Fluid-operated shock absorber

FIELD: mechanical engineering.

SUBSTANCE: fluid-operated shock absorber comprises intermediate mass with flexible link made on high-pressure hoses. The intermediate mass is mounted on the high-pressure hoses connected with the vibration damper. The vibration damper has check valve and controlled throttle connected in parallel with the fluid accumulator.

EFFECT: expanded functional capabilities.

2 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, BI No. 48, 1979). 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.

Closest to the technical essence is a shock absorber for protection from vibrations of various objects (A.S. USSR №823703, F16F 15/04, BI, No. 15, 1981), 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 a cavity filled with a working medium, and an elastic element connecting the intermediate mass of the vibration damper. The intermediate mass is associated with the second hydraulic cylinder iduma pistons of different diameters, placed in the respective cylinders, 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.

The objective of the invention is improving the efficiency of damping impact load transmitted to the base object.

This object is achieved in that a hydropneumatic shock absorber contains intermediate mass with elastic coupling, mounted on the base and connected hydraulically with the vibration damper and hidropneumoacumulatorul. Moreover, the elastic connection is made from deformirovannykh in the radial direction of the high pressure hoses that are hydraulically connected to the vibration damper consisting of a parallel connected check valve and an adjustable throttle, and then with hidropneumoacumulatorul.

1 shows a hydropneumatic shock absorber, and figure 2 - scheme of work deformirovannogo in the radial direction of the high-pressure hoses.

Hydraulic shock absorber (1) is the C intermediate mass 1, moving in the guide 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, comprising parallel mounted check valve 6 and an adjustable orifice 7. The damper is connected with the fluid cavity hydropneumoaccumulator 8, and the gas passage chamber with a charging valve 9 and the safety valve 10.

Figure 2 presents the scheme of the deformation in the radial direction of the high-pressure hose 3, 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 8.

The device operates as follows.

Before starting a hydropneumatic shock absorber in hydropneumoaccumulator 8 through the charging device 9 sets the pressure P0and a relief valve configured to pressure Ptoexcess 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.

The force F0, which affect 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. Area And increases to the amount And1. The fluid from the cavities of the high pressure hose 3 through the pipeline 5, the non-return valve 6 and the choke 7 enters hydropneumoaccumulator 8, the system maintains the pressure P0because the compressibility of gas is many times greater than the compressibility of the liquid. Move the value of x1will increase as long as the value of amplitude values of the influencing effort F(t) is less than or equal to the force from the high pressure hoses, deformirovannykh in the radial direction P0A1≥F(t).

In the future force F(t) is removed, and the fluid hydropneumoaccumulator 8 through an adjustable orifice 7 is supplied into the cavity deformirovannykh high pressure hoses with a lesser rate. The energy impact from the efforts of F(t) is extinguished on the regulated throttle 7. Subsequent impacts efforts F(t) the process is repeated. The valve 10 pre which protects the absorber from overloads.

Variable area flow orifice 7 and the pressure P0in hydropneumoaccumulator 8 determines the effective frequency range of operation of the shock absorber, since the value of P0determines the stiffness of the elastic link, and the area of the throttle - the rate of energy absorption by the absorber. The use of high pressure hoses as elastic connection with different internal diameter allows the use of a shock absorber in a wide range of operating loads.

A hydropneumatic shock absorber comprising the intermediate mass of the elastic link, installed on the base and connected with the vibration damper, characterized in that the elastic connection is made from deformed in the radial direction of high pressure hoses, and the vibration damper includes parallel connected check valve with an adjustable orifice and hydropneumoaccumulator.



 

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