RU38374U1 - COMBINED VIBRATION ISOLATOR - Google Patents

Description

2003137959

2; ooi13r 59

COMBINED VIBRATION ISOLATOR.

The invention relates to the field of vibration isolation of machine shafts, mechanisms and can be used to suppress vibration of units and assemblies in any industry. The preferred area of application is vibration suppression of fast rotors, rotors of power plants of transport systems.

A known damper, a ring-shaped housing filled with a working medium, a stir ring, a ring mounted therein, mounted on a non-rotating bearing race, and a corrugated plate package, characterized in that in order to increase efficiency, the damper housing and the ring have an H-shaped cross section and They are combined in such a way that the plate package is split between the inner wall of the ring and the inner wall of the housing, and the damper is equipped with an unloading device, including a support element and spring-loaded in the direction and the action of static force shoe interacting with the ring. AS, USSR No. 723252 IPC F16F 7/00 BI No. 11.1980.

This damper, in essence, is a combination of a plate corrugated dry friction damper and a viscous friction damper made in the form of a U-shaped annular gap between the vibrator and the body.

Its disadvantages include the complexity of the design and significant radial dimensions, so it has not found to date application in mass production. In addition, the damper has a complex design scheme and its selection for a specific engine is associated with a large amount of experimental research. Moreover.

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viscous friction damper (hydraulic) involves the use of a branched hydraulic system, which makes it (non-autonomous).

Known combined vibration isolator comprising a housing, a vibrator and a package of corrugated plates installed between the housing and the vibrator, a package of corrugated plates mounted on the vibrator, and an intermediate ring, the inner diameter of which is larger than the outer diameter of the vibrator, and the width is less than the width of the latter and interacts with the main package corrugated plates, and the gaps between the body and the packages are selected from the condition:

Amah.Uz + U2 U1 / 2

where Amah is the maximum working amplitude of the rotor vibration in the support;

U - the gap between the housing and an additional package of corrugated plates;

U2 - the gap between the body and the main package of corrugated plates;

US - the gap between the vibrator and the intermediate ring. AS, USSR №778399 IPC F16F 7/00 by Ponomarev Yu.Kh., Antipova V.A. and

This device has a wide range of perception of dynamic loads: at low strain amplitudes, the main package of plates works, and with an increase in load an additional package of plates comes into operation. However, the constructive implementation of the specified device is complex, since in fact two independent dampers and the overall dimensions of the support are twice as high as manufactured and installed in the rotor support. In addition, the entry into operation of the second package is accompanied by an abrupt change in stiffness, which is essentially a shock load for a vibroisolated object. In addition, only the main package of plates works at small amplitudes, and the additional package of plates actually stands idle and is included in

work only under heavy loads. Therefore, the efficiency of vibration suppression at small amplitudes is less than it could be.

This technical solution is selected by the authors as a prototype.

The technical result is to expand the range of perceived loads while providing a soft, unstressed characteristics of the support, and simplification of the design, as well as high efficiency of vibration suppression in all modes of operation of a power plant.

The technical result is achieved by the fact that an elastic hysteresis cable element is additionally installed in the combined vibration isolator, made in the form of a zig-shaped, endless, twisted into a ring and bent cable strand that is hollow from the inside or filled with a hemp base. An elastic hysteresis element is placed between the cylindrical pockets, which, in turn, are made in the inner ring from its outer side and the hollows of the corrugations of the package of corrugated plates.

The fundamental difference in the design is the high efficiency of vibration suppression in all vibration isolator operation modes.

Sush; the invention is illustrated by drawings, where in Fig. 1 shows a cross-section of a vibration isolator, in FIG. 2 is a plan view of a deployed cable strand.

The combined vibration isolator includes an outer 1 and an inner 2 rings, a packet of 3 corrugated plates placed between them and an endless zig-shaped cable strand 4, hollow from the inside or filled with a hemp base 5 and placed between pockets 6 and hollows of the corrugations of packet 3.

The combined vibration isolator is located between the bearing 7 mounted on the vibration mount 8 (EU rotor) and the bearing housing 9.

Between the vertices of the corrugations of the packet 3 and the inner ring 2, a gap b is made.

The operation of the combined vibration isolator is drained: as follows.

The vibrational or shock load of small amplitude values coming from the vibrating object leads to a change in the step of the waves of the corrugations (corrugations "move away from the center to the periphery). In this case, the cable elements are deformed, the plates slip over the surface of the cables and the energy of vibration or shock is dissipated due to the work of friction forces inside the rotor. In addition, under the influence of vibrational load, elastic deformation of the cable rings occurs. In this case, the wire rope slips one relative to the other and the energy is dissipated due to the work of the dry friction forces in the rope elastic elements. The specified elastic deformation of the cable rings is predetermined by the presence of a gap b (see Fig. 1)

When exposed to large amplitude values of the vibration load or the occurrence of shock load, the corrugations sit on the inner ring 2 of the vibration isolator. The stiffness of the package increases and additional energy is dissipated at the contact points of the corrugations and the outer side of the inner ring 2.

Thus, the vibration isolator is effective in all operating modes.

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Claims (1)

A combined vibration isolator consisting of a package of corrugated plates, an outer and inner ring and an elastic hysteresis cable element, characterized in that the elastic hysteresis element is made in the form of a zig-shaped, endless, twisted cable strand twisted into a ring, and the strand is hollow from the inside or filled with hemp between cylindrical pockets, which, in turn, are made in the inner ring from the side of the package of corrugated plates, and the hollows of the corrugations of the package.