The utility model technical solution problem adopts following technological scheme.

Structural feature of the present utility model is to be oppositely arranged upper magnet and lower magnet by the same sex, between upper magnet and lower magnet, is formed with the air clearance that thickness changes with the variation of loading or vibrate with the repulsive force between magnet; Tubular shell is set, and two-part about described tubular shell split is set to longitudinally to relatively move are respectively top cover and base plate, and lower magnet is fixedly installed on the base plate, and upper magnet suspends and is fixed under the top cover.

The structural feature of the utility model magnetic vibration reducing device also is:

Described top cover and base plate are permeability magnetic material.

Upper magnet and lower magnet adopt neodymium iron boron magnetic body.

The physical phenomenon that the utility model utilizes the magnetic pole same sex to repel each other between upper magnet and lower magnet, produces an air clearance, and the size of this air gap can change with the variation of load or vibration.When vibration wave transmits, because the repulsive force between the like pole and the damping effect of air gap reach the effect that reduces shock transfer.

Use of the present utility model is the magnetic force of consumes energy not, utilizes the intrinsic excellent damping characteristic that is better than spring or rubber of air, has realized that no energy consumption, volume are little, simple installation, do not needed regular maintenance, reaches the effect that reduces vibration transmission better.

Compared with prior art, the utility model beneficial effect is embodied in:

1, the utility model can adopt ndfeb magnet, utilizes the strong characteristics of the little magnetic energy of its volume, sets up an air gap between the supporting surface of instrument and equipment that needs damping and instrument and equipment, and then reduces and isolate the transmission of vibrations.

2, the utility model utilizes the intrinsic excellent damping characteristic of air, makes the resonant frequency of vibration damper reduce, and resonance peak is mild, has improved the cushioning ability to low-frequency vibration, and after tested, resonant frequency can be hanged down 2Hz, can effectively isolate low-frequency vibration.

3, damping effect of the present utility model is two-way, both can be with reducing in the face of the vibration interference of instrument and equipment, also can reduce vibrations are arranged self equipment to ground and vibrations on every side.

4, compare with airmounts, the utility model does not in use consume any energy, and it is simple and compact for structure, and is easy for installation, does not need regular maintenance and adjustment.

5, the utility model can be widely used in and reduce extraneous vibration to precision instrument and equipment, as the interference of electron microscope, optical precision measurement etc.The vibrations that produce in the time of also can reducing simultaneously work such as equipment such as blower fan, pump are near the interference of other precision instrument and equipment on every side.

Description of drawings:

Fig. 1 is the utility model structural representation.

Fig. 2 is a vibration transmission characteristic curve of the present utility model.

Number in the figure: 1 upper magnet, 2 lower magnets, 3 air clearances, 4 tubular shells, 5 top covers, 6 base plates.

Below pass through embodiment, and in conjunction with the accompanying drawings the utility model be further described:

Embodiment:

Present embodiment is the repulsive force that repels each other with the same sex between the magnetic pole and is formed on air clearance between the like pole and produces damping effect and realize vibration damping.

Referring to Fig. 1, be oppositely arranged upper magnet 1 and lower magnet 2 by the same sex, between upper magnet 1 and lower magnet 2, form the air clearance 3 that changes with the variation of loading or vibrate with the repulsive force between magnet.

As shown in Figure 1, in concrete the enforcement, tubular shell 4 is set, two-part about tubular shell 4 splits are set to longitudinally to relatively move, with the permeability magnetic material respectively top cover 5 and base plate 6, in tubular shell 4, lower magnet 2 is fixedly installed on the base plate 6, upper magnet 1 suspends and is fixed on top cover 5 times, and monnolithic case is oblate cylindricality, and this structural type is convenient to install, can keep the horizontal stability between upper magnet 1 and the lower magnet 2 to greatest extent, make the magnetic circuit closure simultaneously in case the leak-stopping magnetic disturbance, upper magnet 1 and lower magnet 2 adopt neodymium iron boron magnetic bodies, and the little magnetic of its volume is strong.

During actual the use, can constitute a vibration absorption unit with the upper magnet 1 and the lower magnet 2 of paired setting, a plurality of vibration absorption unit in a row or become the array parallel setting also can a plurality of vibration absorption unit series connection be provided with and use.

Fig. 2 has provided the actual test curve of vibration transmission characteristic of the present utility model, as can be seen from the figure, the resonant frequency of magnetic vibration reducing device only is 2 hertz, well below 20 to 50 hertz resonant frequency of all kinds of passive type vibration dampers, near 0.7 to 1 hertz resonant frequency of active vibration damper.Moreover, the vibration transmission decay of the utility model magnetic vibration reducing device in the time of 20 hertz is about 8 decibels, and such damping effect is that other various passive type vibration dampers are inaccessiable far away.

Claims

1, a kind of magnetic vibration reducing device, it is characterized in that being oppositely arranged upper magnet (1) and lower magnet (2) by the same sex, between described upper magnet (1) and lower magnet (2), be formed with the air clearance (3) that thickness changes with the variation of loading or vibrate with the repulsive force between magnet; Tubular shell (4) is set, two-part about described tubular shell (4) split is set to longitudinally to relatively move, be respectively top cover (5) and base plate (6), lower magnet (2) is fixedly installed on the base plate (6), and upper magnet (1) suspends and is fixed under the top cover (5).

2, magnetic vibration reducing device according to claim 1 is characterized in that described top cover (5) and base plate (6) are permeability magnetic material.

3, magnetic vibration reducing device according to claim 1 is characterized in that described upper magnet (1) and lower magnet (2) adopt neodymium iron boron magnetic body.

4, magnetic vibration reducing device according to claim 1 is characterized in that upper magnet (1) and the lower magnet (2) with paired setting constitutes a vibration absorption unit, and a plurality of vibration absorption unit are in a row or become the array parallel setting, or the series connection of a plurality of vibration absorption unit is provided with.