Hydraulic-and-pneumatic damper with inertialess shock absorber

FIELD: mechanics.

SUBSTANCE: invention relates to machine building and is designed to absorb impact and vibration loads applied onto the base. The shock absorber incorporates an intermediate flexible-link weight arranged on the base and communicating with the damper representing a jet element with a cover and casing. The latter is furnished with tangential and axial channels, the latter communicating the aforesaid flexible link while the former communicates with the hydraulic-and-pneumatic accumulator.

EFFECT: higher damping efficiency.

4 dwg

 

The invention relates to the field of mechanical engineering for damping shock and vibration loads acting on the basis of the Foundation.

Known hydropneumatic cushion (A.S. USSR №706613, F16F 9/44, B. I. 1979, No. 48). The device includes a housing, placed in it a piston connected with the last hollow piston rod compensating chamber communicated with newportnews and podpornoy cavities, and fixed to the body element with a channel connecting nadporshnevaya and podporchennuyu cavity. The device also has an adjustable limiting valve installed in the channel, and a check valve mounted in the bore of the piston and connecting compensation and podporchennuyu cavity.

The main disadvantage is the lack of efficiency of the device when changing the level of acting shock.

Known shock absorber for protection from vibrations of various objects (A.S. USSR №823703, F16F 15/04, 1981 B. I. No. 15), which contains the intermediate mass, comprising a cylinder, connecting it with the object and basis of the elastic link, shock absorber, made in the form of a piston with an axial channel and placed in the cavity filled with the working environment and the elastic element connecting the intermediate mass of the vibration damper. The intermediate mass is associated with the second hydraulic cylinder and two pistons of different diameter is in, placed in the respective cylinders, over and podpisniye cavities which are connected by channels. When the piston of larger diameter is connected with the object and basis of elastic links, and the piston of smaller diameter through the elastic element with the quencher.

The main disadvantage is the relatively narrow frequency range damping due to the constancy of the ratios of the diameters of the pistons of the large and small cylinders and the same speed of movement of the piston in both directions.

Closest to the technical essence is gidropnevmoavtomatike absorber (Patent No. 2298122 from 30.11.2005), which contains the intermediate mass with elastic coupling, mounted on the base and connected hydraulically with the vibration damper and hidropneumoacumulatorul. The elastic connection is made from deformirovannykh in the radial direction of high pressure hoses, which are hydraulically connected with the vibration damper consisting of a parallel connected check valve and an adjustable throttle, and then with hidropneumoacumulatorul.

The main disadvantage is lack of frequency response due to moving mechanical elements included in the check valve.

The objective of the invention is improving the efficiency of damping impact load transmitted to the base object, by increasing the cha is tochnogo range.

This object is achieved in that a hydropneumatic shock absorber contains intermediate mass with elastic coupling, mounted on the base and connected hydraulically with a vibration damper made in the form of inkjet element, then hidropneumoacumulatorul. The elastic connection is made from deformirovannykh in the radial direction of the high pressure hoses that are hydraulically connected with the axial channel of the jet element, which through a tangential channel associated with hidropneumoacumulatorul.

1 shows a hydropneumatic shock absorber, figure 2 - scheme of work deformirovannogo in the radial direction of the high-pressure hoses, figure 3 - jet element, figure 4 - flow element in the context.

Hydraulic shock absorber in figure 1 consists of intermediate mass 1, moving in guides 2. Elastic connection 3 is installed between the intermediate mass 1 and the base 4. Cavity elastic ties 3 are made of high pressure hoses, filled with fluid and the pipe 5 is connected with a damper, consisting of a jet element 6. Gastel connected with liquid cavity hydropneumoaccumulator 7, and the gas passage chamber with a charging valve 8 and the safety valve 9.

Figure 2 presents the scheme of the deformation in the radial direction of the high-pressure hoses , having an initial inner diameter d, changing the value of x under the action of the weight of the object and intermediate mass 1. In the high pressure hoses 3 fluid pressure P0corresponds to the charging hydropneumoaccumulator 7.

Figure 3 and 4 shows the damper consisting of inkjet element, including the cover 10 and the housing 11 which is made tangential channel 12 and the axial channel 13.

The device operates as follows.

Before starting a hydropneumatic shock absorber in hydropneumoaccumulator 7 through the charger 8 sets the pressure P0. The same pressure P0will deformirovannykh the high pressure hose filled with liquid. High-pressure hoses deformiruyut on the value of x, and the area A, which supports the intermediate mass, will be

,

where L is the length of high pressure hose, interacting with intermediate mass 1 and the base 4.

External force F0that affects deformirovanie in the radial direction of the sleeve 3 onto the intermediate mass 1 is F0=P0A.

When exposed to F(t) of the object at the intermediate mass 1, the latter is moved in the guide rails 2 and deforms the high-pressure hose 3 the value of x1. The area A is increased to a value of A10because the compressibility of the gas in a lot more gas compressibility of the liquid. Move the value of x1will increase as long as the value of amplitude values of the influencing effort F(t) becomes less than or equal to the force from the high pressure hoses, deformirovannykh in the radial direction R0A1≥F(t).

In the future force F(t) is removed, and the fluid hydropneumoaccumulator 7 through a tangential channel 12 jet element 6 and the axial channel 13 flows into the cavity deformirovannykh high pressure hoses. The energy impact from the efforts of F(t) is extinguished on the jet element 6 due to the swirling flow of the liquid, thus creating resistance to flow. Subsequent impacts efforts F(t) the process is repeated. The valve 9 prevents the damper from overloads.

The use of jet element eliminates intermediate mass parts and increases the frequency range damping acting load.

A hydropneumatic shock absorber with instantaneous damper containing intermediate mass with elastic tie the Yu, mounted on the base and is hydraulically connected with a vibration damper, wherein the damper is made in the form of a jet element containing the cover, the case in which you have tangential and axial channels, and an axial channel associated with the elastic link, and tangential - hidropneumoacumulatorul.



 

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