CN2042532U

CN2042532U - Liquid-air spring vibration-damper

Info

Publication number: CN2042532U
Application number: CN 88217614
Authority: CN
Inventors: 胡年丰
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 1988-10-16
Filing date: 1988-10-16
Publication date: 1989-08-09

Abstract

The utility model discloses a liquid-air spring vibration isolating device, which is used for the basic vibration isolation and the buffering of the engineering machinery and the facility. The lower end of the liquid-air spring vibration isolating device including an oil cylinder is provided with an air intake valve which is communicated with the airbag in the oil cylinder; the upper end is connected with a sealing guiding device through a connecting element, and the inner part of the oil cylinder is provided with a through-flow clearance adjusting mechanism which is connected with the outside through a guiding rod and an adjusting valve rod. The outside vibration and the impact interference force can be transmitted to the sealing oil liquid through the liquid-air spring vibration isolating device; the converted hydraulic pressure can be absorbed by the airbag; the vibrating transmitting rate can be lowered, and the peak value response can be reduced. The liquid-air spring vibration isolating device which has large bearing ability is suitable to be the basic support in the fields, such as the machinery, the engineering, the motive power engineering, etc., and the liquid-air spring vibration isolating device has remarkable isolating effect, specially on the low-frequency interference.

Description

Liquid-air spring vibration-damper

A kind of fluid power air cushion shock absorber is used for the vibration of engineering equipment and facility and impacts isolation.

As vibration isolation element, require energy free adjusting optimal damping under different situations, with the power amplification factor of reduction system under the resonance situation, make system safety operation.For the isolation effect that improves vibration and impact, wish to reduce as far as possible the resonant frequency of system, especially for many large-scale low frequency operation machineries or seismic interference ripple, this requirement is more outstanding.

At present existing in (subtracting) shakes product, be good with the low frequency characteristic of pneumatic spring and metal steel wire, but its technology and usability are still relatively poor.Pneumatic spring requires reliable sealing, and also very high to the requirement of strength of air bag, and manufacture difficulty is quite big; The wire spring volume is big, will join damped part in addition during use, just effect preferably can be arranged, and this uses to as installed has increased very big difficulty.

The purpose of this utility model be to provide a kind of both possessed the favorable manufacturability energy is arranged, can conveniently use again, under different condition, can make vibrating isolation system reach the fluid power air cushion shock absorber of best using effect, for engineering fields such as machinery, chemical industry, power, building provide desirable basic anti-vibration and shock product.

The utility model is realized by following measures:

The suction valve of oil cylinder one end of pressurized air by having pressure oil enters the air bag that is immersed in the fluid, the air bag volumetric expansion.No external loading is done the time spent, fills the gas of certain state in the air bag.It all is in the internal and external pressure balance state at any time.Under the initial volume and pressure of gas, vibration isolation will possess certain intrinsic behavioral characteristics in given air bag.The change original state can change system dynamics, and therefore different original states is applicable to different vibrations or impact system.Can select different original states as required.

The other end at oil cylinder connects oil cylinder and sealing guiding device by connecting element, in oil cylinder, also be provided with the gap damper regulation mechanism, link to each other with the external world by the sealing guiding device, produce under vibration or the impact condition at equipment, perturbed force passes to pressure oil by this mechanism and changes the hydraulic pressure energy into, absorbed by air bag, air bag gaseous state under the effect of variation oil pressure changes again; Simultaneously oily ebb interval produces the pressure loss, consumes the hydraulic pressure energy, reduces vibration and shock response level to reach.

Load one inflection curves of the present utility model is a nonlinear characteristic, in quite wide loading range, system has essentially identical resonant frequency and using effect, therefore this non-linear low frequency fluid power air cushion shock absorber helps the varying load system, the adjustable damping characteristic that has, to the different system different situations, but the people is for being adjusted to optimal damping, the isolation effect of raising system to vibrating or impacting.

The utility model describes in detail embodiment below in conjunction with accompanying drawing:

Fig. 1 is the plan view of the utility model fluid power air cushion shock absorber;

Fig. 2 is another embodiment's plan view of the present utility model;

Fig. 3 is the utility model cone valve plan view;

Fig. 4 is the utility model piston master, plan view.

With reference to accompanying drawing 1 or 2, the utility model comprises: oil cylinder, suction valve, air bag, piston, cone valve, guide rod, regulating valve stem, V-shaped seal ring, flange, gland and screw etc.Pressurized air has pressure oil by being fixed on, and for example the oil cylinder 1 of 20# or 30# multiviscosisty hydraulic oil or the suction port 2 of bottom inflow valve enter air bag 4 through pressure bladder joint 3; airbag inflation; under given initial volume and pressure condition, vibration isolator possesses certain intrinsic behavioral characteristics

Select different original states for use according to actual conditions.Because the outer oil pressure of air pressure in the air bag 4 and capsule is a neutral equilibrium, so air bag 4 need not too high intensity, this has just reduced the requirement of 4 pairs of strengths of materials of air bag and sealing greatly, and manufacturing process can be simplified, for example air bag 4 can be made through pressure injection by nitrile rubber, and end connection has metal tieing 3.That air bag 4 shapes can be is corrugated, sphere or garden cylindricality.According to the different needs in the engineering use, can change in the air bag 4 by suction valve easily and press.For example suction valve mainly constitutes breather cheek valve by valve body 27, valve seat 28, spool 29, spring 30 and seal ring (22,23,24) etc., surface of contact adopts rubber seal, with block 31 and seal ring 25 the whole suction valve and the external world are separated, guarantee gas and fluid sealing in the air bag 4.31 available metal materials or the nonmetallic material of blocking a shot are made.The oil cylinder profile can be Cylinder, can adopt cold stamping.Welding or cast form process from strand again.The other end of oil cylinder 1 is for example linked to each other with the sealing guiding device with screw by connecting element, and it is made of flange 14, V-shaped seal ring 15, supporting ring 16, gland 17, metal washer 18 and screw etc.The appropriate gland 17 of regulating can improve sealing effect.

With reference to accompanying drawing 3 to 4, also be provided with the gap damper regulation mechanism at oil cylinder 1 internal upper part, for example constitute by piston 6, cone valve 12, regulating valve stem 11 and guide rod 7.Plant bottom case 10 by connecting element for example packing ring 8 be connected with guide rod 7 with nut 9, guide rod 7 lower ends drive piston 6 and do axial motion in oil cylinders 1, piston 6 and oil cylinder 1 are for movingly.Piston 6 moves down, oil pressure raises in the oil cylinder, presses simultaneously in the air bag 4 to raise, and volume reduces, reach new state of equilibrium until system, the airtight quality that O RunddichtringO 21 on the regulating valve stem 11 and suction valve inner seal ring etc. are located plays a decisive role to the stability and the reliability of this balance.Regulating valve stem 11 can regulating piston 6 and cone valve 12 between gap 13, piston 6 upper and lower fluid communicate via approach such as gap 13, holes 26, control flow passage resistance by regulating flow area and through-flow length.For example regulate the size in regulating valve stem 11 change gaps 13, and then change oil flow resistance loss, cause oil stream local pressure loss consumption, becoming heat energy dissipates by fluid and cylinder body, make the resonance peak response of vibrating isolation system be constrained to the degree that needs, this is the optimal damping adjustment process.Can not change for a long time after adjusting.

Therefore, when extraneous vibration or impact generation,, absorb in a large number, change the kinergety that gap length has consumed system effectively simultaneously, so desirable vibration, the impact isolation effect of acquisition by air bag 4 owing to the energy that vibrates or impact generation is transformed into the hydraulic pressure energy.

In the passive vibration isolation system, vibration source imports cylinder body from the basis into by attachment bolt 19, and the energy that vibration source imports into is absorbed by vibration isolator and consumes, and has protected the safe handling of equipment effectively.

The utility model compared with prior art has significant advantage and effect:

Vibrating isolation system has low harmonic motion rate and variable damping characteristic, and the minimum 1H2 that reaches is applicable to the foundation support in the low frequency situation; For different system or different situations, can artificially regulate flexibly best damping state, raising system vibration isolation effect is applicable to the varying load system; Bearing capacity is bigger, can reach more than 5000 kilograms, therefore also is applicable to the basic anti-vibration and shock of big machinery; Air capsule manufacturing process is simple; Use and maintenance is convenient. Can use Generator Set, diesel engine unit, press, test platform, accurate big machinery and bridge etc.

Claims

1, a kind of fluid power air cushion shock absorber that constitutes by housing, end cap, Sealing, air bag and screw, it is characterized in that described housing is the oil cylinder that has pressure oil, one end is provided with the suction valve that communicates with air bag in the oil cylinder, the other end is connected with the sealing guiding device by connecting element, in oil cylinder, also be provided with oily ebb interval controlling mechanism, link to each other with the external world by the sealing guiding device, the interference power that extraneous vibration or impact produce is absorbed by the fluid power air cushion shock absorber and consumes.

2, by the said vibration isolator of claim 1, it is characterized in that described oil cylinder profile can be Cylinder, can process from strand with cold stamping welding or cast form again.

3, by the said vibration isolator of claim 1, it is characterized in that described air bag made by nitrile rubber, end connection has the metal tieing, and external shape is corrugated, sphere or garden cylindricality.

4, by the said vibration isolator of claim 1, it is characterized in that described oily ebb interval controlling mechanism is made of piston, cone valve, guide rod and regulating valve stem.

5, by claim 1 or 2 said vibration isolators, it is characterized in that the pressure oil of filling in advance in the described oil cylinder is 20# or 30# multiviscosisty hydraulic oil.

6, by the said vibration isolator of claim 1, it is characterized in that described suction valve constitutes breather cheek valve by spring, spool, valve seat, valve body etc., all junction planes of suction valve all adopt rubber seal, and are outside with blocking a shot the suction valve integral sealing.

7, by the said vibration isolator of claim 1, it is characterized in that the v-seal guiding device of described sealing guiding device for the band supporting ring, there is the adjusting gland outside.