RU157094U1 - VIBRATION ISOLATING SUPPORT FOR SHIP DIESEL POWER ENGINEERING - Google Patents

Abstract

Vibration isolating support of a marine diesel power plant, containing a toroidal element elastic from a steel rope, wound in a spiral with a gap between internal adjacent half coils, plate-disks with grooves-openings in which the cable coils are placed and fixed, characterized in that: - the ratio of the diameter of the coil (or half-turn) Dpc to the diameter of the steel wire dt is - free run of the vibration isolator - the gap Δ between the inner adjacent half-turns, providing free run of the vibration isolator, is determined by uloygde- outer coil radius (or half turns), - the diameter of the rope; - the number of turns of the rope elastic element; - the diameter of the coil; - the free travel of the vibration isolator.

Description

The utility model relates to the vibration isolating supports of marine diesel power plants, and can also be used to protect against vibration, shock and shock of other objects of technology.

In addition to traditional rubber-metal vibration isolators (shock absorbers), toroidal cable (cable) vibration isolators are also used as vibration isolating supports for marine diesel power plants (SDEU). Known vibration isolating support according to the patent of the Russian Federation No. 2219395, class. F16F 7/14, 2003. containing a toroidal elastic element from one piece of a steel rope, wound in a spiral with a gap between the inner adjacent half-coils, planks-disks with grooves-openings in which the coils of the cable are placed and fixed.

The closest technical solution is a vibration isolating support according to the patent of the Russian Federation No. 2185540, class. F16F 7/14, 2002, adopted as a prototype, which differs from the above analogue in that the toroidal elastic element is made of two identical along the length of the parts of the steel rope, wound in a spiral in opposite directions. The gap in a circle between the inner adjacent half-turns of the torus is at least one millimeter when the vibration isolating support is under rated load.

A significant disadvantage of the known vibration isolating supports is the low efficiency of shockproof protection, both from the side of the SDEU and from the ship's foundation. The low efficiency of shockproof protection is explained by the fact that the gap between the inner adjacent half-turns is very limited, and the natural frequency is 20-30 Hz. They cannot provide the required free movement (75% of the rope or half-turn). That is, with a slight axial deformation, the coils are compressed, turning from a round shape to an ellipse shape. In this case, the gap between the inner adjacent half-turns disappears and the half-turns touch each other. The emphasis of adjacent half-turns thus prevents the free running of the upper movable bar, skipping a strike to the foundation (or vice versa, if the strike is transmitted from the ship's foundation). An important negative feature of the known vibration-isolating supports is that the index of elastic elements is a turn (or half-turn), i.e. the ratio of the diameter of a turn (or half-turn) to the diameter of a steel rope is less than 10, which reduces the survivability of the elastic element and, in general, the service life of the support itself.

The technical result of the utility model is to ensure high efficiency of protection against shock and concussion, both from the side of the SDEU and from the ship's foundation. The specified technical result provides increased efficiency and durability of the vibration isolating support with a service life of at least ten years.

This is achieved by the fact that in a vibration-isolating support containing a toroidal element elastic from a steel rope, wound in a spiral with a gap between internal adjacent half-coils, planks-disks with grooves-openings in which the coils of the cable are placed and fixed, according to the utility model:

- the ratio of the diameter of the coil (or half-turn) Dpc to the diameter of the steel rope dt of the elastic element is, i.e., the index of the elastic element Spc

- the free travel of the vibration isolator S is 75% of the diameter Dpc of a turn (or half-turn)

S = 0.75 Dpc;

- the gap Δ (in mm) between the inner adjacent half-turns, providing a free run S of the vibration isolator

,

,

where R _DH is the outer radius of the turn (or half-turn);

dt is the diameter of the rope;

i _in - the number of turns of the rope elastic element;

DPC - diameter of a turn or half-turn;

Cpc is the index of the elastic element;

S is the free travel of the vibration isolator;

Δ is the gap between the inner adjacent half-turns.

The technical solution is illustrated by the drawings shown in FIG. 1-3.

In FIG. 1 is a plan view, and FIG. 2 is a longitudinal section of a vibration isolating support.

In FIG. 3 shows the load characteristic. Line 1 - tangent on the graph, determining the stiffness (natural frequency) of the vibration isolator; 2 - plot of low rigidity (on the graph); 3 - maximum permissible movement (on the chart).

The vibration-isolating support contains a toroidal elastic element made of steel rope 1, wound in a spiral with a gap Δ between inner adjacent half-coils, plate-disks 2-5 with grooves-openings in which coils 6 and 7 of the steel cable are placed and fixed with fixing means.

As follows from the load characteristics of the toroidal cable vibration isolator (Fig. 3), their main properties are noted in two sections. In the initial section (the “vibration” section - small displacements), the vibration isolator has a sufficiently high rigidity. With increasing amplitude of the impact, the stiffness of the vibration isolator decreases, as a result of which its natural frequency decreases more and more. Under shock loading, the initial displacement is large (the “impact” section), therefore, the stiffness of the vibration isolator is small, and due to significant deformation, energy is absorbed. Determination of the gap Δ (in mm) between internal adjacent half-turns according to the proposed formula, provides a free travel of the vibration isolator equal to 0.75 Dpc. That is, regardless of the nature of the occurrence of shock or concussion, the calculated gap Δ provides free movement of the imaging support, and thereby effective protection against shock, followed by damping and damping of the oscillatory process, due to the structure of the steel rope. In addition, the choice of a coil index ranging from 10 to 20 provides not only effective protection against impacts, but also the survivability of the steel rope elastic element, and the service life of the support is 10 years or more.

Claims (1)

Vibration isolating support of a marine diesel power plant, containing a toroidal element elastic from a steel rope, wound in a spiral with a gap between internal adjacent half turns, planks-disks with grooves-openings in which the cable turns are fixed and fixed, characterized in that: - the ratio of the diameter of the coil (or half-turn) Dpc to the diameter of the steel rope dt is

- free running of the vibration isolator

- the gap Δ between the inner adjacent half-turns, providing free movement of the vibration isolator, is determined by the formula

Where

- the outer radius of the coil (or half-turn);

- rope diameter; -

- the number of turns of the rope elastic element;

- diameter of the coil;

- free running vibration isolator.

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